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Welcome to the California Department of Toxic Substances Control (DTSC) website for the Topock Compressor Station (Station) and adjacent land, collectively known as the Topock Project Site (Site). Environmental investigation and cleanup activities (under a Corrective Action) have been under way at the site since 1997.

Protection of California's groundwater and surface water resources, including the Colorado River, is one of DTSC's highest priorities. In 2004 DTSC directed PG&E to take actions, known as Interim Measures, to ensure that the chromium plume flows away from the Colorado River while additional investigation and final cleanup options are evaluated. In 2009, PG&E identifed and evaluated cleanup options for chromium in groundwater. DTSC has certified the Final Environmental Impact Report and adopted a Final Remedy for the groundwater plume. The U.S. Department of the Interior (DOI) Groundwater Record of Decision was finalized in December 2010 and is available for review.  On January 2011, DTSC selected a Final Remedy based on PG&E’s study for the Site. The U.S. Department of the Interior (DOI) Groundwater Record of Decision was finalized in December 2010 and is available for review.

This website provides an overview of current Site activities and other Site-related information. Information on this website includes:
    		• Station and Site location and history
    		• Investigation and cleanup activities: past, present and future
    		• Community Outreach Information

    To visit DTSC on our main website go to www.dtsc.ca.gov.     		 
    		• COMMUNITY SURVEY -
    DUE MARCH 1!
    You may complete the community survey online before March 1, 2012 by clicking here.
    		• DTSC's January, 2012 Topock Environmental Investigation Update Fact Sheet and community survey are now available to view online! Click here to view the printable version of the community survey.
    		• DTSC held a Consultative Workgroup (CWG) meeting on January 18, 2012 in Boulder City, Nevada at the Bureau of Reclamation office. The next CWG meeting is scheduled for April 18, 2012 in Henderson, Nevada.
    		• The Technical Workgroup (TWG) committee of the CWG held a meeting on January 19, 2012 in Boulder City, Nevada at the Bureau of Reclamation office. The next TWG meeting is scheduled for April 19, 2012 in Henderson, Nevada.
    		• DTSC and Department of Interior jointly hosted a Community meeting and Open house at Golden Shores in Topock, Arizona on December 12, 2011 to update the community on the PG&E site. Click here to see the presentation provided at the meeting.
    		• The DTSC project team participated in a Tribal Cultural Sensitivity Training on September 8-9, 2011, held by the Hualapai Indian Tribe on their reservation in Peach Springs, Arizona.

    Activities at a Glance
    		• On January 31, 2011, DTSC directed PG&E to prepare and submit a Corrective Measure Implementation/Remedial Action (CMI/RD) Work Plan within 90 calendar days. On May 2, 2011, PG&E submitted a Draft CMI/RD Work Plan. Tribes, agencies, and stakeholders provided comments on the Work Plan. Responses to comments are being prepared and a Revised CMI/RD Work Plan is planned for mid- September 2011.
    		• On May 6, 2011, PG&E submitted a combined Soil RFI/RI Work Plan. Tribes and agencies provided comments on the Work Plan. Responses to comments are being prepared and a Revised Work Plan is planned to be submitted in mid November 2011.
    		• Well installation and hydraulic testing in the East Ravine continues. The results of these investigation activities will be included in a summary report, and will be used to support the design of the groundwater remedy.
    		• Post-completion monitoring of the uplands in-situ pilot test area is continuing through 2011.
    		• The Interim Measures goal of maintaining contaminated groundwater flow away from the Colorado River continues to be met, as reported in the Quarterly Performance Monitoring/Groundwater Monitoring Reports. As an added benefit, the Interim Measures system has also removed approximately 6,777 lbs. of chromium from the groundwater (through August, 2011).
    		• Biological and cultural resource surveys are continuing through 2011.
    		• On June 24, 2009, DOI directed PG&E to implement a time- critical removal action through the issuance of the Area of Concern (AOC) 4 Debris Ravine Time-Critical Removal Action Memorandum. Work planning and consultation for the removal activities immediately ensued, and DOI approved PG&E?s Work Plan on December 15, 2009. Time-Critical Removal Action field activities were performed from December 2009 through December 2010 in compliance with the Time-Critical Removal Action Work Plan. During this time approximately 11,799 tons of waste was removed from the AOC4 Debris Ravine. On March 15, 2011, PG&E completed the Implementation Report for the Time-Critical Removal Action at AOC 4, Pacific Gas and Electric Company Topock Compressor Station, Needles, California.
    		• On December 18, 2009, DTSC and DOI approved PG&E?s Final Corrective Measures Study/Feasibility Study (CMS/FS) Report.
    		• DTSC and DOI approved the Revised Groundwater Risk Assessment Report (December 2009) on December 10 and December 15, 2009, respectively.

     
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