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1.0 INTRODUCTION <br /> This work plan specifies the work steps proposed to excavate impacted soil from the vicinity of the <br /> former 4,000-gallon underground storage tank (UST) and to manage the disposition of waste soil <br /> and water generated during the project. This plan has been prepared at the request of the San <br /> Joaquin County Public Health Services Environmental Health Division (PHS/EHD). <br /> 1.1 Site Description <br /> The subject site is located at 1040 Moffat Boulevard in the city of Ripon and county of San <br /> Joaquin, California (Figure 1). The site is an operating cement mixing plant, situated east of Jack <br /> Tone Road between Moffat Boulevard and State Highway 99. One, 4,000-gallon diesel UST was <br /> previously removed from the northwest part of the site and one, 500-gallon gasoline UST was <br /> abandoned on the northwest side of the plant building (Figure 2). <br /> 1.2 Previous Work <br /> On April 14, 1995, SEMCO removed one, 4,000-gallon, steel, diesel UST from the north side of <br /> the site. The PHSlEHD inspector noted "obvious signs of contamination and odor". Two soil <br /> samples (TK-N and TK-S) were collected from beneath the ends of the UST, at a depth of 12 feet <br /> below ground surface (bgs). The soil sample collected from beneath the north end of the UST <br /> (TK-N) contained 4,100 milligrams per kilogram (mg/kg) of Total Petroleum Hydrocarbons (TPH)- <br /> as-diesel and low concentrations of ethylbenzene (0.41 mg/kg) and xylenes (1.3 mglkg). <br /> Benzene, toluene, TPH-as-kerosene and TPH-as-motor oil were not detected in this soil sample. <br /> The soil sample collected from beneath the south end of the UST contained only 4.2 mg/kg of <br /> TPH-as-diesel. Benzene, toluene, ethylbenzene, xylenes (BTEX), TPH-as-kerosene, and TPH- <br /> as-motor oil were not detected in this soil sample. The results of these soil sample analyses are <br /> summarized in Table 1. <br /> In June 1996, under contract to Rajappan & Meyers, Inc., Michael Brandman Associates <br /> completed an Initial Site Assessment (ISA) for the Route 99/Jack Tone Road Interchange <br /> Reconstruction Project. The ISA concluded that the site required a Preliminary Site Investigation <br /> (PSI) to evaluate potential soil contamination in the vicinity of the interchange. Subsequently, <br /> Rajappan & Meyers, Inc. contracted with URS Greiner, Inc. to complete the PSI. <br /> 2 <br />