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' 27 August 2001 <br /> AGE-NC Project No 95-0104 <br /> IPage 2 of 4 <br />' 2 2 COLLECTION AND ANALYSIS 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 1 S%hydrochloric acid <br /> as a sample preservative and Into one 1-liter amber bottles without added preservative The samples <br /> were properly labeled, placed in a chilled container and transported under chain-o£-custody to <br /> IMcCampbell Analytical, Inc (NM a State of California Department of Health Services <br /> (DHS)-certified analytical laboratory The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) In <br /> accordance with EPA Methods 5030/3550/8015-Modified, <br />' * Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) In accordance with EPA Method 8020, and <br /> I • Fuel additives - MTBE, di-Isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dibromide (EDB) In accordance with EPA Method 8260M <br /> I� <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were deterrxained from field data collected on <br /> I 27 June 2001,the contaminant Impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> I The elevation of ground water In each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br /> I The depth to ground water ranged from 62 52 feet to 63 59 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 36 19 feet above mean sea level (MSL) in well <br /> MW-5 to 36 41 feet above MSL in well VW-1 Ground water elevations at the site decreased an <br /> average of 2 87 feet between the December 2000 and June 2001 sampling events Ground water <br /> levels were within the screened intervals of wells MW-1 and VW--1, and approximately 0 23 feet to <br /> 17 48 feet above the screened Intervals in the remaimng wells <br /> The ground water flow direction is inferred to be towards the northeast under an average hydraulic <br /> �. gradient of 0 003 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> Advanced GeoEnviroamental,Inc <br /> I <br />