Laserfiche WebLink
a <br /> 27 May 2004 <br /> AGE-NC Project No 02-0964 <br /> Page 2 of 4 <br /> from each well was transferred into three 40-m1 EPA-approved volatile organic analysis(VOA)vials <br /> containing 0 5 ml 18% hydrochloric acid as a sample preservative and a one-liter amber bottle <br /> without preservative Care was taken to ensure that visible air bubbles were not present In the vials <br /> after filling and capping The ground water sample containers were subsequently labeled with the <br /> well designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> shipped to Cal Tech Environmental Laboratories(CTEL)a California Department of Health Services <br /> (DHS)-certified analytical laboratory Selected samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in <br /> accordance with EPA Method 8015-Modified and, <br /> • Benzene,toluene,ethylbenzene and xylene(BTEX)and the fuel additives methanol,ethanol, <br /> ethylene dibromide (EDB), 1,2-dichloroethane (1,2-DCA), tertiary butanol (TBA), di- <br /> i sopropyl ether(DIPE),ethyl tert butyl ether(ETBE),tert amyl methyl ether(TAME),methyl <br /> tertiary-butyl ether(MTBE)by EPA Method 8260B <br /> 3.0. FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 12 March 2004, the contaminant impact to ground water was assessed from the ground water <br /> laboratory data <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the March ground water monitoring event,depths to ground water ranged between 28 30 and <br /> 28 75 feet below the tops of well casings Ground water elevations were calculated to be between <br /> 16 61 feet (MW-3) and 17 68 feet (MW-1) below mean sea level (MSL) The ground water was <br /> inferred to flow northeast at a gradient of approximately 0 009 ft/ft (Figure 3) Ground water table <br /> elevation at the site increased an average 1 2 feet between the October 2003 and the March 2004 <br /> ground water monitoring events <br /> Advanced GeoEnvironmental,Inc <br />