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. 19 January 2004 <br /> AGE-NC Project No 96-0235 ; 'I <br /> Page 2 of 8 <br /> After recording water level measurements, during the September event, each of the 24 wells was <br /> purged of standing water utilizing a Waterra inertial pump or a dedicated disposable plastic bailer, W <br /> between 5 and 58 gallons of water were removed from each of the wells (a minimum of 3 casing- <br /> water volumes per well) For the Intermediate and deep well's, ground water was purged from near <br /> the top of the,water column to remove water trapped within the non-screened interval of the well - <br /> casings Ground water temperature, pH and conductivity were measured at regular purge-volume <br /> Intervals using an Oakton water analyzer Field sheets and data are Included In Appendix B Purged <br /> water was stored on-site in labeled, 55-gallon DOT-approved drums ' <br /> C <br /> I <br />' During the November event,wells MW-1,MW-2,MW-3 and MW-6(A and B)through MW-15 (A <br /> and B) were purged of standing water utilizing a Waterra Inertial pump or a dedicated disposable <br /> plastic bailer, between 3 5 and 25'gallons of water were removed from each of the wells With the " <br />' exception of well MW-12B, a minimum of 3 casing-water volumes per well was evacuated, well <br /> MW-12B was balled dry prior to evacuating 3 casing-water volumes For the Intermediate and deep <br /> wells, ground water was purged'from near the top of the water column to remove water trapped ' <br />' within the non-screened interval of the well casings Groundwater temperature,pH and conductivity I <br /> were measured at regular purge-volume intervals using an Oakton water analyzer Field sheets and <br /> . f <br /> data are included in Appendix B Purged water was stored on-site in labeled, 55-gallon DOT- <br />' ! approved drums' Wells MW-4, MW-5, MW-7, EW-1 and. EW-2 were not purged and sampled <br /> during the fourth quarter 2003 monitoring event <br /> f <br /> I ' <br /> 2 1 2 Collection and Analysis of Ground Water Samples <br /> I <br /> Water samples were'collected from each purged well using new disposable plastic bailers after i " m far <br /> allowing the wells to achieve a minimum 80%recovery of the pre-purge water volume Each water <br />' sample was transferred Into 40-m1 volatile organic analysis (VOA) vials containing-0 5 ml 18% ; <br /> hydro chlonc acid as a sample preservative and into 1-liter amber bottles without preservative After s <br /> collection, the samples were properly labeled, placed in a chilled container and transported under 4 <br />' chain-of-custody to Cal Tech Environmental Laboratories(CTEL),a State of CaliformaDepartment <br /> of Health Services (DHS)-certified analytical laboratory, and were analyzed for <br /> S � <br /> f „ • Total petroleum hydrocarbons quantified as (TPH-g) and as diesel (TPH-d) in accordance , <br /> with EPA Method 8015M, <br /> • Benzene,toluene,ethylbenzene and total xylenes(BTEX)and the fuel additives'di-isopropyl <br />' ether(D1PE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE),tertiary - , <br /> amyl methyl ether(TANG),tertiary-butyl alcohol(TBA), 1,2-dibromoethane(EDB)and 1,2- I, <br /> dichloroethane (1,2-DCA) In accordance with EPA Method 8260B <br /> 1 <br /> I ' <br /> f <br /> Advanced GeoEnvironmental,Inc <br /> F I 1 <br />