Text

Annual Radiological Environmental Monitoring Report for 2018
	ML19109A017
Person / Time
Site:	Humboldt Bay
Issue date:	04/18/2019
From:	Sharp L; Pacific Gas & Electric Co
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
	HBL-19-010
	Download: ML19109A017 (50)
	v • d • e

Pacific Gas and Loren D. Sharp 4111 Broad Street Electric Company*, Senior Director Suite 120 Nuclear Decommissioning San Luis Obispo, CA 93401 Phone: 805.595.6481 Email: Loren.Sharp@pge.com April 18, 2019 PG&E Letter HBL-19-010 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-133 License No. DPR-7 Humboldt Bay Power Plant Unit 3 Annual Radiological Environmental Monitoring Report for 2018

Dear Commissioners and Staff:

Enclosed is the Humboldt Bay Power Plant Unit 3, "Annual Radiological Environmental Monitoring Report" for 2018. This report provides the information required by Section 4.1 of the SAFSTOR/Decommissioning Offsite Dose Calculation Manual (ODCM).

The report has three sections. Section A provides a summary description of the SAFSTOR Radiological Environmental Monitoring Program (REMP), including maps of sampling locations. Section A also provides the results of licensee laboratory participation in the lnterlaboratory Comparison Program.

Section B provides summaries, interpretations, and analyses of trends of the results of the REMP for the reporting period. The material provided is consistent with the objectives outlined in the ODCM, and in 10 CFR 50, Appendix I, Sections IV.B.2, IV.B.3, and IV.C. Section B also includes a comparison with the baseline environmental conditions at the beginning of SAFSTOR.

Section C provides monitoring results for the reporting period. Radiological environmental samples and environmental radiation measurements were taken at the locations identified in ODCM Table 2-7 as quality-related locations. The summarized results are formatted for applicable reporting requirements of Generic Letter 79-65, "Radiological Environmental Monitoring Program Requirements -

Enclosing Branch Technical Position," Revision 1, dated November 27, 1979.

There are no new or revised regulatory commitments (as defined in NEI 99-04) made in this letter.

Document Control Desk PG&E Letter HBL-19-010 April 18, 2019 Page 2 If you have any questions regarding information in the enclosed report, please contact Mr. Philippe Soenen at (805) 459-3701.

Sincerely, Loren Sharp Senior Director, Nuclear Decommissioni g Enclosure cc: HBPP Humboldt Distribution cc/enc: John B. Hickman, NRG Project Manager Scott A.Morris, NRG Region IV Administrator

Enclosure PG&E Letter HBL-19-010 HUMBOLDT BAY POWER PLANT UNIT 3 ANNUAL RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT JANUARY 1 THROUGH DECEMBER 31, 2018

TABLE OF CONTENTS A. RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ............................ 1

1. Program Description ............................................................................................ 1

2. Monitoring Requirements ..................................................................................... 2

a. Offsite Environmental Monitoring ................................................................... 2

b. Onsite Environmental Monitoring ................................................................... 3

c. Other Monitoring ............................................................................................. 4

3. Interlaboratory Comparison Program ................................................................... 4

4. NEI Groundwater Protection Initiative .................................................................. 5 B. TRENDS, BASELINE COMPARISONS AND INTERPRETATIONS ......................... 5

1. General Comments.............................................................................................. 5

2. Direct Radiation Pathway .................................................................................... 6

3. Airborne Pathway ................................................................................................ 7

4. Waterborne Pathway ........................................................................................... 7

a. Surface Water ................................................................................................ 7

b. Groundwater................................................................................................... 7

5. Ingestion Pathway ............................................................................................... 7

6. Terrestrial Pathway .............................................................................................. 8 C. MONITORING RESULTS ......................................................................................... 8

1. Annual Summary ................................................................................................. 8

2. Direct Radiation Pathway .................................................................................... 9

3. Airborne Pathway .............................................................................................. 10

4. Waterborne Pathway ......................................................................................... 12

a. Surface Water .............................................................................................. 12

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TABLE OF CONTENTS (Continued)

b. Groundwater.............................................................................. .12

5. Ingestion Pathway ............................................................................................. 12

6. Terrestrial Pathway ........................................................................................... .12

7. NEI Groundwater Protection Initiative Voluntary Reporting Results........12

8. Errata For Previous Years Reports ...................................13

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LIST OF TABLES Table Page A-1 HBPP RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ............ 14 A-2 DISTANCES AND DIRECTIONS TO HBPP OFFSITE SAMPLE LOCATIONS ... 14 A-3 GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM.

DATA..15 A-4 HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY .

CROSS-CHECK PROGRAM DATA ..................................................................... 19 C-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL REPORT

SUMMARY

........................................................................................... 25 C-2 ONSITE ENVIRONMENTAL TLD STATIONS ...................................................... 27 C-3 OFFSITE (Control) ENVIRONMENTAL TLD STATIONS ..................................... 28 C-4 ODCM REQUIRED AIR SAMPLES ...................................................................... 29 LIST OF FIGURES Figure Page A-1 HBPP ONSITE AIR SAMPLE LOCATIONS ......................................................... 37 A-2 HBPP OFFSITE AIR SAMPLE LOCATION .......................................................... 38 A-3 HBPP ONSITE TLD LOCATIONS ........................................................................ 39 A-4 HBPP OFFSITE TLD LOCATIONS ...................................................................... 40 B-1 OFFSITE ENVIRONMENTAL RADIATION LEVEL TRENDS .............................. 43 B-2 ONSITE ENVIRONMENTAL RADIATION LEVEL TRENDS ................................ 44

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PACIFIC GAS AND ELECTRIC COMPANY ANNUAL RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT FOR HUMBOLDT BAY POWER PLANT UNIT 3, COVERING THE PERIOD JANUARY 1 THROUGH DECEMBER 31, 2018 This annual report is required by Section 4.1 of the SAFSTOR/Decommissioning Offsite Dose Calculation Manual (ODCM). This report provides information about the Radiological Environmental Monitoring Program (REMP) for the period of January 1 through December 31, 2018, in a manner consistent with the objectives outlined in the ODCM, and in 10 CFR 50, Appendix I, Sections IV.B.2, IV.B.3, and IV.C.

The report has three sections. Section A provides a summary description of the REMP, including maps of sampling locations. Section A also provides the results of licensee laboratory participation in the Interlaboratory Comparison Program.

Section B provides summaries, interpretations, and analyses of trends of the results of the REMP for the reporting period. The material provided is consistent with the objectives outlined in the ODCM, and in 10 CFR 50, Appendix I, Sections IV.B.2, IV.B.3, and IV.C. Section B also includes a comparison with the baseline environmental conditions at the beginning of SAFSTOR.

Section C provides the results of analyses of radiological environmental samples and of environmental radiation measurements taken during the period pursuant to the quality related locations specified in the table and figures in the ODCM, presented as both summarized and tabulated results of these analyses and measurements. The summarized results are formatted for applicable reporting requirements of the NRC Radiological Assessment Branchs Branch Technical Position.

A. RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

1. Program Description The NRC Radiological Assessment Branch issued a Branch Technical Position (BTP) on environmental monitoring in March 1978. Revision 1 of the BTP was issued as Generic Letter 79-65, Radiological Environmental Monitoring Program Requirements - Enclosing Branch Technical Position, Revision 1, dated November 27, 1979, and sets forth an example of an acceptable minimum radiological monitoring program. The specified environmental monitoring program provides measurements of radiation and of radioactive materials in those exposure pathways and for those radionuclides that lead to the highest potential radiation exposures of individuals resulting from plant effluents.

As discussed below, many of the exposure pathway sample requirements specified in the BTP are not required for the HBPP REMP because of the baseline conditions established in the SAFSTOR Decommissioning Plan (now identified as the Post Shutdown Decommissioning Activities Report (PSDAR) and Defueled Safety Analysis Report (DSAR)) and the Environmental Report.

In addition, the nuclides specified for analysis by the BTP have been revised to reflect the available source term at a nuclear power plant that has been shut down since July 2, 1976.

The REMP consists of the collection and analysis of both onsite and offsite environmental samples. HBPP personnel perform sample collection and sample analysis of airborne radioactivity. General Engineering Laboratories (GEL) personnel no longer perform effluent sample analyses as ground water radioactivity monitoring was discontinued in 2017. Mirion Technologies personnel perform analysis of thermoluminescent dosimeters (TLDs) used for monitoring direct radiation. A summary of the REMP is provided as Table A-1, HBPP RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM.

Sample collection for the REMP is performed at the sampling stations defined by Table A-2, DISTANCES AND DIRECTIONS TO HBPP OFFSITE SAMPLE LOCATIONS, Figure A-1, HBPP ONSITE AIR SAMPLE LOCATIONS; Figure A-2, HBPP OFFSITE AIR SAMPLE LOCATION; Figure A-3, HBPP ONSITE TLD LOCATIONS, and Figure A-4 HBPP OFFSITE TLD LOCATIONS.

2. Monitoring Requirements

a. Offsite Environmental Monitoring

1. Airborne The ODCM requires one (1) offsite environmental air sampling station.

The air sampler is run continuously, and samples are analyzed weekly for Gross Beta and Gross Alpha activity. Station 3 satisfies this requirement as shown on Figure A-2. Quarterly the composited samples are analyzed for Gamma Isotopic.

2. Direct Radiation The ODCM requires four (4) offsite environmental monitoring stations and one (1) offsite control station equipped with TLDs to monitor gamma exposure. The TLDs are required to be exchanged quarterly. Offsite environmental stations selected to satisfy this requirement are Stations 1, 2, 14, and 25 while T17 is the offsite control station as shown on Figure A-4. These stations are considered to represent the offsite locations for the direct radiation pathway.

3. Ingestion The requirement to perform milk sampling was removed from the ODCM Revision 24 based upon no detection of Sr-90 or plant-related gamma emitters in milk since decommissioning began.

b. Onsite Environmental Monitoring

1. Airborne The ODCM requires four (4) onsite air sampling stations. The stations selected to satisfy this requirement are Stations AM1 through AM4 as shown on Figure A-1. The air samplers are run continuously, and samples are analyzed weekly for Gross Beta and Gross Alpha activity.

Quarterly the composited samples are analyzed for Gamma Isotopic, by station. The number of onsite air sampling stations was reduced from five (5) to four (4) during 2018. Also, continuously is currently defined to be during onsite work activities. These adjustments to the environmental monitoring program during 2018 were made to accommodate the progress of decommissioning, the elimination of any effluent pathway other than active work evolutions and difficulty in maintaining power supplies during nonactive work hours to remote areas of the site. The four remaining air sampling locations generally represent the four major compass sectors (N, S, E, W) and areas that are potentially approachable by a member of the public.

2. Direct Radiation The ODCM requires a minimum of 8 onsite environmental monitoring stations at or within the site boundary fence line, equipped with TLDs to monitor gamma exposure. TLDs are required to be exchanged quarterly.

A total of 16 TLD stations are currently used to satisfy this requirement.

Stations T1 through T16 are shown on Figure A-3.

Each quarter the exposures from 16 stations are determined, which normally results in 64 analyses for a full year. However, T-10 was lost in the 2nd quarter 2018, resulting in 63 analyses for 2018. Each TLD station has three TLDs, each containing a number of phosphors (normally three).

The phosphor exposures for each TLD are averaged and then the three TLDs per station are averaged to provide the quarterly exposure for the station.

The minimum number of TLDs was modified in the ODCM from 16 to 8 stations to allow monitoring locations to be reduced as source term is removed from the site during the final phase of decommissioning. After discovering monitoring location T10 had been lost during decommissioning activities, the TLD was replaced and monitoring continued through the remainder of the year (SAPN 1443647). In December 2018, monitoring locations T9 and T10 were relocated to better represent the northeast and east north east perimeter of the site fence.

3. Waterborne Surface Water Effective December 31, 2013, discharge of processed radioactive liquid effluents to Humboldt Bay was terminated. Any remaining or incidental radioactive liquids in concentrations exceeding 10 times 10 CFR 20, Appendix B, Table 2 Column 2 are manifested for disposal at a regulated disposal facility. Sampling of surface water is not required by the current revision of the ODCM.

Groundwater Revision 23 of the ODCM transferred ground water monitoring program requirements from the ODCM to HBPPs ground water monitoring program procedures. This was done to allow operational flexibility needed to adjust to changes to site access and hydrogeology as soils and building substructures are removed. After May 2017, formal closure of the ground water monitoring program was initiated. There were no well locations sampled in 2018.

c. Other Monitoring Offsite airborne, ingestion and terrestrial pathway monitoring is not required by the ODCM. The Environmental Report, submitted to the NRC as Attachment 6 to SAFSTOR License Amendment Request 84-01, dated July 31, 1984, established baseline conditions for these pathways. In accordance with the NRC-approved SAFSTOR Decommissioning Plan, (now identified as the PSDAR and DSAR), these baseline conditions will only need to be reestablished prior to final decommissioning if a significant release occurs during SAFSTOR. The Environmental Report also contains a description of the demography and human activities within the environs surrounding the site.

3. Interlaboratory Comparison Program PG&Es contract laboratory, GEL, has analyzed evaluation samples provided by a commercial supplier to satisfy the requirement to participate in an Interlaboratory Cross-Check Program. Results are provided in Table A-3, GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM DATA.

With the termination of the ground water monitoring program in 2017, GEL no longer provides analyses of REMP samples for HBPP.

