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' 21 March 2005 <br /> . AGE-NC Protect No 00-0764 <br /> ' Page 2 of 4 <br /> volatile organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid solution as a sample <br /> ' preservative, and into one 1-liter amber bottle without preservative <br /> ' The samples were properly labeled, placed in a chilled container, and transported under chain of <br /> custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services (DHS)-certified analytical laboratory located in Paramount, California Each sample was <br /> analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> respectively) In accordance with EPA method 8015M, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX), the fuel additives di-isopropyl <br /> ' ether(DIPS),ethyl tertiary-butyl ether(ETBE),methyl-tertiary butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), methanol, and ethanol, lead <br /> scavengers 1,2-dichloroethane(1,2-DCA)and 1,2-dibromoethane(EDB),and tnchloroethene <br /> (TCE),tetrachloroethene (PCE), and naphthalene in accordance with EPA Method 8260B <br /> lie 3.0. FINDINGS <br /> Ground water elevation,flow direction,and gradient were determined from field data collected from <br /> rshallow-screened wells MWA through MW-4 on 30 November 2004, the contaminant impact to <br /> ground water was quantified from the ground water laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Depths to ground water ranged from 32 59 feet to 33 69 feet below the tops of the well casings <br /> Ground water was within the screened intervals of wells MW-1 through MW-4, indicating that the <br /> wells should yield samples fully representative of shallow ground water conditions,well MW-5 was <br /> screened at approximately 32 feet below the water table and should yield water samples <br /> representative of deeper ground water conditions <br /> ' The elevation of ground water in each well was calculated by subtracting the ground water depth <br /> from the surveyed casing elevation Ground water elevations in the shallow wells ranged from <br /> 21 39 feet(MW-1 and MW-2)to 21 56 feet(MW-4)below mean sea level(MSL),the elevation of <br /> deeper screened well MW-5 was 2174 feet below MSL The relative ground water elevation data <br /> is summarized in Table 1 <br /> Ground water flow direction of first encountered ground water,in the area of the former USTs,was <br /> ' Admnced GeoEnvironmental,Inc <br />