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PquiN <br /> g THOMAS R. FLINN � P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR a P STOCKTON,CALIFORNIA 95201 <br /> •64,. .;.a�P• a (209)468-3000 <br /> FAX(209)468-2999 , <br /> �FOR www.co.San-joaquin.ca.US <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> MANTEL SOLORIDIRECTOR II EVED <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> BENTON ANGOVE <br /> BUSINESS ADMINISTRATOR <br /> VIRCRMENT HEALTH <br /> April 4, 2003 PERMIT/SERVICES <br /> Ms. Kim Schwab <br /> California Regional Water Quality Control Board <br /> Central Valley Reg'on <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br /> SUBJECT: LEACHATE RETURN TO REFUSE;NORTH COUNTY LANDFILL <br /> Dear Ms. Schwab: Vivo <br /> I <br /> As you suggested, County staff has calculated the increased leachate burden on the <br /> Leachate Collection and Removal System of Module 3 due to the percolation of leachate <br /> from Modules 1, 2, and 3 through the refuse at a single return point. The calculations indicate <br /> that the contribution of returning leachate is insignificant compared to the capacity of the <br /> Leachate Collection and Removal System(return adds approximately 3 percent of system <br /> capacity). This calculation is based on peak leachate collection rates over the last three years, <br /> and as much as 10 percent of the returned leachate percolating to the Leachate Collection and <br /> Removal System. <br /> It therefore appears that return of leachate to the refuse by percolation will not compromise the <br /> existing Leachate Collection and Removal System, even under worst-case conditions. We <br /> therefore respectfully ask that Board staff consider lifting the prohibition against the use of the , <br /> leachate return point"(see attached figure). We believe that this configuration allows return of <br /> leachate to the refuse with maximum percolation area and maximum containment within the <br /> Solid Waste Management Unit. <br /> Note that we intend to relocate the leachate return periodically. We anticipate that the refuse in <br /> the percolation area will become saturated, limiting the quantity of leachate that can be <br /> percolated at that point. We will install a replacement infection point over newer, dry refuse at <br /> that time. <br /> If you have any questions,please call me at(209)468-3066. <br /> Sincerely, <br /> W. MICHAEL CARROLL,PE <br /> Senior Civil Engineer <br /> Attachment <br /> MC:NZ:kf <br /> NATwoModules\RWQCB\KSshwab 17-IeachateRetum.wpd <br /> c: Robert McCiellon,Environmental Health Department <br /> LA 63107 <br />