Click on the boxes in the flow-chart below to view documents from each phase of the process.
Approval Letters and Communications
| Type | Download | Document Name | Publish Date | Size |
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Click to Download | PG&E Letter to CRWQCB regarding PG&E Topock Compressor Station Phase 1 Groundwater Remedy Water Conditioning Plant Operational Start‐Up, Notification RWQCB Order No. R7‐2018‐0022, RWQCB WDID No. 7B362186001, Global ID No. L10004096479 | March 23, 2022 | 2.28 MB |
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Click to Download | Email to DTSC and DOI regarding Agency Notification - IM No. 3 is in lay-up mode (starting March 22, 2022) | March 22, 2022 | 10.7 KB |
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Click to Download | PG&E's Clarification on October 19, 2015 Direction Letter for Final Design (Originally Published 11/5/2015) | December 8, 2020 | 83.52 KB |
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Click to Download | USACE Confirmation of CERCLA Permit Exemption, PG&E Topock Compressor Station, Needles, California (Originally Published 7/10/2013) | December 8, 2020 | 283.84 KB |
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Click to Download | DTSC to PG&E – Postponement of Groundwater Remedy Construction | April 6, 2020 | 110.71 KB |
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Click to Download | DOI to PG&E – Orderly and Temporary Shutdown of the Final Groundwater Remedy Construction Field Activities during the COVID-19 Pandemic | April 1, 2020 | 138.74 KB |
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Click to Download | Acceptance and Conditional Approval of Groundwater Remedy Design and Corrective Measures Implementation Workplan at Pacific Gas and Electric Company, Topock Compressor Station, Needles, California | April 24, 2018 | 2.43 MB |
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Click to Download | Request for Reinitiation of Informal Consultation under Section 7 of the Endangered Species Act (2014 PBA) | December 1, 2017 | 1.96 MB |
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Click to Download | Request for Reinitiation of Informal Consultation under Section 7 of the Endangered Species Act (2007 PBA) | November 30, 2017 | 2.19 MB |
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Click to Download | DTSC Information Request on Historic Well Investigation in 2014 | September 27, 2016 | 37.54 KB |
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Click to Download | DOI and USFWS Review and Approval of Proposed Protective Measures for Roosting Bats | July 12, 2016 | 40.67 KB |
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Click to Download | Chemehuevi Tribe Response to the October 19, 2015, Final Design Directive to PG&E on Modeling Follow-up for Topock Groundwater Remediation Project | December 22, 2015 | 560.21 KB |
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Click to Download | DTSC: Concurrence of TCS-4 Decommissioning | December 15, 2015 | 52.78 KB |
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Click to Download | ARCADIS Response to Fort Mojave Indian Tribe Comments on the Final Design Directives on Topock Groundwater Remediation Project | December 4, 2015 | 30.1 KB |
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Click to Download | Fort Mojave Tribe response to the October 19, 2015, Final Design Directive to PG&E on Modeling Follow-up for Topock Groundwater Remediation Project | November 20, 2015 | 92.28 KB |
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Click to Download | PG&E's Request for Second Extension to Obtain Access Agreements for the Completion of Work Under the Soil RFI/RI Workplan for the Topock Remediation Project | November 2, 2015 | 33.11 KB |
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Click to Download | DOI/DTSC's Final Design Directives on Topock Groundwater Remediation Project | October 19, 2015 | 900.1 KB |
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Click to Download | DTSC's Response to the Request for Extension to Obtain Access Agreements for Work Specified in the Soil RFI/RI Work Plan for the PG&E Topock Compressor Station, Needles, CA | September 23, 2015 | 33.01 KB |
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Click to Download | PG&E's Request for Extension to Obtain Access Agreements for the Completion of Work Under the Soil RFI/RI Workplan for the Topock Remediation Project | September 22, 2015 | 95.92 KB |
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Click to Download | Assessment of Biological Resources for a 35-acre area on the West Side of Moabi Regional Park: Final Groundater Remedy, Topock Compressor Station, California | September 8, 2015 | 4.85 MB |
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Click to Download | Bat Surveys of the Topock Compressor Station Soil Investigation and Groundwater Remediation Project Areas | July 7, 2015 | 1.94 MB |
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Click to Download | Topock Compressor Station Groundwater Remedy Archaeological and Historical Field Procedures and Protocols For Monitoring/Verification | October 23, 2014 | 64.2 KB |
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Click to Download | Topock Compressor Station Groundwater Remedy Request to Reduce Archaeological and Historical Site Annual Monitoring Effort | October 21, 2014 | 55.64 KB |
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Click to Download | DTSC Letter to PG&E: Groundwater Remedy Infrastructure Site Verification Field Work and Request to Reduce Archaeological Sites for Upcoming Annual Monitoring at Pacific Gas and Electric Company (PG&E), Topock Compressor Station Site, Needles, California | October 7, 2014 | 497.34 KB |
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Click to Download | May 8, 2014 and June 11, 2014 Letters on Risk Assessment Work plan Addendum 2 for the Pacific Gas and Electric (PG&E), Topock Compressor Station Site, Needles, California (EPA ID NO. CAT080011729) | September 23, 2014 | 40.66 KB |
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Click to Download | Invitation to Review and Comment on Pacific Gas & Electric Topock Compressor Station Decommissioning Plan for Topock Compressor Station Well 4 (TCS-4) July 11, 2014. Document ID: PGE2014711A | September 15, 2014 | 480.46 KB |
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Click to Download | DTSC Approved Comment Period Extension for Draft Soil Investigation Environmental Impact Report | August 4, 2014 | 58.83 KB |
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Click to Download | DTSC Review of a Risk Assessment Work Plan Addendum 2, PG&E Topock Compressor Station, Needles, California | July 18, 2014 | 1.27 MB |
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Click to Download | Response to Department of Toxic Substance Control's May 22, 2014 Letter "Request for Information Regarding Historic Pacific Gas and Electric Company Wells, Topock Compressor Station Site, Needles, California (EPA ID No. CAT080011729) | July 18, 2014 | 3.59 MB |
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Click to Download | Agencies Approval of RFI/RI Volume I Addendum | July 8, 2014 | 16.48 KB |
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Click to Download | Request for Concurrence on the Pacific Gas and Electric Topock Compressor Station Final Groundwater Remedy, San Bernardino County, California and Mohave County, Arizona | July 7, 2014 | 240.1 KB |
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Click to Download | February 4, 2013 DTSC Letter Requesting Information on Potential Historic Offsite Disposal of Hazardous Substances from the PG&E Topock Compressor Station (CAT080011729) | March 8, 2013 | 122.84 KB |
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Click to Download | California Department of Fish and Wildlife Confirmation of Application of CERCLA 121(e)(1) Permit Exemption to PG&E Soil and Groundwater Investigation and Remediation Project | March 6, 2013 | 1.04 MB |
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Click to Download | Review of Risk Assessment Work Plan Addendum Scoping Document and Chromium Uptake Technical Memorandum for Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California (EPA ID No. CAT080011729) | February 26, 2013 | 56.95 KB |
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Click to Download | Request for Information on Potential Historic Offsite Disposal of Hazardous Substances from the PG&E Topock Compressor Station (CAT080011729) | February 4, 2013 | 56.38 KB |
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Click to Download | Correction to the Extension and Modification of the Programmatic Biological Assessment for Pacific Gas and Electric Topock Compressor Station Remedial and Investigative Action, January 2007 | January 9, 2013 | 50.89 KB |
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Click to Download | Extension and Modification of the Programmatic Biological Assessment for Pacific Gas and Electric Topock Compressor Station Remedial and Investigative Action, January 2007 | December 27, 2012 | 73.54 KB |
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Click to Download | PG&E Letter to the BLM regarding the Ethnographic Study, PG&E Topock Compressor Station, Needles, California | August 9, 2012 | 69.68 KB |
