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M. Scott Mansholt - 3 - 27 March 2009 <br /> Banta Road-UPRR <br /> Based on our review, Central Valley Water Board staff have the following comments: <br /> • The lateral and vertical extent of petroleum-affected soil and groundwater has been <br /> adequately defined and additional characterization is not needed. <br /> • Based on the analytical results, concentrations of several mineral constituents detected <br /> in shallow groundwater exceed WQOs and/or applicable U.S. Environmental Protection <br /> Agency drinking water standards. <br /> • An environmental screening evaluation is recommended in order to proceed with <br /> consideration of a No Further Action Required determination. <br /> • A final determination for the Site cannot be made until an environmental risk evaluation, <br /> including an ecological receptor evaluation, is submitted. <br /> By 1 October 2009, please submit the environmental risk evaluation and a summary report <br /> requesting a No Further Action Required determination for the Site. <br /> If you have any questions or comments, please contact Dean Hubbard at (559) 445-5179. <br /> ct), <br /> V <br /> SHELTON R. GRAY C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> P.G. No. 6357 <br /> cc: Harlan Knoll, San Joaquin County EHD, Stockton <br /> Ken Mahon, California Northern Railroad, Woodland <br /> Alfred and Mable Pombo, LTD PTP <br /> 6645 Delta Avenue, Tracy, CA 95304 <br /> Michael Jenkins, SAIC, Sacramento <br />