Laserfiche WebLink
28 February 2005 <br /> AGE-NC Project No 97-0326 <br /> Page 2 of 6 <br /> utilizing a Solinst water level meter Ground water elevation in each well was calculated by <br /> subtracting the measured depth to ground water from the surveyed casing elevation (Table 1) <br /> After water levels were measured, a Waterra inertia pump was used to purge each well <br /> Approximately 4 5 gallons of water (a minimum of three casing water volumes per well) were <br /> purged from single-level wells MW-2,MW-3,and MW-7,between 0 3 and 3 75 gallons were purged <br /> from multi-level wells MW-BA-D 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 /> Approximately 0 15 foot of free petroleum product was detected in well MW-i A disposable bailer <br /> was used to purge the well until the product was not visible <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Water samples were collected from each purged well except MW-1 using the dedicated inertia pump <br /> tubing,after allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume, <br />' well MW-1 was not sampled due to the presence of free petroleum product Each water sample was <br /> transferred into three 40-milliliter(ml)volatile organic analysis(VOA)vials containing 0 5 ml 18% <br /> hydrochloric acid solution as a sample preservative After collection, the samples were properly <br /> 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 ternary-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 /> I8260B <br /> Advanced GcoEnvironnlental Inc <br />