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' 17 January 2006 • AGE-NC Project No 97-0249 Page 2 of 8 ' Plan Addendum-October 1995, dated 14 October 1998,prepared by AGE and approved by the San Joaquin County Environmental Health Department (SJCEHD)by letter dated 21 December 1998 At the request of the CRWQCB,ground water monitoring events performed at the Three B's Truck Plaza site and the Flag City Chevron site (6421 Capitol Avenue) have been coordinated to occur concurrently,the Flag City Chevron ground water monitoring and analytical results are included in ' Appendix A 2 1 WELL MONITORING AND EVACUATION On 26 September 2005, depth to ground water was measured in each well from the top of the well ' casing to the nearest 0 01-foot utilizing a Solinst water level meter On 26 & 27 September 2005, a minimum of three casing-water volumes were evacuated (purged) ' from single-level monitoring wells MW-2, MW-3 and MW-6 utilizing dedicated, disposable polyethylene bailers Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using an Oakton water analyzer Field data logs are provided ' • in Appendix B Purged ground water was containerized in 55-gallon drums and stored on-site in an area lacking general public access ' On 26&27 September 2005,multi-level monitoring wells MW-7,MW-8,MW-9,MW-11,MW-13, MW-14 and MW-15 were purged by lowering and raising a3/8-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 A Watera-Hydro-Lift II pump equipped with a mechanical arm was utilized to surge each well with a polyethylene hose A minimum ofthree casing-water volumes were purged from each well Temperature,pH and conductivity were measured for stabilization at regular ' purge-volume intervals from each well using.the Oakton water analyzer Field data logs are included in Appendix B Multi-level well purged ground water was transferred to 55-gallon drums and stored on-site in an area lacking general public access 2 2 GROUND WATER SAMPLING After each well was purged,ground water levels were measured to verify the amount of ground water ' recharge Upon achieving at least 80% ground water recharge, samples were collected from each purged well utilizing the dedicated, disposable bailers or the above referenced Watera Hydro-Lift 11 pump system Ground water samples were transferred into 40-m1 EPA-approved volatile organic analysis (VOA)vials containing 0 5 ml 18% hydrochloric acid as a sample preservative and 1-liter amber bottles without sample preservative Care was taken to ensure that visible air bubbles were Advanced GeoEnviroamental,Inc 1