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18 June 2004 <br /> AGE-NC Project No 99-0559 <br /> Page 2 of 8 <br /> Ground water remediation was Initiated during May 2004 in accordance with procedures outlined <br /> in Interim Remediation and Site Assessment Work Plan, date 25 January 2001 Additional reporting <br /> for the progress of the ground water extraction system is forthcoming <br /> 2.0. PROCEDURES <br /> Ground water monitoring and sampling were performed between 22 and 23 March 2004 The work <br /> was performed in accordance with guidelines established by the California Regional Water Quality <br /> Control Board (CRWQCB) - Central Valley Division for subsurface investigation of underground <br /> storage tank (UST) sites, and with the San Joaquin County Environmental Health Department <br /> (EHD)-approved Preliminary Site Assessment Work Plan, dated 12 October 1999, and Interim <br /> Remediation and Site Assessment Work Plan, date 25 January 2001, both prepared by AGE <br /> 2 1 WELL MONITORING AND EVACUATION <br /> During the first quarter monitoring events,on 23 March 2004,depth to ground water was measured <br /> in wells MW-1 through MW-8E from the top of the well casings to the nearest 0 01-foot utilizing <br /> a Slope water level meter, ground water elevations and gradients in this report are based on the <br /> March depth measurements <br /> After ground-water depth measurements, dedicated, disposable polyethylene bailers were utilized <br /> to purge standing water from wells MW-1 through MW-4 Approximately 3 75 to 4 gallons of water <br /> and free product(a minimum of three casing water-volumes per well)were removed from the wells, <br /> and approximately 3/4-Inch of free product was measured and removed from well MW-2 <br /> The well chambers of the multi-level monitoring wells MW-5 through MW-8 were purged by <br /> lowering and raising a 318-inch outer diameter, length-discrete polyethylene hose equipped with a <br /> ball-valve water tip through the top chambers into the specific water-charged screened section <br /> Approximately 0 3 to 4 25 gallons of ground water(a minimum of three casing-water volumes per <br /> well),when available,were removed from the multi-level monitoring well levels A,B, C, D and E <br /> Well MW-6E was only purged of 2 gallons of water prior to sampling <br /> During the monitoring event, temperature, pH and conductivity were measured for stabilization at <br /> regular purge-volume intervals using an Oakton water analyzer Field data and logs are included with <br /> Appendix A Purged ground water was contamenzed in 55-gallon drums and process on-site for <br /> discharged under permit <br /> Advanced GeoEnvi ron mental,Inc <br />