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GEOMATRIX <br /> SOIL AND GROUNDWATER INVESTIGATION REPORT <br /> AND HUMAN HEALTH SCREENING EVALUATION <br /> Burns Property (San Joaquin County APN 232-170-05) <br /> 1881 Rustan Road <br /> Tracy, California <br /> 1.0 INTRODUCTION <br /> tThis report presents results of field activities performed by Geomatrix Consultants,Inc. (Geomatrix), <br /> on behalf of Chevron Environmental Management Company(Chevron),at the Burns Property(San <br /> Joaquin County APN 232-170-05),located at 1881 Rustan Road in Tracy, California(the site;Figure <br /> 1). Field activities included advancing seven soil borings and collecting soil and grab groundwater <br /> samples from selected borings. This work was performed in accordance with Geomatrix's <br /> September 9, 1999 work plan,submitted to San Joaquin County Public Health Services(SJCPHS). <br /> The purpose of this work was to gather data to assess the lateral and vertical extent of petroleum <br /> hydrocarbon-affected soil at the site;to evaluate groundwater quality at the site;and to evaluate <br /> human health risk to confirm that the presence of petroleum hydrocarbons in the site subsurface does <br /> not pose an unacceptable risk to future receptors at the Site. Background information on the site,a <br /> summary of the activities performed and the results obtained,and our conclusions and <br /> recommendations regarding the site are presented below. <br /> 2.0 BACKGROUND <br /> Chevron's former Old Valley Pipeline(OVP)was located in the railroad right-of-way adjacent the <br /> northern boundary of the site. The former OVP transported heavy petroleum(crude and fuel oil) <br /> from Bakersfield to Richmond,California,from the early 1900s to the 1950s. <br /> On July 29, 1999 Earth Systems Consultants advanced six soil borings along the northern property <br /> boundary of the site(EB-1 through EB-6;Figure 2). Petroleum hydrocarbon-affected soil was <br /> observed in two of these borings-(EB-2 and EB-3). Soil samples were collected from boring EB-2 <br /> and EB-3 at depths of 11.5 and 11 feet below ground surface(bgs),respectively. No petroleum <br /> hydrocarbon-affected soil was observed in borings EB-1, EB4,EB-5,and EB-6 and therefore no soil <br /> samples were collected from these borings for analysis. Total petroleum hydrocarbons(TPH) <br /> quantified as crude oil(TPHc)and polynuclear aromatic hydrocarbons(PAHs)were detected in the <br /> . soil samples collected from borings EB-2 and EB-3 (Table 1). Based on these findings,Geomatrix <br /> performed an additional subsurface investigation,described below. <br /> \\SF3\DEPTDATA\DOC_SAFE\5000S\5650\13URNS\13URNS SOILGW RPT.DOC 1 <br />