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• •. SOIL ASSESSMENT RELATED TO REMOVAL OF UNDERGROUND TANKS 620 West Charter Way, Stockton, California ' Delta Project No 40-88-686 Page 2 o Collect soil samples, using standard protocol, for description and classification purposes and for chemical analysis by a state -certified laboratory o Use a photoionization detector (PID) to screen soil samples for total organic vapors o Submit selected soil samples for chemical analysis o Analyze selected soil samples for total petroleum hydrocarbons (TPH) by EPA Method 8015 Those samples with TPH concentrations exceeding 100 parts per million (ppm), will be analyzed for benzene, toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020 o Prepare a report of our findings with recommendations ■ 2.0 BACKGROUND INFORMATION 2 1 Site Settine The site is an operating Shell Service Station The site is located at 620 West Charter Way in Stockton, California, (TIN, R6E1, M D M ) (Figure 1) Records of the San Joaquin County Assessor's Office indicate that this is parcel number 165--040-07 and that the land is owned by Shell Oil Company Shell's regional representative is Mr Darrell Robinson, Senior District Engineer, Pacific Northwest District, 100 Howe Avenue, Suite 160N, Sacramento, California The site is located in a commercial/retail district Adjacent businesses include a restaurant and a motel 2 2 Site History The existing retail gasoline outlet was constructed in 1971 Figure 2 illustrates existing buildings and facilities at the site Three underground gasoline storage tanks and a waste oil storage tank were installed at this time The original waste oil tank was removed in 1987 and replaced with a dual - walled waste oil tank Vapor recovery lines were installed in 1975 and new product --distribution tines were installed in 1978 Pertinent storage tank data is contained in Table 1 t