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Fox River Paper Company January 31,2007 <br /> Combined Annual and 4th-Quarter 2006 Groundwater-Monitoring Report Page 5 o/'9 <br /> Clarifier effluent is discharged into two aeration basins, in sequence (ASB-1 and ASB-2). <br /> • The first pond, ASB-1, is approximately 14 feet deep and is lined; the second, ASB-2, is <br /> unlined and approximately 5 feet deep. Effluent from ASB-2 is pumped to irrigation and <br /> percolation fields around the site. The average TDS concentration of effluent exiting ASB-2 <br /> for 2006 was 788 mg/L. <br /> Other ponds on the site (labeled Ponds 1 through 4) are unlined and used only to contain <br /> excess waste water in case of a system upset or a 100-year-or-greater storm event. <br /> Inert dewatered sludge from the clarifier and aeration basins is discharged to a lined sludge <br /> disposal area with a leachate-collection system. Leachate from the sludge pond is pumped <br /> back into the clarifier. The site also contains an inactive "closed" sludge disposal unit. <br /> Analytical data of sludge samples collected on October 26 and November 10, 2006, are <br /> presented in Table 3. Detected levels of chromium, copper, and zinc are below published <br /> average background concentrations for California soils'. <br /> Table 3 <br /> Sludge Sample Analytical Results <br /> October 26 and November 10 2006 <br /> Analyte Test Method Results <br /> m K <br /> Cadmium EPA-6010C <0.1 <br /> • Chromium EPA-6010C 0.6 <br /> Copper I EPA-6010C 2.5 <br /> Lead EPA-6010C <0.4 <br /> Nickel EPA-6010C <0.5 <br /> Zinc EPA-6020 9.0 <br /> ULU <br /> Acetone I EPA-8260B <5.0 <br /> 2-Butanone I EPA-8260B <5.0 <br /> A copy of J. L. Analytical Services, Inc.'s data sheet for the sludge sample is presented in <br /> Attachment A. <br /> City of Ripon <br /> The City of Ripon operates a municipal waste-water treatment facility (MWWTF) adjacent to <br /> the southwest quadrant of the FR site. The MWWTF treats an average of 1,000,000 gallons of <br /> domestic effluent a day. The system consists of a series of clay-lined ponds with surface <br /> mechanical aeration system to oxygenate the waste water. Treated effluent water is disposed <br /> • 'Kearney Foundation of Soil Science,March 1996,Background Concentrations of Trace and Major Elements in <br /> California Soils. <br /> 005194.00, Task 8 Lawrence&Associates <br /> W.•I ClientsI FoxRiverI QuarterlyMomtoring1200614Q100614th 2006report doc <br />