GELs Third-Party Cross-Check Program provides environmental matrices representative of past HBPP analyses and is intended to meet or exceed the interlaboratory comparison program requirements of NRC Regulatory Guide 4.15. GEL analyzed ninety-two (92) Eckert & Ziegler individual environmental sample analyses. All results met GELs acceptance criteria (100% within acceptance).

HBPP count room personnel also participated in the Eckert & Ziegler Interlaboratory Cross-Check Program. This participation includes sufficient determinations (sample medium and radionuclide combination) to ensure independent checks on the precision and accuracy of the measurements of radioactive materials in REMP samples. Table A-4, HBPP PARTICIPATION -

ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA, represent analyses performed by HBPP personnel (Table A-4). The agreement criteria are consistent with the guidance for Confirmatory Measurements as described in NRC Inspection Procedure 83502.03, Radiological Environment Monitoring Program and Radioactive Material Control Program.

HBPP analyzed four sets of Eckert & Ziegler Analytics samples for gamma in soil, (1st and 4th quarters), gamma air filter and alpha/beta air filter (2nd quarter),

and gamma in water and tritium in water (3rd quarter). These analyses are representative of those performed by HBPP count room personnel during 2018.

All results met the acceptance criteria.

4. NEI Groundwater Protection Initiative Based on the state of decommissioning at HBPP, there remains little potential for ground water to become contaminated during the final stages of decommissioning. Formal closure of the ground water monitoring wells was initiated in 2017 and continued into 2018. Ground water monitoring wells were closed in accordance with local water authority guidance and permits under Work Package 99-28, Well Abandonment. Sampling of ground water monitoring wells was discontinued after the second quarter of 2017.

B. TRENDS, BASELINE COMPARISONS AND INTERPRETATIONS Section B provides interpretations of results, and analyses of trends of the results. The material provided is consistent with the objectives outlined in the ODCM, and in 10 CFR 50, Appendix I, Sections IV.B.2, IV.B.3, and IV.C.

Section B also includes a comparison with the baseline environmental conditions at the beginning of SAFSTOR.

1. General Comments The Environmental Report, submitted to the NRC as Attachment 6 to SAFSTOR License Amendment Request 84-01, established baseline conditions for soil, biota and sediments. The results to date indicate no change from the baseline environmental conditions established in the Environmental Report.

The results, interpretations, and analysis of trends of the results, indicate that SAFSTOR activities have had no measurable radiological effect on the environment. Facility surveys for radiation and radioactive surface contamination are performed on both a scheduled basis and on an as-required basis. These surveys indicate that the radioactivity control barriers established for SAFSTOR and decommissioning continue to be effective.

As discussed below, the ODCM calculation model conservatively assumes that exposure pathways begin at the unrestricted area boundary, also known as the owner controlled area (OCA) boundary. Since there have been no changes in the location of the unrestricted area boundary, no survey for changes to the use of unrestricted areas was necessary.

2. Direct Radiation Pathway A plot of the radiation level trends for the five (offsite) locations is shown in Figure B-1, OFFSITE ENVIRONMENTAL RADIATION LEVEL TRENDS. A plot of the radiation level trends for onsite stations is shown in Figure B-2, ONSITE ENVIRONMENTAL RADIATION LEVEL TRENDS. The plots show that the offsite annual doses continue to be within the ranges that have been observed over the last ten years.

HBPP changed TLD processing services beginning in January 2014. Data from previous years was based on a Panasonic TLD system. Data in 2014 to the present is based on Mirion Genesis type TLD system. The apparent rise in Figures B-1 and B-2 after 2014 may be a result of the change in monitoring devices in tandem with the increase in decommissioning activities.

Figure B-2 includes the average dose for two groups of onsite stations, selected by their potential to be affected by radioactive waste handling activities. Figure B-2 also shows that dose measurement variations can be attributed to in-plant sources and low-level waste packaging and shipping activities. However, allowing for the background change in the general environs, all measurements were comparable to the ranges observed at these locations since entering SAFSTOR, with the onsite station dose levels approximately within the range of dose levels shown by the offsite stations.

The ODCM calculation model for the direct radiation exposure pathway in past years assumed an occupancy factor for the portion of the unrestricted area boundary that was closest to the radioactive waste handling area of the plant.

During 2018, maximum yearly dose, was seen on TLD T9, corrected to the 67-hour occupancy, and subtracting the average of the five (5) offsite TLDs, the dose to the maximum exposed individual from this source was approximately 0.1 mrem above background.

The Humboldt Bay ISFSI is licensed under 10 CFR 72, but is contained within the licensed boundary of the HBPP site, so no other dose contributions to the public are considered. The HBPP site had no measurable liquid or gaseous radioactive effluents that would challenge the limitations of 40 CFR 190. The direct dose is the only contributor to public dose and is within the 25 millirem limit to the whole body.

3. Airborne Pathway Dose assessment based on offsite airborne pathway monitoring is not required by the ODCM. The Environmental Report, submitted to the NRC as Attachment 6 to SAFSTOR License Amendment Request 84-01, established baseline conditions for the airborne pathway. In accordance with the NRC-approved SAFSTOR Decommissioning Plan, (now identified as the PSDAR and DSAR), these baseline conditions will only need to be reestablished prior to final decommissioning if a significant release occurs during SAFSTOR. The ODCM calculation model for the airborne pathway assumes that the airborne exposure pathway (inhalation exposure) is at the unrestricted area boundary, which is the location of the highest potential exposure.

4. Waterborne Pathway

a. Surface Water Liquid radioactive wastes are shipped for disposal to a regulated disposal facility. Discharges of liquid radioactive effluent to Humboldt Bay were eliminated after December 2013.

b. Groundwater Groundwater sampling of the waterborne pathway ceased in the second quarter of 2017. There were no spills challenging the groundwater in 2018.

The ODCM does not provide a model for the groundwater waterborne pathway, because the groundwater is saline and is not used now nor likely to be used in the future for either direct consumption or for agricultural purposes.

5. Ingestion Pathway Ingestion pathway monitoring is not required by the ODCM. The Environmental Report, submitted to the NRC as Attachment 6 to SAFSTOR License Amendment Request 84-01, established baseline conditions for the ingestion pathway. In accordance with the NRC-approved SAFSTOR Decommissioning Plan, (now identified as the PSDAR and DSAR), these baseline conditions will only need to be reestablished prior to final decommissioning if a significant release occurs during SAFSTOR.

The ODCM calculation model for the airborne pathway assumes that the ingestion pathways (milk, meat and vegetable consumption) begin at the unrestricted area boundary, which is the location of the highest potential exposure, whether any dairy, farm, etc. is actually present.

6. Terrestrial Pathway Terrestrial pathway monitoring is not required by the ODCM. The Environmental Report, submitted to the NRC as Attachment 6 to SAFSTOR License Amendment Request 84-01, established baseline conditions for the terrestrial pathway. In accordance with the NRC-approved SAFSTOR Decommissioning Plan, (now identified as the PSDAR and DSAR), these baseline conditions will only need to be reestablished prior to final decommissioning if a significant release occurs during SAFSTOR.

The ODCM calculation model for the terrestrial pathway conservatively assumes that the terrestrial exposure (direct radiation from airborne radioactivity deposition) is at the unrestricted area boundary, which is the location of the highest potential exposure.

C. MONITORING RESULTS

1. Annual Summary Results of the REMP sampling and analysis are summarized in Table C-1 in the format of the BTP Table 3.

All the minimum detectable activities (MDAs) for analyses required by the REMP were less than or equal to the lower limit of detection (LLD) criteria for radioactivity in environmental samples specified in Table C-1 of this report.

Because alpha and beta radioactivity analyses of the saline ground water are less effective than tritium and gamma radioactivity analyses, the ODCM does not currently require alpha and beta radioactivity analyses in water to be part of the REMP. However, HBPP maintains gamma and tritium in water analysis capability as a prerequisite to evaluate ground water/storm water radioactivity for GWTS (Ground Water Treatment System), independent of the REMP program.

2. Direct Radiation Pathway Monitoring of the direct radiation pathway is performed at 16 onsite locations near the OCA fence line, and at four offsite environmental monitoring stations and one offsite (control) location (Location number T17) near the facility.

Monitoring is performed with TLDs with multiple crystal elements. Three TLDs are installed at each station, and the TLD sets are exchanged quarterly. The reported result and its standard error are calculated from the measurements of multiple elements in the TLD triplet. Results of the onsite and offsite monitoring are provided in Tables C-2 and C-3, respectively.

TLD T16 was relocated on February 26, 2018, due to installation of a new north fence line boundary adjacent to the switchyard. T16 was relocated to the permanent HBGS switchyard fence northeast of the Intake Canal on April 4, 2018, to represent the southwest sector of HBPP. The move was documented in SAPN 1438430.

Corrective action SAPN 1439150 documented the increase in dose rate on TLD T9 at the site fence line early in 2017. In 2018, the waste management area at the east end of the site was disassembled. However, the elevated TLD result at T9 location persisted. Upon further investigation, it was determined that a granite boulder near the T9 TLD location exhibited dose rates of 8 uR/hr general area and 13 uR/hr on contact. Therefore, the dose assessment based on the perimeter TLD results was accurate, but the dose was not attributable to licensed material or dominated by the waste operations in the area, as previously believed. SAPN 1441849 documents the as found condition.

During the second quarter TLD exchange, TLD T10 was discovered to be missing - the post, housing and TLD had been removed. TLD T10s location had previously been in the Trailer City excavation near the bay front Coastal Trail. Attempts to recover the missing TLD were unsuccessful. A replacement TLD for monitoring third quarter dose was installed on the coastal fence on June 29, 2018, near the previous location of TLD T10. Actions were documented in SAPN 1443647.

TLD T11 was relocated on July 10, 2018, to the HBGS fence adjacent to the East Fence air sampler (AM1). The TLD was moved due to decommissioning activities within the immediate vicinity of the former location. Actions were documented in SAPN 1438430.

TLD 11 was relocated on August 22, 2018, from the gate adjacent to HBGS to the doghouse of the East Fence air sampler (AM1). Because the HBGS fence may be relocated or replaced, the TLD box was attached to the REMP air sampler doghouse to prevent the environmental TLD from disappearing.

Actions were documented in SAPN 1438430.

Due to the removal and replacement of several temporary onsite fences, TLD 2 was transferred from the west perimeter fence to the gas cage at the rear of the Count Room building on September 26, 2018. Actions were documented in SAPN 1446341.

At the end of the fourth quarter of 2018, environmental TLDs T9 and T10 were relocated due to changes in perimeter fencing within the respective areas. The TLDs were transferred to new locations and GPS coordinates were obtained.

This was documented in corrective action SAPN 1446341.

3. Airborne Pathway Four onsite samples and one offsite sample were collected and analyzed weekly for Gross Beta and Gross Alpha activity.

The required quarterly composited samples were analyzed for Gamma Isotopic by station. All air sample results for alpha and beta activity and quarterly composite results for Co-60 and Cs-137 are provided in Table C-4. The weekly sample results for alpha and beta particulate met the effluent acceptance criteria in the ODCM. All LLDs were met for Gross Beta (required LLD 1.0E-02 pCi/m3).

Interruptions of continuous REMP air sampler operations occurred on the following dates due to ongoing decommissioning activities:

Date SAPN Description 01/04/2018 1438309 The AM2 air sampler formerly adjacent to Building 12 was found to be not operating due to a tripped GFCI. The air sampler had run for approximately 47 hours5.439815e-4 days 0.0131 hours 7.771164e-5 weeks 1.78835e-5 months . Longer analysis count times were performed to meet the required MDAs.

01/13/2018 1438739 The AM3 air sampler adjacent to the Annex was turned off for 2.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months due to a planned power outage for electrical maintenance activities.

02/20/2018 1438430 The East Fence air sampler (AM1) was powered down for 10 minutes to allow relocation of the light plant that supplies power to the air sample pump.

02/26/2018 1438430 The East Fence air sampler (AM1) was powered off for approximately 20 minutes due to electrical maintenance activities.

04/03/2018 1441219 The East Fence air sampler (AM1) was reported as not operating on 4/3/2018. The sample pump was changed out on 4/4/2018, and the totalizer reading was used to determine sample volume. During the time the sample pump was not running, there were no field activities that could have caused an airborne event.

04/09/2018 1441521 The GWTS air sampler (AM2) was discovered to be out of service due to a tripped breaker.

04/12/2018 1438430 AM2 was relocated to a corner of the GWTS 2.0 area, primarily due to electrical power supply issues.

The down time for the filter was adequately documented.

04/25/2018 1438430 The East Fence air sampler (AM1) was shut down to relocate the generator which powers the sampler.

04/26/2018 1441799 The East Fence air sampler (AM1) was found to be not operating due to a tripped GFCI. The sampler was later shut down for approximately 10 minutes to switch generators.

05/07/2018 1442270 The East Fence air sampler (AM1) was found to be not operating. The sampler was restarted, and totalizer readings were used to determine sample volume.

05/18/2018 1442601 The East Fence air sampler (AM1) was found to be not running, most likely due to the generator tripping off line.

Date SAPN Description 06/04/2018 1443150 The East Fence air sampler (AM1) was found to be not running.

06/07/2018 1438430 The East Fence air sampler (AM1) was relocated to the HBGS fence line. An extension cord from HBGS was used to power the sample pump. The air sampler was turned off during the relocation.

06/27/2018 1438430 The O.W.S air sampler (AM5) located at the former location of the oily water separator was permanently turned off. The location was deleted from the ODCM and the air sampler was noted to no longer be required.

