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14 June 2001 <br /> • AGE-NC Project No 98-0505 <br /> Page 2 of 5 <br /> I monitoring wells relative to the tops of the well casings The ground water elevations and gradient <br /> were determined from these data (Table 1) <br /> After depth to ground water measurements, a minimum of 3 casing-water volumes was purged from <br /> each well to be sampled using a PVC submersible two-stage pump Approximately six to twenty- <br /> four gallons of water were removed from wells MW-1 through MW-8 Temperature, pH and <br /> conductivity of purged ground water were measured at 1-to 4-gallon intervals using a Oakton water <br /> analyzer The field data and field sheets are included in Appendix B Purged water was temporarily <br /> stored on-site in 55-gallon DOT-approved H-17 storage drums pending proper disposal Following <br /> I purging, the depth to ground water was measured to ensure that a minimum of 80% well-volume <br /> recharge had been achieved prior to sampling <br /> 23 GROUND WATER SAMPLE COLLECTION <br /> Monitoring wells MW-2 through MW-8 were sampled on 15 May 2001, MW-1 was purged and <br /> sampled on 16 May 2001 A water sample was collected from each well using a new, clean, <br /> . disposable plastic bailer Immediately upon retneval,the samples were transferred into three 40-m1 <br /> EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The <br /> samples were logged on a chain-of-custody form,stored in a chilled container and transported under <br /> chain-of-custody to McCampbelI Analytical Inc (MAI),a California Department of Health Services <br /> (DHS)-certif ed laboratory The ground water samples were analyzed for <br /> • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in <br /> Iaccordance with EPA Method 8015 Modified, <br /> • Volatile aromatic hydrocarbons-benzene, toluene, ethylbenzene and total xylenes (BTEX) <br /> in accordance with EPA Method 8020, and <br /> • Oxygenated compounds - di-isopropyl ether (DIPE), ethyl tertiary-butyl ether(ETBE), <br /> methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), tertiary butanol <br /> (TBA), and methanol,ethanol,ethyldibromide(EDB)and 1,2-dichloro ethane(1,2-DCA)in <br /> accordance with EPA Method 8260-Modified, respectively <br /> I <br /> 3.0. FINDINGS <br /> Ground water elevations and flow directions were inferred from field data Hydrocarbon-impact to <br /> ground water was characterized from laboratory analytical data <br /> I <br /> Advanced GeoEnvsronmental,Inc <br />