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t <br /> I <br /> n_ <br /> 3164 Gold Camp Drive <br /> Suite 200 <br /> [De ii F• Rancho Cordova CA 95670 6021 <br /> illxlz�' <br /> Environry �+ U 5 A <br /> Consultants,Inc. 9161638-2085 <br /> FAX 916/638-8385 <br /> November 22, 2000 <br /> Ms Carol Oz <br /> San Joaquin Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Subject Results of Soil Vapor Extraction Test <br /> ARCO Station No 2186 <br /> 3212 North California Street <br /> Stockton, California <br /> Delta Project No D000-330-3 <br /> Dear Ms Oz <br /> Delta Environmental Consultants, Inc (Delta) has prepared this document to present the <br /> results of the soil vapor extraction (SVE) tests conducted at Atlantic Richfield Company <br /> f� (ARCO) facility No 2186 located at 3212 North California Street, Stockton, California <br /> (see Figure 1) The SVE tests were conducted on September 18 and 19, 2000 <br /> The objective of the test was to evaluate if adequate concentrations of petroleum <br /> hydrocarbon laden soil vapors can be extracted from the subsurface and to evaluate the <br /> radius of influence (ROI) for the existing vapor extraction wells The tests were <br /> conducted on existing vapor extraction wells VW-1 S, VW-2S and VW-3S (see Figure 2) <br /> The tests was conducted in accordance with the July 14, 2000 feasibility study workplan <br /> BACKGROUND <br /> In August and September 1995, EMCON observed the drilling of six vertical soil borings <br /> (B-1, B-3 through B-5, B-7, and B-8) and two 45 degree angle borings (B-2 and B-6) <br /> Three of the borings (B-1, B-4, and 13-5) were converted to groundwater monitoring <br /> wells (MW-1 through MW-3), and three of the borings (B-3, B-7, and B-8) were <br /> converted to dual completion vapor extraction wells (VW-1 through VW-3) The depth <br /> of the shallow vapor extraction wells are approximately 37 feet below ground surface <br /> (bgs), and the depth of the deep vapor extraction wells is approximately 62 feet bgs The <br /> vapor extraction wells screened shallow are designated as VW-1S, VW-2S and VW-3S <br /> In October 1996, EMCON observed the drilling of boring B-9 The boring was <br /> converted to groundwater monitoring well MW-4 <br /> In June 1999, the former gasoline underground storage tanks (USTs) and associated <br /> I� dispensers and piping were replaced The former UST complex consisted of two 10,000- <br /> gallon and one 8,000-gallon single-wall fiberglass tanks The 8,000-gallon UST formerly <br /> Providing a Competitive Edge <br />