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Category:Environmental Monitoring Report
MONTHYEARML24003A7212023-11-27027 November 2023 Independent Safety Committee; Diablo Canyon Nuclear Power Plant Operations, Thirty-Third Annual Report on the Safety July 1, 2022-June 30, 2023 DCL-2023-520, Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP)2023-10-19019 October 2023 Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP) DCL-23-034, 2022 Annual Nonradiological Environmental Operating Report2023-05-0101 May 2023 2022 Annual Nonradiological Environmental Operating Report DCL-2023-511, Report on Discharge Monitoring for the First Quarter of 20232023-04-20020 April 2023 Report on Discharge Monitoring for the First Quarter of 2023 ML23137A1352023-04-18018 April 2023 NPDES Receiving Water Monitoring Program 2022 Annual Report ML23052A1152023-02-18018 February 2023 Independent Spent Fuel Storage Installation, Annual Radioactive Effluent Release Report for 2022 DCL-2023-503, Annual Sea Turtle Report2023-01-26026 January 2023 Annual Sea Turtle Report DCL-2023-502, (DCPP) 4th Quarter 2022 Report on Discharge Self-Monitoring2023-01-18018 January 2023 (DCPP) 4th Quarter 2022 Report on Discharge Self-Monitoring DCL-22-032, 2021 Annual Nonradiological Environmental Operating Report2022-04-27027 April 2022 2021 Annual Nonradiological Environmental Operating Report DCL-22-033, Annual Report of Occupational Radiation Exposure for 20212022-04-26026 April 2022 Annual Report of Occupational Radiation Exposure for 2021 DCL-22-017, Submittal of 2021 Annual Radioactive Effluent Release Report2022-04-21021 April 2022 Submittal of 2021 Annual Radioactive Effluent Release Report DCL-22-025, 2021 Annual Radiological Environmental Operating Report2022-04-21021 April 2022 2021 Annual Radiological Environmental Operating Report DCL-21-037, Annual Nonradiological Environmental Operating Report2021-04-28028 April 2021 Annual Nonradiological Environmental Operating Report DCL-2021-514, NPDES Receiving Water Monitoring Program: 2020 Annual Report2021-04-27027 April 2021 NPDES Receiving Water Monitoring Program: 2020 Annual Report DCL-21-022, 2020 Annual Radiological Environmental Operating Report2021-04-0101 April 2021 2020 Annual Radiological Environmental Operating Report L-21-003, Independent Spent Fuel Storage Installation - Annual Radioactive Effluent Release Report for 20202021-03-0101 March 2021 Independent Spent Fuel Storage Installation - Annual Radioactive Effluent Release Report for 2020 DCL-20-036, 2019 Annual Non-Radiological Environment Operating Report2020-04-29029 April 2020 2019 Annual Non-Radiological Environment Operating Report DCL-20-010, 2019 Annual Radiological Environmental Operating Report2020-04-16016 April 2020 2019 Annual Radiological Environmental Operating Report L-20-003, Independent Spent Fuel Storage Installation - Annual Radioactive Effluent Release Report for 20192020-03-0202 March 2020 Independent Spent Fuel Storage Installation - Annual Radioactive Effluent Release Report for 2019 DCL-2020-509, 2019 Annual Report on Discharge Self-Monitoring2020-02-27027 February 2020 2019 Annual Report on Discharge Self-Monitoring DCL-19-026, Annual Radioactive Effluent Release Report2019-04-23023 April 2019 Annual Radioactive Effluent Release Report DCL-18-028, Submittal of 2017 Annual Radioactive Effluent Release Report2018-04-24024 April 2018 Submittal of 2017 Annual Radioactive Effluent Release Report DCL-17-034, 2016 Annual Non-Radiological Environmental Operating Report2017-04-27027 April 2017 2016 Annual Non-Radiological Environmental Operating Report DCL-17-031, Transmittal of 2016 Annual Radioactive Effluent Release Report2017-04-26026 April 2017 Transmittal of 2016 Annual Radioactive Effluent Release Report DCL-17-030, Diablo Canyon Units 1 and 2, Submittal of 2016 Annual Radiological Environmental Operating Report2017-04-26026 April 2017 Diablo