Laserfiche WebLink
i <br /> 09 January 2004 <br /> AGE-NC Project No 97-0326 <br /> Page 2 of 4 <br /> I the presence of free product Water samples were then collected using new disposable plastic bailers <br /> Each water sample was transferred into laboratory-supplied 40-m1 volatile organic analysis(VOA) <br /> vials containing 0 5 ml 18%hydrochloric acid as a sample preservative The sample vials were then <br /> labeled with the monitoring well designation, date, time of sampling and the sampler's initials The <br /> samples were transported in a chilled container under chain-of-custody to Cal Tech Environmental <br /> Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical <br />' laboratory for analysis The samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br />' Method 8015M, and <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives di-isopropyl <br /> ether(DIPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary- <br /> amyl methyl ether (TAME), tertiary-butyl alcohol (TBA), 1,2-dibromoethane (EDB) and <br /> 1,2-dichloroethane (1,2-DCA), methanol and ethanol in accordance with EPA Method <br />' 8260B <br />' • <br /> 30. FINDINGS <br />' Ground water elevation, and flow direction were determined from field data Hydrocarbon-impact <br /> to ground water was quantified by laboratory analysis of ground water samples <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' Ground water was measured at an average depth of approximately 36 72 feet below the well heads <br /> during the October 2003 monitoring event The water level during fourth quarter 2003 was within <br /> the screened intervals of all the wells <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the well head elevations Ground water elevations ranged from 21 87 feet(MW-1)to 21 91 feet <br />' (MW-2 and MW-3)below mean sea level(MSL) However, the depth to ground water(36 41 feet) <br /> at well MW-1 was affected by the presence of free product, the depth was recalculated (36 25 feet) <br /> utilizing the measured thickness of free product in well MW-1 <br />' Dw= Dm - (t8 * db Jdw) <br />' Du, = Corrected depth to water <br /> • Dm =Measured depth to water <br /> IAdvanced GcoEnvironmental,Inc <br /> I <br />