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11} 1 25 January 2005 AGE-NC Project No 99-0559 Page 2of10 Interim ground water remediation by ground water extraction was initiated at the site on 20 May 2003,in accordance with procedures outlined in the AGE-prepared Interim Remediation and Site Assessment Work Plan, dated 25 January 2001 2.0. GROUND WATER MONITORING AND SAMPLING Ground water monitoring and sampling were performed on 14 December 2004 The work was performed in accordance with guidelines established by the California Regional Water Quality Control Board (CRWQCB) - CentraI Valley Division for subsurface investigation of underground storage tank (UST) sites, and with the San Joaquin County Environmental Health Department (EHD)-approved Preliminary Site Assessment Work Plan, dated 12 October 1999, and Interim Remediation and Site Assessment Work Plan, date 25 January 2001, both prepared by AGE 2 1 WELL MONITORING AND EVACUATION Depth to ground water was measured in wells MW-I through MW-4 and well chambers A through E of the multi-level wells MW-5 through MW-7 from the top of the well casings to the nearest 0 01-foot, utilizing a Solinist water level meter, ground water elevations and gradients in this report are based on the measured depths Ground water was measurable in single-level wells MW-1 through MW-3, but free product was encountered, the data from these wells was considered unreconcilable with the multi-level monitoring wells After ground water depth measurements, well chambers 5B, 5C, 5D, 5E, 6B, 6C, 6E, 7B and 7E of the multi-level monitoring wells were purged by lowering and raising a 318-inch outer diameter, length-discrete polyethylene hose equipped with a ball-valve water tip through the top chambers into the specific water-charged screened section The A level well chambers and MW-4 were not purged due to lack of water, well chambers 6D 7C and 7D were not purged due tubing restrictions within each individual chamber Approximately 1 2 to 4 gallons of ground water (a minimum of three casing-water volumes per well) were removed from the multi-Ievel monitoring well levels Temperature,pH and conductivity were measured for stabilization at regular purge-volume intervals during monitoring using an Oakton water analyzer, field data and logs are included in Appendix B Purged ground water was containerized in 55-gallon drums and processed on-site for discharge under permit Dedicated, disposable polyethylene bailers were utilized to purge standing free product and water from wells MW-1 through MW-3 Advanced GeoEnvironmental,Inc