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Preliminary Site Investigation Work Plan - July 1997 <br /> RENTAL MACHINERY COMPANY, INC. <br /> 1821 East Charter Way, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Kit Bennett,Advanced GeoEnvironmental, Inc. (AGE) has <br /> prepared the enclosed Preliminary Site Investigation Work Plan for the collection of soil samples <br /> beneath the former underground storage tank (UST) area at, 1821 East Charter Way, Stockton, <br /> California. <br /> The scope of work initially includes the advancement of one soil probing within the former UST area <br /> and collection of soil and ground water samples. The location of the site is illustrated in Figure I - . <br /> Location Map (USGS 7.5 Minute Topographic Series: Stockton East Quadrangle, Photorevised <br /> 1987). A plan of the site is illustrated on Figure 2 -Site Plan. <br /> This Work Plan 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 /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION AND DESCRIPTION <br /> The site is located in a flat,commercial area of east Stockton, California,at an approximate elevation <br /> of 25 feet above mean sea level. The site is bounded on the north by Mormon Slough, on the south <br /> by Charter Way, and on the east and west by industrial properties. The property was formerly <br /> occupied by Rental Machinery Company, Inc. and is presently unoccupied. <br /> 2.2. UNDERGROUND STORAGE TANK REMOVAL <br /> One 5,000-gallon diesel UST and associated piping were removed from the site in May 1990. Two <br /> soil samples were collected from beneath the UST: one sample was collected each from the north <br /> and south ends of the excavation floor. <br /> The samples were transported to a State-certified laboratory and analyzed for total petroleum <br /> hydrocarbons quantified as diesel (TPH-d) and volatile aromatics (benzene,toluene, ethylbenzene <br /> and xylenes: BTE&X). TPH-d was detected in the sample collected from the south end of the <br /> excavation at 8,080 parts per million(ppm); ethylbenzene and xylenes were detected in the same <br /> sample at concentrations of 9.61 and 84.14 ppm, respectively. <br /> Advanced GeoEnvironmental,Inc. <br />