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i 08 October 2003 AGE-NC Project No 97-0343 IPage 2 of 4 I custodyto Cal Tech Environmental Laboratories(CTEL),a Department of Health Services-certified laboratory The ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA Method 8015-modified for gasoline and diesel, • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and the fuel additives methyl- tertiary butyl ether (MTBE), di-isopropyl ether (DEPE), ethyl-tertiary butyl ether (ETBE), tertiary-amyl methyl ether(TAME),tertiary butanol (TBA), 1,2-dibromoethane (EDB) and 1,2-dlchloroethane (1,2-DCA) In accordance with EPA Method 8260B I3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected I onl9 May 2003 The contaminant impact to ground water was quantified from the laboratory analytical data lie 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the May 2003 sampling event, depths to ground water in wells MW4 through MW7 ranged from 56 38 feet to 57 55 feet below the well heads, ground water elevations ranged from 31 49 feet below mean sea level (MSL) in well MW4 to 31 57 feet below MSL in well MW6 I (Table 1) Ground water elevations at the site decreased an average of 0 05 feet since the first quarter 2003 monitoring event Based on the elevation contours, the ground water flow direction was inferred to be flowing generally to the north-northwest at an average hydraulic gradient of 0 008 feet/feet Figure 3 illustrates the contoured ground water elevations as measured on 19 May 2003 I 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g, TPH-d, BTEX and fuel additives were not detected at or above laboratory reporting limits in the ground water samples collected from wells MW4 throughMW7 The analytical results of water samples collected in May 2003 are summarized on Table 2 The I laboratory report (CTEL Lab Project No CT214-0305110), QA/QC report and chain-of-custody form are included in Appendix C Advanced GeoEnvironmental,Inc