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' Mr Harlan Knoll September 20, 1993 Page 6 ' product, they will be developed by surging with a vented surge block and by pumping until approximately four to five well volumes are purged and stable field readings of pH, specific conductivity, and temperature are obtained After groundwater returns to ' approximately 90% of static groundwater elevation, the well will be sampled using a clean bailer, the groundwater will be transferred slowly through bailer ports to laboratory ' sterilized glass receptacles and transported directly to the laboratory under a Chain of Custody Groundwater samples collected from the existing well will be analyzed for ' TPHg and TPHd using EPA method 8015 (modified), for BTEX using EPA method 602, for chlorinated hydrocarbons using EPA 601, for total oil and grease, and for priority ' y metals Groundwater samples collected from the new wells will be analyzed for TPHd and BTEX ' Purged groundwater will be stored onsite in labeled 55-gal drums Disposal options for this water and the driller's rinse water depend on the results of laboratory analyses Responsibility for disposal belongs to the site owner, however, RFA can take appropriate measures to responsibly dispose of the water upon request by the owner The proposed investigation will follow protocols approved by the San Joaquin County Environmental Health Department (SJEHD) and the Central Valley Regional Water Quality Control Board (CVRWQCB) The proposed wells will be constructed and borings will be drilled after appropriate permits are issued by SJEHD SCHEDULE I We plan to begin work immediately after this work plan is approved and the well permits are issued by SJEHD A written report of our findings should be completed in approximately four to six weeks following completion of the field work Evaluation and recommendations for further site remediation will be based on the results of our preliminary investigation ROGER I 323-001 scw FDT T ASSOCIATES