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California Reoonal Water Quality Antrol Board ,:` ° `., <br /> -t <br /> � of <br /> Central Valley Region .w o i <br /> Karl E. Longley,ScD, P.E.,Chair <br /> Linda S.Adams Arnold <br /> Secretaryfor 11020 Sun Center Drive#200,Rancho Cordova,California 95670-644(j Schwarzenegger <br /> Environmental PHONE(916)464-3291 •FAX(916)464-4645 �DMIDD <br /> Governor <br /> www <br /> Protection http:// .waterboards.ca.gov/centralvalley <br /> 8 July 2009 ENV.�UC � � <br /> P�Rcj� c.Ty <br /> Mr. Bob Spencer <br /> VICES <br /> West Coast Tomato, Inc. <br /> P.O. Box 936 <br /> Palmetto, FL 34220 <br /> ADDITIONAL SUBSURFACE INVESTIGATION REPORT, WEST COAST TOMATO, <br /> 2900 HARDING WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Central Valley Water <br /> Board) staff reviewed the 12 June 2009 Additional Subsurface Investigation Report (Report) <br /> prepared by Ground Zero Analysis, Inc. (Ground Zero) on behalf of West Coast Tomato, Inc. <br /> (West Coast Tomato) for the aboveground storage tank (AGT) release at 2900 Harding Way <br /> in Stockton (Site). <br /> The Site is in a rural/commercial area east of Stockton and is currently occupied by a produce <br /> packaging facility. Western Tomato leased the Site from 1968 until it purchased the property <br /> in 1978. Texaco (now Chevron Corporation) installed, supplied and/or serviced AGTs at the <br /> Site from 1972 until at least 1978. The Site consisted of four 100-gallon AGTs, two <br /> 2,000-gallon AGTs, and two dispensers. The type of fuel stored at the Site and the AGT <br /> removal dates are unknown. In 1994, Western Tomato sold the Site to West Coast Tomato of <br /> California, which sold it to Chip Arnett/Chipa Properties in 2004. <br /> On 20 April 2009, West Coast Tomato drilled six soil borings to define the lateral extent of soil <br /> contamination at the Site. West Coast Tomato drilled one soil boring downgradient of the <br /> polluted monitoring well to 32 feet below ground surface (bgs) and the other five borings to <br /> 24 feet bgs. Soil boring SB-5 was drilled about seven feet northeast of monitoring well MW-1 <br /> and was the only boring to have detections of petroleum hydrocarbons. The maximum total <br /> petroleum hydrocarbons as gasoline (TPHg) and TPH as diesel (TPHd) concentrations in <br /> SB-5 were 130 milligrams per kilogram (mg/kg) and 2,200 mg/kg, respectively. West Coast <br /> Tomato concludes that these data indicate the soil contamination is isolated near MW-1, soil <br /> boring SB-5, and previous soil boring B-2. <br /> The Report also includes a work plan to install one new monitoring well about 100 feet <br /> downgradient of MW-1 to a depth of 67 feet bgs. The new well will be used to define the <br /> lateral extent of the groundwater plume. West Coast Tomato will collect soil samples at five- <br /> foot intervals and analyze up to three soil samples. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />