DCL-2021-514, NPDES Receiving Water Monitoring Program: 2020 Annual Report

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NPDES Receiving Water Monitoring Program: 2020 Annual Report
ML21146A171
Person / Time
Site: Diablo Canyon  Pacific Gas & Electric icon.png
Issue date: 04/27/2021
From:
Tenera Environmental Services
To:
Office of Nuclear Reactor Regulation, Pacific Gas & Electric Co
References
DCL-2021-514 ESLO2021-02
Download: ML21146A171 (138)
v • d • e


Text

Pacific Gas and Electric Company Diab/a Canyon Power Plant NPDES RECEIVING WATER MONITORING PROGRAM: 2020 ANNUAL REPORT April 27, 2021 ESLO2021-02 Submitted to: Prepared by:

Pacific Gas and Electric Company Tenera Environmental Diablo Canyon Power Plant 141 Suburban Road , Suite A2 Avila Beach, CA 93424 San Luis Obispo , CA 93401 Phone: 805.541.0310 FAX: 805 .541 .0421

Table of Contents Table of Contents 1 TABLE OF CONTENTS ............................................................................................................ II TABLE OF FIGURES ................................................................................................................ III TABLE OF TABLES .................................................................................................................. IV

1.0 INTRODUCTION

.......................................................................................................... 1-1 2.0 TEMPERATURE MONITORING .............................................................................. 2-1 3.0 INTERTIDAL ALGAE AND INVERTEBRATES .................................................... 3-1 4.0 INTERTIDAL FISHES ................................................................................................. 4-1 5.0 SUBTIDAL ALGAE AND INVERTEBRATES ......................................................... 5-1 6.0 SURFACE CANOPY KELPS ...................................................................................... 6-1 7.0 SUBTIDAL FISHES ...................................................................................................... 7-1 8.0 PROJECT PERSONNEL ............................................................................................. 8-1 9.0 LITERATURE CITED ................................................................................................. 9-1 APPENDIX A. Intertidal Temperatures APPENDIX B. Subtidal Temperatures APPENDIX C. Intertidal Algae, Invertebrates and Substrates (HBT Method)

APPENDIX D. Intertidal Fishes (VBT Method)

APPENDIX E. Subtidal Algae and Invertebrates (SAQ Method)

APPENDIX F. Subtidal Algae (SLC Method)

APPENDIX G. Subtidal Invertebrates (SFQ Method)

APPENDIX H. Subtidal Fishes (SFO Method)

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  • DCPP-RWMP 2020 Annual Report ii

Table of Figures Table of Figures Figure 1. Location of the Diab lo Canyon Power Plant. ..... ............ ........... ........ ...................... .... 1-1 Figure 2. Locations of intertidal temperature monitoring stations .... .......... .. ... .... .. .. .... ... ...... .. .... 2-1 Figure 3. Locations of subtidal temperature monitoring stations . ........... .......... ....................... .. 2-2 Figure 4. Seawater temperatures in 2020 recorded in contro l areas, South Diablo Cove, North Diablo Cove, and Field 's Cove for: a) intertidal ; and b) subtidal. Mean, max imum, and minimum temperatures are shown by month for each area (see text for temperature recording stations used in this figure) .... ......... .... .......... ............... .... .. ... ....... ...................... 2-4 Figure 5. DCPP 2020 average daily intake and discharge seawater temperatures ( 0 C), and dai ly cooling water discharge vo lume (MGD) ......... ..... ....... .. ................. ........... .... ............ 2-5 Figure 6. Locations of horizo ntal band transect stations . .............................. ........... ............ ...... 3-1 Figure 7. Locations of vertical band transect stations for sampling intertidal fishes .. ... .... ....... ..4-1 Figure 8. Locations of subtidal benthic stations .... .. .. ........ ... ............. ......................................... 5-1 Figure 9. Map of surface kelp in Diab lo Cove based on visual inspection from the shore on October 28, 2020 ........ .... .... ........ ........... .... ........................................................................ . 6-1 Figure 10. Locations of subtidal fish observation transects ........... ...................... .. ....... ............ .. 7-1

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Table of Tables Table of Tables Table 1. Tasks, stations, and frequency of surveys for the DCPP RWMP, 2020. (See text for sampling method descriptions and station locations) .......... .. ........................... ............. ... .. 1-2

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1.0: Introduction 1.0 Introduction The Diablo Canyon Power Plant (DCPP) is a nuclear power plant located on the central coast of California between Avila Beach and Morro Bay (Figure 1). The faci lity uses seawater from the Pacific Ocean for cooling. The seawater enters the plant through a shoreline intake structure in the Intake Cove and is discharged via a shoreline outfall in Diablo Cove. Monitoring of the marine environment near the Diablo Canyon Power Plant (DCPP) is required by WDR Order No. 90-09 (National Pollutant Discharge Elimination System (NPDES) Permit No. CA0003751),

as revised in a letter from the Central Coast Regional Water Quality Control Board in December 1998. The monitoring is completed by the Receiving Water Monitoring Program (RWMP) in accordance with the NPDES Permit.

(North Control is located 1.7 km north of Field"* Cova) 3'"25"0'"N Estero Bay 36"20V"N Point Olablo Canyon Buchon Power Plant OIABLO CANYON POWER PLANT Point Pacific Ocean San Luis Js*s,rN _:.c:**:::1*- 'c*::=j\5. Kilometers 0

11111 Figure 1. Location of the Diablo Canyon Power Plant.

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1.0: Introduction This report presents the seawater temperature and biological data collected for the 2020 reporting period from the RWMP intertidal and subtidal monitoring tasks (Table 1). The sampling methods for each task are described in the report, and summary statistics from the 2020 sampling are presented in the report appendices.

Table 1. Tasks, stations, and frequency of surveys for the DCPP RWMP, 2020. (See text for sampling method descriptions and station locations).

Task and Sampling Frequency Stations Temperature Monitoring Intertidal (recorded every 20 min) NC 2, FC 1, FC 2, FC 3, NDC 1, NDC 2, NDC 3, SDC 1, SDC 2, SDC 3, SDP 1, SDP 2, SC 1, and SC 1-V Subtidal (recorded every 20 min) NC 1 -3m, FC 1 -3m, NDC 2 -3m, NDC 3 -3m, NDC 4 -4m, SDC 1 -3m, SDC 4 -4m, SC 1 -3m, and SC 2 -6m Intertidal Horizontal Band Transects (algae, seagrasses, invertebrates, substrate) 4 surveys per year NC 1, NC 2, FC 1, FC 2, FC 3, NDC 1, NOC 2, NOC 3, SOC 1, SOC 2, SOC 3, SDP 1, SOP 2, and SC 1 Intertidal Vertical Band Transects (fishes) 4 surveys per year NC 1V, FC 1V, NOC 1V, SOC 2V, and SC 1V Subtidal Benthic Stations (alaae, invertebrates, substrate) 4 surveys per year FC 1 -3m, NOC 2 -3m, NDC 3 -3m, NOC 4 -4m, SOC 2 -3m, SOC 3 -4m, SC 1 -3m, and SC 2 -6m Subtidal Fish Observations (fishes) 4 surveys per year FC F0-1, FC F0-2, FC F0-3, NOC F0-1, NOC F0-2, NOC F0-3, SOC F0-1 ,

SDC F0-2, SOC F0-3; SC F0-1, SC F0-2, and SC F0-3 Habitat-Forming Kelp Survev (bull kelp, giant kelp) 1 survey per year Oiablo Cove Intertidal and subtidal stations included in the RWMP are located in six areas; South Diablo Cove (SDC), North Diablo Cove (NDC), South Diablo Point (SDP), Fields Cove (FC), South Control (SC), and North Control (NC). Two sites (SC and NC) are sufficiently far from the plant that they do not experience increased seawater temperatures due to the discharge.

The timing of sampling was completed during 2020 in accordance with the NPDES permit.

Habitat-forming kelp surveys were conducted once in 2020. Sampling for the remaining five tasks in Table 1 occurred during four discrete time-periods (surveys) in 2020. The specific date a station was sampled within each survey was influenced by logistics, staffing resources, weather, sea state, and tide conditions. The survey date of each task listed in the appendix tables represents the mean date for the time period within which the task was completed.

All monitoring tasks and surveys were completed in the 2020 reporting period . This report does not include analysis or discussion of the results of the biological and temperature monitoring.

Comprehensive analyses of changes in the marine environment resulting from the DCPP discharge have been presented in Tenera (1988, 1997, 1999a, 19996, and 2002).

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  • DCPP-RWMP 2020 Annual Report 1-2

2.0 Temperature Monitoring 2.0 Temperature Monitoring Intertidal and subtidal seawater temperatures were recorded at permanent stations located along the Diablo Canyon coastline. Temperature units at the intertidal stations shown in Figure 2 were located along the rocky shore at the +0 .6 m (+2.0 ft) mean lower low water (MLL W) elevation.

The temperature recorders at the subtidal locations shown in Figure 3 were located at depths of -3 m, -4 m, or -6 m (-10 ft, -13 ft, or -20 ft) MLL W. The naming designation for each station reflects the area location and station number. The station depth is indicated for the subtidal stations e.g., NDC 1 -3 m is North Diablo Cove subtidal Station 1 at a depth of -3 m (-10 ft)

MLL W (see Table 1).

Point San Luis 0 2.5 5

- - ,Kilometers DIABLO CANYON POWER PLANT Figure 2. Locations of intertidal temperature monitoring stations.

There were 13 stations in Diablo Cove regularly contacted by the discharge plume:

Intertidal: NDC 1, NDC 2, NDC 3, SDC 1, SDC 2, SDC 3, SDP 1, and SDP 2.

Subtidal: NDC 2 -3m, NDC 3 -3m, NDC 4 -4m, SDC 1 -3m, and SDC 4 -4m.

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2.0 Temperature Monitoring There were four stations in Field's Cove, approximately one kilometer upcoast from Diablo Cove, contacted intermittently by the discharge plume:

Intertidal: FC 1, FC 2, and FC 3.

Subtidal: FC 1 -3m.

There were six control stations outside the influence of the discharge, which measured ambient ocean temperatures:

Intertidal: NC 2, SC 1, and SC 1V Subtidal: NC 1 -3m, SC 1 -3m, and SC 2 -6m The intertidal stations in South Control (SC 1) and Stillwater Cove (SC 1V) use the same acronym but are located in different locations as shown in Figure 2.

Point San Luis 0 2.5 5

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  • DCPP-RWMP 2020 Annual Report 2-2

2.0 Temperature Monitoring Each temperature instrument synchronously logged temperatures every 20 minutes throughout its deployment period. Instrument precision was 0.025 °C with an accuracy of+/- 0.05 °C.

Temperature units were deployed at a station for approximately 60-90 days and then exchanged with a serviced, calibrated unit. Data from the intertidal temperature units were deleted prior to analysis when tide levels were less than the height of the sensors (+0 .6 m [+2.0 ft] MLLW). Tide levels were determined using data from NOAA tide gauges at Morro Bay and Port San Luis.

Monthly statistics on the seawater temperatures recorded at the intertidal and subtidal temperature monitoring stations in 2020 are presented in Appendix A and Appendix B, respectively. Below is a summary of seawater temperatures recorded in 2020, based on data from temperature recording stations in the control areas, North Diablo Cove, South Diablo Cove, and Field' s Cove.

Based on mean monthly temperature data, seawater temperatures throughout the study area are generally coolest from February through May and warmest from August through November.

Measured seawater temperatures are coolest in the control areas, and warmest in Diab lo Cove.

Intertidal monthly mean, maximum, and minimum temperatures recorded in 2020 in North Control (NC 2), South Diablo Cove (SDC 2), North Diablo Cove (NDC 2), and F ield ' s Cove (FC

2) are shown in Figure 4a. Monthly mean ambient seawater temperatures at the North Control station ranged from a low of 12.l °C (53 .8°F) in December to a high of 15.0°C (59.0°F) in October. Compared to the control station, intertidal seawater temperatures averaged 2.7°C (4 .9°F) warmer in South Diablo Cove and 3.7°C (6.7°F) warmer in North Diablo Cove. Intertidal seawater temperatures at the Field's Cove station were 1.1 °C (2.0°F) warmer than the control station, on average.

Subtidal monthly mean, maximum, and minimum temperatures recorded in 2020 at -3 m MLL W in South Diablo Cove (SDC 1 -3m), North Diablo Cove (NDC 2 -3m), and Field's Cove (FC 1 -

3m) are shown in Figure 4b. The subtidal control temperature data normally used for comparison with temperatures from areas affected by the discharge are based on data from the South Control (SC 1 -3m) station. However, a temperature unit deployed at that station malfunctioned during a deployment and data were not recoverable from June 3 at 11 :00AM PST through August 25 at 10:20AM PST. The subtidal control station temperatures presented in this figure were calculated by averaging available values recorded at the South Control (SC 1 -3m) station with those from the North Control (NC 1 -3m) station. A summary of these computed values is included in Table B6. Monthly mean ambient seawater temperatures using data from tht;t two control stations ranged from a low of l l.9°C (53.4°F) in Apri l to a high of 14.9°C (58.8°F) in October. Subtidal temperatures are usually warmest at the Diablo Cove stations in summer to early fall. Compared to the data from the control stations, subtidal temperatures averaged 2.1 °C (3 .8°F) warmer in South Diablo Cove and 3.8°C (6.8°F) warmer in North Diablo Cove. Subtidal temperatures at the Field ' s Cove station were l.2°C (2.1 °F) warmer on average than the data from the control stations.

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2.0 Temperature Monitoring a) Intertidal Temperatures 70 21

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,, ,*:' 49 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan 2020 Control 0 South Diablo Cove D Nonh Diablo Cove D Fields Cove Figure 4. Seawater temperatures in 2020 recorded in control areas, South Diablo Cove, North Diablo Cove, and Field ' s Cove for: a) intertidal ; and b) subtidal. Mean, maximum, and minimum temperatures are shown by month for each area (see text for temperature recording stations used in this figure).

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  • DCPP-RWMP 2020 Annual Report 2-4

2.0 Temperature Monitoring DCPP typically operates at fu ll capacity, however there were multiple periods in 2020 when one, two, and up to three of the four main circulating water pumps (CWPs) were not in service due to scheduled or emergent unit outages and curtai lments. This resulted in lower daily discharge volumes . The effects of six outages or curtailments during 2020 on daily discharge volumes can be seen in Figure 5. A brief description of each CWP outage or curtailment period is listed below.

  • February 13-16, 2020: Emergent Unit 2 forced outage. One Unit 2 CWP removed from service.
  • May 07 - 11 , 2020: Scheduled Unit 1 mid-cycle curtailment to clean biofouling growth from circulating water tunnels. One Unit 1 CWP removed from service.
  • July 17 -August 02, 2020 : Emergent Unit 2 forced outage. One Unit 2 CWP removed from service.
  • October 03 - November 04, 2020: Scheduled Unit 1 refueling outage (1R22). Two Unit 1 CWPs removed from service.
  • October 16 - November 11 , 2020: Emergent Unit 2 forced outage. One Unit 2 CWP removed from service.
  • December 02 - 04 & December 07 - 09, 2020: Scheduled Unit 2 cleaning of biofouling growth from circulating water tunnels. One Unit 2 CWP removed from serv ice.

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- Daily Discharge Volume 0-'-- . - - - - , - - . . - - ~- - . . . . - - . . - - - - , - - - + - -- r - - ~ - - + - - - - , , - - ~ - ' - o Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Jan 2020 Figure 5. DCPP 2020 average daily intake and discharge seawater temperatures (°C), and daily cooling water discharge volume (MGD).

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3.0 Intertidal Algae and Invertebrates 3.0 Intertidal Algae and Invertebrates Intertidal algae, seagrasses, and invertebrates were sampled using the horizontal band transect (HBT) sampling method at the locations shown in Figure 6 . Most HBT stations consisted of two 30 m long transects oriented parallel to the waterline, one at the +0.9 m (+3 ft) MLL W tide level and the other at the +0.3 m (+ 1 ft) MLL W tide level. Stations SDP 1 and SDP 2 each consisted of one transect at the +0.9 m (+3 ft) tide leve l. The substrate at the +0.9 m (+3 ft) MLLW level at station SDC 1 was mainly uncolonized cobb le. Therefore, the upper transect at that station was located at a lower elevation at the +0.6 m (+2 ft) MLL W tide level on bedrock where intertidal species were more abundant. The sampl ing area of each transect consisted of ten 1.0 m2 (10.8 ft2) permanent qu adrats. The quadrats were mai nly located on bedrock and boulders, but various amounts of cobble and sand that occurred seasonall y were also sampled. Data from temperature sensors indicate that three control stations were located outside the influence of the DCPP thermal discharge, while the remaining 11 stations in Field's Cove, Diablo Cove, and on South Diablo Point (south headland of Diablo Cove) had varying levels of contact with the warm water from the discharge.

Point San Luis 0 25 5

- - 1Kllometers DIABLO CANYON POWER PLANT Figure 6. Locations of horizontal band transect stations.

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3.0 Intertidal Algae and Invertebrates Percent cover for each algal and seagrass species was estimated visually. Coverage of overstory species were estimated first, and then the overstory branches and blades were moved aside to allow estimation of coverage for each understory species. Coverage of bare substrate was also recorded at this stage. Species that occupied less than 0.7% of the area of the quadrat were recorded as "present". Due to the overlapping layers of taxa, the total percent cover typically exceeded 100% in a quadrat.

The number of large mobile invertebrates (greater than 2.5 cm [l in] , largest dimension) were counted in each of the ten quadrats for each transect. In five of the ten station quadrats ("count" quadrats), select species of invertebrates were counted regardless of size. Species smaller than 2.5 cm (1 in.) not part of the select group were recorded as "present". The percent cover of sessile invertebrates, such as sponges and tunicates, was estimated using the same methods used for the intertidal algae. A ll black abalone, regardless of size, were counted in the ten permanent quadrats on each transect. In addition, black abalone in five additional quadrats on each transect that were previously sampled as part of the monitoring program were also counted.

The survey mean abundance or percentage cover, and the annual mean and standard deviation for each taxon at each transect level are presented in Appendix C. Survey means for algae and substrates were calculated from all ten quadrats along the transect, while the means for invertebrates were calculated from the five count quadrats. Before calculating the summary statistics in the appendices, taxa that were recorded as "present" in a quadrat were assigned a value of 0.01 if recorded as percent cover and a value of 1 if recorded as a count.

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4.0 Intertidal Fishes 4.0 Intertidal Fishes Intertidal fishes were sampled using the Vertical Band Transect (VBT) sampl ing method. At each of five stations (Figure 7), either two or three transects were positioned perpendicular to the shoreline at fixed locations. Each transect originated in the high intertidal zone (approximately

+1.5 m [4.9 ft] MLL W) and terminated in the low intertidal zone (approximately -0 .2 m [0.6 ft]

MLL W) . Transects at each station were separated by approximately 3 m (9 .8 ft). Each transect was used as a reference line to position twelve 1.0 m2 (I 0.8 ft2) permanent sampling quadrats, for a total of thirty-six quadrats per station. Two control stations were located beyond the influence of the DCPP thermal discharge, whi le the remaining three stations in Field ' s Cove and Diab lo Cove had varying levels of contact with the warm water from the discharge.

Point San Luis 0 2.5 5

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..-..--= 2-V Figure 7. Locations of vertical band transect stations for sampling intertidal fishes .

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4.0 Intertidal Fishes Intertidal fishes were sampled within quadrats by lifting any moveable rocks and searching foliose algae. Fishes were captured in small hand nets, identified to the lowest practical taxonomic level, measured, and returned to the quadrat following sampling. Newly settled juvenile fishes were not identified to the species level but were grouped into composite taxa. The survey total, annual mean, and standard deviation for each taxon encountered at each station are presented in Appendix D.

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5.0: Subtidal Algae and Invertebrates 5.0 Subtidal Algae and Invertebrates Eight permanent subtidal benthic sampling stations are located in depths of -3 m, -4 m, or -6 m (-

10 ft, -13 ft, or -20 ft) MLL W (Figure 8). Two control stations are located in Patton Cove, beyond the influence of the DCPP thermal discharge, while the remaining six stations had varying levels of contact with the warm water from the discharge. Stations were circular with a radius of 3.15 m (10.33 ft) , and a sampling area of28.0 m 2 (301.4 ft 2). The center 3.1 m 2 (33.4 ft2) of each station nearest to a mooring anchor (railcar wheel) was not sampled in order to avoid any unnatural algal and invertebrate growth associated with the mooring. Each station was divided into four equal sections, or "arc quadrants", 7.0 m 2 (75.3 ft2) in area. All stations were established primarily on substrates of mixed bedrock and boulders with varying amounts of cobble and sand.

Point San Luis 0 2.5 5

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-3m Figure 8. Locations of subtidal benthic stations.

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5.0: Subtidal Algae and Invertebrates Divers used three sampling methods at each station to sample the benthic algae and invertebrates. The first sampling method, the subtidal arc quadrant (SAQ) method, involved counting both kelp and macroinvertebrates. Kelp plants and select invertebrate taxa were counted regardless of the size. Individuals of other non-encrusting invertebrates were counted if they were larger than 2.5 cm (1.0 in) (length or width). Juvenile kelp plants that could not be identified to the species level were counted and recorded as "Laminariales". Five common species that generally occurred in numbers too high to accurately count in a large area were sampled in the same one-third area (2 .33 m 2 [25.1 ft2]) of each quadrant. The count for each of these species was multiplied by three to provide an abundance estimate for the entire quadrant.

The second sampling method, the subtidal line contact (SLC) method, involved identification of understory algal species, habitat-forming sessile invertebrates, and substrates at randomized points within each arc quadrant. Fifty randomly selected contact points from the possible 100 points were sampled within each quadrant (a total of 200 points per station) using a marked reference line. The same set of sampling points was used at all stations during a survey, and a new set of randomized points was selected at the start of each survey. The occurrence of all algal species, sessile invertebrates, kelp holdfasts, and substrates observed directly under or over the sampling points was recorded. In each quadrant, algal species which were present but not contacted by any of the sample points were also recorded as "present". The percent cover of each taxon and substrate type at a station was calculated using the number of points contacted for each taxon and the total number of points sampled at that station.

The third sampling method, the subtidal fixed quadrat (SFO) method, recorded the abundance of invertebrates in four permanent circular 0.25 m2 (2.7 ft2) quadrats. A quadrat was located within each of the four SAQ quadrants, generally on bedrock or boulder substrate. Depending upon the degree of topographical relief available at each station, two of the quadrats were located on horizontal-aspect surfaces and two quadrats were located on vertical-aspect surfaces. All non-encrusting taxa were identified and counted. The coverage of encrusting taxa (e.g., colonial/

social tunicates) was quantified in square inch units if the total equaled or exceeded 6.5 cm 2 (I square inch). Otherwise, the encrusting taxon was recorded as "present". The coverage estimates were converted to percentage cover for analysis.

The survey mean for each taxon at each station from the four surveys completed during the year are presented in Appendices E (SAQ), F (SLC), and G (SFQ). The survey means were calculated from the four quadrats or quadrants at each station. The annual mean and standard deviation for each taxon at each station was also calculated from the surveys sampled during the year. Algal taxa in the SLC study were given a value of 0.01 ifrecorded as present.

Additional ly, encrusting taxa in the SFQ study, and invertebrates in the SAQ study recorded as present (no numeric value) were given a value of 0.1 if recorded as cover, or a value of 1 if recorded as a count for calculating abundance statistics.

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6.0: Surface Canopy Kelps 6.0 Surface Canopy Kelps The locations and extent of the surface kelp canopies of Nereocystis luetkeana (bull kelp) and Macrocystis pyrifera (giant kelp) in Diablo Cove - (Figure 8) were surveyed and mapped from direct observations. This task has been completed annually since the 1970s to document long-term changes in the annual maximum extent of the surface kelp canopies in Diab lo Cove. Near the end of the annual growth cycle in October, nearly all bull kelp plants have reached the surface and can be counted. Surface canopies of giant kelp also tend to be

  • Areas of bull kelp Nttr<<,eysla h.Mtlc&ana (28 pl.ants) abundant during this period. Two ' G.lnt kelp canopy (1,/acrocysbs py,,(ero) observers at the headland of North Diablo Cove and two observers at the headland of South Diab lo Cove (South DCPP Diablo Point) counted and mapped the Study Area ~

Boundary ~ /

distribution of individual bull kelp /

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plants and mapped the spatial extent of /

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giant kelp canopies (Figure 9). Bull Diablo!'\

kelp plants with bare bulbs only and no Rock"\) P attached fronds , indicating senescence ' ',

in the plants, were noted when ',.

observed . ,.

The 2020 annual habit-forming kelp -----0 . bservahon Vantage Point .

survey was conducted on October 28 ,

2020. Scattered beds of giant kelp were observed in both North and South Diab lo Cove. The majority of bull kelp 0.25 mlle was observed in North Diablo Cove, 0 500m but two individual plants were noted southeast of Diablo Rock (Figure 9).

There are no appendix figures or data Figure 9. Map of surface kelp in Diablo Cove based on visual inspection from the shore on October 28, 2020 .

tables associated with this survey.

, , ESLO2021-02

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7.0 : Subtidal Fishes 7.0 Subtidal Fishes Visual counts of fishes were conducted by divers at 12 permanent subtidal stations (three stations in each of four areas) located within and outside ofDiablo Cove (Figure 10). Temperature sensor data indicated that three stations located in Patton Cove were beyond the influence of the DCPP thermal discharge. The temperature data indicated that the remaining nine stations in Field ' s Cove, North Diab lo Cove, and South Diablo Cove had varying levels of contact with the warm water from the discharge Point San Luis 0 2.5 5

- - 1Kilometers Figure 10. Locations of subtidal fish observation transects.

Each station consisted of a benthic and a midwater transect. Each transect was 50 m (164 ft) long by 4 m (13 ft) wide. The benthic transect was located 1 m (3 ft) above the bottom, and the midwater transect was located above and parallel to the benthic transect approximately midway between the surface and the bottom. A station was sampled by first deploying a fiberg lass measuring tape along a pre-determined compass course. The tape delineated the centerline of the benthic and midwater transects for that station.

~ , ESLO2021-02 f& 1 PG&E* DCPP-RWMP 2020 Annual Report 7-1

7.0: Subtidal Fishes The transects on the three stations in each area crossed one another, resulting in a small overlap among the sampling areas for the transects. The small overlap did not affect the data summaries because the numbers offish counted were averaged by area, and the mobility of most fish added to the independence of transects.

A survey team consisted of two divers. Each diver counted fish at the benthic and the midwater transect, alternating the direction of sampling along the transect lines. This sampling technique allowed a more thorough inspection of potential fish habitats from all angles of view than would have been possible by a single diver progressing along a transect in only one direction. The data recorded for each transect was the average of the counts from both divers. Fish were identified to species if possible, but juveniles of some species with similar appearances were combined into broader categories if necessary. During each survey, the stations (midwater and benthic transects) were usually sampled twice.

The mean abundance for each taxon by survey and area for benthic and midwater transects are presented in Appendix H for each of the four sampling areas. The tables also list the annual mean and standard deviation for each taxon. The survey dates shown for each area in the tables represent the average date of the combined stations sampled.

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8.0 Project Personnel 8.0 Project Personnel Project Personnel 2020 Tenera Environmental Principal Investigator/

Project Manager: Mr. John Steinbeck Project Scientists Mr. Gery Cox Mr. Chris Ehrler Mr. Andrew Harmer Ms. Maggie Jenkins Mr. Parker Kalan Mr. Scott Kimura Dr. Joe Phelan Mr. Steve Pengilley Mr. Jim Strampe Mr. Peter VanderBloomer Mrs. Tessa Victor Ms. Hailey Whitehead Ms. Kim Whiteside Project Staff: Ms. Susan King Pacific Gas and Electric Company Program Management: Mr. Bryan Cunningham

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9.0 Literature Cited 9.0 Literature Cited Tenera Environmental, Inc. 1988. Diablo Canyon Power Plant, Final Report, Thermal Effects Monitoring Program, Volume 1. Pacific Gas and Electric Company, San Francisco, CA.

Tenera Environmental, Inc. 1997. Thermal effects monitoring program, analysis report: Chapter 1 - Changes in the marine environment resulting from the Diablo Canyon Power Plant discharge. Pacific Gas and Electric Company, San Francisco, CA.

Tenera Environmental, Inc. 1999a. Receiving Water Monitoring Program - 1995-1997 Progress Report. Pacific Gas and Electric Company, San Francisco, CA.

Tenera Environmental, Inc. 1999b. Receiving Water Monitoring Program - 1995-1998 Progress Report. Pacific Gas and Electric Company, San Francisco, CA.

Tenera Environmental, Inc. 2002. Diablo Canyon Power Plant, Receiving Water Monitoring Program - 1995-2002 Analysis Report. Pacific Gas and Electric Company, San Francisco, CA

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Diab/a Canyon Power Plant Appendix A Intertidal Temperatures

Appendix A - Intertidal Temperatures Table Al . Monthly statisti cal summary of intertidal temperatures (0 C), January-Decem ber 2020, North Control Stati on NC 2 +0.6m (2+2).

Month Max Min Mean Std. Dev N Station: NC 2 +0.6m Jan 14.15 12.01 12.96 0.47 1196 Feb 14.45 10.55 12.88 0.88 1070 Mar 16.08 12.33 14.26 0.79 1125 Apr 14.97 10.47 12.39 0.93 1102 May 15.30 10.14 12.59 1.17 1151 Jun 16.20 10.52 13.65 1.19 1164 Jul 16.16 11.77 14.29 0.94 1250 Aug 17.01 11.71 14.24 1.12 1316 Sep 16.09 12.50 14.41 0.75 1264 Oct 16.57 13.30 15.02 0.66 1270 Nov 15.60 10.58 12.44 1.14 1217 Dec 12.88 11 .23 12.12 0.42 1272

~ ESLO2021-02 A-1

Appendix A - Intertidal Temperatures Table A2 . Monthly statistical summary of intertidal temperatures (°C), January- December 2020, Field' s Cove Stations FC 1 +0.6m (4+2), FC 2 +0.6m (5+2) and FC 3

+0.6m (6+2).

Month Max Min Mean Std. Dev N Station: FC 1 +0.6m Jan 15.88 12.33 13.94 0.67 1510 Feb 16.21 11.01 14.10 1.08 1307 Mar 17.97 12.43 15.44 1.09 1357 Apr 17.28 10.60 13.42 1.27 1278 May 17.60 10.56 13.40 1.35 1342 Jun 19.60 11.45 15.02 1.70 1361 Jul 18.82 11 .88 15.72 1.24 1521 Aug 20.12 12.51 16.24 1.43 1546 Sep 18.98 12.86 16.37 1.34 1434 Oct 17.05 13.85 15.34 0.64 1432 Nov 16.05 10.97 13.09 1.06 1389 Dec 14.44 11.24 12.57 0.50 1468 Station: FC 2 +0.6m Jan 15.91 12.33 14.00 0.66 1196 Feb 16.18 11.04 14.14 1.04 1070 Mar 17.83 12.57 15.40 1.06 1125 Apr 17.18 10.59 13.31 1.25 1102 May 17.08 10.58 13.28 1.30 1151 Jun 19.45 11.52 14.91 1.67 1164 Jul 18.73 11.96 15.55 1.21 1250 Aug 20.01 12.59 16.15 1.41 1316 Sep 19.08 12.88 16.35 1.33 1264 Oct 16.96 13.90 15.34 0.63 1270 Nov 16.00 11 .18 13.12 1.05 1217 Dec 14.50 11 .28 12.61 0.50 1272 Station: FC 3 +0.6m Jan 15.92 12.31 13.98 0.66 1196 Feb 16.20 11 .04 14.11 1.03 1070 Mar 17.59 12.51 15.35 1.04 1125 Apr 16.79 10.54 13.22 1.22 1102 May 16.84 10.54 13.17 1.28 1151 Jun 19.19 11.41 14.76 1.64 1164 Jul 18.29 11.87 15.39 1.19 1250 Aug 19.96 12.52 16.02 1.40 1316 Sep 19.09 12.86 16.25 1.30 1264 Oct 16.94 13.81 15.30 0.62 1270 Nov 15.77 11.17 13.09 1.05 1217 Dec 14.47 11 .22 12.58 0.50 1272 c~ ESLO2021-02 A-2

Appendix A - Intertidal Temperatures Table A3 . Monthl y stati stical summary of intertidal temperatures (0 C), January-December 2020, North Diablo Cove Stations NDC 1 +0.6m (7+2), NDC 2 +0.6m (8+2) and NDC 3 +0 .6m (9+2).

Month Max Min Mean Std. Dev N Station: NOC 1 +0.6m Jan 20.88 12.49 16.19 1.59 1510 Feb 20.48 11 .56 16.66 1.57 1307 Mar 22.09 12.69 18.16 1.51 1357 Apr 20.97 11 .52 16.15 1.77 1278 May 23.95 12.45 16.77 2.08 1342 Jun 22.58 11.95 17.98 2.04 1361 Jul 22.16 13.48 17.91 1.55 1521 Aug 23.05 13.08 18.62 1.74 1546 Sep 22.09 12.40 18.70 1.73 1434 Oct 21 .36 14.03 16.54 1.67 1432 Nov 19.60 11 .17 15.30 1.48 1389 Dec 18.68 11.45 13.98 1.50 1468 Station: NOC 2 +0.6m Jan 20.74 12.59 16.31 1.58 1152 Feb 20.39 11 .50 16.88 1.57 1025 Mar 21.68 12.85 18.34 1.57 1078 Apr 20.87 11 .80 16.44 1.80 1067 May 23.80 13.16 17.31 2.12 1114 Jun 23.09 12.08 18.32 2.12 1126 Jul 22.33 14.13 18.03 1.56 1211 Aug 22.75 12.87 18.66 1.74 1273 Sep 21 .86 12.51 18.80 1.70 1234 Oct 20.90 14.05 16.66 1.75 1246 Nov 19.04 11 .22 15.46 1.50 1189 Dec 18.38 11.47 14.02 1.51 1236 Station: NOC 3 +0.6m Jan 21.11 12.49 16.48 1.72 1521 Feb 20.57 11.55 17.00 1.70 1322 Mar 22.38 12.92 18.37 1.54 1366 Apr 21.56 11.79 16.57 1.78 1288 May 23.76 13.14 17.40 2.15 1353 Jun 23.04 12.21 18.34 2.05 1371 Jul 22.45 14.31 18.04 1.53 1535 Aug 22.77 12.79 18.61 1.72 1569 Sep 21 .90 12.61 18.80 1.66 1448 Oct 21 .18 14.18 16.64 1.75 1448 Nov 19.66 11.25 15.66 1.52 1407 Dec 19.65 11.49 14.27 1.64 1478 t' ESLO2021-02 A-3

Appendix A - Intertidal Temperatures Table A4. Monthly statistical summary of intertidal temperatures (0 C), January-December 2020, South Diablo Cove Stations SDC I +0.6m (10+2), SDC 2 +0.6m (11+2) and SDC 3 +0.6m (12+2).

Month Max Min Mean Std. Dev N Station: SDC 1 +0.6m Jan 23.84 13.92 18.03 2.54 1533 Feb 23.57 13.78 16.63 2.09 1340 Mar 23.76 13.77 17.23 1.76 1384 Apr 22.42 11 .50 16.21 2.35 1297 May 23.86 12.81 16.64 2.31 1364 Jun 23.20 12.96 17.06 2.21 1384 Jul 22.80 12.92 16.02 1.94 1545 Aug 22.87 13.35 16.79 1.64 1581 Sep 23.40 13.76 17.20 1.54 1463 Oct 23.29 14.18 16.59 1.79 1459 Nov 21.69 11.77 13.90 1.27 1418 Dec 21.60 11 .64 13.43 0.99 1487 Station: SDC 2 +0.6m Jan 21 .87 13.92 16.68 1.24 1196 Feb 22.30 13.55 16.22 1.59 1070 Mar 23.24 13.73 17.08 1.60 1125 Apr 21.74 11 .65 16.10 2.16 1102 May 23.17 13.00 16.59 2.05 1151 Jun 22.51 13.16 17.28 2.06 1164 Jul 22.42 13.15 16.22 1.89 1250 Aug 22.64 13.41 17.03 1.58 1316 Sep 22.56 13.93 17.29 1.38 1264 Oct 22.39 14.17 16.55 1.72 1270 Nov 20.59 11 .82 13.82 1.15 1217 Dec 20.45 11.77 13.35 0.82 1272 Station: SDC 3 +0.6m Jan 18.99 13.63 16.23 0.96 1350 Feb 19.65 13.74 15.67 0.98 1207 Mar 20.54 13.49 16.40 1.06 1264 Apr 19.63 11.31 14.86 1.44 1204 May 21.55 12.64 15.55 1.53 1260 Jun 21.60 13.02 16.56 1.71 1274 Jul 20.91 12.88 15.90 1.61 1421 Aug 20.96 13.07 16.56 1.40 1437 Sep 20.54 13.81 16.74 1.16 1352 Oct 20.88 13.97 16.16 1.41 1363 Nov 17.11 11.67 13.66 1.06 1315 Dec 16.78 11.74 13.42 0.67 1389 t' ESLO2021-02 A-4

Appendix A - Intertidal Temperatures Table AS . Monthly statistical summary of intertidal temperatures (0 C), January- December 2020, South Diablo Point Stations SOP I +0.6m (22+2) and SOP 2 +0.6m (14+2).

Month Max Min Mean Std. Dev N Station: SOP 1 +0.6m Jan 19.25 13.63 16.23 0.97 1577 Feb 20.23 13.78 15.73 1.00 1384 Mar 20.64 13.51 16.41 1.01 1420 Apr 19.19 11 .26 14.84 1.38 1343 May 21.33 12.42 15.47 1.52 1405 Jun 21.70 13.03 16.44 1.67 1423 Jul 20.99 12.80 15.63 1.58 1578 Aug 21 .39 12.83 16.37 1.46 1620 Sep 20.56 13.60 16.68 1.1 6 1488 Oct 21 .04 13.90 16.19 1.46 1493 Nov 17.20 11 .69 13.69 1.06 1447 Dec 17.19 11 .88 13.46 0.66 1522 Station : SOP 2 +0.6m Jan 17.62 12.84 15.15 0.83 1510 Feb 18.20 12.78 15.01 0.92 1307 Mar 18.54 13.10 15.49 0.83 1357 Apr 17.1 0 11.19 13.87 1.14 1278 May 17.51 10.76 13.92 1.11 1342 Jun 19.30 11 .29 15.17 1.42 1361 Jul 18.76 11 .87 14.89 1.15 1521 Aug 21 .26 12.33 15.83 1.38 1546 Sep 19.22 12.73 15.97 1.12 1434 Oct 18.31 13.63 15.35 0.81 1432 Nov 16.60 11 .67 13.58 1.05 1389 Dec 16.15 11.64 13.20 0.58 1468

~ ESLO2021 -02 A-5

Appendix A - Intertidal Temperatures Table A6. Monthly statistical summary of intertidal temperatures (0 C), January-December 2020, South Control Stations SC I +0.6m (19+2) and SC IV +0.6m.

Month Max Min Mean Std. Dev N Station: SC 1 +0.6m Jan 13.96 11.93 13.04 0.47 1329 Feb 14.17 10.92 12.84 0.75 1190 Mar 15.43 11 .55 13.85 0.78 1247 Apr 13.39 9.89 -11.67 0.86 1186 May 15.41 9.93 12.04 1.33 1248 Jun 15.75 10.28 13.17 1.30 1258 Jul 15.33 10.91 13.53 0.87 1397 Aug 17.20 11 .24 13.66 1.19 1426 Sep 16.07 11 .95 14.11 0.78 1340 Oct 16.83 12.89 14.85 0.69 1349 Nov 15.62 10.98 12.46 1.18 1307 Dec 12.96 11 .29 12.16 0.38 1375 Station: SC 1V Jan 14.59 11.31 12.95 0.66 1655 Feb 15.73 10.32 13.09 1.06 1489 Mar 17.00 12.33 14.28 0.91 1512 Apr 17.06 10.26 12.92 1.28 1416 May 18.05 10.06 13.36 1.65 1487 Jun 19.00 10.93 14.88 1.58 1503 Jul 18.65 12.15 15.47 1.23 1659 Aug 19.07 12.74 15.49 1.34 1692 Sep 18.05 12.98 15.33 0.91 1585 Oct 17.64 13.61 15.53 0.77 1565 Nov 16.96 10.57 12.69 1.40 1533 Dec 13.51 11 .22 12.19 0.46 1599 t' ESLO2021 -02 A-6

Diab/o Canyon Power Plant Appendix B Subtidal Temperatures

Appendix B - Subtidal Temperatures Table Bl. Monthly statistical summary of subtidal temperatures (0 C), January-December 2020, North Control Station NC 1 -3m (1-10).

Month Max Min Mean Std. Dev N Station: NC 1 -3m Jan 14.30 12.08 13.06 0.45 2232 Feb 14.42 10.87 12.98 0.77 2088 Mar 16.42 12.03 14.26 0.84 2232 Apr 14.44 10.16 12.13 0.96 2160 May 15.15 9.99 12.17 1.23 2232 Jun 15.76 10.23 13.11 1.23 2160 Jul 15.54 11 .20 13.57 0.84 2231 Aug 16.58 11.26 13.64 1.11 2232 Sep 15.98 12.19 14.18 0.77 2159 Oct 16.48 13.18 14.94 0.68 2232 Nov 15.68 10.90 12.46 1.11 2160 Dec 13.07 11 .26 12.22 0.39 2232 Table B2. Monthly statistical summary of subtidal temperatures (°C), January-December 2020, Field's Cove Station FC 1 -3m (22-10).

Month Max Min Mean Std. Dev N Station : FC 1 -3m Jan 16.23 12.35 14.04 0.67 2232 Feb 16.59 11.14 14.26 1.00 2088 Mar 17.82 12.60 15.51 1.07 2232 Apr 16.24 10.59 13.31 1.19 2160 May 16.51 10.34 13.06 1.29 2232 Jun 18.41 10.90 14.31 1.46 2160 Jul 17.03 11 .78 14.56 0.90 2231 Aug 19.66 11 .93 15.26 1.36 2232 Sep 19.09 12.80 15.95 1.16 2160 Oct 17.01 13.70 15.31 0.59 2231 Nov 15.95 11.25 13.21 1.09 2160 Dec 14.49 11.40 12.72 0.50 2232 C' ESLO2021-02 B-1

Appendix B - Subtidal Temperatures Table B3. MonthJy statistical summary of subtidal temperatures (0 C), January-December 2020, North Diablo Cove Stations NDC 2 -3m (8-10), NDC 3 -3m (9-10), and NDC 4 -4m (9-15).

Month Max Min Mean Std. Dev N Station: NDC 2 -3m Jan 21 .51 12.49 16.76 1.83 2232 Feb 21.11 11.55 17.20 1.72 2087 Mar 22.78 12.90 18.55 1.64 2232 Apr 21 .92 11.70 16.72 1.86 2160 May 23.79 12.32 17.24 2.31 2231 Jun 23.24 11 .64 17.64 2.12 2160 Jul 22.74 12.66 17.00 1.95 2232 Aug 23.15 12.64 17.70 1.93 2232 Sep 22.49 12.47 18.26 1.81 2159 Oct 21.35 13.78 16.50 1.75 2232 Nov 20.06 11 .23 15.81 1.69 2160 Dec 20.33 11 .53 14.60 1.81 2232 Station: NDC 3 -3m Jan 22.07 12.47 17.15 1.96 2232 Feb 21.69 11.63 17.29 1.78 2087 Mar 23.43 13.26 18.57 1.71 2232 Apr 22.11 11.72 16.81 1.97 2159 May 23.98 11.87 17.27 2.41 2232 Jun 23.59 11.65 17.42 2.27 2160 Jul 23.10 12.37 16.53 2.09 2232 Aug 23.22 12.64 17.31 2.06 2231 Sep 22.38 12.68 17.95 1.91 2160 Oct 21 .67 13.71 16.39 1.81 2232 Nov 20.86 11 .27 15.87 1.81 2160 Dec 20.87 11.50 14.96 1.94 2232 Station: NDC 4 -4m Jan 21.34 12.45 16.66 1.75 2232 Feb 20.85 11.61 16.90 1.70 2087 Mar 22.95 12.37 17.86 1.79 2232 Apr 21 .59 11.07 16.09 1.94 2159 May 23.37 11 .08 16.36 2.23 2232 Jun 22.85 11.48 16.04 2.20 2160 Jul 22.60 11 .36 15.00 2.02 2232 Aug 21 .92 11.87 15.68 2.04 2231 Sep 21 .50 11.99 16.38 2.02 2160 Oct 21 .23 13.66 15.94 1.47 2232 Nov 19.64 11.17 15.19 1.74 2160 Dec 19.86 11.48 14.44 1.70 2232

"'ESL02021 -02 B-2

Appendix B - Subtidal Temperatures Table B4. Monthly statistical summary of subtidal temperatures (0 C), January-December 2020, South Diablo Cove Stations SDC 1 -3m (11-10) and SDC 4 -4m (11-15) .

Month Max Min Mean Std. Dev N Station: SDC 1 -3m Jan 24.02 13.12 16.94 1.90 2232 Feb 22.90 12.86 16.13 1.95 2087 Mar 23.08 12.39 16.29 1.64 2232 Apr 20.91 10.92 15.04 2.05 2159 May 21.83 10.94 15.45 2.07 2232 Jun 22.29 11.74 15.54 2.10 2160 Jul 22.46 11 .91 14.67 1.91 2232 Aug 22.15 11 .17 14.90 1.79 2233 Sep 20.97 12.23 15.68 1.64 2160 Oct 20.95 12.97 15.61 1.28 2232 Nov 21.00 11.67 13.77 1.27 2160 Dec 21.44 11 .92 13.47 0.88 2232 Station: SDC 4 -4m Jan 22.47 12.53 16.05 1.97 2232 Feb 21 .64 12.05 14.85 1.73 2087 Mar 19.16 10.85 14.81 1.38 2232 Apr 19.66 10.35 13.14 1.62 2159 May 19.44 9.92 13.69 2.00 2232 Jun 20.06 10.09 13.50 1.85 2160 Jul 20.03 10.51 13.32 1.54 2232 Aug 18.69 10.69 13.07 1.33 2233 Sep 20.78 11 .68 14.07 1.45 2160 Oct 19.60 12.42 14.99 0.93 2232 Nov 18.54 11.36 13.59 1.12 2160 Dec 19.24 12.00 13.44 0.73 2232 C'- ESLO2021-02 B-3

Appendix B - Subtidal Temperatures Table BS. Monthly statistical summary of subtidal temperatures (0 C), January-December 2020, South Control Stations SC 1 -3m (19-10) and SC 2 -6m (20-20).

Month Max Min Mean Std. Dev N Station: SC 1 -3m Jan 14.25 11.88 13.10 0.48 2232 Feb 14.39 10.96 12.98 0.72 2088 Mar 15.62 11 .58 13.92 0.80 2232 Apr 13.53 9.81 11.75 0.88 2160 May 15.33 9.87 11.85 1.28 2232 Jun 14.79 12.20 13.44 0.72 176 Jul - - . - -

Aug 15.30 12.44 13.69 0.62 472 Sep 15.91 12.03 14.02 0.75 2160 Oct 16.84 12.84 14.85 0.69 2232 Nov 15.88 10.88 12.47 1.19 2160 Dec 13.04 11 .28 12.23 0.38 2232 Station: SC 2 -6m Jan 14.00 11 .99 13.11 0.45 2232 Feb 14.07 10.96 12.94 0.66 2088 Mar 15.33 10.72 13.82 0.87 2232 Apr 13.12 9.73 11.47 0.88 2160 May 14.90 9.63 11.48 1.26 2232 Jun 15.35 9.79 12.38 1.29 2159 Jul 14.96 10.39 12.47 0.82 2232 Aug 16.86 10.25 12.70 1.23 2231 Sep 15.58 11 .55 13.66 0.76 2160 Oct 16.67 12.27 14.58 0.71 2232 Nov 15.74 10.90 12.38 1.15 2160 Dec 13.04 11.30 12.23 0.37 2232 t' ESLO2021 -02 B-4

Appendix B - Subtidal Temperatures Table B6. Monthly statistical summary of subtidal temperatures (°C), January-December 2020. Monthly means were calculated by combining and averaging values collected at South Control Station SC 1 -3m (19-10) and North Control Station NC 1 -3m (1-10).

Month Max Min Mean Std. Dev N Jan 14.28 11.98 13.08 0.46 2232 Feb 14.40 10.95 12.98 0.74 2088 Mar 15.99 11.86 14.09 0.81 2229 Apr 13.91 10.01 11.94 0.91 2160 May 15.10 9.94 12.01 1.24 2232 Jun 15.76 10.23 13.11 1.24 2160 Jul 15.54 11 .20 13.57 0.84 2232 Aug 16.58 11.26 13.60 1.09 2232 Sep 15.95 12.31 14.10 0.74 2160 Oct 16.57 13.09 14.89 0.66 2232 Nov 15.77 10.95 12.46 1.14 2160 Dec 13.05 11.27 12.23 0.37 2232 t' ESLO2021-02 B-5

Diab/a Canyon Power Plant Appendix C Intertidal Algae, Invertebrates and Substrates

Append ix C - Intertidal Algae , Invertebrates and Substrates Ta ble Cl . Intertidal algae, sessile invertebrates, and substrates (percent cover) and motil e invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Control Station NC l+0.3m (1+1).

Survey 200 201 202 203 Survey Date 19-Feb-20 12-May-20 08-Jul-20 16-Dec-20 Annu al Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Phy/lospadix spp. 31 .9 24.6 21.9 26.2 26.18 4.23 non-coralline crust 25.5 24.3 20. 1 28.1 24.50 3.36 Mazzaella flaccida 13.3 32.8 34.1 10.7 22.73 12.43 Mazzaella affinis 9.4 15.1 13.3 8.0 11.48 3.33 Gastroclonium subarticu/atum 10.3 4.5 7.2 11 .0 8.26 2.99 coralline crust 7.4 7.5 6.3 7.4 7.15 0.60 Mastocarpus papilla/us 1.7 3.8 5.8 3.7 3.75 1.70 Gelidium cou/teri 3.5 4.3 3.8 3.1 3.66 0.52 Chondracanthus canaliculatus 2.5 4.4 3.3 3.4 3.39 0.77 Codium setchellii 1.5 2.0 4.0 3.9 2.85 1.26 Cryptopleura vio/acea 2.7 1.7 1.3 0.5 1.53 0.93 Prionitis spp. 3.3 0.8 1.0 0.8 1.46 1.21 fi lamentous red algae complex 0.6 2.9 1.7 - 1.29 1.29 juv. articulated coralline algae 1.1 1.0 0.6 1.6 1.08 0.40 Mazzae/la /eptorhynchos 0.5 1.8 1.9 <0.1 1.04 0.94 Endocladia muricata 0.9 1.2 1.0 1.0 1.04 0.11 Mastocarpus jardinii 0.7 0.9 1.0 1.2 0.94 0.20 Corallina vancouveriensis 1.4 0.2 0.4 0.5 0.61 0.53 Mazzae/la oregona <0.1 0.8 0.2 <0.1 0.26 0.39 Smithora naiadum <0.1 - 0.8 <0.1 0.19 0.38 Calliarthron/Bossie/la spp.-complex <0.1 <0.1 0.4 <0.1 0.16 0.17 Gelidium pusillum <0.1 <0.1 0.2 0.1 0.11 0.09 Egregia menziesii - - - 0.4 0.10 0.21 Porphyra spp. - <0.1 0.3 - 0.09 0.13 Pterosiphonia dendroidea <0.1 0.1 <0.1 <0.1 0.07 0.06 U/va spp. - <0.1 0.3 <0.1 0.07 0.14 Sarcodiotheca gaudichaudii <0.1 <0.1 0.1 <0.1 0.05 0.06 Chondracanthus corymbiferus <0.1 0.2 - <0.1 0.05 0.10 Callithamnion pikeanum - <0.1 0.1 - 0.05 0.07 Osmundea spp. <0.1 <0.1 <0.1 <0.1 0.04 0.04 Cladophora spp. <0.1 <0.1 <0.1 <0.1 0.03 0.03 Grateloupia ca/ifornica <0.1 <0.1 - - 0.02 0.03 Mazzae/la sp/endens - - <0.1 <0.1 0.02 0.03 Ca/lophyllis spp. - - <0.1 - 0.02 0.03 Chlorophyta (filamentous) - - <0.1 - . 0.02 0.03 Halymenia/Schizymenia spp.-complex - <0.1 - - 0.02 0.03 Me/obesia mediocris <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Microcladia cou/teri <0.1 <0.1 <0.1 - <0.01 <0.01 Callithamnion spp./Pleonosporium spp. <0.1 - - - <0.01 <0.01 Colpomenia spp. - - <0.1 - <0.01 <0.01 Cryptosiphonia woodii - <0.1 - - <0.01 <0.01 Rhodymenia spp. - <0.1 - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 78.6 69.2 79.6 63.0 72.60 7.93 Paaurus soo. 19.0 4.6 4.6 4.8 8.25 7.17 (table continued) t' ESLO2021-02 C-1

Append ix C - Intertidal Algae, Invertebrates and Substrates Table Cl (continued). Intertidal algae, sessi le invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Control Station NC 1+0.3m (1+1).

Survey 200 201 202 203 Survey Date 19-Feb-20 12-May-20 08-Jul-20 16-Dec-20 Annual An nual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Crepidula spp. 1.0 0.6 0.8 0.8 0.80 0.16 Lottiidae 1.2 0.8 0.8 0.2 0.75 0.41 Leptasterias spp. - 0.6 1.2 0.8 0.65 0.50 Serpulidae 0.4 0.6 0.2 0.8 0.50 0.26 Nemertea 0.4 0.2 0.2 0.4 0.30 0.12 Epiactis prolifera 0.2 0.2 0.2 0.4 0.25 0.10 Fissure/la volcano - - 0.2 0.8 0,25 0.38 Lirobittium spp. - 0.2 - 0.8 0.25 0.38 Pachygrapsus crassipes 0.2 0.6 - 0.2 0.25 0.25 Acmaea mitra 0.4 0.2 0.2 - 0.20 0.16 Anthopleura elegantissima 0.4 - - 0.4 0.20 0.23 Mitra idae 0.2 - 0.2 0.4 0.20 0.16 Lacuna spp. 0.2 0.2 - 0.2 0.15 0.10 Ocinebrina spp. 0.2 - - 0.4 0.15 0.19 Pugettia spp. 0.2 0.2 - 0.2 0.15 0.10 Lottia limatula - 0.6 - - 0.15 0.30 Oiodora spp. 0.4 - - - 0.10 0.20 Lottia pelta - - 0.4 - 0.10 0.20 Lottia scutum - - 0.4 - 0.10 0.20 Ocinebrina subangulata 0.2 - - 0.2 0.10 0.12 Aeolidia papil/osa 0.2 - - - 0.05 0.10 Alia spp. - - - 0.2 0.05 0.10 Lottia instabilis 0.2 - - - 0.05 0.10 Lottia scabra 0.2 - - - 0.05 0.1 0 Nereididae - - - 0.2 0.05 0.10 Tetraclita rubescens - 0.2 - - 0.05 0.10 Invertebrate Coverage Pistaspp. 11 .2 5.7 13.9 14.8 11 .39 4.09 tunicates, compound/social <0.1 0.2 0.2 <0.1 0.13 0.10 Phragmatopoma californica <0.1 <0.1 <0.1 <0.1 0,02 0.03 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0,01 <0.01 Bryozoa (encrusting) <0.1 - <0.1 <0.1 <0.01 <0.01 Salmacina tribranchiata - <0.1 <0.1 - <0.01 <0.01 Chthamalus fissus <0.1 <0.1 - - <0.01 <0.01 Substrate Cover rock 3.0 5.0 3.3 5.5 4.20 1.23 sand (shell gravel) 3.0 4.7 2.5 4.9 3.77 1.20 cobble 1.6 0.6 1.1 0.9 1.04 0.44 t' ESLO2021-02 C-2

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C2. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Control Station NC 1+0.9m (1+3).

Survey 200 201 202 203 Survey Date 19-Feb-20 12-May-20 08-Jul-20 16-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 35.2 25.3 24.0 31 .1 28.91 5.22 Endocladia muricata 19.7 22.9 23.6 17.9 21 .04 2.68 coralline crust 11.8 11 .4 8.3 18.3 12.43 4.20 Mastocarpus papillatus 8.8 7.8 17.4 10.1 11.06 4.35 Mazzael/a flaccida 5.9 9.7 13.4 10.7 9.91 3.11 Codium setchel/ii 3.7 1.6 3.1 2.6 2.74 0.88 Mazzael/a affinis 2.2 0.4 2.4 1.4 1.58 0.88 Corallina vancouveriensis 2.4 1.7 0.5 1.7 1.56 0.80 juv. articulated coralline algae 0.9 1.3 1.4 1.6 1.29 0.29 Ge/idium cou/teri 1.0 0.9 1.1 2.1 1.27 0.55 Si/vetia compressa 0.8 0.9 1.5 0.6 0.94 0.37 Mastocarpus jardinii 0.5 0.7 0.9 0.6 0.68 0.17 Phyl/ospadix spp. 1.0 0.3 0.6 0.5 0.59 0.27 Prionitis spp. 0.6 0.3 0.3 0.4 0.43 0.13 Gelidium pusillum 0.4 0.3 0.1 0.1 0.25 0.13 Porphyra spp. <0.1 <0.1 0.8 <0.1 0.21 0.42 Analipus japonicus 0.2 . 0.1 0.3 0.16 0.12 Chondracanthus canaliculatus 0.1 <0.1 0.2 0.2 0.14 0.10 Gastroclonium subarticulatum 0.3 <0.1 . - 0.09 0.17 C/adophora spp. <0.1 <0.1 <0.1 <0.1 0.06 0.04 Calliarthron!Bossiel/a spp.-complex <0.1 <0.1 <0.1 <0.1 0.02 0.03 Cryptop/eura violacea <0.1 - - <0.1 0.02 0.03 Scytosiphon spp. - <0.1 - - 0.02 0.03 Mazzaella leptorhynchos <0.1 <0.1 <0.1 - <0.01 <0.01 U/va spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Chlorophyta (filamentous) - - <0.1 - <0.01 <0.01 filamentous red algae complex - - - <0.1 <0.01 <0.01 Codium fragile subsp. californicum - - - <0.1 <0.01 <0.01 Mazzaella oregona - - <0.1 - <0.01 <0.01 Nemalion helminthoides - <0.1 - - <0.01 <0.01 Rhodymenia spp. - - <0.1 - <0.01 <0.01 Sarcodiotheca gaudichaudii <0.1 - - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 125.2 155.4 77.4 92.0 112.50 34.90 Pagurus spp. 6.4 5.0 18.8 5.4 8.90 6.63 Mytilus spp. 3.8 2.0 2.4 30 2.80 0.78 Lottia scabra 3.0 1.0 1.8 1.4 1.80 0.86 Nuttallina ca/ifornica 2.0 1.0 1.2 2.2 1.60 0.59 Pachygrapsus crassipes 0.4 1.6 1.4 2.0 1.35 0.68 Pollicipes polymerus 1.8 2.0 - 1.2 1.25 0.90 Mopa/iaspp. 0.8 1.8 1.4 0.8 1.20 0.49 Lottiidae 0.2 1.8 1.6 0.8 1.1 0 0.74 Lottia limatula 0.4 2.2 1.4 0.2 1.05 0.93 Lottia pet/a - 1.8 1.4 0.2 0.85 0.89 Anthop/eura eleaantissima 0.8 0.6 0.4 0.4 0.55 0.19 (table continued) c, ESLO2021-02 C-3

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C2 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Control Station NC 1+0.9m (1 +3).

Survey 200 201 202 203 Survey Date 19-Feb-20 12-May-20 08-Jul-20 16-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Fissure/la volcano 0.4 0.8 0.2 0.4 0.45 0.25 Lottia scutum - 1.0 0.2 0.6 0.45 0.44 Leptasterias spp. 0.2 - 1.4 0.2 0.45 0.64 Crepidu/a spp. 0.2 0.4 0.4 0.2 0.30 0.12 Grapsidae - 0.4 0.6 - 0.25 0.30 Nemertea - - 0.2 0.6 0.20 0.28 Ocinebrina spp. - 0.6 - 0.2 0.20 0.28 Tetraclita rubescens 0.4 0.4 - - 0.20 0.23 Sipuncula - - 0.4 0.2 0.15 0.19 Cyanoplax spp. - - 0.4 - 0.10 0.20 Lottia gigantea - - 0.2 0.2 0.10 0.12 Serpulidae 0.2 0.2 - - 0.10 0.12 Ba/anus spp. 0.2 - - - 0.05 0.10 Cucumaria spp. - - - 0.2 0.05 0.10 Epiactis prolifera 0.2 - - - 0.05 0.10 Eulithidium spp. - 0.2 - - 0.05 0.10 Hemigrapsus nudus 0.2 - - - 0.05 0.10 Heptacarpus spp. - - - 0.2 0.05 0.10 lschnochitonidae - - - 0.2 0.05 0.10 Lirobittium spp. 0.2 - - - 0.05 0.10 Littorina spp. 0.2 - - - 0.05 0.10 Lottia ochracea - 0.2 - - 0.05 0.10 Pseudomelatoma torosa 0.2 - - - 0.05 0.10 Pugettia spp. - - 0.2 - 0.05 0.10 Invertebrate Cover Phragmatopoma californica 0.4 0.8 0.4 0.4 0.49 0.19 Chthamalus fissus <0.1 <0.1 <0. 1 <0.1 0.01 <0.01 Spirorbidae <0.1 <0.1 <0.1 <0. 1 <0.01 <0.01 Bryozoa (encrusting) <0. 1 - <0.1 - <0.01 <0.01 Pis/aspp. - - <0.1 <0. 1 <0.01 <0.01 tunicates, compound/social <0. 1 - <0.1 - <0.01 <0.01 Ha/ic/ona spp. - - <0.1 - <0.01 <0.01 Porifera (encrusting) <0.1 - - - <0.01 <0.01 Salmacina tribranchiata <0. 1 - - - <0.01 <0.01 Substrate Cover rock 13.5 24.7 15.9 19.7 18.44 4.90 cobble 2.6 4.0 3.3 1.5 2.83 1.04 sand (shell Qravel) 0.2 1.0 0.4 1.9 0.90 0.78

~ ESLO2021-02 C-4

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C3. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2 ) survey means, standard deviations and 2020 annual means for North Control Station NC 2+0.3m (2+ 1).

Survey 200 201 202 203 Survey Date 05-Feb-20 13-Apr-20 20-Jul-20 02-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 30.5 25.6 14.3 30.3 25.17 7.58 Phyllospadix spp. 26.0 21 .2 23.0 21.4 22.88 2.21 Mazzaella flaccida 8.2 22.9 39.2 14.8 21 .27 13.37 Mazzael/a affinis 3.8 8.1 14.5 9.0 8.84 4.42 Gastroc/onium subarticulatum 9.9 6.9 7.8 9.3 8.47 1.40 Mastocarpus papilla/us 4.5 9.7 13.1 2.4 7.40 4.86 coralline crust 2.8 3.8 3.8 9.6 5.00 3.09 Chondracanthus canalicu/atus 1.8 4.5 5.3 1.9 3.39 1.82 Codium setchel/ii 3.3 2.4 3.3 4.2 3.30 0.77 Mastocarpus jardinii 1.3 1.4 3.0 5.7 2.83 2.07 Ge/idium coulteri 1.1 4.1 3.7 2.1 2.74 1.39 Mazzaella oregona 0.5 6.0 0.8 - 1.82 2.83 juv. articulated coralline algae 2.2 1.7 1.7 1.5 1.76 0.27 Corallina vancouveriensis 1.8 0.7 1.3 3.1 1.72 1.04 Smithora naiadum <0.1 - 6.0 <0.1 1.51 3.02 Prionitis spp. 2.2 1.0 1.0 1.4 1.41 0.57 Cryptopleura violacea 0.6 0.8 2.2 <0.1 0.90 0.94 Mazzael/a /eptorhynchos 0.3 1.5 1.0 0.1 0.73 0.63 filamentous red algae complex 0.6 0.6 1.4 - 0.66 0.57 Porphyra spp. - - 1.9 - 0.49 0.97 Ulva spp. <0.1 <0.1 1.5 <0.1 0.37 0.73 Neorhodome/a larix 0.6 0.3 <0.1 <0.1 0.24 0.28 Endoc/adia muricata 0.4 0.1 <0.1 - 0.1 4 0.15 Grate/oupia califomica <0.1 <0.1 0.4 <0.1 0.12 0.20 Ge/idium pusillum <0.1 <0.1 <0.1 0.3 0.09 0.13 Osmundea spp. <0.1 <0.1 <0.1 0.1 0.09 0.03 Plerosiphonia dendroidea <0.1 <0.1 <0.1 0.3 0.09 0.1 3 Cal/iarthron/Bossiella spp.-complex 0.2 <0.1 <0.1 <0.1 0.07 0.10 Microcladia cou/teri <0.1 <0.1 0.1 0.1 0.07 0.08 Cryptopleura ruprechtiana - 0.2 <0.1 - 0.05 0.10 Chondracanthus corymbiferus - <0.1 <0.1 <0.1 0.05 0.03 Halymenia/Schizymenia spp.-complex <0.1 - 0.1 - 0.04 0.07 Mazzaella splendens - 0.1 - - 0.03 0.07 Sarcodiotheca gaudichaudii <0.1 <0.1 <0.1 <0.1 0.02 0.03 Callophyllis spp. - <0.1 - - 0.02 0.03 Melobesia mediocris <0.1 <0.1 <0.1 <0.1 0.01 <0.01 C/adophora spp. <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Chlorophyta (filamentous) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Callithamnion pikeanum <0.1 <0.1 - - <0.01 <0.01 Colpomenia spp. - - <0.1 - <0.01 <0.01 Bryopsis spp. - - - <0.1 <0.01 <0.01 Chondria decipiens - <0.1 - - <0.01 <0.01 Cora/Jina chilensis - <0.1 - - <0.01 <0.01 Ge/idium robustum - <0.1 - - <0.01 <0.01 (table continued)

C' ESLO2021-02 C-5

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C3 (continued). Intertidal algae, sessi le invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Control Station NC 2+0.3m (2+ 1).

Survey 200 201 202 203 Survey Date 05-Feb-20 13-Apr-20 20-Jul-20 02-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Ch/orostoma funebralis 30.6 36.8 6.2 25.4 24.75 13.22 Pagurus spp. 5.8 10.0 9.4 6.4 7.90 2. 11 Lottia scabra 6.8 5.2 5.6 3.0 5.15 1.59 Tetraclita rubescens 5.6 1.2 1.0 2.4 2.55 2.13 Ch/orostoma brunnea 0.6 - 5.0 3.2 2.20 2.33 Anthopleura elegantissima 2.4 1.0 0.8 1.2 1.35 0.72 Lottia limatu/a 0.2 3.8 1.2 . 1.30 1.75 Lottia pelta 0.4 - 3.2 1.2 1.20 1.42 Epiactis prolifera 0.4 0.6 2.6 0.6 1.05 1.04 Lottiidae 1.8 0.6 1.0 0.6 1.00 0.57 Ocinebrina spp. 1.4 1.2 0.6 0.8 1.00 0.37 Fissure/la volcano 1.0 0.4 0.2 1.6 0.80 0.63 Lacuna spp. 0.8 0.2 1.0 0.6 0.65 0.34 Crepidula spp. 0.4 0.6 0.2 0.8 0.50 0.26 Lottia scutum 0.6 0.2 0.4 0.2 0.35 0.19 Nemertea 0.2 . 0.6 0.6 0.35 0.30 Pugettia spp. - 0.2 0.2 1.0 0.35 0.44 lschnochitonidae 0.2 - 0.4 0.4 0.25 0.1 9 Leptasterias spp. - - 0.2 0.8 0.25 0.38 Grapsidae - 0.4 0.2 - 0.15 0.19 Nereididae - 0.2 0.2 0.2 0.15 0.10 Serpulidae - 0.4 - 0.2 0.15 0.19 Pachygrapsus crassipes - - - 0.6 0.1 5 0.30 Acmaea mitra 0.2 - 0.2 - 0.10 0.12 Cyanoplax spp. - 0.4 - 0.10 0.20 Lepidozona spp. - - - 0.4 0.10 0.20 Lirobittium spp. - 0.2 - 0.2 0.1 0 0.12 Ophiactis simplex - - 0.2 0.2 0.10 0.12 Pycnogonida - 0.2 - 0.2 0.10 0.12 Roma/eon antennarius - - 0.4 - 0.10 0.20 Sipuncula 0.2 - 0.2 - 0.10 0.12 Amphiodia occidenta/is 0.2 - - - 0.05 0.10 Barleeia spp. - 0.2 - - 0.05 0.10 Cal/iostoma ligatum - - 0.2 - 0.05 0.10 Diodora spp. - - - 0.2 0.05 0.10 Epitonium!Opa/ia spp. - - - 0.2 0.05 0.10 Heptacarpus spp. - - - 0.2 0.05 0.10 Hermissenda crassicomis - - 0.2 - 0.05 0.10 Homolopoma /uridum/Lirularia succincta - - 0.2 - 0.05 0.10 lsopoda - - - 0.2 0.05 0.10 Mitra idae - - - 0.2 0.05 0.10 Mopa/iaspp. - - - 0.2 0.05 0.10 Patiria miniata - - 0.2 - 0.05 0.10 Pelecypoda boring - - 0.2 - 0.05 0.10 Pisaster/Henricia spp. Uuv.) - 0.2 - - 0.05 0.10 Pseudomelatoma torosa 0.2 - - - 0.05 0.10 (table continued) t' ESLO2021-02 C-6

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C3 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Control Station NC 2+0.3m (2+ 1).

Survey 200 201 202 203 Survey Date 05-Feb-20 13-Apr-20 20-Jul-20 02-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Pista spp. 9.8 7.8 9.4 8.7 8.92 0.89 tunicates, compound/social <0.1 0.2 0.1 <0.1 0.11 0.09 Porifera (encrusting) <0. 1 <0.1 <0.1 <0. 1 0.02 0.03 Phragmatopoma ca/ifornica <0.1 <0. 1 <0.1 <0.1 0.01 <0.01 Spirorbidae <0. 1 <0. 1 <0.1 <0.1 0.01 <0.01 Chthamalus fissus <0.1 <0. 1 <0.1 <0.1 <0.01 <0.01 Bryozoa (encrusting) <0. 1 <0. 1 <0. 1 <0. 1 <0.01 <0.01 Salmacina tribranchiata <0. 1 <0.1 <0.1 <0.1 <0.01 <0.01 Substrate Cover rock 10.3 9.4 4.4 5.3 7.33 2.93 cobble 4.9 4.4 4.4 1.5 3.82 1.55 sand (shell oravell 1.3 5.3 2.1 4.1 3.22 1.84 C' ESLO2021-02 C-7

Appendix C - Intertidal Algae, Invertebrates and Substrates Ta ble C4. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Control Station NC 2+0.9m (2+3).

Survey 200 201 202 203 Survey Date 05-Feb-20 13-Apr-20 20-Jul-20 02-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 39.2 27.5 30.0 43.3 35.00 7.47 Endocladia muricata 28.5 34.4 32.9 31.0 31.72 2.57 Mastocarpus papillatus 2.6 4.0 13.9 7.6 7.00 5.06 coralline crust 6.5 4.5 4.0 3.1 4.53 1.41 Corallina vancouveriensis 1.6 0.7 2.6 1.2 1.51 0.80 Mazzael/a flaccida 0.1 0.3 3.0 1.7 1.29 1.34 Mastocarpus jardinii <0.1 0.3 1.0 2.6 0.97 1.15 juv. articulated coralline algae 0.8 0.8 0.8 0.1 0.64 0.34 Calliarthron/Bossiel/a spp.-complex 1.1 0.5 <0.1 0.5 0.54 0.43 Ge/idium cou/teri <0.1 <0.1 0.2 0.6 0.23 0.28 Prionitis spp. <0.1 <0.1 <0.1 0.2 0.09 0.09 Porphyra spp. - <0.1 0.3 <0.1 0.07 0.14 Mazzael/a /eptorhynchos - <0.1 <0.1 <0.1 0.02 0.03 Mazzael/a affinis - <0.1 <0.1 - 0.02 0.03 Corallina chi/ensis <0.1 - - - 0.02 0.03 Grateloupia californica - - <0.1 - 0.02 0.03 Gelidium pusillum <0.1 <0.1 <0.1 <0.1 0.01 <0.01 C/adophora spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Chondracanthus canaliculatus <0.1 <0.1 <0. 1 - <0.01 <0.01 Cumagloia andersonii - - <0.1 - <0.01 <0.01 Chlorophyta (filamentous) - <0.1 - - <0.01 <0.01 Mazzael/a oregona - - <0.1 - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 117.0 79.2 97.4 52.4 86.50 27.48 Anthop/eura e/egantissima 8.2 12.2 6.0 7.6 8.50 2.64 Lottia scabra 2.6 9.0 6.8 6.4 6.20 2.66 Lottia limatu/a 1.6 2.0 3.0 1.8 2.10 0.62 Ocinebrina spp. 3.0 1.6 1.2 1.4 1.80 0.82 Pagurus spp. 1.2 1.8 2.4 1.4 1.70 0.53 Lottiidae 1.4 1.0 1.6 1.2 1.30 0.26 Mopalia spp. 1.4 1.0 0.2 0.6 0.80 \

0.52 Lottia scutum 0.4 0.4 1.0 1.2 0.75 0.41 Lottia pefta 1.4 0.2 1.2 - 0.70 0.70 Pachygrapsus crassipes - 0.6 1.2 1.0 0.70 0.53 Serpulidae 0.4 0.4 - 0.4 0.30 0.20 Littorina scutu/ata 1.0 0.2 - - 0.30 0.48 Nuttallina ca/ifornica 0.2 1.0 - - 0.30 0.48 Grapsidae - 0.4 0.6 - 0.25 0.30 Leptasterias spp. - 0.2 0.8 - 0.25 0.38 Cyanop/ax spp. 0.2 0.2 0.4 - 0.20 0.16 Littorina spp. - 0.4 - 0.4 0.20 0.23 Myti/us spp. 0.2 0.2 0.2 0.2 0.20 <0.01 Crepidu/a spp. 0.2 - 0.4 - 0.15 0.19 Hemigrapsus nudus 0.2 0.2 0.2 - 0.15 0.10 Tetraclita rubescens - 0.6 - - 0.1 5 0.30 (table continued)

C' ESLO2021-02 C-8

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C4 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Control Station NC 2+0.9m (2+3).

Survey 200 201 202 203 Survey Date 05-Feb-20 13-Apr-20 20-Jul-20 02-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Lottia gigantea . 0.2 0.2 . 0.10 0.12 Acanthinucella spp. . . - 0.2 0.05 0.10 Calliostoma ligatum - 0.2 - - 0.05 0.10 Fissurellidea bimaculata 0.2 - - - 0.05 0.10 Nemertea - - - 0.2 0.05 0.10 Invertebrate Cover Chthamalus fissus 0.3 0.1 0.3 0.1 0.22 0.08 Phragmatopoma californica <0.1 0.1 <0.1 0.3 0.13 0.12 Ha/iclona spp. <0.1 <0.1 <0.1 0.2 0.05 0.10 Spirorbidae 0.1 <0.1 <0.1 <0.1 0.04 0.07 Sa/macina tribranchiata <0.1 - <0.1 - <0.01 <0.01 tunicates, compound/social <0.1 <0.1 - - <0.01 <0.01 Pis/a spp. <0.1 - - - <0.01 <0.01 Substrate Cover rock 14.5 21 .7 15.8 8.6 15.16 5.38 cobble 11.0 11.7 9.0 8.1 9.93 1.71 sand (shell Qravel) <0.1 0.5 0.1 0.2 0.21 0.20 t' ESLO2021-02 C-9

Appendi x C - Intertidal Algae, Invertebrates and Substrates Table CS. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 1+0.3m (4+1).

Survey 200 201 202 203 Survey Date 07-Jan-20 02-Apr-20 19-Aug-20 19-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 30.8 24.0 17.7 29.7 25.56 6.04 Corallina vancouveriensis 20.5 24.9 13.8 18.0 19.31 4.65 Egregia menziesii 14.7 8.8 29.4 12.4 16.30 9.09 juv. articulated coralline algae 5.2 4.5 11 .6 10.6 7.99 3.64 Phyllospadix spp. 5.8 4.8 10.5 9.4 7.60 2.75 coralline crust 7.7 7.2 6.0 9.0 7.45 1.24 Cryptopleura violacea <0.1 0.6 5.5 4.9 2.78 2.82 Chondracanthus canaliculatus 1.6 0.7 4.4 1.2 1.96 1.65 Gelidium coulteri 0.3 0.5 5.8 0.6 1.81 2.69 Colpomenia spp. <0.1 0.5 3.1 0.6 1.04 1.41 Prionitis spp. 1.1 1.5 1.0 0.1 0.94 0.56 Gastroclonium subarticulatum 0.3 0.2 2.4 0.8 0.92 1.04 Ulva spp. - <0.1 2.9 <0.1 0.75 1.45 Calliarthron!Bossiella spp.-complex 1.4 0.6 0.6 0.4 0.73 0.44 Endocladia muricata 0.4 0.6 0.7 <0.1 0.43 0.27 filamentous red algae complex - <0.1 1.1 <0.1 0.31 0.53 Osmundea spp. <0.1 0.4 0.2 0.2 0.21 0.11 Cystoseira osmundacea - 0.2 0.4 0.2 0.21 0.17 Codium fragile subsp. californicum <0.1 0.2 <0.1 0.4 0.16 0.20 Smithora naiadum <0.1 <0.1 0.5 - 0.12 0.24 Corallina chilensis 0.4 <0.1 - <0.1 0.11 0.21 Macrocystis pyrifera - 0.3 <0.1 - 0.10 0.17 Sarcodiotheca gaudichaudii <0.1 0.2 <0.1 <0.1 0.09 0.09 Cladophora spp. - <0.1 0.3 <0.1 0.07 0.14 Chondracanthus corymbiferus - - <0.1 0.2 0.07 0.10 Mastocarpus papilla/us <0.1 <0.1 0.1 <0.1 0.06 0.07 Chlorophyta (filamentous) - - 0.1 - 0.04 0.07 Gelidium pusillum 0.1 - - <0.1 0.04 0.07 Chrysophyta - <0.1 0.1 - 0.04 0.07 Callithamnion spp./Pleonosporium spp. - <0.1 0.1 - 0.03 0.07 Scytosiphon spp. - - 0.1 - 0.03 0.07 Mazzaella affinis - - <0.1 <0.1 0.02 0.04 Laminariales - <0.1 <0.1 - 0.02 0.04 Endarachne!Petalonia spp.-complex - - <0.1 - 0.02 0.04 Melobesia mediocris <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Mazzaella flaccida <0.1 - <0.1 - <0.01 <0.01 Mauael/a leptorhynchos - - <0.1 - <0.01 <0.01 Bryopsis spp. - - <0.1 <0.1 <0.01 <0.01 Porphyra spp. - - <0.1 - <0.01 <0.01 Rhodophyta (juv. blades) - <0.1 - - <0.01 <0.01 Callithamnion pikeanum <0.1 - - - <0.01 <0.01 Mastocarpus jardinii <0.1 - - - <0.01 <0.01 Mazzaella solendens - - <0.1 - <0.01 <0.01 (table continued) t' ESLO2021 -02 C-10

Appendix C - Intertidal Algae, Invertebrates and Substrates Table CS (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 1+0.3 m (4+1).

