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California Regional Water Quality Control Board Central Valley Region Steven T.Butler,Chair Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office Governor Environmental Internet Address: http://www.swreb.ca.gov/--iwgcb5 Protection 3443 Routier Road,Suite A,Sacramento,California 95927-3003 Phone(916)255-3000•FAX(916)255-3015 TO: Gordon L. Boggs FROM: Michael T. Smith UST Program Manager Environmental Specialist H ..�t�DATE: 15 November 1999 SIGNATURE: SUBJECT: NONCONCURRENCE -NO FURTHER ACTION REQUIRED JAY'S MINI MART, 3302 WEST LANE, STOCKTON, SAN JOAQUIN COUNTY On 19 August 1999, San Joaquin County(County) submitted the site Closure Summary for Jay's Mini Mart. On 15 September 1999, I requested the Underground Tank Removal report from the County, which was received on 17 September 1999. 1 informed the County that I could respond to their closure request by 21 October 1999. After I reviewed the reports, I informed the County that groundwater at the site must be analyzed for MtBE before we concur with their closure recommendation. They agreed to inform the responsible party of our decision. In 1997,three underground storage tanks (two 8,000-gallon and one 10,000-gallon gasoline), associated piping, and dispensers were removed from the site. A soil excavator was used in the excavation operation. Native soil samples were collected from the excavator bucket using stainless steel sample sleeves and a hand operated percussion core sampler. Contamination was detected in the samples from beneath the northern ends of tank T1 and dispensers FD 1 and FD2. Soil analyses results are shown below in Table I. The northwest corner of the tank field was over-excavated to 24 feet bgs,removing and stockpiling about 400 cubic yards of impacted soil. Three confirmation soil samples were collected from the excavation and analyzed for TPHg, TPHd and BTEX. Analytical results are shown in Table I, which also lists constituents found in the soil stockpile samples. Groundwater was not encountered during tank removal or the over-excavation activity. Table I—Maximum Soil Test Results at Jay's Mini Mart Tank TI Fuel Dispensers Over-excavation Soil Stockpile Parameter 13-17' bgs FD1 and FD2 N'Corner of (mg/kg) (mg/kg) 3—4' bgs Tank Pit (mg/kg) 24' bgs m TPHg 83 1.2 1.4 65 TPHd 22,000 Not analyzed 230 14,000 Benzene 0.750 0.024 <0.005 0.008 E#i 1 benzene 0.640 0.013 <0.005 1.20 Toluene <0.005 0.099 <0.005 0.290 Xylene 1.4 0.150 0.011 3.60 MtBE <0.005 0.650 . Not analyzed Not analyzed Lead 8.1 Not analyzed Not analyzed 21 California Environmental Protection Agency to Recycled Paper