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I •i s — <br />' 14 October 2004 <br /> AGE-NC Project No 01-0839 <br />' Page 2 of 4 <br />' After collection, the samples were properly labeled, placed in a chilled container, and transported <br /> under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department <br /> of Health Services-certified analytical laboratory, for analysis The samples were analyzed for <br />' 0 Total petroleum hydrocarbons as gasoline(TPH-g)In accordance with EPA Method 8015M, <br /> and <br />' 0 Benzene,toluene, ethylbenzene, and total xylenes(BTEX),di-isopropyl ether(DIPE), ethyl <br /> tertiary-butyl ether(ETBE), methyl tertiary-butyl ether(MTBE), tertiary-amyl methyl ether <br />' (TAME), tertiary-butyl alcohol (TBA), ethylene dibromide (EDB), and 1,2 dichloroethane <br /> (1,2-DCA) by EPA Method 8260B <br />' 3.0. FINDINGS <br />' The ground water elevation, flow direction, and gradient were determined from field data The <br /> contaminant impact to ground water was quantified by the laboratory analytical data <br />' <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> rAt the time of the May 2004 sampling event, depths to ground water ranged from 68 85 feet to <br /> 69 13 feet below the tops of the well casings (Table 1) Ground water elevations at the site ranged <br />' from 35 04 feet(MW-4)to 35 51 feet(MW-3)below mean sea level(MSL) During this monitoring <br /> event,the ground water level was within the screened interval of the wells, indicating that the wells <br /> were properly screened to yield representative shallow ground water samples <br /> The ground water flow direction was calculated from the well elevation data The net ground water <br /> flow direction was inferred to be toward the south to southwest at the former UST excavation at a <br />' gradient of approximately 0 01 ft/ft North of the former UST excavation, ground water flowed due <br /> west at a gradient of approximately 0 003 ft/ft (Figure 3) <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MW-3 and MW-4 at concentrations <br /> of 9,000 micrograms per liter(µg11) and 200 gg/l, respectively <br /> MTBE was detected In the water samples collected from wells MW-3 and MW-4 at concentrations <br /> of 8,900 µg/1 and 200 µg11, respectively <br /> IAdvanced Geo Environmental,Inc <br /> I <br />