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22 July 2403 <br /> AGE-NC Project No 00-0764 <br /> ' Page 2of4 <br /> Immediately upon retrieval, samples were transferred into chilled 40-m1 EPA-approved volatile <br /> ' organic analysis (VOA)vials containing 0 5 ml hydrochlonc acid (18%) as a sample preservative <br /> The samples were properly labeled, placed in a chilled container and transported under chain-of- <br /> custody <br /> hain-ofcustody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health <br /> Services-certified analytical laboratory located in Paramount,California Each sample was analyzed <br /> ' <br /> in accordance with <br /> • EPA Method 8015 Modified for total petroleum hydrocarbons quantified as gasoline <br /> (TPH-g) and <br /> • EPA Method 8260B for volatile organic compounds (VOCs), Including benzene, toluene, <br /> ethylbenzene and total xylenes (BTEX), the fuel additives di-Isopropyl ether(DIPE), ethyl <br /> tertiary butyl ether(ETBE), methyl tertiary butyl ether(MTBE), tertiary amyl methyl ether <br /> (TAME) and tertiary butyl alcohol (TBA), and the lead scavengers 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide(EDB) <br /> 1 <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected <br /> ' MW-1 through MW-3 on 25 April 2003, the contaminant impact to ground water was quantified <br /> from the ground water laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> ' Depths to ground water ranged between 30 25 and 31 11 feet below the top of the casings Ground <br /> water was within the screened intervals of wells MW-1 through MW-4,which should yield samples <br /> fully representative of shallow ground water conditions,well MW-5 was screened at approximately <br /> ' 35 feet below the water table and should yield water samples representative of deeper ground water <br /> 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 at the UST site ranged between 18 61 <br /> ' feet (MW-4) to 19 07 feet(MW-1)below mean sea level The relative ground water elevation data <br /> is summarized in Table 1 <br /> Ground water flow direction in the area of the former USTs was inferred to be towards the east to <br /> northeast at a gradient of approximately 0 005 (ft/ft), as depicted in Figure 3 <br /> 1 <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />