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' 27 December 2004 <br /> SAGE-NC Project No. 95-0185 <br /> Page 2 of 4 <br /> 2.2.1. Well Monitoring and Evacuation <br /> The water level and any free-phase petroleum product in wells MW-1 through MW-3 were measured <br /> relative to the tops of the well casings using a Solinst free product interface probe;the ground water <br /> ' 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 0.75 and 2 gallons of ground water were removed from wells MW-1 . <br /> through MW-3.Temperature,pH and conductivity were measured at regular intervals during purging <br /> ' 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 fon. <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 /> ' tertiary butyl ether(MTBE),tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tertiary <br /> butyl ether(ETBE)and tertiary amyl methyl ether(TAME)in accordance with EPA Method <br /> 8260 Modified. <br /> ' 3.0. 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 /> 1 <br /> ' Advanced GeoEnvironmental,Inc. <br />