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0 • <br /> ARCO QUARTERLY SUMMARY REPORT <br /> Facility: 4932 Address: 16 E. Harding, Stockton, California <br /> ARCO Environmental Engineer: Mr. Paul Supple <br /> Consulting Co./Contact Person: SECOR International Incorporated/Rusty Benkosky <br /> Consultant Project No.: 077.42010.703 <br /> Primary Agency/Regulatory ID No.: San Joaquin County Environmental Health Services <br /> Assembly Bill 681 Status: Property Owned by Atlantic Richfield Company <br /> WORK PERFORMED THIS QUARTER (Third Quarter - 2000): <br /> 1. Drilled and installed four groundwater monitoring wells (MW-1 through <br /> MW-4) and one soil vapor extraction well (SVE-1). <br /> 2. Prepared and submitted quarterly status letter. <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth Quarter- 2000): <br /> 1. Conduct quarterly groundwater monitoring and sampling. <br /> 2. Prepare and submit quarterly groundwater monitoring report. <br /> 3. Prepare and submit site assessment report. <br /> DISCUSSION: <br /> The site is located at the intersection of Center Street and Harding Way in Stockton, <br /> California, and is an operating AM/PM mini-mart and ARCO service station. The site <br /> is located in mixed residential and commercial area of Stockton. Facilities at the site <br /> currently include one 20,000-gallon UST, one 22,000-gallon gasoline UST, and <br /> associated product lines and dispensers. <br /> Excavation and removal of three gasoline USTs, and associated dispensers and product <br /> lines were performed by Gettler Ryan Construction of Dublin, California between May <br /> 25 and June 9, 1999. The excavated USTs consisted of three 10,000-gallon capacity <br /> USTs of double-walled fiberglass construction. Over-excavation was performed in the <br /> UST complex to accommodate the new USTs. Approximately 631 tons of soil were <br /> over-excavated from the UST complex. Over-excavation of the UST complex was <br /> completed and samples were collected on June 9, 1999. Six samples were collected <br /> from the bottom of the UST complex at approximately 19 feet bgs. TPHg and MtBE <br /> were reported in one sample each at concentrations of 1.02 mg/kg (T-2S @ 19') and <br /> 0.579 mg/kg (T-3S@19'), respectively. Benzene and fuel oxygenates were reported as <br /> nondetect in all samples from the UST after over-excavation (Soil Sampling during <br /> UST, Product Line, and Dispenser Removal Activities Report,Dec 10, 1999). <br /> Approximately 150 tons of soil was over-excavated from the product line and dispenser <br /> areas. TPHg was reported in three of the six samples at a maximum concentration of <br /> 5,430 mg/kg (D4 @ I F). Benzene was reported in two samples at a maximum <br />