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1 <br /> ' 24 April 2006 <br /> AGE-NC Project No 95-0137 <br /> 1 Page 2 of 4 <br /> vials and into two 1-liter amber bottles Samples were properly labeled,stored in a chilled container, <br /> ' and transported under chain of custody to Cal Tech Environmental Laboratories(CTEL),a California <br /> Department of Health Services (DHS)-certified laboratory,for analysis Each sample was analyzed <br /> ' for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d, <br /> 1 respectively) in accordance with EPA Method 8015 Modified, and <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) and fuel oxygenates methyl <br /> tertiary-butyl ether(MTBE),tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl <br /> 1 tertiary-butyl ether(ETBE),tertiary-amyl methyl ether(TAME), 1,2-dibromoethane(EDB), <br /> and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B f <br /> � C <br /> 3.0. FINDINGS ` 1 <br /> 1 t� <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on Int, <br /> 10 February 2006, the contaminant impact to ground water was quantified from laboratory data <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> 1 <br /> Depths to ground water during the February 2006 monitoring event ranged from 2144 feet(MW-3) <br /> 1 to 24 26 feet (MW-9) below the tops of the well casings, the average depth to ground water <br /> decreased approximately 1 18 feet since the November 2005 quarterly monitoring event The <br /> calculated ground water elevations ranged from 35 38 feet(MW-8) to 38 43 feet (MW-5) <br /> The ground water flow direction was northwest across the former UST area at the site,at a hydraulic <br /> gradient of approximately 0 001 foot/foot(ft/ft) (Figure 3) Upgradient of the former UST area, the <br /> 1 ground water flow direction was northwest with a gradient of approximately 0 039 ft/ft,away from <br /> well MW-5 " <br /> 1 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-d was detected in the off-site Junco well MW-6 at a concentration of 21,000 micrograms per <br /> liter (Vg/1) TPH-g was detected in wells MW-6 and MW-8 at concentrations of 24,000 µg/1 and <br /> 260 µg11,respectively,however,the detection of TPH-g in MW-6 was noted by the laboratory to be <br /> mostly in diesel range organic <br /> • <br /> ' Advanced GeoEnvironmental,Inc <br /> 1 <br />