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r E I r I 12 January 2004 ` AGE-NC Project No 95-0121 1 Page 3 of 6 r SL 1 n I I the purged wells utilizing the dedicated,disposable bailers and transferred into 1-liter amber bottles ' without sample preservative and 40-m1 EPA-approved volatile organic analysis (VOA) vials it containing 0 5 ml 18% hydrochloric acid as a sample preservative Care was taken to ensure that _ 'W ' visible air bubbles were not present in the vials after filling and capping Ground water sample _ , n containers were labeled with the well designation, date, time, and sampler's initials 2'4 LABORATORY ANALYSIS OF GROUND WATER SAMPLES L ' Following collection and labeling,each ground water sample was logged on a chain-of-custody form, placed in a chilled container and transported to Cal Tech Environmental Laboratories , a California Department of Health Services (DHS)-certified laboratory, for analysis for , ' • Total petroleum hydrocarbonsquantified as gasoline and diesel (TPH-g and TPH-d respectively) by EPA Methods 8015M, • Benzene, toluene, ethyl benzene and xylene (BTEX), methyl tent butyl ether (MTBE), di- isopropyl ether (DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME), ' tertiary butanol (TBA), ethylene dibromide (EDB) and 1,2-dzchloroethane (1,2-DCA) by EPA Method 8260B } 1 3.0. ' FINDINGS I „ Ground water elevation,flow direction and gradient were determined from field data collected on 25 September 2003 The contaminant impact to ground water was quantified by the ground water , ' laboratory data collected on 25 and 26 September 2003 1 ' 3 1 GROUND WATER ELEVATION AND GRADIENT The depths to ground water in wells MW-1 through MW-9 and VW-I through VW-8 were measured ' at between 17 80 and 19 67 feet below the tops of well casings The ground water elevations were calculated to be between 11 40 feet (VW-7) and 12 73 feet (MW-8) below mean sea level The ground water elevation data obtained during this monitoring event from the ground water monitoring 'F wells are depicted in Figure 3 The inferred ground water flow direction, from within the lower sand level (confined)of the aquifer, for the area bound by wells MW-1 through MW-9 was inferred to be i towards the northeast at an approximate gradient of 0 001 ft/ft or less, or approximately 5 feet per mile (Figure 3) , I� Advanced GcoEnvironmental,Inc I I r i i J