SITE INFORMATION AND CORRESPONDENCE

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ARCO QUARTERLY SUMMARY REPORT Facility: 4932 Address: 16 E. Harding, Stockton, California ARCO Environmental Engineer: Mr. Paul Supple Consulting Co./Contact Person: SECOR International Incorporated/Rusty Benkosky Consultant Project No.: 077.42010.702 Primary Agency/Regulatory ID No.: San Joaquin County Environmental Health Services. Assembly Bill 681 Status: Property Owned by Atlantic Richfield Company WORK PERFORMED THIS QUARTER (Second Quarter- 2000): 1. No environmental activities were performed during the second quarter. WORK PROPOSED FOR NEXT QUARTER (Third Quarter- 2000): 1. Drill and install four groundwater monitoring wells and one soil vapor extraction well. 2. Prepare report documenting well installation activities. 3. Prepare and submit quarterly summary report. DISCUSSION: The site is located at the intersection of Center Street and Harding Way in Stockton, California, and is an operating AM/PM mini-mart and ARCO service station. The site is located in mixed residential and commercial area of Stockton. Facilities at the site currently include one 20,000-gallon UST and one 22,000-gallon gasoline UST and associated product lines and dispensers. Excavation and removal of three gasoline USTs, and associated dispensers and product lines were performed by Gettler Ryan Construction of Dublin, California between May 25 and June 9, 1999. The excavated USTs consisted of three 10,000-gallon capacity USTs of double-walled fiberglass construction. Over-excavation was performed in the UST complex to accommodate the larger new USTs. Approximately 631 tons of soil were over-excavated from the UST complex. Over-excavation of the UST complex was completed and samples were collected on June 9, 1999. Six samples were collected from the bottom of the UST complex at approximately 19 feet bgs. TPHg and MtBE were reported in one sample each at concentrations of 1.02 mg/kg (T-2S@19') and 0.579 mg/kg (T-3S@19'), respectively. Benzene and fuel oxygenates were reported as nondetect in all samples from the UST after over-excavation. Approximately 150 tons of soil was over-excavated from the product line and dispenser areas. TPHg was reported in three of the six samples at a maximum concentration of 5,430 mg/kg (D4@11'). Benzene was reported in two samples at a maximum concentration 10.6 mg/kg (D4@11'). MtBE was reported in two samples at a maximum concentration of 55.5 mg/kg (D5@8.5).