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20 September 2004 <br />AGE-NC Project No 97-0311 <br />Page 3 of 6 <br />Monitoring wells MW-1 through MW-4 were developed utilizing a stainless steel hand bailer and <br />a Wattera inertial lift-pump and dedicated 5/8- inch tubing. Ground water was purged from each <br />monitoring well until ground water was visually free of large quantities of sediment; between 14 and <br />20 gallons of water were removed from the wells. Temperature, pH and conductivity were measured <br />for stabilization at regular purge-volume intervals during monitoring using an Oakton water <br />analyzer; field data and logs are included in Appendix C. Purged ground water was containerized <br />in properly labeled Department of Transportation (DOT)-approved model 17H 55-gallon drums and <br />stored on-site. <br />Prior to ground water sampling, the ground water level in each well was measured to ensure that the <br />well achieved a minimum of 80 percent recharge. Following depth measurement, ground water <br />samples were collected from wells MW-1 through MW-4 utilizing 5/8-inch diameter polyethylene <br />tubing. The ground water samples were transferred into a one-liter container and three 40-ml EPA- <br />approved volatile organic analysis (VOA) vials containing 0.5 ml 18% hydrochloric acid as a sample <br />preservative; care was taken to ensure that visible air bubbles were not present in the vials after <br />filling and capping. Ground water sample containers were properly labeled, placed in a chilled <br />container and transported under chain of custody protocol to Cal Tech Environmental Laboratories <br />(CTEL), a California Department of Health Services-certified laboratory, for analysis. The ground <br />water samples were analyzed for the following: <br />TPH-g, TPH-d, TPH-ss and TPH-o in accordance with EPA Method 8015 Modified; <br />VOCs and fuel additives in accordance with EPA Method 8260 Modified. <br />2.6. MONITORING WELL ELEVATION SURVEY <br />On 03 September 2004, a California state-licensed survey engineer from Baumbach & Piazza, Inc. <br />surveyed the elevation at the top of the well casing of monitoring wells MW-1 through MW-4 to the <br />nearest 0.01-foot relative to City of Lodi Bench Mark #733 at 48.48 feet above mean sea level (msl). <br />The results of the monitoring well survey are contained in Table 1. The surveying report (Baumbach <br />& Piazza, Inc.) is presented in Appendix D. <br />3.0. FINDINGS <br />Soil descriptions were utilized to construct the site geological model; laboratory analysis of soil <br />samples were utilized to assess the solvent or petroleum hydrocarbon-impact on soil and laboratory <br />analysis of soil samples were utilized to assess any solvent-impact on ground water. <br />Advanced GeoEnvironmental, Inc.