Laserfiche WebLink
' 04 November 2002 <br /> • AGE-NC Project No 95-0109 <br />' Page 2 of 4 <br />' each purged well using a new disposable plastic bailer Immediately upon retneval, the sample was <br /> transferred into 40-m1 EPA-approved VOA vials containing 0 5ml 18% hydrochloric acid as a <br /> sample preservative The samples were labeled,stored on ice, and transported in a chilled container, <br />' under chain-of-custody,to McCampbell Analytical,Inc (MAI),a State of California Department of <br /> Health Services-certified analytical laboratory The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Methods 5030/8015M, <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA method <br />' 8021B, <br /> • The fuel additives di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), methyl <br />' tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), <br /> 1,2-dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA <br /> Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation and flow direction were inferred from field data collected on <br />' 16 September 2002 The hydrocarbon-impact to ground water was quantified by laboratory analysis <br /> of the ground water samples <br />' 3 1 GROUND WATER GRADIENT AND DIRECTION <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well casing elevations (Table 1) <br />' The depth to ground water ranged from 54 57 feet to 58 47 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 1 14 feet below mean sea level(MSL)in well MW-5 <br /> to 5 11 feet below MSL in well MW-13 Ground water elevations at the site decreased an average <br /> of 197 feet between the June 2002 and September 2002 sampling events Ground water levels were <br /> within the screened intervals of all the wells sampled <br /> The ground water appears to flow radially outward between west-southwest at the western edge of <br /> the site and south at the central portion of the site The ground water gradient ranged between <br /> 0 02 ft/ft at the western edge to 0 009 ft/ft at the central portion of the site Figure 3 illustrates the <br /> Icontoured ground water elevations, historical ground water flow directions are summarized on <br /> . Table 4 <br /> I <br /> Advanced GeoE nviron mental,Inc <br /> I <br />