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• , GAVIN NrwsOM <br /> opwGOVEflNOR <br /> CALIONNIA <br /> 0914'1111 BYIIG" <br /> imr NEFID <br /> WaterBoards ENVIRGNMERIAL PRUIELIIUN <br /> Central Valley Regional Water Quality Control Board <br /> 14 March 2019 <br /> Mr Roger Smith <br /> Glenn Springs Holdings. Inc <br /> 5 Greenway Plaza, Ste 110 <br /> Houston, TX 17046 <br /> REVIEW OF SITE CHARACTERIZATION WORK PLAN ADDENDUMS, FORMER <br /> OCCIDENTAL 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) have reviewed the following addendums to the Site Characterization work <br /> Plan (Work Plan): <br /> 1. Second Addendum, dated 2 November 2018, proposing additional boreholes/monitoring <br /> wells at PW2, PW35 and PW36. <br /> 2 Third Addendum, dated 8 January 2019, proposing an additional borehole/monitoring <br /> well at PW16. <br /> 3. Fourth Addendum. dated 5 March 2019, proposing one additional borehole/monitoring <br /> well between the Site and City well LWD-6. <br /> The Work Plan and the Addendums were prepared by Geosyntec Consultants. Inc. (Geosyntec) <br /> on behalf of Glenn Springs Holdings, Inc . (GSH) for the former Occidental Chemical <br /> Corporation manufacturing facility (Site). The Site is located at 16777 South Howland Road in <br /> Lathrop, San Joaquin County The main chemicals of concern associated with the Site are 1,2- <br /> Dibromo-3-chloropropane (DBCP).. ethylene dibromide (EDB), and 2.3,4.5-tetrahydrothiophene- <br /> 1,1-dioxide (sulfolane) <br /> The original Work Plan and the First Addendum was approved in an email dated 27 June 2018, <br /> and in a formal letter dated 25 September 2018. The Second and Third Addendums have been <br /> approved via emails dated 11 November 2018. and 9 January 2019, respectively In addition to <br /> the addendum approvals. staff have also approved the new location for well 9 This letter <br /> serves as a formal approval of the Second, Third, and Fourth addendums. <br /> KARL E. LONGLEY SCD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200,Rancho Cordova,CA 95670 1 www.waterboards.ca.gov/centralvalley <br /> `a RECYCLED PAPER <br />