07/03/2018 1444106 HBGS initiated a clearance on the power source for the East Fence air sampler (AM1) which lasted for several days. The decision was made not to attempt to power the air sampler by generator from 7/3/2018 to 7/10/2018. Because no work was planned during the time interval (site was shut down for the holiday week), the air sampler was not required to be run during nonbusiness hours.

07/23/2018 1444412 Due to a site wide electrical outage of approximately 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and problems encountered following the power outage, the Annex air sampler (AM3) and GWTS air sampler (AM2) could not immediately be returned to service. AM3 was returned to service on 7/24/2018 while AM2 was returned to service on 7/26/2018.

07/31/2018 1444804 The Annex air sampler (AM3) was found to be unplugged with a totalizer run time of approximately 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months and 55 minutes. It appeared a worker may have tripped over the electrical extension cord, causing it to become unplugged. The sampler was restarted and the totalizer reading used to determine the sample volume.

08/07/2018 1438430 The Annex air sampler (AM3) was without power for approximately 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months on 8/7/2018 due to a planned electrical outage. The GWTS 2.0 air sampler (AM2) was without power for approximately 30 minutes on 8/8/2018 due to a planned electrical outage.

12/11/2018 1438430 The Annex air sampler (AM3) lost power sometime around 12/11/2018.

4. Waterborne Pathway

a. Surface Water Surface water sampling of the waterborne pathway is no longer performed due to the termination of liquid effluent releases in December 2013.

b. Groundwater Groundwater sampling of the waterborne pathway ceased in the second quarter of 2017.

5. Ingestion Pathway Ingestion pathway monitoring is not required by the ODCM.

6. Terrestrial Pathway Terrestrial pathway monitoring is not required by the ODCM.

7. NEI Groundwater Protection Initiative Voluntary Reporting Results The NEI Groundwater Protection Initiative contains the following requirements:

OBJECTIVE 2.2 VOLUNTARY COMMUNICATION Make informal notification as soon as practicable to appropriate State/Local officials, with follow up notification to the NRC, as appropriate, regarding significant onsite leaks/spills into groundwater and onsite or offsite water sample results exceeding the criteria in the REMP as described in the ODCM/ODAM.

HBPP Response to 2.2:

There were no reports or notifications required to be generated in 2018 for groundwater results exceeding reporting/notification levels or significant onsite leaks/spills.

OBJECTIVE 2.3 THIRTY-DAY REPORTS Submit a 30-day report to the NRC for any water sample result for onsite groundwater that is or may be used as a source of drinking water that exceeds the criteria in the licensee's existing REMP for 30-day reporting of offsite water sample results. Copies of 30-day reports for both onsite and offsite water samples will also be provided to the appropriate State agency, and:

HBPP Response to 2.3:

There were no reports or notifications required to be generated in 2018 for groundwater results exceeding reporting/notification levels or significant onsite leaks/spills.

OBJECTIVE 2.4 ANNUAL REPORTING Document all on-site ground water sample results and a description of any significant on-site leaks/spills into groundwater for each calendar year in the AREOR for REMP or the ARERR for the RETS as contained in the appropriate reporting procedure, beginning with Calendar year 2006.

HBPP Response to 2.4:

Groundwater sampling of the waterborne pathway ceased in the second quarter of 2017.

There were no significant onsite leaks/spills into groundwater in 2018.

Note: The term significant is defined by the NEI Initiative as greater than 100 gallons.

8. Errata for Previous Years Reports A small dose was reported for calendar year 2017 based on what was believed to be from area waste operations on the east end of the site. It was determined in 2018 to be attributable to natural sources, specifically granite boulders, associated with the restoration of the coastal trail. See section C.2 above.

TABLE A-1 HBPP RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM Exposure Pathway Number of Samples Sampling and Collection Type of Analysis And/Or Sample And Locations (a) Frequency AIRBORNE 4 onsite locations, Continuous sampler operation Gross alpha and 1 offsite location with sample collection at least Gross beta once per 7 days radioactivity following filter change. Gamma Isotopic(b) analysis on quarterly composite (by station).

DIRECT RADIATION 8 onsite stations with TLDs TLDs exchanged quarterly Gamma exposure 5 offsite stations with TLDs TLDs exchanged quarterly Gamma exposure WATERBORNE Groundwater No longer required N/A N/A.

(a)

The number of onsite sample / monitoring locations was scaled back in February 2018 (ODCM Revision 28) based on decommissioning status, the closure of ground water wells, and completion of remediation activities.

(b)

Gamma isotopic analysis means the identification and quantification of gamma emitting radionuclides that may be attributable to the effluents from the facility.

TABLE A-2 DISTANCES AND DIRECTIONS TO HBPP OFFSITE SAMPLE LOCATIONS Radial Direction Offsite Radial Distance Station Measurement By From Plant Number Pathway Station Name Sector Degrees (Miles) 3 Airborne Humboldt Hill SSE 158 0.9 King Salmon 1 Direct Radiation Picnic Area W 270 0.3 2 Direct Radiation City of Fortuna SSE 158 9.4 Water Pollution Control Plant, 180 Dinsmore Drive, Fortuna 14 Direct Radiation South Bay School S 180 0.4 Parking Lot 25 Direct Radiation Irving Drive, SSE 175 1.3 Humboldt Hill T17 Direct Radiation Mitchell Heights NNE 61 5.8 Drive TABLE A-3 GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi/L) (pCi/L)

Gamma Water I-131 E12103 1st 5/11/2018 9.37E+01 9.10E+01 1.03 Acceptable Ce-141 E12103 1st 5/11/2018 7.86E+01 7.34E+01 1.07 Acceptable Cr-51 E12103 1st 5/11/2018 3.44E+02 3.10E+02 1.11 Acceptable Cs-134 E12103 1st 5/11/2018 1.61E+02 1.71E+02 0.94 Acceptable Cs-137 E12103 1st 5/11/2018 1.64E+02 1.64E+02 1.00 Acceptable Co-58 E12103 1st 5/11/2018 1.92E+02 1.78E+02 1.08 Acceptable Mn-54 E12103 1st 5/11/2018 1.36E+02 1.25E+02 1.09 Acceptable Fe-59 E12103 1st 5/11/2018 1.48E+02 1.32E+02 1.12 Acceptable Zn-65 E12103 1st 5/11/2018 2.53E+02 2.33E+02 1.09 Acceptable Co-60 E12103 1st 5/11/2018 1.92E+02 1.78E+02 1.08 Acceptable Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi/L) (pCi/L)

Milk Sr-89 E12101 1st 5/11/2018 9.16E+01 9.01E+01 1.02 Acceptable Sr-90 E12101 1st 5/11/2018 8.00E+01 1.25E+02 0.64 Acceptable I-131 E12102 1st 5/11/2018 1.05E+02 1.08E+02 0.97 Acceptable Ce-141 E12102 1st 5/11/2018 7.23E+01 7.70E+01 0.94 Acceptable Co-58 E12102 1st 5/11/2018 1.11E+02 1.14E+02 0.97 Acceptable Co-60 E12102 1st 5/11/2018 1.90E+02 1.87E+02 1.02 Acceptable Cr-51 E12102 1st 5/11/2018 3.00E+02 3.26E+02 0.92 Acceptable Cs-134 E12102 1st 5/11/2018 1.58E+02 1.80E+02 0.88 Acceptable Cs-137 E12102 1st 5/11/2018 1.75E+02 1.72E+02 1.02 Acceptable Mn-54 E12102 1st 5/11/2018 1.36E+02 1.31E+02 1.04 Acceptable Fe-59 E12102 1st 5/11/2018 1.52E+02 1.39E+02 1.10 Acceptable Zn-65 E12102 1st 5/11/2018 2.73E+02 2.44E+02 1.12 Acceptable Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi) (pCi)

Cartridge I-131 E12100 1st 5/11/2018 9.20E+01 8.52E+01 0.97 Acceptable TABLE A-3 (Continued)

GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi/L) (pCi/L)

Gamma Water I-131 E12174 2nd 7/7/2018 7.31E+01 7.44E+01 0.98 Acceptable Ce-141 E12174 2nd 7/7/2018 1.02E+02 8.58E+01 1.19 Acceptable Cr-51 E12174 2nd 7/7/2018 2.73E+02 2.49E+02 1.10 Acceptable Cs-134 E12174 2nd 7/7/2018 1.06E+02 1.19E+02 0.89 Acceptable Cs-137 E12174 2nd 7/7/2018 9.86E+01 1.03E+02 0.96 Acceptable Co-58 E12174 2nd 7/7/2018 9.76E+01 9.29E+01 1.05 Acceptable Mn-54 E12174 2nd 7/7/2018 1.47E+02 1.35E+02 1.09 Acceptable Fe-59 E12174 2nd 7/7/2018 1.08E+02 8.97E+01 1.20 Acceptable Zn-65 E12174 2nd 7/7/2018 1.97E+02 1.64E+02 1.20 Acceptable Co-60 E12174 2nd 7/7/2018 1.22E+02 1.18E+02 1.03 Acceptable Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi/L) (pCi/L)

Milk Sr-89 E12172 2nd 7/7/2018 9.58E+01 8.46E+01 1.13 Acceptable Sr-90 E12172 2nd 7/7/2018 8.47E+00 1.14E+01 0.74 Acceptable I-131 E12173 2nd 7/7/2018 7.89E+01 7.19E+01 1.10 Acceptable Ce-141 E12173 2nd 7/7/2018 9.01E+01 8.22E+01 1.10 Acceptable Co-58 E12173 2nd 7/7/2018 9.26E+01 8.90E+01 1.04 Acceptable Co-60 E12173 2nd 7/7/2018 1.18E+02 1.13E+02 1.04 Acceptable Cr-51 E12173 2nd 7/7/2018 2.58E+02 2.39E+02 1.08 Acceptable Cs-134 E12173 2nd 7/7/2018 1.10E+02 1.14E+02 0.97 Acceptable Cs-137 E12173 2nd 7/7/2018 1.04E+02 9.88E+01 1.05 Acceptable Mn-54 E12173 2nd 7/7/2018 1.42E+02 1.30E+02 1.09 Acceptable Fe-59 E12173 2nd 7/7/2018 8.87E+01 8.60E+01 1.03 Acceptable Zn-65 E12173 2nd 7/7/2018 1.83E+02 1.57E+02 1.16 Acceptable Sample/ Radionuclide Sample Quarter Report GEL Reference Ratio Evaluation Analysis Number 2018 Date Value Value (pCi) (pCi)

Cartridge I-131 E12171 2nd 7/7/2018 7.22E+01 7.16E+01 1.01 Acceptable TABLE A-3 (Continued)

GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi/L) (pCi/L)

Gamma Water I-131 E12243 3rd 11/12/2018 6.76E+01 6.25E+01 1.08 Acceptable Ce-141 E12243 3rd 11/12/2018 1.48E+02 1.33E+02 1.11 Acceptable Cr-51 E12243 3rd 11/12/2018 2.92E+02 2.75E+02 1.06 Acceptable Cs-134 E12243 3rd 11/12/2018 1.20E+02 1.28E+02 0.94 Acceptable Cs-137 E12243 3rd 11/12/2018 1.64E+02 1.54E+02 1.07 Acceptable Co-58 E12243 3rd 11/12/2018 1.53E+02 1.50E+02 1.02 Acceptable Mn-54 E12243 3rd 11/12/2018 1.91E+02 1.74E+02 1.10 Acceptable Fe-59 E12243 3rd 11/12/2018 1.39E+02 1.24E+02 1.12 Acceptable Zn-65 E12243 3rd 11/12/2018 2.41E+02 2.09E+02 1.15 Acceptable Co-60 E12243 3rd 11/12/2018 2.09E+02 1.98E+02 1.06 Acceptable Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi/L) (pCi/L)

Milk Sr-89 E12241 3rd 11/12/2018 8.57E+01 8.17E+01 1.05 Acceptable Sr-90 E12241 3rd 11/12/2018 9.22E+00 1.48E+01 0.62 Acceptable I-131 E12242 3rd 11/12/2018 7.18E+01 5.82E+01 1.23 Acceptable Ce-141 E12242 3rd 11/12/2018 1.43E+02 1.28E+02 1.12 Acceptable Cr-51 E12242 3rd 11/12/2018 2.54E+02 2.65E+02 0.96 Acceptable Cs-134 E12242 3rd 11/12/2018 1.18E+02 1.23E+02 0.96 Acceptable Cs-137 E12242 3rd 11/12/2018 1.53E+02 1.47E+02 1.04 Acceptable Co-58 E12242 3rd 11/12/2018 1.54E+02 1.44E+02 1.07 Acceptable Mn-54 E12242 3rd 11/12/2018 1.84E+02 1.67E+02 1.09 Acceptable Fe-59 E12242 3rd 11/12/2018 1.20E+02 1.19E+02 1.01 Acceptable Zn-65 E12242 3rd 11/12/2018 2.44E+02 2.01E+02 1.22 Acceptable Co-60 E12242 3rd 11/12/2018 2.02E+02 1.90E+02 1.06 Acceptable Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi) (pCi)

Cartridge I-131 E12240 3rd 11/12/2018 7.95E+01 8.03E+01 0.99 Acceptable TABLE A-3 (Continued)

GEL PARTICIPATION - INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi/L) (pCi/L)

