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File No. 20-3978-01.W I I ■ KLEINFELDER December 16, 1996 TECHNICAL APPROACH FOR FIELD ACTIVITIES Drilling Permit and Work Plan Submittal Kleinfelder will collect soil samples and Hydropunch IIT' water samples from 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 IITm borings will require boring permits. Additionally, because closure will be requested for the former UST locations, a workplan will be submitted to the San Joaquin County EHD for review. Kleinfelder will also prepare a health and safety plan for use in the field. Drilling of Borings and Soil Sample Collection A total of three Hydropunch IIT" soil borings and seven exploratory soil borings will be drilled in the vicinity of the former underground storage tanks (refer to Plates 2-4). The three Hydropunch JIT" borings will be advanced through the center of each former UST location (B- I, B-5, and B-8). The exploratory borings (B-2 through B-4, B-6, B-7, B-9 and B-10) will be advanced at the anticipated piping and/or dispenser locations. The former UST locations were established by reviewing existing site plans, Sanborn Fire Insurance Maps and our Phase I ESA site reconnaissance. In order to drill in the location of the historical UST at the Auto Slab concrete cutting will be required. The Hydropunch IITI 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 25 feet or until groundwater is encountered. 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 be collected using a Hydropunch II sampling device as described in Attachment B, Section B-2.4. 20-2978-01.W/1/MP960/47 Page 3 of 01996. Kleinfelder, /n c.