Laserfiche WebLink
I <br /> 31 April 2006 <br /> AGE-NC Project No 97-0326 <br /> IPage 2 of 6 <br /> subtracting the measured depth to ground water from the surveyed casing elevation(Table 1) Free- <br /> phase petroleum product was not observed in well MW-1 during the sampling event <br />' After water levels were measured, a Waterra inertia pump was used to purge each well <br /> Approximately 9 5 gallons of water (a minimum of three casing water volumes per well) were <br /> purged from single-level well MW-1, 6 to 6 5 gallons were purged from single-level wells MW-2, <br /> MW-3, and MW-7, and between 0 5 and 4 gallons were purged from multi-level wells MW-8A-D <br /> and MW-9A-D <br />' Ground water temperature,pH,and conductivity were measured at regular intervals during purging <br /> using an Oakton water analyzer Purged ground water was containerized in properly labeled, <br /> Department of Transportation(DOT)-approved 55-gallon drums and stored on-site Field sheets and <br /> data are included in Appendix B <br /> 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using the dedicated inertia pump tubing, after <br /> 1 • allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br /> sample was transferred into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing <br /> 0 5 ml 18%hydrochloric acid solution as a sample preservative After collection, the samples were <br /> properly labeled, placed in a chilled container, and transported under chain of custody to Cal Tech <br /> Environmental Laboratories (CTEL), a State of California Department of Health Services (DHS)- <br /> certified analytical 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), <br /> 1,2-dichloroethane (1,2-DCA), methanol, and ethanol in accordance with EPA Method <br />' 8260B <br />' 3.0. 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 /> 1 Advanced GcoEnvironmental,Inc <br /> 1 <br />