Canyon Units 1 and 2, Submittal of 2016 Annual Radiological Environmental Operating Report ML17128A0242017-04-26026 April 2017 Submittal of 2016 Annual Radiological Environmental Operating Report ML17096A7662017-04-0606 April 2017 Submittal of Mitigating Strategies Assessment for Flooding Report DCL-17-030, 2016 Annual Quality Assurance Report for the Radiological Environmental Monitoring Program (REMP)2017-03-29029 March 2017 2016 Annual Quality Assurance Report for the Radiological Environmental Monitoring Program (REMP) DCL-2017-511, Submittal of 2016 Annual Discharge Self-Monitoring Report2017-02-28028 February 2017 Submittal of 2016 Annual Discharge Self-Monitoring Report DCL-2017-501, Diablo Power Plant - 2016 Annual Sea Turtle Report2017-01-27027 January 2017 Diablo Power Plant - 2016 Annual Sea Turtle Report DCL-2017-500, Discharge Monitoring Report for Fourth Quarter 20162017-01-20020 January 2017 Discharge Monitoring Report for Fourth Quarter 2016 DCL-16-113, Corrections to the 2014 and 2015 Annual Radioactive Effluent Release Reports2016-11-0101 November 2016 Corrections to the 2014 and 2015 Annual Radioactive Effluent Release Reports DCL-16-055, Transmittal of 2015 Annual Non-Radiological Environmental Operating Report2016-04-28028 April 2016 Transmittal of 2015 Annual Non-Radiological Environmental Operating Report ML16154A1652016-04-27027 April 2016 Submittal of Copies of Receiving Water Monitoring Program 2015 Annual Report DCL-16-054, Annual Radioactive Effluent Release Report for 20152016-04-27027 April 2016 Annual Radioactive Effluent Release Report for 2015 L-2016-518, Diablo Canyon Power Plant, Submittal of Copies of Receiving Water Monitoring Program 2015 Annual Report2016-04-27027 April 2016 Diablo Canyon Power Plant, Submittal of Copies of Receiving Water Monitoring Program 2015 Annual Report DCL-2016-518, NPDES Receiving Water Monitoring Program: 2015 Annual Report2016-04-25025 April 2016 NPDES Receiving Water Monitoring Program: 2015 Annual Report DCL-16-045, Submittal of 2015 Annual Radiological Environmental Operating Report2016-04-21021 April 2016 Submittal of 2015 Annual Radiological Environmental Operating Report DCL-2016-516, Transmittal of 1st Quarter 2016 Report on Discharge Self-Monitoring2016-04-20020 April 2016 Transmittal of 1st Quarter 2016 Report on Discharge Self-Monitoring DCL-15-137, Corrections to the 2014 Annual Radioactive Effluent Release Report2015-12-31031 December 2015 Corrections to the 2014 Annual Radioactive Effluent Release Report DCL-2015-540, Third Quarter 2015 Report of Discharge Self-Monitoring2015-10-20020 October 2015 Third Quarter 2015 Report of Discharge Self-Monitoring DCL-2015-532, Discharge Self-Monitoring Report for 2nd Quarter of 20152015-07-20020 July 2015 Discharge Self-Monitoring Report for 2nd Quarter of 2015 DCL-15-056, 2014 Annual Nonradiological Environmental Operating Report2015-04-29029 April 2015 2014 Annual Nonradiological Environmental Operating Report DCL-15-053, 2014 Annual Radioactive Effluent Release Report2015-04-29029 April 2015 2014 Annual Radioactive Effluent Release Report DCL-2015-523, Receiving Water Monitoring Program 2014 Annual Report2015-04-29029 April 2015 Receiving Water Monitoring Program 2014 Annual Report ML15117A6572015-04-27027 April 2015 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 3 of 5 DCL-15-046, 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 1 of 52015-04-27027 April 2015 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 1 of 5 ML15117A6562015-04-27027 April 2015 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 2 of 5 ML15117A6602015-04-27027 April 2015 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 4 of 5 ML15117A6622015-04-27027 April 2015 2014 Annual Radiological Environmental Operating Report for the Year 2014) - Part 5 of 5 2023-05-01
[Table view] Category:Letter type:DCL
