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10 May 1999 <br /> . AGE-NC Project No 95-0111 <br /> Page 3 of 6 <br /> 2 4 MONITORING WELL PURGE PROCEDURES <br /> The water level in each monitoring well was measured relative to the tops of the well casings using <br /> a Solinst water level meter After water levels were measured, a two-stage submersible pump was <br /> used to purge each well Three to four gallons (minimum of three well volumes) of water were <br /> removed from wells MW-1 through MW-6 and ten gallons of water were removed from wells MW-7 <br /> I and MW-8 Temperature,pH and conductivity were measured at one-gallon intervals using an ICM <br /> water analyzer during purging, and the values had generally stabilized by the end of the purging <br /> process (Appendix B) Purged water was stored on-site in 55-gallon, Department of Transportation <br /> (DOT)-approved drums <br /> 25 COLLECTION OF GROUND WATER SAMPLES <br /> Prior to collection of ground water samples,the depth to ground water was measured in each purged <br /> well to ensure that a minimum of 80% of the well volume had recharged Water samples were <br /> collected from each well using a new disposable plastic bailer Each water sample was transferred <br /> • into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% HCL as a <br /> sample preservative and into one 1-liter amber bottle After collection,the samples were labeled and <br /> placed in a chilled container for transportation under chain-of-custody to McCampbell Analytical, <br /> I Inc (MAI),a California Department of Health Services(DHS)-certified analytical laboratory located <br /> in Pacheco, California Each sample was analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by <br /> EPA Method 8015 Modified for each range of hydrocarbons, <br /> I • Volatile aromatic compounds (benzene,toluene, ethylbenzene and total xylenes BTEX) by <br /> EPA Method 8020, and <br /> • Oxygenated compounds,di-isopropyl ether(DIPS),ethyl tertiary butyl ether(ETBE),methyl <br /> rtertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol(TBA) <br /> by EPA Method 8260 Modified <br /> 3.0. FINDINGS <br /> Soil in the area east of well MW-5 and west of well MW-1 was found to containP etroleum <br /> hydrocarbons at depths of five feet and ten feet, bsg Ground water was inferred to have a northerly <br /> flow direction and was found to be locally impacted by petroleum hydrocarbons and oxygenated fuel <br /> . additives <br /> Advanced GeoEnvironmental Inc <br /> I <br />