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' GEOMATRIX <br /> HEALTH RISK SCREENING EVALUATION <br /> Surland Homes Property (Laurelbrook) <br /> Tracy, California <br /> ' 1.0 INTRODUCTION <br /> Geomatrix Consultants, Inc. (Geomatrix)has prepared this report on behalf of ChevronTexaco <br /> Environmental Management Company(ChevronTexaco) for the Surland Homes Property <br /> (Laurelbrook) located in Tracy, California(Figure 1). This report presents a brief background <br /> 1 discussion of the site and the surrounding area, a summary of the environmental investigations <br /> and results from the site, and the results of the human and ecological health screening evalua- <br /> tion associated with residual petroleum hydrocarbons in soil and groundwater. Additional <br /> details of past investigations are presented in the references cited at the end of this report. <br /> 2.0 BACKGROUND INFORMATION <br /> ChevronTexaco's former Old Valley Pipeline(OVP)was located adjacent to the Union Pacific <br /> 1 Railroad Company right-of-way which runs along the north side of West Byron Road (Figure <br /> 1). The OVP and the right-of-way are located along the southern edge of the Laurelbrook resi- <br /> dential subdivision which currently consists of more than 100 single-family homes over <br /> approximately 15 acres. The Laurelbrook subdivision is one of several tracts of land north and <br /> 1 south of the OVP and right-of-way that have been recently developed into residential homes. <br /> The former OVP transported heavy petroleum (crude and fuel oil) from Bakersfield to Rich- <br /> mond, California, from the early 1900s to the 1950s. Also present in the right-of-way was the <br /> former Associated Pipe Line (APL) Company's(predecessor to Texaco and now <br /> ' ChevronTexaco)pipeline that transmitted heavy crude from the Central Valley to the Bay Area <br /> from the early 1900s to the 1970s when it was decommissioned. <br /> An initial soil and groundwater investigation was conducted at the site in July 1998. The <br /> investigation included advancing eight soil borings (GB-1 through GB-8) and the collection <br /> ' and analyses of soil and grab groundwater samples. Analytical results for soil and groundwater <br /> samples are presented in Tables 1 and 2, respectively. Results of the investigation indicate that <br /> ' petroleum hydrocarbons are present in the site subsurface and that the lateral and vertical extent <br /> of petroleum hydrocarbon-affected soil is constrained. <br /> 1 <br /> 1:\Doc_Safe\6000s\6447.007ViRA\Swlaod HRA.doc 1 <br />