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1.0 Introduction <br /> This report presents the results of assessment activities conducted b Shaw Environmental Inc <br /> P Y <br /> (Shaw) on behalf of Pacific Bell at its facility located at 10 East 12'x' Street, Tracy, California <br /> (Figure 1) The additional activities were required by the San Joaquin County Environmental <br /> Health Department (SJCEHD) to evaluate the petroleum hydrocarbon impact encountered during <br /> the removal of a 2,000-gallon diesel underground storage tank(UST) in March 2002 <br /> The investigation involved the advancement of six direct push soil borings and the collection and <br />' analysis of soil and grab groundwater samples Field activities presented in this report were <br /> performed by Shaw on September 19, 2002 <br /> 1.1 Site Description <br />' The Pacific Bell property is located in a predominately residential part of Tracy, California A <br /> one-story switching facility/office is located on the western portion of the site The eastern <br />' portion of the site was previously used for parking of Pacific Bell fleet vehicles In September <br /> 2002, the eastern portion of the site was being developed for expansion of the site building <br />' 1.2 Site Background <br /> In February 2002, a 500-gallon heating oil UST was encountered on the southeastern portion of <br />' the site during grading The UST was subsequently removed Petroleum hydrocarbon analytes <br /> were not detected in a soil sample collected from the base of the UST excavation (IT, 2002a) <br /> 1 ' <br /> In March 2002, a 2,000-gallon diesel UST was removed The tank had contained fuel for an <br />' emergency backup power generator and was later replaced with an 8,000-gallon UST that was <br /> located further east of the site Groundwater was encountered at a depth of approximately 12 feet <br />' below surface grade (bsg) during removal of the 2,000-gallon UST Petroleum hydrocarbon <br /> analytes were not detected in soil samples collected from the excavation floor and south end <br />' The soil sample collected from the north end of the excavation contained 1 3 parts per million <br /> (ppm) of total petroleum hydrocarbons as diesel (TPH-D) A groundwater sample collected from <br /> the excavation contained 130 parts per billion(ppb) of TPH-D (IT, 2002b) Soil sample <br />' analytical data is included in Table 1 and depicted in Figure 3 Groundwater sample analytical <br /> data is included in Table 2 and depicted in Figure 4 <br /> 1 <br />' CNCD\l 1-20-0210 SHAREWSW2-0086 doe 1 <br /> 1 <br />