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4. <br /> California Regional Water Quality Control Board <br /> Central ll ion <br /> Valley Region <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 11 October 2000r <br /> Mr. Michael Kalish <br /> County of San Joaquin <br /> Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEWOF,SECONO QUARTER2000MONITORINGREPORT, CORRAL ROLLQ ' <br /> SANITARYLANDFILL,SANJOAQUINCOUNTY(CASENO IN96) <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, Second Quarter 2000, <br /> Groundwater and Surface Water Monitoring Report, dated 15 July 1999. <br /> The monitoring report indicates an upward trend for volatile organic compounds (VOCs), total dissolved <br /> solids, specific conductance and chloride in MW-5. This trend may be indicative of leachate impact to <br /> groundwater. The county has also reported,however,high concentrations of VOCs in landfill gas near <br /> monitoring well MW-5. Additionally,the county has conducted an evaluation of the extent of VOCs in <br /> the area of MW-5 and submitted the documentation for the evaluation on 31 July 2000. Regional Board <br /> staff is in the process of reviewing that report and will comment separately on it. The county has <br /> reported that a landfill gas collection system is being installed during September and October. The <br /> county has proposed operating the landfill gas collection system while continuing to monitor the <br /> groundwater to determine if collection of the landfill gas has beneficial impacts to the VOCs in <br /> groundwater in the area of MW-5. Future groundwater monitoring reports should therefore also include <br /> adequate documentation of the operation of the landfill gas collection system to facilitate the Regional <br /> Board staff in assessing its potential effects, as well. <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 /> If you have any questions or comments regarding my review,please call me at (916) 255-3137. <br /> ' ao'4�-b <br /> t1r ARANO <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon, RENS, Public Health Services, Environmental Health Division <br /> California Environmental Protection Agency <br /> �*Recycled Paper <br />