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C7M&9kAITCdMtis/nc. • • Paget Work Plan George's Service Project No.425.2 August 16, 2004 In the letter dated June 28, 2004, Nuel C. Henderson, Jr., R.G., San Joaquin County Environmental Health Department (EHD) reviewed and accepted the proposed method of in situ oxidation remedial method in the Feasibility study dated 28 April 2004, and asked us to prepare and submit the work plan for Bench Scale Testing. This report is the work plan for Bench Scale Testing for in situ oxidation as a remedial method. 2.0 PURPOSE OF STUDY The purpose of this following proposed bench scale study is to evaluate the effects of injecting ozone into the aquifer materials on the mobilization of metals into solution. This study will follow the requirements given by Central Valley Regional Water Quality Control Board (CVRWQCB), which is attached in Appendix A. The bench scale study will help to determine the effectiveness of this in situ remedial process and its cost effectiveness. 3.0 SAMPLING PROCEDURE The soil samples will be taken from Bench Scale Sampling (BSS) location as shown in Figure 2. The cross section of the site is shown is Figure 3. One sample will be collected from the upper clay unit at 10 to 12 ft bgs and the other sample will be collected from the upper sandy unit at 20 to 22 ft bgs. These samples will be mixed together in equal proportions to make 50:50 ratio. This location for sampling will provide enough room for drilling away from other subsurface influences such as closely spaced well and soil excavation. Soil samples will be collected using a licensed driller. All soil core samples will be sealed with Teflon, capped with end caps, marked for vertical orientation, labeled and placed in a chilled cooler for transport to the laboratory following Chain of Custody protocol. 4.0 BENCH SCALE TEST LABORATORY The soil and water samples will be sent to the SECOR International Inc. The work plan from SECOR is appended in Appendix B with cost table for the bench scale study. 4.1. Soil Laboratory Analyses SECOR International Inc. will analyze the soil samples and will prepare a study report evaluating the data in light of the objectives stated in work plan (Appendix B).