MONTHYEARDCL-24-010, Nuclear Material Transaction Report for New Fuel2024-01-29029 January 2024 Nuclear Material Transaction Report for New Fuel DCL-24-009, Nuclear Material Transaction Report for New Fuel2024-01-17017 January 2024 Nuclear Material Transaction Report for New Fuel DCL-24-008, Schedule Considerations for Review of the DCPP License Renewal Application2024-01-17017 January 2024 Schedule Considerations for Review of the DCPP License Renewal Application DCL-24-004, Supplement to License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b2024-01-15015 January 2024 Supplement to License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b DCL-23-129, Nuclear Material Transaction Report for New Fuel2023-12-27027 December 2023 Nuclear Material Transaction Report for New Fuel DCL-23-122, Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation2023-12-14014 December 2023 Request for Exemption from Enhanced Weapons, Firearms Background Checks, and Security Event Notifications Implementation DCL-23-128, Emergency Plan Update2023-12-13013 December 2023 Emergency Plan Update DCL-23-125, Core Operating Limits Report for Unit 1 Cycle 252023-12-0606 December 2023 Core Operating Limits Report for Unit 1 Cycle 25 DCL-23-121, Supplement to License Amendment Request 23-03, Revision to Technical Specification3.7.8, Auxiliary Saltwater System2023-11-16016 November 2023 Supplement to License Amendment Request 23-03, Revision to Technical Specification3.7.8, Auxiliary Saltwater System DCL-23-120, License Amendment Request 23-03 Revision to Technical Specification 3.7.8, Auxiliary Saltwater (Asw) System2023-11-14014 November 2023 License Amendment Request 23-03 Revision to Technical Specification 3.7.8, Auxiliary Saltwater (Asw) System DCL-23-118, License Renewal Application2023-11-0707 November 2023 License Renewal Application DCL-2023-520, Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP)2023-10-19019 October 2023 Discharge Self-Monitoring at Diablo Canyon Power Plant (DCPP) DCL-23-103, Independent Spent Fuel Storage Installation - Withdrawal of License Amendment Request 22-01, Request for Approval of Alternative Security Measures for Early Warning System2023-10-13013 October 2023 Independent Spent Fuel Storage Installation - Withdrawal of License Amendment Request 22-01, Request for Approval of Alternative Security Measures for Early Warning System DCL-23-092, Material Status Report for the Period Ending August 31, 20232023-09-28028 September 2023 Material Status Report for the Period Ending August 31, 2023 DCL-23-077, License Amendment Request 23-02 Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors2023-09-27027 September 2023 License Amendment Request 23-02 Application to Adopt 10 CFR 50.69, Risk-Informed Categorization and Treatment of Structures, Systems and Components for Nuclear Power Reactors DCL-23-083, Upcoming Meeting with Nuclear Security and Incident Response Staff2023-09-13013 September 2023 Upcoming Meeting with Nuclear Security and Incident Response Staff DCL-23-078, Nuclear Material Transaction Report for New Fuel2023-09-0606 September 2023 Nuclear Material Transaction Report for New Fuel DCL-23-070, Withdrawal of Request Regarding Senior Reactor Operator License Application2023-08-16016 August 2023 Withdrawal of Request Regarding Senior Reactor Operator License Application DCL-23-068, Nuclear Material Transaction Report for New Fuel2023-08-0909 August 2023 Nuclear Material Transaction Report for New Fuel DCL-23-066, Nuclear Material Transaction Report for New Fuel2023-08-0303 August 2023 Nuclear Material Transaction Report for New Fuel DCL-23-065, Letter DCL-23-065 Request That Exam Material Be Withheld from Public Disclosure2023-07-27027 July 2023 Letter DCL-23-065 Request That Exam Material Be Withheld from Public Disclosure DCL-23-064, Nuclear Material Transaction Report for New Fuel2023-07-26026 July 2023 Nuclear Material Transaction Report for New Fuel