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File No. 20-3978-0171 7 KL E IN F E LD ER November 22, 1996 4YB1 SCOPE OF WORK Drilling Permit and Work Plan Submittal Kleinfelder will collect soil samples from exploratory borings. The San Joaquin County Public Health Services Department Environmental Health Division (PHS/EHD) requires a workplan and boring permit application for exploratory soil borings drilled for site assessment purposes. The proposed soil/Hydropunch [IT' borings will require boring permits. Kleinfelder will also prepare a health and safety plan for use in the field. Drilling of Borings and Soil Sample Collection A total of ten soil borings will be drilled in the vicinity of the suspected former fuel/steam line (refer to Plate 2). The soil borings will be advanced using a truck-mounted drill rig equipped with 6-inch diameter hollow stem augers. Soil samples will be collected beginning at a depth of 5 feet and every 5 feet thereafter for logging purposes and potential chemical analysis. The borings will be drilled, logged, and sampled according to the protocol described in Attachment B. The soil samples collected will be field screened using an organic vapor detector as described in Attachment B, Section B-2.2. The borings will be advanced to a maximum depth of 15 to 35 feet below existing grade. Based upon previous investigations at the Spreckels property, groundwater is anticipated to be at a depth of 20 to 27 feet below grade. Groundwater samples will also be collected in three of the ten borings by means of the Hydropunch IIT" The soil borings will be closed in accordance with the protocol described in Attachment B. Soil cuttings generated while drilling will be placed on and covered by visqueen and stored on site pending chemical analysis. Water generated during steam cleaning of auger and/or equipment will be left on site in labeled 55-gallon drums. Analysis and disposal gfdrill cultings and steam cleaning water is not included in this proposal. Hand Auger Soil Sampling Twenty-five hand auger borings will be advanced to a depth of I foot at random locations spaced out over the proposed residential development to evaluate the presence of agricultural chemicals. A soil sample will be collected at an approximate depth of 6 inches below grade. A decontaminated hand auger will be used to advance each soil boring to the desired sampling depth. A soli sample well be collected at a depth of approximately 6 inches below grade. Soil samples are obtained by driving a 2-inch diameter by 6-inch long brass tube into the soil using a slide hammer. The brass tube is then removed from the boring and sealed with Teflon sheeting and plastic end caps. The sample is then labeled, and placed in an iced cooler pending transportation to the analytical laboratory under chain of 20-3978-01.WR71MR960268 Page 2 of 01996, Kleinfelder, Inc.