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.� <br /> California Regional Water Quality 77ontroloar <br /> Central Valley Region <br /> Steven T.Butler,Chair (a <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwqcbS <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95828- 0 <br /> Phone(916)255-3000•FAX(916)255-304151E <br /> � I <br /> 11 May 2000 <br /> 12, 400 <br /> Mr. Wes Johnson <br /> County of San Joaquin ENV i r\ .�r 1�hTH <br /> Department of Public Works PERMIT/SERVICES <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OFMONITORINGREPORTS, CO)ML ROLL 0 WSANITARYLANDFILL,SAN <br /> JOA Q UIN CO UN TY(CA SE NO. 1896) <br /> Regional Board staff has reviewed two monitoring reports for the Corral Hollow Sanitary Landfill: <br /> • Corral Hollow Sanitary Landfill, Fourth Quarter and Annual Report for 1999, Groundwater <br /> and Surface Water Monitoring Report, dated 15 January 2000, and <br /> • Corral Hollow Sanitary Landfill, First Quarter 2000, Groundwater and Surface Water <br /> Monitoring Report, dated 15 April 2000. <br /> Increasing trends for monitoring well MW-5 are noted for tetrachloroethylene, electrical conductivity, <br /> TDS, and chloride. The county has already submitted a Workplan for further investigation of the VOCs <br /> detected in MW-5. Your letter of 5 April 2000 indicates that field work is expected to commence on 5 <br /> June 2000 and will be completed by 16 June 2000. You indicate that a report of findings will be <br /> submitted to the Regional Board within,45 days of completing the field work. Given the schedule <br /> provided,we anticipate receiving a report by 31 July 2000 that will establish compliance with Title 27 <br /> of the California Code of Regulations. <br /> I have attached a copy of both the Monitoring Report Compliance Checklists that will be included in the <br /> case file for Corral Hollow Sanitary Landfill. Please note the conunencs included at the end of each <br /> checklist. Of primary note is that the laboratory has used two different methods for the VOC analyses <br /> during the past two quarters. The lower detection limits can be achieved by U.S. EPA Method 8260B <br /> and we prefer that analyses be done by that method. <br /> If you have any questions or comments regarding my review,please call me at(916)255-3137. <br /> Iti' C <br /> WEND ARANO <br /> Associate Engineering Geologist <br /> cc.: Ro> ert McClellon, REHS, Public Health Services, Environmental Health Division <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />