DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 5, GEO.DCPP.TR.14.04 R0 App A-G Figures 08-06-14

Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 5, GEO.DCPP.TR.14.04 R0 App A-G Figures 08-06-14

ML14260A043
Person / Time
Site:	Diablo Canyon
Issue date:	09/10/2014
From:	Pacific Gas & Electric Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML14260A106	List: DCL-14-081, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 8, Fugro.PGEQ-PR-21 R0 Figures Incl App a 07-31-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 1, Introduction DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 1, Introduction, Figures DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 10, Fugro.PGEQ-PR-16 R1 Figures Incl App A-B 08-05-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 10, Fugro.PGEQ-PR-16 R1 Txt.W.Itr DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 11, GEO.DCPP.TR.14.06 R0 Figures 08-10-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 11, GEO.DCPP.TR.14.06 R0.Txt.w.ITR DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 12, GEO.DCPP.TR.14.07 R0 Figures 08-01-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 12, GEO.DCPP.TR.14.07 R0.Txt.w.ITRs DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 13, GEO.DCPP.TR.14.08 R0 Figures 08-10-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 13, GEO.DCPP.TR.14.08 R0.Txt.w.ITR DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 14, Findings and Conclusions DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 2, GEO.DCPP.TR.12.01 R1 App a DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 2, GEO.DCPP.TR.12.01 R1 Figures 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 2, GEO.DCPP.TR.12.01 R1 Plates 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 2, GEO.DCPP.TR.12.01 R1 Txt.W.Itr DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 3, GEO.DCPP.TR.14.02 R0 App a Figures 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 3, GEO.DCPP.TR.14.02 R0 Figures 09-02-14 Compressed DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 3, GEO.DCPP.TR.14.02 R0 Plates 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 3, GEO.DCPP.TR.14.02 R0 Txt.W.Itr DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 4, Ch4.GEO.DCPP.TR.14.05 R0 Plates 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 4, GEO.DCPP.TR.14.05 R0 Figures 09-02-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 4, GEO.DCPP.TR.14.05 R0 Txt.W.Itr DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 5, GEO.DCPP.TR.14.04 R0 App A-G Figures 08-06-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 5, GEO.DCPP.TR.14.04 R0 Figures 09-03-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 5, GEO.DCPP.TR.14.04 R0.Txt.w.ITR DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 6, Appendix a DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 6, Hess Hosgri DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 6, Hess Hosgri Report Figures 08-05-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 7, GEO.DCPP.TR.14.03 R0 Figures 09-05-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 7, GEO.DCPP.TR.14.03 R0 Plates 08-06-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 7, GEO.DCPP.TR.14.03.Txt.w.ITR DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 8, Fugro.PGEQ-PR-21 R0 Txt.W.Itr DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 9, GEO.DCPP.TR.14.01 R0 App A-E Figures 07-31-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 9, GEO.DCPP.TR.14.01 R0 App E Plates 07-31-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 9, GEO.DCPP.TR.14.01 R0 Figures 07-31-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 9, GEO.DCPP.TR.14.01 R0 Plates 07-31-14 DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Chapter 9, GEO.DCPP.TR.14.01 R0.Text.w.ITR DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Executive Summary DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Table of Contents DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project (Cccsip) Technical Summary DCL-14-081, Diablo Canyon Units 1 and 2, Central Coastal California Seismic Imaging Project, Shoreline Fault Commitment ML14260A024 ML14260A025 ML14260A026 ML14260A027 ML14260A028 ML14260A030 ML14260A033 ML14260A034 ... further results
References
DCL-14-081
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Text

Page 1 of 8 GEO.DCPP.TR.14.04 R0 Appendix A

Page 2 of 8 GEO.DCPP.TR.14.04 R0 Appendix A Dr. Felix Waldhauser performed various sensitivity tests using synthetic earthquake locations to find the optimal OBS locations that also fit the permitting requirements. Waldhauser's analysis method and selected results are shown at the end of his email 'train".

He felt that synthetic tests Syn04.2 and Syn05.2 were considered good array designs that would meet our objectives. The Syn04 design would probably record and locate very small events on the shoreline fault right off-shore DC (Figure 1). The Syn05 design would be optimized to best constrain events towards the fault intersection, and produce better network criteria for events on the Hosgri fault (Figure 2). However, due to the constraints set by the permitting agencies, designs Syn04.2 and Syn05.2 had to be modified. The results labeled syn07.2_20km and syn07.2_55km are the preferred OBS locations (Figure 3). Figure 4 shows the final locations and corresponding errors from HYPOINVERSE for synthetic events recorded at stations within 20 km (top) and 55 km (bottom).

These final results were used to write the request for proposal. Details of these tests are described in the emails below.

From:

Subject:

Re: synthetics setup Date: To: Cc:

Page 3 of 8 GEO.DCPP.TR.14.04 R0 Appendix A

From:

Subject:

Re: Best spots?

Date: To: Cc:

Page 4 of 8 GEO.DCPP.TR.14.04 R0 Appendix A

From:

Subject:

Re: Best spots? + need final SFZ analysisreport Date: To: Cc:

Page 5 of 8 GEO.DCPP.TR.14.04 R0 Appendix A Figure 1. Synthetic test 04.2 showing network criteria needed for this design (red and yellow criteria described in emails above) for maximum stations distances of 20 km (top) and 55 km (bottom). Onshore OBS and onshore stations are represented by blue squares.

Page 6 of 8 GEO.DCPP.TR.14.04 R0 Appendix A Figure 2. Synthetic test 05.2 showing network criteria needed for this design (red and yellow criteria described in emails above) for maximum stations distances of 20 km (top) and 55 km (bottom). Onshore OBS and onshore stations are represented by blue squares.

Page 7 of 8 GEO.DCPP.TR.14.04 R0 Appendix A Figure 3. Preferred results. Synthetic test 0 7.2 showing network criteria needed for this design (red and yellow criteria described in emails above) for maximum stations distances of 20 km (top) and 55 km (bottom). Onshore OBS and onshore stations are represented by blue squares.

Page 8 of 8 GEO.DCPP.TR.14.04 R0 Appendix A Figure 4. Locations and corresponding errors from HYPOINVERSE for synthetic events recorded at stations within 20 km (top) and 55 km (bottom). Size of '+' represents lateral errors; vertical errors are color coded. Onshore OBS and onshore stations are represented by blue squares.

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369 Pacific Street San Luis Obispo, California 93401 805-786-2650 Fax 805-786-2651

INTRODUCTION

METHODS AND EQUIPMENT

NEARSHORE OBSERVATIONS

OFFSHORE OBSERVATIONS -80 FT ISOBATH TO OBS-4.

OBS-4 TO OBS-3.

OBS-3 TO OBS-2 AND TEMPORARY OBS-2.

OBS-2 TO OBS-1 AND TEMPORARY OBS-1.

ASSESSMENT OF IMPACTS

ATTACHMENT A FIGURES Figure 1. Region and Site Seafloor Habitats with Installed OBS and Cable Locations Figure 2. Installed OBS and Cable Locations with Marine Protected Area Figure 3. OBS and Cable As Laid Location with NOAA Nautical Chart Figure 4. Video-Still of OBS-4 with Deployment Bridle (Water Depth 174 ft. [53 m]) Figure 5. Video-Still of Cable Crossing Rock Feature and Suspended Between Rock Features (Water Depth 175 ft. [53 m])

Figure 6. Video-Still of OBS-3 and Installation Bridle (Water Depth 340 ft. [104 m]) Figure 7. Video-Still of Junction Box Between OBS Units 4 and 3 (Water Depth 252 ft. [77m])

Figure 8. Video-Still of OBS-2 and Installation Bridle (Water Depth 330 ft. [101 m]) Figure 9. Video-Still of OBS-1 and Installation Bridle (Water Depth 210 ft. [64 m])

Diablo Canyon Power Plant OBS Cable Post

-Deployment Diver Survey November 14, 2013 Prepared for:

Prepared by:

Ms. Marcia McLaren Tenera Environmental Purpose This report describes the post-deployment survey findings for the nearshore section of the Diablo Canyon Power Plant (DCPP) Ocean Bottom Seismometer (OBS) cable. The nearshore section of the cable starts at the -80 ft (-24 m) MLLW depth contour outside the DCPP intake cove and passes through the intake cove to where it rises up the intertidal revetment through a conduit on the northeast shore of the intake cove (Figure 1). From there the cable passes under a road and terminates inside the data processing lab. The nearshore section was surveyed by divers using SCUBA because the shallow area cannot be surveyed by remote operated vehicles (ROVs), due to the presence of kelp and rock pinnacles that can tangle the ROV tether and cable. The divers collected latitude/longitude coordinates of the as-built nearshore cable alignment, and completed underwater videography to document the habitats and species along the cable. A GIS shapefile with the coordinates of the cable alignment and the video are provided as additional deliverables. Prior to the cable deployment, the habitats and predominant benthic species along the planned cable route of the nearshore section were documented in surveys completed by Tenera divers on May 17-20, 2011.

1 The nearshore section of the OBS cable was subsequently deployed through the intake cove on July 26, 2013. Tenera divers assisted with deploying and positioning portions of the nearshore cable section to its final (as-built) alignment. The post-deployment survey of the nearshore cable section was then completed on October 16, 2013. The following sections of the present report describe the survey methods and findings.

