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r <br />' 09 October 2003 <br /> • AGE-NC Project 99-0570 <br />' Page 2 of 4 <br />' 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' A water sample was collected from each well using the dedicated,disposable plastic bailer A sample <br /> was also collected from the domestic well during pump operation Immediately upon retrieval, <br /> samples were transferred into three 40-m1 Environmental Protection Agency (EPA)-approved <br />' volatile organic analysis (VOA)vials containing 0 5 ml hydrochloric acid as a sample preservative <br /> and into a one-liter amber bottle with no sample preservative The samples were logged on a chain- <br /> of-custody form, stored in a chilled container and transported under chain-of-custody to Cal Tech <br />' Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br /> laboratory, for analysis <br />' Ground water samples were analyzed for the following analytes <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br />' accordance with EPA Method 8015 Modified, <br /> • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary butyl ether <br />' . (MTBE) in accordance with EPA Method 8021 and <br /> • The oxygenated compounds di-isopropyl ether (RIPE), ethyl tertiary-butyl ether(ETBE), <br /> methyl tertiary butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br />' (TBA), ethyl dibromide(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br />' Ground water elevation, flow direction and gradient were determined from field data collected <br /> on May 2003 while the hydrocarbon-impact to ground water was assessed by laboratory analysis of <br />' the ground water samples <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> The depth to ground water ranged between 14 04 feet below well casing grade in well MW-2 to <br />' 15 42 feet below well casing grade in well MW-5 (Table 1) The relative ground water elevation <br /> ranged from 8 77 to I 1 10 feet below sea level The top of the ground water table occurred within <br /> the screened intervals of the wells' Ground water was inferred to be flowing to the north at a <br /> Isignificant hydraulic gradient of 0 02 feet/feet toward well MW-5 The ground water elevation <br /> contours are depicted on Figure 3 <br /> Advanced GeoEnviranmental,Inc <br />