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V <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r. s <br /> A <br /> JOGI KHANNA M.D.,M.P.H. <br /> Health Officer <br /> P.O. Box 2009• (1601 East Hazelton Avenue) • Stockton,California 95201 <br /> (209)468-3400 <br /> BRETT HUNTER <br /> ENVIRONMENTAL ENGINEER F�-� <br /> CHEVRON USAcc:00PO BOX 5004MAR 2 51993 <br /> SAN RAMON CA 94583-0804 <br /> RE: Ron's Chevron #90557 SITE CODE: 1039 <br /> 139 South Center <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Environmental Assessment Report" dated January 25, 1993 and prepared by Groundwater <br /> Technology. PHS/EHD has the following comments for your consideration <br /> A downgradient monitoring well, MW5,was installed on November 4, 1992 to further investigate the <br /> extent of groundwater contamination. Soil contamination was not detected in samples collected and <br /> analyzed at 5, 40, and 45 feet. Groundwater contamination was not detected in the initial ground water <br /> sample collected on November 10, 1992. <br /> Groundwater contamination continues to be evidenced in groundwater samples collected from monitoring <br /> wells, MW1, MW2, MW3, and most recently in MW4. The groundwater gradient continues to be in the <br /> southeast direction with depth to groundwater approximately 47 feet below ground surface. <br /> Both residual soil and groundwater contamination,which has been detected, requires remediation. <br /> Additional investigation to the west of MW-1 is.required to define the extent of contamination in that <br /> direction. Once groundwater contamination has been defined, a "Problem Assessment Report" evaluating <br /> soil and groundwater remedial alternatives should be prepared. Please submit a work plan for the <br /> additional investigation west of MW-1 by May 3, 1993. <br /> If you have any comments or questions, please contact Mary Ways, Senior REHS, of my staff at <br /> (209) 468-0337. <br /> Jogi Khanna, M.D. M.P.H. <br /> Health Office <br /> urie A. Cot a, REHS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:Ib <br /> c: Elizabeth Thayer, CVRWQCB <br /> C: Van Hartnitt, Greyhound Lines, 901 Main Street, Suite 2400, Dallas TX 75202 <br /> c: Bruce Eppler, Groundwater Technology <br /> A Division of San Joaquin County Health Care Services <br />