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E! <br /> BUD <br /> Monitoring of off-ai[e Well <br /> ' !! <br /> 141 N.EI Dorado Ave.,Stockton,CaVornia <br /> E <br /> lE�f <br /> `I <br /> You have indicated that you would like Shell to monitor the well to assess potential <br /> hydrocarbon migration from the 141 N. El Ddrado site. Because the well has already ' j <br /> been impacted from an unknown hydrocarbon source, we do not believe sampling it will <br /> provide any information useful to the SJCPHDIEHD with regard to the Shell site. It 1 <br /> should be noted that groundwater recovery'] from the downgradient wells has been <br /> ongoing at the Shell site since March 1993, controiling any potential off-site migration. : <br /> Also, since April 1991, TPH as gasoline concentrations in the farthest downgradient well, <br /> MW-4, have never been as high as the 790 ppb reported in the American Savings Bank <br /> well. This clearly implies another source and further questions the value of sampling the <br /> well to aid in the Shell site investigation. _ r <br /> if you have any questions or comments, please call Fugro at (916) 782-2110, or Mr. Lynn <br /> Walker of Shell at (510) 675-6168. <br /> fE M1 <br /> Sincerely, <br /> FUGRO WEST, INC. <br /> �� Et <br /> if v <br /> Paul GraffE <br /> Senior Hydrogeologist <br /> CA Registered Geologist No. 5600 .E <br /> .E <br /> EE <br /> cc: L. Walker, Shell Oil Company <br /> J. Weber, C.M. Weber Enterprises, In'c. <br /> E. Thayer, Central Valley Regional Water Quality Control Board <br /> D. Poulsen, Fugro West, Inc. I{E <br /> ff <br /> J. Zolezzi, Ne.umillerand Beardslee <br /> fE <br /> EE <br /> ;k <br /> f� <br /> EE. <br /> E <br /> f <br /> E <br /> 1� <br /> !!Ij <br /> i� <br /> �1 <br /> 93473011.PLT 2`' <br /> �yE <br /> c; <br />