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5 <br /> t <br /> 23 December 1998 <br /> AGE-NC Project No 96-0235 <br /> Page 3 of 7 <br />' 24 SURVEYING <br /> On 24 September 1998, the casing elevations of the new wells and MW-2 were surveyed to the <br />' nearest 0 01-foot relative to mean sea level as established at a City of Stockton Bench Mark (Table <br /> 2) Surveying was performed by Baumback & Piazza, Inc The survey report sheet is included in <br /> Appendix A Monitoring wells MW-1, MW-3, MW-4 and MW-5 were previously surveyed relative <br />' to mean sea level <br />' 2 5 MONITORING WELL DEVELOPMENT <br /> Each well was surged during installation of the sand packs During monitoring well purge <br />' procedures, additional water was removed from the new wells (Section 2 6 ) <br />' 2 6 MONITORING WELL PURGE PROCEDURES <br /> On 31 August 1998, a Solinst water level meter was used to measure the depth to ground water in <br /> each well relative to the tops of the well casings The ground water elevations and gradient were <br /> determined from these data(Table 1) <br />' After recording water level measurements, a PVC bailer was used to remove sediments from each <br /> of the new monitoring wells A two-stage submersible pump was then used to purge each monitoring <br />' well of standing water and to develop the new wells Approximately 6 to 40 gallons of water were <br /> removed from each well Ground water temperature, pH and conductivity were measured at regular <br /> intervals during purging using an ICM water analyzer Due to time constraints, monitoring,well <br />' MW-7 was purged and sampled on 01 September 1998 Field sheets and data are included in <br /> Appendix C Purged water was stored on-site in labeled, 55-gallon DOT-approved drums <br /> 27 COLLECTION OF GROUND WATER SAMPLES <br />' Water samples were collected from each well using new disposable plastic bailers Each water <br /> sample was transferred into 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid as a sample <br /> preservative and into I-liter amber bottles without preservative After collection, the samples were <br /> properly labeled, placed in a chilled container and transported under,chain-of-custody to MAI Each <br /> sample was analyzed for <br /> . TPH-g and TPH-d in accordance with EPA Methods 5030/8015m, <br /> Advanced GeoEnveronmental,Inc <br />