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---------------- i 16 September 2003 AGE-NC Project No. 97-0360 f, Page 2 of 3 preservative. After collection, the samples were properly labeled,placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services-certified laboratory. The samples were analyzed for: --- Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Method 8015-modified; • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 8021; and Fuel additives includin MTBE, di-isopropyl ether(DIPE)�ethYlteWa ry-butYl ether(ETBE ), tertiary-amyl methyl ether(TAME),tertiary butanol(TBA), ethylene dibromide(EDB)and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B. 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 30 May 2003.The hydrocarbons-impact to groundwater was quantified from the laboratory analysis of the ground water samples. 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the May 2003 sampling event, depths to ground water in wells MW 1 through MW5 and EWl ranged from 7.35 feet.to 8.79 feet below the well heads.Average ground water elevation at the site(excluding MW2)was approximately 3.74 feet above mean sea level (MSL), showing a decrease of approximately 0.48 feet since the last monitoring event in March 2003 (Table 1). The ground water flow direction was inferred using ground water elevation data from the monitoring wells on-site. Well MW2 was not used in ground water flow direction or gradient determination because it is screened at a deeper interval than the other wells. The flow direction was inferred to be toward the north at a very flat gradient of 0.0006 fect/feet. Figure 3 illustrates the contoured ground water elevations. 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES No analytes were detected at or above laboratory reporting limits in any of the groundwater samples analyzed.The analytical results of groundwater samples are summarized on Table 2.The laboratory Advanced GeoEnvironmentaI,Inc.