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Eowum G. anovm.In. <br /> M. M uEz <br /> Water Boards fi <br /> Central Valley Regional Water Quality Control Board <br /> 9 November 2012 <br /> Mr. George Luxbacher <br /> Glenn Springs Holdings, Inc. <br /> 5005 LBJ Freeway, Suite 1350 <br /> Dallas, TX 75244-6119 <br /> REVIEW OF ADDENDUM TO THE WELL INSTALLATION AND HYRAULIC TESTING <br /> REPORT AND ADDITIONAL WELL INSTALLATION WORK PLAN, FORMER OCCIDENTAL <br /> CHEMICAL CORPORATION 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 Addendum to the Well Installation and Hydraulic testing <br /> Report(Report) and Additional Well Installation Work Plan (Work Plan), dated 13 September <br /> 2012. The Work Plan was prepared by ARCADIS US, Inc. (ARCADIS) on behalf of Glenn <br /> Springs Holdings, Inc., (GSH) for the former Occidental Chemical Corporation manufacturing <br /> facility (Site). The Site is located at 16777 South Howland Road in Lathrop, San Joaquin <br /> County. The original Report was submitted on 28 February 2012. <br /> In a letter dated 6 August 2012, the Central Valley Water Board staff requested technical <br /> rationale and additional details in support of the proposed design of the expanded extraction <br /> and injection well network that was outlined in the original Work Plan. <br /> Specifically, the Central Valley Water Board staff requested the following support information: <br /> - a capture zone analysis for proposed extraction wells, <br /> - calculations and modeling results that were used for the design of proposed well network, <br /> - groundwater modeling demonstrating aquifer pump test performance of EW-09, <br /> - an evaluation of the potential effect that the INJ-12 injections may have on the sulfolane <br /> plume. <br /> The Report appears to have addressed the above concerns. Based on the support information <br /> provided by ARCADIS, Central Valley Water Board staff agrees that the implementation of the <br /> expanded extraction and injection well network plan may proceed. Prior to the work, GSH must <br /> obtain all necessary local, County and State permits. <br /> Discharge from the treatment system at the Site shall be regulated by Waste Discharge <br /> Requirements (WDRs) Order No. R5-2012-0106, which was adopted at the Central Valley <br /> Water Board meeting held on 4 October 2012. In an effort to ensure that modified groundwater <br /> injection and extraction treatment system is performing as predicted and remedially effective, <br /> KAPL E. LoKaLcr Sap, P.E.,oww+ I PAYOLA G. GHamm P.E.,BCEE,mommve oFmcen <br /> t 1020 BurtCwAw Ural•!20'0.FuMho Co"kww.CA gWM I www.waLerbwd&csgoWcsr**v@11eV <br /> Cp m�o,n rn P-- <br />