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r 29 March 2002 " AGE-NC Proj ect No. 99-0637 1 .f Page 3 of 6 from wells MW5 and MW6 and 25 gallons of water were remo�rcd from MW7. Purged ground water was containerized in.properly labeled"DOT=approved model 17H 55-gallon drums and was stored on-site. Field sheets and data are included in Appendix B. 2.6. MONITORING WELL PURGE PROCEDURES. Ground water sampling of wells MW 1°through MW7 was conducted on 31 January 2002. For the sampling event, a.Solinst water-level meter was used to.measure the,Aepth to ground water in the - seven wells relative to the tops of the well casings. The ground water elevations and.gradient we're determined from these data(Table 1). After recordingwater level measurements;disposable plastic bailers were used to purge monitoring wells MW through MW7 of-standing water. Approximately•7 gallons of water (a minimum of 3 casing water-volumes per well)were removed from MW I through MW7.Ground water temperature, pH and conductivity were measured at regular intervals during purging in MW I through MW7 using ' an Oakton water analyzer. Purged ground water was, containerized in properly labeled �.. DOT-approved model 17H 55-gallon drum_s-and* stored on-site. Field .sheets and data are . included in Appendix C. - 2.7. COLLECTION OF GROUND WATER SAMPLES Water samples:were collected from each purged'well using new disposable.plastic bailers:Each water sample was transferred into three 40-m1 VOA vials containing 0.5 nil 18%hydrochloric acid as a sample preservative and into .one, I-liter amber`bottle without sample preservative. After collection, the samples were properly.labeled, placed in a chilled-container and transported under f chain-of=custody'to"MAL'The samples were analyzed for: TPH-g and TPH-d in accordance with EPA Method 8015 Modified; • BTEX in accordance with.EPA Method.8020;_and : - • MTBE, DIPE, ETBE, TAME, TBA, EDB and 1,2-DCA in accordance with EPA Method 8260 Modified. 2.8. WELL HEAD. SURVEY .. On 05 March 2002, a California state licensed survey engineer from Baumbach & Piazza, Inc. . .surveyed the elevation of a reference point on"the well heads of ground water monitoring wells �' Advanced GeoEnvironmental,Inc.