1 Tenera Environmental.

2011. Ocean Bottom Seismometer Cable Landing, Habitat Characterization Study, Diablo Canyon Power Plant, May 27, 2011.

Methods The OBS cable post-deployment survey of the nearshore section was completed on October 16, 2013. Seas were calm with 1-2 ft (0.3-0.6 m) swell, and winds were light. Underwater horizontal visibility was approximately 20 ft (6 m). The survey began at a starting depth of approximately -76 ft (-23 m) MLLW, which was approximately 230 ft (70 m) further offshore from the outermost location of the pre-deployment survey. From there the survey progressed inshore (Figure 1). The submerged cable was videotaped using a Sony Handycam Model HDR-CX550V digital video camera inside a Light and Motion Bluefin 550 waterproof housing. At the same time, the divers towed a Garmin ETrex Legend GPS unit attached to a surface float with the tether line held taught to keep the GPS unit directly above the divers. This provided a trackline of latitude/longitude coordinates for the Figure 1. OBS cable nearshore section through the DCPP intake cove showing the as-built alignment (green) and planned alignment (red) and divided into three segments based on substrate habitat s crossed. Running times of the video camera are shown for every 4-minutes.

nearshore cable section (Figure 1). The GPS unit was set to record at 3-second intervals. The GPS and camera times were synchronized by correcting for the time offset between the two units (by videotaping the time display of the GPS unit). This allowed the video images to be synced with their locations along the cable route. Results and Discussion The total cable distance surveyed from the -76 ft (2 3 m) MLLW depth outside the intake cove to the intertidal reve tment at the shoreline was approximately 1,837 ft (560 m). The total run time of the underwater video was 39 minutes 46 seconds. The divers were able to survey this entire distance in a single dive, and thus the videotaping and position recordings ran continuously and were never interrupted. The as-built OBS cable alignment of the nearshore section determined by towing a surface GPS unit over the cable appears in Figure 1. The actual alignment, however, is likely 'smoother' than the line shown in Figure 1, due to the GPS unit not being able to be kept directly above the video divers at all times. It was difficult to keep the GPS unit directly above the video divers when they were in deep water, in the intake cove entrance area where currents were strong, and where surface canopy kelp and drift kelp became tangled with the GPS tether line. Overall, the as-built cable alignmen t of the nearshore section closely matches the planned alignment (Figure 1); the cable passes through the same general zones described in the pre-deployment survey that were differentiated based on habitat and species characteristics. The underwater video reveals the as

-built cable laying across three types of substrate habitats

an expansive sand flat mainly outside the intake cove; areas of mixed substrates (bedrock, boulder, cobble, gravel, sand) inside the intake cove; and areas of mainly bedrock and boulders where the cable approaches the intertidal revetment and comes to shore (Figure 1 , Table 1). Table 1. Approximate lengths (m) of the nearshore OBS cable crossing over three types of substrates.

Segment Video Run Time Depth Range Sand Flat Mixed Substrates Rocky Comments

The cable lengths associated with the substrate habitats in Table 1 are approximate, and would be expected to change seasonally due to sand accretion and attrition associated with natural sediment transport in the area. There were no indications of habitats or biota having been impacted from the cable installation. The cable was deployed very close to the planned route, and there were no observations of overturned rocks, damaged kelp, or injured or dislodged invertebrates, which would indicate potential impacts due to the deployment of the cable. Furthermore, the divers shifted the alignment of the cable in areas where movement may have resulted in impacts. The cable is small in diameter (approximately 0.5 in. [1.3 cm]), and was already settling and becoming buried under sand in many areas. It had been 73 days since the time the cable was deployed. Representative video images of the nearshore cable section follow.

Segment 1 at 00:00 run time. Diver is holding the tether of the GPS unit that is directly above.

Segment 1 at 00:07 run time showing cable passing next to rock covered with bat stars.

Segment 1 at 00:40 run time with cable buried under sand with tie-wrap protruding.

Segment 1 at 07:20 run time with cable over sand.

Segment 2 at 16:27 run time with subcanopy kelps attached to rocks next to cable.

Segment 2 at 20:46 run time with cable settling between mats of ornate tube worms.

Segment 2 at 20:59 run time.

Segment 2 at 27:41 run time.

Segment 2 at 29:30 run time with cable crossing over a sand pocket area. Segment 2 at 32:24 run time.

Segment 2 at 32:32 run time with cable on heavily silted boulder.

Segment 2 at 33:56 run time Segment 3 at 3 8: 50 run time. Segment 3 at 39:38 run time with cable in conduit running up shore revetment.

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