Click on the boxes in the flow-chart below to view documents from each phase of the process.
Important Notice Accessibility of Older Documents Expires After December 30, 2020
All documents published before January 1, 2020 will no longer be accessible on this website after December 30, 2020. After December 30, 2020 all older documents can be accessed through the project repositories or by direct request to California Department of Toxic Substances Control.
Approval Letters and Communications
| Type | Download | Document Name | Publish Date | Size |
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Click to Download | DTSC and DOI Acceptance of the Human Health and Ecological Risk Assessment and Errata, PG&E Topock Compressor Station Needles, California | May 29, 2020 | 186.72 KB |
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Click to Download | Extension for RFI/RI Volume 3 Review | February 27, 2020 | 125.03 KB |
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Click to Download | DOI - Soil Investigation Data Summary Report Request | April 4, 2018 | 86.55 KB |
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Click to Download | DTSC Direction on Refinement of Risk Assessment Evaluation, Pacific Gas and Electric Company (PG&E) Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | November 17, 2017 | 47.32 KB |
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Click to Download | DOI Approval of the Topock Soil RFI/RI - Ambient Study of Dioxins and Furans at the Pacific Gas and Electric Company Topock Compressor Station, Needles, California | November 16, 2017 | 83.75 KB |
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Click to Download | DOI Direction to Soil RFI/RI - Ambient/Background Study of Dioxins and Furans at PG&E Topock Compressor Station | September 22, 2017 | 60.58 KB |
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Click to Download | FMIT Comments on Dioxin/Furan Background Technical Memorandum | August 20, 2017 | 66.8 KB |
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Click to Download | Hualapai Comments on Dioxin/Furan Background Technical Memorandum | August 19, 2017 | 157.17 KB |
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Click to Download | PG&E's Response to DTSC May 23, 2017 Analytical Request | June 23, 2017 | 133.73 KB |
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Click to Download | DTSC's direction to PG&E to proceed with the Soil Risk Assessment | June 20, 2017 | 66.2 KB |
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Click to Download | DTSC request letter to PG&E for Soil Analytical Data | May 23, 2017 | 999.68 KB |
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Click to Download | DOI Approve Revised Work Plan for Ambient/Background Study of Dioxin and Furans | March 6, 2017 | 83.58 KB |
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Click to Download | DTSC Approval of Topock Soil RFI/RI Plan to Address Data Gaps Identified during Work Plan Implementation, DG-WP-03, September 21, 2016, for the PG&E Topock Compressor Station, Needles, California | November 10, 2016 | 188.87 KB |
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Click to Download | DOI Conditional Approval of Topock Soil RFI/RI Plan to Address Data Gaps Identified during Work Plan Implementation, DG-WP-03, September 21, 2016, for the PG&E Topock Compressor Station, Needles, California | November 9, 2016 | 287.96 KB |
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Click to Download | Letter from Cocopah to DTSC/DOI regarding comments on Data Gap Work Plan-3 | October 27, 2016 | 659.21 KB |
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Click to Download | Letter from FMIT to DTSC/DOI regarding comments on Data Gap Work Plan-3 | October 27, 2016 | 44.2 KB |
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Click to Download | Letter from Hualapai to DTSC/DOI regarding comments on Data Gap Work Plan-3 | October 27, 2016 | 561.65 KB |
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Click to Download | Letter from DTSC to DOI Regarding Next Steps on Undesignated Area 1 (UA-1) | September 15, 2016 | 2.03 MB |
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Click to Download | DTSC and DOI Conditional Approval of Topock Soil RFI/RI Plan to Address Data Gaps Identified during Work Plan Implementation, DG-WP-02, February 12, 2016, for the PG&E Topock Compressor Station, Needles, California | March 1, 2016 | 187.19 KB |
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Click to Download | DTSC and DOI Conditional Approval of Topock Soil RFI/RI Plan to Address Data Gaps Identified during Work Plan Implementation, DG-WP-01, January 13, 2016, for the PG&E Topock Compressor Station, Needles, California | February 2, 2016 | 188.88 KB |
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Click to Download | DTSC's Response to the Request for Third Extension to Obtain Access Agreements for Work Specified in the Soil RFI/RI Work Plan for the PG&E Topock Compressor Station, Needles, CA | November 24, 2015 | 32.82 KB |
