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California Regional Water Quality Control Board 00-1 <br /> l\- Central Valley Region <br /> v Robert Schneider,Chair Gray Davis <br /> Governor <br /> Winston H.Hickox <br /> Sacramento Main Office <br /> Secretaryfor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,'•SuiteA amment(,California16) 95827 3003 <br /> Phone(91(a) <br /> 20 March 2001 <br /> Mr. W.T.Nickerson <br /> UNOCAL Asset Management Group <br /> 8788 Elk Grove Blvd,Bldg 3, Suite 15 <br /> Elk Grove, CA 95624 ; <br /> APPROVAL OF WELL INSTALLATIOI)Ji WORKPLAN, WESTERN FARM SERVICE <br /> (FORMER PUREGRO), STOCKTON, $AN JOAQUIN COUNTY <br /> UNOCAL is implementing the 6 October 2000 Aquifer Testing Workplan (Aquifer Work Plan) <br /> for the Western Farm Service facility in Stockton that was proposed by your consultant, Sierra- <br /> Pacific Group and approved by our 31 gctober letter. Pursuant to Siena-Pacific's 25 January <br /> 2001 letter, contaminants were detected in the lower(B-zone) aquifer. As a result,UNOCAL is <br /> rt of groundwater contamination in the A and B aquifers, <br /> proposing to investigate the lateral exte <br /> and install a B-zone extraction well to 4upplement aquifer characterization and remediation. <br /> Sierra-Pacific Group provided a worki plan for four monitoring well pairs and a work plan for a <br /> B-zone extraction well in the following letters: <br /> f gr ested Well Work Plan) <br /> • 12 March 2001 Plume Chara terization Wells program (N <br /> • 14 March 2001 New Pumpin g Well, Aquifer Testing Program (Extraction Well Work Plan) <br /> The Nested Well Work Plan descVar <br /> the four locations of the nested well pairs that are <br /> designed to identify the lateral extf contaminants in the A and B zone aquifers. These well <br /> pairs are positioned near the estimlimits of the shallow (A zone) contamination plume in the <br /> upgradient and downgradient dire . If the results of these well installations show that the <br /> plume limits are not sufficiently it ed, additional wells will be proposed, as agreed to by Mr. <br /> Eric Chase of Sierra-Pacific in ouarch 2001 telephone conversation According to the <br /> Nested Well Work Plan, Sierra-P � /ill follow the well installation protocol for nested wells <br /> as described in the 6 October 200fer Work Plan. <br /> Californvi -onmental Protection Agency <br /> ecycled PaperThe energy challenge facing California is real. Evifo t n ne •ds to take immediate action to reduce energy consumption. For a list of <br /> simple ways you can reduce demand and cut yourcosts,see o r Web-site at http://www.swrcb.ca.gov/rwgc65 <br />