ARCHIVED REPORTS_XR0007758 - Laserfiche WebLink

Home Browse Search

' 28 March 2005 AGE-NC Project No 99-0637 ' Page 2 of 4 of Health Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed ' for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in raccordance with EPA Method 8015 Modified, • Benzene, toluene,ethylbenzene and total xylenes(BTEX) In accordance with EPA Method ' 8021, and • Fuel additives including methyl tertiary-butyl ether(MTBE),di-isopropyl ether (DIPE), ethyl ' tertiary-butyl ether (ETRE), tertiary-amyl methyl ether (TAME), tertiary butanol (TBA), ethylene dibromlde (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B 1 ' 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 29 November 2004 The MTBE-impact to ground water was quantified from the laboratory analysis of the ground water samples 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION At the time of the November 2004 sampling event, depths to ground water ranged from 18 81 feet to 21 11 feet below the tops of the well casings Ground water elevations at the site ranged from 12 97 feet above mean sea level (MSL) to well MW-9 to 13 64 feet above MSL in well MW-3 ' (Table 1) Ground water elevations at the site averaged approximately 13 46 feet above mean sea level (MSL) showing an elevation increase of approximately 3 57 feet since the last monitoring ' event Ground water flow was inferred to be flowing toward the northwest,away from the former UST area at an average gradient of 0 003 Rift, and toward the north-northeast at an average gradient of 0 002 ft/ft Figure 3 illustrates the contoured ground water elevations as measured on 29 November 2004 ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g,TPH-d,BTEX and the fuel additives,with the exception of MTBE,were not detected in any of the ground water samples collected • ' Advanced GeoEnvironmental,Inc