ARCHIVED REPORTS XR0010975 - Laserfiche WebLink

Home Browse Search

h w 10 January 2006 AGE-NC Project No. 97-0360 Page 2 of 4 E 1-liter amber bottle without preservative.After collection,the samples were properly labeled,placed in a chilled container, and transported under chain of custody to Cal Tech Environmental Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical laboratory. The samples were analyzed for: Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in � accordance with EPA Method 8015M; and F • Benzene,toluene,ethylbenzene,and total xylenes(BTEX}and fuel additives methyl tertiary- ,:.:. butyl ether(MTBE), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary- jamyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane {EDB}, and 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260.B. l' 3.0. FINDINGS Ground water elevation, flow direction, and gradient were determined from field data collected on 24 June 2005. The hydrocarbon-impact to ground water was quantified from laboratory analysis of the ground water samples. { 3.1. GROUND WATER GRADIENT AND FLOW DIRECTION ;1 At the time of the June 2005 sampling event,depths to ground water in wells MW-1 through MW-5 and EW-1 ranged from 7.53 feet(MW-2)to 9.53 feet(MW-3)below the wellheads.Average ground water elevation at the site (excluding MW-2 and EW-1) was approximately 2.90 feet above mean sea level(MSL;Table 1). Ground water elevations at the site increased an average of 1.93 feet since the February 2005 monitoring event. The ground water flow direction was inferred using ground water elevation data from the monitoring wells on-site. Well MW-2 was not used to determine ground water flow direction or gradient because it is screened at a deeper interval than the other wells. Ground water flow was inferred to �r be flowing toward the southeast at a gradient of approximately 0.003 foot/foot (ft/ft). Figure 3 fr illustrates the contoured ground water elevations as measured on 24 June 2005. 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLESs 3 No analytes were detected at or above laboratory reporting limits in any of the ground water samples collected and analyzed this quarter. The analytical results of ground water samples are summarized -' Advanced GeoEnvironmental,Inc. :1 !a