Gamma Water I-131 E12349 4th 1/23/2019 8.19E+01 8.04E+01 1.02 Acceptable Ce-141 E12349 4th 1/23/2019 1.26E+02 1.24E+02 1.02 Acceptable Cr-51 E12349 4th 1/23/2019 3.20E+02 2.78E+02 1.15 Acceptable Cs-134 E12349 4th 1/23/2019 1.41E+02 1.60E+02 0.88 Acceptable Cs-137 E12349 4th 1/23/2019 1.21E+02 1.13E+02 1.07 Acceptable Co-58 E12349 4th 1/23/2019 1.09E+02 1.11E+02 0.99 Acceptable Mn-54 E12349 4th 1/23/2019 1.51E+02 1.44E+02 1.05 Acceptable Fe-59 E12349 4th 1/23/2019 1.16E+02 1.07E+02 1.09 Acceptable Zn-65 E12349 4th 1/23/2019 2.76E+02 2.46E+02 1.12 Acceptable Co-60 E12349 4th 1/23/2019 2.06E+02 1.98E+02 1.04 Acceptable Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi/L) (pCi/L)

Milk Sr-89 E12347 4th 1/23/2019 8.67E+01 9.19E+01 0.94 Acceptable Sr-90 E12347 4th 1/23/2019 1.07E+01 1.33E+01 0.80 Acceptable I-131 E12348 4th 1/23/2019 9.58E+01 9.33E+01 1.03 Acceptable Ce-141 E12348 4th 1/23/2019 1.37E+02 1.33E+02 1.03 Acceptable Cr-51 E12348 4th 1/23/2019 2.66E+02 2.98E+02 0.89 Acceptable Cs-134 E12348 4th 1/23/2019 1.52E+02 1.71E+02 0.89 Acceptable Cs-137 E12348 4th 1/23/2019 1.25E+02 1.21E+02 1.03 Acceptable Co-58 E12348 4th 1/23/2019 1.19E+02 1.19E+02 1.00 Acceptable Mn-54 E12348 4th 1/23/2019 1.70E+02 1.54E+02 1.10 Acceptable Fe-59 E12348 4th 1/23/2019 1.25E+02 1.14E+02 1.09 Acceptable Zn-65 E12348 4th 1/23/2019 2.75E+02 2.64E+02 1.04 Acceptable Co-60 E12348 4th 1/23/2019 2.12E+02 2.12E+02 1.00 Acceptable Sample/ Radionuclide Sample Quarter Report Date GEL Reference Ratio Evaluation Analysis Number 2018 Value Value (pCi) (pCi)

Cartridge I-131 E12346 4th 1/23/2019 8.92E+01 8.98E+01 0.99 Acceptable TABLE A-4 HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/g) (pCi/g)

Gamma Soil Ce-141 E12099 1st 4/4/2018 1.35E-01 1.18E-01 1.15 Acceptable Detector 1 Co-58 E12099 1st 4/4/2018 1.77E-01 1.74E-01 1.01 Acceptable Co-60 E12099 1st 4/4/2018 2.81E-01 2.86E-01 0.98 Acceptable Cr-51 E12099 1st 4/4/2018 4.76E-01 4.98E-01 0.96 Acceptable Cs-134 E12099 1st 4/4/2018 2.71E-01 2.75E-01 0.99 Acceptable Cs-137 E12099 1st 4/4/2018 3.42E-01 3.37E-01 1.01 Acceptable Fe-59 E12099 1st 4/4/2018 2.20E-01 2.12E-01 1.04 Acceptable Mn-54 E12099 1st 4/4/2018 2.12E-01 2.01E-01 1.06 Acceptable Zn-65 E12099 1st 4/4/2018 3.72E-01 3.74E-01 1.00 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/g) (pCi/g)

Gamma Soil Ce-141 E12099 1st 4/4/2018 1.31E-01 1.18E-01 1.11 Acceptable Detector 3 Co-58 E12099 1st 4/4/2018 1.64E-01 1.74E-01 0.94 Acceptable Co-60 E12099 1st 4/4/2018 2.73E-01 2.86E-01 0.95 Acceptable Cr-51 E12099 1st 4/4/2018 4.97E-01 4.98E-01 1.00 Acceptable Cs-134 E12099 1st 4/4/2018 2.70E-01 2.75E-01 0.98 Acceptable Cs-137 E12099 1st 4/4/2018 3.46E-01 3.37E-01 1.03 Acceptable Fe-59 E12099 1st 4/4/2018 2.19E-01 2.12E-01 1.03 Acceptable Mn-54 E12099 1st 4/4/2018 2.08E-01 2.01E-01 1.04 Acceptable Zn-65 E12099 1st 4/4/2018 3.93E-01 3.74E-01 1.05 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/g) (pCi/g)

Gamma Soil Ce-141 E12099 1st 4/4/2018 1.33E-01 1.18E-01 1.13 Acceptable Det 0848 Co-58 E12099 1st 4/4/2018 1.82E-01 1.74E-01 1.04 Acceptable Co-60 E12099 1st 4/4/2018 2.67E-01 2.86E-01 0.93 Acceptable Cr-51 E12099 1st 4/4/2018 5.31E-01 4.98E-01 1.07 Acceptable Cs-134 E12099 1st 4/4/2018 2.71E-01 2.75E-01 0.99 Acceptable Cs-137 E12099 1st 4/4/2018 3.62E-01 3.37E-01 1.07 Acceptable Fe-59 E12099 1st 4/4/2018 2.10E-01 2.12E-01 0.99 Acceptable Mn-54 E12099 1st 4/4/2018 2.17E-01 2.01E-01 1.08 Acceptable Zn-65 E12099 1st 4/4/2018 3.72E-01 3.74E-01 1.00 Acceptable TABLE A-4 (Continued)

HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

Gamma Soil Ce-141 E12099 1st 4/4/2018 1.31E-01 1.18E-01 1.11 Acceptable Detector 6 Co-58 E12099 1st 4/4/2018 1.72E-01 1.74E-01 0.99 Acceptable Co-60 E12099 1st 4/4/2018 2.81E-01 2.86E-01 0.98 Acceptable Cr-51 E12099 1st 4/4/2018 4.86E-01 4.98E-01 0.98 Acceptable Cs-134 E12099 1st 4/4/2018 2.62E-01 2.75E-01 0.95 Acceptable Cs-137 E12099 1st 4/4/2018 3.37E-01 3.37E-01 1.00 Acceptable Fe-59 E12099 1st 4/4/2018 2.22E-01 2.12E-01 1.05 Acceptable Mn-54 E12099 1st 4/4/2018 2.10E-01 2.01E-01 1.05 Acceptable Zn-65 E12099 1st 4/4/2018 3.63E-01 3.74E-01 0.97 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Air Filter Gross Alpha E12194 2nd 6/7/2018 1.29E+02 1.16E+02 1.11 Acceptable Protean 7108 Gross Beta E12194 2nd 6/7/2018 2.40E+02 2.34E+02 1.02 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Air Filter Gross Alpha E12194 2nd 6/7/2018 1.30E+02 1.16E+02 1.12 Acceptable Protean 7109 Gross Beta E12194 2nd 6/7/2018 2.38E+02 2.34E+02 1.02 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Air Filter Gross Alpha E12194 2nd 6/7/2018 1.28E+02 1.16E+02 1.10 Acceptable Tennelec-1171 Gross Beta E12194 2nd 6/7/2018 2.42E+02 2.34E+02 1.03 Acceptable Sample/ Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Gamma Air Ce-141 E12195 2nd 6/7/2018 1.57E+02 1.45E+02 1.08 Acceptable Filter Co-58 E12195 2nd 6/7/2018 1.63E+02 1.57E+02 1.04 Acceptable Detector 1 Co-60 E12195 2nd 6/7/2018 2.04E+02 2.00E+02 1.02 Acceptable Cr-51 E12195 2nd 6/7/2018 4.24E+02 4.21E+02 1.01 Acceptable Cs-134 E12195 2nd 6/7/2018 1.83E+02 2.00E+02 0.91 Acceptable Cs-137 E12195 2nd 6/7/2018 1.83E+02 1.74E+02 1.05 Acceptable Fe-59 E12195 2nd 6/7/2018 1.70E+02 1.52E+02 1.12 Acceptable Mn-54 E12195 2nd 6/7/2018 2.45E+02 2.29E+02 1.07 Acceptable Zn-65 E12195 2nd 6/7/2018 3.02E+02 2.78E+02 1.09 Acceptable TABLE A-4 (Continued)

HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Gamma Air Ce-141 E12195 2nd 6/7/2018 1.45E+02 1.45E+02 1.00 Acceptable Filter Co-58 E12195 2nd 6/7/2018 1.54E+02 1.57E+02 0.98 Acceptable Detector 3 Co-60 E12195 2nd 6/7/2018 1.93E+02 2.00E+02 0.96 Acceptable Cr-51 E12195 2nd 6/7/2018 4.17E+02 4.21E+02 0.99 Acceptable Cs-134 E12195 2nd 6/7/2018 1.75E+02 2.00E+02 0.87 Acceptable Cs-137 E12195 2nd 6/7/2018 1.78E+02 1.74E+02 1.02 Acceptable Fe-59 E12195 2nd 6/7/2018 1.57E+02 1.52E+02 1.04 Acceptable Mn-54 E12195 2nd 6/7/2018 2.37E+02 2.29E+02 1.04 Acceptable Zn-65 E12195 2nd 6/7/2018 3.02E+02 2.78E+02 1.09 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

TriCarb Tritium (H3) E12265 3rd 10/9/2018 4.29E+03 3.80E+03 1.13 Acceptable Sample/ Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Gamma Water Ce-141 E12266 3rd 10/9/2018 1.37E+02 1.33E+02 1.03 Acceptable Detector 1 Co-58 E12266 3rd 10/9/2018 1.51E+02 1.50E+02 1.01 Acceptable Co-60 E12266 3rd 10/9/2018 1.96E+02 1.98E+02 0.99 Acceptable Cr-51 E12266 3rd 10/9/2018 2.52E+02 2.75E+02 0.91 Acceptable Cs-134 E12266 3rd 10/9/2018 1.10E+02 1.28E+02 0.86 Acceptable Cs-137 E12266 3rd 10/9/2018 1.56E+02 1.54E+02 1.02 Acceptable Fe-59 E12266 3rd 10/9/2018 1.27E+02 1.24E+02 1.02 Acceptable I-131 E12266 3rd 10/9/2018 6.37E+01 6.25E+01 1.02 Acceptable Mn-54 E12266 3rd 10/9/2018 1.83E+02 1.74E+02 1.05 Acceptable Zn-65 E12266 3rd 10/9/2018 2.03E+02 2.09E+02 0.97 Acceptable TABLE A-4 (Continued)

HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

Gamma Water Ce-141 E12266 3rd 10/9/2018 1.35E+02 1.33E+02 1.01 Acceptable Detector 3 Co-58 E12266 3rd 10/9/2018 1.50E+02 1.50E+02 1.00 Acceptable Co-60 E12266 3rd 10/9/2018 1.96E+02 1.98E+02 0.99 Acceptable Cr-51 E12266 3rd 10/9/2018 2.75E+02 2.75E+02 1.00 Acceptable Cs-134 E12266 3rd 10/9/2018 1.11E+02 1.28E+02 0.87 Acceptable Cs-137 E12266 3rd 10/9/2018 1.51E+02 1.54E+02 0.98 Acceptable Fe-59 E12266 3rd 10/9/2018 1.28E+02 1.24E+02 1.03 Acceptable I-131 E12266 3rd 10/9/2018 5.96E+01 6.25E+01 0.95 Acceptable Mn-54 E12266 3rd 10/9/2018 1.83E+02 1.74E+02 1.05 Acceptable Zn-65 E12266 3rd 10/9/2018 2.21E+02 2.09E+02 1.06 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Gamma Water Ce-141 E12266 3rd 10/9/2018 1.40E+02 1.33E+02 1.05 Acceptable Det 0848 Co-58 E12266 3rd 10/9/2018 1.58E+02 1.50E+02 1.06 Acceptable Co-60 E12266 3rd 10/9/2018 1.91E+02 1.98E+02 0.97 Acceptable Cr-51 E12266 3rd 10/9/2018 2.85E+02 2.75E+02 1.03 Acceptable Cs-134 E12266 3rd 10/9/2018 1.14E+02 1.28E+02 0.89 Acceptable Cs-137 E12266 3rd 10/9/2018 1.63E+02 1.54E+02 1.06 Acceptable Fe-59 E12266 3rd 10/9/2018 1.34E+02 1.24E+02 1.08 Acceptable I-131 E12266 3rd 10/9/2018 6.67E+01 6.25E+01 1.07 Acceptable Mn-54 E12266 3rd 10/9/2018 1.85E+02 1.74E+02 1.06 Acceptable Zn-65 E12266 3rd 10/9/2018 2.14E+02 2.09E+02 1.02 Acceptable Sample/ Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi) (pCi)

Gamma Soil Ce-141 E12328 4th 12/20/2018 2.34E-01 2.23E-01 1.05 Acceptable Detector 1 Co-58 E12328 4th 12/20/2018 1.96E-01 1.99E-01 0.99 Acceptable Co-60 E12328 4th 12/20/2018 3.46E-01 3.55E-01 0.97 Acceptable Cr-51 E12328 4th 12/20/2018 4.50E-01 4.99E-01 0.90 Acceptable Cs-134 E12328 4th 12/20/2018 2.65E-01 2.87E-01 0.92 Acceptable Cs-137 E12328 4th 12/20/2018 2.56E-01 2.75E-01 0.93 Acceptable Fe-59 E12328 4th 12/20/2018 1.90E-01 1.91E-01 0.99 Acceptable Mn-54 E12328 4th 12/20/2018 2.71E-01 2.58E-01 1.05 Acceptable Zn-65 E12328 4th 12/20/2018 4.47E-01 4.42E-01 1.01 Acceptable TABLE A-4 (Continued)

