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N� <br /> California egio ater Quality Control oar <br /> Central Valley Region <br /> J <br /> Steven T.Butler,Chair <br /> Winston H.Nickox Gray Davis <br /> Serretan,for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br /> Protection Error: 3443 Routier Road,Suitc A,Sacramento,Califomia 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 1 February 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 2001 MONITORING REPORT,FOOTHILL SANITARY <br /> LANDFILL, SAN JOA QUIN COUNTY(CASE NO. 1928) <br /> We have reviewed the Foothill Sanitary Landfill, Third Quarter 2001, Groundwater and Surface Water <br /> Monitoring Report, dated 15 October 2001. <br /> MW-3 detected 1,4-Dichlorobenzene at 0.18 µg/1,tetrachloroethene at 0.086 µg/1, and trichlorethene at <br /> 0.065 µg/1 during the 3rd quarter monitoring event. An Evaluation Monitoring Program was submitted <br /> May 2001. The monitoring report indicates an upward trend for sulfate in monitoring wells MW-2 and <br /> MW-3. We expect the Annual Monitoring and Reporting Program will provide an evaluation of these <br /> trends. <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 Foothill <br /> Sanitary Landfill. <br /> If you have any questions or comments,please call me at(916) 255-3137. <br /> KIM A. SCHWAB, RG <br /> Associate Engineering Geologist <br /> cc+encl: Robert McClellon, San Joaquin County Environmental Health Department, Stockton <br /> kas:Foothill 3Q 2001 ltr <br /> California Environmental Protection Agency <br /> ��Recycled Paper <br />