Survey 200 201 202 203 Survey Date 07-Jan-20 02-Apr-20 19-Aug-20 19-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Lottia scabra 60.4 85.0 44.6 39.0 57.25 20.60 Chlorostoma funebralis 37.8 50.8 14.8 32.8 34.05 14.91 Tetraclita rubescens 33.6 43.4 38.4 11.0 31 .60 14.30 Strongylocentrotus purpuratus 12.8 22.2 24.2 17.8 19.25 5.06 Lottia limatula 6.4 14.0 15.2 21.0 14.15 6.00 Nuttallina californica 3.8 15.6 4.4 16.8 10.15 7.01 Serpulidae 1.2 5.4 9.0 4.6 5.05 3.20 Pagurus spp. 5.6 6.8 2.4 3.8 4.65 1.94 Anthopleura elegantissima 6.6 2.8 3.4 5.6 4.60 1.80 Lottia pelta 2.2 3.4 3.6 6.4 3.90 1.78 Lottia scutum 6.0 2.8 6.0 0.2 3.75 2.81 Mytilus spp. 5.4 3.6 2.6 2.6 3.55 1.32 Pachygrapsus crassipes 3.6 0.8 6.2 3.0 3.40 2.22 Chlorostoma brunnea 0.8 - 5.8 5.0 2.90 2.92 Fissure/la volcano 2.8 1.4 0.8 2.2 1.80 0.88 Mopalia spp. 1.4 1.4 0.6 2.0 1.35 0.57 Epiactis prolifera 1.6 0.6 1.6 1.4 1.30 0.48 Lottiidae 1.4 1.4 1.2 1.2 1.30 0.12 Sipuncula - 0.2 2.0 10 0.80 0.91 Acmaea mitra 0.8 0.6 0.6 1.0 0.75 0.19 Leptasterias spp. 0.8 - 1.4 0.6 0.70 0.58 Serpulorbis squamigerus 0.8 0.6 1.0 0.4 0.70 0.26 Ocinebrina spp. 1.2 0.4 0.6 0.4 0.65 0.38 Cyanoplax spp. 0.2 - 1.6 0.6 0.60 0.71 Lottia gigantea 1.0 0.6 0.6 0.2 0.60 0.33 Nemertea 0.2 - 1.8 0.2 0.55 0.84 Lacuna spp. 0.2 - 0.2 0.4 0.20 0.16 Lottia insessa 0.4 0.2 - 0.2 0.20 0.16 Grapsidae 0.2 0.2 0.2 - 0.15 0.10 Heptacarpus spp. 0.2 - 0.2 0.2 0.15 0.10 lschnochitonidae 0.4 - - 0.2 0.15 0.19 Pugettia spp. 0.2 - 0.2 0.2 0.15 0.10 Nereididae - 0.2 0.2 - 0.10 0.12 Pelecypoda boring 0.2 - - 0.2 0.10 0.12 Triopha spp. - - 0.4 - 0.10 0.20 Crepidula spp. - - 0.2 - 0.05 0.10 Epifonium!Opalia spp. 0.2 - - - 0.05 0.10 ldotea spp. - - 0.2 - 0.05 0.10 Lirobittium spp. - 0.2 - - 0.05 0.10 Lottia instabilis - - 0.2 - 0.05 0.10 Lottia ochracea - 0.2 - - 0.05 0.10 Octopus spp. 0.2 - - - 0.05 0.10 Phidiana hiltoni 0.2 - - - 0.05 0.10 Placiphorel/a vela/a - - 0.2 - 0.05 0.10 Pseudomelatoma torosa - - 0.2 - 0.05 0.10 Sabellidae - 0.2 - - 0.05 0.10 Tonicella lineata 0.2 - - - 0.05 0.10 (table continued) c, ESLO2021-02 C-11

Appendix C - Intertidal Algae, Invertebrates and Substrates Table CS (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC l+0.3m ( 4+ 1).

Survey 200 201 202 203 Survey Date 07-Jan-20 02-Apr-20 19-Aug-20 19-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Phragmatopoma ca/ifornica 7.7 2.6 5.6 7.3 5.80 2.33 Pis/a spp. 0.6 1.5 4.0 1.8 1.98 1.45 Bryozoa (encrusting) <0. 1 - <0.1 0.1 0.04 0.07 Chthamalus fissus <0.1 <0.1 <0.1 <0. 1 0.01 <0.01 Spirorbidae <0.1 - <0.1 <0.1 <0.01 <0.01 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Salmacina lribranchiata <0. 1 <0.1 - <0.1 <0.01 <0.01 Oodecaceria fewkesi - <0.1 - - <0.01 <0.01 Hydroidolina <0. 1 - - - <0.01 <0.01 Substrate Cover ->

rock 21.7 32.1 24.4 19.7 24.46 5.43 sand (shell gravel) 0.7 0.6 0.6 1.2 0.78 0.27 cobble 0.8 0.9 0.3 <0. 1 0.49 0.42 c, ESLO2021 -02 C-12

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C6. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 1+0.9m (4+3) .

Survey 200 201 202 203 Survey Date 07-Jan-20 02-Apr-20 19-Aug-20 19-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Endocladia murica/a 13.3 10.6 13.4 13.3 12.64 1.39 non-coralline crust 14.2 7.9 10.6 11.2 10.97 2.56 coralline crust 1.6 0.9 1.3 1.0 1.18 0.32 juv. articulated coralline algae 0.2 0.8 1.0 0.7 0.66 0.32 Cal/iarthron!Bossiella spp.-complex 0.6 0.6 0.4 0.9 0.63 0.20 Corallina vancouveriensis 0.3 0.8 0.1 0.4 0.42 0.26 Mastocarpus papilla/us 0.1 0.1 0.5 0.4 0.28 0.17 Si/vetia compressa 0.4 <0.1 - 0.2 0.17 0.18 Ge/idium cou/teri - <0.1 0.1 <0.1 0.04 0.07 Phyllospadix spp. <0.1 - <0.1 - 0.02 0.03 C/adophora spp. <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Gelidium pusil/um - <0.1 <0.1 <0.1 0.01 <0.01 Chondracanthus canalicu/atus - - <0.1 - <0.01 <0.01 Mazzael/a affinis - <0.1 <0.1 <0.1 <0.01 <0.01 Mazzael/a /eptorhynchos - - <0.1 - <0.01 <0.01 Mazzael/a f/accida - - <0.1 - <0.01 <0.01 Chlorophyta (filamentous) - - <0.1 - <0.01 <0.01 Porphyra spp. - - <0.1 - <0.01 <0.01 Smithora naiadum - - <0.1 - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 110.2 86.0 231 .2 244.8 168.05 81 .56 Anlhopleura elegantissima 209.0 149.4 109.8 164.8 158.25 41 .00 Lottia scabra 79.4 77.8 54.0 71 .6 70.70 11 .63 Pagurus spp. 14.0 7.2 7.0 12.4 10.15 3.58 Lottia limatu/a 5.0 4.0 7.8 12.8 7.40 3.94 Lottia pet/a 3.8 1.4 1.2 2.4 2.20 1.19 Lottiidae 6.0 0.4 0.6 1.0 2.00 2.68 Epiaclis prolifera - 6.2 - - 1.55 3.10 Cyanoplax spp. 0.4 0.6 0.8 4.2 1.50 1.81 Acanlhinucel/a spp. 1.4 1.2 1.0 2.2 1.45 0.53 Lol/ia scu/um 4.8 0.4 - - 1.30 2.34 Mopa/ia spp. 0.6 0.2 1.6 1.6 1.00 0.71 Ocinebrina spp. 0.6 - 0.4 2.0 0.75 0.87 Serpulidae 0.6 1.4 0.6 - 0.65 0.57 Pachygrapsus crassipes 0.4 0.8 - 1.0 0.55 0.44 Mytilus spp. - 0.8 - 1.0 0.45 0.53 Nullallina californica 0.6 0.2 0.4 0.2 0.35 0.19 Cirratulidae/T erebellidae 0.4 - 0.4 0.2 0.25 0.19 Epitonium!Opalia spp. - - 0.8 0.2 0.25 0.38 Lillorina scutulata 0.4 0.4 - - 0.20 0.23 Strongylocenlro/us purpuralus 0.4 0.2 - 0.2 0.20 0.16 Sipuncula - - - 0.6 0.15 0.30 Nemertea - - - 0.4 0.10 0.20 Fissure/la volcano - 0.2 - - 0.05 0.10 (table continued)

~ ESLO2021 -02 C-13

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C6 (continued) . Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC l +0.9m (4+3).

Survey 200 201 202 203 Survey Date 07-Jan-20 02-Apr-20 19-Aug-20 19-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Ha!iotis spp. 0.1 0.1 - - 0.05 0.06 Lirobittium spp. - - - 0.2 0.05 0.10 Littorina spp. - - 0.2 - 0.05 0.10 Invertebrate Cover Chthamalus fissus 3.6 3.8 3.5 2.0 3.22 0.81 Phragmatopoma californica 4.4 2.4 1.8 2.8 2.83 1.10 Porifera (encrusting) - - - <0. 1 <0.01 <0.01 Spirorbidae - <0. 1 - - <0.01 <0.01 Substrate Cover rock 47.4 62.2 64.5 53.6 56.93 7.92 sand (shell gravel) 8.1 2.2 0.1 4.2 3.67 3.41 cobble 3.9 5.8 1.5 2.9 3.54 1.81 C' ESLO2021-02 C-14

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C7. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 2+0.3m (5+1).

Survey 200 201 202 203 Survey Date 14-Jan-20 06-Apr-20 04-Aug-20 01-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 16.7 17.0 12.6 20.8 16.81 3.35 Corallina vancouveriensis 16.7 19.9 4.3 22.6 15.87 8.07 juv. articulated coralline algae 7.7 6.1 14.8 5.3 8.47 4.33 Egregia menziesii 6.4 5.4 14.5 5.3 7.90 4.44 coralline crust 11 .7 6.2 7.6 3.3 7.21 3.49 Phyl/ospadix spp. 5.8 4.9 4.9 5.2 5.19 0.41 Cal/iarthron!Bossiella spp.-complex 2.4 4.4 5.4 4.9 4.27 1.30 Gelidium coulteri 1.3 0.6 5.4 0.7 2.02 2.29 Prionitis spp. 0.9 0.8 1.8 1.7 1.30 0.55 Chrysophyta . <0.1 5.1 . 1.30 2.56 Cryptopleura violacea <0.1 0.2 1.8 1.3 0.84 0.83 filamentous red algae complex - <0.1 2.8 - 0.71 1.38 Endoc/adia muricata 0.7 0.8 0.5 0.8 0.69 0.15 Codium fragile subsp. califomicum 0.2 0.8 0.8 0.2 0.50 0.34 Chondracanthus canaliculatus <0.1 <0.1 0.7 0.6 0.35 0.36 C/adophora spp. <0.1 <0.1 1.2 <0.1 0.30 0.59 Ulva spp. - - 0.8 <0.1 0.21 0.42 Smithora naiadum - <0.1 0.8 - 0.21 0.42 Cora/Jina chilensis 0.1 0.1 0.3 <0.1 0.16 0.09 Gastroclonium subarticu/atum - <0.1 0.3 <0.1 0.09 0.13 Colpomenia spp. - <0.1 0.2 <0.1 0.07 0.10 Mastocarpus papilla/us <0.1 <0.1 0.2 <0.1 0.06 0.11 Mazzaella splendens - - 0.2 - 0.05 0.10 Sargassum muticum - 0.2 - - 0.05 0.10 Chlorophyta (filamentous) - <0.1 0.1 - 0.04 0.07 Mazzaella affinis - <0.1 0.1 - 0.03 0.07 Laminariales <0.1 <0.1 - - 0.03 0.04 Sarcodiotheca gaudichaudii - <0.1 <0.1 <0.1 0.02 0.03 Mazzael/a f/accida - - <0.1 - 0.02 0.04 Scytosiphon spp. - - <0.1 - 0.02 0.04 Macrocystis pyrifera - - <0.1 - 0.02 0.03 Gelidium pusillum <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Melobesia mediocris <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Chondracanthus corymbiferus - - <0.1 <0.1 <0.01 <0.01 Cal/ithamnion spp.!Pleonosporium spp. <0.1 - - <0.1 <0.01 <0.01 Endarachne!Petalonia spp.-complex - - <0.1 - <0.01 <0.01 Mazzael/a leptorhynchos - <0.1 <0.1 - <0.01 <0.01 P/erosiphonia dendroidea - <0.1 - - <0.01 <0.01 Cal/ophyllis spp. - - <0.1 - <0.01 <0.01 Osmundea spp. - - <0.1 - <0.01 <0.01 Porphyra spp. - - <0.1 - <0.01 <0.01 Rhodophvta /iuv. blades) - <0.1 - - <0.01 <0.01 (table continued) t' ESLO2021-02 C-15

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C7 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 2+0.3m (5+ 1).

Survey 200 201 202 203 Survey Date 14-Jan-20 06-Apr-20 04-Aug-20 01-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Mytilus spp. 139.8 132.0 161 .4 96.0 132.30 27.21 Chlorostoma funebralis 76.2 37.0 131.6 50.0 73.70 41 .90 Strongy/ocenlrolus purpuratus 48.4 41 .0 40.8 21 .4 37.90 11 .55 Lotlia scabra 27.4 52.8 32.6 32.2 36.25 11.28 Tetraclita rubescens 27.4 33.6 33.4 17.4 27.95 7.60 Anthop/eura e/egantissima 9.2 11.2 22.4 13.4 14.05 5.82 Lottia limatula 4.0 6.0 10.0 13.4 8.35 4.19 Nuttallina ca/ifomica 7.8 3.2 9.2 8.2 7.10 2.67 Lottia pelta 4.6 5.2 6.4 0.8 4.25 2.42 Fissure/la volcano 3.8 1.6 2.4 4.6 3.10 135 Ba/anus spp. 3.0 - 1.2 6.8 2.75 2.97 Serpulidae 1.0 1.6 4.4 0.8 1.95 1.67 Pachygrapsus crassipes 3.2 0.2 3.2 0.6 1.80 1.62 Lotliidae 2.2 1.0 1.4 0.8 1.35 0.62 Nemertea 0.8 0.2 4.4 - 1.35 2.06 Ocinebrina spp. 0.6 0.2 1.2 1.8 0.95 0.70 Lotlia scutum 0.8 1.2 0.6 0.6 0.80 0.28 Pagurus spp. 0.8 0.2 2.0 - 0.75 0.90 Sipuncula 0.8 0.2 1.0 0.8 0.70 0.35 Nereididae - 0.2 2.2 - 0.60 1.07 Acmaea mitra 0.6 1.0 0.4 0.4 0.60 0.28 Lottia gigantea 0.4 0.4 0.6 0.6 0.50 0.12 Leptasterias spp. 0.2 0.2 0.6 0.6 0.40 0.23 Mopalia spp. 0.4 0.2 0.4 - 0.25 0.19 Cyanoplax spp. 0.2 - 0.4 0.2 0.20 0.16 Epiactis prolifera - 0.2 0.4 - 0.15 0.19 Serpulorbis squamigerus 0.2 0.2 0.2 - 0.15 0.10 Anthopleura artemisia 0.4 - - - 0.10 0.20 Chlorostoma brunnea - - 0.4 - 0.10 0.20 Crepidu/a spp. 0.2 - 0.2 - 0.10 0.12 Grapsidae - - 0.4 - 0.10 0.20 Lacuna spp. 0.2 - - 0.2 0.10 0.12 Pelecypoda boring - 0.2 - 0.2 0.10 0.12 Epitonium!Opalia spp. - - 0.2 - 0.05 0.10 Homolopoma luridum!Lirularia succincta - - 0.2 - 0.05 0.10 lschnochitonidae 0.2 - - - 0.05 0.10 Lirobitlium spp. - - 0.2 - 0.05 0.10 Litlorina spp. - - 0.2 - 0.05 0.10 Lotlia insessa 0.2 - - - 0.05 0.10 Lottia ochracea 0.2 - - - 0.05 0.10 Platyhelminthes - - 0.2 - 0.05 0.10 (table continued) t' ESLO2021-02 C-16

Appendix C - Intertidal Algae , Invertebrates and Substrates Ta ble C7 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 2+0.3m (5+1).

Survey 200 201 202 203 Survey Date 14-Jan-20 06-Apr-20 04-Aug-20 01 -Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Phragmatopoma californica 5.3 0.8 <0.1 3.6 2.45 2.46 Pis/a spp. 0.2 0.7 0.3 1.2 0.59 0.45 Chthamalus fissus 0.4 <0.1 0.2 0.3 0.23 0.12 Dodecaceria fewkesi <0.1 <0.1 0.2 0.1 0.09 0.10 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 0.02 0.03 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <001 Sa!macina tribranchiata <0.1 <0.1 <0.1 - <0.01 <001 Ha!iclona spp. - - - <0.1 <0.01 <0.01 Substrate Cover rock 30.2 29.7 23.5 25.1 27.15 3.32 sand (shell gravel) 1.1 1.9 1.7 2.1 1.72 0.43 cobble 1.0 1.4 0.6 0.4 0.87 0.43 c, ESLO2021 -02 C-17 L

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C8. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 2+0.9m (5+3).

Survey 200 201 202 203 Survey Date 14-Jan-20 06-Apr-20 04-Aug-20 01-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Endoc/adia muricata 20.8 30.6 27.9 27.5 26.70 4.19 non-coralline crust 17.4 11.0 13.0 16.2 14.38 2.93 Mastocarpus papilla/us 1.0 0.2 4.1 1.0 1.58 1.72 juv. articulated coralline algae <0.1 <0.1 0.2 <0. 1 0.07 0.10 Prionitis spp. 0.1 <0.1 <0.1 - 0.05 0.07 Silvetia compressa - - 0.2 - 0.05 0.10 coralline crust <0.1 <0.1 <0.1 <0.1 0.04 0.04 Gelidium cou/teri <0.1 - 0.1 - 0.04 0.07 Mastocarpus jardinii 0.1 <0.1 - - 0.04 0.07 C/adophora spp. <0.1 <0.1 <0.1 <0.1 0.02 0.04 Corallina vancouveriensis <0.1 <0.1 <0.1 - 0.02 0.03 Mazzaella leptorhynchos - - <0.1 - 0.02 0.04 Ge/idium pusil/um <0. 1 <0. 1 <0. 1 <0. 1 0.01 <0.01 Mazzaella affinis <0.1 - <0.1 <0.1 <0.01 <0.01 Mazzael/a flaccida - - <0.1 - <0.01 <0.01 Porphyra spp. - - <0.1 - <0.01 <0.01 Gastroclonium subarticulatum - - - <0.1 <0.01 <0.01 Phyl/ospadix spp. <0.1 - - - <0.01 <0.01 Invertebrate Counts Chlorostoma funebralis 126.6 36.2 127.8 62.0 88.15 46.31 Anthopleura e/egan/issima 31.0 41.8 26.2 24.6 30.90 7.76 Lottia scabra 18.8 23.4 31.2 24.2 24.40 5.12 Lottia lima/ula 3.4 2.6 8.4 7.8 5.55 2.97 Lottiidae 1.6 1.0 3.8 1.0 1.85 1.33 Lottia pelta 2.2 0.8 1.8 0.6 1.35 0.77 Pagurus spp. 1.2 1.4 0.6 0.4 0.90 0.48 Cyanoplax spp. 0.6 0.6 1.4 0.6 0.80 0.40 Lottia scutum 1.6 - 0.6 - 0.55 0.75 Acanthinucel/a spp. 0.8 - 0.2 1.0 0.50 0.48 Ocinebrina spp. 0.2 - 0.6 0.6 0.35 0.30 Littorina scululata 0.6 0.4 - - 0.25 0.30 Lit/orina spp. - - 0.6 0.4 0.25 0.30 Lottia gigantea 0.4 0.4 - 0.2 0.25 0.19 Myti/us spp. - 0.4 0.4 0.2 0.25 0.19 Pachygrapsus crassipes 0.2 0.4 0.2 0.2 0.25 0.10 Pol/icipes polymerus 0.2 0.2 0.2 0.4 0.25 0.10 lschnochitonidae 0.2 0.2 0.2 - 0.15 0.10 Nemertea 0.4 - - 0.2 0.15 0.19 CirratulidaefT erebellidae 0.2 - - 0.2 0.10 0.12 Epitonium/Opalia spp. - - 0.4 - 0.10 0.20 Mopa/iaspp. - - 0.4 - 0.10 0.20 Fissure/la volcano 0.2 - - - 0.05 0.10 Grapsidae - 0.2 - - 0.05 0.10 Nut/a/Jina californica 0.2 - - - 0.05 0.10 Ophiothrix spiculata - - 0.2 - 0.05 0.10 (table continued)

~ ESLO2021-02 C-18

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C8 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 2+0.9m (5+3).

Survey 200 201 202 203 Survey Date 14-Jan-20 06-Apr-20 04-Aug-20 01-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Pelecypoda boring - 0.2 - 0.05 0.10 Septifer bifurcatus - - 0.2 - 0.05 0.10 Tetraclita rubescens - - - 0.2 0.05 0.10 Invertebrate Cover Phragmatopoma californica 1.1 0.4 0.7 0.5 0.66 0.33 Chthamalus fissus 0.1 0.1 0.4 1.3 0.49 0.56 Spirorbidae <0.1 - - - <0.01 <0.01 Substrate Cover rock 54.6 53.8 55.8 51 .9 54.03 1.60 sand (shell gravel) 4.6 5.4 1.0 2.4 3.35 2.01 cobble 1.2 <0.1 0.8 0.7 0.70 0.46

~ ESLO2021 -02 C-19 L

Appendi x C - Intertidal Algae , Invertebrates and Substrates Table C9. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 3+0.3m (6+ 1).

Survey 200 201 202 203 Survey Date 11-Feb-20 03-Apr-20 24-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 32.3 29.9 25.0 29.8 29.24 3.05 Phyl/ospadix spp. 13.1 10.6 12.9 14.0 12.64 1.42 coralline crust 9.9 7.6 6.5 5.1 7.27 2.02 Corallina vancouveriensis 6.6 5.5 4.2 9.2 6.37 2.10 juv. articulated coralline algae 5.5 7.1 3.1 4.8 5.12 1.64 Gelidium coulteri 1.7 2.1 5.3 0.5 2.38 2.05 Egregia menziesii 1.3 1.2 4.5 0.8 1.96 1.71 Gastroclonium subarticu/atum 0.8 1.9 2.0 1.3 1.51 0.54 Chrysophyta 0.5 . 4.2 . 1.16 2.02 filamentous red algae complex . . 3.7 . 0.92 1.84 Cal/iarthron/Bossiel/a spp.-complex 1.0 0.9 0.9 0.4 0.82 0.27 Mazzael/a f/accida . . 2.8 . 0.70 1.39 Smithora naiadum . <0.1 2.7 <0.1 0.68 1.35 Ge/idium pusillum . 0.2 1.6 <0.1 0.46 0.77 Mastocarpus papilla/us 0.7 <0.1 0.5 0.4 0.39 0.29 U/va spp. <0.1 <0.1 1.3 0.2 0.37 0.60 Chondracanthus canaliculatus 0.3 <0.1 0.6 0.5 0.33 0.25 Prionitis spp. 0.3 0.3 0.5 0.2 0.32 0.12 Endocladia muricata 0.2 0.3 0.3 0.4 0.31 0.09 Cryptopleura violacea 0.3 0.1 0.3 0.3 0.26 0.09 C/adophora spp. <0.1 <0.1 0.5 <0.1 0.15 0.23 Codium fragile subsp. californicum 0.1 <0.1 0.3 <0.1 0.14 0.15 Co/pomenia spp. <0.1 <0.1 0.3 0.1 0.11 0.13 Chlorophyta (filamentous) . . 0.4 . 0.10 0.21 Macrocystis pyrifera . . 0.4 . 0.10 0.21 Sarcodiotheca gaudichaudii <0.1 . 0.2 . 0.05 0.10 Mazzaella affinis . . 0.1 <0.1 0.04 0.07 Mazzaella /eptorhynchos <0.1 . <0.1 . 0.02 0.04 Cystoseira osmundacea <0.1 <0. 1 . . 0.02 0.03 Corallina chi/ensis <0. 1 . . . 0.02 0.03 Mazzael/a oregona . . <0. 1 . 0.02 0.03 Me/obesia mediocris <0.1 <0.1 . <0.1 <0.01 <0.01 Laminariales <0.1 . <0.1 . <0.01 <0.01 Mastocarpus jardinii . . <0.1 . <0.01 <001 Ca/lithamnion spp.lP/eonosporium spp. . . <0.1 . <0.01 <0.01 Endarachne/Petalonia spp.-complex <0.1 . . . <0.01 <0.01 Grateloupia californica . . <0.1 - <0.01 <0.01 Halicystis ova/is (=Derbesia marina) <0.1 . - - <0.01 <0.01 Microc/adia cou/teri . . <0.1 . <0.01 <0.01 Osmundea spp. . . <0. 1 . <0.01 <0.01 Rhodymenia spp. <0.1 . . . <0.01 <0.01 Scvtosiohon soo. . . <0.1 . <0.01 <0.01 (table continued)

~ ESLO2021 -02 C-20

Append ix C - Intertidal Algae , Invertebrates and Substrates Table C9 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 3+0.3m (6+ 1).

Survey 200 201 202 203 Survey Date 11-Feb-20 03-Apr-20 24-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Myti/us spp. 78.4 36.6 60.8 40.4 54.05 19.40 Chlorostoma funebralis 19.6 45.6 73.2 38.6 44.25 22.21 Strongylocentrotus purpuratus 58.6 48.8 29.2 37.8 43.60 12.82 Tetraclita rubescens 25.8 39.8 31.2 45.6 35.60 8.81 Lottia scabra 7.6 12.8 30.4 13.4 16.05 9.91 Anthop/eura e/egantissima 11.6 9.6 7.6 12.8 10.40 2.29 Lottia /imatu/a 9.4 9.2 8.0 6.2 8.20 1.47 Pagurus spp. 6.2 5.2 12.8 1.6 6.45 4.67 Fissure/la volcano 3.8 5.8 6.0 3.8 4.85 1.22 Nuttallina californica 2.6 5.4 4.8 4.0 4.20 1.21 Lottia pelta 3.2 2.4 9.2 1.8 4.15 3.42 Serpulidae 2.0 4.6 3.0 5.2 3.70 1.47 Sipuncula 5.6 - 0.6 0.6 1.70 2.62 Ocinebrina spp. 1.6 1.6 2.0 0.8 1.50 0.50 Pachygrapsus crassipes 1.4 0.8 1.8 1.2 1.30 0.42 Lottiidae 1.2 0.6 1.6 1.0 1.10 0.42 Ba/anus spp. 1.0 - 2.4 0.8 1.05 1.00 Lottia scutum 0.4 - 1.2 2.2 0.95 0.97 Acmaea mitra 1.6 0.8 0.6 0.6 0.90 0.48 Nemertea 0.8 - 2.2 0.6 0.90 0.93 Chlorostoma brunnea - 2.4 - 0.2 0.65 1.17 Mopaliaspp. 0.4 0.8 0.6 0.8 0.65 0.19 Leptasterias spp. - 0.2 1.2 0.6 0.50 0.53 Serpulorbis squamigerus 0.4 0.8 0.4 0.4 0.50 0.20 Tonicella lineata 0.4 0.2 0.4 - 0.25 0.19 Acanthinucel/a spp. 0.4 0.2 0.2 - 0.20 0.16 Haliotis spp. 0.1 0.1 0.3 0.2 0.18 0.10 Lacuna spp. 0.2 - - 0.4 0.15 0.19 Lottia giganlea - 0.2 0.2 0.2 0.15 0.10 CirratulidaefT erebellidae - - 0.2 0.2 0.10 0.12 Cyanoplax spp. - - 0.2 0.2 0.10 0.12 Epitonium/Opalia spp. - - 0.4 - 0.10 0.20 Grapsidae - - 0.4 - 0.10 0.20 Pelecypoda boring - 0.2 - 0.2 0.10 0.12 Pseudome/atoma torosa - 0.2 0.2 - 0.10 0.12 Crepidula spp. - - 0.2 - 0.05 0.10 Homo/opoma /uridum/Lirularia succincta - 0.2 - - 0.05 0.10 Lissothuria nutriens - 0.2 - - 0.05 0.10 Littorina spp. 0.2 - - - 0.05 0.10 Nereididae - - 0.2 - 0.05 0.10 Pachycheles spp. - 0.2 - - 0.05 0.10 Pugettia spp_ - - 0.2 - 0.05 0.10 (table continued)

C' ESLO2021-02 C-21

Appendix C - Intertidal Algae, Inve rtebrates and Substrates Ta ble C9 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field' s Cove Station FC 3+0.3m (6+ 1).

Survey 200 201 202 203 Survey Date 11-Feb-20 03-Apr-20 24-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Phragmatopoma californica 13.3 11 .3 8.8 10.1 10.87 1.94 Pis/a spp. 4.4 4.6 4.7 4.9 4.64 0.23 Chthamalus fissus 0.6 0.8 0.4 0.4 0.56 0.17 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Bryozoa (encrusting) - <0.1 <0.1 <0.1 <0.01 <001 tunicates, compound/social - <0.1 <0.1 <0.1 <0.01 <0.01 Porifera (encrusting) <0. 1 <0.1 <0. 1 <0.1 <0.01 <0.01 Dodecaceria fewkesi - <0.1 <0.1 - <0.01 <0.01 Salmacina tribranchiata - <0.1 - <0.1 <0.01 <0.01 Hydroidolina - . - <0.1 <0.01 <0.01 Substrate Cover rock 19.2 22.6 18.8 19.0 19.88 1.85 sand (shell gravel) 2.6 0.1 <0.1 1.4 1.03 1.20 cobble 0.5 1.0 0.7 - 0.56 0.44

~ ESLO2021-02 C-22

Appendix C - Intertidal Algae , Invertebrates and Substrates Table ClO. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 3+0.9m (6+3).

Survey 200 201 202 203 Survey Date 11-Feb-20 03-Apr-20 24-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Endoc/adia muricata 16.3 14.9 23.3 18.5 18.26 3.65 non-coralline crust 19.8 12.8 15.1 21.9 17.41 4.20 Mastocarpus papilla/us 0.9 <0.1 5.6 0.8 1.83 2.56 Gelidium cou/teri 0.3 0.6 1.7 2.0 1.15 0.83 Mazzaella flaccida - - 4.1 - 1.03 2.05 coralline crust 1.7 0.8 0.4 0.8 0.91 0.55 Corallina vancouveriensis 0.8 0.7 0.1 <0.1 0.42 0.36 juv. articulated coralline algae 0.5 0.1 0.5 0.4 0.37 0.16 C/adophora spp. <0.1 <0.1 0.6 <0.1 0.16 0.31 Calliarthron!Bossiel/a spp.-complex 0.2 <0.1 - 0.1 0.10 0.09 Chondracanthus canaliculatus <0.1 <0.1 - 0.2 0.05 0.10 Mazzaella leptorhynchos <0.1 - 0.1 - 0.04 0.07 Gelidium pusillum <0.1 <0.1 <0.1 <0.1 0.03 0.04 Mazzael/a affinis <0.1 - <0.1 <0.1 0.02 0.04 Prionitis spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Mastocarpus jardinii <0.1 <0.1 - - <0.01 <0.01 Silvetia compressa <0.1 - - <0.1 <0.01 <0.01 Egregia menziesii <0.1 - - - <0.01 <0.01 Gastroclonium subarticu/atum <0.1 - - - <0.01 <0.01 Porphyra spp. - - <0.1 - <0.01 <0.01 U/va spp. - - - <0.1 <0.01 <0.01 Invertebrate Counts Lottia scabra 168.4 57.2 57.0 53.4 84.00 56.29 Ch/orostoma funebralis 105.8 41 .6 120.4 53.0 80.20 38.73 Anthopleura elegantissima 7.6 6.0 8.2 4.8 6.65 1.54 Lottia limatula 1.6 2.6 11 .6 4.6 5.10 4.51 Pagurus spp. 13.0 0.4 0.8 0.6 3.70 6.20 Nuttallina ca/ifomica 2.4 1.6 1.8 0.2 1.50 0.93 Lottia pet/a 2.4 0.4 1.6 1.2 1.40 0.83 Lottiidae 1.2 1.8 1.6 1.0 1.40 0.37 Ocinebrina spp. 1.4 0.6 1.2 2.0 1.30 0.58 Lottia scutum 0.2 1.8 - 0.6 0.65 0.81 Acanthinucel/a spp. 0.2 0.6 1.0 0.6 0.60 0.33 Cyanoplax spp. 0.6 - 1.6 0.2 0.60 0.71 Pachygrapsus crassipes - 0.2 0.8 0.6 0.40 0.37 Mopalia spp. 0.4 - 0.2 0.8 0.35 0.34 Littorina spp. 0.6 - 0.4 0.2 0.30 0.26 Nemertea 0.6 - - 0.2 0.20 0.28 Cirratulidae!T erebellidae - - 0.4 - 0.10 0.20 Fissure/la volcano 0.2 - 0.2 - 0.10 0.12 lschnochitonidae - - 0.2 0.2 0.10 0.12 Sipuncula - - - 0.4 0.10 0.20 Epitonium/Opalia spp. - - 0.2 - 0.05 0.10 Leptasterias spp. - - - 0.2 0.05 0.10 Littorina scutulata - 0.2 - - 0.05 0.10 (table continued)

C' ESLO2021-02 C-23

Appendix C - Intertidal Algae, Invertebrates and Substrates Table ClO (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for Field's Cove Station FC 3+0.9m (6+3).

Survey 200 201 202 203 Survey Date 11-Feb-20 03-Apr-20 24-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Nereididae 0.2 - - - 0.05 0.10 Strongy/ocentrotus purpuratus - 0.2 - - 0.05 0.10 Invertebrate Cover Chthamalus fissus 6.2 9.9 13.1 16.7 11 .46 4.50 Phragmatopoma californica 4.0 6.4 1.3 2.5 3.54 2.18 Spirorbidae - <0.1 - - <0.01 <0.01 Substrate Cover rock 49.5 55.8 44.0 39.3 47.14 7.11 sand (shell gravel) 2.2 1.8 - 1.8 1.46 0.99 cobble 0.1 - - <0.1 0.05 0.07

~ ESLO2021-02 C-24

Appendix C - Intertidal Algae, Inverteb rates and Substrates Ta ble CH. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC J+0.3 m (7+ 1).

Survey 200 201 202 203 Survey Date 24-Jan-20 08-Apr-20 17-Aug-20 17-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 31 .3 26.0 45.6 27.8 32,66 8.88 Codium fragile subsp. californicum 12.3 18.3 20.1 19.5 17.57 3.60 coralline crust 10.2 7.6 5.0 7.2 7.50 2.13 juv. articulated coralline algae 2.6 5.4 2.8 3.8 3.68 1.27 filamentous red algae complex 2.7 1.7 4.7 4.7 3.45 1.50 Corallina vancouveriensis 1.7 4.8 1.0 3.7 2,80 1.74 Acrosorium ciliolatum <0.1 - 0.2 1.6 0.45 0.77 Farlowia!Pikea spp.-complex <0.1 <0.1 0.3 0.7 0.26 0.31 Chrysophyta - 0.6 - - 0.1 6 0.31 Chlorophyta (filamentous) 0.1 0.3 <0.1 <0.1 0.13 0.12 Colpomenia spp. <0. 1 <0. 1 0.2 <0.1 0.07 0.10 Ulva spp. <0.1 - 0.2 <0.1 0.05 0.11 Prionitis spp. <0.1 <0.1 <0. 1 0.1 0.04 0,07 Pferosiphonia dendroidea <0. 1 <0.1 <0.1 <0.1 <0,01 <001 Bryopsis spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Calliarthron/Bossiella spp.-complex <0.1 - <0.1 <0.1 <0.01 <0.01 Mastocarpus papilla/us <0.1 - <0.1 <0.1 <0.01 <0.01 Cryptopleura violacea <0.1 <0.1 - - <0.01 <0.01 Acrosiphonia spp. <0. 1 - <0.1 - <0.01 <0.01 Callophyllis spp. - - <0.1 - <0.01 <0.01 Chondracanthus canaliculatus - - <0.1 - <0.01 <001 Cladophora spp. <0.1 - - - <0.01 <0.01 Gelidium coulteri - - <0.1 - <0.01 <0.01 Mazzaella affinis - - <0.1 - <0.01 <0.01 Invertebrate Counts Lottia scabra 127.4 237.2 141.4 158.6 166.15 49.06 Tetrac/ita rubescens 69.2 61.0 64.2 50.4 61 .20 7.95 Epiactis prolifera 34.0 52.4 78.8 45.0 52.55 19.06 Fissure/la volcano 6.8 11 .2 7.2 10.4 8.90 2.22 Lottia limatula 3.2 11.4 7.6 3.6 6.45 3.85 Lottia pelta 2.0 5.0 6.8 10.2 6.00 3.43 Anthopleura elegantissima 2.8 3.4 2.6 2.6 2.85 0.38 Pachygrapsus crassipes 1.4 2.8 3.6 1.0 2.20 1.21 Strongylocentrotus purpuratus 1.6 3.4 1.2 1.0 1.80 1.10 Serpulidae 2.4 0.6 1.4 2.4 1.70 0.87 Lottiidae 2.6 1.0 1.0 1.0 1.40 0.80 Cyanoplax spp. 0.6 0.6 1.0 0.6 0.70 0.20 Mytilus spp. 0.6 0.6 0.8 0.8 0.70 0.12 Lottia gigantea 0.6 1.0 0.4 - 0.50 0.42 Pagurus spp. 1.0 0.8 - - 0.45 0.53 lschnochitonidae - 0.6 0.2 0.4 0.30 0.26 Lottia scutum - - - 1.0 0.25 0.50 Nuttallina californica 0.4 0.6 - - 0.25 0.30 Ocinebrina spp. 0.8 - - 0.2 0.25 0.38 (table continued)

C' ESLO2021-02 C-25

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C11 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diab lo Cove Station NDC 1+0.3m (7+ 1).

