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Lod <br /> Preliminary Site Investigation and Evaluation Report <br /> November 1996 <br /> New Jerusalem School <br /> Lo <br /> 31400 South Koster Road <br /> Tracy, California <br /> L0. INTRODUCTION <br /> In accordance with the request of the New Jerusalem School District,Advanced GeoEnvironmental, <br /> Inc. (AGE) has prepared the enclosed Preliminary Investigation and Evaluation Report (PIER) for <br /> LN the site located at 31400 South Koster Road, Tracy, California (the site). The objective of the <br /> investigation was to determine the extent of the hydrocarbon-impacted soil and ground water at the <br /> site. The scope of work included the establishment of three soil probe borings and the collection of <br /> L. soil and ground water samples near the former underground storage tank (UST) area. The site and <br /> it's surroundings are illustrated in Figure 1 - Location Mal). Structures and probe boring locations <br /> are illustrated on Figure 2 - Site Plan. <br /> This report is prepared in accordance with San Joaquin County Public Health Services <br /> Environmental Health Division (PHS-EHD) and Central Valley,Regional Water Quality Control <br /> Board (CVRWQCB) guidelines for the investigation of UST sites. <br /> LM <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION AND DESCRIPTION <br /> The site is located in a commercial area of low topographic relief in southern San Joaquin County, <br /> 6. California, southeast of the City of Tracy. The property is presently occupied by New Jerusalem <br /> School. <br /> '— Water at the site is provided by an on-site domestic water well, located approximately 100 feet <br /> northeast of the former underground storage tank area. An irrigation well is located approximately <br /> 30 feet north of the former underground storage tank area. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> It is our understanding that a 1,000-gallon underground storage tank (UST) and a 350-gallon <br /> � gasoline UST were removed from the site in July 1989. Total petroleum hydrocarbons quantified <br /> as gasoline(TPH-g) and volatile aromatics (benzene, toluene, ethylbenzene and xylenes: BTE&X) <br /> ' were detected in soil sample collected beneath the 350-gallon UST following removal of the tank. <br /> 60 TPH-g was detected at 37,000 micrograms per kilogram (13,000 parts per billion: ppb or 37 parts <br /> per million: ppm). BTE&X compounds were detected at 130 ppb, 160 ppb, 680 ppb and 280 ppb, <br /> y <br />