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 Letter on Hydro-6A Mitigation Measures Submittal, PG&E Topock Compressor Station, Needles, California (EPA ID No. CAT 080011729) | January 22, 2020 | 353.67 KB |
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Click to Download | PG&E Letter to DTSC - MW-23 pH Profiles, PG&E Topock Compressor Station | December 7, 2018 | 990.33 KB |
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Click to Download | PG&E Letter to DTSC - Proposed Modifications, Assessments, and Monitoring Approaches for TW-01, MW-58BR, MW-64BR, and PGE-08BR at PG&E Topock Compressor Station | November 26, 2018 | 9 MB |
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Click to Download | PG&E Letter to DTSC - Conductivity Profile Results from Topock Compressor Station Monitoring Wells | October 26, 2018 | 7.97 MB |
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Click to Download | DTSC Concurrence of Work Plan for Historical Water Supply Well Reconnaisance, Pacific Gas And Electric Company (PG&E), Topock Compressor Station Site Needles, California | June 3, 2018 | 409.26 KB |
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Click to Download | DTSC Statement of Decision and Resolution of Conditional Project Approval | April 24, 2018 | 2.43 MB |
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Click to Download | DOI Approval of the Basis of Design Report / Final (100%) Groundwater Design and the Construction / Remedial Action Work Plan | April 3, 2018 | 136.38 KB |
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Click to Download | DOI Request for Reinitiation of Informal Consultation under Section 7 of the Endangered Species Act Regarding Pacific Gas and Electric Topock Compressor Station AESO/SE 02EAAZ00 Final Groundwater Remedy | March 21, 2018 | 386.44 KB |
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Click to Download | PG&E's Response to DTSC’s Geological Services Unit October 20, 2017 Memorandum titled Comments on Proposal for Alternative Groundwater Sampling Trial, Pacific Gas and Electric, Topock Compressor Station | November 30, 2017 | 259.5 KB |
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Click to Download | DTSC Response to Pacific Gas and Electric Company (PG&E) Comments on Well Salinity Stratification Technical Memorandum Date July 27, 2017 Topock Compressor Station Site, Needles, California (EPA ID No. CAT080011729) | November 1, 2017 | 403.78 KB |
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Click to Download | DTSC Response to Comments on Proposal for Alternative Groundwater Sampling Trial Pacific Gas and Electric Company (PG&E) Topock Compressor Station Site, Needles, California (EPA ID NO. CAT080011729) | October 20, 2017 | 351.38 KB |
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Click to Download | DTSC Response to Comments on Proposal for Alternative Groundwater Sampling Trial Pacific Gas and Electric Company (PG&E) Topock Compressor Station Site, Needles, California (EPA ID NO. CAT080011729) | October 13, 2017 | 429.02 KB |
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Click to Download | DTSC's Conditional Approval of modified key gradient when PE-01 is not pumping | August 18, 2017 | 103.94 KB |
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Click to Download | PG&E response to DTSC's Geological Services Unit April 6, 2017 Memorandum titled Proposal to Alternative Groundwater Sampling Trial, Pacific Gas and Electric, Topock Compressor Station | July 31, 2017 | 2.03 MB |
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Click to Download | PG&E Letter to DTSC regarding Proposed Changes to Gradient Control Well Pairs, PG&E Topock Compressor Station | July 27, 2017 | 991.46 KB |
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Click to Download | PG&E Responses to California Department of Toxic Substance Control's March 13, 2017 Memorandum regarding Salinity Stratification in Wells | July 27, 2017 | 946.22 KB |
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Click to Download | PG&E responses to California State Lands Commission's June 13, 2017 Letter regarding the Groundwater Remedy | July 5, 2017 | 123.63 KB |
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Click to Download | California State Lands Commission Letter to PG&E Regarding the Final Groundwater Remediation Project and a Follow-up to the February 27, 2017 Letter | June 13, 2017 | 760.62 KB |
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Click to Download | Emails from USBR regarding the California State Lands Commission Letter to PG&E Regarding the Final Groundwater Remediation Project | June 13, 2017 | 8.05 MB |
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Click to Download | Cocopah Comments and Recommendations Concerning January 9, 2017 Topock Groundwater Modeling Addendum | April 24, 2017 | 514.06 KB |
