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L SWI, `n/ <br /> 1.0 INTRODUCTION <br /> At the request and authorization of the property owner, BSK & Associates (BSK) has <br /> prepared this Workplan for investigation of petroleum hydrocarbons in soil and groundwater <br /> from a former on-site underground fuel storage tank (UST). The contamination was revealed <br /> by sampling and chemical analyses during the removal of an UST from the property, and <br /> 16W during an ensuing investigation of the site. Figure 1 presents a Vicinity Map of the site. <br /> . Site information is as follows: <br /> Site Location: 26500 Nowell Road <br /> Thornton, California 95686 <br /> Tank Owner: Ms. Pamela Lopez <br /> � Contact: Mr. Robert Holiday <br /> P.Q. Box 393 <br /> Thornton, California 95686 <br /> (209) 794-0205 <br /> 1.1 Project History <br /> One 500-gallon gasoline tank was exhumed and removed from the site on October 9, 1989. <br /> Chemical analyses were performed on a soil sample obtained from beneath the UST. Results <br /> +� of the analyses for Total Petroleum Hydrocarbons as Gasoline (TPH-G) and gasoline <br /> constituents Benzene, Toluene, Ethylbenzene & Xylenes (BTEX) indicated that a release of <br /> petroleum hydrocarbons had occurred. <br /> a. <br /> In November 1994, three soil borings were drilled and sampled on the Lopez property by <br /> RAH Environmental, Inc. (see Figure 2, Site Plan). Two of the borings were drilled in <br /> conjunction with a UST investigation of the adjacent Tri-Valley Growers property, and one <br /> boring was drilled and sampled to evaluate the vertical extent of impacted soil in the vicinity <br /> of the former Lopez UST. The boring drilled to evaluate the vertical extent of the release <br /> from the Lopez UST was advanced through the former UST location. Chemical analyses of <br /> soil samples obtained from the boring indicated that petroleum hydrocarbons were present to <br /> below the groundwater surface. Groundwater, sampled through the hollow-stem auger, was <br /> also analyzed and results of analyses suggest that groundater in the vicinity of the UST had <br /> been impacted by a release of petroleum hydrocarbons. Results of analyses on soil and <br /> groundwater samples from the other two borings resulted in the following conclusion from <br /> RAH Environmental: <br /> LW "The presence of soil and water hydrocarbon contamination in SBA, and the lack of <br /> soil contamination and the much lower level of water contamination in SB4, indicate <br /> that the contamination found in SBA most probably results from the former gasoline <br /> 1, storage tank." <br /> Woexplm-07400008-May,1995 <br /> 4P+ <br /> $r ASSOGIc1teS <br /> 1� <br />