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Click to Download | DTSC Acceptance of Cultural Resource Consultant in accordance with CUL-1a-3a, PG&E Topock Compressor Station, Needles, Calfornia | March 2, 2012 | 82.3 KB |
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Click to Download | CUL-1a-3a – Retaining a Qualified Cultural Resource Consultant to implement the Mitigation Monitoring and Reporting Program, PG&E Topock Compressor Station, Needles, California | January 27, 2012 | 88.17 KB |
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Click to Download | Direction to Sample Select Groundwater Wells for Contaminants Recently Detected in Soil Samples and Request to Document Burn Activities within the Area of Concern 4 (AOC-4) Debris Ravine Area, PG&E Topock Compressor Station, Needles, California | May 15, 2009 | 118.9 KB |
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Click to Download | Comments on the Ecological Exposure Parameters, Bioaccumulation Factors, and Toxicity Reference Values Pacific Gas and Electric Company (PG&E) Topock Compressor Station Needles, California (EPA ID NO. CAT080011729) | January 18, 2008 | 1.77 MB |
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Click to Download | CERCLA Permit Exemption | November 16, 2007 | 540.44 KB |
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Click to Download | DOI and Federal Agencies Approval of RFI-RI Volume 1 Revised August 2007 | September 21, 2007 | 310.28 KB |
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Click to Download | Cover Letter to BLM/DTSC Re: Photos of Topock Compressor Station and Vicinity | August 22, 2007 | 231.45 KB |
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Click to Download | DTSC Acceptance Letter of Revised Final RFI/RI Vol 1 | August 15, 2007 | 49.12 KB |
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Click to Download | DTSC Letter Providing Comments on MW-20 Bench Batch Treatment Facility Decommissioning Work Plan | July 11, 2007 | 81.14 KB |
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Click to Download | 2006 Annual Report - Archaeological and Historical Resources Management Activities for Topock (Applied EarthWorks) | July 1, 2007 | 43.72 KB |
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Click to Download | DTSC CMS Work Plan Comments | May 15, 2007 | 83.85 KB |
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Click to Download | DTSC RFI Volume 1 Response to Comments | May 9, 2007 | 203.82 KB |
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Click to Download | DTSC RFI Volume 1 Response to Comments Cover | May 9, 2007 | 37.58 KB |
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Click to Download | DTSC Requirement for Phase II Chromium Isotope Study Workplan | April 5, 2007 | 121.64 KB |
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Click to Download | DTSC Conditional Approval of the In-situ Hexavalent Chromium Reduction Pilot test Work Plan- Upland Plume Treatment | April 4, 2007 | 5.38 MB |
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Click to Download | DTSC Project Organizational Chart | October 24, 2006 | 33.64 KB |
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Click to Download | December 24, 2005 and April 23, 2006 Lubricating Oil Releases Topock Compressor Station - Investigation Results Letter Report | September 7, 2006 | 1.61 MB |
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Click to Download | April 16, April 29, and May 2, 2006 Waste Water Releases at the Topock Compressor Station - Investigation Results Letter Report | September 5, 2006 | 2.23 MB |
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Click to Download | Response to Comments Related to the Site History Portion of the RFI Report Dated February 2005 | July 13, 2006 | 3.75 MB |
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Click to Download | Requirement for the preparation of a data quality Assessment Technical Memorandum | March 17, 2006 | 196.56 KB |
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Click to Download | Clarification regarding requirements for information to be included in progress | January 6, 2006 | 20.12 KB |
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Click to Download | Transmittal of resource conservation recovery act (RCRA) facility assessment questionnaire | January 6, 2006 | 89.5 KB |
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Click to Download | BLM Action Memorandum - Removal Action No. 3 - September 17, 2004 | September 17, 2004 | 910.45 KB |
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Click to Download | Closure Certification Letters - May - June 1995 | May 11, 1995 | 257.63 KB |