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il% California Regional Water Quality fontrol Board <br /> j Central Valley Region <br /> Winston H. Hickox Sacramento Main Office Gray Davis <br /> Secretar7-for Internet Address: http://www.swrcb.ca.gov/—rwgcb5 Governor <br /> Environmental 3443 Routicr Road,Suite A,Sacramento,Califomia 95827-3003 <br /> Protection Phonc(91 G)255-3000•FAX(91 G)255-3015 <br /> 1 December 2000 -- <br /> Mr. Michael Kalish - <br /> County of San Joaquin <br /> Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF THIRD QUARTER 2000 MONITORING REPORT, CORRAL HOLLOW <br /> SANITARYLANDFILL, SANJO.AQUINCOUNTY(CASENO. INRO <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, Third Quarter 2000, <br /> Groundwater and Surface Water Monitoring Report, dated 15 October 2000. <br /> In the monitoring report, the County discussed and illustrated an upward trend for volatile organic <br /> compounds (VOCs), total dissolved solids, specific conductance and chloride in MW-5. This trend may <br /> be indicative of leachate impact to groundwater. The county has also reported, however, high <br /> concentrations of VOCs in landfill gas near monitoring well MW-5. Additionally, the county has <br /> conducted an evaluation of the extent of VOCs in the area of MW-5 and submitted the documentation <br /> for the evaluation on 31 July 2000. Regional Board staff is in the process of reviewing that report and <br /> will comment separately on it. The county has reported that a landfill gas collection system is being <br /> installed and will be completed by March 2001. The county has proposed operating the landfill gas <br /> collection system while continuing to monitor the groundwater to determine if collection of the landfill <br /> gas will remediate the VOCs in groundwater in the area of MW-5. Future groundwater monitoring <br /> reports should therefore also include adequate documentation of the operation of the landfill gas <br /> collection system to facilitate the Regional Board staff in assessing its potential effects, as well. <br /> t <br /> I have attached a copy of the Monitoring Report Compliance Checklist that will be included in the case <br /> file for Corral Hollow Sanitary Landfill. Please note the comments included at the end of the checklist. <br /> Figure 2 of the report has shown MW-5 as a"deep"well and should be corrected prior to submittal of <br /> the Fourth Quarter report. <br /> If you have any questions or comments regarding my review,please call me at(916) 255-3137. <br /> d <br /> WENDY W. ARANO <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon, REHS, Public Health Services, Environmental Health Division <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />