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PUBLIC 'riEALTH SERVICES <br /> SAN JOAQUIN COUNTY x� <br /> ENVIRONMENTAL HEALTH DIVISION = .x <br /> N: X <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Offic <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 2 Z 3 F <br /> 2091468-3420 <br /> MAf u 01 6 <br /> PAMELA LOPEZ <br /> PO BOX 393 <br /> THORNTON CA 95686 <br /> Re: Lopez Property Site Code: 1930 <br /> 26500 Nowell Road <br /> Thornton CA <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the "Results Report - Soil and Ground Water Investigation" dated March 1996 <br /> and prepared by Fugro West. PHS/EHD has the following comments for your consideration. <br /> On February 5, 1996 the most recent investigation to determine the extent of soil and groundwater <br /> contamination was initiated. Five soil borings were drilled, three of which were converted into <br /> monitoring wells, MW1 - MW3. On February 13, 1996 groundwater samples were collected from <br /> the newly installed monitoring wells. Both soil and groundwater contamination were evidenced. <br /> The extent of the soil contamination associated with the former underground storage tank appears <br /> to be defined by results of soil samples collected from SB-A1, MW3, and MW1. The vertical extent <br /> of soil contamination was defined to 33 feet below grade by SB-A2 that was located in the area of <br /> the former tank. <br /> Groundwater contamination was detected in the samples collected on February 13, 1996 from <br /> MW1 and MW2. <br /> PHS/EHD concurs that additional groundwater monitoring and sampling will be required to further <br /> evaluate the extent of groundwater contamination. Please initiate quarterly monitoring, with the <br /> next quarterly report, third quarter, due October 31, 1996. <br /> Also, based on available information, the soil contamination which has been evidenced will continue <br /> to act as a source of contamination to groundwater. Please submit a work plan to evaluate <br /> remedial alternatives for soil and groundwater contamination with the next quarterly report due <br /> October 31, 1996. <br /> If you have any questions or comments, please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> �Environmental Health Division <br /> Mary Meays, Senior REHS �Margar o, R1=H <br /> V"'� <br /> Site Mitigation Unit Lead Senior <br /> MM126500.NOW <br /> cc: Elizabeth Thayer, CVRWCQB <br /> George Lockwood, SWRCS <br /> Alan Klein, Fugro West 1050 Melody Lane, Suite 160 Roseville CA 95678 <br /> A Division of San Joaquin County Health Care Services <br />