Laserfiche WebLink
12 July 2002 <br /> AGE-NC Project No 98-0492 <br /> ' Page 2 of 3 1 <br /> sample preservative and into one 1-liter amber bottle without sample preservative After collection, <br /> ' the samples were properly labeled, placed in a chilled container and transported under chain-of- <br /> custody to McCampbell Analytical,Inc (MAI),a California Department of Health Services(DHS)- <br /> certified analytical laboratory The samples were analyzed for <br /> ' • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015 Modified <br /> ' • Benzene, toluene, ethylbenzene and total xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE) in accordance with EPA Method 8020 <br /> • Fuel additives, including, di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), <br /> MTBE,tertiary-amyl methyl ether(TAME),tertiary-butyl alcohol(TBA), 1,2-dicbloroethane <br /> ' (1,2-DCA)and ethylene dibromide(EDB) in accordance with EPA Method 8260 Modified <br /> 3.4 FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br /> ,• 08 May 2002, the contaminant impact to ground water was assessed from the laboratory analytical <br /> data obtained from the sampling event <br /> ' 3 1 GROUND WATER ELEVATION, GRADIENT AND FLOW DIRECTION <br /> ' At the time of the May 2002 sampling event,depths to ground water in wells MW 1,MW2 and MW3 <br /> ranged from 20 25 feet to 21 50 feet below the well heads Ground water elevations at the site ranged <br /> ' from 15 82 feet above mean sea level (MSL) in well MW2 to 15 87 feet above MSL in well MW 1 <br /> (Table 1) Ground water elevations at the site decreased an average 2 02 feet between the February <br /> 2002 and May 2002 sampling events <br /> The ground water flow direction was determined using ground water elevation data from the three <br /> monitoring wells on-site The flow direction was found to be toward the northwest with a hydraulic <br /> gradient of 0 0006 feet/feet Figure 3 illustrates the contoured ground water elevations as measured <br /> on 08 May 2002 <br /> ' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> No analytes were detected at or above laboratory reporting limits in the ground water samples <br /> i <br /> ' Advanced GeoFnvironmental,tnc <br />