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Click to Download | FMIT Comments and Recommendations Concerning January 9, 2017 Topock Groundwater Modeling Addendum | April 24, 2017 | 522.48 KB |
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Click to Download | DTSC's conditional approval of Proposed Trial of Alternative Sampling Approaches (dated August 21, 2015) | April 6, 2017 | 285.97 KB |
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Click to Download | DTSC's March 13, 2017 Memorandum Regarding Well Salinity Stratification and Potential Impacts to Groundwater Sampling | March 13, 2017 | 60.8 KB |
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Click to Download | California State Lands Department Letter to DTSC regarding the Draft SEIR | February 27, 2017 | 266.77 KB |
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Click to Download | Cocopah Tribe Recommendations Concerning Future Topock Flow and Contaminant Transport Modeling | January 27, 2017 | 860.43 KB |
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Click to Download | DOI and DTSC Joint Agency Directives on Topock Groundwater Remediation Project Model Revisions | October 4, 2016 | 146.47 KB |
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Click to Download | DOI and USFWS Review of Protective Measures for Bat | July 12, 2016 | 40.67 KB |
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Click to Download | DOI/DTSC's Reponse to Support of Monitoring Well MW-U installation in Interstate 40 median for the PG&E Topock Compressor Station, Needles, California | December 22, 2015 | 4.49 MB |
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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 | Chemehuevi Tribe response to the October 19, 2015, Final Design Directive to PG&E on Modeling Follow-up for Topock Groundwater Remediation Project | December 2, 2015 | 560.21 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 | DTSC: PG&E's Clarification on on October 19, 2015 Direction Letter for Final Design | November 5, 2015 | 83.52 KB |
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Click to Download | PG&E's Request for extension to submit the cost estimate appendix on or before December 4, 2015 | November 4, 2015 | 65.46 KB |
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Click to Download | Final Design Directives on Topock Groundwater Remediation Project | October 19, 2015 | 900.1 KB |
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Click to Download | Plan for Redevelopment of Arizona Monitoring Well MW-55-120, PG&E Topock Compressor Station, Needles, California; VRP Site Code 506252-01 | September 21, 2015 | 162.82 KB |
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Click to Download | Conditional Approval of Proposal to Modify Interim Measures 3 (IM3) Extraction Well Pumping at Pacific Gas and Electric Company, Topock Compressor Station (PG&E), Needles, California (EPA ID No. CAT080011729) | July 20, 2015 | 70.61 KB |
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Click to Download | ADEQ Response to Review of Arizona Monitoring Wells November - December 2014 Groundwater Sampling Results, Topock Groundwater Site, Needles, California | June 29, 2015 | 130.88 KB |
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Click to Download | Proposal for IM3 Extraction Well Pumping Rate Modifications, PG&E Topock Compressor Station, Needles, California | May 28, 2015 | 88.2 KB |
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Click to Download | Results of PG&E December 2014 and March 2015 sampling of the Moabi Regional Park Wells (PM-03 and PM-04) | April 16, 2015 | 181.05 KB |
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Click to Download | PG&E Topock Compressor Station Remediation Site – DOI Comments on the Draft Basis of Design Report/Intermediate (60%) Design for the Final Groundwater Remedy, PG&E Topock Compressor Station, Needles, California | March 31, 2015 | 51.64 KB |
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Click to Download | Review of Arizona Monitoring Wells November-December 2014 Groundwater Sampling Results, Topock Groundwater Site, Needles, California | March 23, 2015 | 279.72 KB |
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Click to Download | DOI and Water Board confirmation of CMP Report Changes/Reduction | March 20, 2015 | 102.75 KB |
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Click to Download | Comment Resolution Process for the Basis of Design Report/Pre-final (90%) Design Package for the Groundwater Remedy, Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California | February 23, 2015 | 365.13 KB |
