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AM Santa Fe Pacific Pipeline Partners, L.P. J-6075 <br /> L� July 13, 1992 Page 3 <br /> Downgradient Well in the Eastern Site Corner <br /> The existing well M-4 will serve as a downgradient well in the eastern <br /> portion of the site. <br /> Investigation of Vertical Groundwater Gradient <br /> It is our understanding through discussions with the RWQCB that the <br /> Technical Committee has proposed the installation of an offsite well cluster, <br /> located east of existing monitoring well M-3. Based on the technical <br /> committee's discussion with SFPPL, it was originally proposed that a well <br /> cluster would be installed within the SFPPL Terminal property. Because a <br /> well cluster will be placed offsite, the RWQCB has requested that SFPPL <br /> install a well cluster on the SFPPL Terminal property to determine the <br /> vertical gradient and delineate the vertical extent of hydrocarbon impacted <br /> groundwater. <br /> During this proposed preliminary investigation, SFPPL does not intend to <br /> investigate the lower aquifers or vertical groundwater gradient beneath the <br /> site. However, following the completion of this preliminary investigation, <br /> SFPPL will evaluate and propose, if necessary, an additional phase of <br /> investigation to assess the vertical gradient and extent of petroleum <br /> hydrocarbon impact in the lower water-bearing zones. <br /> As discussed, we assume that this letter constitutes your approval to initiate <br /> work at this site as presented in the Work Plan and this addendum. The <br /> tentative start date for this work will be July 21, 1992. If you have any further <br /> questions, please call our office. <br /> Sincerely, <br /> ?zudson <br /> SER, INC. Dharme Rathn ake, P.E. <br /> Project Geologist Technical Manager <br /> PBH/DR:ah <br />