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PUBLICwHEALTH SERVICES <br /> SAN JOAQUIN COUNTY r: <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer '`• <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> BRETT HUNTER �� U <br /> ENVIRONMENTAL ENGINEER <br /> CHEVRON USA <br /> P O BOX 5004 FEB 2 8 1994 <br /> SAN RAMON CA 94583-0804 <br /> RE: Ron's Chevron #9-0557 SITE CODE: 1039 <br /> 139 South Center <br /> Stockton, CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has completed review of the "Additional Assessment Report" dated January 21, 1994 and <br /> prepared by Groundwater Technology. PHS/EHD has prepared the following comments <br /> for your consideration. <br /> The report included the analytical results of soil samples collected on September 14, 1993 <br /> during the installation of MW6 and of groundwater samples collected on November 22, <br /> 1993. <br /> Soil contamination was evidenced at 10 and 20 feet below ground surface of up to 12 <br /> ppb toluene and 22 ppb xylene. Soil samples were not collected at shallow depths for <br /> analysis during the installation of MWl - MW4. Additional investigation to define the <br /> extent of soil contamination will be necessary. Groundwater contamination was <br /> evidenced in all monitoring wells with the exception of MW4. It may be necessary to <br /> install an additional monitoring well in the area of MW6 to further define the <br /> groundwater contamination documented in this area. <br /> The report did summarize recent activities, but did not fulfill the reporting requirements <br /> of PHS/EHD nor the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB). Please refer to Annendix A - Reports dated August 30, 1991 and <br /> prepared by the CVRWQCB, for further information regarding the contents of quarterly <br /> status reports. <br /> Please prepare and submit by March 31, 1994 a workplan addendum to continue the soil <br /> investigation. Work should be scheduled in April 1994 and the results reported in the <br /> second quarter monitoring report due June 15, 1994. <br /> A Division of San Joaquin County Health Care Services <br />