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. QUARTERLY REPORT <br />' April 1996 <br /> Cal West Concrete Cutting <br /> 1153 Vanderbilt Circle, <br />' Manteca, California <br />' 1.0. INTRODUCTION/SCOPE OF WORK <br /> In accordance with the request of Mr Rick Cissell of Cal-West Concrete Cutting, Advanced <br />' GeoEnvironmental, Inc (AGE) has prepared this quarterly report of ground water monitoring <br /> activities performed at 1153 Vanderbilt Circle, Manteca, California (the site) This report documents <br /> the monitoring and sampling procedures performed at the site in April 1996 and presents the results <br />' of the laboratory analyses The location of the site is illustrated on Figure 1 -Location Map A plan <br /> of the site is illustrated on Figure 2 - Site Plan <br />' The monitoring and sampling was performed in accordance with the San Joaquin County Public <br /> Health Services - Environmental Health Department (PHS-EHD) and the Central Valley Regional <br />' Water Quality Control Board(CVRWQCB) guidelines for the investigation of underground storage <br /> tank (UST) sites <br /> 2.0. BACKGROUND <br /> L21 SITE LOCATION <br /> The site area is located in an industrial park on the east side of Vanderbilt Circle, west of Highway <br /> 99, in an urban/industnal area of low topographic relief in Manteca, California (Figure 1) The site <br /> is located in Section 4, Township 2 South, Range 7 East, Mount Diablo Base and Meridian <br /> (MDB&M) A large warehouse, a small office building, a fenced storage yard, and a parking area are <br /> present on the site A municipal well is located on the property immediately west of the site A site <br /> plan depicting the structures and location of monitoring wells is given as Figure 2 <br /> 1 T <br /> 2 2 UNDERGROUND STORAGE TANK REMOVAL <br /> It is our understanding that two underground storage tanks (USTs) were removed from the site on <br /> 7 March 1991 one 10,000-gallon diesel UST and one 5,000-gallon gasoline UST Four soil samples <br />' were collected from beneath the USTs at the time of their removal The soil samples were analyzed <br /> for total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) and volatile <br /> aromatics (benzene, toluene, ethyl benzene and xylenes BTE&X) Analytical results of the soil <br /> samples indicated that an unauthorized release of both diesel and gasoline had occurred at the site <br /> Additional soil was removed from the former UST excavation in 1991 <br />