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! 0 <br /> GEOMATRIX <br /> SOIL AND GROUNDWATER INVESTIGATION <br /> AND SITE STATUS REPORT <br /> Surland Homes Property <br /> Tracy,California <br /> 1.0 INTRODUCTION <br /> This report presents results of field activities performed by Geomatrix Consultants, Inc. <br /> (Geomatrix), on behalf of Chevron Pipe Line Company(CPL), at the Surland Homes Property <br /> in Tracy, California(the site; Figure 1). Field activities included advancing eight soil borings <br /> and collecting grab groundwater samples from three of the borings. This work was performed <br /> in accordance with CPL'S 9 June 1998 work plan submitted to San Joaquin County Public <br /> Health Services (SJCPHS). The work plan was developed using the approach outlined in the <br /> "Technical Approach to Site Evaluation and Decision Making, Old Valley Pipelines Sites, <br /> Central Valley Region"(Technical Approach), which was approved by the California Regional <br /> IWater Quality Control Board—Central Valley Region(RWQCB) in March 1997 (Geomatrix, <br /> 1997). The purpose of this work was to gather data to determine whether groundwater at the <br /> site is affected by petroleum hydrocarbons and if petroleum hydrocarbons present in the site <br /> subsurface are a significant risk to human health. 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 /> I <br /> I2.0 BACKGROUND <br /> CPL's former Old Valley Pipeline(OVP)was located in a right-of-way along the southwest <br /> Iedge of the site. The former OVP transported heavy petroleum(crude and fuel oil) from <br /> Bakersfield to Richmond, California, from the early 1900s to the 1950s. <br /> The Surland Homes Property is located southeast and adjacent to a property known as the <br /> Dividend property(SJC APNs 238-020-10/13/14),which is shown on Figure 1. CPL has <br /> conducted investigations at the Dividend property due to the presence of residual OVP oil in <br /> 1 <br /> \\sf2\deptdam\Dat Safe\4780\surldrpt.dm 1 <br />