HBPP PARTICIPATION - ECKERT & ZIEGLER INTERLABORATORY CROSS-CHECK PROGRAM DATA Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

Gamma Soil Ce-141 E12328 4th 12/20/2018 2.30E-01 2.23E-01 1.03 Acceptable Detector 3 Co-58 E12328 4th 12/20/2018 1.90E-01 1.99E-01 0.96 Acceptable Co-60 E12328 4th 12/20/2018 3.42E-01 3.55E-01 0.96 Acceptable Cr-51 E12328 4th 12/20/2018 4.82E-01 4.99E-01 0.97 Acceptable Cs-134 E12328 4th 12/20/2018 2.67E-01 2.87E-01 0.93 Acceptable Cs-137 E12328 4th 12/20/2018 2.62E-01 2.75E-01 0.95 Acceptable Fe-59 E12328 4th 12/20/2018 1.89E-01 1.91E-01 0.99 Acceptable Mn-54 E12328 4th 12/20/2018 2.65E-01 2.58E-01 1.03 Acceptable Zn-65 E12328 4th 12/20/2018 4.57E-01 4.42E-01 1.03 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

Gamma Soil Ce-141 E12328 4th 12/20/2018 2.34E-01 2.23E-01 1.05 Acceptable Det 0848 Co-58 E12328 4th 12/20/2018 1.97E-01 1.99E-01 0.99 Acceptable Co-60 E12328 4th 12/20/2018 3.28E-01 3.55E-01 0.92 Acceptable Cr-51 E12328 4th 12/20/2018 5.10E-01 4.99E-01 1.02 Acceptable Cs-134 E12328 4th 12/20/2018 2.71E-01 2.87E-01 0.95 Acceptable Cs-137 E12328 4th 12/20/2018 2.78E-01 2.75E-01 1.01 Acceptable Fe-59 E12328 4th 12/20/2018 1.77E-01 1.91E-01 0.92 Acceptable Mn-54 E12328 4th 12/20/2018 2.76E-01 2.58E-01 1.07 Acceptable Zn-65 E12328 4th 12/20/2018 4.37E-01 4.42E-01 0.99 Acceptable Sample Radionuclide Sample Quarter Report HBPP Reference Ratio Evaluation Analysis Number 2018 Date (pCi/L) (pCi/L)

Gamma Soil Ce-141 E12328 4th 12/20/2018 2.31E-01 2.23E-01 1.04 Acceptable Detector 6 Co-58 E12328 4th 12/20/2018 1.95E-01 1.99E-01 0.98 Acceptable Co-60 E12328 4th 12/20/2018 3.41E-01 3.55E-01 0.96 Acceptable Cr-51 E12328 4th 12/20/2018 4.93E-01 4.99E-01 0.99 Acceptable Cs-134 E12328 4th 12/20/2018 2.64E-01 2.87E-01 0.92 Acceptable Cs-137 E12328 4th 12/20/2018 2.68E-01 2.75E-01 0.97 Acceptable Fe-59 E12328 4th 12/20/2018 1.85E-01 1.91E-01 0.97 Acceptable Mn-54 E12328 4th 12/20/2018 2.68E-01 2.58E-01 1.04 Acceptable Zn-65 E12328 4th 12/20/2018 4.48E-01 4.42E-01 1.01 Acceptable Table A-4 Notes:

1. Analysis results based on 10-minute count times for alpha and beta analysis on Proteans SN 7108, SN 7109, and Tennelec SN 1171. Alpha filter cross checks normally performed on each Protean gas flow proportional counter at count times of 5 minutes, 10 minutes, and 20 minutes. Beta filter cross checks normally performed on each Protean gas flow proportional counter at count times of 5 minutes and 10 minutes.

TABLE C-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL REPORT

SUMMARY

Name of Facility Humboldt Bay Power Plant Unit 3 Docket No. 50-133; License No. DPR-7 Location of Facility Humboldt County, California Reporting Period January 1 - December 31, 2018 (County, State)

Medium or Type and Lower Limit All Indicator Locations Location with Control Number Pathway Total of Detection Highest Annual Mean Locations of Non-Sampled Number of (LLD) routine

[Unit of Analyses Reported Measurement] Performed Mean, (Fraction), & [Range]b Name Mean, Mean, Measure-(Fraction) (Fraction) ments

& [Range]b & [Range]b (53) samples per

Gross Beta East Fence (AM1) Annex Gross Alpha Humboldt Hill N/A AIRBORNE station 1.00E-02 Gross Alpha (pCi/m3) mean 2.85E-03, (8/53), [2.35E-03 to 4.09E-03] (AM3) (pCi/m3) mean (Station 3)

Gross Beta, pCi/m3 Gross Beta (pCi/m3) mean 1.16E-02, (48/53), [3.42E-03 to 4.62E-02] 3.41E-03, (9/53), Gross Alpha Particulates

Gross Alpha Building 12 (AM2) [2.41E-03 to (pCi/m3) mean

Gamma

Gamma Gross Alpha (pCi/m3) mean 3.01E-03, (14/53), [1.90E-03 to 6.71E-03] 6.10E-03] 3.77E-03,

[pCi/m3] Isotopic Isotopic Gross Beta (pCi/m3) mean 1.10E-02, (51/53), [3.66E-03 to 4.84E-02] (4/53),

analysis on analysis on Annex (AM3) [3.05E-03 to quarterly quarterly Gross Alpha (pCi/m3) mean 3.41E-03, (9/53), [2.41E-03 to 6.10E-03] 5.47E-03]

composite (by composite Gross Beta (pCi/m3) mean 1.20E-02, (50/53), [3.44E-03 to 5.09E-02]

station) (by station) Relay Building (AM4) Relay Gross Beta Gross Beta Gross Alpha (pCi/m3) mean 2.98E-03, (8/53), [2.38E-03 to 4.27E-03] Bldg. (pCi/m3) mean (pCi/m3) mean (4) Onsite Gross Beta (pCi/m3) mean 1.24E-02, (50/53), [3.50E-03 to 4.37E-02] (AM1) 1.24E-02, 9.90E-03,

Cs-137 Oil Water Separator (OWS - AM5) (50/53), (45/53),

Locations 6.00E-02 Gross Alpha (pCi/m3) mean 2.57E-03, (6/26), [2.25E-03 to 3.62E-03] [3.50E-03 to [2.94E-03 to (1) Offsite pCi/m3 Gross Beta (pCi/m3) mean 9.69E-03, (25/26), [3.90E-03 to 1.84E-02] 4.37E-02] 4.28E-02]

Locations Cs-137 <MDA (63) Fence line 5 mRem Fence Line TLDs (T1 to T16) Station T9 (mR/qtr) Stations 1, 2, 0 DIRECT TLD readings 13.0 +/- 0.1, (63/63), [10.4 to 17.0] T-9, mean 14, 25 and T17 RADIATION Figure 15.9 +/- 0.4, (mR/qtr) mean (20) Off-site TLD B-1 (4/4), [15.3 to 12.9 +/- 0.1,

[mR/quarter] Readings 17.0] (20/20),

[10.0 to 16.8]

TABLE C-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL REPORT

SUMMARY

Type All Indicator Location with Highest Annual Mean Control Medium or and Total Lower Locations Locations Number of Pathway Sampled Number of Limit of Mean, Name, Mean, Mean, Non-routine

[Unit of Analyses Detectiona (Fraction) Distance and (Fraction) (Fraction) Reported Measurement] Performed (LLD) & [Range] b Direction & [Range] b & [Range] b Measurements 0

WATERBORNE Groundwater Not Required N/A N/A N/A N/A Not Required Not Required Drinking Water Not Required N/A N/A N/A N/A Not Required N/A Sediment Not Required N/A N/A N/A N/A Not Required N/A Algae Not Required N/A N/A N/A N/A Not Required N/A INGESTION Not Required N/A N/A N/A N/A Not Required N/A TERRESTRIAL Soil Not Required N/A N/A N/A N/A Not Required N/A a

The LLD is defined as the smallest concentration of radioactive material in a sample that will yield a net count, above system background, that will be detected with 95 percent probability with only 5 percent probability of falsely concluding that a blank observation represents a real signal.

LLD is defined as the a priori (before the fact) lower limit of detection (as pCi per unit mass or volume) representing the capability of a measurement system and not as the a posteriori (after the fact) limit for a particular measurement. (Current literature defines the LLD as the detection capability for the instrumentation only, and the MDA, minimum detectable concentration, as the detection capability for a given instrument, procedure and type of sample.) The actual MDA values for the radionuclide specific analyses were at or below the LLD.

b The mean and the range are based on detectable measurements only. The fraction of detectable measurements at specified locations is indicated in parentheses; e.g., (10/12) means that 10 out of 12 samples contained detectable activity. The range of detected results is indicated in brackets; e.g.,

[23 to 34].

Not Required: Not required by the HBPP Unit 3 Technical Specifications or the SAFSTOR Offsite Dose Calculation Manual. Baseline environmental conditions for this parameter were established in the Environmental Report as referenced by the SAFSTOR Decommissioning Plan (now identified as the Post Shutdown Decommissioning Activities Report and Defueled Safety Analysis Report).

N/A - Not applicable TABLE C-2 ONSITE ENVIRONMENTAL TLD STATIONS Station TLD Exposure Measurements (mR)

Number First Quarter Second Quarter Third Quarter Fourth Quarter T1 12.4 +/- 0.1 12.9 +/- 0.4 14.1 +/- 0.5 15.7 +/- 0.4 T2 12.1 +/- 0.2 12.9 +/- 0.3 13.4 +/- 0.3 14.4 +/- 0.3 T3 11.4 +/- 0.2 12.3 +/- 0.3 13.0 +/- 0.5 14.1 +/- 0.3 T4 12.1 +/- 0.3 12.2 +/- 0.6 13.3 +/- 0.5 14.6 +/- 0.4 T5 10.9 +/- 0.3 11.7 +/- 0.3 12.8 +/- 0.3 13.6 +/- 0.1 T6 10.4 +/- 0.1 10.8 +/- 0.0 12.0 +/- 0.1 13.1 +/- 0.2 T7 10.7 +/- 0.4 11.2 +/- 0.2 11.9 +/- 0.7 13.5 +/- 0.1 T8 10.8 +/- 0.4 11.6 +/- 0.5 13.3 +/- 0.2 13.8 +/- 0.3 T9 15.5 +/- 0.5 15.3 +/- 0.2 17.0 +/- 1.3 15.6 +/- 0.2 T10 11.6 +/- 0.1 1 15.2 +/- 1.1 14.7 +/- 0.2 T11 11.4 +/- 0.0 12.3 +/- 0.3 13.4 +/- 0.2 14.1 +/- 0.9 T12 11.8 +/- 0.1 12.9 +/- 0.4 13.6 +/- 0.1 14.8 +/- 0.3 T13 11.5 +/- 0.6 12.7 +/- 0.3 13.9 +/- 0.3 14.1 +/- 0.9 T14 12.4 +/- 0.1 12.8 +/- 0.2 14.2 +/- 0.6 14.6 +/- 0.6 T15 11.7 +/- 0.1 12.0 +/- 0.3 13.3 +/- 0.1 14.5 +/- 0.2 T16 12.1 +/- 0.1 12.6 +/- 0.2 13.3 +/- 0.7 14.7 +/- 0.4 Calculated Parameters (mR)

Parameter First Quarter Second Quarter Third Quarter Fourth Quarter Average 11.8 +/- 0.1 12.4 +/- 0.1 13.6 +/- 0.1 14.4 +/- 0.1 Maximum 15.5 +/- 0.5 15.3 +/- 0.2 17.0 +/- 1.3 15.7 +/- 0.4 Table C-2 Notes:

1. Corrective action SAPN 1443647 documents the TLD at location T10 was lost at the end of the second quarter 2018.

2. These exposures are reported for a standardized period of 90 days.

3. The reported exposures do not have an average background subtracted.

TABLE C-3 OFFSITE (Control) ENVIRONMENTAL TLD STATIONS Station TLD Exposure Measurements (mR)

Number First Quarter Second Quarter Third Quarter Fourth Quarter 1 10.9 +/- 0.7 12.1 +/- 0.4 15.5 +/- 0.7 13.9 +/- 0.2 2 12.8 +/- 0.5 13.3 +/- 0.4 16.8 +/- 0.5 15.8 +/- 0.1 14 10.0 +/- 0.6 11.1 +/- 0.2 15.2 +/- 0.8 12.6 +/- 0.7 25 10.8 +/- 0.4 11.4 +/- 0.2 15.1 +/- 0.1 12.9 +/- 0.3 T17 10.7 +/- 0.3 11.3 +/- 0.4 12.5 +/- 0.3 13.5 +/- 0.1 Calculated Parameters (mR)

Parameter First Quarter Second Quarter Third Quarter Fourth Quarter Average 11.0 +/- 0.2 11.8 +/- 0.1 15.0 +/- 0.2 13.7 +/- 0.2 Maximum 12.8 +/- 0.5 13.3 +/- 0.4 16.8 +/- 0.5 15.8 +/- 0.1 Table C-3 Notes:

