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Civic Center Square <br /> 2444 Main Street, Suite 215 <br /> Fresno, California 93721-2734 <br /> (209]264-2535 - FAX(209) 264-7431 GEOMATRIX <br /> 11 December 1996 <br /> Project C3499 <br /> Ms. Katie Hower YPSTYZI <br /> Chevron Pipe Line Company <br /> 4000 Executive Parkway, Suite 400 DEC 3 0 1996 <br /> Bishop Ranch 8 <br /> San Ramon, California 94583-0959 ENVIRONMENTAL HEALTH <br /> PERMIT/SERVICES <br /> Subject: Soil Assessment Results <br /> Hanson Property (APN 252-040-02) <br /> 7750 West Schulte Road <br /> Tracy,California <br /> Dear Ms. Hower: <br /> Geomatrix Consultants, Inc. (Geomatrix) is pleased to present the results of soil sampling performed on <br /> behalf of Chevron Pipe Line Company (CPL) at the Hanson property (San Joaquin County Assessor <br /> Parcel Number [APN] 252-040-02) located at 7750 West Schulte Road in Tracy, California (Figure 1). <br /> The assessment was described in the Geomatrix 3 June 1996 letter work plan "Hanson Property <br /> (APN 252-040-02), 7750 Schulte Road, Tracy, California." The work plan was verbally approved by <br /> the San Joaquin County Public Health Services -Environmental Health Division on 2 August 1996. <br /> Background <br /> CPL's former Wait-Mendota-Richmond pipeline system was located along the northern portion of the <br /> Hanson property (Figure 2). These pipelines were used to carry crude oil and Bunker C oil from the <br /> early 1900s to the late 1950s. A soil assessment was performed along the former pipeline by Aqua <br /> Science Engineers, In. (ASE) on 5 May 1995. The results of the assessment were reported in the ASE <br /> 24 May 1995 "Project Report, Subsurface Soil Assessment, ASE Job No. 2857, Schulte and Chrisman <br /> Roads,Tracy, California" (ASE, 1995). <br /> The soil assessment consisted of excavating shallow test pits every 100 feet along the former pipeline <br /> location, evaluating the soil beneath the former pipeline for the presence of discolored soil an <br /> petroleum hydrocarbon odor, and collecting a soil sample from the base of each test pit for laboratory <br /> analysis. The pipeline has been removed but was evidenced by the remains of the tar-like coating that <br /> was used to wrap the pipe; the coating material was observed at a depth of 3 feet below ground surface <br /> (bgs). Discolored soil and petroleum hydrocarbon odor were not observed in the soil beneath the <br /> former pipeline. Soil samples collected at a depth of 4 feet bgs in each excavation were analyzed for <br /> total oil and grease (TOG) and total recoverable petroleum hydrocarbons (TRPH) using EPA Methods <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists,and Environmental Scientists <br /> 1APROIEC TNO49rii4YY-17.DOC <br />