Survey 200 201 202 203 Survey Date 24-Jan-20 08-Apr-20 17-Aug-20 17-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Elysia hedgpethi . . 0.6 0.2 0.20 0.28 Mopalia spp. 0.2 0.2 - 0.2 0.15 0.10 Barleeia spp. - 0.6 - - 0.15 0.30 Doris spp. - - - 0.4 0.10 0.20 Anthozoa - 0.2 - - 0.05 0.10 Cal/iostoma spp. - - - 0.2 0.05 0.10 Chlorostoma funebra/is - - 0.2 - 0.05 0.10 Diau/u/a sandiegensis - - - 0.2 0.05 0.10 Grapsidae - 0.2 - - 0.05 0.10 Octopus spp. - 0.2 - - 0.05 0.10 Ophiothrix spiculata - 0.2 - - 0.05 0.10 Pugettia spp. - - - 0.2 0.05 0.10 Roma/eon antennarius - - 0.2 - 0.05 0.10 Invertebrate Cover Chthamalus fissus 12.7 18.3 8.6 13.2 13.19 3.96 Phragmatopoma californica 2.2 4.4 2.4 1.3 2.57 1.29 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Substrate Cover rock 27.6 24.9 13.8 23.7 22.50 6.01 sand (shell gravel) 4.5 6.2 8.8 10.5 7.48 2.65 cobble 3.6 6.2 2.8 3.1 3.94 1.53 c, ESLO2021 -02 C-26

Appendix C - Intertidal Algae , Invertebrates and Substrates Table Cl2 . Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2 ) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC I +0.9m (7+ 3).

Survey 200 201 202 203 Survey Date 24-Jan-20 08-Apr-20 17-Aug-20 17-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 44.9 42.9 43.8 47.3 44.72 1.89 Gelidium pusi/lum 0.1 <0.1 2.2 2.0 1.08 1.16 coralline crust 1.5 0.8 0.4 0.8 0.89 0.48 Ulva spp. . . 1.8 <0.1 0.45 0.91 filamentous red algae complex <0.1 - <0.1 0.7 0.19 0.34 Mastocarpus papilla/us <0.1 <0.1 0.4 0.3 0.18 0.1 7 Corallina vancouveriensis <0.1 0.1 <0.1 0.1 0.09 0.07 juv. articulated coralline algae <0.1 <0.1 <0.1 <0.1 0.07 <0.01 Mazzae/la affinis . - - 0.1 0.04 0.07 Chlorophyta (filamentous) . - <0.1 <0.1 0.02 0.04 Cladophora spp. <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Gelidium coulteri . - <0.1 - <0.01 <0.01 Colpomenia spp. - - <0.1 - <0.01 <0.01 Ca/liarthron!Bossie/la spp.-complex - - - <0.1 <0.01 <0.01 Chondracanthus canaliculatus - - - <0.1 <0.01 <0.01 Invertebrate Counts Lottia scabra 139.2 143.4 145.0 95.2 130.70 23.79 Chlorostoma funebralis 17.6 104.0 15.0 66.8 50.85 42.70 Epiactis prolifera 35.2 14.8 16.0 14.2 20.05 10.13 Anthopleura elegantissima 6.6 5.8 3.2 5.0 5.15 1.45 Lottia limatula 4.2 3.4 5.6 5.6 4.70 1.09 Pagurus spp. 15.2 1.8 0.2 1.4 4.65 7.07 Lottia pelta 1.8 1.8 2.2 4.2 2.50 1.15 Lottia scutum 0.6 0.2 1.8 3.0 1.40 1.26 Pachygrapsus crassipes 0.2 1.6 1.8 1.2 1.20 0.71 Lottiidae 1.2 1.0 1.0 1.0 1.05 0.10 Fissure/la volcano 1.2 0.6 0.6 1.0 0.85 0.30 Cyanoplax spp. 0.2 0.2 0.6 0.8 0.45 0.30 Tetraclita rubescens 1.4 - 0.4 - 0.45 0.66 Littorina scutulata 0.8 0.6 - - 0.35 0.41 Mytilus spp. 0.4 0.6 0.2 0.2 0.35 0.19 Anthopleura xanthogrammica - - 1.0 - 0.25 0.50 Ocinebrina spp. 0.2 0.4 0.2 0.2 0.25 0.10 Acanthinucella spp. 0.2 0.4 - 0.2 0.20 0.16 Grapsidae 0.2 0.2 - - 0.10 0.12 Anthozoa - 0.2 - - 0.05 0.10 Barleeia spp. - - - 0.2 0.05 0.10 Littorina spp. 0.2 - - - 0.05 0.10 Mopalia spp. 0.2 - - 0.05 0.10 Septifer bifurcatus 0.2 - - - 0.05 0.10 Serpulidae - - 0.2 - 0.05 0.10 (table continued)

C' ESLO2021-02 C-27

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C12 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 1+0.9m (7+3).

Survey 200 201 202 203 Survey Date 24-Jan-20 08-Apr-20 17-Aug-20 17-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Chthamalus fissus 4.7 7.1 6.9 9.0 6.89 1.76 Phragmatopoma californica <0.1 <0.1 <0.1 0.1 0.04 0.07 Spirorbidae - <0.1 - <0. 1 <0.01 <0.01 Pis/a spp. - <0.1 - - <0.01 <0.01 Substrate Cover rock 39.8 38.1 38.7 32.2 37.19 3.43 sand (shell gravel) 6.3 8.1 4.4 7.5 6.58 1.62 cobble 4.5 4.9 3.8 2.4 3.92 1.10 C' ESLO2021-02 C-28

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C13. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 2+0.3m (8+ 1).

Survey 200 201 202 203 Su rvey Date 09-Jan-20 06-May-20 03-Aug-20 29-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Phyl/ospadix spp. 36.0 30.8 44.3 32.6 35.90 6.00 non-coralline crust 21 .6 21.7 16.6 21.9 20.45 2.57 Codium fragile subsp. californicum 8.5 16.1 20.6 7.4 13.13 6.30 coralline crust 11 .5 12.8 7.1 12.0 10.84 2.56 fi lamentous red algae complex 8.1 14.1 9.9 7.0 9.76 3.12 Corallina vancouveriensis 8.7 1.5 1.0 4.4 3.91 3.53 juv. articulated coralline algae 4.1 4.4 0.9 2.8 3.06 1.60 Chlorophyta (filamentous) 1.3 0.2 10.1 <0.1 2.92 4.85 Acrosorium ciliolatum 1.0 1.0 0.8 1.4 1.04 0.24 Ulva spp. <0.1 1.3 2.6 <0.1 0.98 1.21 Smilhora naiadum <0.1 <0.1 0.8 0.5 0.33 0.36 Cryp/opleura violacea 1.3 <0.1 <0.1 <0.1 0.33 0.61 Calliarlhron!Bossiella spp.-complex 0.3 0.1 <0.1 0.6 0.26 0.22 Pterosiphonia dendroidea 0.4 0.2 <0.1 0.3 0.25 0.14 Farlowia!Pikea spp.-complex 0.3 - 0.3 0.3 0.23 0.15 Chrysophyta 0.1 0.5 0.1 - 0.19 0.21 Sargassum muticum 0.3 <0.1 <0.1 0.4 0.19 0.22 Prionilis spp. 0.1 <0.1 <0.1 <0.1 0.04 0.07 Gelidium coulteri - <0.1 <0.1 0.1 0.04 0.07 Phycodrys spp. <0.1 - - <0.1 0.02 0.03 Corallina chilensis <0.1 - - - 0.02 0.04 Melobesia mediocris <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Colpomenia spp. <0.1 <0.1 <0.1 - <0.01 <0.01 Halicystis ova/is (=Oerbesia marina) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Bryopsis spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Mastocarpus papilla/us <0.1 <0.1 - <0.1 <0.01 <0.01 Chondracanthus canaliculatus - <0.1 <0.1 <0.1 <0.01 <0.01 Gastroclonium subarliculatum <0.1 <0.1 <0.1 - <0.01 <0.01 Cladophora spp. <0.1 - - - <0.01 <0.01 Chondracanlhus corymbiferus <0.1 - - - <0.01 <0.01 Sarcodiotheca gaudichaudii - <0.1 <0.1 - <0.01 <0.01 Acrosiphonia spp. <0.1 - - - <0.01 <0.01 Cal/ophyllis spp. <0.1 - - - <0.01 <0.01 Rhodymenia spp. - - <0.1 - <0.01 <0.01 Invertebrate Counts Lol/ia scabra 141 .8 91.0 97.8 150.6 120.30 30.25 Mytilus spp. 52.4 49.2 47.2 146.2 73.75 48.35 Tetracli/a rubescens 58.0 6.8 32.2 58.2 38.80 24.58 Strongylocentrotus purpuratus 11 .0 6.2 7.0 7.8 8.00 2.10 Fissure/la volcano 6.0 3.2 3.2 8.4 5.20 2.51 Lol/ia pelta 3.4 3.0 2.0 12.4 5.20 4.84 Epiac/is prolifera 3.0 1.6 4.8 9.4 4.70 3.40 Anthopleura elegantissima 7.4 3.8 1.2 3.8 4.05 2.55 Lottia giganlea 2.6 2.4 1.2 4.0 2.55 1.15 Lottia limalula 0.8 3.8 0.8 2.4 1.95 1.45 (table continued) p, ESLO2021-02 C-29

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C13 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2 ) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 2+0.3m (8+1).

Survey 200 201 202 203 Survey Date 09-Jan-20 06-May-20 03-Aug-20 29-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Lottiidae 1.0 1.0 1.0 0.8 0.95 0.10 Pachygrapsus crassipes 0.2 1.2 1.0 0.8 0.80 0.43 Serpulidae 1.4 - 0.8 1.0 0.80 0.59 Mopaliaspp. 1.4 0.4 - 0.8 0.65 0.60 Cyanoplax spp. 0.8 0.6 0.4 0.2 0.50 0.26 Bar/eeia spp. 0.2 0.4 0.6 0.2 0.35 0.19 Pugettia spp. 0.4 - 0.4 0.4 0.30 0.20 Nut/a/Jina ca/ifornica 0.2 - - 0.8 0.25 0.38 Lacuna spp. 0.6 - - 0.2 0.20 0.28 Ocinebrina spp. 0.4 0.2 - 0.2 0.20 0.16 Sipuncula - 0.4 0.2 0.2 0.20 0.16 Elysia hedgpethi - 0.2 0.4 - 0.15 0.19 Septifer bifurcatus 0.2 0.2 0.2 - 0.15 0.10 Cancridae - - 0.4 - 0.10 0.20 Diodora spp. 0.4 - - - 0.10 0.20 Diopatra ornata - 0.2 0.2 - 0.10 0.12 Grapsidae 0.4 - - - 0.10 0.20 Ophiactis simplex 0.2 0.2 - - 0.10 0.12 Ophiothrix spiculata - - 0.4 - 0.1 0 0.20 Serpulorbis squamigerus 0.2 - 0.2 - 0.10 0.12 Acmaea mitra 0.2 - - - 0.05 0.10 Anthopleura xanthogrammica 0.2 - - - 0.05 0.10 Chlorostoma funebralis - 0.2 - - 0.05 0.10 Crassadoma gigantea - - - 0.2 0.05 0.10 Homolopoma luridum!Lirularia succincta 0.2 - - - 0.05 0.10 lschnochitonidae - - 0.2 - 0.05 0.10 Leucil/a nuttingi - - 0.2 - 0.05 0.10 Littorina spp. - 0.2 - - 0.05 0.10 Nemertea - - 0.2 - 0.05 0.10 Pelecypoda boring - - 0.2 - 0.05 0.10 Roma/eon antennarius - - 0.2 - 0.05 0.10 Stenoplax spp. - 0.2 - - 0.05 0.10 Trimuscu/us reticulatus 0.2 - - - 0.05 0.10 Triopha spp. - - 0.2 - 0.05 0.10 (table continued) t' ESLO2021-02 C-30

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C13 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 2+0.3m (8+ 1).

Survey 200 201 202 203 Survey Date 09-Jan-20 06-May-20 03-Aug-20 29-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Pista spp. 3.3 0.4 <0.1 3.8 1.88 1.98 Ch/hamalus fissus 0.7 0.3 0.1 0.6 0.42 0.25 Phragmatopoma ca/ifornica 0.1 <0.1 <0.1 0.5 0.16 0.23 tunicates, compound/social <0.1 <0.1 0.1 <0.1 0.04 0.07 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Bryozoa (encrusting) <0.1 - <0.1 <0.1 <0.01 <0.01 Porifera (encrusting) <0.1 - <0.1 - <0.01 <0.01 Salmacina lribranchiata - <0.1 - - <0.01 <0.01 Substrate Cover rock 16.4 27.5 15.5 16.6 18.99 5.69 sand (shell gravel) 1.2 5.7 6.0 8.5 5.37 306 cobble 4.3 0.3 0.3 3.3 2.07 206 c~ ESLO2021 -02 C-31

Appendix C - Intertidal Algae , Invertebrates and Substrates Table Cl4. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2 ) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 2+0.9m (8+3).

Survey 200 201 202 203 Survey Date 09-Jan-20 06-May-20 03-Aug-20 29-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 16.2 9.0 13.7 21 .9 15.19 5.41 filamentous red algae complex 0.7 1.5 4.4 5.2 2.95 2.21 coralline crust 3.0 1.7 0.5 2.2 1.83 1.04 U/va spp. - 0.1 5.6 <0.1 1.44 2.79 Corallina vancouveriensis 1.1 2.2 <0.1 0.7 1.01 0.87 juv. articulated coralline algae 1.4 0.5 0.5 0.3 0.66 0.49 Codium fragile subsp. californicum 0.2 <0.1 0.3 <0.1 0.14 0.13 Gelidium pusil/um <0.1 <0.1 - 0.2 0.06 0.1 0 Mastocarpus papilla/us <0.1 - <0.1 <0.1 0.02 0.04 Cladophora spp. <0.1 <0.1 - <0.1 <0.01 <0.01 Chlorophyta (filamentous) <0.1 <0.1 <0.1 - <0.01 <0.01 Mazzaella affinis - - <0.1 - <0.01 <0.01 Gelidium coulteri <0.1 - <0.1 <0.1 <0.01 <0.01 Prionitis spp. - <0.1 <0.1 - <0.01 <0.01 Chondracanthus canaliculatus <0.1 <0.1 - - <0.01 <0.01 Endocladia muricata - <0.1 - - <0.01 <0.01 Bryopsis spp. - <0.1 - - <0.01 <0.01 Calliarthron!Bossiella spp.-complex - - - <0.1 <0.01 <0.01 Chrysophyta <0.1 - - - <0.01 <0.01 Colpomenia spp. - - <0.1 - <0.01 <0.01 Grateloupia californica - - <0.1 - <0.01 <0.01 Mazzael/a leptorhynchos - - - <0.1 <0.01 <0.01 Invertebrate Counts Lottia scabra 467.8 183.4 228.4 214.4 273.50 130.89 Mytilus spp. 44.8 38.4 30.0 39.0 38.05 6.09 Anthopleura elegantissima 35.4 19.4 17.6 15.6 22.00 9.07 Epiactis prolifera 15.6 9.0 15.6 20.0 15.05 4.54 Lottia gigantea 10.8 8.8 9.0 6.6 8.80 1.72 Lottiidae 6.0 4.2 19.2 1.4 7.70 7.90 Chlorostoma funebralis 5.2 0.6 - 12.0 4.45 5.54 Lottia limatula 4.4 2.0 2.6 5.8 3.70 1.73 Lottia pelta 3.0 0.6 1.2 3.8 2.15 1.50 Strongylocentrotus purpuratus 4.0 1.4 0.2 0.6 1.55 1.71 Pachygrapsus crassipes 0.6 3.0 1.6 0.6 1.45 1.14 Cyanoplax spp. 1.0 1.2 1.4 0.4 1.00 0.43 Fissure/la volcano 2.8 0.8 - 0.2 0.95 1.28 Tetraclita rubescens 1.8 0.2 - 0.8 0.70 0.81 Pagurus spp. 0.4 0.6 0.2 1.4 0.65 0.53 Littorina spp. - 1.0 0.6 0.2 0.45 0.44 Littorina scutulata 1.0 - - - 0.25 0.50 Mopa/iaspp. 0.2 0.2 - 0.4 0.20 0.16 Elysia hedgpethi - 0.4 0.2 - 0.15 0.19 Nu/la/Jina californica 0.4 - - 0.2 0.15 0.19 Serpulidae - 0.2 0.2 0.2 0.15 0.10 (table continued)

~ ESLO2021 -02 C-32

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C14 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 2+0.9m (8+3).

Survey 200 201 202 203 Survey Date 09-Jan-20 06-May-20 03-Aug-20 29-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Ba/anus spp. - - - 0.4 0.10 0.20 Lottia scutum - 0.4 - - 0.10 0.20 Lottia ochracea 0.2 - - - 0.05 0.10 Pelecypoda boring - 0.2 - - 0.05 0.10 Invertebrate Cover Chthamalus fissus 13.3 16.0 12.7 27.4 17.34 6.84 Phragmatopoma califomica 0.6 0.4 <0.1 <0.1 0.25 0.26 Spirorbidae <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Sa/macina tribranchiata - <0.1 - - <0.01 <0.01 Substrate Cover rock 61 .3 66.0 63.0 42.9 58.32 10.45 cobble 2.8 1.6 1.8 3.0 2.31 0.71 sand (shell qravel) <0.1 - 0.3 <0.1 0.09 0.17

p. ESLO2021 -02 C-33

Append ix C - Intertidal Algae, Invertebrates and Substrates Table ClS. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 3+0.3m (9+1).

Survey 200 201 202 203 Survey Date 13-Jan-20 04-Apr-20 07-Jul-20 . 17-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Codium fragile subsp. ca/ifornicum 24.5 34.2 65.0 21.0 36.20 20.00 non-coralline crust 19.3 23.6 26.0 23.2 23.04 2.79 Corallina vancouveriensis 14.0 8.3 3.3 14.6 10.05 5.31 filamentous red algae complex 7.7 7.2 7.6 11.6 8.55 2.05 coralline crust 8.4 6.0 7.4 12.0 8.46 2.57 Acrosorium ciliolatum 9.4 5.6 4.4 8.6 7.01 2.36 juv. articulated coralline algae 3.3 8.7 4.1 8.8 6.20 2.93 Farlowia!Pikea spp.-complex 3.1 1.0 0.9 6.2 2.78 2.48 Chlorophyta (filamentous) 0.8 1.3 0.8 1.5 1.10 0.31 U/va spp. <0.1 <0. 1 3.2 0.6 0.96 1.52 Calliarthron!Bossiel/a spp.-complex 1.5 0.1 0.7 0.6 0.75 0.58 Cryptopleura violacea 0.8 0.3 0.4 0.3 0.45 0.21 Bryopsis spp. 0.3 <0.1 0.5 - 0.19 0.24 Chrysophyta 0.3 0.4 - - 0.17 0.21 Ge/idium cou/teri 0.4 <0.1 <0.1 <0.1 0.11 0.21 Pferosiphonia dendroidea <0. 1 <0.1 <0.1 0.2 0.09 0.09 Prionitis spp. <0.1 <0. 1 <0.1 <0.1 0.05 0.03 Cal/ophyllis spp. - 0.1 <0.1 - 0.04 0.07 Cystoseira osmundacea <0.1 0.1 <0.1 - 0.04 0.07 Ge/idium pusillum <0.1 - <0.1 - 0.04 0.04 Sargassum muticum <0.1 <0. 1 - 0.02 0.03 Corallina chilensis - <0.1 <0.1 - 0.02 0.03 Co/pomenia spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Halicystis ova/is (=Oerbesia marina) <0. 1 <0. 1 <0.1 <0.1 <0.01 <001 Cladophora spp. - <0.1 - - <0.01 <0.01 Rhodymenia spp. <0.1 <0.1 - - <0.01 <0.01 Callithamnion spp.lP/eonosporium spp. <0.1 <0.1 - - <0.01 <0.01 Chondracanthus corymbiferus <0. 1 - - - <0.01 <0.01 Acrosiphonia spp. - <0.1 - - <0.01 <001 Chondracanthus canaliculatus <0.1 - <0.1 - <0.01 <001 Halymenia!Schizymenia spp.-complex <0.1 <0.1 - - <0.01 <001 Oictyota binghamiae <0.1 - - - <0.01 <001 Grateloupia californica <0.1 - - - <0.01 <0.01 Laminariales - <0.1 - - <0.01 <0.01 Mastocarpus papilla/us <0. 1 - - - <0.01 <0.01 Mazzael/a vo/ans - - <0.1 - <0.01 <0.01 Invertebrate Counts Tetraclita rubescens 154.4 118.0 76.8 156.8 126.50 37.59 Lottia scabra 193.2 59.0 67.6 69.0 97.20 64.15 Mytilus spp. 67.0 40.8 36.0 17.4 40.30 20.46 Fissure/la volcano 10.8 21 .6 11 .0 13.2 14.15 5.08 Epiactis prolifera 3.6 5.8 3.6 10.4 5.85 3.21 Lottia pelta 5.6 6.4 5.2 3.8 5.25 1.09 Ba/anus spp. 14.6 1.8 2.4 - 4.70 6.68 Lottia aiaantea 5.4 3.0 1.6 3.6 3.40 1.57 (table continued) c~ ESLO2021-02 C-34

Append ix C - Intertidal Algae , Invertebrates and Substrates Table ClS (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 3+0.3m (9+ 1).

Survey 200 201 202 203 Survey Date 13-Jan-20 04-Apr-20 07-Jul-20 17-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Strongy/ocentrotus purpuratus 3.0 1.4 1.8 3.2 2.35 0.89 Lottia limatula 2.2 4.0 0.6 2.4 2.30 1.39 Serpulidae 2.4 1.8 2.2 1.2 1.90 0.53 Pachygrapsus crassipes 1.6 1.2 0.4 2.6 1.45 0.91 Lottiidae 1.0 1.0 1.0 1.0 1.00 <0.01 Mopa/ia spp. 0.4 0.2 1.0 0.8 0.60 0.37 Cyanoplax spp. 0.8 0.2 0.2 0.4 0.40 0.28 Barleeia spp. 0.4 0.2 . 0.4 0.25 0.19 Pugettia spp. 0.2 0.2 0.6 . 0.25 0.25 Anthop/eura elegantissima 0.2 . . 0.6 0.20 0.28 Nuttallina ca/ifornica 0.2 0.4 0.2 . 0.20 0.16 Ophiactis simplex . . . 0.8 0.20 0.40 Lottia ochracea 0.2 . . 0.4 0.15 0.19 Pagurus spp. 0.4 0.2 . . 0.15 0.19 Grapsidae 0.6 . . . 0.15 0.30 lschnochitonidae 0.2 0.2 . . 0.10 0.12 Acmaea mitra 0.2 . . . 0.05 0.10 Alpheus spp. . . . 0.2 0.05 0.10 Elysia hedgpethi . . . 0.2 0.05 0.10 Epitonium/Opalia spp. 0.2 . . . 0.05 0.10 Nereididae . . 0.2 . 0.05 0.10 Ophiothrix spiculata . . . 0.2 0.05 0.10 Pseudochama spp. . . . 0.2 0.05 0.10 Roma/eon antennarius . . 0.2 . 0.05 0.10 Serpulorbis squamigerus 0.2 . . . 0.05 0.10 Sipuncula . . . 0.2 0.05 0.10 Invertebrate Cover Chthamalus fissus 1.3 1.0 1.4 0.7 1.08 0.31 Phragmatopoma californica 0.5 <0. 1 <0. 1 1.0 0.39 0.50 Spirorbidae <0.1 <0. 1 <0.1 <0.1 0.01 <0.01 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Bryozoa (encrusting) <0.1 <0.1 <0. 1 <0.1 <0.01 <0.01 Hydroidolina . . . <0.1 <0.01 <0.01 Pis/a spp. . . . <0.1 <0.01 <0.01 Salmacina tribranchiata . . . <0.1 <0.01 <0.01 Substrate Cover rock 17.5 16.5 15.1 13.1 15.56 1.93 cobble 4.9 3.3 1.5 3.1 3.18 1.36 sand (shell Qravel) 1.0 0.4 <0. 1 0.2 0.42 0.45 c,ESL02021 -02 . C-35

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C16. Intertidal algae, sessile invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 3+0.9m (9+3).

Survey 200 201 202 203 Survey Date 13-Jan-20 04-Apr-20 07-Jul-20 17-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 22.2 27.5 25.4 24.1 24.79 2.25 Codium fragile subsp. ca/ifomicum 8.4 12.8 14.0 9.3 11.15 2.71 coralline crust 4.2 1.6 2.4 3.7 2.99 1.19 filamentous red algae complex 2.4 1.6 1.9 2.0 1.98 0.31 Acrosorium ciliolatum 1.4 1.4 0.8 2.2 1.42 0.57 Chlorophyta (filamentous) 0.2 2.2 1.7 0.7 1.20 0.90 U/va spp. <0.1 0.3 2.3 1.5 1.01 1.07 juv. articulated coralline algae 0.9 0.6 1.1 1.4 1.01 0.32 Corallina vancouveriensis 1.2 0.7 0.2 0.1 0.56 0.48 Chrysophyta 1.0 0.3 . . 0.33 0.49 Cryptop/eura vio/acea 0.3 0.2 0.6 . 0.28 0.26 Bryopsis spp. 0.1 0.1 0.6 <0.1 0.21 0.24 Gelidium pusillum <0.1 . 0.3 0.2 0.13 0.14 Pterosiphonia dendroidea . <0.1 <0.1 0.4 0.12 0.20 Farlowia/Pikea spp.-complex 0.4 <0.1 <0.1 . 0.12 0.20 Ge/idium coulteri . <0.1 <0.1 <0.1 0.02 0.03 Chondracanlhus canaliculatus . <0.1 <0.1 . 0.02 0.03 Mastocarpus papilla/us <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Prionitis spp. <0.1 . <0.1 <0.1 <0.01 <0.01 Halicystis ova/is (=Derbesia marina) <0.1 <0.1 . . <0.01 <0.01 Chondracanlhus corymbiferus <0.1 . . . <0.01 <0.01 Cladophora spp. . . <0.1 <0.1 <0.01 <0.01 Mazzae/la affinis . . <0.1 <0.1 <0.01 <0.01 Sarcodiolheca gaudichaudii . <0.1 <0.1 . <0.01 <0.01 Calliarthron/Bossiel/a spp.-complex <0.1 . . . <0.01 <0.01 Co/pomenia spp. . <0.1 . . <0.01 <0.01 Endocladia murica/a . . . <0.1 <0.01 <0.01 Rhodophyta (juv. blades) <0.1 . . . <0.01 <0.01 Invertebrate Counts Lottia scabra 460.0 242.0 202.8 199.4 276.05 124.15 Myti/us spp. 110.4 55.4 78.8 80.4 81.25 22.54 Tetracli/a rubescens 23.8 35.0 29.0 19.8 26.90 6.58 Epiactis prolifera 23.2 14.0 14.4 14.2 16.45 4.50 Lottia giganfea 15.6 17.0 13.2 10.8 14.15 2.73 Loltiidae 6.8 5.4 6.0 6.6 6.20 0.63 Fissure/la volcano 2.2 7.0 4.4 10.6 6.05 3.61 Ba/anus spp. 11 .6 . . 10.4 5.50 6.37 Lotlia limatu/a 3.4 2.6 4.6 0.8 2.85 1.59 Lotlia pelta 3.2 2.4 3.6 0.2 2.35 1.52 Pachygrapsus crassipes 2.4 0.8 3.2 0.8 1.80 1.20 Strongylocentrofus purpuratus 1.4 1.2 1.4 1.4 1.35 0.10 Anthop/eura e/eganfissima 1.2 0.2 1.2 2.4 1.25 0.90 Cyanoplax spp. 2.4 0.8 0.8 0.6 1.15 0.84 Serpulidae 1.4 1.4 0.2 1.4 1.10 0.60 Litlorina soo. 0.2 . 1.0 0.8 0.50 0.48 (table continued) c, ESLO2021 -02 C-36

Appendix C - Interti dal Alg ae, Invertebrates and Substrates Ta ble C16 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for North Diablo Cove Station NDC 3+0.9m (9+3).

Survey 200 201 202 203 Survey Date 13-Jan-20 04-Apr-20 07-Jul-20 17-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Sipuncula 0.8 . 0.2 0.2 0.30 0.35 Barleeia spp. 0.4 - - 0.4 0.20 0.23 Chlorostoma funebralis 0.6 - - 0.2 0.20 0.28 Grapsidae - 0.4 0.4 - 0.20 0.23 lschnochitonidae 0.4 0.2 0.2 - 0.20 0.16 Littorina scutu/ata 0.4 0.4 - - 0.20 0.23 Pagurus spp. 0.8 - - - .0.20 0.40 Anlhopleura xanthogrammica 0.2 0.2 - - 0.10 0.12 Ocinebrina spp. - - 0.4 - 0.10 0.20 Acanthinucel/a spp. 0.2 - - - 0.05 0.10 Amphissa spp. 0.2 - - - 0.05 0.10 Cirratu lidaefTerebellidae - - - 0.2 0.05 0.10 Lottia insessa 0.2 - - - 0.05 0.10 Lottia scutum - 0.2 - - 0.05 0.10 Nuttallina californica 0.2 - - - 0.05 0.10 Pollicipes polymerus 0.2 - - - 0.05 0.10 Septifer bifurcatus - - 0.2 - 0.05 0.10 Invertebrate Cover Chthamalus fissus 12.6 12.6 16.9 19.5 15.43 3.39 Phragmatopoma californica 1.1 <0.1 <0.1 2.0 0.80 0.95 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 tunicates, compound/social <0.1 <0.1 <0.1 - <0.01 <0.01 Substrate Cover rock 43.3 42.8 40.3 36.7 40.78 2.98 cobble 2.8 2.6 1.7 3.6 2.71 0.77 sand {shell qravel) 0.4 <0.1 <0.1 <0.1 0.11 0.17 t' ESLO2021-02 C-37

Appendix C - Intertidal Algae, Invertebrates and Substrates Ta ble Cl 7. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 1+0.3m (10+1).

Survey 200 201 202 203 Survey Date 10-Jan-20 10-Apr-20 06-Jul-20 15-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover Corallina vancouveriensis 15.2 23.1 25.8 13.4 19.39 6.02 filamentous red algae complex 19.4 26.2 16.2 10.0 17.97 6.73 non-coralline crust 10.2 11 .9 17.6 12.8 13.14 3.19 coralline crust 6.3 9.4 5.6 18.0 9.83 5.68 Sargassum muticum 4.9 14.9 7.2 3.3 7.57 5.15 juv. articulated coralline algae 1.6 13.1 2.6 4.9 5.54 5.19 Chrysophyta - 7.9 3.1 0.1 2.80 3.71 Acrosorium cilio/atum 1.7 <0.1 1.0 1.1 0.98 0.69 Co/pomenia spp. <0.1 2.4 0.1 <0. 1 0.64 1.19 Chlorophyta (filamentous) 0.3 0.3 <0.1 <0. 1 0.16 0.14 Ulvaspp. <0.1 0.4 <0.1 <0. 1 0.11 0.21 Pterosiphonia dendroidea 0.3 <0.1 <0.1 <0. 1 0.09 0.13 Endoc/adia muricata . - - 0.3 0.07 0.14 Cal/iarthron!Bossiel/a spp.-complex - - - 0.2 0.05 0.11 Farlowia/Pikea spp.-complex <0.1 <0.1 <0.1 - 0.04 0.04 Prionitis spp. <0. 1 <0.1 <0.1 - 0.02 0.04 Codium fragile subsp. californicum - <0.1 <0.1 - 0.02 0.03 Ge/idium robustum <0. 1 <0.1 <0.1 - <0.01 <0.01 Cryptopleura vio/acea - <0.1 - <0.1 <0.01 <0.01 Halymenia!Schizymenia spp.-complex <0.1 <0.1 - - <0.01 <0.01 Callithamnion spp.lP/eonosporium spp. - <0.1 - - <0.01 <0.01 Cal/ophyl/is spp. - <0.1 - - <0.01 <0.01 Chondracanthus corymbiferus - <0.1 - - <0.01 <0.01 Coral/ina chilensis <0. 1 - - - <0.01 <0.01 Gelidium cou/teri - - - <0. 1 <0.01 <0.01 Ge/idium pusil/um - - - <0.1 <0.01 <0.01 Mazzael/a affinis - - - <0.1 <0.01 <0.01 Osmundea spp. - - - <0. 1 <0.01 <0.01 Rhodophyta Uuv. blades) <0. 1 - - - <0.01 <001 Invertebrate Counts Tetraclita rubescens 32.2 42.8 33.8 77.8 46.65 21 .28 Lotlia scabra 48.6 34.8 43.0 37.2 40.90 6.18 Anthop/eura e/egantissima 30.6 19.4 32.4 24.6 26.75 5.93 Ba/anus spp. 68.2 16.6 - - 21.20 32.30 Fissure/la volcano 9.0 7.6 13.0 17.4 11.75 4.41 Lotlia pet/a 6.8 11 .6 7.8 9.2 8.85 2.08 Lottia lima/ula 4.2 6.6 3.6 4.8 4.80 1.30 Epiactis pro/ifera 4.2 2.6 4.8 1.4 3.25 1.54 Lottiidae 1.0 0.6 0.8 1.8 1.05 0.53 Strongylocentrotus purpuratus - 0.4 1.4 1.8 0.90 0.84 Barleeia spp. 0.8 0.8 1.0 0.4 0.75 0.25 Mylilus spp. 0.6 0.2 0.8 1.4 0.75 0.50 Ch/orostoma funebralis 1.0 - - 1.6 0.65 0.79 Pagurus spp. 1.6 - - - 0.40 0.80 Seroulidae 0.2 0.2 0.4 0.4 0.30 0.12 (table continued) t' ESLO2021-02 C-38

Appendix C - Intertidal Algae , Invertebrates and Substrates Table Cl 7 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC l+0.3m (10+1).

Survey 200 201 202 203 Survey Date 10-Jan-20 10-Apr-20 06-Jul-20 15-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Mopalia spp. 0.2 . 0.4 0.6 0.30 0.26 Pachygrapsus crassipes . - 1.2 - 0.30 0.60 Epitonium!Opalia spp. 0.2 0.2 0.4 0.2 0.25 0.10 Anthopleura artemisia - 0.4 0.4 - 0.20 0.23 Cyanoplax spp. - 0.6 0.2 - 0.20 0.28 Pelecypoda boring - - - 0.8 0.20 0.40 Pseudochama spp. 0.4 0.2 - 0.2 0.20 0.16 Pferopurpura festiva 0.2 0.2 0.2 0.2 0.20 <0.01 Anthopleura xanthogrammica 0.4 - - - 0.10 0.20 Cirratulidaerrerebellidae - - 0.4 - 0.10 0.20 Lottia gigantea 0.2 - 0.2 - 0.10 0.12 Mitra idae 0.2 - 0.2 - 0.10 0.12 Sipuncula - - 0.2 0.2 0.10 0.12 Chlorostoma brunnea 0.2 - - - 0.05 0.10 Diopatra omata - - - 0.2 0.05 0.10 Homolopoma luridum!Lirularia succincta - 0.2 - - 0.05 0.10 lschnochitonidae - - 0.2 - 0.05 0.10 Lottia ochracea - 0.2 - - 0.05 0.10 Nemertea - - - 0.2 0.05 0.10 Nereididae - - 0.2 - 0.05 0.10 Ophiactis simplex - - 0.2 - 0.05 0.10 Invertebrate Cover Phragmatopoma califomica 4.8 0.8 <0.1 7.6 3.32 3.56 Chthamalus fissus 0.1 0.6 0.8 4.3 1.48 1.91 Spirorbidae <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Substrate Cover rock 25.0 14.5 20.2 20.6 20.07 4.30 cobble 7.2 4.1 0.5 7.6 4.84 3.30 sand (shell oravell 3.8 3.6 6.3 3.5 4.29 1.32

~ ESLO2021-02 C-39

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C18. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 1+0.6m (10+2).

Survey 200 201 202 203 Survey Date 10-Jan-20 10-Apr-20 06-Jul-20 15-Dec-20 Annual Annual I

Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 31 .9 27.4 28.4 24.9 28.18 2.91 filamentous red algae complex 8.4 19.6 11 .7 4.8 11 .13 6.31 Corallina vancouveriensis 14.1 4.0 17.2 0.3 8.91 8.04 juv. articulated coralline algae 2.2 19.2 1.9 11 .9 8.80 8.36 coralline crust 5.8 4.2 3.3 9.3 5.66 2.64 Sargassum muticum 2.4 11.3 5.2 2.8 5.40 4.10 Chrysophyta - 1.2 5.5 - 1.68 2.60 U/va spp. <0.1 0.8 0.4 <0.1 0.28 0.36 Acrosorium ci/iolatum 0.3 <0.1 0.7 <0.1 0.26 0.31 Colpomenia spp. - 0.7 <0.1 <0.1 0.19 0.34 Pterosiphonia dendroidea 0.3 - <0.1 0.2 0.16 0.15 Cal/iarthron/Bossiel/a spp.-complex - 0.5 - - 0.12 0.24 Prionitis spp. <0.1 <0.1 0.3 <0.1 0.07 0.14 Chlorophyta (filamentous) <0.1 <0.1 <0.1 <0.1 0.04 0.04 Corallina chilensis <0.1 0.1 - <0.1 0.04 0.07 Farlowia/Pikea spp.-complex <0.1 - <0.1 - 0.02 0.04 Mastocarpus papillatus - <0.1 - <0.1 <0.01 <0.01 Gelidium cou/teri <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Gelidium pusillum <0.1 - <0.1 <0.1 <0.01 <0.01 Callithamnion spp.lP/eonosporium spp. - <0.1 - <0.1 <0.01 <0.01 C/adophora spp. - - - <0.1 <0.01 <0.01 Cryptopleura vio/acea - <0.1 - <0.1 <0.01 <0.01 Rhodophyta (juv. blades) <0.1 - - - <0.01 <0.01 Chondracanthus cana/iculatus - - <0.1 - <0.01 <0.01 Chondracanthus corymbiferus <0.1 - - - <0.01 <0.01 Gelidium robustum <0.1 - - - <0.01 <0.01 Grate/oupia californica <0.1 - - - <0.01 <0.01 Rhodymenia spp. - <0.1 - - <0.01 <0.01 Invertebrate Counts Tetrac/ita rubescens 113.8 72.4 97.6 74.4 89.55 19.80 Lottie scabra 90.6 54.6 143.6 52.4 85.30 42.63 Anthopleura e/egantissima 59.0 37.4 68.6 36.6 50.40 15.96 Ba/anus spp. 67.0 39.8 - 16.6 30.85 29.11 Fissure/la volcano 11.4 7.4 12.0 23.6 13.60 6.97 Lottie pelta 7.6 9.8 8.8 21.6 11.95 6.50 Chlorostoma funebralis 8.6 0.2 - 31.8 10.15 14.98 Lottie limatu/a 6.2 8.8 4.0 9.4 7.1 0 2.49 Pagurus spp. 2.4 0.2 - 3.6 1.55 1.75 Mytilus spp. 1.4 0.8 1.0 1.4 1.15 0.30 Pachygrapsus crassipes 0.4 0.2 2.8 0.4 0.95 1.24 Lottiidae 1.0 1.0 1.0 0.6 0.90 0.20 Serpu/orbis squamigerus 1.4 - 0.2 1.4 0.75 0.75 Barleeia spp. 0.8 0.6 0.4 0.6 0.60 0.16 Strongylocentrotus purpuratus 0.2 0.2 1.2 0.6 0.55 0.47 Serpulidae 0.6 - 0.2 0.8 0.40 0.37 (table continued) c, ESLO2021-02 C-40

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C18 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 1+0.6m (10+2).