1. These exposures are reported for a standardized period of 90 days.

Table C-4 ODCM REQUIRED AIR SAMPLES: EAST FENCE (AM1)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 2.40E-03 +/- 1.90E-03 1.47E-02 +/- 4.41E-03 1/4/2018 < 3.46E-03 (MDA) 8.46E-03 +/- 3.70E-03 1/11/2018 < 3.39E-03 (MDA) 7.59E-03 +/- 3.54E-03 1/18/2018 < 3.38E-03 (MDA) 3.72E-03 +/- 2.97E-03 1/25/2018 < 3.42E-03 (MDA) 3.42E-03 +/- 2.96E-03 2/1/2018 < 3.39E-03 (MDA) 9.68E-03 +/- 3.82E-03

<1.48E-03 < 1.39E-03 2/8/2018 < 3.37E-03 (MDA) 9.63E-03 +/- 3.80E-03 (MDA) (MDA) 2/15/2018 < 3.40E-03 (MDA)3 9.36E-03 +/- 3.77E-033 2/22/2018 < 3.46E-03 (MDA)4 7.38E-03 +/- 3.55E-034 3/1/2018 < 3.40E-03 (MDA) 4.45E-03 +/- 3.10E-03 3/8/2018 < 3.35E-03 (MDA) 6.12E-03 +/- 3.31E-03 3/15/2018 < 3.32E-03 (MDA) < 5.77E-03 (MDA) 3/22/2018 < 3.56E-03 (MDA) < 6.18E-03 (MDA) 3/29/2018 < 5.41E-03 (MDA)5 1.04E-02 +/- 5.43E-035 4/4/2018 < 2.87E-03 (MDA) 7.18E-03 +/- 3.09E-03 4/12/2018 < 3.32E-03 (MDA) 6.52E-03 +/- 3.32E-03 4/19/2018 < 1.93E-03 (MDA)8,9 1.54E-02 +/- 4.44E-038,9 4/26/2018 < 3.25E-03 (MDA) 1.33E-02 +/- 4.14E-03 5/5/2018 < 4.59E-03 (MDA)10 1.54E-02 +/- 5.45E-0310

< 2.76E-03 < 2.47E-03 5/10/2018 < 3.23E-03 (MDA) 7.03E-03 +/- 3.33E-03 (MDA) (MDA) 5/17/2018 < 3.48E-03 (MDA)11 1.80E-02 +/- 4.84E-0311 5/24/2018 < 3.30E-03 (MDA) 5.78E-03 +/- 3.20E-03 5/31/2018 < 3.82E-03 (MDA)12 1.04E-02 +/- 4.21E-0312 6/7/2018 < 3.29E-03 (MDA)13 < 5.70E-03 (MDA)13 6/14/2018 < 3.38E-03 (MDA) 7.36E-03 +/- 3.49E-03 6/21/2018 < 3.82E-03 (MDA) 7.10E-03 +/- 3.76E-03 6/27/2018 < 2.71E-02 (MDA)15 9.09E-03 +/- 2.31E-0315 7/10/2018 < 2.13E-02 (MDA)15 7.15E-03 +/- 4.65E-0315 7/11/2018 3.57E-03 +/- 2.33E-03 8.40E-03 +/- 3.62E-03 7/18/2018 < 3.30E-03 (MDA) 4.38E-03 +/- 2.99E-03 7/25/2018 < 3.22E-03 (MDA) 5.65E-03 +/- 3.12E-03 8/1/2018 < 3.37E-03 (MDA) 7.35E-03 +/- 3.48E-03 8/8/2018 < 3.29E-03 (MDA) < 5.69E-03 (MDA) < 2.37E-03 < 2.46E-03 8/15/2018 2.35E-03 +/- 1.86E-03 4.74E-03 +/- 3.05E-03 (MDA) (MDA) 8/22/2018 < 3.52E-03 (MDA) 7.86E-03 +/- 3.67E-03 8/29/2018 < 3.43E-03 (MDA) 3.77E-03 +/- 3.01E-03 9/5/2018 < 3.35E-03 (MDA) 1.05E-02 +/- 3.89E-03 9/12/2018 < 3.33E-03 (MDA) 1.90E-02 +/- 4.81E-03 9/19/2018 2.39E-03 +/- 1.89E-03 2.22E-02 +/- 5.14E-03 9/26/2018 2.47E-03 +/- 1.95E-03 1.98E-02 +/- 5.02E-03 10/3/2018 2.45E-03 +/- 1.93E-03 1.24E-02 +/- 4.19E-03 10/10/2018 < 3.32E-03 (MDA) 2.49E-02 +/- 5.35E-03 10/17/2018 3.05E-03 +/- 2.17E-03 2.81E-02 +/- 5.72E-03 10/24/2018 < 3.45E-03 (MDA) 9.48E-03 +/- 3.82E-03 10/31/2018 < 3.52E-03 (MDA) 1.26E-02 +/- 4.25E-03 11/7/2018 4.09E-03 +/- 2.47E-03 3.50E-02 +/- 6.15E-03

< 2.95E-03 < 2.65E-03 11/14/2018 < 3.49E-03 (MDA) 4.62E-02 +/- 7.12E-03 (MDA) (MDA) 11/21/2018 < 3.39E-03 (MDA) 7.39E-03 +/- 3.51E-03 11/28/2018 < 3.48E-03 (MDA) < 6.02E-03 (MDA) 12/5/2018 < 3.27E-03 (MDA) 1.52E-02 +/- 4.36E-03 12/12/2018 < 3.51E-03 (MDA) 1.04E-02 +/- 3.98E-03 12/19/2018 < 3.44E-03 (MDA) 8.02E-03 +/- 3.63E-03 12/26/2018 < 3.40E-03 (MDA) 7.59E-03 +/- 3.54E-03 Table C-4 (Continued)

ODCM REQUIRED AIR SAMPLES: GWTS (AM2)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 < 4.29E-03 (MDA)1 1.04E-02 +/- 2.99E-031 1/4/2018 < 3.45E-03 (MDA) 4.16E-03 +/- 3.09E-03 1/11/2018 < 3.40E-03 (MDA) 5.15E-03 +/- 3.20E-03 1/18/2018 < 3.38E-03 (MDA) 5.11E-03 +/- 3.18E-03 1/25/2018 < 3.42E-03 (MDA) 6.95E-03 +/- 3.48E-03 2/1/2018 < 3.38E-03 (MDA) 1.11E-02 +/- 3.97E-03

<1.64E-03 < 1.18E-03 2/8/2018 < 3.38E-03 (MDA) 1.94E-02 +/- 4.87E-03 (MDA) (MDA) 2/15/2018 < 3.39E-03 (MDA) 5.84E-03 +/- 3.30E-03 2/22/2018 < 3.45E-03 (MDA) 5.93E-03 +/- 3.35E-03 3/1/2018 < 3.40E-03 (MDA) 5.50E-03 +/- 3.25E-03 3/8/2018 2.36E-03 +/- 1.87E-03 4.74E-03 +/- 3.11E-03 3/15/2018 < 3.32E-03 (MDA) 5.38E-03 +/- 3.18E-03 3/22/2018 < 3.55E-03 (MDA) 7.94E-03 +/- 3.70E-03 3/29/2018 < 3.39E-03 (MDA) 1.53E-02 +/- 4.45E-03 4/5/2018 < 3.34E-03 (MDA)6 8.34E-03 +/- 3.59E-036 4/12/2018 < 3.42E-03 (MDA)7 9.27E-03 +/- 3.77E-037 4/19/2018 1.90E-03 +/- 1.25E-03 1.72E-02 +/- 4.62E-03 4/26/2018 < 3.18E-03 (MDA) 1.40E-02 +/- 4.16E-03 5/3/2018 < 3.44E-03 (MDA) 1.19E-02 +/- 4.12E-03

< 2.63E-03 < 2.35E-03 5/10/2018 < 3.19E-03 (MDA) 8.29E-03 +/- 3.48E-03 (MDA) (MDA) 5/17/2018 3.62E-03 +/- 2.36E-03 1.98E-02 +/- 4.96E-03 5/24/2018 < 3.30E-03 (MDA) 5.08E-03 +/- 3.10E-03 5/31/2018 < 3.28E-03 (MDA) 8.55E-03 +/- 3.59E-03 6/7/2018 2.32E-03 +/- 1.83E-03 7.11E-03 +/- 3.37E-03 6/14/2018 < 3.38E-03 (MDA) 5.91E-03 +/- 3.27E-03 6/21/2018 < 3.82E-03 (MDA) 7.10E-03 +/- 3.76E-03 6/27/2018 < 3.92E-03 (MDA) < 6.79E-03 (MDA) 7/3/2018 < 2.86E-03 (MDA) 8.06E-03 +/- 3.20E-03 7/11/2018 < 3.37E-03 (MDA) 9.84E-03 +/- 3.82E-03 7/18/2018 < 4.63E-03 (MDA)16 < 8.01E-03 (MDA)16 7/26/2018 < 3.88E-03 (MDA)16 3.90E-03 +/- 3.30E-0316 8/1/2018 < 3.37E-03 (MDA)18 5.91E-03 +/- 3.27E-0318 8/8/2018 2.34E-03 +/- 1.85E-03 3.66E-03 +/- 2.87E-03 < 2.69E-03 < 2.21E-03 8/15/2018 < 3.31E-03 (MDA) 1.04E-02 +/- 3.84E-03 (MDA) (MDA) 8/22/2018 < 3.52E-03 (MDA) 6.41E-03 +/- 3.47E-03 8/29/2018 3.01E-03 +/- 2.15E-03 1.05E-02 +/- 3.94E-03 9/5/2018 2.96E-03 +/- 2.11E-03 4.79E-03 +/- 3.08E-03 9/12/2018 < 3.33E-03 (MDA) 1.26E-02 +/- 4.12E-03 9/19/2018 < 3.39E-03 (MDA) 1.63E-02 +/- 4.56E-03 9/26/2018 2.48E-03 +/- 1.96E-03 1.51E-02 +/- 4.53E-03 10/3/2018 < 3.47E-03 (MDA) 1.24E-02 +/- 4.19E-03 10/10/2018 2.36E-03 +/- 1.86E-03 2.24E-02 +/- 5.12E-03 10/17/2018 < 3.47E-03 (MDA) 3.28E-02 +/- 6.10E-03 10/24/2018 < 3.46E-03 (MDA) 1.31E-02 +/- 4.26E-03 10/31/2018 3.70E-03 +/- 2.41E-03 1.51E-02 +/- 4.53E-03 11/7/2018 2.94E-03 +/- 2.09E-03 2.68E-02 +/- 5.50E-03

< 2.99E-03 < 2.49E-03 11/14/2018 6.71E-03 +/- 3.28E-03 4.84E-02 +/- 7.27E-03 (MDA) (MDA) 11/21/2018 < 3.36E-03 (MDA) 7.67E-03 +/- 3.52E-03 11/28/2018 3.08E-03 +/- 2.20E-03 1.00E-02 +/- 3.94E-03 12/5/2018 2.33E-03 +/- 1.84E-03 1.27E-02 +/- 4.08E-03 12/12/2018 < 3.51E-03 (MDA) 5.29E-03 +/- 3.29E-03 12/19/2018 < 3.44E-03 (MDA) 6.25E-03 +/- 3.38E-03 12/26/2018 < 3.40E-03 (MDA) 7.24E-03 +/- 3.49E-03 Table C-4 (Continued)

ODCM REQUIRED AIR SAMPLES: ANNEX BUILDING (AM3)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 2.41E-03 +/- 1.90E-03 1.93E-02 +/- 4.90E-03 1/4/2018 < 3.45E-03 (MDA) 3.44E-03 +/- 2.98E-03 1/11/2018 < 3.45E-03 (MDA)2 8.79E-03 +/- 3.74E-032 1/18/2018 2.96E-03 +/- 2.11E-03 3.71E-03 +/- 2.96E-03 1/25/2018 < 3.42E-03 (MDA) 5.89E-03 +/- 3.32E-03 2/1/2018 < 3.39E-03 (MDA) 5.14E-03 +/- 3.19E-03

<1.28E-03 < 1.23E-03 2/8/2018 < 3.38E-03 (MDA) 2.08E-02 +/- 4.99E-03 (MDA) (MDA) 2/15/2018 < 3.39E-03 (MDA) 6.89E-03 +/- 3.45E-03 2/22/2018 < 3.45E-03 (MDA) 9.49E-03 +/- 3.83E-03 3/1/2018 < 3.39E-03 (MDA) 6.89E-03 +/- 3.46E-03 3/8/2018 < 3.37E-03 (MDA) 4.40E-03 +/- 3.06E-03 3/15/2018 < 3.33E-03 (MDA) 5.38E-03 +/- 3.18E-03 3/22/2018 < 3.54E-03 (MDA) < 6.16E-03 (MDA) 3/29/2018 < 3.38E-03 (MDA) 1.35E-02 +/- 4.25E-03 4/5/2018 < 3.30E-03 (MDA) 9.28E-03 +/- 3.69E-03 4/12/2018 < 3.31E-03 (MDA) 1.00E-02 +/- 3.79E-03 4/19/2018 < 1.93E-03 (MDA) 1.61E-02 +/- 4.51E-03 4/26/2018 < 3.16E-03 (MDA) 1.13E-02 +/- 3.83E-03 5/3/2018 3.06E-03 +/- 2.18E-03 9.35E-03 +/- 3.80E-03

