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100 Pine Street. 1 Oth Floor <br /> San Francisco. CA 94111 GEOMATRIX <br /> (41 5) 434-9400 • FAX C415) 434-1365 <br /> 8 December 1997 <br /> Project 4440 <br /> Ms. Katie Hower <br /> Chevron Pipe Line Company <br /> P.O. Box 5059 <br /> San Ramon, California 94583 <br /> Subject: Cintra Property Investigation <br /> Byron Road <br /> Tracy, California <br /> Dear Ms. Hower: <br /> This report presents results of a soil and groundwater investigation performed by <br /> Geomatrix Consultants,Inc. (Geomatrix)along the southern edge of the Cintra Property <br /> located in Tracy, California(the site; Figure 1). Geomatrix performed the work on behalf <br /> of Chevron Pipe Line Company(CPL)at the request of the San Joaquin County Public <br /> Health Services, Environmental Health Division(SJCPHS). The objective of the <br /> investigation was to assess the possible presence of petroleum hydrocarbons in this area of <br /> the site subsurface that may be associated with CPL'S Old Valley Pipeline. The field <br /> methods and results of the investigation are described below. <br /> FIELD METHODS <br /> Three soil borings(B-1 through B-3)were advanced at the site by Precision Sampling, <br /> Inc. of San Rafael, California,under the supervision of Geomatrix on 21 November 1997 <br /> (Figure 2). Mr. Michael Infurna of the SJCPHS was present at the site and observed all <br /> boring and sampling activities. Prior to boring activities, Geomatrix notified Underground <br /> Service Alert(USA); had the soil boring locations cleared for underground utilities by <br /> Cruz Brothers Sub-Surface Locators, Inc. of Milpitas,California; and obtained a soil <br /> boring permit from the SJCPHS. <br /> All drilling and soil sampling equipment was steam cleaned prior to use. The borings <br /> were advanced using a hydraulically driven core barrel and drive sampler to depths of <br /> approximately 16 feet below ground surface(bgs). The core from each boring was logged <br /> by an on-site Geomatrix geologist; borings logs are included as Attachment 1. Geomatrix <br /> collected several soil samples from each soil boring for possible chemical analyses. Soil <br /> samples were collected in brass sleeves sealed with Teflon sheets,end caps, and tape. <br /> The soil sample analyzed from each boring was selected from approximately six inches <br /> above the water table(at depths of 10, 8, and 11 feet bgs in borings B-1,B-2, and B-3, <br /> respectively). <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br /> \ ril. .:... �� <br />