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Click to Download | United States Department of the Interior and California Department of Toxic Substances Control Directives on Outstanding issues on the Basis of Design Report/Pre-Final Design (90% Design) Supplemental Package for PG&E Topock Compressor Station Remediation | December 23, 2014 | 5.52 MB |
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Click to Download | DTSC and DOI Directives on Incomplete Elements Identified in the Pre-Final (90%) Basis of Design Report and Construction/Remediation Action Work Plan for the Groundwater Remediation Project at the Pacific Gas and Electric Company (PG&E), Topock Compressor | October 21, 2014 | 195.96 KB |
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Click to Download | DTSC and DOI Email to PG&E: Incomplete Pre-final Groundwater Remedy Design Elements | October 21, 2014 | 163.52 KB |
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Click to Download | Hualapai Letter to DTSC an d DOI: October 7, 2014 Letter to Pacific Gas & Electric Groundwater Remedy Infrastructure Site Verification Field Work | October 8, 2014 | 444.4 KB |
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Click to Download | DTSC Response to Section 7 of the 2013 Annual report Recommendations | June 27, 2014 | 272.98 KB |
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Click to Download | DTSC response regarding the Addendum to RCRA Facility Investigation/Remedial Investigation Report, Volume I - Site History and Background, PG&E Topock Compressor Station, Needles, California (EPA ID No. CAT080011729) | June 4, 2014 | 34.66 KB |
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Click to Download | DTSC Approval of Extension for Review of Draft Risk Assessment Work Plan Addendum II, PG&E Topock Compressor Station, Needles, California | June 2, 2014 | 190.83 KB |
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Click to Download | Request for Information Regarding Historic PG&E Wells, Topock Compressor Station, Needles, California | May 22, 2014 | 571.06 KB |
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Click to Download | DTSC Response to Inquiry Regarding Hyperaccumulative Plants at the Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California (EPA ID No. CAT080011729) | April 30, 2014 | 1.49 MB |
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Click to Download | DTSC and DOI Directives on Outstanding Issues of the Response to Basis of Design Report/ Intermediate (60%) Design Comments for PG&E Topock Compressor Station Remediation Site | April 4, 2014 | 115.14 KB |
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Click to Download | California Water Board Letter: Topock Compressor Station: Remedy Requirements Associated with Injection Groundwater Containing Naturally Occurring Arsenic, PG&E Topock Compressor Station, Needles, California | November 20, 2013 | 246.24 KB |
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Click to Download | DTSC Direction on Freshwater Implementation Activities (via email), PG&E Topock Compressor Station, Needles, California | November 6, 2013 | 51.57 KB |
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Click to Download | PG&E Letter: Cumulative Project Update (2010-2012) for Field Work Performed in Accordance with the Programmatic Biological Assessment for the Pacific Gas and Electric Company Topock Compressor Station | October 11, 2013 | 115.31 KB |
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Click to Download | DTSC letter on Bird Impact Avoidance and Minimization Plan Topock Groundwater Remediation Project, PG&E Topock Compressor Station, Needles, California | October 1, 2013 | 400.77 KB |
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Click to Download | Resolution of the California Department of Toxic Substances Control Adopting an Addendum to the Final Environmental Impact Report Prepared for the Topock Compressor Station Groundwater Remediation Project, Needles, California | September 4, 2013 | 12.82 MB |
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Click to Download | Resolution of the California Department of Toxic Substances Control Approving the Final Implementation Plan for Evaluation of Alternative Freshwater Sources for the Topock Compressor Station Groundwater Remediation Project, Needles, California | September 4, 2013 | 45.09 KB |
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Click to Download | Comment on 60% design extended until 8/8/2013, RFI/RI Vol 1 Addendum until 9/9/13, PG&E Topock Compressor Station, Needles, California | June 21, 2013 | 21.11 KB |
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Click to Download | DOI Response to the Second Part of Freshwater Evaluation Implementation Plan response to comment meeting | June 3, 2013 | 69.96 KB |
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Click to Download | Timing for Submittal of First Quarter GMP-PMR report, PG&E Topock Compressor Station, Needles, California | April 30, 2013 | 100.89 KB |
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Click to Download | Repairing Wells in Accordance with California Well Standards at Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California, (EPA ID No. CAT080011729) | January 28, 2013 | 1.1 MB |
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Click to Download | Request for Second Extension of Groundwater Remedy 60% Design Submittal, PG&E Topock Compressor Station, Needles, California | November 30, 2012 | 197.72 KB |
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Click to Download | Request for Modification of Deadline/Format -- PG&E Biennial Performance Assessment Report for the Injection Wellfield | November 29, 2012 | 113.34 KB |
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Click to Download | DTSC Letter to the California Regional Water Quality Control Board Re: Proposed Injection of Groundwater with Arsenic Concentration Above Maximum Contaminant Level at Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California | August 8, 2012 | 56.57 KB |
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Click to Download | DOI Approval of Revised Groundwater Corrective Measure Implementation/Remedial Design Work Plan for SWMU 1/AOC 1 and AOC 10, PG&E Topock Compressor Station, Needles, California | November 3, 2011 | 84.75 KB |
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Click to Download | Approval of Revised Addendum to Revised Work Plan for East Ravine GW Investigation; Final Rev. Implementation Plan for Repair of Monitoring Wells MW-38S and MW-38D and Old Well/Pipe Reconnaissance at PG&E, Topock Compressor Station, Needles, California | February 24, 2011 | 828.31 KB |
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Click to Download | Topock GMP Monitoring Frequency Modification, PG&E Topock Compressor Station, Needles, California | March 3, 2010 | 88.2 KB |
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Click to Download | Groundwater Characterization Requirements for the East Ravine and Compressor Station Areas, PG&E Topock Compressor Station, Needles, California | February 24, 2010 | 86.69 KB |
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Click to Download | DTSC Approval of Final Groundwater Corrective Measure Study/Feasibility Study Report for SWMU 1/AOC 1 and AOC 10, PG&E, Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | December 18, 2009 | 151.33 KB |
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Click to Download | Final Groundwater Corrective Measures Study/Feasibility Study Report for SWMU 1/AOC 1 and AOC 10, PG&E Topock Compressor Station, Needles, California | December 17, 2009 | 151.33 KB |
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Click to Download | DTSC Letter: Acceptance of Final Groundwater Risk Assessment Report, PG&E Topock Compressor Station, Needles, California | December 10, 2009 | 60.54 KB |
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Click to Download | DTSC Letter: Clarification of Specific California Applicable or Relevant and Appropriate Requirements, PG&E Topock Compressor Station, Needles, California | October 6, 2009 | 1.35 MB |
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Click to Download | DTSC Letter: Conditional Approval of Modifications to the Compliance Monitoring Program, PG&E Topock Compressor Station, Needles, California | September 3, 2009 | 94.33 KB |
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Click to Download | DTSC Conditional Approval of RFI/RI Volume 2 Addendum | May 28, 2009 | 31.64 KB |
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Click to Download | Approval of Proposal for Consolidating Reporting for the Topock Interim Measures Performance Monitoring Program with Site-wide Groundwater Monitoring Program, PG&E Topock Compressor Station, Needles, California | May 26, 2009 | 25.51 KB |
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Click to Download | Approval Letter for the Revised Final RCRA Facility Investigation/Remedial Investigation (RFI/RI), PG&E Topock Compressor Station, Needles, California - Hydrogeologic Characterization and Results of Groundwater and Surface Water Investigation | February 4, 2009 | 42.64 KB |
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Click to Download | Additional Direction on Preparation of the Corrective Measure Study/Feasibility Study at PG&E, Topock Compressor Station, Needles, California (EPA ID NO. CA080011729) | December 8, 2008 | 341.83 KB |
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Click to Download | Clarification of Direction on Preparation of the Corrective Measure Study/Feasibility Study at PG&E Topock Compressor Station, Needles, California | November 6, 2008 | 314.12 KB |
