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' 1 <br /> 15 December 2005 <br /> . AGE-NC Project No 98-0465 <br />' Page 2 of 8 <br /> r <br /> in properly labeled,75H 55-gallon Department of Transportation(DOT)-approved drums and stored <br />' on-site <br />' 2 1 1 Collection and Analysis of Ground Water Samples <br />' Water samples were collected from each monitoring well using dedicated,disposable plastic bailers <br /> after allowing the well to achieve a minimum 80% recovery of the pre-purge water volume The <br /> samples from each well were transferred into three 40-milliliter(ml)volatile organic analysis(VOA) <br />' vials containing 0 5 ml 18%hydrochloric acid solution as a sample preservative The samples were <br /> labeled with the monitoring well designation,date,time of samphrig,and the sampler's initials,and <br /> transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories <br /> (CTEL),a Department of Health Services-certified analytical laboratory, for analysis The samples <br /> were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline(TPH-g)and quantified as diesel (TPH- <br /> d) in accordance with EPA Method 8015-m6dified, <br />' 0 Volatile aromatic compounds benzene, toluene, ethylbenzene, and xylenes (BTEX) in <br /> accordance with EPA Method 826013, <br /> • Fuel oxygenates MTBE, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br /> tertiary-amyl methyl ether (TAME), and tertiary butanol (TBA) in accordance with EPA <br /> Method 8260B, and <br />' Fuel scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance_ <br /> with EPA Method 8260B <br /> 3.4. FINDINGS <br /> iHydrocarbon impact to groundwater were assessed by laboratory analysis Ground water elevation <br /> _ and flow direction were inferred from field data collected on 20 October 2005 <br /> J <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 1 The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> depth,to ground water from the surveyed casing elevations (Table 2) Depths to ground water <br /> averaged 12 81 feet below surface grade (bsg) Ground water elevations at the site ranged from <br /> 9 54 feet(MW-4)to 9 75 feet(MW-2)below mean sea level (MSL) Ground water elevations at the <br />' Advanced GeoEnvironmental,Inc <br /> I , <br />