DCL-23-054, License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b2023-07-13013 July 2023 License Amendment Request 23-01 Revision to Technical Specifications to Adopt Risk-Informed Completion Times TSTF-505, Revision 2, Provide Risk-Informed Extended Completion Times - RITSTF Initiative 4b DCL-23-055, Nuclear Material Transaction Report for New Fuel2023-07-0606 July 2023 Nuclear Material Transaction Report for New Fuel DCL-23-042, Independent Spent Fuel Storage Installation, Submittal of Quality Assurance Program Description, Revision 02023-05-24024 May 2023 Independent Spent Fuel Storage Installation, Submittal of Quality Assurance Program Description, Revision 0 DCL-23-032, Independent Spent Fuel Storage Installation Docket No. 72-27, Materials License Number SNM-2514 Humboldt Bay Independent Spent Fuel Storage Installation - NRC Requested Notification of Withdrawal from Voluntary Program2023-05-22022 May 2023 Independent Spent Fuel Storage Installation Docket No. 72-27, Materials License Number SNM-2514 Humboldt Bay Independent Spent Fuel Storage Installation - NRC Requested Notification of Withdrawal from Voluntary Program DCL-23-041, 10 CFR 50.46 Annual Report of Emergency Core Cooling System Evaluation Model Changes for Peak Cladding Temperature for 20222023-05-22022 May 2023 10 CFR 50.46 Annual Report of Emergency Core Cooling System Evaluation Model Changes for Peak Cladding Temperature for 2022 DCL-23-038, Revision to the Unit 1 Reactor Vessel Material Surveillance Program Withdrawal Schedule2023-05-15015 May 2023 Revision to the Unit 1 Reactor Vessel Material Surveillance Program Withdrawal Schedule DCL-23-034, 2022 Annual Nonradiological Environmental Operating Report2023-05-0101 May 2023 2022 Annual Nonradiological Environmental Operating Report DCL-23-036, 2022 Annual Radiological Environmental Operating Report2023-05-0101 May 2023 2022 Annual Radiological Environmental Operating Report DCL-23-025, 2022 Annual Radioactive Effluent Release Report2023-05-0101 May 2023 2022 Annual Radioactive Effluent Release Report DCL-2023-512, Submittal of Receiving Water Monitoring Program 2022 Annual Report2023-04-27027 April 2023 Submittal of Receiving Water Monitoring Program 2022 Annual Report DCL-23-035, Response to Request for Additional Information on Request Regarding Senior Reactor Operator License Application2023-04-24024 April 2023 Response to Request for Additional Information on Request Regarding Senior Reactor Operator License Application DCL-23-028, Technical Specification Bases, Revision 142023-04-24024 April 2023 Technical Specification Bases, Revision 14 DCL-2023-511, Report on Discharge Monitoring for the First Quarter of 20232023-04-20020 April 2023 Report on Discharge Monitoring for the First Quarter of 2023 DCL-23-031, Submittal of Annual Report of Occupational Radiation Exposure for 20222023-04-19019 April 2023 Submittal of Annual Report of Occupational Radiation Exposure for 2022 DCL-23-024, Independent Spent Fuel Storage Installation, Response to Nrg Request for Additional Information for Revision to License Amendment Request 22-01 Request for Approval of Alternative Security Measures for Early Warning System2023-04-0404 April 2023 Independent Spent Fuel Storage Installation, Response to Nrg Request for Additional Information for Revision to License Amendment Request 22-01 Request for Approval of Alternative Security Measures for Early Warning System DCL-23-022, 2023 Annual Statement of Insurance for Pacific Gas and Electric Companys Diablo Canyon Power Plant2023-03-29029 March 2023 2023 Annual Statement of Insurance for Pacific Gas and Electric Companys Diablo Canyon Power Plant DCL-23-023, Decommissioning Funding Report for Diablo Canyon Power Plant, Units 1 and 22023-03-28028 March 2023 Decommissioning Funding Report for Diablo Canyon Power Plant, Units 1 and 2 DCL-23-021, Independent Spent Fuel Storage Installation, Emergency Plan