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e <br /> • PCU'N <br /> a Z� THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> STOCKTON,CALIFORNIA 95201-3018 <br /> DIRECTOR (209)468-3000 FAX(209)468-2999 <br /> oquFo ftN c www.co.san-joaquin.ca.us <br /> THOMAS M.GAU <br /> DEPUTY DIRECTOR <br /> MANUEL SOLORIO Working for YOU <br /> DEPUTY DIRECTOR ` IJ 16 <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> ROGER JANES '� h� �� , <br /> BUSINESS ADMINISTRATOR May 3,2006 <br /> Mr.Robert McClellon <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Avenue,Third Floor <br /> Stockton,California 95202-2708 <br /> SUBJECT: EROSION REPAIR OF CLOSURE CAP AT THE HARNEY LANE SANITARY <br /> LANDFILL <br /> Dear Mr.McClellon: <br /> Enclosed,please find the"Work Plan for the Repair of the Clay Barrier Layer"at the Harney Lane <br /> Landfill,under which the closure cap eroded in January 2006 will be restored. This Plan is submitted per <br /> your letter of April 26,2006. <br /> This Plan shows repair of the barrier layer using Geocomposite Clay Liner(GCL)that was approved for <br /> the of North County Recycling Center and Sanitary Landfill Module 4 base liner. The GCL was accepted <br /> as an engineered alternative to the one-foot thick base liner clay barrier(maximum permeability <br /> 10-7 cm/sec)as required by California Code of Regulations Title 27. Base liners are required to be ten <br /> times less permeable than closure cap barrier layers(maximum permeability of 10-6 cm/sec). In addition, <br /> the GCL will not crack due to desiccation nor erode as does natural clay. Therefore,we feel that the GCL <br /> is a superior method to restore the barrier layer of a closure cap. <br /> If you have any questions,please contact me at(209)468-8504. <br /> Sincerely, <br /> W.MICHAEL CARROLL,PE <br /> Senior Civil Engineer <br /> WMC:Ij <br /> N:\1 Harney Lane\RMcClellon01-S_EdgeErosionlj.doc <br /> Enclosure <br /> c: Mr.Todd Del Frate,RWQCB <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova,California 95820-6114 <br /> LA 11870 <br />