Laserfiche WebLink
California Regional Water Quality Control Board <br /> Central Valley Region M. <br /> Steven T.Butler,Chair <br /> Winston H.Hickox Gray Davis <br /> Secretaryfor Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swreb.ca.gov/—rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> J"'25 August 2000 <br /> Mr. Wes Johnson <br /> County of San Joaquin <br /> Department of Public Works <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OFMONITORINGREPORT,NORTH COUNTYSANITARYLANDFILL, SAN <br /> JOA QUINCOUNTY(CA SENO.3161) <br /> Regional Board staff has reviewed the North County Sanitary Landfill, Second Quarter 2000, <br /> Groundwater and Surface Water Monitoring Report, dated 15 July 2000. <br /> The county conducted a retest for several VOCs in well G-1, the upgradient well. The Regional Board <br /> received the results of the retest on 1 August 2000. The results did not confirm the presence of the <br /> previously detected VOCs. MTBE was also reported in downgradient well G-3. The retest was not <br /> conclusive for this well because the analytical reporting limit was higher than the previously detected <br /> concentration of MTBE. Another retest for MTBE in well G-3 should be performed with care taken to <br /> ensure that the analysis is run with U.S. EPA method 8260B and that the reporting limit is 0.5 µg/l. <br /> Additionally, the Annual report for 1999 indicated the presence of hexavalent chromium in both <br /> downgradient wells, G-3D and G-4. The staff letter of 25 May 2000 requested the county to conduct a <br /> retest for hexavalent chromium. Your letter of 22 June 2000 indicated that the county did not conduct <br /> the retest because the trace amounts detected at North County are the same as concentrations reported for <br /> Harney Lane and Foothill Sanitary Landfills. According to Title 27, an evaluation of the hexavalent <br /> chromium detections is required. Regional Board staff will address this issue in a separate letter. <br /> I have attached a copy of the Monitoring Report Compliance Checklist that will be included in the case <br /> file for North County Sanitary Landfill. Please note the comments included at the end of the checklist. <br /> Your responses to the comments in this letter and in the checklist should be submitted to staff of the <br /> Regional Board by 15 October 2000. <br /> If you have any questions or comments regarding my review,please call me at (916) 255-3137. <br /> WEND ARANO <br /> Associate Engineering Geologist <br /> cc.: Robert McClellon, REHS, Public Health Services, Environmental Health Division <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />