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1A THOMAS R.FI.INN P.O.BOX 1810.1810 E.HAZELTON AVENUE DIRECTOR STOCKTON,CALIFORNIA 98201 1 . Y (209)468-3000 FAX(209)468-2999 i www.sigov.org THOMAS M.GAU DEPUTY DIRECTOR --�`° MANUEL SOLORK) DEPUTY DIRECTOR STEVEN VVINKLER DEPUTY DIRECTOR ROGER JANES January 31, 2006 BUSINESS ADMINISTRATOR Mr. Todd Del Frate California Regional Water Quality Control Board Central Valley Region 11020 Sun Center Drive, #200 Rancho Cordova, California 95670 SUBJECT: SECOND SEMESTER AND ANNUAL 2005 GROUNDWATER AND SURFACE WATER MONITORING REPORT; NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL Dear Mr. Del Frate: Enclosed is the Second Semester and Annual 2005 Groundwater and Surface Water Monitoring Report for the North County Recycling Center and Sanitary Landfill (North County RCSL), presenting data from the third and fourth quarters of 2005. A trace of Acetone was reported in wells G-3D, G-5, G-6 and a trace of Methylene Chloride was reported in Well G-3D in the third quarter. Neither Acetone nor Methylene Chloride were found in well G-3D or G-6 in the fourth quarter. Acetone and Methylene Chloride are common laboratory contaminants. Other than these five traces and "false positives", no VOCs were reported this semester. These wells were not retested because of the "trace" levels reported, in accordance with Title 27. We believe that inconsistent, sporadic detections such as these indicate contamination by laboratory or other means, and do not indicate actual groundwater contamination. However, we will continue to look closely at these compounds in the future. Note that a landfill gas extraction system is planned for construction this Spring. We expect that operation of this system will prevent future contamination of groundwater with the VOCs iassociated with landfill gas. / The only inorganic analyses to show a concentration exceedence occurred at up-gradient well G-1 (Electrical Conductivity). Exceedence of inorganic parameters at an up-gradient well, which is not under influence of the landfill, indicates variations in groundwater due to other(presumably natural) causes. We have observed this phenomenon at our other sites as well. As stated in the Amended Report of Waste Discharge, (May 27, 2005), we will continue to sample and analyze for VOCs at G-4, G-5, and G-6 quarterly, in addition to our regular semi-annual monitoring, and include the quarterly data in the semi-annual reports.