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09112'97 16:40 GRiG51–SgCTO -+ 12094640138 <br /> • 903 <br /> Tnaco's technical opiruov is that the Mostptudent approach to dakztniue tho prescnec of TBA and athar c <br /> an initial screenitlg process hn the source afros, As stated n the workplan,groundwater f TDAr n well <br /> sampled in the fiiurth v oR7j70unds 1s <br /> q anter 1997 fern ether balled oxygeuute6 and TBA by LPA wa th�w18260, 7f well Uates .Q11 bo <br /> detected leftter titan MLHE)in this saatp[e,Tosco prlll propose a p,-ngcam to sssess the tr�onitoring well network for <br /> 1116 presence. klowever, if oxygenates are pot detected during axis initial oagns <br /> these analysis from MS'J-2 and will net analyzo at8ar water ramnplas from the wells at the alto,b E <br /> screening process,Tosco will diaoontmue <br /> the <br /> Twoo believes that with the - lou Y PA Me 8260. <br /> the diasbiyed bydrd 'a on pltanailTpe effe vanpg6 otoorutorf th Hell proposed in the attachednaam G5l workplan, will delineate <br /> Ito,unsaturated zona will be evaluated bb the —g system in rbmbving teatthtal b drocarbons from <br /> ev a scss e e I'" SG bf ORC rn e opeeed holing. Satnplts co ec rtmt -2 during the t ird gtrarttr <br /> data Sndicate a confinved decline in hydrotgrbontc nc�4atlo beneath thea e�Tosco assolvcd hydros ubon4. Should <br /> I <br /> his site fre <br /> or low asi clas, <br /> will propose considerefion of <br /> If you,have any questions,please,feel free to auntaet me at(510)217-2s 11 <br /> Sincerely, <br /> Idvrard C,Ralston <br /> Project Manager <br /> cc: Elizabeth"h'yer, CVRWQC6 <br /> 4r^E Glues,t35i <br />