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, 3 <br /> S <br /> V <br /> ;1 15 November 2004 <br /> ' AGE-NC Project No 96-0235 - <br />' Page 2 of-5 , , - I _ I Y <br /> 1 <br /> 1} <br /> 51 <br /> After recording water level measurements,wells MW-1 through MW-5, MW-6 (A and B), MW-7, <br />' MW-8'(A and B), MW-9, MW-10, MW-11 (A and B) through MW-15 (A and B) and EW-2 were <br /> purged of standing water utilizing a,Waterra inertial,pump or a dedicated disposable plastic bailer, <br /> „ `between 5 and 57 gallons of water were removed from each of the wells With the exception of wells <br /> ' +I <br /> MW-11B and MW-15B, a minimum of 3 casing-water volumes per well was evacuated, wells <br /> MWA IB and MW-15B were bailed dry prior to evacuating 3 Lcasing-water volumes For the <br />' intermediate and deep wells,,ground water was purged from near the top of the water column to <br /> ` remove water trapped within the non-screened interval of the well casings Ground water <br /> temperature,pH and conductivity were measured at regular purge-volume intervals using an,Oakton <br />' water analyzer Field sheets and data are included in Appendix B Purged water was stored on-site <br /> in labeled, 55-gallon Department of Transportation(DOT)-approved drums <br /> 2 1 2' Collection and Analysis of Ground Water Samples <br />' Water samples were collected from each purged well utilizing the discharge tube of the Waterra <br /> inertial pump or a new, dedicated disposable plastic bailer after allowing the wells to achieve a <br /> minimum 80%recovery of the pre-purge water volume Each water sample was transferred into 40- <br /> 10 ml volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample <br /> preservative and into 1-liter amber bottles without 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, and were analyzed for <br />' Total petroleum hydrocarbons quantified as gasoline (TPH-g) and as diesel (TPH-d) in <br /> , <br /> ' accordance,with EPA Method 8015M, ; <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 /> a nyl methyl ether (TAME), tertiary-butyl-alcohol (TBA), 1,2-dibromoethane (EDB) and <br /> 1,2-dichloroethane (1,2-DCA) in accordance with EPA Method 8260B <br /> 3.0. FINDINGS - <br /> The hydrocarbon-impact to ground water was quantified by laboratory analysis of the ground water <br /> e samples Ground water elevation and gradient was determined by utilizing data collected from the <br /> field <br /> i 1 � <br /> Advanced GeoEnvironmental,Inc <br /> r <br /> I 1 <br /> r5 1 Y f <br />