< 2.62E-03 < 2.34E-03 5/10/2018 < 3.19E-03 (MDA) 6.26E-03 +/- 3.19E-03 (MDA) (MDA) 5/17/2018 < 3.41E-03 (MDA) 1.36E-02 +/- 4.30E-03 5/24/2018 2.92E-03 +/- 2.08E-03 9.65E-03 +/- 3.74E-03 5/31/2018 < 3.30E-03 (MDA) 7.18E-03 +/- 3.41E-03 6/7/2018 < 3.26E-03 (MDA) 7.44E-03 +/- 3.42E-03 6/14/2018 < 3.37E-03 (MDA) 6.27E-03 +/- 3.32E-03 6/21/2018 < 3.82E-03 (MDA) 7.50E-03 +/- 3.82E-03 6/27/2018 < 3.92E-03 (MDA) 4.78E-03 +/- 3.49E-03 7/3/2018 < 2.86E-03 (MDA) 7.45E-03 +/- 3.13E-03 7/11/2018 < 3.35E-03 (MDA) < 5.81E-03 (MDA) 7/18/2018 < 4.64E-03 (MDA)16 < 8.03E-03 (MDA)16 7/25/2018 < 7.57E-03 (MDA)16,17 5.96E-03 +/- 1.81E-0316,17 8/1/2018 < 3.37E-03 (MDA)18 5.19E-03 +/- 3.16E-0318 8/8/2018 < 3.29E-03 (MDA) 5.06E-03 +/- 3.08E-03 < 2.20E-03 < 2.49E-03 8/15/2018 < 3.31E-03 (MDA) 9.33E-03 +/- 3.70E-03 (MDA) (MDA) 8/22/2018 3.09E-03 +/- 2.21E-03 8.59E-03 +/- 3.76E-03 8/29/2018 < 3.43E-03 (MDA) 1.26E-02 +/- 4.19E-03 9/5/2018 < 3.35E-03 (MDA) 8.36E-03 +/- 3.60E-03 9/12/2018 2.95E-03 +/- 2.10E-03 1.79E-02 +/- 4.70E-03 9/19/2018 < 3.39E-03 (MDA) 2.01E-02 +/- 4.94E-03 9/26/2018 < 3.51E-03 (MDA) 2.45E-02 +/- 5.44E-03 10/3/2018 < 3.48E-03 (MDA) 1.24E-02 +/- 4.20E-03 10/10/2018 < 3.32E-03 (MDA) 2.92E-02 +/- 5.73E-03 10/17/2018 < 3.47E-03 (MDA) 3.06E-02 +/- 5.94E-03 10/24/2018 < 3.46E-03 (MDA) 6.29E-03 +/- 3.40E-03 10/31/2018 < 3.52E-03 (MDA) 1.36E-02 +/- 4.37E-03 11/7/2018 4.68E-03 +/- 2.67E-03 3.50E-02 +/- 6.15E-03

< 2.61E-03 < 2.67E-03 11/14/2018 6.10E-03 +/- 3.12E-03 5.09E-02 +/- 7.43E-03 (MDA) (MDA) 11/21/2018 < 3.35E-03 (MDA) 1.55E-02 +/- 4.46E-03 11/28/2018 2.48E-03 +/- 1.96E-03 9.30E-03 +/- 3.86E-03 12/5/2018 < 3.74E-03 (MDA)19 1.53E-02 +/- 4.76E-0319 12/12/2018 < 3.51E-03 (MDA) 7.46E-03 +/- 3.60E-03 12/19/2018 < 3.44E-03 (MDA) 8.38E-03 +/- 3.67E-03 12/26/2018 < 3.39E-03 (MDA) 7.22E-03 +/- 3.48E-03 Table C-4 (Continued)

ODCM REQUIRED AIR SAMPLES: RELAY BUILDING (AM4)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 < 3.42E-03 (MDA) 2.36E-02 +/- 5.28E-03 1/4/2018 < 3.45E-03 (MDA) < 5.99E-03 (MDA) 1/11/2018 < 3.40E-03 (MDA) 9.71E-03 +/- 3.83E-03 1/18/2018 < 3.37E-03 (MDA) 6.49E-03 +/- 3.38E-03 1/25/2018 < 3.43E-03 (MDA) 9.09E-03 +/- 3.78E-03 2/1/2018 < 3.40E-03 (MDA) 5.85E-03 +/- 3.30E-03

<1.55E-03 < 1.22E-03 2/8/2018 < 3.37E-03 (MDA) 1.94E-02 +/- 4.86E-03 (MDA) (MDA) 2/15/2018 < 3.40E-03 (MDA) 8.31E-03 +/- 3.64E-03 2/22/2018 < 3.45E-03 (MDA) 8.43E-03 +/- 3.69E-03 3/1/2018 < 3.39E-03 (MDA) 7.95E-03 +/- 3.60E-03 3/8/2018 < 3.37E-03 (MDA) 5.79E-03 +/- 3.27E-03 3/15/2018 < 3.33E-03 (MDA) 7.10E-03 +/- 3.42E-03 3/22/2018 < 3.54E-03 (MDA) 5.74E-03 +/- 3.39E-03 3/29/2018 2.38E-03 +/- 1.88E-03 1.98E-02 +/- 4.92E-03 4/5/2018 < 3.29E-03 (MDA) 1.07E-02 +/- 3.86E-03 4/12/2018 2.94E-03 +/- 2.09E-03 1.08E-02 +/- 3.88E-03 4/19/2018 < 1.93E-03 (MDA) 1.72E-02 +/- 4.64E-03 4/26/2018 < 3.17E-03 (MDA) 1.10E-02 +/- 3.80E-03 5/3/2018 < 3.45E-03 (MDA) 1.59E-02 +/- 4.59E-03

< 3.03E-03 < 2.52E-03 5/10/2018 < 3.19E-03 (MDA) 5.92E-03 +/- 3.14E-03 (MDA) (MDA) 5/17/2018 < 3.41E-03 (MDA) 1.47E-02 +/- 4.41E-03 5/24/2018 < 3.29E-03 (MDA) 8.92E-03 +/- 3.63E-03 5/31/2018 < 3.30E-03 (MDA) 9.29E-03 +/- 3.69E-03 6/7/2018 < 3.26E-03 (MDA) 1.02E-02 +/- 3.79E-03 6/14/2018 < 3.37E-03 (MDA) 9.50E-03 +/- 3.77E-03 6/21/2018 < 3.82E-03 (MDA) 1.16E-02 +/- 4.37E-03 6/27/2018 2.79E-03 +/- 2.20E-03 8.96E-03 +/- 4.11E-03 7/3/2018 < 2.86E-03 (MDA) 7.76E-03 +/- 3.16E-03 7/11/2018 < 3.35E-03 (MDA) 4.45E-03 +/- 3.04E-03 7/18/2018 < 3.30E-03 (MDA) 5.79E-03 +/- 3.20E-03 7/25/2018 < 3.23E-03 (MDA) < 5.59E-03 (MDA) 8/1/2018 < 3.37E-03 (MDA) 9.14E-03 +/- 3.72E-03 8/8/2018 < 3.28E-03 (MDA) 8.90E-03 +/- 3.62E-03 < 2.35E-03 < 2.33E-03 8/15/2018 < 3.31E-03 (MDA) 9.34E-03 +/- 3.70E-03 (MDA) (MDA) 8/22/2018 < 3.52E-03 (MDA) 3.50E-03 +/- 3.03E-03 8/29/2018 < 3.43E-03 (MDA) 8.71E-03 +/- 3.71E-03 9/5/2018 < 3.34E-03 (MDA) 9.07E-03 +/- 3.69E-03 9/12/2018 < 3.32E-03 (MDA) 1.50E-02 +/- 4.39E-03 9/19/2018 2.40E-03 +/- 1.90E-03 2.02E-02 +/- 4.97E-03 9/26/2018 < 3.49E-03 (MDA) 1.68E-02 +/- 4.69E-03 10/3/2018 < 3.48E-03 (MDA) 1.49E-02 +/- 4.48E-03 10/10/2018 < 3.32E-03 (MDA) 2.28E-02 +/- 5.17E-03 10/17/2018 < 3.47E-03 (MDA) 3.67E-02 +/- 6.43E-03 10/24/2018 < 3.44E-03 (MDA) 1.23E-02 +/- 4.15E-03 10/31/2018 3.71E-03 +/- 2.42E-03 1.08E-02 +/- 4.06E-03 11/7/2018 2.93E-03 +/- 2.09E-03 3.19E-02 +/- 5.90E-03

< 2.58E-03 < 1.64E-03 11/14/2018 4.27E-03 +/- 2.57E-03 4.37E-02 +/- 6.93E-03 (MDA) (MDA) 11/21/2018 < 3.36E-03 (MDA) < 5.81E-03 (MDA) 11/28/2018 < 3.52E-03 (MDA) 8.94E-03 +/- 3.81E-03 12/5/2018 < 3.27E-03 (MDA) 1.65E-02 +/- 4.52E-03 12/12/2018 < 3.51E-03 (MDA) 5.29E-03 +/- 3.29E-03 12/19/2018 < 3.44E-03 (MDA) 5.54E-03 +/- 3.28E-03 12/26/2018 2.39E-03 +/- 1.89E-03 8.28E-03 +/- 3.62E-03 Table C-4 (Continued)

ODCM REQUIRED AIR SAMPLES: OIL WATER SEPARATOR (AM5)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 2.41E-03 +/- 1.90E-03 1.26E-02 +/- 4.19E-03 1/4/2018 < 3.45E-03 (MDA) 7.36E-03 +/- 3.55E-03 1/11/2018 < 3.40E-03 (MDA) 1.01E-02 +/- 3.87E-03 1/18/2018 < 3.37E-03 (MDA) 8.23E-03 +/- 3.60E-03 1/25/2018 < 3.43E-03 (MDA) 6.62E-03 +/- 3.44E-03 2/1/2018 < 3.39E-03 (MDA) 9.00E-03 +/- 3.74E-03

<1.31E-03 < 1.56E-03 2/8/2018 2.37E-03 +/- 1.87E-03 1.38E-02 +/- 4.28E-03 (MDA) (MDA) 2/15/2018 < 3.40E-03 (MDA) 8.31E-03 +/- 3.64E-03 2/22/2018 < 3.45E-03 (MDA) 4.15E-03 +/- 3.08E-03 3/1/2018 < 3.39E-03 (MDA) 5.84E-03 +/- 3.30E-03 3/8/2018 < 3.37E-03 (MDA) < 5.85E-03 (MDA) 3/15/2018 < 3.33E-03 (MDA) 5.73E-03 +/- 3.23E-03 3/22/2018 < 3.54E-03 (MDA) 3.90E-03 +/- 3.12E-03 3/29/2018 < 3.39E-03 (MDA) 1.84E-02 +/- 4.78E-03 4/5/2018 2.34E-03 +/- 1.85E-03 8.91E-03 +/- 3.62E-03 4/12/2018 < 3.31E-03 (MDA) 1.25E-02 +/- 4.10E-03 4/19/2018 < 1.93E-03 (MDA) 1.51E-02 +/- 4.40E-03 4/26/2018 2.25E-03 +/- 1.78E-03 1.16E-02 +/- 3.88E-03 5/3/2018 < 3.45E-03 (MDA) 1.19E-02 +/- 4.13E-03

< 2.37E-03 < 2.14E-03 5/10/2018 < 3.19E-03 (MDA) 9.66E-03 +/- 3.65E-03 (MDA) (MDA) 5/17/2018 3.62E-03 +/- 2.36E-03 1.79E-02 +/- 4.77E-03 5/24/2018 < 3.30E-03 (MDA) 7.18E-03 +/- 3.40E-03 5/31/2018 < 3.30E-03 (MDA) 1.14E-02 +/- 3.95E-03 6/7/2018 < 3.26E-03 (MDA) 5.37E-03 +/- 3.11E-03 6/14/2018 2.40E-03 +/- 1.89E-03 8.07E-03 +/- 3.57E-03 6/21/2018 < 3.82E-03 (MDA)14 8.72E-03 +/- 4.01E-0314 Table C-4 (Continued)

ODCM REQUIRED AIR SAMPLES: HUMBOLDT HILL (STATION 3)

Sample Alpha Activity Beta Activity Composite Gamma Start Date (pCi/m3) (pCi/m3) Activity (pCi/m3)

Co-60 Cs-137 12/28/2017 < 3.46E-03 (MDA) 1.74E-02 +/- 4.74E-03 1/4/2018 < 3.40E-03 (MDA) 7.26E-03 +/- 3.50E-03 1/11/2018 < 3.97E-03 (MDA) 9.29E-03 +/- 4.20E-03 1/18/2018 < 2.95E-03 (MDA) 2.94E-03 +/- 2.55E-03 1/25/2018 < 3.40E-03 (MDA) 6.91E-03 +/- 3.46E-03 2/1/2018 < 3.40E-03 (MDA) 6.21E-03 +/- 3.36E-03

<1.27E-03 < 1.11E-03 2/8/2018 < 3.40E-03 (MDA) 1.04E-02 +/- 3.92E-03 (MDA) (MDA) 2/15/2018 < 3.38E-03 (MDA) 6.16E-03 +/- 3.33E-03 2/22/2018 < 3.41E-03 (MDA) 5.16E-03 +/- 3.21E-03 3/1/2018 < 3.33E-03 (MDA) < 5.78E-03 (MDA) 3/8/2018 < 3.40E-03 (MDA) 8.67E-03 +/- 3.69E-03 3/15/2018 < 3.40E-03 (MDA) 3.74E-03 +/- 2.99E-03 3/22/2018 < 3.39E-03 (MDA) < 5.90E-03 (MDA) 3/29/2018 < 3.41E-03 (MDA) 7.98E-03 +/- 3.61E-03 4/5/2018 < 3.28E-03 (MDA) 1.14E-02 +/- 3.94E-03 4/12/2018 < 3.30E-03 (MDA) 8.25E-03 +/- 3.55E-03 4/19/2018 < 1.93E-03 (MDA) 1.62E-02 +/- 4.52E-03 4/26/2018 < 3.29E-03 (MDA) 3.31E-03 +/- 2.80E-03 5/3/2018 < 3.31E-03 (MDA) 8.27E-03 +/- 3.56E-03

