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California Ilegional I Water Quality lontrol Board <br /> Central Valley Region <br /> Steven T.Butler,Chair <br /> Winston H. Hickox Gray Davis <br /> Secrerary for Sacramento Alain Office Governor <br /> Environmental Imcmct Address: http://w-x%w.swrcb.ca.gov/—rwgcb5 <br /> ProteclionError! 3443 Routier Road,Suite A.Sacramento,California 95527-3003 <br /> Phone(910 2155-3000•FAx(916)255-3015 <br /> 30 January 2002 <br /> Mr. W. Michael Carroll <br /> San Joaquin County Dept. of Public Works <br /> Solid Waste Division <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF THIRD QUARTER 20011110NITORING REPORT, CORRAL HOLLOW <br /> SANITAR Y LANDFILL, SAN JOA QUINCOUArTY(CASE NO, 1896) <br /> We have reviewed the Corral Hollow Sanitary Landfill, Third Quarter 2001, Groundwater and Surface <br /> Water Monitoring Report, dated 15 October 2001. <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 continues to indicate leachate is <br /> impacting groundwater. The county has also reported increasing concentrations of nitrate and specific <br /> conductance in MW-4. MW-4 initial sampling round detected benzene, toluene, and 1,2,3- <br /> trichlorobenzene. A resample was performed on 19 September, 2001. Results showed non-detect for <br /> previously detected VOCs. <br /> Future groundwater monitoring reports should include adequate documentation of the operation of the <br /> landfill gas collection system to facilitate the Regional Board staff in assessing its potential effects. <br /> Based upon comments in the attached checklist,we request the County provide a signed Standard <br /> Observations form. We also require EPA Method 7199 (ion chromatography) for hexavalent chromium <br /> be used instead of EPA Method 7196 (colorimetric) for future monitoring. <br /> The attached Monitoring Report Compliance Checklist will be included in the case file for Corral <br /> Hollow Sanitary Landfill. <br /> If you have any questions or comments regarding my review,please call meat(916) 255-3137. <br /> KIM A. SCHWAB, RG <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon, San Joaquin County Environmental Health Department, Stockton 4 <br /> kas:Corral 3Q 2001 Itr <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />