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File No. 20-3978-01.W20 KLEINFELDER February 4, 1997 Kleinfelder has recently completed a review of plans for the Manteca Spreckels Plant provided to us by Spreckels Development Company. These plans were not available to us during the Phase I ESA referenced previously because their location and/or existence were apparently unknown. A review of a site plan prepared by Industrial Risk Insurers (plan 919229\901205) revealed the presence of a previously unidentified 2,000 gallon above ground diesel fuel storage tank (refer to Plate 2). Kleinfelder proposes to advance three Hydropunch soil borings at this location. Soil and groundwater samples will be collected and analyzed for the presence and concentration of Total Petroleum Hydrocarbons(TPH) extractable as diesel fuel and motor oil. SCOPE OF WORK Drilling Permit and Workplan Submittal Kleinfelder will collect soil and groundwater samples from Hydropunch borings advanced by truck mounted drill rig. 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 and/or to groundwater. The proposed exploratory Hydropunch borings will require permits, and a workplan will be submitted to the San Joaquin County PHS/EHD for review. Kleinfelder will also prepare a health and safety plan for use in the field. The health and safety plan will be included as part of the workplan. Drilling of Borings and Soil Sample Collection A total of 3 Hydropunch soil borings will be drilled in the vicinity of the former 2,000 gallon above ground diesel fuel storage tank (refer to Plate 2). The Hydropunch Il TI 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 five 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 20 feet or until groundwater is encountered. Based upon previous investigations at the Spreckels property, groundwater is anticipated to be at a depth of 10 to 20 feet below grade. Groundwater samples will be collected using a Hydropunch IIT"" sampling device as described in Attachment B, Section B- 2.4. 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 of drill cutting and steam cleaning water is not included in this proposal. 10-73978-01.W201207PE050 Page 2 of 01997, Kleinfelder, Inc.