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� z <br /> Z&1 <br /> A S O C I A T E g <br /> C <br /> SAMPLING ACTIVITIES <br /> On March 28, 2002, ATC <br /> wells MW1 thiou h Associates personnel collected ro <br /> 2 Prior to cone Bion of I p and CW The locations of theg andwater samples from <br /> groundwater s monitnrin monitoring <br /> and temperature were measured in d1e amples, the depth g wells are shown on Figure <br /> casing volumes was purged from p to water, pH, electrical conductivity, <br /> monrtgring wells and recorded <br /> and samples were each well prior to sam Iii1 A minimum of three well <br /> collected from each P g The wells were allowed to recover <br /> groundwater samples were collected well iisin <br /> well Groundwater well , dissolved ox S dedicated disposable bailers <br /> Purge and sample Zags are containednn concentrations <br /> were After <br /> measured in each <br /> The groundwater s Attachment i <br /> Laboratories, Inc amples collected from each well were subrmied t <br /> ethyl benzene' <br /> Xylenes <br /> yle esLBTE ert No 2359 o State-certified Ar on <br /> ( X) utilizing ) for chemical analysis of TpH g <br /> (MTBE), ethyl tern EPA methods 80I S/&020 g, benzene, toluene, <br /> (TAME tertiary butyl ether (ETBE and methyl tern <br /> )? di-isopropyl ether (DIPE }, tertiary butyl alcohol ' butyl ether <br /> utilizing EPA method 5260 )� I,2-dichloroethane (1,2-DCA), (TBA), tertiary amyl ether <br /> and ethyl dibromide (EDB) <br /> ANALYTICAL,RESULTS <br /> TPHg and/or BTEX were detected above Tabora <br /> collected from wells MWI tory method detection limits iii t <br /> from wells MW2, MW4 ' MW3, MWS, MW6a and MW he samples <br /> ranging from � , MW5, MW6, MWI0 7 The groundwater samples <br /> 7 parts Per billion ' and CW contained Low concentrns of collectedE <br /> samples collected from (Ppb) to 11 Ppb b MTBE <br /> water <br /> concentrations ofMTg�ells MW1 Y EPA method $260 <br /> were elevated due to , but the detection Iimi � h�S' and MW9 did not contain detectable <br /> detectable cc�ncen�-ationsof dilutions factors sample in wells MWI eteCtable <br /> None of the groundwater ' MW3, and MW7 <br /> collected from well CW ETBE, TBA, TAME DIpE samples collected contained <br /> contained no detectable Co.. ntrations,o I)CA, or EDB <br /> than a Low concentration of 7'he sample <br /> continue to contain the MTBE C�oundwater samples from Wells oI Ihydrocarbon, other <br /> results is presented in Table <br /> concentrations <br /> Laborato of TPH9 and BTEX , MW3, and MW7 <br /> contained in Attachment ry data sheets an A summary of analytical <br /> hment 2 andchain <br /> docentation are <br /> GROUNDWATER FLOW DIRECTION <br /> Water level measurements were collected from we <br /> 28, 2002 Water levels ran IIs MWI through <br /> elevations, representing ranged from 22 09 to 25 44 feet below MWI0, and CW on March <br /> feet since December 201 average increase in the the tops <br /> water table elevation of a f the well casing <br /> contour ma The water level data <br /> P The <br /> 3) Assumingwere used to develop approximately 0 59 <br /> the uppermost a that horizontal IS use is the groundwater elevation <br /> quifer beneath the site flowed towards the northeat condition, Prevail ro <br /> g andwater in <br /> W lw0rdpr01625961qu,,jyligr-2002 doc Td <br /> Yhe average h <br /> 3 <br /> raulic <br />