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Click to Download | Change in River Monitoring Program to Include Collection and Analysis of Unfiltered Surface Water Samples at PG&E, Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | October 30, 2008 | 38.33 KB |
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Click to Download | Revision of Monitoring and Reporting Program (MRP), Board Order No. R7-2006-0060, PG&E Topock Compressor Station, Needles, California | August 28, 2008 | 182.18 KB |
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Click to Download | Approved Modifications to the Topock IM Performance Monitoring Program, PG&E Topock Compressor Station, Needles, California | August 4, 2008 | 182.18 KB |
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Click to Download | Modification to Surface Water Monitoring Program at PG&E Topock Compressor Station, Needles, California | July 28, 2008 | 234.84 KB |
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Click to Download | Conditional Approval of the Revised East Ravine Work Plan at PG&E Topock Compressor Station, Needles, California | July 24, 2008 | 35.58 KB |
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Click to Download | Revised Work Plan for East Ravine Groundwater Investigation, PG&E Topock Compressor Station, Needles, California | July 24, 2008 | 51.18 KB |
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Click to Download | Modifications to Hydraulic Data Collection for the Interim Measures Performance Monitoring Program at the PG&E Topock Compressor Station, Needles, California | July 14, 2008 | 115.58 KB |
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Click to Download | Analytical Method Change for Evaluation of Hexavalent Chromium at Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | January 19, 2008 | 37.69 KB |
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Click to Download | Comments on the East Ravine Groundwater Investigation Work Plan Pacific Gas and Electric Company (PG&E), Topock Compressor Station, Needles, California (EPA ID NO. CAT080011729) | January 7, 2008 | 247.91 KB |
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Click to Download | Expanded Metal Analysis at Existing Groundwater Monitoring Wells, PG&E Topock Compressor Station, Needles, California | November 6, 2007 | 1.01 MB |
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Click to Download | Workplan for Groundwater Investigation for Area 10 - East Ravine, PG&E Topock Compressor Station, Needles, California | October 29, 2007 | 39.68 KB |
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Click to Download | DTSC Conditional Approval Letter of Updates and Modifications to GW and Surface Water Monitoring Program | September 28, 2007 | 57.58 KB |
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Click to Download | DTSC Letter Providing Comments on PG&E Responses to Comments on Hydrogeology and Groundwater Sections of February 2005 Draft RFI/RI Report | September 19, 2007 | 227.11 KB |
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Click to Download | DTSC Letter Providing Comments on Corrective Measures/Feasibility Study Work Plan | September 3, 2007 | 1.86 MB |
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Click to Download | DTSC Letter Providing Approval of the PGE-6 Well Decommissioning Report | August 10, 2007 | 48.04 KB |
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Click to Download | Letter to DTSC: Updates and Modifications to Performance Monitoring Program | July 27, 2007 | 83.05 KB |
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Click to Download | Letter to DTSC: Updates and Modifications to Groundwater Monitoring Program | July 20, 2007 | 394.44 KB |
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Click to Download | Email sent July 4 sumarizing PG&E-Agency communications regarding data for RFI-RI Volume 2 for Groundwater | July 4, 2007 | 462.71 KB |
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Click to Download | Well PGE-6 Decommissioning Summary | July 3, 2007 | 2.76 MB |
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Click to Download | DTSC Approval of Work Plan for Anaerobic Core Samples | May 1, 2007 | 39.24 KB |
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Click to Download | DTSC Conditional Approval of Work Plan for Hydraulic Testing in Bedrock Wells | April 2, 2007 | 121.19 KB |
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Click to Download | DTSC Approve Well PGE-6 Revised Decomm Workplan | March 28, 2007 | 97.11 KB |
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Click to Download | DTSC Response to DOI/USGS Comments on Hydraulic Testing in Bedrock Wells WP Addendum | March 28, 2007 | 49.9 KB |
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Click to Download | DTSC Approve Adendum to CA Slant Drilling Workplan | January 31, 2007 | 40.59 KB |
