Laserfiche WebLink
21 November 2003 <br /> AGE-NC Project No 02-0964 <br /> Page 2 of 4 <br />' preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling <br /> and capping The ground water sample containers were subsequently labeled with the well <br /> designation, date, time, and sampler's initials <br /> 2 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> IEach ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br /> shipped to Cal Tech Environmental Laboraton es(CTEL)a California Department of Health Services <br /> (DHS)-certified analytical laboratory Selected samples were analyzed for <br /> • Tota1 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 /> isopropyl ether(RIPE),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 andgradient were determined from field data collected on <br /> 16 October 2003, 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 October 2003 ground water monitoring event, depths to ground water ranged between <br /> 29 30 and 29 89 feet below the tops of well casings Ground water elevations were calculated to be <br /> between 17 61 feet(MW-3)and 18 94 feet(MW-1)below mean sea level(MSL) The ground water <br /> was inferred to flow northeast at a gradient of approximately 0 01 ft/ft (Figure 3) Ground water <br /> table elevation at the site decreased an average 1 57 feet between the April and October 2003 ground <br /> water monitoring events <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Three ground water samples were collected and submitted for laboratory analysis The analysis <br /> detected TPH-g in ground water sample MW-1 at a concentration of 6,300 micrograms per liter <br /> I <br />