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F! <br /> Site Assessment Report,Site Conceptual Model,and Site Investigation Work Plan <br /> R&L Diesel Services,2417 West Lane, Stockton, California,95205 <br /> 1.0 INTRODUCTION <br /> I <br /> � _; r i <br /> 1.1 Project Description <br /> On behalf of R & I Diesel Service Inc. (R & L), Western Resource Management (WRM) has <br /> prepared this Site Assessment Report for submittal to the San Joaquin County Environmental <br /> Health Department (SJCEHD) and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB). <br /> 1 1.2 Site Location and Description <br /> i • R& L Diesel Services is located at 2417 West Lane in Stockton (Figure 1). The site is bounded <br /> by West Lane to the east, Klinger Road to the south, commercial property to the north, and <br /> Union Pacific rail lines to the west. The site is occupied by a diesel repair business. A small <br /> F (500-gallon).underground storage tank (UST) was closed in place in April 1988 where the. <br /> transmission shop is currently located. Two small (2001galfon)waste oil aboveground storage <br /> tanks are present in the steam cleaning area east of the transmission shop and engine parts <br /> building (Figure 2). <br /> 1.3 Site History and Previous Subsurface Investigations <br /> In April 1988, an underground used oil tank was closed in place by R & L Diesel Services by <br /> FJ1i filling with concrete. Soil around and under the tank was not sampled and analyzed at the time, <br /> but one soil sample was taken from under the UST in February 2007. The 2007 sampling <br /> revealed contamination from diesel and volatile organic compounds (VOCs), as reported in a <br /> June 2007 Report of investigation. <br /> In March 2008, Environeering, Inc. advanced four soil biorings using a Geoprobe© (push drill) <br /> F equipped rig to further define the lateral and vertical extent of petroleum compound <br /> contamination. Borings 81 and B2 were vertical borings drilled four feet north of the former UST <br /> and five feet west of the fill pipe for the former UST, respectively. B1 was advanced to 44 feet <br /> F below ground surface (bgs) and B2 was advanced to 48 feet bgs. Borings B3 and B4 were <br /> slant borings drilled 11 feet northwest of the fill pipe and 11 feet southwest of the fill pipe, <br /> respectively. B3 was drilled 24"from vertical to a total length of 32 feet (approximately 29 feet <br /> bgs) and B4 was drilled 18" from vertical to a total length of 24 feet (approximately 19 feet bgs). <br /> Results are discussed further in the Analytical Results and Site Conceptual Model (SCM) <br /> sections of this report. <br /> 1 : <br /> �i <br /> r <br /> �i <br />