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California R, vional Water Quality v-)ntrol Board <br /> Central Valley Region 1 <br /> Peter M.Rooney Sacramento Main Office Ed J.Schnabel <br /> Secretaryfor Internet Address: http://www.swfcb.ca.gov/�-rwgcb5/home.html <br /> Environmental Chair <br /> 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Protection Phone(916)255-3000•FAX(916)255-3015 <br /> TO: Gordon L. Boggs FROM: Mark R. List <br /> UST Program Manager Engineering Geologist <br /> DATE: 30 October 1998 SIGNATURE: .� <br /> SUBJECT: FILE REVIEW FOR CLOSURE CONCURRENCE, ROSSETTI'S MARKET, <br /> 25411 LONE TREE ROAD, ESCALON, SAN JOAQUIN COUNTY <br /> At the request of the San Joaquin County Environmental Health Division (SJCEHD), a file review was <br /> completed to determine if Regional Board staff agree with the SJCEHD determination of no further <br /> action required at this site. This information was obtained during my review of the Regional Board <br /> casefile, for the Ranch Market site. <br /> Background: <br /> On 8 September 1987, four underground storage tanks (USTs), two 3000-gallon unleaded gasoline, one <br /> 7000-gallon leaded gasoline, and one 1000-gallon unleaded gasoline/diesel, were removed from the site. <br /> The fuel product piping and dispensing equipment was also removed on that date. A total of three <br /> excavations were completed, with two USTs located in one excavation and one UST in each of the other <br /> excavations. Under the direction of SJCEHD, one soil sample was collected from each UST excavation <br /> and the excavations were backfilled to surface grade. <br /> The analytical results of the soil samples revealed elevated concentrations of TPHg, benzene, toluene <br /> and total xylenes in the excavation containing two USTs. All other soil samples were below the <br /> laboratory reporting limits for each analysis. Groundwater was not encountered or sampled during UST <br /> removal activities. <br /> On 30 June 1998, five soil borings were installed in the vicinity of the former UST location, to depths <br /> between 6 and 36 feet below ground surface (bgs), to define the extent of soil contamination. Slightly <br /> elevated concentrations of petroleum constituents were encountered in soil borings SB 1 and SB3, <br /> located at the west and east edge, respectively, of the former UST excavation. All other soil borings <br /> were nondetect for petroleum constituents. <br /> Total xylenes were detected in SB 1 at 0.0095 mg/Kg in the sample collected from 35 feet bgs. Soil <br /> samples collected from SB3 revealed elevated concentrations of TPHg and BTEX constituents at <br /> 15 feet bgs, and total xylenes were detected in the sample collected from 20 feet bgs. The fuel <br /> oxygenates were not detected by EPA Method 8260 in the 20 foot sample, and no hydrocarbon <br /> constituents were detected in the 25 feet bgs sample. <br /> California Environmental Protection Agency <br /> Cl?Recycled Paper <br />