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I121u1y 2006 ' <br /> . AGE-NC Project No 95-0130 <br />' Page 3 of 14 <br /> 2 2 GROUND WATER SAMPLING <br /> Ground water samples were collected from wells MW-1,MW-2,MW-3,and MW-5 through MW-8 <br />' utilizing a dedicated polyethylene tubing and poured directly into the 40-m1 EPA-approved volatile <br /> organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative <br /> Care was taken to ensure that visible air bubbles were not present in the vials after filling and <br />' capping Ground water sample containers were labeled with the well designation, date, time, and <br /> sampler's initials <br />' Ground water samples were collected for VW-IC, VW-2A and VW-3A at independent sampling <br /> ports located near the pump-and-treat holding tank, each SVE well was allowed to be operational <br /> for at least 30 minutes prior to collecting samples directly into the sample containers <br /> 23 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br />' Each ground water sample was logged on a chain of custody form, placed in a chilled container and <br /> transported to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br />' . Services (DHS)-certified laboratory for analysis for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g)by EPA Method 8015M and <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX), 1,2-Dichloroethane (1,2-DCA), <br /> ethylene dibromide (EDB), methyl-tertiary butyl ether(MTBE),tertiary butanol (TBA), di- <br /> isopropyl ether(DIPE),ethyl tert butyl ether(ETBE)and tert amyl methyl ether(TAME)by <br /> EPA Method 8260E <br /> 1 <br /> 24 QUARTERLY GROUND WATER MONITORING FINDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 28 February 2006 The contaminant impact to ground water was quantified by laboratory analysis <br />' of water samples <br />' 2 4 1 GROUND WATER ELEVATION AND GRADIENT <br /> The measured depths to ground water from the purged wells were between 41 58 and 44 74 feet <br /> below the top of the well casings Ground water elevations were calculated to be between 25 83 feet <br /> • (MW-1)and 28 37 feet(MW-7B)below mean sea level (MSL) Generally, ground water elevation <br /> Advanced GeoEnvsronmentat,Inc <br />