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100 Pine Street. 10th Floor <br /> San Francisco, CA 94111 GEOMATRIX <br /> C415] 434-9400 • FAX C4151 434-1365 <br /> 'R s <br /> February 16, 1999 R <br /> Project 5223 FEB 18 1999 <br /> �N4riht�.,a�:. ..:yTAL hiEAL'I h- <br /> Mr. Michael J. Infurna, Jr. PERMI'I. SERVICES <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Soil and Groundwater Sampling Work Plan <br /> Mansfield Property <br /> Byron Road <br /> Tracy, California <br /> Dear Mr. Infurna: <br /> Geomatrix Consultants, Inc. (Geomatrix)have prepared this workplan on behalf of Chevron <br /> Pipe Line Company(CPL) for work to be conducted at the Mansfield Property(the site; <br /> Figure 1). The proposed scope of work was developed based on the results of an initial <br /> investigation conducted at the site by Geomatrix on 22 October 1998. A soil boring(B-1) <br /> advanced as part of this investigation indicates that petroleum hydrocarbons are present in site <br /> soil. The objective of this investigation is to further assess the presence of petroleum-affected <br /> soil in the vicinity of B-1 and along the southern edge of the property and the possible <br /> presence of petroleum-affected groundwater at the site that may be associated with CPL'S Old <br /> Valley Pipeline (OVP). The proposed scope of work is described below. <br /> Geomatrix will contract with Precision Sampling, Inc. to advance approximately ten soil <br /> borings at the site. Approximately 5 borings will be advanced to assess the lateral and vertical <br /> extent of petroleum hydrocarbon affected soil in the vicinity of boring B-1, the number of <br /> borings required to do this will be agreed upon in the field by Geomatrix and the San Joaquin <br /> County Public Health Services (SJCPHS). Five additional borings will be advanced at <br /> approximately 200-foot intervals to the northwest of boring B-1 to assess the possible presence <br /> of petroleum hydrocarbon affected soil along the southern edge of the site(Figure 2). Prior to <br /> field activities, Geomatrix will contract a private utility locator to identify potential <br /> underground utilities at proposed boring locations and notifying Underground Service Alert <br /> (USA). Borings will be advanced using a hydraulically driven, direct push core barrel and <br /> drive sampler. Soil recovered from continuous cores will be examined and logged in <br /> accordance with the Unified Soil Classification System (USCS) as presented in the American <br /> Society of Testing and Materials Standard D2488-90. One soil sample will be collected for <br /> chemical analyses from each boring at either the area of soil core most visibly affected <br /> petroleum hydrocarbons, or from just above the groundwater table if petroleum hydrocarbons <br /> Geomatrix Consultants, Inc. <br /> Engineers, Geologists, and Environmental Scientists <br />