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' 30 August 2005 <br /> • AGE-NC-95-0185 <br /> ' Page 2 of 4 <br /> 2.2.1. Well`Monitoring and Evacuation <br /> 1 <br /> The water level and any free-phase petroleum product in wells MW-1 through MW-4 weremeasured <br /> relative to the,tops of the well casings using a Solinst free product interface probe;the ground water <br /> r elevations and gradient were determined from this data-(Table 1). <br /> After gauging the depth to ground water; each monitoring well was purged with.a dedicated, <br /> disposable bailer. Between.3 and 7.5 gallons of ground water were removed from wells.MW=1 <br /> through MW-4. Temperature, pH and conductivity were measured at regular.intervals.during <br /> ' purging using an Oakton water analyzer(Appendix B).Purged water was stored on-site in 55-gallon <br /> Department.of Transportation (DOT)=approved drums. <br /> 2.2.2: Collection and Analysis of Ground Water Samples <br /> ' Ground, water samples were collected from the purged-wells using the dedicated, disposable <br /> polyethylene.bailers. Each water sample was transferred into three 40-m1 volatile organic analysis <br /> (VOA)vials containing 0.5 ml 18%hydrochloric acid as a sample preservative and one 1-liter amber <br /> '. bottle without preservative. The samples were then labeled and placed in a chilled container for <br /> transport under chain of custody to Cal Tech Environmental Laboratories(CTEL)of Paramount, a <br /> California Department of Health Services(DHS)-certified analytical laboratory.All water samples <br /> ' were analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified and <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel•additives methyl <br /> I ' tertiary butyl ether(MTBE),tertiary butanol(TBA),di-isopropyl ether(D1PE),ethyl tertiary <br /> butyl ether(ETBE)and tertiary amyl methyl ether.(TAME)in accordance with EPA Method <br /> 8260-Modified. <br /> L3.0: FINDINGS <br /> The ground water elevation, gradient and flow direction were determined from the field.data. <br /> ' Contaminant impact to ground water was assessed by field observations and laboratory analysis. <br /> Advanced GeoEnvironmentel,Inc. <br />