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f <br /> STATE OF CALIFOpNIA <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> GEORGE DEUKMEJIAN,Governor <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD .� <br /> SACRAMENTO,CA 96827-3098 <br /> 13 September 1989 <br /> Ms. Diane Hinson <br /> Registered Environmental Health Specialist <br /> Environmental Health Division <br /> San Joaquin County <br /> Department of Public Health Services <br /> P.O. Box 2009 <br /> Stockton CA 95201 <br /> CHEVRON SERVICE STATION, 3246 EAST FREMONT STREET, STOCKTON, QUARTERLY <br /> MONITORING REPORT <br /> We have reviewed the 12 June 1989 "Quarterly Monitoring Report" for this site, <br /> prepared by EA Engineering Science and Technology, Inc. The report includes <br /> the analytical results for samples recently obtained from three of the <br /> existing on-site wells. Although the holding times for these samples were <br /> exceeded by the analyzing laboratory, followup samples were obtained and the <br /> results were similar to those reported. Based on these results, the <br /> contamination does not appear to have migrated to the boundaries of the site. <br /> Ground water elevations in this area of Stockton have declined below the <br /> screened intervals of several of the existing on-site wells. This decline in <br /> ground water elevations is apparently a trend. Therefore we do not anticipate <br /> that the dry wells will be able to be sampled in the near future. Although <br /> the contaminants apparently have not migrated off site, significant levels of <br /> contamination were previously detected in many of the wells which are now dry. <br /> We recommend installation of additional monitoring wells to replace some of <br /> the dry monitoring wells. These wells are needed to provide information <br /> necessary for the development of an appropriate remedial action plan. <br /> If you should have any questions, please call me at (916) 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br />