Laserfiche WebLink
' 23 December 2003 <br /> • AGE-NC Project No 95-0104 <br />' Page 2 of 3 <br /> recovery of the pre-purge water volume Each water sample was transferred into three 40-m1 volatile <br />' organic analysis(VOA)vials containing 0 5 ml 18%hydrochloric acid as a sample preservative and <br /> into one 1-liter amber bottle without added preservative The samples were properly labeled,placed <br /> in a chilled container and transported under chain-of custody to McCampbell Analytical,Inc (MAI) <br />' a State of California Department of Health Services (DHS)-certified analytical laboratory The <br /> samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> accordance with EPA Methods 5030/3550/8015-Modified, <br />' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) In accordance with EPA Method 8020, and <br />' • Fuel additives MTBE, dl-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> tertiary-amyl methyl ether(TAME), tertiary butanol (TBA), 1,2-dichloroethane (1,2-DCA) <br /> and ethylene dlbromide (EDB) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> 18 June 2003,the contaminant impact to ground water was quantified from the Iaboratory analytical <br /> data obtained from the sampling event <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water In each monitored well was calculated by subtracting the depth to <br /> ground water from the surveyed well casing elevations (Table 1) <br /> The depth to ground water ranged from 68 15 feet to 69 56 feet below the tops of the well casings <br /> Ground water elevations at the site ranged from 30 21 feet above mean sea level (MSL) in well <br /> MW-5 to 30 87 feet above MSL in well MW-6 <br /> The ground water flow direction on 18 June 2003 was inferred to be towards the northwest under <br /> an average gradient of 0 040 feet/feet Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> 1,2-DCA was detected in the water samples collected from MW-1, MW-5, MW-6 and VW-1 at <br /> concentrations of 1 3 gg/l, 17 µg/l, 12 µg/1 and 5 4 µg/l,respectively TPH-g,BTEX and other fuel <br /> Advanced GeoEnvironmental,Inc <br /> I <br />