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h � <br /> r 1 M . ,. � \yy M — _ 1 .µre ♦, � ` ' ' , r } � <br /> = a <br /> 02 May 2001 <br /> AGE-NC Protect No 95-0142 <br /> r , <br /> page 2 of 4 r <br /> WATER SAMP <br /> LE COLLECTION 2 2 GROUNDWusable plastic bailers and transferred <br /> 18°!o as a <br /> 0 5 ml hydrochloric acid ( cent <br /> `Water samples were collected from IaVOAIv ars antaning ' <br />' roved 4Q-milliliter (m ) laced 0 a chilled `container for subsequent <br /> into EPA-app Analytical, Inc (MAI) a State of California <br /> sample preservative The vials were <br /> gcC mpb ll placed r samples were analyzed for <br /> transport under chain-Services <br /> custody certified f aboratary Ground Ovate <br /> Department of Health Services(DHS) <br /> the following in accordance with EPA <br /> uantified as gasoline (TPH-g) ,yr, <br /> Total petroleum hydrocarbons q <br /> • lbenzene and total xylenes (BTEX) j <br /> 1Viethod 8015 Modred, benzene,toluene, ethy 1-4 <br /> Volatile aromatic hydrocarbons - t <br /> • in accordance with EPA Method 8020, and but 1 ether (ET BE), <br /> IPE ethyl ternary- and tertiary butanol <br /> oxygenated fuel additives - di-isopropyl ether (D )1 ether (TAME) <br /> • " yg tertiary-amyl methy (1,2-DCA) rn <br /> methyl tertiary-butyl ether(MTBE) 'and 1,2-dichloroetha1e <br /> methanol, ethanol, ethylene dibromide(EDB) ` <br /> (TBA), e with EPA Method 8260, respectively <br /> accordanc <br /> r <br /> 3.0. FINDINGS the-to-water from the h <br /> ' subtracting the measured dep contouring the water <br /> determin <br /> Ground water elevations were and water 1 by unauthorized release on ground water <br /> trans Ground water llow directions here determined by <br /> surveyed casing eleva e 3 The impact of <br /> tan Figur ) the quarter <br /> elevations on a scaled site P { srs of samples collected during } <br /> was quantified by <br /> laboratory analy , <br /> CTION <br /> 1ENT AND DIRE4 <br /> 31 <br /> GROUNDWATER <br /> GRAD , s of the' ell <br /> t the site ranged from 25 47 feet tow2 5 range efram 13 49 feet to 13 So <br /> e th to ground water aallow deeper screened wells <br /> Dp <br /> casings The ground water elevati�obnei the S water elevation at the sna wad d p h data is depicted <br /> feet below mean sea level (msl) - r <br /> ranged <br /> from 13 44 feet to 14 07 below msl The elevation and grou , <br /> iii Table 1ction In oundwater <br /> ' event, grouzitl water flow die nt of 0 008 shallow, <br /> while the <br /> Danng the February 2001 monitoring an average e hydraulic gra <br /> wells was toward the northwest with an <br /> table was toward the 4rthw n all ,)wired monitoring south from the former UST release site <br /> ground water now direction <br /> hydraulic gradient of 0 O16 feet/feet and toward the <br /> average <br /> z - <br />