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13 June 2001 <br /> • AGE-NC Project No 99-0637 <br /> Page 3 of 7 <br /> each well Purged ground water was containerized In properly labeled DOT-approved model 17H <br /> 55-gallon drums and was stored on-site Field sheets and data are included In Appendix B <br />' 2 6 MONITORING WELL PURGE PROCEDURES <br /> Ground water sampling of MW 1 through MW4 was conducted on 13 April 2001 For the sampling <br /> event, a Sohnst water level meter was used to measure the depth to ground water In the four wells <br /> relative to the tops of the well casings The ground water elevations and gradient were determined <br /> from these data (Table 1) <br /> After recording water level measurements, a disposable plastic bailer was used to purge monitoring <br /> wells MW 1 through MW4 of standing water Approximately 7 gallons of water (a minimum of 3 <br /> casing water-volumes per well)were removed from MW 1 through MW4 Groundwater temperature, <br /> pH and conductivity were measured at regular Intervals during purging In MW 1 through MW4 using <br /> an ICM water analyzer Purged ground water was containerized In properly labeled DOT-approved <br /> model 17H 55-gallon drums and was stored on-site Field sheets and data are Included in <br /> Appendix C <br />' 2 7 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred Into three 40-m1 VOA vials containing 0 5 ml 18%hydrochloric acid <br /> as a sample preservative and Into one 1-liter amber bottle without sample preservative After <br /> collection, the samples were properly labeled, placed In a chilled container and transported under <br />' chain-of-custody to MAI The samples were analyzed for <br /> • TPH-g and TPH-d In accordance with EPA Method 5030/8015 Modified and 3550/8015 <br />' Modified, <br /> • BTEX and MTBE In accordance with EPA Method 602/8020, and <br />' MTBE, DIPE, ETBE, TAME, TBA, ethylene dlbromlde (EDB) and 1,2-dichloroethane <br /> (1,2-DCA) in accordance with EPA Method 8260 Modified <br /> 2 8 WELL HEAD SURVEY <br /> IOn 10 April 2001, representatives of AGE surveyed a reference point on the top of ground water <br /> monitoring wells MW 1 through MW4 at the site to the nearest 0 01-foot relative to City of Manteca <br /> Advanced GeoEnvironmental,Inc <br /> 1 <br />