< 3.04E-03 < 1.66E-03 5/10/2018 < 3.32E-03 (MDA) < 5.75E-03 (MDA)

(MDA) (MDA) 5/17/2018 < 3.30E-03 (MDA) 1.07E-02 +/- 3.86E-03 5/24/2018 < 3.33E-03 (MDA) 1.01E-02 +/- 3.81E-03 5/31/2018 < 3.28E-03 (MDA) 7.14E-03 +/- 3.38E-03 6/7/2018 < 3.31E-03 (MDA) < 5.73E-03 (MDA) 6/14/2018 < 3.31E-03 (MDA) 7.20E-03 +/- 3.41E-03 6/21/2018 < 3.90E-03 (MDA) 1.06E-02 +/- 4.30E-03 6/27/2018 < 3.96E-03 (MDA) 5.25E-03 +/- 3.58E-03 7/3/2018 < 2.80E-03 (MDA) 7.00E-03 +/- 3.02E-03 7/11/2018 < 3.32E-03 (MDA) 4.41E-03 +/- 3.01E-03 7/18/2018 < 3.31E-03 (MDA) 5.09E-03 +/- 3.10E-03 7/25/2018 < 3.31E-03 (MDA) < 5.73E-03 (MDA) 8/1/2018 < 3.31E-03 (MDA) < 5.73E-03 (MDA) 8/8/2018 < 3.30E-03 (MDA) < 5.71E-03 (MDA) < 3.00E-03 < 1.64E-03 8/15/2018 3.52E-03 +/- 2.29E-03 9.33E-03 +/- 3.70E-03 (MDA) (MDA) 8/22/2018 < 3.47E-03 (MDA) 6.32E-03 +/- 3.42E-03 8/29/2018 < 3.51E-03 (MDA) < 6.07E-03 (MDA) 9/5/2018 < 3.27E-03 (MDA) 9.57E-03 +/- 3.71E-03 9/12/2018 < 3.31E-03 (MDA) 1.07E-02 +/- 3.88E-03 9/19/2018 < 3.47E-03 (MDA) 1.46E-02 +/- 4.44E-03 9/26/2018 < 3.47E-03 (MDA) 1.88E-02 +/- 4.88E-03 10/3/2018 < 3.46E-03 (MDA) 1.06E-02 +/- 3.98E-03 10/10/2018 < 3.32E-03 (MDA) 1.78E-02 +/- 4.68E-03 10/17/2018 3.05E-03 +/- 2.17E-03 2.21E-02 +/- 5.19E-03 10/24/2018 < 3.47E-03 (MDA) 4.89E-03 +/- 3.21E-03 10/31/2018 < 3.47E-03 (MDA) 6.68E-03 +/- 3.47E-03 11/7/2018 3.05E-03 +/- 2.18E-03 1.89E-02 +/- 4.89E-03

< 2.58E-03 < 2.80E-03 11/14/2018 5.47E-03 +/- 2.93E-03 4.28E-02 +/- 6.86E-03 (MDA) (MDA) 11/21/2018 < 3.30E-03 (MDA) 7.18E-03 +/- 3.41E-03 11/28/2018 < 3.48E-03 (MDA) 8.50E-03 +/- 3.72E-03 12/5/2018 < 3.28E-03 (MDA) 1.27E-02 +/- 4.08E-03 12/12/2018 < 3.51E-03 (MDA) 5.30E-03 +/- 3.29E-03 12/19/2018 < 3.52E-03 (MDA) 6.04E-03 +/- 3.41E-03 12/26/2018 < 3.37E-03 (MDA) 5.43E-03 +/- 3.21E-03 Table C-4 Notes

1. The AM2 air sampler formerly adjacent to Building 12 was found to be not operating on January 4, 2018, due to a tripped GFCI. The air sampler SAPN 1438309.

2. The AM3 air sampler adjacent to the Annex was turned off for 2.5 hours5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months on January 13, 2018, due to a planned power outage for electrical maintenance activities. Actions documented in SAPN 1438739.

3. The East Fence air sampler (AM1) was powered down for 10 minutes on February 20, 2018, to allow relocation of the light plant that supplied power to the air sample pump. Actions documented in SAPN 1438430.

4. The East Fence air sampler (AM1) was powered off for approximately 20 minutes on February 26, 2018, due to electrical maintenance activities.

Actions documented in SAPN 1438430.

5. The East Fence air sampler (AM1) was reported as not operating on April 3, 2018. The sample pump was changed out on April 4, 2018, and the totalizer reading was used to determine sample volume. During the time the sample pump was not running, there were no field activities that could have caused an airborne event. Actions documented in SAPN 1441219.

6. The GWTS air sampler (AM2) was discovered to be out of service due to a tripped breaker on April 9, 2018. Actions documented in SAPN 1441521.

7. AM2 was relocated to a corner of the GWTS 2.0 area on April 12, 2018, primarily due to electrical power supply issues. The down time for the filter was adequately documented in SAPN 1438430.

8. The East Fence air sampler (AM1) was shut down on April 25, 2018, to relocate the generator which powered the sampler. Actions documented in SAPN 1438430.

9. The East Fence air sampler (AM1) was found to be not operating on April 26, 2018, due to a tripped GFCI. The sampler was later shut down for approximately 10 minutes to switch generators. Actions documented in S1441799.

10. The East Fence air sampler (AM1) was found to be not operating on May 7, 2018. The sampler was restarted, and totalizer readings were used to determine sample volume. Actions documented in SAPN 1442270.

11. The East Fence air sampler (AM1) was found to be not running on May 18, 2018, most likely due to the generator tripping off line. Actions documented in SAPN 1442601.

12. The East Fence air sampler (AM1) was found to be not running on June 4, 2018. Actions documented in SAPN 1443150.

13. The East Fence air sampler (AM1) was relocated to the HBGS fence line on June 7, 2018. An extension cord from HBGS was used to power the sample pump. The air sampler was turned off during the relocation.

Actions documented in SAPN 1438430.

Table C-4 Notes, continued

14. The O.W.S air sampler (AM5) located at the former location of the oily water separator was permanent powered down on June 27, 2018. The location had been deleted from the ODCM and the air sampler was no longer required. Actions documented in SAPN 1438430.

15. HBGS initiated a clearance on the power source of the East Fence air sampler (AM1) on July 3, 2018. The clearance was scheduled for several days. The decision was made not to attempt to power the air sampler by generator from July 3, 2018 to July 10, 2018. Because no work was planned during the time interval (site was shut down for the holiday week),

the air sampler was not required to be run during nonbusiness hours.

Actions documented in SAPN 1444106.

16. Due to a site wide electrical outage of approximately 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months on July 23, 2018, and problems encountered following the power outage, the Annex air sampler (AM3) and GWTS air sampler (AM2) could not immediately be returned to service. AM3 was returned to service on July 24, 2018, while AM2 was returned to service on July 26, 2018. Actions documented in SAPN 1444412.

17. On July 31, 2018, the Annex air sampler (AM3) was found to be unplugged with a totalizer run time of approximately 50 hours5.787037e-4 days 0.0139 hours 8.267196e-5 weeks 1.9025e-5 months and 55 minutes. It appeared a worker may have tripped over the electrical extension cord, causing it to suffer a loss of power. The sampler was restarted and the totalizer reading used to determine the sample volume. Actions documented in SAPN 1444804.

18. The Annex air sampler (AM3) was without power for approximately 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months on August 7, 2018, due to a planned electrical outage. The GWTS 2.0 air sampler (AM2) was without power for approximately 30 minutes on August 8, 2018 due to a planned electrical outage. Actions documented in SAPN 1438430.

19. The Annex air sampler (AM3) lost power sometime around December 11, 2018. Actions documented in SAPN 1438430.

FIGURE A-1 HBPP ONSITE AIR SAMPLE LOCATIONS Location GPS Coordinates (NAD83/NAVD88 CA. Zone 1 Number Easting* Northing*

East Fence 5949844 2161231 AM1 GWTS 5949272 2161330 AM2 Annex Bldg.

5949178 2160817 AM3 Relay Bldg.

5949456 2160858 AM4 Figure A-1 Note:

1. Humboldt Hill (Offsite) is also known as Station 3, East Fence is also known as AM1, GWTS (formerly Building 12) is also known as AM2, Annex is also known as AM3, and the Relay Building is also known as AM4.

FIGURE A-2 HBPP OFFSITE AIR SAMPLE LOCATION HUMBOLDT HILL (Station 3)

Offsite Air Sampler Station 3 n

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11**~~-*.

~ /I ..

GPS Coordinates (NAD83/NAVD88 CA. Zone 1) Dearee.Decimal Eastina Northing el. Latitude Longitude 5951260.28 2155706.11 234.94 40.72676 -1 24.20274 FIGURE A-3 HBPP ONSITE TLD LOCATIONS Stations T1 - T16 (excluding T17)

Cu RREN1 SITE PLAN DECEMBER 5, 201 s T-8 T-7 T-6 T-5 T-9 T-4 T-10 T-11 T-3 T-2 T-1 T-12 T-16 T-14 T-13 T-15 Monitoring Locations T7, T10, T11, T13, T16, T2, T3, and T5 generally represent REMP Site Boundary direct exposure monitoring locations in the 8 primary compass points beginning with T7 representing north and moving clockwise.

Location GPS Coordinates Number (NAD83/NAVD88 CA Zone 1)

Easting Northing Elevation T1 5949179 2160815 11 T2 5948794 2160911 17 T3 5948610 2161062 42 T4 5948779 2161270 44 T5 5949003 2161368 38 T6 5949160 2161437 36 T7 5949280 2161495 32 T8 5949147 2161564 21 T9 5949478 2161241 23 T10 5949519 2161199 19 T11 5949772 2161202 13 T12 5950019 2160858 11 T13 5949842 2160718 10 T14 5949584 2160684 10 T15 5949473 2160590 11 T16 5949327 2160771 11 FIGURE A-4 HBPP OFFSITE TLD LOCATIONS Stations (1, 14 & 25)

I GP S Coordinates (NAD83/NAV D88 CA. Zone 1) Degree. Decimal Q) Easting I Northing el. Latilude Longitude 1 5948026.52 I 2161183.79 11.38 40. 74156 -124.21903 14 5949876.83 I 2158864.39 18.65 40.73533 -124.20802 25 5950247.30 I 2154214.18 229.22

40.72260 -124.20626 FIGURE A-4 (Continued)

HBPP OFFSITE TLD LOCATION FORTUNA (Station 2) r,..~...,,.." ,

N~:'*"!*

,t * ,,*:*

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2

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11

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r GPS Coordinates (NAD83/NAV.D88 CA. Zone 1) Degree.Decimal Easting I Northina I el. Latitude I Longitude 5962583.86 I 2105797.82 I 35.53 40.59057 1 * -124.1 5746 FIGURE A-4 (Continued)

HBPP OFFSITE TLD LOCATION EUREKA (Control Location T17)

,* *. l

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GPS Coord[nates (NADS3/NAVD88 CA. Zone 1) Degree. Decimal Easting I

Northing I el. Latitude I Longitude 5976549 .55 ! 2175490.19 l 164.85 40.78276 I -124.11324 FIGURE B-1 OFFSITE ENVIRONMENTAL RADIATION LEVEL TRENDS 80.0 70.0 I

,,\

I \

60.0 I \

50.0 Dose - mRem/yr 40.0 30.0 King Salmon Picnic Area (Station 1)

Fortuna (Station 2) 20.0 South Bay School (Station 14)

Humboldt Hill (Station 25) 10.0 Myrtletown Substation (Station T17) 0.0 Year The baseline values for each location were obtained by averaging the readings at each location from 1977 through 1983. However, these values were obtained using ion chambers instead of TLDs. The average annual values from 1977 through 1983 were Station 1 - 83.0 mRem, Station 2 - 79.8 mRem, Station 14 - 80.2 mRem, and Station 25 -

73.7 mRem.

FIGURE B-2 ONSITE ENVIRONMENTAL RADIATION LEVEL TRENDS 80.0 70.0 60.0 I I

I, ~

50.0 '

'--*-..--.. , J Dose - mRem/yr 40.0 30.0

-~- Stations Near Radwaste Activities (T5-T8), 1989-2015 20.0 Other Onsite Stations (T1-T4, T9-T16), 1989-2015 Radwaste Handling (T8-T10), 2016-2018 10.0 Other Onsite Stations (T1-T7, T11-T16), 2016-2018 0.0 Year The baseline values for the two areas were obtained by averaging the readings for each area from 1977 through 1983. However, these values were obtained using ion chambers instead of TLDs. The average annual value from 1977 through 1983 for the stations near the radwaste activities was 78.6 mRem and the average annual value for other onsite stations was 79.4 mRem.

HBL-19-010, Annual Radiological Environmental Monitoring Report for 2018

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HBL-19-010, Annual Radiological Environmental Monitoring Report for 2018

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Dear Commissioners and Staff:

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