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GEOMATRIX <br /> Mr. Robert Mihalovich <br /> Chevron Environmental Management Company <br /> June 29, 2000 <br /> Page 2 <br /> utility locator to identify potential underground utilities at the proposed boring locations and <br /> notify Underground Service Alert (USA). A soil boring permit will be obtained from the San <br /> Joaquin County Public Health Services, Environmental Health Division. Borings will be <br /> advanced to a depth of 15 feet bgs 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. <br /> Geomatrix will collect groundwater samples from these borings. A temporary well consisting <br /> of 1-inch-diameter polyvinyl chloride (PVC)blank casing and 10 feet of 0.01-inch slot well <br /> screen will be placed in the boreholes. The grab groundwater samples will be collected with a <br /> disposable bailer and will be decanted into 40-milliliter acidified volatile organic analysis <br /> (VOA) vials and 1-liter amber bottles. Sample containers will be labeled, sealed in plastic <br /> bags, and stored in an ice-cooled chest. Following collection of groundwater samples, the <br /> casings will be removed and the boreholes will be,backfilled with cement grout. <br /> Geomatrix will submit the groundwater samples to a State of California certified analytical <br /> laboratory under Geomatrix chain-of-custody control. Groundwater samples will be analyzed <br /> for TPHd(C,a to C24 carbon range)using EPA Method 8015 Modified. The laboratory will <br /> perform TPHd analyses both with and without a silica gel preparation procedures on sample <br /> extracts prior to analysis. <br /> Pending subcontractor availability, the proposed field work will be scheduled within two <br /> weeks of RWQCB approval of this work plan and receipt of.an executed access agreement <br /> between CEMC and the new property owner, Mr. William Filios. Appropriate regulatory <br /> agencies will be notified at least 48 hours prior to implementation of field work or if there are <br /> any changes in the schedule. Please call Michael Keim at (510) 663-4107 if you have any <br /> questions. <br /> Sincerely, <br /> GEOMATRIX CONSULTANTS, INC. <br /> .f Ke <br /> �e <br /> Michael R. Keim Gary R. Foote, R.G. <br /> Project Scientist Senior Geologist <br /> MRK/GRF/pp <br /> I:\Doc Safe\6000s\6447.004\Mansfld WP 0600.doc <br /> Attachments: Figure 1 —Site Location Map <br /> Figure 2—Proposed Grab Groundwater Locations <br />