Update2023-03-23023 March 2023 Independent Spent Fuel Storage Installation, Emergency Plan Update DCL-23-020, Responses to NRC Questions Regarding License Renewal Efforts2023-03-17017 March 2023 Responses to NRC Questions Regarding License Renewal Efforts DCL-23-009, Owner'S Activity Report for Unit 2 Twenty-Third Refueling Outage2023-02-22022 February 2023 Owner'S Activity Report for Unit 2 Twenty-Third Refueling Outage DCL-23-008, Request Regarding Senior Reactor Operator License Application2023-02-22022 February 2023 Request Regarding Senior Reactor Operator License Application DCL-2023-503, Annual Sea Turtle Report2023-01-26026 January 2023 Annual Sea Turtle Report DCL-2023-502, (DCPP) 4th Quarter 2022 Report on Discharge Self-Monitoring2023-01-18018 January 2023 (DCPP) 4th Quarter 2022 Report on Discharge Self-Monitoring DCL-22-091, Revised Steam Generator Tube Inspection Report for Twenty-First Refueling Outage2022-12-20020 December 2022 Revised Steam Generator Tube Inspection Report for Twenty-First Refueling Outage DCL-22-089, Core Operating Limits Report for Unit 2 Cycle 242022-12-20020 December 2022 Core Operating Limits Report for Unit 2 Cycle 24 DCL-22-085, Request to Resume Review of the License Renewal Application or, Alternatively, for an Exemption from 10 CFR 2.109(b), Concerning a Timely Renewal Application2022-10-31031 October 2022 Request to Resume Review of the License Renewal Application or, Alternatively, for an Exemption from 10 CFR 2.109(b), Concerning a Timely Renewal Application DCL-22-041, Site-Specific Decommissioning Cost Estimate, Revision 12022-10-12012 October 2022 Site-Specific Decommissioning Cost Estimate, Revision 1 DCL-22-042, Post-Shutdown Decommissioning Activities Report, Revision 12022-10-12012 October 2022 Post-Shutdown Decommissioning Activities Report, Revision 1 2024-01-29
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Pacilic Gas*and Electric Company*
Paula Gerfen Diablo Canyon Power Plant Site Vice President Mail code 104/5/502 P.O. Box 56 Avila Beach, CA 93424 805.545.4596 Internal: 691.4596 Fax: 805.545.4234 April 29, 2020 PG&E Letter DCL-20-036 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Power Plant, Units 1 and 2 2019 Annual Nonradiological Environmental Operating Report
Dear Commissioners and Staff,
Enclosed is the 2019 Annual Nonradiological Environmental Operating Report for Diablo Canyon Power Plant, Units 1 and 2. This report is being submitted in accordance with Subsection 5.4.1 of the Environmental Protection Plan, Appendix B of the Facility Operating License Nos. DPR-80 and DPR-82.
PG&E makes no new or revised regulatory commitments (as defined by NEI 99-04) in this letter.
If you have questions concerning this report, please contact Mr. David Cortina, Chemistry and Environmental Operations Manager, at (805) 545-3517.
Sincerely, Paula Gerfen dqmg/50941710-7 Enclosure cc: Diablo Distribution cc/enc: Scott A. Morris, NRC Region IV Administrator Christopher W. Newport, NRC Senior Resident Inspector Matthew T. Keeling, Executive Officer, Central Coast Regional Water Quality Control Board Balwant K. Singal, NRR Senior Project Manager A member of the STARS Alliance Callaway
Enclosure PG&E Letter DCL-20-036 2019 ANNUAL NONRADIOLOGICAL ENVIRONMENTAL OPERATING REPORT DIABLO CANYON POWER PLANT, UNITS 1 AND 2 Pacific Gas and Electric Company April 2020
Enclosure PG&E Letter DCL-20-036
- 1. Introduction Pacific Gas and Electric Company (PG&E) has prepared the 2019 Annual Nonradiological Environmental Operating Report in accordance with the Environmental Protection Plan (EPP), which is Appendix B of Facility Operating License Nos. DPR-80 and DPR-82 for Diablo Canyon Power Plant (DCPP), Units 1 and 2, respectively. The report describes implementation of the EPP per the routine reporting requirements of EPP Subsection 5.4.1. PG&E remains committed to minimizing the environmental impact of operating DCPP.
