ARCHIVED REPORTS_XR0004999 - Laserfiche WebLink

Home Browse Search

08 July 2002 AGE-NC Project No 98-0521 Page 2 of 4 collected from each well using a new disposable plastic bailer and were transferred into three 40-m1 ' volatile organic analysis (VOA) vials containing 0 5 ml hydrochloric acid (18%) as a sample preservative The samples were then labeled and placed in a chilled container for transportation under chain-of-custody to Cal Tech Environmental Laboratories(CTEL), a California Department of Health Services-certified laboratory Ground water samples were analyzed for the following ' Total petroleum hydrocarbons quantified as gasoline (TPH-g ) in accordance with EPA Method 8015 Modified, ' • Benzene, toluene, ethyl benzene and total xylene (BTEX) and methyl tertiary-butyl ether (MTBE) in accordance with EPA method 8 02 1, • The oxygenated compounds di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), MTBE,tertiary-amyl methyl ether(TAME),tertiary butanol(TBA),methanol,ethanol, 1,2- dibromoethane(EDB) and 1,2-dichloroethane(1,2-DCA) in accordance with EPA Method 8260B 1 ! 3.0. FINDINGS 1 The ground water flow directlonland gradient were inferred from the field data Dissolved petroleum ' hydrocarbon impact to ground water was quantified by laboratory analysis of the samples collected i 1 ' 3 1 GROUND WATER ELEVATION, FLOW DIRECTION AND GRADIENT On 31 May 2002, the depth to ground water at the site ranged from 7 72 to 8 01 feet below the tops ' of'the well casings The ground water elevations at the site ranged from 7 34 feet (MW-3) to 7 68 feet(MW-2)below mean sea level(MSL) The ground water flow was directed toward the east- northeast with a hydraulic gradient calculated to be 0 013 foot/foot'Depth to water and ground water elevation are suinrrlanzed In Table 1 FigurO illustrates the cont6ured ground water elevations , A m E , 1 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES 11 , The results of the May 2002 monitoring event are as follows �1 1 1 Advanced GeoEnvironmenl21,Ine 1 t