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— <br />PUBLIC HEALTH SERVICES <br />SAN 10AQUIN COUNTY <br />LOCI KHANNA MD. M P H <br />Health Officer <br />P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br />(209) 468-3400 <br />1— j7 <br />DONNA SANTINI GARDNER <br />1206 STRUCK <br />ORANGE CA 92667 <br />RE: Donna Gardner Property <br />26056 Thornton Road <br />Thornton CA 95686 <br />Site Code: 1864 <br />San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br />review of the "Quarterly Monitoring Report, April through September 1993" dated December 9, 1993 and <br />prepared by RESNA. PHS/EHD has the following comments for your consideration. <br />Groundwater contamination continues to be evidenced in samples collected from MW2, MW3, and MW4. <br />RESNA requested that the sampling frequency of MW1 be reduced to annually and MW5 and MW6 be <br />reduced to semi-annually. PHS/EHD grants the reduction in sampling frequency since these wells <br />historically have either detected slight or no contamination. Quarterly monitoring of MW2, MW3, and <br />MW4 should continue <br />Residual soil contamination provides a source of contamination to groundwater. The levels of <br />contamination have fluctuated with changes in the depth to groundwater. A work plan dated July 22, 1992 <br />was submitted to perform limited excavation which would reduce the source of further groundwater <br />contamination. PHS/EHD approved the work plan in correspondence dated August 17, 1992. In order to <br />remain in compliance with PHS/EHD directives, the work outlined in the approved work plan must be <br />performed by July 22, 1994. <br />If you have any questions or wish to schedule a site inspection, please contact Mary Meays, Senior REHS, <br />of my staff at (209) 468-0337. <br />Jogi Khanna, M.D., M.P.H. <br />Health Officer <br />Donna Heran, REHS, Program Manager <br />Environmental Health Division <br />DH/MM/GARDNER <br />c: Elizabeth Thayer, CVRWQCB <br />c: John Lane, RESNA <br />c: Al Hoslett, Wilson, Hoslett and Whitridge <br />c: Ron Rail, SJCUMD <br />A Division of San Joaquin County Health (ire Services