Laserfiche WebLink
y . <br />' 21 October 2004 <br /> AGE-NC Project No 02-0964 <br />' Page 2 of 4 <br />' 0 5 ml 18%hydrochloric acid solution as a sample preservative and one 1-liter amber bottle without <br /> preservative The samples were labeled with the monitoring well designation,date,time of sampling, <br /> and the sampler's initials and transported in a chilled container under chain of custody to Cal Tech <br />' Environmental Laboratories (CTEL), a Department of Health Services (DHS)-certified analytical <br /> laboratory for analysis The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline(TPH-g),diesel(TPH-d),and motor oil <br /> (TPH-mo) in accordance with EPA method 8015M, <br />' • Volatile aromatic compounds benzene, toluene, ethylbenzene, and total xylenes (BTEX) in <br /> accordance with EPA method 8260B, <br /> • Fuel oxygenates tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tertiary-butyl ether <br />' (ETBE), tertiary-amyl methyl ether (TAME), and MTBE in accordance with EPA method <br /> 8260B, and <br />' • Fuel scavengers ethylene dibromide(EDB)and 1,2-dichloroethane(1,2-DCA)in accordance <br /> with EPA method 8260B <br /> 30 FINDINGS <br />' Ground water elevation and flow direction were inferred from field data, hydrocarbon impact to <br /> ground water was quantified by laboratory analysis of the ground water sample <br /> I <br /> 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each of the monitoring wells was calculated by subtracting the <br /> depth to ground water from the surveyed relative casing elevations(Table 1) Depths to ground water <br /> averaged about 29 94 feet below surface grade(bsg) Ground water elevations at the site ranged from <br /> 17 87 feet(MW-3) to 19 10 feet (MW-1)below mean sea level (MSL) The ground water gradient <br /> was calculated to be approximately 0 010 foot/foot (ft/ft) toward the east-northeast During this <br />' monitoring event, the ground water elevations were within the screened intervals of the wells <br /> Figure 3 illustrates the contoured ground water elevations as measured on 23 July 2004 <br /> I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During this monitoring event,a sample was only taken from well MW-I TPH-g was detected in the <br /> water sample from well MW-1 at a concentration of 27,000 micrograms per liter(µg/1),benzene was <br /> Advanced GeoEnvironmental,Inc <br />