- 2. Environmental Monitoring 2.1. Aquatic Issues Aquatic issues are addressed by the effluent limitations and receiving water monitoring/reporting requirements contained in the DCPP National Pollutant Discharge Elimination System (NPDES) permit. The NPDES permit includes applicable requirements of the California State Water Resources Control Board's Ocean Plan and Thermal Plan.
2.1.1. Routine Influent and Effluent Monitoring During 2019, DCPP submitted quarterly NPDES reports containing routine influent and effluent monitoring data and permit compliance summaries to the Central Coast Regional Water Quality Control Board (CCRWQCB). The reports were submitted electronically during the month following the end of each calendar quarter via the California Integrated Water Quality System (CIWQS), an internet database application. DCPP also submitted an annual NPDES report for 2019 to the CCRWQCB in February 2020 via the CIWQS application. The annual report contained monitoring data summaries in tabular and graphical form, and a summary of permit compliance and corrective actions, as applicable, for 2019.
2.1.2. Receiving Water Monitoring Program (RWMP)
The NPDES RWMP, required by the CCRWQCB, included the ecological monitoring, temperature measurements, and State Mussel Watch activities.
Environmental monitoring programs have recorded biological changes in the discharge area since plant start-up. These programs monitor intertidal and subtidal communities of invertebrates, algae, and fish in the discharge cove and at stations north and south of DCPP. During 2019, environmental monitoring continued under the revised RWMP.
The revised RWMP continued historical monitoring tasks, including page 1 of 5
Enclosure PG&E Letter DCL-20-036 temperature monitoring, State Mussel Watch activities, and intertidal and subtidal surveys (with additional stations and increased sampling frequencies).
The NPDES permit remains under administrative extension. In 2000, DCPP reached a tentative agreement with CCRWQCB staff that addressed current and future impacts on receiving waters from ongoing power plant cooling water discharge. This agreement, and the associated NPDES permit renewal application, did not receive the expected approvals from the CCRWQCB in July 2003. Currently, final resolution of outstanding issues related to receiving water impacts, as well as NPDES permit renewal, remain pending. Based on the tentative agreement, future receiving water monitoring requirements will be significantly reduced or potentially eliminated upon approval of a renewed NPDES permit. Power plant wastewater discharge effluent monitoring would continue under a revised NPDES permit.
DCPP submitted the NPDES Receiving Water Monitoring Program:
2018 Annual Report (PG&E Letter No. DCL-2019-512) to the CCRWQCB and the NRC on April 30, 2019. The 2019 Receiving Water Monitoring Program Annual Report will be submitted at the end of April 2020.
2.1.3. Thermal Effects Study DCPP submitted the final Thermal Effects Comprehensive Assessment Report (PG&E Letter No. DCL-98-585) to the CCRWQCB and the NRC in 1998.
2.1.4. 316(b) Studies DCPP submitted the final 316(b) report, entitled 316(b) DemonStration Report (PG&E Letter No. DCL-2000-514), to the CCRWQCB and the NRC on March 1, 2000.
2.2. Terrestrial Issues 2.2.1. Herbicide Application and Erosion Control Herbicides are used as one component of an overall land vegetation management program that includes transmission line corridors and rights-of-way. The company continues to use only herbicides registered by the Environmental Protection Agency and approved by state authorities and applies them in accordance with all applicable regulations.
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Enclosure PG&E Letter DCL-20-036 Another component of the vegetation management program is mastication. Mastication is utilized to reduce fuel loads, create fire breaks, maintain line clearance, and increase line of sight in rights-of-ways. Mastication is a vegetation management tool that reduces ground disturbance and is effective at controlling vegetation when used in conjunction with herbicides.
PG&E continues to implement erosion control activities at the plant site and in the high voltage transmission line corridors as part of an overall land management program. These erosion control activities consist of routine maintenance and prevention efforts performed periodically on an as-needed basis, including seasonal storm activity and wildfire damage repair as applicable.
2.2.2. Preservation of Archaeological Resources A. CA-SLO-2 Site Management Archaeological site CA-SLO-2 is managed in compliance with the Archaeological Resource Management Plan (ARMP) and Operating Procedure EV1.ID2. All projects undertaken within site CA-SLO-2, or immediately adjacent, are reviewed to determine whether archaeological deposits associated with the site are present and, if so, an impact assessment is completed. PG&E would invoke the notification and mitigation procedures identified in the ARMP if a project-related impact were identified.
