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California Rc ional Water Quality Control Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretary for Sacramento Main Offlce Governor <br /> Environmental Internet Address: http://",w.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 /> 20 March 2001 <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 OFFOURTH QUARTER AND ANNUAL 2000 MONITORING REPORT, CORRAL <br /> HOLL 0 W SANITAR Y LANDFILL, SAN JOA Q UIN CO UNTY(CASE NO. 1896) <br /> Regional Board staff has reviewed the Corral Hollow Sanitary Landfill, Fourth Quarter and Annual <br /> 2000, Groundwater and Surface Water Monitoring Report, dated 15 January 2001. <br /> Monitoring well MW-5 has tetrachloroethylene (PCE) and vinyl chloride detected at concentrations <br /> greater than drinking water Maximum Contaminant Levels and other water quality goals. The county <br /> has submitted documentation that the VOCs detected in MW-5 may be associated with high <br /> .concentrations of landfill gas present in this area of the landfill. The county is installing a landfill gas <br /> collection system and will begin operation this spring. Increasing trends are also noted at MW-5 for <br /> total dissolved solids, chloride, and specific conductance. These trends may be indicative of leachate <br /> impact to groundwater, and will continue to be evaluated after the operation of the landfill gas system is <br /> initiated. Our letter of 2 March 2001 requests that the county submit an amended Report of Waste <br /> Discharge so that staff can revise the WDRs to include information on the LFG system. <br /> It is also noted that groundwater at MW-4 exhibits increasing trends for nitrate and EC, though they are <br /> not above the tolerance limits yet. <br /> SB-1 had a detection of acetone. Also, the field records indicate that groundwater purged from SB-1 is <br /> light red. Field personnel also noted that the"string turned red down casing". This significance of the <br /> red color should be discussed and explained. Please address this further in the next quarterly report. <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. <br /> If you have any questions or comments regarding my review,please call me at (916) 255-3137. <br /> /V,a4a4"6-a <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 /> Qa Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />