Laserfiche WebLink
I25 January 2005 <br /> . AGE-NC Project No 01-0827 <br />' Page 3 of 5 <br />' 2 2 2 Ground Water Sample Collection and Analysis <br /> After allowing wells to achieve a minimum 80% recovery of the pre-purge water volume, a water <br />' sample was collected using the disposable bailer The sample was transferred into three <br /> 40-milliliter(ml)EPA-approved volatile organic analysis(VOA)vials and a 1-liter amber container <br /> without preservative The samples were properly labeled, stored in a chilled container and <br />' transported under chain of custody to Cal Tech Environmental Laboratories (CTEL) a California <br /> Department of Health Services (DHS)-certified analytical laboratory The samples were analyzed <br /> for <br />' * Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g/d) in accordance <br /> with EPA Method 8015 Modified, <br />' • Benzene, toluene, ethylbenzene and total xylenes (BTEX), and the fuel oxygenated <br /> compounds tertiary butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether <br />' (ETBE), tertiary-amyl methyl ether (TAME), methyl-tertiary-butyl ether (MTBE), <br /> 1,2-dichloroethane (1,2-DCA) and 1,2-dibromoethane (EDB) by EPA Method 8260 <br /> 1 • <br /> 3.0. FINDINGS <br />' Ground water flow directions and gradients were inferred from the field data collected on <br /> 03 December 2004 Contaminant Impacts to groundwater were assessed from the laboratory analysis <br />' of the ground water samples collected The DO concentrations and ORP were determined from field <br /> data collected on 28 September and 03 December 2004 (Appendix A) <br /> 1 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' On 03 December 2004,depths to ground water In monitoring wells MW-1 through MW-6 and vapor <br /> wells VW-1, VW-2d, VW-3 and VW-5d ranged from 23 77 to 25 36 feet below the tops of the <br /> casings(btoc) (Table 1) The ground water elevations and gradient were calculated and determined <br />' from depths to groundwater data from monitoring wells MW-1 through MW-5 The August ground <br /> water elevations at the site ranged from 13 87 feet (MW-5) to 14 92 feet (MW-2) below mean sea <br /> level(MSL) The ground water flow direction at the UST release was Inferred to be towards the east, <br />' at a gradient of approximately 0 01 foot per foot (ft/ft) on-site (Figure 3) <br /> 1 <br />' Advanced GeoEnvironmental,Inc <br /> 1 <br />