The annual photo-monitoring of CA-SLO-2 was completed on December 11, 2019, by the PG&E Senior Cultural Resource Specialist.
The overall condition of site CA-SLO-2 remained stable in locations away from the coastal bluff, with only minor changes observed in the interim following the last monitoring event completed in December of 2018. Monitoring indicates that the low soldier-pile retaining wall constructed during 2018 in the west-central portion of the site along a steep road cut is functioning as designed. No new earthen slumping or erosion was observed, and the impacted location has revegetated in the interim. Location specific photographs and a monitoring summary are on file with PG&E.
One notable event in the management of CA-SLO-2 relates to exploratory archaeological testing initiated in late August 2019 to assess potential impacts for the planned replacement of an existing 23 kV transmission system guyed tubular steel pole (TSP) located page 3 of 5
Enclosure PG&E Letter DCL-20-036 within the site. A monitor from the yak titu titu yak tiłhini Northern Chumash Tribe was present on site to observe fieldwork.
A 1 by 2 square meter control unit and column sample were excavated approximately 12-feet southwest of the existing TSP, at the location of the proposed new TSP foundation. A significant collection of artifacts and faunal remains were recovered during field screening of excavated sediments. Further exploration at the location stopped on September 4, 2019, when human remains were discovered in a side wall of the excavation unit, nested within the proposed bore hole for the new TSP foundation.
In compliance with CA Health and Safety Code section 7050.5, the San Luis Obispo County Coroner (Case #1909-07386) was notified of the discovery at 11:37 a.m. on the date of discovery. The County Coroner makes the determination as to whether the remains are of Native American ancestry and verifies the discovery site is not a modern crime scene. Having determined the remains were prehistoric Native-affiliated based on the context of the discovery, the County Coroner referred the matter to the California Native American Heritage Commission (NAHC). The NAHC assigns a Most Likely Descendant (MLD) to work with the land owner (PG&E) on the disposition of the remains. The NAHC designated the Chair Person of the yak titu titu yak tiłhini Northern Chumash Tribe of San Luis Obispo County as the MLD.
PG&Es Senior Cultural Resource Specialist worked closely with the MLD and related tribal members to provide for a dignified reburial of the human remains and proximal midden. The MLD supported the retention of some artifacts and ecofacts for non-destructive analysis and reporting. These items will be reburied via a 4" diameter vertical pipe that was placed temporarily within the former excavation unit to facilitate future reburial of materials and extraction of the pipe. Reporting specific to the archaeological testing and an archaeological site record update remains in progress.
The project planning and engineering teams for the TSP replacement are currently analyzing alternatives that would meet the safety and reliability requirements for the 230 kV system, while lessening or avoiding impacts to the CA-SLO-02 archaeological site.
B. Northern Chumash Correspondence Outreach and coordination with the yak titu titu yak tiłhini Northern Chumash Tribe of San Luis Obispo County in 2019 related to the management of CA-SLO-02 was focused on the 230 kV TSP page 4 of 5
Enclosure PG&E Letter DCL-20-036 replacement project (reference previous section). PG&Es Senior Cultural Resource Specialist served as the primary point of contact for engagement with the tribe in the initial project planning phases during archaeological fieldwork, in response to the discovery of human remains, and in the planning process going forward for project alternatives. The Tribe will continue to be involved as alternatives are explored and ultimately implemented. This engagement will be in addition to other on-going projects and initiatives on the Diablo Lands outside of CA-SLO-02, which require tribal outreach and coordination.
- 3. Unusual or Important Environmental Events There were no unusual or important environmental events during 2019.
- 4. Plant Reporting Requirements 4.1. EPP Noncompliance There were no EPP noncompliances during 2019.
4.2. Changes in Station Design There were no changes in plant design or operation, tests, or experiments that involved an unreviewed environmental question or a change to the EPP.
4.3. Nonroutine Reports There were no nonroutine events during 2019 per the EPP; therefore, no nonroutine reports were submitted to the NRC.
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