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I QUARTERLY GROUND WATER MONITORING July 1995 Chapin Bros.,Inc. 1765 Monte Diablo Avenue Stockton, California 1.0. INTRODUCTIONISCOPE OF WORK In accordance with the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE) has performed quarterly ground water monitoring procedures at 1765 Monte Diablo Avenue in Stockton, California (the site) This report details monitoring and sampling activities performed in July 1995 The monitoring and sampling was performed in accordance with San Joaquin County Public Health Services -Environmental Health Division(PHS-EHD) and Regional Water Quality Control Board (RW guidelines The location of the site is illustrated in Figure 1, a plan of the site is illustrated QCB) in Figure 2 2.0. BACKGROUND 21 HISTORICAL SITE USAGE The site was operated as a gasoline service station from the late 1930s to December 1990 Three underground storage tanks(USTs)were used to dispense gasoline at the site Additional tanks were added at the site between 1941 and 1975 Since 1991 an automotive repair facility has been operating at the site A single L-shaped building, which houses the auto repair business, is currently located on the ' property The building is surrounded to the north and west by an asphalt-paved parking area 2 2 UNDERGROUND STORAGE TANK REMOVAL In August 1993, one 550-gallon waste oil UST, two 4,000-gallon gasoline USTs and two 8,000- gallon gasoline USTs were removed from the site by Jim Thorpe Oil of Lodi, California The tanks � were removed from the north-central portion of the property During removal, three additional USTs were discovered near the western portion of the property and removed These tanks were apparently abandoned in place However,the San Joaquin County Pubhc Health Services -Environmental Health Division(PHS-EHD) has no record of the abandonment Soil samples collected at the time of the tank removals indicated the presence of petroleum hydrocarbon-impacted soils at the site