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- .,,"'- � .. - ..:- a.. _.,. 1.,;,-^� y..� �,. -.,- ..,W�` ,... 'u '- t�^i+` r r - ' - H- -- ,. � z✓— �- > - - t."��..>a.rr-a-r .r �f:a.. 20 OT i ✓ + 1 1 ` � „ ctober 2004 ' AGE-NC Project No 95-0135 Page 2 of 5 1 a r , , 211 WELL MONITORING AND EVACUATION L - On 28 May 2004,a Solinst water level meter was used to measure the depth to ground water in each ' well relative to the top of the well casing The ground water elevations and gradient were determined from this data(Table 1) a , After recording water level measurements, disposable plastic bailers were used to purge shallow monitoring wells MW-1B,MW-2B, and MW-3B and a Waterra Hydrolift Pump was used to purge deep monitoring wells MWAA, MW-2A, and MW-3A of standing water Approximately 6 to ' 9 gallons of water(a mlmmum of 3 casing water volumes per well)were purged from shallow wells MW-1B, MW-2B, and MW-3B, between 18 and 19 gallons of water were purged from deep wells MW-IA, MW-2A, and MW-3A Ground water temperature, pH, and conductivity were measured s ' at regular intervals during purging using an Oakton water analyzer Field data logs are provided in Appendix B Purged water was temporarily stored on-site in 55-gallon Department of Transportation (DOT)-approved drums pending proper disposal 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using the pre-dedicated,disposable bailers or Waterra Hydrolift Pump after allowing the well to achieve a minimum 80%recovery of the pre- purge water volume The samples were transferred into laboratory-supplied, 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid solution as a sample preservative The sample vials were then labeled with the monitoring well designation, "date and time of sampling, and the sampler's initials and transported in a chilled container under chain of custody to Cal Tech Environmental Laboratories, a California Department ` of Health Services (DHS)-certified analytical laboratory, for analysis The samples were analyzed for ' Total petroleum hydrocarbons quantified'as gasoline '(TPH-g) in accordance with EPA Method 8015M • Benzene,toluene,ethylbenzene,and xylene(BTEX)and methyl tertiary-butyl ether (MTBE) . ' in accordance with EPA Method 8260B, II • The fuel oxygenates tertiary butanol(TBA),di-isopropyl ether(DIPE),ethyl tert-butyl ether (ETBE), tert-amyl methyl ether (TAME), and MTBE ;n accordance 'with EPA Method 8260B, and • The fuel scavengers ethylene dibromide (EDB) and 1,2 dichloroethane (1,2 DCA) in . accordance with EPA method $260B ' r P ' Advanced GeoEnviron mental,Inc ,