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' 01 October 2004 <br /> AGE-NC Project No 95-0130 <br />' Page 3 of 6 <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 a California Department of Health Services (DHS)-certified laboratory for analysis <br /> for <br />' • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Method 5030/8015M, <br /> • Benzene, toluene, ethylbenzene and xylene (BTEX), methyl-tertiary butyl ether (MTBE), <br /> 1,2-Dichloroethane (1,2-DCA), ethylene dibromide (EBD), tertiary butanol (TBA), di- <br /> isopropyl ether(DIPE), ethyl tert butyl ether (ETRE), tert amyl methyl ether (TAME) and <br /> MTBE by EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation flow direction and gradient were determined from field data collected on <br /> 09 February 2004 The contaminant impact to ground water was quantified by laboratory analysis <br /> lie of water samples <br />! 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depths to ground water from the purged wells were measured between 43 10 and 44 27 feet <br /> below the top of the well casings Ground water elevations were calculated to be between 27 11 <br /> (MW-7A) feet and 28 05 (MW-6A) feet below mean sea level (MSL) Generally, ground water <br /> elevation at the site increased an average 0 32 feet between the November 2003 and the <br /> February 2004 ground water monitoring events First zone (between 35 and 55 feet) ground water <br /> flow direction at the Top Filling Station was inferred to be towards the northeast at an approximate <br /> gradient of 0 005 ft/ft,and at the Knowles-Rock site ground water was inferred to be towards the east <br /> at an approximate gradient of 0 002 ft/f1 Second zone (between 55 and 85 feet bsg) ground water <br /> flow direction at the Top Filling Station was inferred to be towards the east at a gradient of 0 003 <br /> fl/ft or less, and at the Knowles-Roek site ground water in the second zone was inferred to be <br /> towards the east to northeast at an approximate gradient of 0 002 ft/ft The ground water elevation <br /> data collected during the February 2004 ground water monitoring event is depicted in Figures 3 <br /> I and 4 <br /> I <br /> Advanced GeoEnvironmental,Inc <br />