Survey 200 201 202 203 Survey Date 10-Jan-20 10-Apr-20 06-Jul-20 15-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Epiactis prolifera 0.6 - 0.8 - 0.35 0.41 Cyanoplax spp. 0.4 0.2 0.6 - 0.30 0.26 Mopa/iaspp. 0.2 0.6 - 0.4 0.30 0.26 Nemertea 0.2 0.2 0.2 - 0.15 0.10 Pisaster ochraceus - - 0.2 0.4 0.1 5 0.19 Anthopleura artemisia - - 0.2 0.2 0.10 0.12 Epitonium/Opalia spp. 0.2 0.2 - - 0.10 0.12 Lottia ochracea - 0.4 - - 0.10 0.20 Ophiactis simplex - - 0.4 - 0.10 0.20 Sipuncula 0.2 - 0.2 - 0.10 0.12 Heptacarpus spp. 0.2 - - - 0.05 0.10 lschnochitonidae - - 0.2 - 0.05 0.10 Leptasterias spp. - - - 0.2 0.05 0.10 Littorina scutu/ata 0.2 - - - 0.05 0.10 Lottia gigantea 0.2 - - - 0.05 0.10 Mitra idae - - 0.2 - 0.05 0.10 Nereididae - - 0.2 - 0.05 0.10 Ocinebrina spp. - - - 0.2 0.05 0.10 Pelecypoda boring - - - 0.2 0.05 0.10 Pollicipes polymerus - - 0.2 - 0.05 0.10 Pferopurpura festiva - 0.2 - - 0.05 0.10 Pugettia spp. - - 0.2 - 0.05 0.10 Septifer bifurcatus - 0.2 - - 0.05 0.10 Invertebrate Cover Chthamalus fissus 0.6 1.3 1.2 2.0 1.27 0.60 Phragmatopoma ca/ifomica 0.7 0. 1 <0.1 3.0 0.96 1.39 Pis/a spp. 0.2 0.6 0.2 0.1 0.30 0.22 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.02 0.04 Porifera (encrusting) <0.1 - <0.1 - <0.01 <0.01 tunicates, compound/social - - <0.1 - <0.01 <0.01 Substrates Cover rock 23.3 18.9 20.9 28.8 22.97 4.26 cobble 7.8 5.8 3.0 4.5 5.30 2.06 sand (shell oravell 0.6 3.8 7.6 6.3 4.57 3.12

~ ESLO2021-02 C-41

Appendix C - Intertidal Algae, Invertebrates and Substrates Table Cl9. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 2+0.3m (11+ 1).

Survey 200 201 202 203 Survey Date 10-Feb-20 05-Jun-20 16-Sep-20 19-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 47.8 35.4 30.8 39.7 38.42 7.26 coralline crust 8.3 11 .7 10.9 14.6 11.37 2.57 Corallina vancouveriensis 7.6 9.6 14.2 10.5 10.47 2.74 juv. articulated coralline algae 3.1 3.3 0.9 4.0 2.83 1.35 Sargassum muticum 1.5 1.6 0.3 1.1 1.11 0.59 Colpomenia spp. <0.1 4.0 - <0.1 1.01 1.97 filamentous red algae complex <0.1 0.8 - 0.5 0.31 0.38 Gelidium coulteri <0.1 <0.1 0.2 0.1 0.11 0.09 Endocladia muricata - - 0.3 - 0.07 0.14 Chlorophyta (filamentous) <0.1 <0.1 - 0.2 0.05 0.10 Gelidium pusillum <0.1 <0.1 - 0.1 0.04 0.07 Cladophora spp. - <0.1 <0.1 <0.1 <0.01 <0.01 Mastocarpus papilla/us - <0.1 <0.1 <0.1 <0.01 <0.01 Ulva spp. <0.1 <0.1 <0.1 - <0.01 <0.01 Prionitis spp. <0. 1 <0.1 - <0.1 <0.01 <0.01 Cystoseira osmundacea <0.1 - <0.1 <0.1 <0.01 <0.01 Cal/iarthron!Bossiella spp.-complex - - - <0.1 <0.01 <0.01 Acrosorium ciliolatum <0.1 - - - <0.01 <0.01 Chondracanthus canaliculatus <0.1 - - - <0.01 <0.01 Chrysophyta <0.1 - - - <0.01 <0.01 Gelidium spp. - - <0.1 - <0.01 <0.01 Invertebrate Counts Chlorostoma funebralis 41.4 56.6 91.2 76.8 66.50 21.94 Lottia scabra 57.2 64.6 30.6 58.6 52.75 15.11 Anthopleura elegantissima 31.4 47.0 50.8 42.8 43.00 8.40 Strongylocentrotus purpuratus 13.0 20.6 4.4 4.6 10.65 7.75 Tetraclita rubescens 9.0 8.6 4.0 5.8 6.85 2.37 Lottia pelta 4.6 5.8 6.4 5.8 5.65 0.75 Lottia limatula 3.8 3.4 4.4 3.6 3.80 0.43 Serpulorbis squamigerus 3.8 3.4 3.4 4.2 3.70 0.38 Fissure/la volcano 4.0 3.8 1.2 1.8 2.70 1.41 Pachygrapsus crassipes 0.2 4. 2 0.6 1.6 1.65 1.80 Lottiidae 0.8 1.6 1.4 1.2 1.25 0.34 Mopalia spp. 0.4 1.0 1.8 1.0 1.05 0.57 Mytilus spp. 0.6 0.6 0.8 1.2 0.80 0.28 Anthopleura artemisia 0.8 0.6 0.2 1.4 0.75 0.50 Barleeia spp. 0.2 0.4 1.0 1.0 0.65 0.41 Pelecypoda boring 0.2 1.0 0.8 0.6 0.65 0.34 Pagurus spp. - - 0.8 1.2 0.50 0.60 Cyanoplax spp. - 0.4 0.8 0.6 0.45 0.34 Acanthinucella spp. 0.4 0.2 0.8 0.2 0.40 0.28 Epitonium/Opalia spp. 0.2 0.8 0.6 - 0.40 0.37 Ocinebrina spp. 0.4 0.6 0.4 0.2 0.40 0.16 Sipuncula 0.2 0.2 0.8 0.4 0.40 0.28 Cirratulidae/T erebellidae - - 0.8 0.2 0.25 0.38 (table continued)

~ ESLO2021 -02 C-42

Append ix C - Intertidal Algae , Invertebrates and Substrates Table C19 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diab lo Cove Station SDC 2+0.3m (I I+ 1).

Survey 200 201 202 203 Survey Date 10-Feb-20 05-Jun-20 16-Sep-20 19-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Pollicipes po/ymerus - 0.4 0.2 0.4 0.25 0.19 lschnochitonidae - - 0.4 0.4 0.20 0.23 Lottia scutum - 0.4 0.2 0.2 0.20 0.16 Nemertea - - 0.6 - 0.15 0.30 Aeolidia papil/osa - - 0.4 - 0.10 0.20 Diopatra ornata - - 0.2 0.2 0.10 0.12 Lottia ochracea - 0.4 - - 0.10 0.20 Placiphorella velata - 0.2 - 0.2 0.10 0.12 Serpulidae 0.2 - 0.2 - 0.10 0.12 Sipunculidae - 0.4 - - 0.10 0.20 Ba/anus spp. - - - 0.2 0.05 0.10 Cancridae - - 0.2 - 0.05 0.10 Chaetopteridae - - 0.2 - 0.05 0.10 Ch/orostoma brunnea 0.2 - - - 0.05 0.10 Diodora spp. - 0.2 - - 0.05 0.10 Littorina scutulata - - - 0.2 0.05 0.10 Littorina spp. 0.2 - - - 0.05 0.10 Octopus spp. - 0.2 - - 0.05 0.10 Pugettia spp. - - 0.2 - 0.05 0.10 Pycnogonida - - - 0.2 0.05 0.10 Haliotis spp. - - - 0.1 0.02 0.05 Invertebrate Cover Chthamalus fissus 0.6 2.8 3.5 7.4 3.56 2.83 Phragmatopoma ca/ifornica 1.7 1.0 1.0 2.4 1.55 0.68 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Dodecaceria fewkesi <0.1 <0.1 - <0.1 <0.01 <0.01 Porifera (encrusting) <0.1 - <0.1 - <0.01 <0.01 Substrate Cover rock 24.6 28.3 29.6 17.5 25.00 5.43 cobble 2.4 0.5 4.7 1.0 2.15 1.89 sand (shell Qravel) 2.6 1.4 1.7 1.7 1.82 0.51 t' ESLO2021-02 C-43

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C20. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 2+0.9m (11 +3).

Survey 200 201 202 203 Survey Date 10-Feb-20 05-Jun-20 16-Sep-20 19-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 31.4 24.4 22.3 21 .6 24.91 4.48 Corallina vancouveriensis 0.7 1.7 2.0 2.6 1.77 0.81 coralline crust 1.1 0.4 0.9 0.8 0.82 0.29 juv. articulated coralline algae 0.5 0.6 0.3 <0.1 0.35 0.22 Mastocarpus papilla/us <0.1 <0.1 0.4 <0.1 0.11 0.21 Gelidium pusillum <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Cladophora spp. <0. 1 <0.1 <0.1 <0.1 <0.01 <001 Gelidium coulteri <0.1 <0.1 <0.1 - <0.01 <0.01 Mazzae/la leptorhynchos <0.1 - <0.1 - <0.01 <001 Prionitis spp. <0.1 <0.1 - - <0.01 <0.01 Chlorophyta (filamentous) <0. 1 - - - <0.01 <0.01 Invertebrate Counts Chlorostoma funebralis 163.6 365.4 117.2 296.6 235.70 115.14 Anthopleura elegantissima 79.8 66.4 75.4 121 .0 85.65 24.22 Lottia scabra 69.4 86.0 44.6 57.4 64.35 17.63 Lottia limatula 3.2 1.4 7.0 4.6 4.05 2.36 Lottia pelta 1.0 1.4 4.2 2.2 2.20 1.42 Acanthinucella spp. - 2.8 4.4 1.2 2.10 1.91 Lottiidae 1.0 1.2 1.4 2.0 1.40 0.43 Pachygrapsus crassipes - 0.8 2.6 0.6 1.00 1.12 Mytilus spp. 0.6 0.8 0.4 1.4 0.80 0.43 Pagurus spp. 0.4 0.4 2.0 0.4 0.80 0.80 Cyanoplax spp. - 0.2 0.8 0.6 0.40 0.37 Fissure/la volcano 0.4 1.2 - - 0.40 0.57 Littorina spp. 0.8 - - 0.8 0.40 0.46 Epitonium!Opalia spp. 0.2 0.2 0.6 0.4 0.35 0.19 Anthopleura artemisia - 0.6 - 0.4 0.25 0.30 Cirratulidae!T erebellidae - 0.4 0.6 - 0.25 0.30 Littorina scutulata - 0.6 0.4 - 0.25 0.30 Mopalia spp. 0.2 - 0.6 - 0.20 0.28 Lottia gigantea 0.2 0.2 - 0.2 0.15 0.10 Tetraclita rubescens 0.2 - 0.2 0.2 0.15 0.10 lsopoda - - - 0.6 0.15 0.30 lschnochitonidae - 0.2 0.2 - 0.10 0.12 Ocinebrina spp. 0.2 0.2 - - 0.10 0.12 Pelecypoda boring 0.2 0.2 - - 0.10 0.12 Aeolidia papillosa - - 0.2 - 0.05 0.10 Barleeia spp. - - - 0.2 0.05 0.10 Hermissenda crassicornis - - 0.2 - 0.05 0.10 Lottia scutum - - - 0.2 0.05 0.10 Nemertea - - 0.2 - 0.05 0.10 Sipuncula - - 0.2 - 0.05 0.10 Stronavlocentrotus ourouratus - - - 0.2 0.05 0.10 (table continued) t' ESLO2021-02 C-44

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C20 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 2+0.9m (11+3).

Survey 200 201 202 203 Survey Date 10-Feb-20 05-Jun-20 16-Sep-20 19-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Chthamalus fissus 2.1 8.1 7.2 11 .3 7.19 3.83 Spirorbidae - <0.1 <0.1 - <0.01 <0.01 Phragmatopoma ca/ifomica <0.1 - <0.1 - <0.01 <0.01 Substrate Cover rock 49.2 47.6 52.8 51 .3 50.23 2.27 sand {shell gravel) 12.7 11.4 8.9 4.3 9.33 3.70 cobble 0.6 2.1 1.4 1.0 1.27 0.64

~ ESLO2021 -02 C-45

Appendix C - Intertidal Algae , Invertebrates and Substrates Ta ble C21 . Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 3+0.3m (12+ 1).

Survey 200 201 202 203 Survey Date 18-Feb-20 07-Apr-20 05-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 35.2 24.4 29.0 42.9 32.86 8.04 coralline crust 0.4 0.3 0.4 <0.1 0.25 0.16 Mastocarpus papilla/us <0.1 <0.1 0.3 <0.1 0.09 0.13 juv. articulated coralline algae 0.2 <0.1 <0.1 <0.1 0.09 0.09 Gelidium pusillum <0.1 <0.1 <0.1 <0.1 0.01 <0.01 C/adophora spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Gelidium coulteri - <0.1 <0.1 - <0.01 <0.01 Corallina vancouveriensis <0.1 - - - <0.01 <0.01 Chondracan/hus canalicu/atus - <0.1 - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 156.8 121 .0 163.0 57.8 124.65 48.26 Lotlia scabra 60.6 36.2 28.8 31.4 39.25 14.56 Anlhop/eura e/egantissima 17.8 14.8 12.4 18.6 15.90 2.85 Lottia /ima/ula 8.6 9.4 5.6 10.4 8.50 2.07 Strongylocentrotus purpuratus 0.8 1.4 4.6 6.0 3.20 2.50 Myti/us spp. 3.4 2.8 0.6 1.4 2.05 1.28 Pagurus spp. 4.2 1.4 0.2 - 1.45 1.93 Lottiidae 1.0 0.8 0.8 1.0 0.90 0.12 Serpulorbis squamigerus 1.2 1.6 0.6 0.2 0.90 0.62 Tetrac/ita rubescens 1.4 1.0 0.4 0.6 0.85 0.44 Lotlia pelta 2.0 0.4 0.2 - 0.65 0.91 Ocinebrina spp. 0.6 0.4 1.0 0.4 0.60 0.28 Pachygrapsus crassipes - - 2.0 - 0.50 100 Fissure/la volcano - 0.4 0.2 0.2 0.20 0.16 Acanthinucel/a spp. 0.2 0.2 0.2 - 0.15 0.10 Cirratulidae/Terebellidae - 0.2 0.4 - 0.15 0.19 Mopa/iaspp. 0.2 - 0.2 0.2 0.15 0.10 Serpulidae - 0.4 0.2 - 0.15 0. 19 Ba/anus spp. - 0.4 - - 0.10 0.20 Cyanoplax spp. 0.2 - 0.2 - 0.10 0.12 Epiactis prolifera - 0.2 0.2 - 0.10 0.12 Epitonium!Opalia spp. 0.2 0.2 - - 0.10 0.12 Pelecypoda boring - 0.2 - 0.2 0.10 0.12 Wil/iamia pe/toides 0.2 0.2 - - 0.10 0.12 Anlhop/eura artemisia - - 0.2 - 0.05 0.10 Barleeia spp. 0.2 - - - 0.05 0.10 Ch/orostoma brunnea - 0.2 - - 0.05 0.10 Hermissenda crassicornis - - 0.2 - 0.05 0.10 lschnochitonidae - - - 0.2 0.05 0. 10 Littorina spp. 0.2 - - - 0.05 0.10 Lottia gigantea 0.2 - - - 0.05 0.10 Lottia ochracea - 0.2 - - 0.05 0.10 Lottia scutum - 0.2 - - 0.05 0.10 Patiria miniata - - - 0.2 0.05 0.10 (table continued) c, ESLO2021-02 C-46

Appendix C - Intertidal A lgae, Invertebrates and Substrates Table C21 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 3+0.3m (12+ 1).

Survey 200 201 202 203 Survey Date 18-Feb-20 07-Apr-20 05-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Chfhamalus fissus 4.8 3.5 3.1 1.5 3.25 1.35 tunicates, compound/social - <0.1 - - 0.02 0.03 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Phragmafopoma californica <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Substrate Cover rock 40.0 43.9 41 .6 37.0 40.62 2.89 cobble 17.2 23.1 20.9 15.8 19.25 3.32 sand (shell oravel) 1.7 4.9 6.2 3.0 3.96 2.03 C' ESLO2021-02 C-47

Appendix C - Intertidal A lgae, Invertebrates and Substrates Table C22 . Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Cove Station SDC 3+0.9m (12+3).

Survey 200 201 202 203 Survey Date 18-Feb-20 07-Apr-20 05-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 30.4 23.0 30.1 41 .5 31.25 7.63 Gelidium pusil/um <0.1 <0.1 <0.1 0.4 0.10 0.17 Mastocarpus papi/latus <0.1 <0.1 <0.1 0.1 0.08 0.06 coralline crust <0.1 <0.1 <0.1 <0.1 0.04 0.04 Gelidium coulteri . <0.1 <0.1 - 0.02 0.03 C/adophora spp. - <0.1 <0.1 <0.1 <0.01 <0.01 juv. articulated coralline algae <0. 1 <0.1 - - <0.01 <0.01 Cora/Jina vancouveriensis - <0. 1 - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 106.8 116.4 195.6 62.8 120.40 55.30 Lottia scabra 56.4 49.2 18.4 21.8 36.45 19.16 Anthopleura e/egantissima 32.8 39.2 30.6 36.4 34.75 3.81 Myti/us spp. 12.4 15.6 8.2 10.2 11 .60 3.17 Lottia limatu/a 4.0 3.6 3.0 4.8 3.85 0.75 Ocinebrina spp. 1.8 4.6 2.8 3.4 3.15 1.17 Lottiidae 2.0 1.0 1.0 0.8 1.20 0.54 Pagurus spp. 3.6 0.2 - 1.0 1.20 1.66 Acanthinuce/la spp. 0.6 1.4 1.0 0.8 0.95 0.34 Lottia pelta 1.4 - 0.4 1.2 0.75 0.66 Pachygrapsus crassipes 0.8 0.4 1.0 0.2 0.60 0.37 Littorina spp. 1.0 - 0.6 0.4 0.50 0.42 Tetraclita rubescens 1.2 0.6 0.2 - 0.50 0.53 Cyanoplax spp. 0.4 0.2 1.0 0.2 0.45 0.38 Cirratulidae/T erebellidae - 0.4 0.4 - 0.20 0.23 Littorina scutulata - 0.8 - - 0.20 0.40 Mopalia spp. 0.2 0.2 - - 0.10 0.12 Pelecypoda boring 0.2 0.2 - - 0.10 0.12 Serpulidae 0.2 0.2 - - 0.10 0.12 Anthop/eura artemisia - - 0.2 - 0.05 0.10 Eulithidium spp. - 0.2 - - 0.05 0.10 Lottia scutum 0.2 - - - 0.05 0.10 Polychaeta - - - 0.2 0.05 0.10 Invertebrate Cover Chthamalus fissus 4.6 1.6 2.9 1.4 2.63 1.47 Spirorbidae <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Phragmatopoma californica <0.1 <0.1 <0.1 - <0.01 <0.01 Pista spp. - <0.1 - - <0.01 <0.01 Substrate Cover rock 44.0 43.5 26.5 34.2 37.05 8.39 cobble 16.5 20.2 33.3 18.6 22.15 7.61 sand (shell aravell 3.5 9.9 7.6 3.5 6.09 3.17 p ESLO2021-02 C-48

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C23. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Point Station SDP 1+0.9m (22+3).

Survey 200 201 202 203 Survey Date 07-Feb-20 04-Jun-20 18-Aug-20 20-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 35.7 21.3 26.5 33.0 29.11 6.48 coralline crust 5.9 9.2 5.1 7.4 6.91 1.83 juv. articulated coralline algae 1.7 0.4 0.5 0.9 0.87 0.62 Gelidium coulteri <0.1 <0. 1 0.6 0.9 0.38 0.46 Cladophora spp. - <0. 1 <0. 1 0.7 0.18 0.35 Corallina vancouveriensis 0.6 <0.1 - <0.1 0.16 0.27 U/va spp. - <0.1 0.4 - 0.11 0.21 Cal/iarthron!Bossiel/a spp.-complex <0. 1 <0.1 <0.1 <0.1 0.06 0.03 Colpomenia spp. - - 0.1 - 0.04 0.07 Gelidium pusil/um <0. 1 <0.1 - <0.1 <0.01 <0.01 Mastocarpus papilla/us - <0.1 <0.1 <0.1 <0.01 <0.01 Bryopsis spp. - - <0.1 <0. 1 <0.01 <0.01 Chlorophyta (filamentous) - - <0. 1 - <0.01 <0.01 filamentous red algae complex - - - <0.1 <0.01 <0.01 Cryptopleura vio/acea - - - <0. 1 <0.01 <0.01 Prionitis spp. - - <0.1 - <0.01 <0.01 Invertebrate Counts Mytilus spp. 828.0 815.2 739.6 999.0 845.45 109.55 Lottia scabra 96.2 130.8 52.6 80.8 90.10 32.59 Ba/anus spp. 100.8 33.2 48.6 76.6 64.80 29.98 Tetraclita rubescens 51.4 63.0 37.8 64.8 54.25 12.47 Anthopleura e/egantissima 35.2 34.4 28.4 36.6 33.65 3.62 Lottia pelta 1.2 12.6 7.6 14.6 9.00 5.98 Strongylocentrotus purpuratus 7.8 2.2 5.6 16.4 8.00 6.06 Chlorostoma funebralis 7.4 16.0 1.2 7.0 7.90 6.10 Lottia gigantea 7.6 8.6 3.8 10.2 7.55 2.72 Nuttallina ca/ifornica 7.0 9.4 2.6 5.4 6.10 2.85 Lottia /imatula 2.0 2.6 2.0 6.6 3.30 2.22 Fissure/la volcano 2.4 5.0 2.0 3.0 3.10 1.33 Lottiidae 3.2 1.0 3.4 4.0 2.90 1.31 Pachygrapsus crassipes - 3.4 1.4 1.0 1.45 1.43 Pol/icipes polymerus 1.0 1.0 1.0 2.2 1.30 0.60 Anthopleura xanthogrammica 1.0 1.0 1.0 1.2 1.05 0.10 Ocinebrina spp. 0.2 0.6 0.4 1.6 0.70 0.62 Cyanoplax spp. 0.4 1.2 0.4 0.4 0.60 0.40 Ch/orostoma brunnea 0.4 - - 1.6 0.50 0.76 Sipuncula - 0.8 - 0.8 0.40 0.46 Nemertea - 0.2 - 1.2 0.35 0.57 Pelecypoda boring 0.4 0.4 - 0.6 0.35 0.25 Epiactis prolifera - - - 1.2 0.30 0.60 CirratulidaefT erebellidae - 0.4 - 0.6 0.25 0.30 Lottia ochracea - 0.8 - 0.2 0.25 0.38 Serpulidae 0.2 0.2 - 0.6 0.25 0.25 Nuce/la spp. - 0.2 0.2 0.4 0.20 0.16 (table continued)

~ ESL02021-02 C-49

Appendix C - Intertidal Algae , Invertebrates and Substrates Table C23 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diablo Point Station SDP J+0.9m (22+3).

Survey 200 201 202 203 Survey Date 07-Feb-20 04-Jun-20 18-Aug-20 20-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Mopalia spp. - - 0.2 0.2 0.10 0.12 Ophiactis simplex - - 0.2 0.2 0.10 0.12 Acanthinucella spp. - - - 0.2 0.05 0.10 Acmaea mitra - - - 0.2 0.05 0.10 Aeo/idia papillosa - - - 0.2 0.05 0.10 Anthozoa - 0.2 - - 0.05 0.10 Oiodora spp. - - - 0.2 0.05 0.10 Epitonium!Opa/ia spp. 0.2 - - - 0.05 0.10 Lepidozona spp. - - - 0.2 0.05 0.10 Littorina scutulata - 0.2 - - 0.05 0.10 Littorina spp. - - - 0.2 0.05 0.10 Ophiothrix spiculata - 0.2 - - 0.05 0.10 Pycnogonida - - - 0.2 0.05 0.10 Serpulorbis squamigerus 0.2 - - - 0.05 0.10 Tonicel/a lineata - - - 0.2 0.05 0.10 Invertebrate Cover Chthamalus fissus 0.8 4.4 0.6 2.1 1.98 1.77 Phragmatopoma califomica 0.8 0.9 0.2 2.1 0.99 0.79 Oodecaceria fewkesi 0.2 0.4 0.3 0.6 0.38 0.18 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Bryozoa (encrusting) - - <0.1 <0.1 <0.01 <0.01 Porifera (encrusting) - - - <0.1 <0.01 <0.01 Sa/macina tribranchiata - - - <0.1 <0.01 <0.01 Substrate Cover rock 4.4 11 .8 12.2 5.1 8.39 4.20 cobble - <0.1 - <0.1 0.02 0.03 sand (shell oravel) - - - - . -

t' ESLO2021 -02 C-50

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C24. Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Diablo Point Station SDP 2+0.9m (14+3).

Survey 200 201 202 203 Survey Date 08-Jan-20 11-Apr-20 31-Jul-20 30-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover coralline crust 21 .7 24.2 21 .5 17.4 21 .20 2.84 juv. articulated coralline algae 3.6 6.6 4.2 3.1 4.39 1.54 Corallina vancouveriensis 8.1 2.3 2.7 0.5 3.39 3.26 Calliarthron!Bossiella spp.-complex 3.2 2.7 1.5 2.9 2.59 0.73 non-coralline crust 0.3 2.5 0.6 1.5 1.22 0.99 Cal/ithamnion spp./P/eonosporium spp. - <0.1 1.2 - 0.33 0.61 filamentous red algae complex <0.1 - 0.7 - 0.19 0.34 Prionitis spp. 0.4 <0.1 <0.1 <0.1 0.12 0.20 Ge/idium pusil/um - <0.1 0.4 - 0.11 0.21 Chrysophyta - <0.1 0.2 - 0.05 0.10 Codium fragile subsp. ca/ifomicum <0.1 - <0.1 0.2 0.05 0.10 Gelidium coulteri <0.1 0.1 <0.1 <0.1 0.04 0.07 Bryopsis spp. <0.1 <0.1 <0.1 - 0.02 0.03 Cryptopleura violacea <0.1 <0.1 <0.1 - <0.01 <0.01 Mastocarpus papilla/us - - <0.1 - <0.01 <0.01 Egregia menziesii <0.1 - - <0.1 <0.01 <0.01 Co/pomenia spp. <0.1 - <0.1 - <0.01 <0.01 U/va spp. - - <0.1 - <0.01 <0.01 Chlorophyta (filamentous) - - <0.1 - <0.01 <0.01 Chondracanthus canaliculatus - <0.1 - - <0.01 <0.01 Gelidium robustum <0.1 - - - <0.01 <0.01 Plerosiphonia dendroidea - - <0.1 - <0.01 <0.01 Rhodymenia spp. - - <0.1 - <0.01 <001 Invertebrate Counts Myti/us spp. 560.8 636.4 654.0 675.8 631 .75 49.97 Ba/anus spp. 312.4 147.6 58.6 10.6 132.30 132.81 Anthopleura elegantissima 206.8 105.4 128.8 54.8 123.95 63.28 Strongy/ocentrotus purpuratus 41 .0 39.4 17.4 32.4 32.55 10.77 Tetraclita rubescens 13.6 12.0 10.2 47.4 20.80 17.79 Pollicipes polymerus 17.0 41.8 16.4 5.2 20.10 15.45 Lottia pelta 16.4 20.2 2.0 0.4 9.75 10.02 Ch/orostoma funebralis 6.6 2.6 12.6 16.6 9.60 6.22 Nuttallina califomica 2.8 4.2 5.2 8.4 5.15 2.38 Fissure/la volcano 4.2 2.8 5.4 6.8 4.80 1.70 Anlhopleura xanthogrammica 7.0 2.8 3.4 4.8 4.50 1.87 Serpulidae 3.6 5.4 5.0 2.4 4.10 1.37 Lotlia scabra 2.8 4.8 5.2 1.4 3.55 1.78 Nuce/la spp. 1.8 3.8 2.4 5.6 3.40 1.69 Chlorostoma brunnea 3.8 3.0 2.4 2.2 2.85 0.72 Lottiidae 1.6 1.6 4.0 1.4 2.15 1.24 Pachygrapsus crassipes 0.6 1.2 5.8 0.4 2.00 2.56 Lottia limalula 1.8 2.2 3.2 0.4 1.90 1.16 Pelecypoda boring 1.6 0.8 0.4 0.6 0.85 0.53 Tonicella lineata 0.6 1.0 1.2 0.4 0.80 0.37 Leptasterias spp_ - 1.2 1.8 - 0.75 0.90 (table continued)

~ ESLO2021-02 C-5 1

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C24 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Diablo Point Station SDP 2+0.9m (14+3).

Survey 200 201 202 203 Survey Date 08-Jan-20 11-Apr-20 31-Jul-20 30-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Acmaea mitra 0.8 1.2 0.6 0.2 0.70 0.42 Mopaliaspp. 0.4 1.6 - 0.4 0.60 0.69 Lottia gigantea 0.6 1.0 0.4 0.2 0.55 0.34 Lottia ochracea 0.6 1.0 0.4 - 0.50 0.42 Sipuncula - 1.2 0.8 - 0.50 0.60 Pisaster ochraceus 0.2 - 1.0 0.4 0.40 0.43 Nemertea 0.2 0.8 0.4 - 0.35 0.34 Amphissa spp. 0.4 - 0.2 0.4 0.25 0.19 Serpulorbis squamigerus 0.2 0.2 0.4 - 0.20 0.16 Grapsidae - 0.2. 0.4 - 0.15 0.19 lschnochitonidae - - 0.2 0.4 0.15 0.19 Cirratulidae/Terebellidae - - 0.6 - 0.15 0.30 Cyanoplax spp. 0.2 0.2 - - 0.10 0.12 Elysia hedgpethi - - 0.4 - 0.10 0.20 Lottia scutum - - 0.2 0.2 0.10 0.12 Octopus spp. 0.2 - 0.2 - 0.10 0.12 Oiaulula sandiegensis - - - 0.2 0.05 0.10 Epiactis prolifera 0.2 - - - 0.05 0.10 Hemigrapsus nudus 0.2 - - - 0.05 0.10 lsopoda - 0.2 - - 0.05 0.10 Nereididae - - 0.2 - 0.05 0.10 Ophiactis simplex - - 0.2 - 0.05 0.10 Ophiothrix spiculata - 0.2 - - 0.05 0.10 Placiphorella vela/a - - 0.2 - 0.05 0.10 Pododesmus cepio - 0.2 - - 0.05 0.10 Pycnogonida - 0.2 - - 0.05 0.10 Invertebrate Cover Phragmatopoma californica 1.1 0.4 <0.1 1.6 0.80 0.68 Oodecaceria fewkesi 0.3 0.6 0.6 0.2 0.44 0.19 Chthamalus fissus <0.1 0.6 0.4 0.2 0.32 0.21 Spheciospongia confoederata 0.3 <0.1 0.2 0.1 0.16 0.12 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.02 0.04 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Salmacina tribranchiata <0.1 <0.1 <0.1 <0. 1 <0.01 <0.01 tunicates, compound/social <0.1 <0.1 - - <0.01 <0.01 Hydroidolina - <0.1 - - <0.01 <0.01 Substrate Cover rock 10.6 8. 1 9.0 9.6 9.29 1.05 cobble - - - - . -

sand (shell aravel) - - - - . -

t'- ESLO2021 -02 C-52

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C25. Intertidal algae, sessi le invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Control Station SC 1+0.3m (19+1).

Survey 200 201 202 203 Survey Date 06-Feb-20 09-Apr-20 20-Aug-20 18-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 26.9 28.1 20.7 31 .8 26.89 4.62 Mazzaella flaccida 11 .3 24.2 30.1 14.1 19.93 8.75 Phyllospadix spp. 12.6 13.8 13.5 10.1 12.48 1.69 coralline crust 7.3 17.5 12.4 10.1 11 .82 4.33 Gastroc/onium subarticu/atum 6.9 8.0 11.0 7.2 8.26 1.86 juv. articulated coralline algae 4.1 7.5 7.1 11.9 7.64 3.20 Gelidium cou/teri 3.6 5.3 7.2 2.6 4.67 2.01 Prionilis spp. I 5.8 4.5 2.9 4.1 4.32 1.17 Cryptop/eura violacea 4.9 2.4 4.0 3.3 3.63 1.07 Mastocarpus papilla/us 1.0 7.4 3.8 1.4 3.39 2.96 Corallina vancouveriensis 6.0 3.1 0.5 1.2 2.71 2.44 Mazzaella splendens <0.1 0.1 69 - 1.75 3.41 Chondracanthus canalicu/atus 1.9 0.5 1.3 1.3 1.24 0.57 Mazzaella oregona <0.1 1.7 1.3 0.2 0.80 0.78 Mas/ocarpus jardinii 0.7 0.6 0.9 0.8 0.73 0.15 Smilhora naiadum - <0.1 2.6 <0.1 0.68 1.31 Mazzael/a affinis 0.3 0.6 0.6 - 0.35 0.27 Endocladia muricata - - 0.1 0.8 0.24 0.40 Mazzael/a /eptorhynchos <0.1 0.1 <0.1 0.4 0.13 0.16 Osmundea spp. <0.1 <0.1 0.1 <0.1 0.07 0.06 Ge/idium pusillum 0.1 <0.1 - <0.1 0.04 0.07 Cal/iarthron/Bossiella spp.-complex <0.1 <0.1 <0.1 <0.1 0.02 0.03 Ha/osaccion americanum <0.1 - <0.1 - 0.02 0.04 Sarcodio/heca gaudichaudii <0.1 - <0.1 - 0.02 0.03 Cladophora spp. <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Me/obesia mediocris <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Microcladia coul/eri - - <0.1 - <0.01 <0.01 Cryptopleura ruprech/iana <0.1 - <0.1 <0.1 <0.01 <0.01 Chlorophyta (filamentous) - - <0.1 - <0.01 <0.01 Farlowia/Pikea spp.-complex <0.1 - <0.1 - <0.01 <0.01 Chondracanlhus corymbiferus <0.1 <0.1 <0.1 - <0.01 <0.01 U/va spp. <0.1 - <0.1 <0.1 <0.01 <0.01 Rhodymenia spp. - - <0. 1 <0.1 <0.01 <0.01 Corallina chilensis <0.1 - - - <0.01 <0.01 P/erosiphonia dendroidea <0.1 - - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 66.4 29.0 72.0 161 .2 82.15 56.05 Tetraclita rubescens 41.6 13.4 6.2 0.2 15.35 18.31 Pagurus spp. 3.6 8.0 13.0 10.0 8.65 3.94 Fissure/la volcano 6.8 1.4 6.2 6.4 5.20 2.55 Lollia limatula 6.0 3.6 7.8 2.2 4.90 2.49 Strongylocentrotus purpuratus 2.8 1.8 5.2 4.4 3.55 1.54 Lottia scabra 4.4 - 2.0 1.8 2.05 1.81 Lollia scutum 0.6 3.4 0.4 1.8 1.55 1.38 (table continued) t' ESLO2021-02 C-53

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C25 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Control Station SC I+0.3m (19+1).

Survey 200 201 202 203 Survey Date 06-Feb-20 09-Apr-20 20-Aug-20 18-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Mopalia spp. 2.0 0.4 1.4 1.6 1.35 0.68 Patiria miniata 1.2 1.0 1.8 1.0 1.25 0.38 Lottiidae 1.2 1.0 1.4 1.0 1.15 0.19 Nemertea - - 2.6 2.0 1.15 1.35 Serpulidae 2.4 0.2 1.0 0.8 1.10 0.93 Lottia pelta 1.6 1.0 1.2 0.2 1.00 0.59 Acmaea mitra 0.8 0.8 0.6 0.8 0.75 0.10 Ch/orostoma brunnea - - 2.2 0.8 0.75 1.04 Anthop/eura elegantissima 0.8 0.8 0.4 0.6 0.65 0.19 Crepidula spp. 0.8 0.6 0.6 0.6 0.65 0.10 Pachygrapsus crassipes 0.8 0.4 0.6 - 0.45 0.34 Mytilus spp. 0.4 0.2 0.2 0.8 0.40 0.28 Epiactis prolifera - - 0.8 0.2 0.25 0.38 Clavelina huntsmani - 0.4 0.2 0.2 0.20 0.16 Leptasterias spp. - 0.2 0.2 0.4 0.20 0.16 Nu/ta/Jina ca/ifornica - - 0.2 0.6 0.20 0.28 Grapsidae 0.2 - 0.4 - 0.15 0.19 lschnochitonidae 0.2 0.4 - - 0.15 0.19 Lacuna spp. - 0.2 - 0.4 0.15 0.1 9 Ba/anus spp. - - 0.4 - 0.10 0.20 Cal/iostoma Jigatum - 0.2 - 0.2 0.10 0.12 Lottia ochracea - - 0.2 0.2 0.10 0.12 Pachycheles spp. - - 0.4 - 0.10 0.20 Tonicel/a lineata 0.4 - - - 0.10 0.20 Alia spp. - - - 0.2 0.05 0.10 Anthop/eura artemisia - 0.2 - - 0.05 0.10 Cryptochiton stel/eri - - - 0.2 0.05 0.10 Diodora spp. - - - 0.2 0.05 0.10 Doriopsil/a a/bopunctata 0.2 - - - 0.05 0.10 Fissurellidea bimaculata - 0.2 - - 0.05 0.10 Homolopoma luridum/Lirularia succincta - - 0.2 - 0.05 0.10 Loxorhynchus spp. - - 0.2 - 0.05 0.10 Nereididae - - - 0.2 0.05 0.10 Octopus spp. - 0.2 - - 0.05 0.10 Placiphorella vela/a - - 0.2 - 0.05 0.10 Pseudoceros montereyensis - - 0.2 - 0.05 0.10 Pugettia spp. - 0.2 - - 0.05 0.10 Roma/eon antennarius - 0.2 - - 0.05 0.10 (table continued)

~ ESLO2021-02 C-54

Append ix C - Intertidal Algae, Invertebrates and Substrates Table C25 (continued). Intertidal algae, sess il e invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Control Station SC 1+0.3m (19+ I).

Survey 200 201 202 203 Survey Date 06-Feb-20 09-Apr-20 20-Aug-20 18-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Cover Phragmatopoma californica 12. 5 6.9 6.3 15.3 10.26 4.39 Pistaspp. <0.1 . 2.2 0.6 0.71 1.05 Bryozoa (encrusting) 0.3 <0.1 <0.1 <0.1 0.07 0.14 tunicates, compound/social <0. 1 <0.1 <0.1 0.2 0.07 0.10 Bryozoa (erect) . . 0.1 . 0.03 0.07 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Chthamalus fissus <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 <0.01 <001 Hydroidolina - <0.1 - - <0.01 <0.01 Salmacina tribranchiata - <0.1 - - <0.01 <0.01 Substrate Cover rock 9.4 13.3 6.7 6.4 8.94 3.22 sand {shell gravel) 7.1 1.3 3.1 5.5 4.24 2.55 cobble 4.2 3.4 3.4 1.7 3.18 1.03

p. ESL02021 -02 C-55

Append ix C - Intertidal Algae, Invertebrates and Substrates Ta ble C26. Intertidal algae, sessile invertebrates, and substrates (percent cover) and moti le invertebrates (abundance per 1.0 m 2) survey means, standard deviations and 2020 annual means for South Control Station SC l+0.9m (19+3).