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Click to Download | PG&E's Request for Third Extension to Obtain Access Agreements for the Completion of Work Under the Soil RFI/RI Workplan for the Topock Remediation Project | November 22, 2015 | 90.9 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 | 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, California | 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 | DTSC's Clarification of Approval of RAWP Addendum 2 | September 15, 2015 | 218.03 KB |
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Click to Download | DOI - Conditional Approval of the Final Human Health and Ecological Risk Assessment Work Plan Addendum 2, Pacific Gas and Electric Company Topock Compressor Station, Needles, California | September 8, 2015 | 94.79 KB |
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Click to Download | DTSC Approval of the Risk Assessment Work Plan Addendum 2 | August 31, 2015 | 215.04 KB |
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Click to Download | DTSC Approval of Soil RCRA Facility Investigation/Remedial Investigation Work Plan (January 2013) and Addendum and Errata (January 2014) for the Pacific Gas and Electric Company, Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | August 24, 2015 | 1.58 MB |
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Click to Download | Final CDFW Response Letter | August 24, 2015 | 1.57 MB |
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Click to Download | CDFW FEIR Comments | August 18, 2015 | 1.18 MB |
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Click to Download | Response to November 30, 2012 FMIT letter regarding Soil Work Plan RTC, Pacific Gas and Electric Company (PG&E), Topock Compressor Station Station, Needles, California | January 7, 2013 | 79.72 KB |
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Click to Download | DOI Letter Regarding the Draft RFI/RI Soil Investigation Work Plan Part B, PG&E Topock Compressor Station, Needles, California | March 10, 2010 | 60.36 KB |
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Click to Download | Part B Soil Investigation Clarification Comments and Additional Direction, PG&E Topock Compressor Station (EPA ID No. CAT080011729) | March 10, 2010 | 484.09 KB |
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Click to Download | DOI Letter Regarding: Acceptance of Work Plan for Time-Critical Removal Action at AOC 4, PG&E Topock Compressor Station, Needles, California | December 18, 2009 | 71.49 KB |
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Click to Download | DTSC Letter Request: Historic Burn Activities and Disposal Practices, PG&E Topock Compressor Station, Needles, California | December 10, 2009 | 469.3 KB |
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Click to Download | DTSC Part B Soil Investigation at the PG&E Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | October 5, 2009 | 1.4 MB |
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Click to Download | RCRA Facility Investigation/Remedial Investigation Soil Investigation - Part B, PG&E Topock Compressor Station, Needles, California | August 3, 2009 | 120.33 KB |
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Click to Download | PG&E Proposal to Defer the Part B Soil Investigation at the Topock Compressor Station, Needles, California (EPA ID No. CAT080011729) | July 2, 2009 | 141.81 KB |
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Click to Download | DOI Action Memorandum: Request for Time-Critical Removal Action Number 4 at AOC 4 Debris Ravine, Pacific Gas and Electric Topock Compressor Station | May 28, 2009 | 442.62 KB |
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Click to Download | PG&E: Concurrence on Redline Soils Background Tech Memo, PG&E Topock Compressor Station, Needles, California | May 12, 2009 | 41.65 KB |
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Click to Download | DTSC Approval of the final Risk Assessment Work Plan | February 4, 2009 | 96.66 KB |
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Click to Download | Conditional Concurrence on August 29, 2008 Final Soil and Sediment DUA Usability Assessment Technical Memorandum for PG&E Topock Compressor Station, Needles, California | October 27, 2008 | 41.97 KB |
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Click to Download | DOI Approval of Final Soil and Sediment Data Usability Assessment Technical Memorandum, PG&E Topock Compressor Station Remediation Site | October 15, 2008 | 53.12 KB |
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Click to Download | Field Report: White Powder Occurrences in the East Ravine - Area of Concern (AOC) 10, PG&E Topock Compressor Station, Needles, California | June 18, 2008 | 6.42 MB |
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Click to Download | DTSC Letter Providing Comments on Soil and Sediment Data Usability Assessment Technical Memorandum | August 31, 2007 | 58.19 KB |
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Click to Download | DTSC Letter Providing Comments and Conditional Approval of RFI/RI Soil Investigation Work Plan, Part A | August 10, 2007 | 2.47 MB |