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/A&=— <br /> GEOMATRIX <br /> RESULTS OF ADDITIONAL SOIL AND GROUNDWATER <br /> INVESTIGATIONS AND REQUEST FOR SITE CLOSURE <br /> Hanson Property <br /> 7750 Schulte Road <br /> Tracy, California <br /> 1.0 INTRODUCTION <br /> Geomatrix Consultants, Inc. (Geomatrix) has prepared this report summarizing the results of <br /> additional soil and groundwater investigations performed on behalf of Chevron Pipe Line <br /> Company (CPL) at the Hanson Property(San Joaquin County Assessor Parcel Number [APN] <br /> 252-040-02) at 7750 West Schulte Road in Tracy, California(Figure 1). These additional soil <br /> and groundwater assessments were requested verbally of CPL by the San Joaquin County <br /> Public Health Services, Environmental Health Division(PHS-EHD) on 3 March 1997 and were <br /> conducted in accordance with a 12 March 1997 letter/work plan from CPL to PHS-EHD. <br /> These investigations were conducted to evaluate the presence of petroleum hydrocarbons in the <br /> subsurface adjacent to CPL'S former Wait-Mendota-Richmond Pipeline ("Old Valley Lines"), <br /> located adjacent to the north Hanson Property boundary. Field activities conducted by <br /> Geomatrix included advancing and sampling three soil borings; obtaining a grab groundwater <br /> monitoring sample; and installing, developing, and sampling one temporary groundwater <br /> monitoring well. Presented herein is a brief summary of previous investigations, results of data <br /> obtained during the subject investigations, and conclusions and recommendations regarding site <br /> closure. <br /> 2.0 BACKGROUND <br /> A segment of CPL's former Wait-Mendota-Richmond Pipeline ("Old Valley Pipeline") system <br /> was located in the right-of-way along the northern boundary of the Hanson Property(Figure 2). <br /> According to CPL records, this section of the pipeline system was used to carry San Joaquin <br /> Valley crude oil and Bunker C oil from the early 1900s to the late 1950s. The pipeline has <br /> since been removed from the right-of-way adjacent to the Hanson Property. <br /> I:\WPDOCS\4097\ADDLR4VB.DOC 1 <br />