Survey 200 201 202 203 Survey Date 06-Feb-20 09-Apr-20 20-Aug-20 18-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cover non-coralline crust 38.7 31.2 32.2 34.2 34.06 3.31 Silvetia compressa 8.7 8.8 8.3 6.4 8.06 1.1 3 Endocladia muricata 6.2 9.5 7.0 8.5 7.81 1.50 coralline crust 5.1 8.2 3.6 5.4 5.57 1.91 Mastocarpus papilla/us 1.4 2.6 8.6 4.4 4.26 3.15 Mastocarpus jardinii 1.9 0.8 0.4 0.8 0.97 0.67 Mazzael/a flaccida 0.6 0.4 0.4 0.3 0.44 0.14 Mazzaella affinis 1.4 - <0.1 - 0.35 0.69 Gelidium pusillum <0.1 0.2 <0.1 <0.1 0.08 0.10 Mazzael/a splendens - - 0.3 - 0.07 0.14 juv. articulated coralline algae <0. 1 <0.1 <0.1 0.1 0.05 0.07 Mazzaella oregona <0.1 - <0.1 <0. 1 0.04 0.04 Cryptop/eura violacea 0.1 - - - 0.03 0.07 Corallina vancouveriensis <0. 1 - - <0. 1 0.02 0.03 Cladophora spp. <0. 1 - <0. 1 <0. 1 0.01 <0.01 Gelidium cou/teri - - <0.1 <0.1 <0.01 <0.01 Chondracanthus canaliculatus - - <0.1 <0.1 <0.01 <0.01 Mazzael/a leptorhynchos - - <0.1 - <0.01 <0.01 Gastroc/onium subarticu/atum - <0.1 - - <0.01 <0.01 Porphyra spp. <0.1 - - - <0.01 <0.01 Invertebrate Counts Ch/orostoma funebralis 67.0 79.6 125.6 64.8 84.25 28.33 Lottia scabra 53.6 50.6 94.2 60.0 64.60 20.12 Lottia limatula 9.6 6.4 15.4 6.0 9.35 4.34 Ocinebrina spp. 5.6 2.2 11 .4 7.8 6.75 3.86 Lottia scutum 3.8 6.4 6.6 4.6 5.35 1.37 Lottia pe/ta 7.8 1.4 4.8 2.2 4.05 2.89 Anthopleura e/egantissima 3.0 2.8 3.4 3.6 3.20 0.37 Pagurus spp. 3.4 1.0 0.4 6.8 2.90 2.91 Myti/us spp. 1.6 2.6 2.0 3.4 2.40 0.78 Lottiidae 2.6 1.0 1.0 1.0 1.40 0.80 Cyanop/ax spp. 0.2 0.2 2.2 1.0 0.90 0.95 Tetraclita rubescens 1.4 0.2 0.8 0.6 0.75 0.50 Pachygrapsus crassipes 1.4 0.2 - 0.2 0.45 0.64 Mopalia spp. 0.4 - 0.4 0.4 0.30 0.20 Ba/anus spp. 1.0 - 0.2 - 0.30 0.48 Acanthinucella spp. - 0.4 0.6 - 0.25 0.30 Crepidula spp. 0.2 ' 0.6 0.2 - 0.25 0.25 Leptasterias spp. 0.2 - 0.4 0.2 0.20 0.16 Littorina scutu/ata 0.2 0.4 - - 0.15 0.19 Serpulidae 0.4 - 0.2 - 0.15 0.19 Acmaea mitra - 0.2 - 0.2 0.10 0.12 Littorina spp. - - 0.2 0.2 0.10 0.12 Anthopleura xanthogrammica 0.2 - - - 0.05 0.10 Cal/iostoma liaatum - - - 0.2 0.05 0.10 (table continued)

C' ESLO202 1-02 C-56

Appendix C - Intertidal Algae, Invertebrates and Substrates Table C26 (continued). Intertidal algae, sessile invertebrates, and substrates (percent cover) and motile invertebrates (abundance per 1.0 m2) survey means, standard deviations and 2020 annual means for South Control Station SC l+0 .9m (19+3).

Survey 200 201 202 203 Survey Date 06-Feb-20 09-Apr-20 20-Aug-20 18-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Fissure/la volcano . 0.2 - - 0.05 0.10 Hemigrapsus nudus - 0.2 - - 0.05 0.10 lschnochitonidae - 0.2 - - 0.05 0.10 Lottia ochracea - - 0.2 - 0.05 0.10 Strongylocentrotus purpuratus - - - 0.2 0.05 0.10 Tonicel/a lineata - - - 0.2 0.05 0.10 Invertebrate Cover Chthamalus fissus 3.0 7.5 7.2 6.8 6.13 2.11 Phragmatopoma californica 0.1 0.4 0.1 <0.1 0.16 0.14 tunicates, compound/social - - 0.1 - 0.03 0.07 Spirorbidae <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Substrate Cover rock 30.8 28.6 31 .7 37.1 32.05 3.60 cobble 11 .0 17.4 8.2 8.9 11.35 4.17 sand (shell qravel) 2.6 1.0 2.2 4.5 2.57 1.47 c~ ESLO2021 -02 C-57

Diab/a Canyon Power Plant Appendix D Intertidal Fishes

Appendix D - Intertidal Fishes Table D1. Intertidal fish survey totals, 2020 annual means, and standard deviations, North Control Station NC lV (N).

Survey 160 161 162 163 Survey Date 23-Jan-20 10-May-20 20-Jul-20 16-Dec-20 Annual Std.

Taxon Total Total Total Total Mean Dev.

Pholidae/Stichaeidae 6 10 1 4 5.25 3.77 Xiphister atropurpureus 6 6 5 3 5.00 1.41 Cebidichthys violaceus 1 3 3 3 2.50 1.00 Gobiesox maeandricus 4 1 1 3 2.25 1.50 O/igocottus snyderi 2 1 - 4 1.75 1.71 Anoplarchus purpurescens 3 1 1 1 1.50 1.00 Gibbonsia spp. - 1 - 4 1.25 1.89 Xiphister mucosus - 1 2 - 0.75 0.96 Cottidae - 2 1 - 0.75 0.96 Apodichthys fucorum - 1 1 - 0.50 0.58 O/igocottus maculosus 1 - - - 0.25 0.50 Clinocottus recalvus - - - 1 0.25 0.50 Typh/oqobius californiensis - - - 1 0.25 0.50 Table D2. Intertidal fish survey totals, 2020 ann ual means, and standard deviations, Field's Cove Station FC l V (C).

Survey 160 161 162 163 Survey Date 21-Jan-20 11-May-20 23-Jul-20 18-Nov-20 Annual Std.

Taxon Total Total Total Total Mean Dev.

Cebidichthys violaceus 3 11 4 11 7.25 4.35 Pholidae/Stichaeidae 3 3 10 9 6.25 3.77 Xiphister atropurpureus - 10 5 2 4.25 4.35 O/igocottus snyderi 3 5 1 8 4.25 2.99 Gobiesox maeandricus 2 11 - 1 3.50 5.07 Cottidae 1 1 - 6 2.00 2.71 Artedius spp. 1 1 - 2 1.00 0.82 Xiphister mucosus - 3 1 - 1.00 1.41 Gibbonsia spp. - - - 3 0.75 1.50 Anoolarchus purpurescens 2 - - 1 0.75 0.96 Table D3. Intertidal fish survey totals, 2020 annual means, and standard deviations, North Diablo Cove Station NOC 1V (L).

Survey 160 161 162 163 Survey Date 20-Feb-20 9-May-20 20-Aug-20 17-Nov-20 Annual Std.

Taxon Total Total Total Total Mean Dev.

Cebidichthys violaceus - 1 - 1 0.50 0.58 O/iqocottus maculosus - - - 1 0.25 0.50 t ESLO2021-02 0 -1

Append ix D - Intertidal Fishes Table D4. Intertidal fish survey totals, 2020 annual means, and standard deviations, South Diablo Cove Station SDC 2V (H).

Survey 160 161 162 163 Survey Date 7-Feb-20 8-May-20 22-Jul-20 14-Dec-20 Annual Std .

Taxon Total Total Total Total Mean Dev.

Cebidichthys violaceus 9 6 2 2 4.75 3.40 Xiphister atropurpureus 1 2 3 1 1.75 0.96 Pholidae/Stichaeidae 2 1 3 . 1.50 1.29 Scytalina cerdale . 1 1 - 0.50 0.58 O/igocottus snyderi 1 - - - 0.25 0.50 Cottidae - - - 1 0.25 0.50 Table D5. Intertidal fish survey totals, 2020 annual means, and standard deviations, South Control Station SC 1V (S).

Survey 160 161 162 163 Survey Date 22-Jan-20 7-May-20 21-Jul-20 16-Nov-20 Annual Std.

Taxon Total Total Total Total Mean Dev.

Pholidae/Stichaeidae 16 16 13 9 13.50 3.32 Gobiesox maeandricus 13 24 6 9 13.00 7.87 Cebidichthys vio/aceus 9 16 12 10 11.75 3.10 Anop/archus purpurescens 8 17 12 7 11 .00 4.55 O/igocottus snyderi 4 5 12 2 5.75 4.35 Gibbonsia spp. 8 5 - 1 3.50 3.70 Xiphister mucosus - 5 2 3 2.50 2.08 Xiphister atropurpureus 3 5 - - 2.00 2.45 Micrometrus aurora - - 5 - 1.25 2.50 Cottidae 1 4 - - 1.25 1.89 O/igocottus maculosus - - 3 - 0.75 1.50 Pholidae - 2 - - 0.50 1.00 ft' ESLO2021-02 D-2

Diab/a Canyon Power Plant Appendix E Subtidal Algae and Invertebrates (SAQ Method)

Appendix E - Subtidal Algae and Invertebrates Table El . Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m2), standard deviations and annual means, Field's Cove Station FC 1 -3m (22-10).

Survey 188 189 190 191 Survey Date 21-Feb-20 09-Jul-20 28-Jul-20 08-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae (no target algae observed in 2020) - - - - -

Invertebrates Strongylocentrotus purpuratus 351 .8 905.8 273.8 380.0 477.81 288.81 Acmaea mitra 113.3 81.8 68.3 78.8 85.50 19.38 Chlorostoma brunnea 60.0 117.8 39.8 12.0 57.38 44.80 Serpulidae 7.8 13.8 9.0 9.3 9.94 2.62 Tonicel/a lineata 6.0 5.3 5.3 2.3 4.69 1.66 Patiria miniafa 3.0 3.0 4.3 8.3 4.62 2.49 Ophiofhrix spiculata 0.5 2.0 3.8 4.5 2.69 1.80 Serpulorbis squamigerus 3.8 2.8 2.0 1.5 2.50 0.98 Oiodora spp. 1.5 2.3 2.0 3.0 2.19 0.62 Anthopleura elegantissima 3.3 2.0 1.0 1.8 2.00 0.94 Pagurus spp. 3.5 1.3 - 1.8 1.62 1.45 Strongy/ocenfrofus franciscanus 1.3 2.0 1.5 1.0 1.44 0.43 Crassadoma gigantea 0.8 1.0 0.8 0.8 0.81 0.12 Haliotis spp. - 1.8 0.8 0.8 0.81 0.72 Cucumaria spp. 0.3 - - 2.5 0.69 1.21 Leptasterias spp. 0.5 0.5 - 1.5 0.62 0.63 Doriopsilla albopunctala 0.5 0.8 0.3 - 0.38 0.32 Hermissenda crassicomis - - 0.8 0.8 0.38 0.43 Tethya californiana 0.5 0.5 0.3 0.3 0.38 0.14 Anfhop/eura artemisia 0.3 0.3 0.5 0.3 0.31 0.12 Eudisly/ia polymorpha - 0.8 0.5 - 0.31 0.38 Pelecypoda boring 0.3 - 0.3 0.8 0.31 0.31 Octopus spp. 0.8 - 0.3 - 0.25 0.35 Cal/iostoma /igalum 0.8 - - - 0.19 0.38 Okenia rosacea 0.3 0.3 - 0.3 0.19 0.1 2 Ophioplocus esmarki 0.5 0.3 - - 0.19 0.24 Pisaster!Henricia spp. Uuv.) 0.3 0.3 - 0.3 0.19 0.12 Placiphorella velata 0.3 0.3 0.3 - 0.19 0.12 Oiopatra ornala - - 0.3 0.3 0.12 0.14 Lotlia pet/a - - 0.5 - 0.12 0.25 Ophiopferis papil/osa - 0.5 - - 0.12 0.25 Sabellidae - 0.5 - - 0.12 0.25 Sipuncula - 0.5 - - 0.12 0.25 Diau/u/a sandiegensis - - - 0.3 <0,1 0.12 Fissure/la volcano - 0.3 - - <0.1 0.12 Megathura crenulata - - 0.3 - <0.1 0.12 Mitra idea 0.3 - - - <0.1 0.12 Mopalia spp. - - 0.3 - <0.1 0.12 Nemertea - 0.3 - - <0.1 0.12 Phidiana hiltoni - - 0.3 - <0.1 0.12 Pododesmus cepio - - 0.3 - <0.1 0.12 Pomaulax gibberosa 0.3 - - - <0.1 0.12 Pseudome/afoma torosa - - 0.3 - <0.1 0.12 C' ESLO2021-02 E-1

Appendix E - Subtidal Algae and Invertebrates Table E2. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m2) , standard deviations and annual means, North Diablo Cove Station NDC 2 -3m (8-10).

Survey 188 189 190 191 Survey Date 12-Mar-20 20-Apr-20 21-Jul-20 20-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Sargassum muticum 57.3 49.5 1.3 . 27.00 30.62 Cystoseira osmundacea 7.8 10.0 3.8 2.3 5.94 3.57 Macrocystis pyrifera . - 0.3 0.5 0.1 9 0.24 Invertebrates Strongy/ocentrotus purpuratus 181 .5 218.3 115.5 165.0 170.06 42.64 Acmaea mitra 20.3 12.8 4.5 5.3 10.69 7.38 Anthop/eura e/egantissima 8.8 7.8 3.3 7.5 6.81 2.44 Epiactis prolifera 2.0 4.8 14.0 4.8 6.38 5.25 Ophiothrix spiculata 5.8 7.3 1.5 5.8 5.06 2.48 Serpulidae 3.8 4.3 - 4.8 3.19 2.16 Strongy/ocentrotus franciscanus 0.5 1.0 0.3 1.0 0.69 0.38 Tonicella lineata 0.8 0.8 - 0.8* 0.56 0.38 Mitra idea - - 1.3 0.3 0.38 0.60 Sabellidae 1.0 0.3 - - 0.31 0.47 Crassadoma gigantea 0.5 - - 0.5 0.25 0.29 Doris spp. - 0.5 - 0.5 0.25 0.29 Placiphorella vela/a 0.5 0.5 - - 0.25 0.29 Pferopurpura festiva 0.3 0.8 - - 0.25 0.35 Eudistylia polymorpha - - - 0.8 0.19 0.38 Ophiopteris papillosa 0.5 0.3 - - 0.19 0.24 Megathura crenulata 0.3 0.3 - - 0.12 0.14 Serpulorbis squamigerus 0.3 - - 0.3 0.12 0.14 Aeo/idia papil/osa - - 0.3 - <0.1 0.12 Anthopleura artemisia - - - 0.3 <0.1 0.12 Boltenia villosa - - - 0.3 <0.1 0.12 Ceratostoma nut/a/Ii - - 0.3 - <0.1 0.12 Diopatra ornata 0.3 - - - <0.1 0.12 Mexichromis porterae - 0.3 - - <0.1 0.12 Mopalia spp. - 0.3 - - <0.1 0.12 Nemertea 0.3 - - - <0.1 0.12 Urticina spp. - - - 0.3 <0.1 0.12 C' ESLO2021-02 E-2

Append ix E - Subtidal Algae and Invertebrates Ta ble E3 . Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m2), standard deviations and annual means, North Diablo Cove Station NDC 3 -3m (9-10).

Survey 188 189 190 191 Survey Date 13-Mar-20 05-May-20 22-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Sargassum muticum 72.3 177.0 108.3 293.0 162.62 97.17 Cystoseira osmundacea 15.5 24.3 16.3 24.3 20.06 4.84 Macrocystis pyrifera - 0.3 2.0 1.5 0.94 0.97 Invertebrates Strongy/ocentrotus purpuratus 364.5 191 .8 203.8 320.8 270.19 85.67 Ophiothrix spiculata 4.5 6.0 7.0 7.8 6.31 1.40 Anthopleura elegantissima 6.0 5.3 7.3 6.0 6.12 0.83 Epiactis pro/ifera - 5.8 6.3 6.5 4.62 3.10 Acmaea mitre 3.8 7.5 0.8 5.3 4.31 2.83 Serpulidae 4.3 5.3 3.5 4.3 4.31 0.72 Anthopleura spp. - - - 13.5 3.38 6.75 Anthozoa 11.3 - - - 2.81 5.62 Strongy/ocentrotus franciscanus - 1.0 0.5 1.5 0.75 0.65 Pteropurpura festive 0.5 1.3 1.0 - 0.69 0.55 Mitra idea 0.8 - 1.3 0.5 0.62 0.52 Megathura crenulata 0.5 1.0 - - 0.38 0.48 Sabellidae - 0.8 0.3 - 0.25 0.35 Crassadoma gigantea - 0.3 - 0.5 0.19 0.24 Ophiactis simplex - 0.8 - - 0.19 0.38 Pelecypoda boring 0.5 - . 0.3 0.19 0.24 Cucumaria spp. - 0.5 - - 0.12 0.25 Diaulu/a sandiegensis 0.3 - - 0.3 0.12 0.14 Doris spp. - - - 0.5 0.12 0.25 Pagurus spp. 0.3 0.3 - - 0.12 0.14 Pododesmus cepio 0.3 0.3 - - 0.12 0.14 Aeo/idia papillosa - - 0.3 - <0.1 0.12 Ci rratulidaefT erebellidae - - - 0.3 <0.1 0.12 Diodora spp. - - - 0.3 <0.1 0.12 Ooriopsilla a/bopunctata 0.3 - - - <0.1 0.12 Eudistylia polymorpha - - 0.3 - <0.1 0.12 Ha/iotis spp. - - - 0.3 <0.1 0.12 Hermissenda crassicornis - - 0.3 <0.1 0.12 Mopa/ia spp. - 0.3 - - <0.1 0.12 Nemertea - - - 0.3 <0.1 0.12 Ophiopteris papillosa - 0.3 - <0.1 0.12 Panda/us spp. - - - 0.3 <0.1 0.12 Panulirus interruptus 0.3 - - - <0.1 0.12 Parastichopus spp. - 0.3 - - <0.1 0.12 Placiphorella vela/a - - - 0.3 <0.1 0.12 Platyhelminthes - - 0.3 - <0.1 0.12 C' ESLO2021-02 E-3

Appendix E - Subtidal Algae and Invertebrates Table E4. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2), standard deviations and annual means, North Diablo Cove Station NDC 4 -4m (9-15).

Survey 188 189 190 191 Survey Date 04-Mar-20 29-Apr-20 23-Jul-20 12-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Al gae Laminariales - 0.5 - - 0.12 0.25 Invertebrates Strongylocentrotus purpuratus 224.8 290.5 300.0 216.3 257.88 43.47 Serpulidae 24.5 23.5 29.0 33.0 27.50 4.38 Ophiothrix spicu/ata 19.0 9.8 39.8 14.0 20.62 13.30 Anthop/eura elegantissima 19.8 18.5 16.3 12.0 16.62 3.41 Acmaea mitra 27.8 18.8 3.0 7.5 14.25 11.17 Serpulorbis squamigerus 5.8 6.3 17.8 4.8 8.62 6.12 Strongylocentrotus franciscanus 3.3 3.8 4.5 4.5 4.00 0.61 Placiphore/la vela/a 1.8 1.0 1.8 0.3 1.19 0.72 Cucumaria spp. 0.5 1.5 1.8 0.5 1.06 0.66 Pelecypoda boring - 0.5 3.0 0.5 1.00 1.35 Ophiopteris papi/losa 1.5 1.0 0.5 0.5 0.88 0.48 Mitra idae - - 2.8 0.5 0.81 1.31 Patiria miniata 0.8 0.5 0.8 1.0 0.75 0.20 Sabellidae 1.0 1.0 1.0 - 0.75 0.50 Crassadoma gigantea 1.3 0.5 0.5 0.5 0.69 0.38 Tethya califomiana 0.5 1.0 0.5 0.8 0.69 0.24 Eudistylia polymorpha - 0.5 1.0 1.0 0.62 0.48 Epiactis prolifera 0.3 1.8 0.3 - 0.56 0.80 Pferopurpura festiva - 0.8 1.0 0.3 0.50 0.46 Diopatra omata 0.8 0.5 - 0.5 0.44 0.31 Pododesmus cepio 0.3 0.3 0.8 0.5 0.44 0.24 Anthop/eura artemisia 0.8 0.5 - 0.3 0.38 0.32 Parastichopus spp. 0.5 0.8 0.3 - 0.38 0.32 Haliotis spp. 0.3 0.3 - 0.3 0.19 0.12 Tonicella lineata - - 0.8 - 0.19 0.38 Cypraea spadicea - - 0.5 - 0.12 0.25 Diodora spp. - - - 0.5 0.12 0.25 Megathura crenulata - 0.3 - 0.3 0.12 0.14 Nemertea - - 0.3 0.3 0.12 0.14 Okenia rosacea - - - 0.5 0.12 0.25 Pseudochama spp. 0.3 0.3 - - 0.12 0.14 Diau/u/a sandiegensis - - - 0.3 <0.1 0.12 Lysmata ca/ifomica - - 0.3 - <0.1 0.12 Octopus spp. 0.3 - - - <0.1 0.12 C' ESLO2021-02 E-4

Append ix E - Subtidal Algae and Invertebrates Ta ble ES. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2), standard deviations and annual means, South Diablo Cove Station SDC 2 -3m (12-10).

Survey 188 189 190 191 Survey Date 07-Feb-20 29-May-20 12-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cystoseira osmundacea 1.8 . - - 0.44 0.88 Sargassum muticum - - 0.8 - 0.19 0.38 Invertebrates Strongy/ocentrotus purpuratus 200.8 209.0 161 .3 214.3 196.31 24.03 Ophiothrix spicu/ata 25.0 6.8 31.8 8.3 17.94 12.38 Serpulorbis squamigerus 17.0 17.0 15.3 17.5 16.69 0.99 Diopatra ornata 100 5.0 18.5 15.0 12.12 5.89 Serpulidae 8.0 9.5 10.8 5.0 8.31 2.48 Strongy/ocentrotus franciscanus 6.3 3.8 6.0 5.5 5.38 1.13 Anthopleura e/egantissima 5.8 3.5 5.3 4.3 4.69 1.01 Patiria miniata 0.8 1.5 2.3 5.3 2.44 1.97 Pleropurpura festive 5.0 0.5 3.5 0.8 2.44 2.18 Mitra idea 2.0 0.5 4.3 2.8 2.38 1.56 Acmaea mitra 2.3 0.8 3.8 2.3 2.25 1.22 Conus californicus - 0.3 7.5 - 1.94 3.71 Cucumaria spp. 2.3 2.8 2.5 0.3 1.94 1.14 Anthop/eura artemisia 0.3 0.3 2.3 1.0 0.94 0.94 Pelecypoda boring 0.5 1.3 1.3 - 0.75 0.61 Ophiopteris papil/osa 1.0 0.3 0.3 0.8 0.56 0.38 Pagurus spp. 0.5 - 0.8 1.0 0.56 0.43 Doriopsilla a/bopunctata 0.5 1.3 - - 0.44 0.59 Crassadoma gigantea 0.3 0.3 0.5 0.3 0.31 0.12 Pachycerianthus fimbriatus 0.5 - 0.3 0.5 0.31 0.24 Ci rratulidae/Terebellidae - - 1.0 - 0.25 0.50 Ha/campa decemtentaculata - - 0.8 0.3 0.25 0.35 Octopus spp. 0.5 0.3 - 0.3 0.25 0.20 Sabellidae - 0.8 - 0.3 0.25 0.35 Tethya californiana 0.3 0.3 0.3 0.3 0.25 <0.1 Amphiodia occidenta/is - - 0.8 - 0.19 0.38 Cypraea spadicea 0.5 - - 0.3 0.19 0.24 Epiactis pro/ifera - 0.5 - - 0.12 0.25 Anthozoa - 0.3 - - <0.1 0.12 Babakina festiva - - 0.3 - <0.1 0.12 Bo/tenia vil/osa 0.3 - - - <0.1 0.12 Crangon spp. - - 0.3 - <0.1 0.12 Oiodora spp. - - - 0.3 <0.1 0.12 Doris spp. - - - 0.3 <0.1 0.12 Haliotis spp. - - 0.3 - <0.1 0.12 Heptacarpus spp. 0.3 - - - <0.1 0.12 Hermissenda crassicornis - - 0.3 - <0.1 0.12 Lissothuria nutriens - - - 0.3 <0.1 0.12 Loxorhynchus spp. - - - 0.3 <0.1 0.12 Lytechinus anamesus - - - 0.3 <0.1 0.12 Maxwellia gemma 0.3 - - - <0.1 0.12 Megathura crenulata - 0.3 - - <0.1 0.12 (table continued)

~ ESLO2021-02 E-5

Appendix E - Subtidal Algae and Invertebrates Table ES (continued). Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m2), standard deviations and annual means, South Diablo Cove Station SDC 2 -3m (12-10).

Survey 188 189 190 191 Survey Date 07-Feb-20 29-May-20 12-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrates (continued)

Madia/us spp. - - 0.3 - <0.1 0.12 Myti/us spp. 0.3 - - - <0.1 0.12 Nemertea - - 0.3 - <0.1 0.12 Panda/us spp. - - 0.3 - <0.1 0.12 Parastichopus spp. 0.3 - - - <0.1 0.12 Roma/eon antennarius - - 0.3 - <0.1 0.12 t' ESLO2021 -02 E-6 L

Appendix E - Subtidal Algae and Invertebrates Table E6. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2), standard deviations and annual means, South Diablo Cove Station SDC 3 -4m (10-15).

Survey 188 189 190 191 Survey Date 11-Feb-20 18-Jun-20 11 -Aug-20 21-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cystoseira osmundacea 7.3 3.0 5.8 5.8 5.44 1.77 Macrocystis pyrifera 0.5 3.3 6.3 1.5 2.88 2.52 Laminariales 1.3 6.0 . . 1.81 2.85 Pferygophora californica . . 1.8 0.3 0.50 0.84 Laminaria setchellii 0.3 . 1.0 0.5 0.44 0.43 Sargassum muticum . 0.5 0.3 . 0.19 0.24 Invertebrates Strongy/ocentrotus purpuratus 218.8 158.8 175.0 190.0 185.62 25.51 Serpulorbis squamigerus 24.0 23.5 17.8 24.8 22.50 3.21 Anthop/eura elegantissima 17.5 13.8 19.8 22.3 18.31 3.61 Diopatra ornate 9.8 0.8 2.5 6.0 4.75 3.98 Mitra idae 4.3 2.0 3.3 8.5 4.50 2.82 Pferopurpura festive 1.3 1.3 3.3 6.5 3.06 2.48 Anthop/eura artemisia 1.0 1.8 3.8 4.5 2.75 1.65 Ganus californicus . . 3.8 5.3 2.25 2.67 Serpulidae 1.5 2.3 3.3 1.5 2.12 0.83 Cucumaria spp. 2.0 1.3 4.3 0.3 1.94 1.70 Acmaea mitra 1.5 3.0 0.8 0.8 1.50 1.06 Strongy/ocentrotus franciscanus 2.3 . 1.3 1.8 1.31 0.97 Boltenia villosa 0.5 0.5 0.5 2.8 1.06 1.12 Pelecypoda boring 1.0 0.5 1.5 0.5 0.88 0.48 Hermissenda crassicornis . 1.3 2.0 . 0.81 0.99 Pollicipes polymerus . . . 3.3 0.81 1.62 Ophiothrix spiculata . 0.3 2.5 0.3 0.75 1.17 Doriopsilla a/bopunctata 0.5 1.3 0.8 0.3 0.69 0.43 Cypraea spadicea 1.0 . 1.3 0.3 0.62 0.60 Kelletia kelletii . 0.5 0.3 1.8 0.62 0.78 Sabellidae 0.3 1.3 0.8 . 0.56 0.55 Diodora spp. 0.5 0.3 0.3 1..0 0.50 0.35 Patiria miniata 0.8 0.3 . 1.0 0.50 0.46 Pagurus spp. 0.5 . 0.8 0.5 0.44 0.31 Anthopleura spp. 0.8 0.8 . . 0.38 0.43 Crassadoma gigantea 0.5 0.3 . 0.8 0.38 0.32 Eudistylia polymorpha 0.3 0.3 0.5 0.5 0.38 0.14 Scyra acutifrons 0.3 . . 1.3 0.38 0.60 Cnemidocarpa finmarkiensis . 0.3 . 0.8 0.25 0.35 Ha/campa decemtentaculata . . 1.0 . 0.25 0.50 Pododesmus cepio . 0.5 . 0.5 0.25 0.29 CirratulidaefT erebellidae 0.3 . 0.5 . 0.19 0.24 Cryptochiton stelleri . . 0.3 0.5 0.19 0.24 Megathura crenulata 0.5 . 0.3 . 0.1 9 0.24 Ophiopteris papillosa 0.3 0.3 . 0.3 0.19 0.12 Pachycerianthus fimbriatus . 0.3 . 0.5 0.19 0.24 Pseudochama spp. . . 0.5 0.3 0.19 0.24 Tonicel/a lineata . 0.8 . . 0.1 9 0.38 Urticina spp. 0.3 . 0.3 0.3 0.19 0.12 (table continued)

~ Eslo2021-02 E-7

Appendix E - Subtidal Algae and Invertebrates Table E6 (continued). Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2) , standard deviations and annual means, South Diablo Cove Station SDC 3 -4m (10-15).

Survey 188 189 190 191 Survey Date 11 -Feb-20 18-Jun-20 11-Aug-20 21-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrates (continued)

Haliotis spp. . 0.3 0.3 - 0.12 0.14 Panda/us spp. - - 0.5 - 0.12 0.25 Pugettia spp. - - 0.5 - 0.12 0.25 Aphrodita spp. - - - 0.3 <0.1 0.12 Eupentacta quinquesemita 0.3 - - - <0.1 0.12 Hipponix spp. - - - 0.3 <0.1 0.12 Loxorhynchus spp. - - 0.3 - <0.1 0.12 Maxwellia gemma - - 0.3 - <0.1 0.12 Mimu/us fo/iatus - - - 0.3 <0.1 0.12 Ophiop/ocus esmarki - - - 0.3 <0.1 0.12 Paracyathus stearnsii 0.3 - - - <0.1 0.12 Parastichopus spp. - - - 0.3 <0.1 0.12 Placiphorella ve/ata - - - 0.3 <0.1 0.12 Pomau/ax gibberosa 0.3 - - - <0.1 0.12 Pomaulax undosa - - 0.3 - <0.1 0.12 Pseudomelatoma torosa 0.3 - - - <0.1 0.12 Slye/a spp. - - - 0.3 <0.1 0.12 Terebratalia transversa - - - 0.3 <0.1 0.12 p, ESLO2021 -02 E-8

Appendix E - Subtidal Algae and Invertebrates Table E7. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2), standard deviations and annual means, South Control Station SC 1 -3m (19-10).

Survey 188 189 190 191 Survey Date 05-Mar-20 25-Jun-20 30-Jul-20 21-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae Cystoseira osmundacea 12.0 12.0 20.3 19.0 15.81 4.43 Laminaria setchel/ii 4.8 2.8 1.5 1.8 2.69 1.48 P/erygophora californica 0.5 2.0 2.3 1.8 1.62 0.78 Invertebrates Chlorostoma brunnea 285.0 61.5 196.5 152.3 173.81 93.02 Pagurus spp. 134.5 11 .5 20.0 71.8 59.44 56.68 Strongylocentrotus purpuratus 25.0 11 .5 16.3 14.8 16.88 5.77 Acmaea mitra 10.5 18.8 12.8 9.0 12.75 4.29 Tonicel/a lineata 12.8 9.8 5.3 12.0 9.94 3.38 Patiria miniata 5.0 5.8 6.3 4.0 5.25 0.98 Calliostoma ligatum 6.8 1.5 1.5 6.0 3.94 2.83 Cryptochiton stelleri 3.3 2.5 2.3 3.5 2.88 0.60 C/avelina huntsmani - 6.5 0.8 - 1.81 3.14 Serpulorbis squamigerus 1.0 3.0 0.8 1.3 1.50 1.02 Anthopleura e/egantissima 2.0 1.8 1.3 0.8 1.44 0.55 Haliotis spp. 1.3 0.5 0.8 3.3 1.44 1.25 Leptasterias spp. 0.5 1.5 1.0 2.3 1.31 0.75 Pugettia spp. 1.3 0.3 0.5 1.8 0.94 0.69 Serpulidae 0.5 1.0 0.5 0.3 0.56 0.31 Ganus californicus - 1.5 0.3 0.3 0.50 0.68 Mopa/ia spp. - 0.8 0.5 0.5 0.44 0.31 Chlorostoma montereyi 0.8 - 0.8 - 0.38 0.43 Diau/ula sandiegensis - 1.3 - 0.3 0.38 0.60 Diopatra ornata 1.0 0.3 - 0.3 0.38 0.43 Doriopsilla albopunctata 0.5 1.0 - - 0.38 0.48 Diodora spp. 0.3 - 0.5 0.5 0.31 0.24 Mitra idae - 0.3 0.8 - 0.25 0.35 Pisaster/Henricia spp. Uuv.) - - - 1.0 0.25 0.50 Slye/a spp. 0.8 0.3 - - 0.25 0.35 Boltenia villosa 0.5 - - 0.3 0.19 0.24 Doris spp. - - 0.8 - 0.19 0.38 Okenia rosacea 0.3 0.3 0.3 - 0.19 0.12 Cryptolithodes sitchensis 0.5 - - - 0.1 2 0.25 Henricia /eviuscula - 0.3 0.3 - 0.1 2 0.14 Scyra acutifrons 0.3 - - 0.3 0.12 0.14 Urticina spp. 0.5 - - - 0.12 0.25 Anthopleura artemisia - - 0.3 - <0.1 0.12 Cnemidocarpa finmarkiensis 0.3 - - - <0.1 0.12 Cucumaria spp. 0.3 - - - <0.1 0.12 Eudistylia polymorpha - - - 0.3 <0.1 0.12 Mimulus foliatus - - 0.3 - <0.1 0.12 Placiphorel/a velata - - - 0.3 <0.1 0.12 Pododesmus cepio - - - 0.3 <0.1 0.12 Pomaulax gibberosa - - 0.3 - <0. 1 0.12 Pseudomelatoma torosa - - 0.3 - <0.1 0.12 Tethya californiana - - - 0.3 <0.1 0.12 Triooha catalinae - - - 0.3 <0.1 0.12

~ ESLO2021-02 E-9

Appendix E - Subtidal Algae and Invertebrates Table E8. Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 rn 2) , standard deviations and annual means, South Control Station SC 2 -6m (20-20).

Survey 188 189 190 191 Survey Date 26-Feb-20 11-Jun-20 25-Aug-20 28-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae P/erygophora californica 0.3 - - - <0.1 0.12 Invertebrates Serpulorbis squamigerus 311.3 302.5 211 .3 226.3 262.81 51 .37 Strongy/ocentrotus purpuratus 148.5 191 .3 144.0 148.5 158.06 22.23 Acmaea mitra 111.8 58.5 85.5 83.3 84.75 21.76 Ch/orostoma brunnea 64.5 99.8 46.5 43.5 63.56 25.85 Serpulidae 17.0 17.5 10.3 11.8 14.12 3.67 Tonicel/a lineata 14.3 7.5 13.5 16.5 12.94 3.84 Ophiothrix spicu/ata 8.0 1.3 10.3 13.3 8.19 5.10 Cal/iostoma /igatum 11 .3 6.0 8.3 6.8 8.06 2.32 Patiria miniata 4.0 3.5 5.3 6.8 4.88 1.45 Anthopleura e/egantissima 6.3 5.3 4.3 2.8 4.62 1.49 Pagurus spp. 4.3 4.3 2.8 5.8 4.25 1.22 Pododesmus cepio 3.0 1.8 3.3 3.0 2.75 0.68 Strongy/ocentrotus franciscanus 2.5 2.5 3.5 1.8 2.56 0.72 Chlorostoma montereyi 1.5 - 6.0 1.5 2.25 2.60 Cucumaria spp. 0.5 0.3 5.3 1.0 1.75 2.35 Eudistylia polymorpha 2.3 0.8 1.8 1.3 1.50 0.65 Placiphorella vela/a 0.5 1.5 1.0 1.8 1.19 0.55 Crassadoma gigantea 1.0 1.0 1.0 1.0 1.00 <0.1 Urticina spp. 0.3 0.8 1.0 1.0 0.75 0.35 Anthop/eura artemisia 0.5 1.0 0.5 0.5 0.62 0.25 Cryptochiton stelleri 1.3 - 1.0 0.3 0.62 0.60 Diodora spp. 1.0 0.5 0.3 0.8 0.62 0.32 Doriopsil/a albopunctata 0.8 0.8 1.0 - 0.62 0.43 Ceratostoma fo/iatum 0.5 0.8 0.5 0.5 0.56 0.12 Leptasterias spp. 0.3 0.5 1.0 0.5 0.56 0.31 Tethya ca/iforniana 0.5 0.5 0.5 0.5 0.50 <0.1 Mytilus spp. 0.5 0.5 0.3 0.5 0.44 0.12 Pisaster!Henricia spp. Uuv.) 1.0 0.3 - 0.5 0.44 0.43 Mitra idae 0.5 0.8 0.3 - 0.38 0.32 Ophiop/ocus esmarki 0.5 - - 1.0 0.38 0.48 Cnemidocarpa finmarkiensis 0.5 - 0.3 0.5 0.31 0.24 Ke/letia kelletii 0.3 0.8 0.3 - 0.31 0.31 Boltenia vi/losa 0.3 - 0.5 - 0.19 0.24 Cirratu lidae!Terebellidae 0.3 0.3 - 0.3 0.19 0.12 Ganus californicus - - 0.5 0.3 0.19 0.24 Diopatra ornata 0.5 - 0.3 - 0.19 0.24 Henricia Jeviuscula - - 0.8 - 0.19 0.38 Ophiopteris papil/osa 0.3 - 0.5 0.19 0.24 Pachyche/es spp. - - - 0.8 0.19 0.38 Pomau/ax gibberosa - - 0.8 - 0.19 0.38 Ba/anus spp. 0.5 - - - 0.12 0.25 Cad/ina spp. - - - 0.5 0.12 0.25 (table continued) t' ESLO2021-02 E-10

Appendix E - Subtidal Algae and Invertebrates Table E8 (continued). Subtidal algae and invertebrates (SAQ Method) 2020 survey means (abundance per 7 m 2), standard deviations and annual means, South Control Station SC 2 -6m (20-20).

