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1 ' Site Background Information R M B GARAGE (ERARDII VENTURES) 715 North Hunter Street, Stockton, California 1 The site is located on the northwest corner of Park Street and North Hunter Street in a ' commercial/residential area of Stockton, California(Figure 1) Based on historical research of the area, the site began dispensing fuel in the 1930's or 1940's and ceased prior to 1986 The site operated as a car dealership until approximately 1987, since 1987, the site has operated as an auto ' service repair shop ' UNDERGROUND STORAGE TANK REMOVAL On 12 April 2001, one 500-gallon waste-oil underground storage tank (UST), T1, and two 500-gallon fuel USTs, T2 and T3, were removed from beneath the sidewalk adjacent to 715 North Hunter Street, Stockton, California The USTs were removed under a San Joaquin County Environmental Health Department(EHD)permit by Stockton Service Station Equipment Company, ' Inc The approximate location of the former USTs is shown on Figure 2 During the UST removals, one soil sample was collected from beneath each of the USTs (T1-W, lieT2-E,and T3-E)and one soil sample was collected 2 5-feet beneath the former locations of the two fuel dispensers and one waste-oil fill port(D1-2 5',D2-2 5',and WO-1) Additionally,two samples were collected from stockpiled soil removed from the excavation(SP1-W and SP1-E) Petroleum ' hydrocarbons were detected in each soil sample collected Total petroleum hydrocarbons quantified as gasoline (TPH-g) was detected in the soil samples collected from beneath the USTs and fuel dispensers at concentrations as high as 4,300 milligrams per kilogram (mg/kg) Total petroleum ' hydrocarbons quantified as diesel and motor oil (TPH-d and TPH-mo, respectively)were detected in samples collected from beneath the former waste oil UST and fill port,and from the stockpile soil samples at concentrations as high as 1,800 mg/kg Oil and grease were detected in the soil sample ' collected from beneath the former waste oil UST at a concentration of 3,900 mg/kg Soil samples collected from beneath the fuel USTs and dispensers were not analyzed for TPH-d,TPH-mo,or oil and grease ' Toluene was detected in all UST and dispenser samples at concentrations as high as 99 mg/kg (T3-E) Ethylbenzene and total xylenes were detected in the soil samples collected from beneath the ' USTs at concentrations as high 200 mg/kg and 1,100 mg/kg, respectively Total lead was detected in all of the soil samples at concentrations as high as 39 mg/kg Chromium, nickel, and zinc were detected in the soil samples collected from beneath the waste oil UST, fill ' location, and the stockpile at concentrations as high as 40 mg/kg, 34 mg/kg, and 330 mg/kg, respectively Metal concentrations were not outside the natural background range for California soils Hexavalent chromium and PCBs were not detected at or above laboratory reporting limits in the soil ' samples analyzed • Advanced GeoEnviron mental,Inc