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Click to Download | DTSC Approve Reduced GW Sampling Frequency | January 22, 2007 | 90.79 KB |
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Click to Download | Approval of Addendum 3 to the Floodplain In-situ Hexavalent Chromium Reduction Pilot Study Work Plan | January 12, 2007 | 41.38 KB |
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Click to Download | DTSC Acceptance of Performance Assessment Report for IM3 Injection Well Field | January 5, 2007 | 40.15 KB |
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Click to Download | DTSC Evaluation of Tech Memo: Information Review of GW Conditions in Bedrock Formation | November 3, 2006 | 391.16 KB |
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Click to Download | DTSC Evaluation of Work Plan for Additional GW Characterization Beneath the Colorado River by Slant Boring | October 30, 2006 | 80.58 KB |
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Click to Download | DTSC Approves Request for Modification of Shoreline Surface Water Sampling | October 26, 2006 | 519.49 KB |
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Click to Download | DTSC Review of PGE-6 Decommissioning Work Plan and the Tech Memo: PGE-6 Decommissioning Evaluation | October 23, 2006 | 66.79 KB |
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Click to Download | Slant Boring Plume Investigation Work Plan Letter | September 29, 2006 | 31.84 KB |
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Click to Download | Copy Rescinding of the Request for Approval to Implement Limited Sampling Frequency for Select Metals/General Minerals at IM-3 Injection Monitoring | September 6, 2006 | 187.82 KB |
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Click to Download | Third and Fourth Quarter 2005 Groundwater Monitoring Reports, Compliance Monitoring Program for Interim Measures No. 3 Injection Well Field Area | June 9, 2006 | 229.92 KB |
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Click to Download | Response to Comments on Conditional Approval of Technical Adendum No. 2: Approach to Hydraulic Testing of Wells at Locations 1, 2, and 4 Interim Measures Performance Monitoring | May 9, 2006 | 350.53 KB |
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Click to Download | Conditional Approval of Addendum No. 2 to the Floodplain In-Situ Hexavalent Chromium Reduction Pilot Test Work Plan | May 3, 2006 | 103.59 KB |
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Click to Download | Technical Addendum No. 2: Approach for Hydraulic Testing of Wells at Locations 1, 2, and 4, Interim Measures Performance Monitoring | May 3, 2006 | 451.96 KB |
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Click to Download | Conditional Approval of Chromium Isotope Study Workplan | March 22, 2006 | 766.82 KB |
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Click to Download | Conditional approval of approach to drilling and well installation at locations 1 through 5, well installation workplan for interim measure performance monitoring | February 8, 2006 | 581.83 KB |
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Click to Download | Requirement for revised groundwater flow model report | February 3, 2006 | 153.67 KB |
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Click to Download | Conditional approval to commence start-up of extraction well PE-1 and continued extraction from well TW-3D | January 26, 2006 | 141.42 KB |
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Click to Download | Requirement for chromium isotope study, PG&E Topock Compressor Station Needles, CA | January 13, 2006 | 198.31 KB |
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Click to Download | Conditional approval of the draft well installation work plan for interim measures performance monitoring program, dated 11/30/05 | January 6, 2006 | 524.73 KB |
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Click to Download | Requirement for technical memorandum evaluating potential bedrock fracture porosity and preferential groundwater migration pathways | January 6, 2006 | 21.13 KB |
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Click to Download | IM No. 3 Land Use Area Memo | July 8, 2005 | 939.75 KB |
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Click to Download | Approval with Conditions, Interim Measures No. 3, Dated June 21, 2004, PG&E Topock Compressor Station, Needles, California | June 30, 2004 | 639.38 KB |
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Click to Download | Request for Interim Measures Workplan No.2 (Conversion of Existing Groundwater Monitoring Wells to Extraction Wells): PG&E Topock Compressor Station, Needles, California | February 9, 2004 | 119.88 KB |