Laserfiche WebLink
-- r <br /> 7 <br /> } <br /> 06 May 2004 <br /> AGE-NC Project No 95-0184 <br /> Page 2 of 5 <br /> r <br /> I2 2 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from MW-1 through MW-4, MW-7, VW-3 and VW-4 with a hose <br />' bailer while dedicated disposable plastic bailers were used to sample the remaining wells after <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into laboratory-supplied 40-m1 volatile organic analysis (VOA) vials <br />' containing 0 5 ml 18%hydrochloric acid as a sample preservative,the sample from MW-4 was also <br /> transferred into a 1-liter amber bottle without preservative After collection, the samples were <br /> properly labeled, placed in a chilled container and transported under chain-of-custody to Cal Tech <br /> Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified <br /> analytical laboratory for analysis The samples were analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015M and <br />' • Volatile organic compounds (VOCs), including benzene, toluene, ethylbenzene and total <br /> xylenes (BTEX) with fuel oxygenates, including di-isopropyl ether (DIPE), ethyl tertiary <br /> butyl ether(ETBE),methyl tert butyl ether(MTBE),tertiary-amyl methyl ether(TAME)and <br />' • tertiary butyl alcohol (TBA) in accordance with EPA method 8260B Full Scan <br />' In addition, ground water sample MW-4 was analyzed for diesel (TPH-d) in accordance with EPA <br /> Method 8015M <br />' 3.0. 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 samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed casing elevations (Table 1) Depths to ground water ranged from 36 50 feet to Vv� <br /> l�ro 37 12 feet below the tops of the well casings The average ground water ele�yfpon at the site was J0 <br /> I21-55 met below mean sea level (MSL), indicating an average decrease of 1feet below MSL <br /> between the third quarter 2003 and fourth quarter 2003 monitoring events The ground water levels <br /> were as high as approximately 18 feet above the screened intervals in wells MW-1 through MW-4 <br /> r,`ti'� and MW-7 <br /> Advanced GeoEnvironmental,Inc <br /> I <br />