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 | 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 |