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07y y 2004 <br /> .. AGE-NC.Project No. 9570106 <br /> ' Page 2'of 4 t <br /> Laboratories. .(CTEL), a California Department of Health Services . DHS)-certified analytical <br /> Ilaboratory,-and analyzed for: <br /> • Total etroleum, h drocarbons uantified as = asoline. TPH- m 'accordance with <br /> p Y q, g ( g)< <br /> EPA,Method'80I5-Modified, and' ; <br /> •' Benzene,toluene;ethylbenzene and xylenes(BTEX); and the fuel additives methyl-tertiary- <br /> butyl-ether (MTBE),tertiary butyl alcohol (TBA), di-isopropyl-ether(DIPE), ethyl tertiary'' <br /> L butyl ether(ETBE), and tertiary amyl methyl ether(TAME), 1,2-dibromoethane(EDB) and <br /> .1,2-dicliloroethane (1,2-DCA) in accordance with EPA Method 8260B. <br /> 3:0. FINDINGS <br /> ,Ground water`elevation and flow direction were inferred from field data.'The hydrocarbon impact <br /> to groundwater was qualitl i d by laboratory analysis of the ground water samples. <br />' 3.1. , GROUND'WATER .ELEVATION AND FLOW DIRECT-ION ; <br /> The relative ground water elevation ranged frdm 31.84 feet (MW--6 upper) to 32.77 feet'(MW-2),, <br /> increasing an average of'0.11 feet since the June 2003 monitoring event. The water table appears as <br /> a northerly plunging ridge; the east limb of.the ridge flows toward the northeast at a gradient of <br /> approximately.0.005 feet/feet and .the west limb flows toward the northwest at a'gradient of <br /> approximately 0.005 feet/feet:-Ground .water elevation data. is presented;in Table l while,the . <br /> contoured'ground water:elevation-data is shown on Figure 3. ± <br /> 3:.2. ANALYTICAL RESULTS OF GROUNDWATER SAMPLES <br /> TPH-g was detected.in coilcelltrations of 150 micrograms per liter(gg/L)and 2,000,gg/L in sample`s <br /> from wells MW-1 and MW-4, respectively"(Figure 4). <br /> BTEX compounds were, detected .in wells MW-1 and MW-4 at the following concentrations:; <br /> benzene'53 gg/L and 74 µg/L, toluene 6.9 ug/L and•5':8 gg/L, ethylbenzene3.7,gg/L and 74 gg/L <br /> and xylenes 7.4 ug/.L'and 44 µg/L, respectively: <br /> .'-MTBE was detected in the ground water sample collected.from well MW-1 at a concentration'of <br />' 9:3 g­IL. <br /> Advanced GeoEnvironmental,Inc.' <br />