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1 <br /> 02 February 2005 <br /> AGE-NC Project No 02-0964 <br />' Page 2 of 4 <br />' MW-1 were transferred Into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples were labeled with the <br /> monitoring well designation, date,time of sampling, and the sampler's initials and transported in a <br />' chilled container under chain of custody to Cal Tech Environmental Laboratories (CTEL), a <br /> Department of Health Services(DHS)-certified analytical laboratory for analysis The samples were <br /> analyzed for <br />' 0 Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M, <br />' & Volatile aromatic compounds benzene,toluene,ethylbenzene,and total xylenes(BTEX)with <br /> fuel oxygenates tertiary butanol (TBA),di-isopropyl ether(DIPE), ethyl tertiary-butyl ether <br />' (ETBE), tertiary-amyl methyl ether(TAME), methyl tertiary butyl ether(MTBE), and fuel <br /> lead scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data, hydrocarbon-impact to <br /> ground water was quantified by laboratory analysis of the ground water sample <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> depth to ground water from the surveyed relative casing elevations(Table 1) Depths to ground water <br /> averaged about 29 45 feet below surface grade(bsg) Ground water elevations at the site ranged from <br /> 17 36 feet(MW-3)to 19 00 feet(MW-1)below mean sea level (MSL) The ground water gradient <br />' was calculated to be approximately 0 010 foot/foot (ft/ft) toward the east-northeast During this <br /> monitoring event, the ground water elevations were within the screened intervals of the wells <br /> Figure 3 illustrates the contoured ground water elevations as measured on 30 December 2004 <br /> 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During this monitoring event,a sample was only taken from well MW-1 TPH-g was detected in the <br /> water sample from well MW-1 at a concentration of 33,000 micrograms per liter(�tg/l),benzene was <br /> detected at a concentration of 140 µg/l, toluene was detected at a concentration of 20 gg/l, and <br /> ethylbenzene and total xylenes were detected at concentrations of 1,700 µg/1 and 3,760 µg11, <br /> Advanced GeoEnvironmental,Inc <br /> I <br />