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PES Environmental, Inc. <br /> Eleanor Ratliff <br /> September 9, 1991 <br /> Page 3 <br /> If you have any further questions regarding these issues, please do not hesitate to call either <br /> of the undersigned at (415) 898-3531. <br /> Yours very truly, <br /> PES ENVIItONMENTAL, C. <br /> Keith M. O'Brien, R.G. <br /> Principal Hydrogeologist <br /> Andrew A. Briefer, P.E. <br /> Senior Engineer <br /> Reference <br /> Todd, David K., 1980. Groundwater Hydrology, John Wiley & Sons, New York <br /> PC: Jeff Werner <br /> Keith Howard, Esq. <br /> Elizabeth Thayer <br /> kobvti\mtiM.wp5 <br />