Survey 188 189 190 191 Survey Date 26-Feb-20 11-Jun-20 25-Aug-20 28-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrates (continued)

Clavelina huntsmani - - - 0.5 0.12 0.25 Parastichopus spp. - - 0.5 - 0.12 0.25 Pisaster ochraceus - 0.5 - - 0.12 0.25 Anlhopleura spp. - 0.3 - - <0.1 0.12 Halcampa decemlenlacu/a/a - - - 0.3 <0.1 0.1 2 Mega/hura crenulata 0.3 - - - <0.1 0.12 Mimu/us fo/iatus - - - 0.3 <0.1 0.12 Nereididae - - - 0.3 <0.1 0.12 Paraxanthias taylori - - 0.3 - <0.1 0.12 Pisaster giganteus - 0.3 - - <0.1 0.12 Roma/eon antennarius - - - 0.3 <0.1 0.12 Sabellidae - - - 0.3 <0.1 0.12 Spheciospongia confoederala 0.3 - - - <0.1 0. 12 Stenoplax spp. - 0.3 - - <0.1 0.12 Slye/a spp. - - - 0.3 <0.1 0.12 C' ESLO2021 -02 E-11

Diablo Canyon Power Plant Appendix F Subtidal Algae (SLC Method)

Appendix F - Subtidal Algae Table Fl. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, Field's Cove Station FC 1 -3m (22-10).

Survey 188 189 190 191 Survey Date 21-Feb-20 09-Jul-20 28-Jul-20 08-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae non-coralline crust 31.0 52.0 54.0 55.0 48.00 11.40 coralline crust 46.0 26.0 22.0 28.0 30.50 10.63 Chrysophyta - <0.1 - 3.0 0.75 1.50 Calliarthron/Bossiella spp.-complex 0.5 <0.1 1.0 0.5 0.51 0.41 Chlorophyta (filamentous) <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Chondracanthus corymbiferus <0.1 <0.1 - <0.1 <0.01 <001 filamentous red algae complex - <0.1 <0.1 - <0.01 <0.01 Ha/icystis ova/is (Derbesia marina) - - <0.1 <0.1 <0.01 <0.01 Opuntiel/a ca/ifomica <0.1 - <0.1 <0.1 <0.01 <0.01 Pferosiphonia dendroidea <0.1 - <0.1 <0.1 <0.01 <0.01 Cal/ophyllis flabellulata - - <0.1 - <0.01 <0.01 Callophyllis spp. - - - <0.1 <0.01 <0.01 Rhodymenia spp. <0.1 - <0.1 - <0.01 <0.01 Bryopsis spp. - - - <0.1 <0.01 <0.01 Codium fragile subsp. californicum - - <0.1 - <0.01 <0.01 Cryptopleura vio/acea <0.1 - - - <0.01 <0.01 Halymenia/Schizymenia spp.-complex - - <0.1 - <0.01 <0.01 Prionitis spp. - - - <0.1 <0.01 <0.01 Rhodophyta Uuv. blades) <0.1 - - - <0.01 <0.01 Invertebrates Anthopleura e/egantissima 0.5 - - - 0.12 0.25 Tetrac/ita rubescens - - 0.5 - 0.12 0.25 Substrates colonized rock 75.0 71 .5 70.0 75.0 72.88 2.53 rock 14.5 16.0 18.0 9.5 14.50 3.63 colonized cobble 3.0 6.5 7.5 9.0 6.50 2.55 cobble 6.5 5.0 4.0 6.0 5.38 1.11 sand (shell Qravel) 0.5 1.0 0.5 0.5 0.62 0.25 C' ESLO2021-02 F-1

Append ix F - Subtidal Algae Table F2. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, North Diablo Cove Station NDC 2 -3m (8-10).

Survey 188 189 190 191 Survey Date 12-Mar-20 20-Apr-20 21-Jul-20 20-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 44.5 50.5 46.5 67.0 52.12 10.23 Acrosorium ciliolatum 23.5 15.0 7.5 33.0 19.75 10.99 Sargassum muticum 20.0 11 .5 3.5 2.0 9.25 8.29 Chlorophyta (filamentous) 2.5 6.5 10.0 10.0 7.25 3.57 Cal/iarthron/Bossiella spp.-complex 3.5 5.5 10.0 4.0 5.75 2.96 Chrysophyta 8.0 6.5 2.0 0.5 4.25 3.57 filamentous red algae complex 1.0 4.5 9.0 0.5 3.75 3.92 Colpomenia spp. 4.5 3.0 6.0 <0.1 3.38 2.56 Cystoseira osmundacea 1.0 2.0 2.0 1.5 1.63 0.48 Pferosiphonia dendroidea 2.5 3.0 - - 1.38 1.60 Cryptopleura violacea <0.1 0.5 4.5 - 1.25 2.18 Ectocarpales 1.5 1.5 1.0 0.5 1.13 0.48 Codium fragile subsp. californicum <0.1 1.0 3.0 <0.1 1.01 1.41 Farlowia/Pikea spp.-complex 1.0 1.5 0.5 1.0 1.00 0.41 non-coralline crust 2.0 2.0 <0.1 <0.1 1.00 1.15 Dictyota binghamiae 1.0 - 2.0 0.5 0.88 0.85 Cal/ithamnion spp./Pleonosporium spp. 2.5 <0.1 - <0.1 0.63 1.25 U/va spp. 0.5 0.5 1.0 <0.1 0.50 0.41 Corallina chilensis 0.5 0.5 0.5 - 0.38 0.25 C/adophora spp. 0.5 - - - 0.1 3 0.25 Ge/idium robustum <0.1 <0.1 0.5 <0. 1 0.13 0.25 Rhodophyta Uuv. blades) <0.1 0.5 - - 0.13 0.25 Ha/icystis ova/is (Derbesia marina) 0.5 <0. 1 - - 0.13 0.25 Laminariales <0.1 - - - <0.01 <0.01 Macrocystis pyrifera - - <0.1 <0. 1 <0.01 <0.01 Bryopsis spp. <0. 1 - - - <0.01 <0.01 Cal/ophyl/is spp. <0.1 - - - <0.01 <0.01 Chondracanthus corymbiferus - <0.1 - - <0.01 <0.01 Prionitis spp. - - <0.1 - <0.01 <0.01 Rhodymenia spp. - - <0.1 - <0.01 <0.01 Invertebrates Phragmatopoma californica - - - 1.0 0.25 0.50 Substrates colonized rock 59.5 61 .5 74.0 67.0 65.50 6.49 colonized cobble 35.5 32.5 10.5 20.5 24.75 11 .50 sand (shell gravel) 3.5 5.0 6.5 1.0 4.00 2.35 cobble 1.5 1.0 7.5 5.5 3.88 3.15 rock - - 1.5 6.0 1.88 2.84 C' ESLO2021-02 F-2

Appendix F - Subtidal Algae Ta ble F3. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, North Diablo Cove Station NOC 3 -3m (9-10).

Survey 188 189 190 191 Survey Date 13-Mar-20 05-May-20 22-Jul-20 30-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 46.5 43.0 41.0 85.0 53.88 20.87 Acrosorium ciliolatum 41 .0 7.5 17.0 45.5 27.75 18.41 Sargassum muticum 20.0 20.5 6.5 19.5 16.63 6.76 Chrysophyta 4.0 33.5 3.5 . 10.25 15.60 Cystoseira osmundacea 5.5 10.0 7.0 3.0 6.38 2.93 Calliarthron/Bossiella spp.-complex 5.0 2.5 9.5 6.0 5.75 2.90 filamentous red algae complex 4.0 <0.1 17.0 1.5 5.63 7.76 Co/pomenia spp. 0.5 4.5 16.0 <0.1 5.25 7.44 Chlorophyta (filamentous) 2.0 <0.1 2.5 <0.1 1.13 1.31 Callithamnion spp./Pleonosporium spp. 4.5 <0.1 - - 1.13 2.25 Farlowia/Pikea spp.-complex 0.5 1.0 <0.1 2.5 1.01 1.08 U/va spp. 0.5 1.5 1.5 <0.1 0.88 0.75 Pterosiphonia dendroidea 1.0 1.0 - 1.0 0.75 0.50 non-coralline crust <0.1 0.5 <0.1 1.0 0.38 0.48 Prionitis spp. 0.5 <0.1 1.0 <0.1 0.38 0.48 Die/yo/a binghamiae <0.1 - 1.5 <0.1 0.38 0.75 Ectocarpales 1.0 0.5 <0.1 <0.1 0.38 0.48 Corallina chilensis <0.1 0.5 0.5 - 0.25 0.29 Gelidium robustum 0.5 <0.1 <0.1 <0.1 0.13 0.25 Macrocystis pyrifera - 0.5 <0.1 <0.1 0.13 0.25 Neoptilota spp. 0.5 - - - 0.12 0.25 Codium fragile subsp. califomicum <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Rhodymenia spp. <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Cryptopleura vio/acea - <0.1 <0.1 <0.1 <0.01 <0.01 Ha/icystis ova/is (Oerbesia marina) <0.1 <0.1 - <0.1 <0.01 <0.01 Bryopsis spp. <0.1 - - - <0.01 <0.01 Callophyl/is spp. <0.1 <0.1 - . <0.01 <0.01 Rhodophyta Uuv. blades) - <0.1 . . <0.01 <0.01 Laminariales <0.1 . - . <0.01 <0.01 Antithamnion/Pterothamnion spp.-complex . . <0.1 - <0.01 <0.01 Cal/ophyl/is flabel/ulata . <0.1 . . <0.01 <0.01 Chondracanthus corymbiferus . <0.1 - . <0.01 <0.01 Cladophora spp. <0.1 . - . <0.01 <0.01 Sarcodiotheca gaudichaudii <0.1 . - . <0.01 <0.01 Invertebrates Anthop/eura elegantissima . 0.5 . . 0.12 0.25 Substrates colonized rock 82.5 75.5 82.5 87.5 82.00 4.93 colonized cobble 16.0 20.0 6.0 6.5 12.12 6.98 sand (shell gravel) 1.0 4.0 5.5 . 2.62 2.56 rock 0.5 . 3.5 4.5 2.12 2.21 cobble - 0.5 2.5 1.5 1.1 2 1.11 C' ES LO2021-02 F-3

Appendix F - Subtidal Algae Table F4. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, North Diablo Cove Station NDC 4 -4m (9-15).

Survey 188 189 190 191 Survey Date 04-Mar-20 29-Apr-20 23-Jul-20 12-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 75.0 67.0 59.0 69.5 67.62 6.65 Chrysophyta . 20.5 3.5 . 6.00 9.81 non-coralline crust 4.5 3.0 2.0 7.0 4.13 2.18 Chlorophyta (filamentous) 2.5 4.0 9.0 0.5 4.00 3.63 Cal/iarthron!Bossiel/a spp.-complex 4.0 5.5 3.0 3.0 3.88 1.18 filamentous red algae complex 3.5 - <0.1 1.0 1.13 1.65 Pterosiphonia dendroidea 4.5 - - <0.1 1.13 2.25 Ectocarpales <0.1 2.0 <0.1 <0.1 0.50 1.00 Cal/ithamnion spp.!Pleonosporium spp. - 1.0 - - 0.25 0.50 Ulva spp. - 1.0 - - 0.25 0.50 Acrosorium ciliolatum <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Rhodymenia spp. <0. 1 - <0. 1 <0. 1 <0.01 <0.01 Colpomenia spp. <0. 1 <0.1 - - <0.01 <0.01 Codium fragile subsp. californicum <0. 1 <0.1 - - <0.01 <0.01 Dictyota binghamiae <0.1 - - - <0.01 <0 01 Laminariales - <0.1 - - <0.01 <0.01 Bryopsis spp. <0.1 - - - <0.01 <0.01 Callophyl/is f/abel/ulata - - - <0.1 <0.01 <0.01 Cryptopleura violacea <0.1 - - - <0.01 <001 Ha/icystis ova/is (Derbesia marina) - - - <0.1 <0.01 <0.01 Rhodophyta Uuv blades) <0.1 - - - <0.01 <0.01 Invertebrates Phragmatopoma ca/ifornica 1.0 0.5 - 2.5 1.00 1.08 Anthopleura e/egantissima 1.0 1.0 1.0 - 0.75 0.50 Serpulidae - 1.0 - - 0.25 0.50 Serpulorbis squamigerus 0.5 - - - 0.12 0.25 Substrates colonized rock 81.0 80.5 67.5 77.5 76.62 6.28 rock 9.0 2.5 12.0 15.5 9.75 5.52 colonized cobble 8.0 12.5 7.5 4.5 8.12 3.30 sand (shell gravel) 0.5 4.0 11 .5 0.5 4.12 5.19 cobble 1.5 0.5 1.5 1.5 1.25 0.50 C' ESLO2021-02 F-4

Append ix F - Subtidal Algae Ta ble FS. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, South Diablo Cove Station SDC 2 -3m (12-10).

Survey 188 189 190 191 Survey Date 07-Feb-20 29-May-20 12-Aug-20 13-Nov-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 48.0 49.5 55.0 68.5 55.25 9.33 Chrysophyta 4.0 8.0 8.5 4.0 6.13 2.46 Cal/iarthron/Bossiel/a spp.-complex 3.0 4.0 4.0 3.0 3.50 0.58 non-coralline crust 4.5 1.5 4.0 2.0 3.00 1.47 filamentous red algae complex 3.5 2.5 1.0 1.5 2.13 1.11 Plerosiphonia dendroidea 4.0 0.5 - <0. 1 1.13 1.93 Chlorophyta (filamentous) <0.1 2.5 0.5 - 0.75 1.19 Acrosorium ci/io/atum <0.1 0.5 <0.1 <0. 1 0.13 0.25 Ectocarpales <0. 1 0.5 <0. 1 <0. 1 0.13 0.25 Ulva spp. . 0.5 <0. 1 <0.1 0.13 0.25 Antithamnion/Plerothamnion spp. - 0.5 - - 0.13 0.25 Cal/ithamnion spp./Pleonosporium spp. - - - 0.5 0.13 0.25 Dictyota binghamiae - - 0.5 - 0.12 0.25 Rhodymenia spp. <0.1 <0. 1 <0. 1 <0.1 0.01 <0.01 Co/pomenia spp. <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Prionitis spp. - <0. 1 - <0.1 <0.01 <0.01 Rhodophyta Uuv. blades) <0.1 <0.1 <0.1 - <0.01 <0.01 Sargassum muticum - - <0.1 - <0.01 <0.01 Bryopsis spp. <0.1 - - <0. 1 <0.01 <0.01 Codium fragile subsp. ca/ifomicum <0.1 <0.1 - - <0.01 <0.01 Cora/Jina chilensis <0.1 - - - <0.01 <0.01 Cryptopleura violacea - - - <0.1 <0.01 <0.01 Cystoseira osmundacea <0.1 - - - <0.01 <0.01 Far/owia!Pikea spp.-complex - <0.1 - - <0.01 <0.01 Halicystis ova/is (Derbesia marina) - - - <0.1 <0.01 <0 01 Nienburgia andersoniana - - <0.1 - <0.01 <0.01 Invertebrates Phragmatopoma californica 5.5 3.5 0.5 1.5 2.75 2.22 Serpulorbis squamigerus 0.5 0.5 - 1.0 0.50 0.41 Serpulidae - 0.5 - - 0.12 0.25 Substrates colonized rock 59.0 57.0 55.5 56.5 57.00 1.47 sand (shell gravel) 4.0 15.0 27.5 10.5 14.25 9.92 colonized cobble 5.5 13.5 10.5 22.5 13.00 7.14 rock 18.5 5.5 5.0 5.5 8.62 6.59 C' ESLO2021-02 F-5

Appendix F - Subtidal Algae Table F6. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, South Diab lo Cove Station SDC 3 -4m (I 0-15).

Survey 188 189 190 191 Survey Date 11-Feb-20 18-Jun-20 11-Aug-20 21-Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std . Dev.

Algae coralline crust 52.5 64.0 51.5 66.0 58.50 7.56 Chrysophyta - 7.5 25.5 7.5 10.12 10.84 Cal/iarthron/Bossiella spp.-complex 13.5 9.5 8.0 6.0 9.25 3.18 filamentous red algae complex 8.5 17.0 9.0 2.0 9.1 3 6.14 non-coralline crust 4.5 5.5 4.0 9.5 5.88 2.50 Rhodymenia spp. - 2.0 3.0 1.0 1.50 1.29 Cystoseira osmundacea <0.1 0.5 0.5 1.0 0.51 0.41 Pterosiphonia dendroidea - - - 1.5 0.38 0.75 Co/pomenia spp. <0.1 0.5 0.5 - 0.26 0.29 Callophyllis flabellulata - 0.5 0.5 <0.1 0.25 0.29 Macrocystis pyrifera <0. 1 <0.1 <0.1 0.5 0.1 3 0.25 Laminariales <0.1 0.5 <0.1 - 0.13 0.25 Callophyllis spp. - 0.5 <0.1 - 0.1 3 0.25 Prionitis spp. 0.5 <0.1 - - 0.13 0.25 Pterygophora ca/ifornica - - 0.5 - 0.13 0.25 Chondracanthus corymbiferus - - 0.5 - 0.13 0.25 Corallina chilensis 0.5 - - - 0.12 0.25 Nienburgia andersoniana - - 0.5 - 0.12 0.25 Farlowia/Pikea spp.-complex - <0.1 <0. 1 <0.1 0.01 0.01 Acrosorium ciliolatum - <0.1 - <0.1 <0.01 0.01 Ectocarpales <0.1 <0.1 <0. 1 - <0.01 <0.01 Fauchea laciniata - <0. 1 <0.1 - <0.01 <0.01 Sargassum muticum - <0.1 <0.1 <0. 1 <0.01 <0.01 Rhodophyta Uuv. blades) <0.1 - <0. 1 - <0.01 <0.01 Die/yo/a binghamiae - <0.1 <0. 1 - <0.01 <0.01 Ulva spp. - <0. 1 - - <0.01 <0.01 Ahnfe/tiopsis linearis - - <0.1 - <0.01 <0.01 Bryopsis spp. - - <0. 1 <0. 1 <0.01 <0.01 Chlorophyta (filamentous) - <0.1 - <0.1 <0.01 <0.01 Cryptopleura ruprechtiana - <0.1 <0.1 - <0.01 <0.01 Cryptop/eura vio/acea - <0.1 - - <0.01 <0.01 Laminaria setchel/ii - - <0.1 - <0.01 <0.01 Scinaia confusa - - <0.1 - <0.01 <0.01 Desmarestia tabacoides - <0.1 - - <0.01 <0.01 Ge/idium robustum - <0.1 - - <0.01 <0.01 Halicystis ova/is (Derbesia marina) - - - <0.1 <0.01 <0.01 Halymenia/Schizymenia spp.-complex - <0.1 - - <0.01 <0.01 Opuntiel/a ca/ifornica - - - <0.1 <0.01 <0.01 Rhodoptilum p/umosum - - <0. 1 - <0.01 <001 (table continued)

C' ESLO2021-02 F-6

Append ix F - Subtidal Algae Table F6 (continued). Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, South Diablo Cove Station SDC 3 -4m (10-15).

Survey 188 189 190 191 Survey Date 11-Feb-20 18-Jun-20 11-Aug-20 21 -Dec-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrates Anthopleura eleganlissima . 1.5 . 2.0 0.88 1.03 Serpulorbis squamigerus . 1.5 . 0.5 0.50 0.71 Phragmatopoma californica . . . 1.0 0.25 0.50 Balanophyllia e/egans . 0.5 . . 0.12 0.25 Substrates colonized rock 69.5 80.0 74.5 79.0 75.75 4.80 cobble 13.5 9.0 3.5 5.0 7.75 4.48 sand (shell gravel) 10.5 4.0 13.5 2.0 7.50 5.40 colonized cobble 4.5 4.5 8.5 3.5 5.25 2.22 rock 2.0 2.5 . 10.5 3.75 4.63 C' ESLO2021 -02 F-7

Appendi x F - Subtidal Algae Table F7. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, South Control Station SC 1 -3m (19-10).

Survey 188 189 190 191 Survey Date 05-Mar-20 25-Jun-20 30-Jul-20 21-Oct-20 Annu al Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 34.5 38.5 54.5 39.0 41.62 8.82 Rhodymenia spp. 25.5 30.0 31.0 23.5 27.50 3.58 Cal/iarthron/Bossiella spp.-complex 20.5 22.5 32.5 32.0 26.88 6.26 Cystoseira osmundacea 18.0 14.0 4.0 10.0 11.50 5.97 non-coralline crust 7.5 8.5 7.0 10.0 8.25 1.32 Chondracanthus corymbiferus 5.5 5.5 8.5 8.5 7.00 1.73 Farlowia/Pikea spp.-complex 1.5 2.5 2.0 2.0 2.01 0.41 Cryptop/eura ruprechtiana 2.0 1.0 1.0 2.5 1.63 0.75 Callophyllis spp. 0.5 0.5 2.5 <0. 1 0.88 1.11 Cryptop/eura vio/acea 1.0 1.0 0.5 1.0 0.88 0.25 Plerosiphonia dendroidea 0.5 0.5 1.5 1.0 0.88 0.48 Prionitis spp. 1.0 <0.1 0.5 0.5 0.51 0.41 Plocamium pacificum 0.5 0.5 0.5 0.5 0.51 <0.01 Gelidium robustum <0.1 <0.1 10 0.5 0.38 0.48 Fredericqia chi/on 0.5 <0.1 <0.1 1.0 0.38 0.48 Ahnfeltiopsis linearis <0.1 <0.1 0.5 0.5 0.26 0.29 Microcladia coulteri - <0.1 <0.1 1.0 0.25 0.50 Laminaria setchellii <0. 1 0.5 <0. 1 <0. 1 0.13 0.25 Plerygophora californica <0. 1 0.5 <0.1 <0. 1 0.13 0.25 Prionitis austra/is 0.5 <0.1 - <0.1 0.13 0.25 Callophyllis flabellulata <0. 1 <0.1 <0. 1 <0. 1 0.01 <0.01 C/athromorphum parcum <0. 1 <0.1 <0. 1 <0. 1 0.01 <0.01 Ulva spp. - <0.1 <0. 1 <0. 1 <0.01 <0.01 Phyllospadix spp. <0. 1 - <0.1 <0. 1 <0.01 <0 01 Oictyoneurum californicum - <0.1 <0.1 <0.1 <0.01 <0.01 Fauchea lacinia/a <0.1 - - <0.1 <0.01 <0.01 Osmundea spp. - - <0. 1 <0.1 <0.01 <0.01 filamentous red algae complex - - <0. 1 - <0.01 <0.01 Co/pomenia spp. - - - <0. 1 <0.01 <0.01 Corallina chilensis - - <0.1 - <0.01 <0.01 Oictyota binghamiae - - - <0. 1 <0.01 <001 Gastroclonium subarticulatum - - - <0. 1 <0.01 <0.01 Halicystis ova/is (Derbesia marina) - - - <0. 1 <0.01 <0.01 Laminariales - - - <0.1 <0.01 <0.01 Invertebrates Phragma/opoma californica 8.0 6.0 15.5 6.5 9.00 4.42 Substrates colonized rock 82.5 86.0 92.5 86.0 86.75 4.17 colonized cobble 10.5 10.0 1.5 13.0 8.75 5.01 sand (shell gravel) 5.0 2.0 3.0 1.0 2.75 1.71 cobble 2.0 1.5 1.5 - 1.25 0.87 rock 0.5 1.5 - 0.50 0.71 C' ESLO2021-02 F-8

Append ix F - Subtidal Algae Ta ble F8. Subtidal algae (SLC Method) 2020 survey means (percent cover), standard deviations and annual means, South Control Station SC 2 -6m (20-20).

Survey 188 189 190 191 Survey Date 26-Feb-20 11-Jun-20 25-Aug-20 28-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Algae coralline crust 66.0 54.0 49.5 57.5 56.75 6.98 non-coralline crust 24.5 27.5 25.5 35.0 28.12 4.75 Calliarthron/Bossiel/a spp.-complex 4.0 0.5 2.5 1.5 2.13 1.49 Weeksia spp. 1.0 1.0 4.5 1.0 1.88 1.75 Opuntiella californica 1.0 0.5 <0.1 1.0 0.63 0.48 Rhodymenia spp. <0.1 <0.1 0.5 <0.1 0.13 0.25 Callophyl/is f/abel/u/ata <0.1 0.5 <0.1 <0.1 0.13 0.25 Fauchea /aciniata <0.1 <0.1 <0.1 <0. 1 0.01 <0.01 Ha/icystis ova/is (Oerbesia marina) <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Cryptop/eura violacea <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Chondracanthus corymbiferus <0.1 <0.1 - <0.1 <0.01 <0.01 Plerosiphonia dendroidea <0.1 <0.1 <0.1 <0.1 <0.01 <0.01 Chlorophyta (filamentous) <0.1 <0.1 - - <0.01 <0.01 Membranoptera/Branchioglossum spp. <0.1 - - <0.1 <0.01 <0.01 Callophyllis spp. <0.1 <0.1 - - <0.01 <0.01 Die/yo/a binghamiae <0.1 <0.1 - - <0.01 <0.01 Laminaria setchellii <0.1 - - - <0.01 <0.01 Laminariales - <0.1 - - <0.01 <0.01 Pugetia firma <0. 1 - - - <0.01 <0.01 Ulva spp. - <0.1 <0.1 - <0.01 <0.01 Cryptopleura ruprechtiana <0.1 - - - <0.01 <0.01 filamentous red algae complex <0.1 - - - <0.01 <0.01 Plerygophora californica <0.1 - - - <0.01 <0.01 Invertebrates Serpulorbis squamigerus 5.5 5.0 4.5 3.5 4.62 0.85 Tetrac/ita rubescens - 2.0 - - 0.50 1.00 Phragmatopoma californica - 1.0 - - 0.25 0.50 Serpulidae - - - 1.0 0.25 0.50 Anthop/eura e/egantissima - - - 0.5 0.12 0.25 tunicates, compound/social 0.5 - - - 0.12 0.25 Substrates colonized rock 84.0 85.5 79.0 82.0 82.62 2.81 colonized cobble 130 2.5 3.5 14.5 8.38 6.25 rock 3.0 10.5 16.5 2.0 8.00 6.82 sand (shell gravel) - 0.5 1.0 1.5 0.75 0.65 cobble - 1.0 - - 0.25 0.50 C' ESLO2021-02 F-9

Diab/a Canyon Power Plant Appendix G Subtidal Invertebrates (SFQ Method)

Appendix G - Subtidal Invertebrates Table Gl. Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2 ; percent cover) standard deviations and annual means, Field's Cove Station FC 1 -3m (22-10).

Survey 188 189 190 191 Survey Date 21-Feb-20 09-Jul-20 28-Jul-20 08-Oct-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Strongy/ocentrotus purpuratus 11 .8 14.8 15.5 9.0 12.75 2.98 Acmaea mitra 6.3 5.5 3.8 6.3 5.44 1.18 Balanus/Tetraclita spp. 8.0 4.0 3.8 2.0 4.44 2.54 Lottiidae 3.3 4.0 2.8 4.8 3.69 0.88 Lotlia ochracea 5.0 2.3 2.5 4.3 3.50 1.34 Sabellidae - 8.8 1.3 - 2.50 4.21 Fissure/la volcano 3.8 2.8 2.0 1.0 2.38 1.16 Pelecypoda boring - 7.0 1.5 0.8 2.31 3.18 Chlorostoma brunnea - - 0.3 6.5 1.69 3.21 Serpulidae 1.3 0.8 1.8 1.8 1.38 0.48 Phragmatopoma californica 3.5 1.0 - 0.3 1.19 1.60 Crepidula spp. - - 1.5 1.0 0.62 0.75 Homolopoma /uridum/Lirularia succincta 1.8 0.3 0.3 0.3 0.62 0.75 Serpulorbis squamigerus 0.8 0.3 0.5 0.8 0.56 0.24 Diodora spp. 0.3 0.5 0.5 0.8 0.50 0.20 Pagurus spp. 0.8 - 1.3 - 0.50 0.61 Lissothuria nutriens 0.5 0.3 0.5 0.3 0.38 0.14 Aptyxis Juteopictus 0.3 1.0 - - 0.31 0.47 Tonicella lineata 0.5 0.3 0.3 0.3 0.31 0.12 Cirratulidae/T erebellidae 0.5 - 0.5 - 0.25 0.29 lschnochitonidae 0.5 0.3 0.3 - 0.25 0.20 Leptasterias spp. - 0.3 0.3 0.5 0.25 0.20 Mitra idae - - 0.3 0.5 0.19 0.24 Octopus spp. 0.5 - 0.3 - 0.19 0.24 Patiria miniata - 0.3 0.3 0.3 0.19 0.12 Ha/iotis spp. - 0.5 - - 0.12 0.25 Polychaeta - - 0.5 - 0.12 0.25 Pseudochama spp. - 0.3 - 0.3 0.12 0.14 Amphissa spp. 0.3 - - - 0.06 0.12 Anthop/eura e/egantissima 0.3 - - - 0.06 0.12 Cucumaria spp. 0.3 - - - 0.06 0.12 Dendropoma spp. 0.3 - - - 0.06 0.12 Majidae - - - 0.3 0.06 0.12 Ocinebrina spp. 0.3 - - - 0.06 0.12 Ophiothrix spiculata - - 0.3 - 0.06 0.12 Pododesmus cepio - 0.3 - - 0.06 0.12 Pyura haustor - - - 0.3 0.06 0.12 Williamia peltoides 0.3 - - - 0.06 0.12 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Hydroidolina <0.1 <0. 1 <0. 1 - 0.01 0.01 Bryozoa (encrusting) <0. 1 <0.1 <0.1 <0.1 0.01 <0.01 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 0.01 <0.01 Spirorbidae <0.1 <0.1 - - 0.01 0.01 Dodecaceria fewkesi - <0.1 - <0.1 <0.01 <0.01 Sa/macina tribranchiata <0.1 - - <0.1 <0.01 <0.01 p ESLO2021-02 G-1

Append ix G - Subtidal Invertebrates Table G2. Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2; percent cover) standard devi ations and annual means, North Diablo Cove Station NOC 2 -3m (8-10).

Survey 188 189 190 191 Survey Date 12-Mar-20 20-Apr-20 21-Jul-20 20-Oct-20 An nual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Strongylocentro/us purpuratus 15.8 19.5 15.0 23.5 18.44 3.91 Fissure/la volcano 4.5 8.8 6.0 7.8 6.75 1.88 Ophiaclis simplex 6.5 6.3 4.8 3.8 5.31 1.30 Phragmatopoma californica 4.3 4.3 0.3 5.3 3.50 2.22 Pelecypoda boring 1.5 2.3 3.3 1.8 2.19 077 Acmaea milra 3.3 2.5 1.5 1.3 2.12 0.92 Epiactis prolifera . 0.8 2.8 3.3 1.69 1.56 Anthozoa 0.5 2.0 3.5 0.3 1.56 1.51 Serpulidae 1.8 1.0 1.8 0.5 1.25 0.61 Lottiidae 0.8 0.8 1.8 1.5 1.19 0.52 Balanus!Tetraclita spp. 3.0 1.5 - - 1.12 1.44 Barleeia spp. - - - 3.8 0.94 1.88 Ophiothrix spiculata 0.3 1.0 0.3 1.0 0.62 0.43 Sipuncula - 1.3 0.3 0.8 0.56 0.55 Sabellidae 0.5 0.5 0.5 0.3 0.44 0.12 Chaetopteridae - - 0.3 1.0 0.31 0.47 Lottia ochracea 0.3 0.3 - 0.5 0.25 0.20 Pseudochama spp. 0.3 - 0.3 0.5 0.25 0.20 Alia spp. - - 0.8 - 0.19 0.38 Anthop/eura e/egantissima - 0.3 0.3 0.3 0.19 0.12 Cucumaria spp. 0.8 - - - 0.19 0.38 Pista spp. 0.5 - - 0.3 0.19 0.24 Ancula pacifica - - 0.5 - 0.12 0.25 Pododesmus cepio 0.3 - 0.3 - 0.12 0.14 Williamia peltoides - - 0.5 - 0.12 0.25 Amphissa spp. - - 0.3 - 0.06 0.12 Chamaspp. - 0.3 - - 0.06 0.12 Fissurellidea bimaculata - - 0.3 . 0.06 0.12 Hep/acarpus spp. - - 0.3 - 0.06 0.12 Lirobittium spp. 0.3 - - - 0.06 0.12 Lissothuria nutriens - 0.3 - - 0.06 0.12 Lophopanopeus spp. - - 0.3 - 0.06 0.12 Nemertea - - 0.3 - 0.06 0.12 Panda/us spp. - - - 0.3 0.06 0.12 Pferopurpura festiva - - 0.3 - 0.06 0.12 Scyra aculifrons - - - 0.3 0.06 0.12 Clathrina spp. <0.1 - - - 0.02 0.03 Porifera (encrusting) <0.1 <0.1 <0.1 <0. 1 0.01 0.01 Spirorbidae - <0.1 <0.1 <0. 1 0.01 0.01 Bryozoa (encrusting) - <0.1 <0.1 - <0.01 0.01 Dodecaceria fewkesi - - - <0.1 <0.01 0.01 tunicates, compound/social - <0.1 <0. 1 - <0.01 <0.01 Hvdroidolina - <0.1 - - <0.01 <0.01 C'- ESLO2021-02 G-2

Appendix G - Subtidal Invertebrates Ta ble G3 . Subtidal invertebrates (SFQ Method) 2020 su rvey means (abundance per 0.25 m 2 ; percent cover) standard deviations and annual means, North Diablo Cove Station NDC 3 -3m (9-10).

Survey 188 189 190 191 Survey Date 13-Mar-20 05-May-20 22-Jul-20 30-Nov-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Barleeia spp. 17.0 . . 50.0 16.75 23.57 Phragmatopoma californica 2.5 11 .5 3.8 7.5 6.31 4.06 Ophiactis simplex 11.3 2.3 1.8 6.3 5.38 4.40 Strongylocentrotus purpuratus 5.8 3.8 3.8 3.3 4.12 1.11 Anthozoa . 3.3 2.3 1.3 1.69 1.39 Pelecypoda boring 1.8 0.8 1.0 3.3 1.69 1.12 Fissure/la volcano 2.0 1.5 1.8 1.3 1.62 0.32 Oendropoma spp. . . - 6.3 1.56 3.12 Epiactis prolifera 2.5 0.8 1.3 0.5 1.25 0.89 Acmaea mitra 1.8 1.0 0.5 0.5 0.94 0.59 Lottiidae 0.8 - 0.5 2.0 0.81 0.85 Anthopleura elegantissima - 0.5 0.5 2.0 0.75 0.87 Pis/a spp. 0.3 2.3 0.5 - 0.75 1.02 Serpulidae 0.5 0.8 0.8 1.0 0.75 0.20 Sabellidae - 1.0 1.3 - 0.56 0.66 Ophiothrix spiculata - 0.3 - 1.5 0.44 0.72 Chaetopteridae - - 1.0 0.3 0.31 0.47 Sipuncula - 0.5 0.3 0.5 0.31 0.24 Alia spp. - - - 1.0 0.25 0.50 Mitra idae 0.5 0.3 0.3 - 0.25 0.20 Cucumaria spp. - 0.3 - 0.5 0.19 0.24 lschnochitonidae - 0.3 0.3 0.3 0.19 0.12 Lottia ochracea 0.5 - 0.3 - 0.19 0.24 P/eropurpura festiva - 0.8 - - 0.19 0.38 Pugettia spp. 0.5 - - 0.3 0.19 0.24 Lissothuria nulriens - - - 0.5 0.12 0.25 Nereididae 0.5 - - - 0.12 0.25 Williamia peltoides 0.3 0.3 - - 0.12 0.14 Balanus/Tetrac/ita spp. - 0.3 - - 0.06 0.12 Diopatra ornata 0.3 - - - 0.06 0.12 Fissurellidea bimaculata - 0.3 - - 0.06 0.12 Hermissenda crassicornis - - 0.3 - 0.06 0.12 Hipponix spp. 0.3 - - - 0.06 0.12 Lacuna spp. - - - 0.3 0.06 0.12 Laila cockerelli - - - 0.3 0.06 0.12 Nemertea - - - 0.3 0.06 0.12 Pododesmus cepio 0.3 - - - 0.06 0.12 Pycnogonida - - 0.3 - 0.06 0.12 Scyra acutifrons 0.3 - - - 0.06 0.12 Tonicel/a lineata 0.3 - - 0.06 0.12 Spirorbidae - <0.1 <0.1 0.1 0.04 0.06 Porifera (encrusting) <0.1 <0. 1 <0.1 <0.1 0.01 0.01 tunicates, compound/social <0. 1 <0.1 <0.1 <0. 1 0.01 <0.01 Bryozoa (encrusting) <0. 1 <0. 1 <0.1 - <0.01 <0.01 Hvdroidolina <0. 1 - - - <0.01 0.01 t' ESLO2021-02 G-3

Appendix G - Subtidal Invertebrates Table G4 . Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2; percent cover) standard deviations and annual means, North Diablo Cove Station NDC 4 -4m (9-15).

Survey 188 189 190 191 Survey Date 04-Mar-20 29-Apr-20 23-Jul-20 12-Nov-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Phragmatopoma californica 29.0 46.8 13.8 21 .8 27.81 14.08 Pelecypoda boring 19.8 31 .8 32.3 10.5 23.56 10.45 Strongylocentrotus purpuratus 15.3 14.3 15.3 15.8 15.12 0.63 Ophiactis simplex 4.5 8.0 9.5 5.5 6.88 2.29 Serpulidae 3.5 4.3 5.3 4.3 4.31 0.72 Fissure/la volcano 3.5 3.0 2.8 3.0 3.06 0.31 Ophiothrix spiculata 1.0 1.3 3.5 5.3 2.75 2.01 Lottiidae 2.3 0.5 4.0 1.8 2.12 1.45 Serpulorbis squamigerus 2.5 2.0 0.8 1.5 1.69 0.75 Lottia ochracea 3.0 - 1.8 1.8 1.62 1.23 Acmaea mitra 1.8 1.5 1.0 1.0 1.31 0.38 Anthopleura elegantissima 2.0 0.8 1.3 1.3 1.31 0.52 Balanus!Tetraclita spp. 2.0 1.3 0.8 1.3 1.31 0.52 Sipuncula 1.0 1.0 1.0 0.8 0.94 0.12 Sabellidae 0.8 1.0 1.3 - 0.75 0.54 Epiactis prolifera 1.5 0.8 0.3 - 0.62 0.66 Mitra idae . 0.3 1.3 0.5 0.50 0.54 Pseudochama spp. . - 0.5 1.3 0.44 0.59 Chaetopteridae - . 1.3 0.3 0.38 0.60 Strongylocentrotus franciscanus 0.3 - 0.3 0.3 0.19 0.12 Chamaspp. 0.3 0.3 . - 0.12 0.14 Pododesmus cepio 0.3 - - 0.3 0.12 0.14 Wil/iamia peltoides - 0.5 - - 0.12 0.25 Amphissa spp. - - - 0.3 0.06 0.12 Anthozoa - 0.3 - - 0.06 0.12 Cirratulidae/T erebellidae - 0.3 - - 0.06 0.12 Crassadoma gigantea - - - 0.3 0.06 0.12 Cucumaria spp. - - 0.3 - 0.06 0.12 Cypraea spadicea - - 0.3 - 0.06 0.1 2 Diodora spp. - - - 0.3 0.06 0.12 Lirobittium spp. - 0.3 - - 0.06 0.12 Megathura crenula/a - - - 0.3 0.06 0.12 Modiolus spp. - - 0.3 - 0.06 0.12 Placiphorella velata - - - 0.3 0.06 0.12 Pferopurpura festiva - 0.3 - - 0.06 0.12 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 0.02 0.01 Clathrina spp. - <0.1 - - 0.02 0.03 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 0.01 0.01 Hydroidolina <0.1 <0.1 <0.1 <0.1 0.01 <0.01 tunicates, compound/social <0.1 <0.1 <0.1 <0. 1 0.01 0.01 Salmacina tribranchiata - - - <0.1 <0.01 0.01 Spirorbidae <0. 1 <0.1 - - <0.01 0.01 Didemnum!Trididemnum soo. - - - <0. 1 <0.01 <0.01 p ESLO2021 -02 G-4

Append ix G - Subtidal Invertebrates Table GS. Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m 2; percent cover) standard deviations and annual means, South Diab lo Cove Station SDC 2 -3m (12-10).

