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f; EDMUNo G. BROWN JR. <br /> _,)�+ DOVEPNOP <br /> C�L I r O p N I♦ MC ET Ew FOgDRIDUE2 <br /> RY <br /> I <br /> Water Boards FNVIRnNMFNTAI ppnTfnTIDN <br /> Central Valley Regional Water Quality Control Board <br /> 30 June 2013 <br /> Mr. George Luxbacher <br /> Glenn Springs Holdings, Inc. <br /> 5005 LBJ Freeway, Suite 1350 <br /> Dallas, TX 75244-6119 <br /> REVIEW OF EXTRACTION WELL INSTALLATION SUMMARY REPORT AND INJECTION <br /> WELL INSTALL TION WORK PLAN, FORMER OCCIDENTAL CHEMICAL CORPORATION <br /> FACILITY, LATHROP, SAN JOAQUIN COUNTY <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region (Central <br /> Valley Water Board) has reviewed the Extraction Well Installation Summary Report and <br /> Injection Well Installation Work Plan (Report), dated 29 April 2013. The Report was prepared <br /> by ARCADIS US, Inc. (ARCADIS) on behalf of Glenn Springs Holdings, Inc., (GSH)for the <br /> former Occidental Chemical Corporation manufacturing facility (Site). The Site is located at <br /> 16777 South Howland Road in Lathrop, San Joaquin County. <br /> The well installation activities summarized in the Report were recommended in the Well <br /> Installation and Hydraulic Testing Report and Additional Well Installation Report, dated 28 <br /> February, 2012, and the Addendum to the Well Installation and Hydraulic testing Report and <br /> Additional Well Installation Work Plan, dated 13 September, 2012, which was approved by the <br /> Central Valley Water Board staff in a letter, dated 9 November 2012. <br /> The objective of the extraction well installation is to expedite the removal of Site contaminants of <br /> concern (CDCs), including 2,3,4,5-tetrahydrothiophene-1,1-dioxide (sulfolane), 1,2-dibromo-3- <br /> chloropropane (DBCP), and ethylene dibromide (EDB) affected groundwater. The newly <br /> installed extraction wells will be connected to the on-site groundwater treatment system to allow <br /> for treatment of groundwater extracted from these new wells. <br /> Initial Well Installation was initiated on 19 December 2012, and was completed on 25 January <br /> 2013. Intermediate extraction wells EW-12A, EW-13, EW-14B, and EW-15B were drilled to a <br /> total depth of approximately 155 feet below ground surface (bgs). Deeper extraction wells EW- <br /> 12B, EW-14B, EW-15B were drilled to a total depth approximately 205 feet bgs. Shallow water <br /> i extraction wells EW-10, EW-11, and EW-17 were installed on 29 and 30 January 2013. These <br /> wells were screened from approximately 10 to 40 feet bgs. <br /> I . <br /> KARL E. LONGLEY SCD, P.E..CHAIR I PAMELA C. CREEDON P.E., BCEE, EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboardsca.gov/oentralvalley <br /> ��n[Ccl.cc rnrcn <br />