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Mr. Cecchinl <br /> January 22, 1993 <br /> Page 3 <br /> In order to further assess the significance of petroleum hydrocarbon concentrations in well <br /> UST-1 and the occurrence of free product, if present, HESE will continue to conduct <br /> quarterly monitoring activities at the site. These activities will include purging and sampling <br /> well UST-1 in March and June 1993. <br /> 00000 <br /> Our professional services have been performed using that degree of care and skill ordinarily <br /> exercised under similar circumstances by other hydrogeologists and engineers practicing in <br /> this field. No other warranty, express or implied, is made as to the professional advice in <br /> this report. <br /> Upon your review and approval of this letter report, a copy should be submitted to the San <br /> Joaquin County Public Health Services and the Regional Water Quality Control Board. <br /> If you have any questions regarding the material presented in this report, please do not <br /> hesitate to contact the undersigned at (510) 685-4053. <br /> Sincerely, <br /> ENVIRONMENTAL SCIENCE & ENGINEERING, INC. <br /> Kerry I.efe r Susan S. Wickham, RG 3851 <br /> Senior Staff Geologist Senior Geologist <br /> 1p � <br /> KL/SSW:kl <br /> Enclosures (4) <br /> F\ \54W\QTR12nLTR <br /> Q <br /> rt <br />