Survey 188 189 190 191 Survey Date 07-Feb-20 29-May-20 12-Aug-20 13-Nov-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Ophiactis simplex 26.3 34.0 2.3 19.8 20.56 13.53 Strongylocentrotus purpuratus 14.5 9.3 14.3 15.0 13.25 2.68 Pelecypoda boring 5.3 17.0 5.0 14.8 10.50 6.27 Serpulorbis squamigerus 5.8 4.0 6.3 7.0 5.75 1.27 Serpulidae 4.5 6.5 5.5 4.5 5.25 0.96 Ophiothrix spiculata 4.3 0.8 4.0 3.3 3.06 1.60 Phragmatopoma californica 2.8 2.3 5.0 0.8 2.69 1.76 Chaetopteridae 1.0 0.3 0.5 8.3 2.50 3.85 Pis/aspp. 1.5 2.5 1.0 4.5 2.38 1.55 Mitra idae 2.8 - 5.8 0.3 2.19 2.68 Diopatra ornata 2.5 1.8 1.0 2.5 1.94 0.72 Sabellidae 1.0 4.0 2.0 - 1.75 1.71 Cucumaria spp. 0.8 2.5 0.5 2.0 1.44 0.97 Lottiidae - 0.8 1.5 2.8 1.25 1.17 Sipuncula 0.5 2.5 1.3 0.3 1.12 101 Acmaea mitra 1.3 0.5 0.8 0.8 0.81 0.31 Williamia peltoides 2.5 - 0.3 0.5 0.81 1.14 Lissothuria nutriens 0.8 0.8 1.0 0.5 0.75 0.20 Balanus/Tetraclita spp. 0.8 1.0 0.5 0.5 0.69 0.24 Crepidula spp. - - 0.3 2.3 0.62 1.09 Lottia ochracea 1.0 - 1.3 0.3 0.62 0.60 Cirratulidae/Terebellidae 0.8 0.3 0.3 0.8 0.50 0.29 Ganus califomicus 1.0 - 1.0 - 0.50 0.58 Pododesmus cepio 1.5 - 0.3 - 0.44 0.72 Strongylocentrotus franciscanus 0.8 0.5 0.3 0.3 0.44 0.24 Balanophyllia elegans 0.5 0.5 0.3 0.3 0.38 0.1 4 Fissure/la volcano 0.3 0.5 - 0.5 0.31 0.24 lschnochitonidae 0.5 0.8 - - 0.31 0.38 Patiria miniata - 0.8 0.3 0.3 0.31 0.31 Ophiuroidea 0.8 0.3 - - 0.25 0.35 Pferopurpura festiva 0.5 0.3 0.3 - 0.25 0.20 Nemertea - - 0.3 0.5 0.19 0.24 Pseudochama spp. - 0.5 0.3 - 0.19 0.24 Anthopleura artemisia 0.3 - 0.3 - 0.12 0.14 Modiolus spp. 0.3 - 0.3 - 0.12 0.14 Ophiopteris papillosa - - - 0.5 0.12 0.25 Polychaeta - 0.5 - - 0.12 0.25 Amphissa spp. 0.3 - - - 0.06 0.12 Anthopleura elegantissima - - 0.3 - 0.06 0.12 Doriopsil/a albopunctata - 0.3 - - 0.06 0.12 Epiactis prolifera 0.3 - - - 0.06 0.12 Epitonium/Opalia spp. - - - 0.3 0.06 0.12 Euoentacta auinauesemita - 0.3 - - 0.06 0.12 (table continued) t' ESLO2021-02 G-5

Appendix G - Subtidal Invertebrates Table GS (continued) . Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m 2 ;

percent cover) standard deviations and annual means, South Diablo Cove Station SDC 2 -3m (12-10).

Survey 188 189 190 191 Survey Date 07-Feb-20 29-May-20 12-Aug-20 13-Nov-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Heptacarpus spp. - - - 0.3 0.06 0.12 lsopoda - - - 0.3 0.06 0.12 Lophopanopeus spp. - 0.3 - - 0.06 0.12 Ophiop/ocus esmarki - - 0.3 - 0.06 0.12 Pagurus spp. - - - 0.3 0.06 0.12 Ric/axis punctocaelatus - - - 0.3 0.06 0.12 Bryozoa (encrusting) <0.1 - <0. 1 <0.1 0.02 0.03 tunicates, compound/social <0.1 - - <0.1 0.01 0.01 Porifera (encrusting) <0. 1 <0. 1 <0. 1 - <0.01 <0.01 Hydroidolina - - - <0.1 <0.01 0.01 Spirorbidae <0.1 - <0.1 - <0.01 <0.01 C' ESLO2021-02 G-6

Append ix G - Subtid al Inverteb rates Table G6. Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m 2; percent cover) standard deviations and annual means, South Diablo Cove Station SDC 3 -4m (10-15) .

Survey 188 189 190 191 Survey Date 11-Feb-20 18-Jun-20 11-Aug-20 21-Dec-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Balanophyllia elegans 19.8 12.3 7.8 16.5 14.06 5.21 Strongylocentrotus purpuratus 12.5 13.3 10.0 13.8 12.38 1.66 Serpulorbis squamigerus 7.0 6.8 10.8 7.8 8.06 1.84 Pelecypoda boring 7.3 6.3 1.5 1.0 4.00 3.21 Corynactis ca/ifornica 2.8 7.5 4.3 . 3,62 3.13 Ophiactis simplex 7.3 5.5 0.3 0.8 3.44 3.47 Anthopleura elegantissima 1.8 2.5 2.0 2.5 2.19 0.38 Chaetopteridae - 1.3 5.8 0.5 1.88 2.63 Phragmatopoma californica 2.3 1.5 0.3 3.0 1.75 1.17 Serpulidae 0.8 2.3 2.0 1.3 1.56 0.69 Mitra idae 2.0 0.5 0.8 2.3 1.38 0.88 Pteropurpura festiva 1.0 1.5 0.5 2.0 1.25 0.65 Ganus californicus 1.0 0.3 0.3 2.8 1.06 1.18 Pista spp. 0.5 2.8 - 0.5 0,94 1.23 Sipuncula 2.0 1.0 0.3 0.3 0.88 0.83 Cucumaria spp. 2.0 0.8 - 0.5 0.81 0.85 Sabellidae - 0.5 1.5 1.3 0.81 0.69 Diopatra ornata 0.8 0.8 0.3 0.5 0.56 0.24 lschnochitonidae 0.8 1.3 - 0.3 0.56 0.55 Paracyathus stearnsii 0.5 0.8 0.5 0.5 0.56 0.12 Acmaea mitra 1.3 - - 0.8 0.50 0.61 Anthopleura artemisia 0.3 0.8 0.3 0.5 0.44 0.24 Ophiothrix spiculata 0.5 1.0 - - 0.38 0.48 Leucilla nuttingi 1.3 - - - 0.31 0.62 Diodora spp. - 0.3 - 0.8 0.25 0.35 Scyra acutifrons 0.8 - - 0.3 0.25 0.35 CirratulidaefTerebellidae 0.3 0.5 - - 0.19 0.24 Doriopsil/a a/bopunctata - 0.8 - - 0.19 0.38 Ke/letia kelletii - - - 0.8 0.19 0.38 Lirobitlium spp. 0.3 0.5 - - 0.19 0.24 Lissolhuria nutriens - 0.3 0.5 - 0.19 0.24 Pagurus spp. 0.3 - 0.5 - 0.19 0.24 Amphissa spp. - 0.3 0.3 - 0.12 0.14 Anthozoa 0.3 0.3 - - 0.12 0.14 Balanus/Telrac/ita spp. 0.3 - - 0.3 0.12 0.14 Cypraea spadicea - - 0.5 - 0.12 0.25 Epitonium/Opalia spp. - 0.3 - 0.3 0.12 0.14 Heplacarpus spp. 0.3 - - 0.3 0.12 0.14 Lottiidae - - 0.5 - 0.12 0.25 Majidae - - 0.3 0.3 0.12 0.14 Ophiopteris papillosa - - 0.3 0.3 0.12 0.14 Pseudochama soo. - 0.3 - 0.3 0.12 0.14 (table continued) p ESLO2021-02 G-7

Appendix G - Subtida l Inve rtebrates Table G6. (continued) Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m 2; percent cover) standard deviations and annual means, South Diablo Cove Station SDC 3 -4m (10-15).

Survey 188 189 190 191 Survey Date 11-Feb-20 18-Jun-20 11 -Aug-20 21-Dec-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrates Counts (continued)

Alia spp. - - - 0.3 0.06 0.12 Cadlina spp. 0.3 - - - 0.06 0.12 Cancridae 0.3 . - - 0.06 0.12 Ceratostoma foliatum - . - 0.3 0.06 0.12 Crassadoma gigantea - 0.3 - - 0.06 0.12 Epiactis prolifera 0.3 - - - 0.06 0.12 Modiolus spp. - 0.3 - . 0.06 0.12 Ophiop/ocus esmarki . . 0.3 . 0.06 0.12 Phidiana hiltoni - 0.3 - . 0.06 0.12 P/aciphorella ve/ata 0.3 - - - 0.06 0.12 Pugettia spp. - - - 0.3 0.06 0.12 Williamia peltoides - - 0.3 - 0.06 0.12 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 0.03 <0.01 Porifera (encrusting) <0.1 <0.1 <0. 1 <0. 1 0.02 <0.01 tunicates, compound/social - <0.1 <0. 1 <0. 1 0.02 0.01 Acanthancora cyanocrypta - <0.1 <0. 1 <0.1 0.02 0.01 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.02 0.01 Hydroidolina <0.1 <0.1 <0.1 - 0.01 0.01 Abiet.!Serfularella/Serfularia spp. - - . <0. 1 <0.01 <0.01 Oidemnum/Trididemnum spp. - . - <0. 1 <0.01 <001 Salmacina tribranchiata - <0.1 - - <0.01 <001 p, ESL02021-02 G-8

Appendix G - Subtidal Invertebrates Table G7. Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2; percent cover) standard deviations and annual means, South Control Station SC 1 -3m (19-10).

Survey 188 189 190 191 Survey Date 05-Mar-20 25-Jun-20 30-Jul-20 21-Oct-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Phragmatopoma californica 149.3 165.8 54.3 31 .3 100.12 67.25 Ch/orostoma brunnea 16.0 9.5 4.5 11 .0 10.25 4.73 Homolopoma /uridum/Lirularia succincla 8.5 5.8 5.3 6.8 6.56 1.43 Pagurus spp. 7.3 8.8 7.0 2.8 6.44 2.58 Strongy/ocentrotus purpuratus 5.8 4.3 3.3 6.3 4.88 1.38 Tonicella lineala 1.8 1.8 1.5 2.3 1.81 0.31 Clavelina huntsmani . 7.0 . . 1.75 3.50 Acmaea milra 2.5 1.3 1.5 0.8 1.50 0.74 Ba/anus/Te/raclita spp. 1.3 0.8 1.3 1.8 1.25 0.41 Lissothuria nutriens 1.0 1.0 0.8 1.5 1.06 0.31 Leptasterias spp. . 0.8 0.8 1.5 0.75 0.61 Serpulidae 0.5 0.8 0.5 1.0 0.69 0.24 Balanophyllia e/egans 0.3 0.5 0.5 0.8 0.50 0.20 Cal/iostoma /igatum 0.3 0.5 0.8 0.5 0.50 0.20 Amphissa spp. . 0.3 0.5 0.5 0.31 0.24 Cryptochiton stelleri 0.3 0.3 . 0.8 0.31 0.31 Oiopatra ornata 0.3 0.3 0.5 0.3 0.31 0.12 lschnochitonidae 0.3 0.5 0.3 0.3 0.31 0.12 Patiria miniata 0.3 0.5 0.3 0.3 0.31 0.12 Pista spp. 0.3 0.3 0.3 0.5 0.31 0.12 Serpulorbis squamigerus 1.0 0.3 - - 0.31 0.47 Anthopleura elegantissima 0.3 0.3 0.3 0.3 0.25 <0.01 Oendropoma spp. - - - 1.0 0.25 0.50 Sabellidae - - 0.3 0.8 0.25 0.35 Slye/a spp. 0.3 0.3 0.3 0.3 0.25 <0.01 Cryp/olithodes sitchensis 0.3 0.3 - 0.3 0.19 0.12 Ocinebrina spp. - 0.3 0.3 0.3 0.19 0.12 Scyra acutifrons 0.3 0.3 - 0.3 0.19 0.12 Chelyosoma productum 0.3 - 0.3 - 0.12 0.14 Ganus ca/ifornicus - 0.3 - 0.3 0.12 0.14 Epiaclis prolifera - - 0.5 - 0.12 0.25 Eupentacta quinquesemita - - 0.3 0.3 0.12 0.14 Lottiidae - - 0.5 - 0.12 0.25 Mitra idae 0.3 - 0.3 - 0.12 0.14 Mytilus spp. - - - 0.5 0.12 0.25 Pododesmus cepio - 0.3 - 0.3 0.12 0.14 Pugettia spp. . 0.3 0.3 - 0.12 0.14 Alia spp. - - 0.3 - 0.06 0.12 Anthopleura artemisia - 0.3 - - 0.06 0.12 Aptyxis luteopic/us - - - 0.3 0.06 0.12 Diodora spp. - - 0.3 - 0.06 0.12 Doris SOD. - - - 0.3 0.06 0.12 (table continued) p, ESLO2021-02 G-9

Appendix G - Subtidal Invertebrates Table G7 (continued). Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m 2; percent cover) standard deviations and annual means, South Control Station SC 1 -3m (19-10).

Survey 188 189 190 191 Survey Date 05-Mar-20 25-Jun-20 30-Jul-20 21-Oct-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Fissure/la volcano - 0.3 - - 0.06 0.12 Hermissenda crassicornis - - 0.3 - 0.06 0.12

/do/easpp. - 0.3 - - 0.06 0.12 Lepidozona spp. - - 0.3 - 0.06 0.12 Lophopanopeus spp. - - - 0.3 0.06 0.12 Lottia ochracea - - 0.3 - 0.06 0.12 Mimulus foliatus - - - 0.3 0.06 0.12 Mopalia spp. - - 0.3 - 0.06 0.12 Pelecypoda boring - 0.3 - - 0.06 0.12 Pisaster/Henricia spp. Uuv.) - - 0.3 - 0.06 0.12 Pomaulax gibberosa - - - 0.3 0.06 0.12 Promartynia pu/Jigo 0.3 - - - 0.06 0.12 Porifera (encrusting) <0.1 <0.1 <0.1 <0.1 0.03 <0.01 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 0.02 <0.01 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 0.02 0.01 Spirorbidae <0.1 <0.1 <0.1 <0.1 0.01 0.01 Didemnum/Trididemnum spp. <0.1 - <0.1 - <0.01 <0.01 Hydroidolina - - <0. 1 - <0.01 0.01 Salmacina tribranchiata - - <0.1 - <0.01 <0.01 Fissure/la volcano - 0.3 - - 0.06 0.12 C' ESLO2021-02 G-10

Appendix G - Subtidal Invertebrates Table G8 . Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2 ; percent cover) standard deviations and annual means, South Control Station SC 2 -6m (20-20).

Survey 188 189 190 191 Survey Date 26-Feb-20 11-Jun-20 25-Aug-20 28-Oct-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts Serpulorbis squamigerus 24.0 27.0 17.0 30.8 24.69 5.82 Ch/orostoma brunnea 6.8 8.8 3.3 7.8 6.62 2.39 Strongylocentrotus purpuratus 6.3 5.0 6.0 6.8 6.00 0.74 Serpulidae 2.8 3.3 6.0 5.0 4.25 1.51 Acmaea mitra 4.0 3.3 5.5 3.5 4.06 1.01 Balanus/Tetrac/ita spp. 2.8 5.5 2.8 4.3 3.81 1.33 Williamia peltoides 6.0 5.5 0.3 0.5 3.06 3. 11 Corynactis californica 8.3 0.5 3.3 - 3.00 3.78 Lottiidae 1.5 3.5 3.0 3.0 2.75 0.87 Homolopoma luridum!Lirularia succincta 4.3 0.8 2.8 1.3 2.25 1.58 Tonicella lineata 1.3 1.5 1.8 3.0 1.88 0.78 Cal/iostoma ligatum 1.3 1.3 1.5 2.0 1.50 0.35 Balanophyllia e/egans 2.8 0.5 1.3 1.3 1.44 0.94 Phragmatopoma ca/ifornica 1.3 2.3 1.5 0.8 1.44 0.62 Cucumaria spp. 1.8 0.8 1.8 1.0 1.31 0.52 Lottia ochracea 3.0 0.5 0.8 0.5 1.19 1.21 Pelecypoda boring 0.8 2.3 1.0 0.3 1.06 0.85 Ophiothrix spiculata 0.5 0.5 1.8 1.0 0.94 0.59 Pagurus spp. 1.0 0.5 1.5 0.8 0.94 0.43 Aptyxis luteopictus 1.5 0.3 0.8 0.5 0.75 0.54 Chaetopteridae 0.5 0.5 0.5 1.3 0.69 0.38 Sabellidae - 1.8 1.0 - 0.69 0.85 Leptasterias spp. - 0.3 1.5 0.5 0.56 0.66 Ci rratulidaefT erebellidae 0.3 0.8 0.3 0.8 0.50 0.29 Diodora spp. 0.8 0.3 0.3 0.8 0.50 0.29 Ganus californicus 1.3 0.3 0.3 - 0.44 0.55 Crepidu/a spp. 1.3 0.3 - 0.3 0.44 0.55 Ophiactis simplex - 0.5 - 0.8 0.31 0.38 Pododesmus cepio 1.0 - - 0.3 0.31 0.47 Amphissa spp. 0.5 - 0.5 - 0.25 0.29 Anthop/eura artemisia 0.5 0.5 - - 0.25 0.29 Clavelina huntsmani - 1.0 - - 0.25 0.50 lschnochitonidae - - 0.5 0.5 0.25 0.29 Mitra idae 0.5 0.3 - 0.3 0.25 0.20 Patiria miniata 0.3 - - 0.8 0.25 0.35 Pisaster/Henricia spp. Uuv.) 0.5 - 0.5 - 0.25 0.29 Anthopleura elegantissima 0.3 0.3 - 0.3 0.19 0.12 Chlorostoma montereyi 0.5 0.3 - - 0.19 0.24 Fissure/la volcano - 0.3 - 0.5 0.19 0.24 Pomaulax gibberosa - 0.5 0.3 - 0.19 0.24 Promartynia pulligo - 0.3 0.3 0.3 0.19 0.12 Sipuncula - - 0.5 0.3 0.19 0.24 Tethya californiana 0.3 - 0.3 0.3 0.19 0.12 Alia spp. 0.3 - 0.3 - 0.12 0.14 Cnemidocarpa finmarkiensis - - - 0.5 0.12 0.25 Dendropoma spp. - - - 0.5 0.12 0.25 Eoiactis orolifera - - 0.3 0.3 0.12 0.14 (table continued)

C'-ESL02021-02 G-11

Append ix G - Subtidal Invertebrates Table G8 (continued). Subtidal invertebrates (SFQ Method) 2020 survey means (abundance per 0.25 m2; percent cover) .standard deviations and annual means, South Control Station SC 2 -6m (20-20).

Survey 188 189 190 191 Survey Date 26-Feb-20 11-Jun-20 25-Aug-20 28-Oct-20 Annual Mean Taxon Mean Mean Mean Mean Mean Std. Dev.

Invertebrate Counts (continued)

Eudisty/ia polymorpha - - - 0.5 0.12 0.25 Ocinebrina spp. - 0.3 0.3 - 0.12 0.14 Ophiop/ocus esmarki - 0.3 - 0.3 0.12 0.14 Pyura haustor - - - 0.5 0.12 0.25 Strongylocentrotus franciscanus - 0.3 - 0.3 0.12 0.14 Anthozoa - - 0.3 - 0.06 0.12 Ceratostoma fo/iatum - 0.3 - - 0.06 0.12 Crassadoma gigantea - 0.3 - - 0.06 0.12 Cryptochiton stelleri - - 0.3 - 0.06 0.12 Diopatra ornata 0.3 - - - 0.06 0.12 Eupentacta quinquesemita - - 0.3 - 0.06 0.12 Lepidozona spp. - - 0.3 - 0.06 0.12 Lissothuria nutriens 0.3 - - - 0.06 0.12 Pachycheles spp. - - 0.3 - 0.06 0.12 Paracyathus stearnsii 0.3 - - - 0.06 0.12 Pseudochama spp. - - 0.3 - 0.06 0.12 Porifera (encrusting) <0.1 <0.1 <0.1 0.1 0.05 0.06 tunicates, compound/social <0.1 <0.1 <0.1 <0.1 0.03 <0.01 Bryozoa (encrusting) <0.1 <0.1 <0.1 <0.1 0.03 <0.01 Hydroidolina - - <0.1 <0.1 0.01 0.01 Sa/macina tribranchiata <0.1 - <0.1 <0.1 0.01 0.01 Spirorbidae <0.1 - <0.1 <0.1 0.01 0.01 Bryozoa (erect) - - <0.1 <0.1 <0.01 0.01 Dodecaceria fewkesi - <0.1 <0.1 <0.1 <0.01 <0.01 p, ESLO2021-02 G-12

Diab/a Canyon Power Plant Appendix H Subtidal Fishes (SFO Method)

Append ix H - Subtidal Fishes Table Hl. Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, Field's Cove Stations (FC FO-1 (1), FC FO-2 (2), FC FO-3 (3)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Midwater Oxyjulis ea/iforniea 14.8 <0.1 . 2.3 4.31 7.10 larval/post-larval fish . 0.8 . . 0.21 0.42 Paralabrax elathratus 0.2 . <0.1 0.2 0. 10 0.08 Rhaeoehilus vaeea 0.2 . . . 0.06 0.12 Semieossyphus puleher 0.2 . . . 0.06 0.12 Oxyju/is ealiforniea Uuv.) . . . <0. 1 0.02 0.04 Rhaeoehilus vaeea Uuv.) . . <0. 1 . 0.02 0.04 Sebas/es mys/inus Uuv.) . <0.1 . . 0.02 0.04 Benthic Oxylebius pie/us 6.0 7.2 5.9 7.6 6.67 0.84 Oxyjulis ealiforniea 12.2 1.2 0.3 2.7 4.08 5.47 Sebastes mystinus (yoy) . 4.5 2.0 0.9 1.85 1.94 Sebastes ehrysomelas 1.2 2.8 1.0 0.5 1.38 0.97 Gibbonsia spp. 0.8 0.8 0.3 0.5 0.58 0.20 Semieossyphus pu/eher <0. 1 1.1 0.8 <0.1 0.50 0.50 Oxylebius pie/us Uuv.) . <0.1 . 1.7 0.44 0.82 Seorpaenieh/hys marmora/us 0.6 0.6 0.2 0.4 0.44 0.20 Paralabrax c/athratus 0.2 0.2 0.8 0.5 0.40 0.28 Rhinogobiops nieholsii 0.2 0.4 <0. 1 0.8 0.38 0.28 Sebas/es minialus (yoy) . . . 1.4 0.35 0.71 Sebastes atrovirens 0.4 0.4 0.2 0.2 0.33 0.10 Embiotoea jaeksoni 0.4 0.3 0.4 . 0.29 0.20 Sebas/es rastrelliger 0.2 0.5 0.2 0.2 0.29 0.14 Artedius spp. 0.2 0.3 0.2 0.2 0.21 0.08 Sebas/es mystinus Uuv.) 0.6 . 0.2 . 0.19 0.28 Embiotoea lateralis Uuv.) 0.3 <0.1 0.2 . 0.15 0.14 Rhaeoehilus vaeea 0.2 0.2 <0. 1 0.2 0.15 0.04 Sebas/es ehrysomelas Uuv.) 0.2 0.2 <0.1 . 0.12 0.11 Embio/oea /a/era/is . . 0.3 <0.1 0. 10 0.16 Sebastes melanops (yoy) . 0.2 0.2 . 0.1 0 0.12 Gobiesox maeandricus . 0.2 <0.1 <0.1 0.08 0.07 Sebastes serranoides!S. flavidus (yoy) . 0.2 . . 0.06 0.12 Braehyistius frenatus Uuv.) . . 0.2 . 0.04 0.08 Cebidiehthys violaeeus <0.1 <0. 1 . . 0.04 0.05 Embiotoea jaeksoni Uuv.) . . 0.2 . 0.04 0.08 Gibbonsia spp. Uuv.) . . 0.2 . 0.04 0.08 Oxyjulis ealiforniea Uuv.) . . . 0.2 0.04 0.08 Ar/edius spp. Uuv.) . <0.1 . . 0.02 0.04 Cottidae <0.1 . . . 0.02 0.04 O/igoeoltus spp. Uuv.) . <0. 1 . . 0.02 0.04 Orthonopias triaeis . . <0.1 . 0.02 0.04 Or/honopias triaeis Uuv.) . . <0. 1 . 0.02 0.04 Rhaeoehilus toxotes <0.1 . . . 0.02 0.04 Rhaeoehilus vaeea Uuv.) . . <0. 1 . 0.02 0.04 Se bastes rastrelliaer (vov) <0.1 . . . 0.02 0.04

~ ESLO2021-02 H-1

Appendix H - Subtidal Fish es Ta ble H2. Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, North Diab lo Cove Stations (NDC FO-1 (5), NDC FO-2 (6), NDC FO-3 (7)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Midwater larval/post-larval fish . 4.6 4.8 . 2.35 2.72 Chromis punc/ipinnis 1.2 1.0 1.1 0.7 0.98 0.22 Paralabrax clathratus 1.0 0.5 0.5 1.2 0.79 0.34 Hermosilla azurea 0.9 . - - 0.23 0.46 Gire/la nigricans 0.7 - 0.2 - 0.21 0.32 Medialuna californiensis 0.2 0.3 - - 0.12 0.16 Hypsypops rubicundus 0.3 - <0.1 - 0.10 0.16 Embiotoca jacksoni 0.2 - - 0.2 0.08 0.10 Semicossyphus pulcher 0.2 - - - 0.06 0.12 Myliobatis ca/ifornica - <0.1 - - 0.02 0.04 Oxyju/is californica - <0.1 - - 0.02 0.04 Paralabrax c/athratus Uuv.) <0.1 - - - 0.02 0.04 Sebastes chrysomelas!S. carnalus (yoy) - <0.1 - - 0.02 0.04 Sebastes serranoides <0.1 - - - 0.02 0.04 Benthic Rhinogobiops nicholsii 4.3 2.9 4.2 5.8 4.29 1.16 Paralabrax c/athratus 5.2 2.9 2.5 5.8 4.10 1.64 Oxylebius pie/us 2.8 1.5 2.6 6.8 3.42 2.30 Hermosilla azurea 10.2 <0.1 - - 2.56 5.07 Hypsypops rubicundus 2.5 1.7 1.3 3.1 2.15 0.79 Gibbonsia spp. - 0.9 1.0 1.0 0.73 0.49 Sebas/es chrysome/as 0.9 0.8 0.2 0.9 0.73 0.32 Embiotoca jacksoni 0.5 0.4 1.0 0.8 0.67 0.26 Chromis punclipinnis 0.4 0.5 1.2 0.2 0.56 0.43 Semicossyphus pulcher 1.5 0.4 0.2 - 0.54 0.66 Paralabrax c/athratus Uuv.) 1.3 0.2 <0.1 - 0.40 0.63 Gire/la nigricans 10 <0.1 <0.1 0.2 0.33 0.45 Oxylebius pie/us Uuv.) - - - 1.1 0.27 0.54 Paralabrax c/athratus - 0.9 - - 0.23 0.46 Neoclinus stephensae 0.2 - 0.3 0.3 0.23 0.16 Gibbonsia spp. Uuv.) - - 0.2 0.6 0.21 0.28 Scorpaenich/hys marmoratus <0.1 0.2 0.2 0.2 0.17 0.07 Artedius spp. <0.1 - 0.2 0.2 0.1 2 0.11 Rhinogobiops nicholsii Uuv.) - - 0.2 0.3 0.12 0.16 Medialuna californiensis 0.3 - - - 0.08 0.17 Sebastes chrysome/as Uuv.) 0.3 - - - 0.08 0.17 Sebastes chrysomelas/S. camatus (yoy) - 0.3 - - 0.08 0.17 Urobatis hal/eri <0.1 <0.1 0.2 - 0.08 0.07 Embiotoca lateralis 0.2 - - - 0.04 0.08 Embiotoca /a/era/is Uuv.) <0.1 - <0.1 - 0.04 0.05 Ophiodon elongatus - - <0.1 <0. 1 0.04 0.05 Oxyjulis californica 0.2 - - - 0.04 0.08 Paralichthvs californicus - 0.2 - - 0.04 0.08 (table contmued) t' ESLO2021-02 H-2

Appendix H - Subtidal Fishes Table H2 (continued). Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, Nprth Diablo Cove Stations (NDC FO-1 (5), NDC FO-2 (6), NDC FO-3 (7)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Benthic (continued)

Arledius spp. Uuv.) . - <0.1 - 0.02 0.04 Gobiesox maeandricus - - - <0. 1 0.02 0.04 O/igocottus/Clinocottus spp. - <0.1 - - 0.02 0.04 Rhacochilus vacca - - <0.1 - 0.02 0.04 Sebastes serranoides - - <0.1 - 0.02 0.04

p. ESLO2021-02 H-3

Appendix H - Subtidal Fishes Table H3. Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, South Diablo Cove Stations (SDC FO-1 (8), SDC FO-2 (9), SDC FO-3 (10)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Midwater larval/post-larval fish - 60.8 49.6 - 27.60 32.20 Paralabrax c/athratus 1.4 0.9 0.3 0.5 0.79 0.48 Oxyju/is californica 2.4 0.2 - - 0.67 1.17 Chromis punctipinnis 0.2 0.7 - 1.0 0.48 0.44 Rhacochilus vacca 0.8 - - - 0.19 0.38 Embiotoca jacksoni - - - 0.2 0.04 0.08 Triakis semifasciata - 0.2 - - 0.04 0.08 Gire/la nigricans <0.1 - - - 0.02 0.04 Hermosilla azurea <0. 1 - - - 0.02 0.04 Paralabrax c/athratus Uuv.) <0.1 - - - 0.02 0.04 Sebastes chrysomelas!S. carnatus (yoy) <0.1 - - - 0.02 0.04 Semicossyphus pulcher <0.1 - - - 0.02 0.04 Benthic Rhinogobiops nicholsii 3.2 4.6 3.4 5.0 4.04 0.89 Chromis punctipinnis 0.3 0.5 - 5.9 1.69 2.83 Paralabrax clathratus 3.0 1.1 0.4 2.1 1.65 1.13 Oxylebius pictus 0.6 1.3 1.7 2.6 1.54 0.83 Oxyju/is californica 4.1 - 0.5 - 1.15 1.97 Gibbonsia spp. <0. 1 0.2 0.8 0.3 0.38 0.32 Sebas/es chrysomelas 0.5 0.6 0.2 0.2 0.35 0.22 Hermosilla azurea 1.3 - - - 0.33 0.67 Artedius spp. - 0.4 0.8 <0.1 0.31 0.34 Rhinogobiops nicho/sii Uuv.) - - 0.2 0.9 0.27 0.44 Rhacochilus vacca 0.9 - <0.1 - 0.25 0.45 Neoclinus stephensae 0.2 0.3 0.3 - 0.21 0.16 Triakis semifasciata 0.7 <0. 1 <0. 1 - 0.21 0.31 Urobatis halleri 0.3 - - 0.2 0.12 0.16 Gibbonsia spp. Uuv.) - 0.2 0.2 - 0.10 0.12 Sebastes rastrelliger 0.2 <0.1 - 0.2 0.10 0.08 Artedius spp. Uuv.) - 0.2 - - 0.06 0.12 Gire/la nigricans 0.2 <0.1 - - 0.06 0.08 Orthonopias triacis - - 0.2 - 0.06 0.12 Citharichthys stigmaeus - <0.1 <0.1 - 0.04 0.05 Sebastes atrovirens <0.1 <0.1 - - 0.04 0.05 Sebas/es chrysomelas Uuv.) 0.2 - - - 0.04 0.08 Anarrhichthys ocella/us - - - <0. 1 0.02 0.04 Ci/harich/hys spp. <0. 1 - - - 0.02 0.04 Ci/harichthys spp. Uuv.) . - <0.1 - 0.02 0.04 Embiotoca jacksoni <0.1 - - - 0.02 0.04 Gobiesox maeandricus - - <0.1 - 0.02 0.04 Hypsurus caryi - - - <0.1 0.02 0.04 O/igocottus spp. Uuv.) - - <0.1 - 0.02 0.04 Scorpaenich/hys marmoratus - <0.1 - - 0.02 0.04 Sebas/es minialus /vov) - - <0.1 - 0.02 0.04 p, ESLO2021 -02 H-4

Appendix H - Subtidal Fishes Table H4. Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, Patton Cove Stations (SC FO-1 (12), SC FO-2 (13), SC FO-3 (14)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Midwater Aulorhynchus flavidus 5.3 . 1.0 0.3 1.67 2.48 larval/post-larval fish . 3.8 2.5 . 1.56 1.88 Rhacochi/us vacca 0.4 0.2 <0.1 0.2 0.21 0.14 Oxyju/is ca/ifomica <0.1 0.3 - 0.2 0.1 7 0.15 Sebastes chrysomelas/S. camatus (yoy) - 0.2 0.2 - 0.1 2 0.14 Sebastes mystinus Uuv.) <0.1 <0.1 <0.1 0.2 0.12 0.08 Embiotoca /a/era/is <0.1 <0.1 <0.1 <0.1 0.08 <0.01 Sebastes serranoides/S. flavidus (yoy) - 0.3 - - 0.08 0.17 Sebastes serranoides - - - 0.2 0.06 0.12 Sebastes atrovirens - 0.2 - - 0.04 0.08 Sebastes mystinus - - 0.2 - 0.04 0.08 Oxyjulis ca/ifomica Uuv.) - - <0.1 - 0.02 0.04 Rhacochi/us toxotes - - - <0.1 0.02 0.04 Rhacochi/us vacca Uuv.) - <0.1 - - 0.02 0.04 Scorpaenichthys marmoratus - <0.1 - - 0.02 0.04 Sebastes mystinus (yoy) - - - <0.1 0.02 0.04 Sebastes serranoides Uuv.) - - - <0.1 0.02 0.04 Benthic Oxylebius pie/us 4.2 3.3 4.9 8.5 5.25 2.26 Sebastes mystinus (yoy) 0.2 2.4 4.2 6.2 3.25 2.56 Sebastes chrysomelas 2.1 1.9 1.5 1.8 1.81 0.25 Rhinogobiops nicholsii 0.9 0.3 0.5 2.3 1.02 0.91 Gibbonsia spp. 0.8 0.7 0.6 1.6 0.92 0.46 Sebastes mystinus Uuv.) 0.5 - 0.4 2.2 0.77 0.96 Embiotoca /a/era/is 1.1 <0.1 0.2 0.8 0.54 0.49 Embiotoca jacksoni 0.8 0.2 0.3 0.7 0.50 0.25 Artedius spp. 0.5 0.2 0.6 0.6 0.48 0.1 6 Sebastes rastrelliger 0.8 0.5 0.4 - 0.44 0.34 Rhacochi/us vacca 0.9 <0.1 - 0.7 0.42 0.45 Oxylebius pie/us Uuv.) - - 0.2 1.4 0.40 0.69 Sebastes miniatus (yoy) 0.4 - 0.8 - 0.29 0.36 Orthonopias triacis 0.4 <0.1 0.2 0.4 0.27 0.17 Sebastes atrovirens 0.2 0.2 0.2 0.4 0.23 0.13 Sebastes serranoides/S. flavidus (yoy) - 0.3 0.2 0.4 0.23 0.18 Embiotoca la/era/is Uuv.) 0.2 0.2 - 0.4 0.21 0.17 Scorpaenichthys marmoratus 0.2 <0.1 0.2 0.2 0.21 0.08 Rhinogobiops nicho/sii Uuv.) - - 0.2 0.5 0.17 0.24 Sebastes chrysome/as Uuv.) 0.5 - <0.1 <0.1 0.17 0.23 Oxyju/is califomica 0.2 - - 0.4 0.15 0.20 Sebastes serranoides 0.2 0.2 0.2 - 0.15 0.10 Semicossyphus pulcher <0.1 0.2 <0.1 <0.1 0.12 0.08 Cebidichthys vio/aceus - - - 0.4 0.10 0.21 Embiotoca jacksoni Uuv.) - - 0.2 0.2 0.10 0.1 2 Ophiodon elongatus <0.1 - 0.2 <0.1 0.10 0.10 Rhacochilus toxotes 0.2 - 0.2 <0.1 0.10 0.08 Sebastes serranoides /iuv.l - - <0.1 0.3 0.10 0.16 (table continued) t' ESLO2021-02 H-5

Appendix H - Subtidal Fishes Table H4 (continued). Subtidal fishes 2020 survey means (abundance per 50 x 4 x 2 m transect), standard deviations and annual means, Patton Cove Stations (SC FO-1 (12), SC FO-2 (13), SC FO-3 (14)).

Survey 186 187 188 189 Survey Date 7-Apr-20 13-Jul-20 1-Sep-20 31-Oct-20 Annual Annual Taxon Mean Mean Mean Mean Mean Std. Dev.

Benthic (continued)

Gibbonsia spp. Uuv.) - - <0.1 0.2 0.06 0.08 Cepha/oscy/lium ventriosum 0.2 - - - 0.04 0.08 Cottidae 0.2 - - - 0.04 0.08 Hexagrammos decagrammus - <0.1 - <0.1 0.04 0.05 Hypsurus caryi Uuv.) - - 0.2 - 0.04 0.08 Raja binoculata 0.2 - - - 0.04 0.08 Au/orhynchus flavidus - <0.1 - - 0.02 0.04 Brachyistius frenatus - - - <0.1 0.02 0.04 Cottidae Uuv.) - - - <0.1 0.02 0.04 O/igocottus spp. Uuv.) - - <0.1 - 0.02 0.04 Oxyjulis californica Uuv.) <0.1 - - - 0.02 0.04 Sebastes carnatus - - - <0.1 0.02 0.04 Sebastes caurinus (yoy) <0.1 - - - 0.02 0.04 Sebastes chrysomelas/S. carnatus (yoy) - - - <0.1 0.02 0.04 Sebastes miniatus Uuv.) - - - <0.1 0.02 0.04 Sebastes mystinus - - - <0.1 0.02 0.04 Sebastes rastrelliger (yoy) - - <0.1 - 0.02 0.04 C' ESLO2021-02 H-6

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