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I <br />��! +V" u r t >r't 1 R-- c :.. .... - — r ^z .. d ..>»r-=' t — 4' i ' ` ..,,�a ! . - j szr• q�I I'd;Wl,,,,.,.r- x„r, <br /> q �' roil <br /> F <br /> I I <br /> 07 January12004 <br /> • <br /> AGE-NC Protect No 00-0769 <br /> Page 21of 7 v' <br /> " � 1 <br /> 212 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> ,Ground water samples were collected from wells MW-1,MW-2A, MW-2B, MW-3A and MW-3B <br /> ' utilizing new,2-inch diameter=disposable polyethylene bailers Samples were collected frornrwells <br />' MW-4A „through MW-9D, utilizing %-inch diameter polyethylene tubing The samples were <br /> ' transferred Into 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% <br /> hydrochloric acid asra preservative Care was taken to ensure that visible air bubbles were not present <br />' in the vials after filling and capping The sample vials were then labeled with the monitoring well <br /> 3 designation, date, time of sampling and the sampler's initials Following collection, samples were <br />' placed in a chilled container and transported under chain-of-custody to Cal Tech Environmental <br /> Laboratories (CTEL), a California Department of Health Services (DHS)-certified analytical - <br /> laboratory, arid analyzed for ' <br /> ITotal petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 8015 Modified, and <br /> VOCs,Including benzene,toluene,ethylbenzene and xylenes(BTEX)and the fuel additives <br /> methyl tertiary butyl ether (MTBE), dl-Isopropyl ether (DIPE), ethyl tertiary butyl ether <br /> (ETBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA); methanol and <br />' ethanol, 1,2 dibromoethane (EDB) and 1,2-dichloroethane (1,2-DCA) in accordance with <br /> EPA Method 8260B <br /> I <br /> 3 ' <br /> r I , <br /> 3.0. FINDINGS <br /> I ' e <br /> Ground water elevation, flow direction and gradient were inferred from field data The hydrocarbon- <br /> impact rto'ground water was quantified by laboratory analysis of ground water samples <br /> Ir r 1 <br /> , <br /> ' M <br /> 3 1 I 'GROUND WATER ELEVATION AND GRADIENT <br /> Depth to,ground water was between 23 40 feet (MW'7A) and 29 37 feet (MW SE) below the tops <br /> of the wll casings on`17 February 2003 Relative ground water efevations ranged from 13-37 feet <br />' . (MW-7A) to 18 58 feet (MW-7D)'below' mean sea level (MSL) The ground water elevation data <br /> collected from the site and the add acdnt Arrc Pump and Weld site were plotted for the informal HU-1 <br /> through HU-4 hydrogeologic flow,units` Ground water elevation data is presented in Table 1 and <br />' contoured ground water elevation"data is'presented In Figures 3-6 The elevation and gradient far r <br /> each unit is described below <br /> " r 1 <br /> 1 <br /> v� <br /> e t <br /> Advanced GeoEnvironmental,Inc i 1 i <br /> I, <br /> i 1 <br /> ° <br /> IF ' r <br /> r <br />