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PCkU IN • <br /> f CO <br /> THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR duh STOCKTON,CALIFORNIA 95201 <br /> (209)468-3000 FAX(209)468-2999 <br /> www.sjgov.org/pubworks <br /> CiFap <br /> THOMAS M.GAU <br /> CHIEF DEPUTY DIRECTOR <br /> MANUEL SOLORIO Worldmg <br /> for YOU <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER <br /> DEPUTY DIRECTOR <br /> o ,r �lU <br /> ROGER JANES <br /> BUSINESS ADMINISTRATOR May 29, 2007 <br /> Mr. Todd Del Frate <br /> 1 2007 <br /> California Regional Water Quality Control Board ENV!RUP.'!'v"ENT HEALTH <br /> Central Valley Region PERIA!T/Si RVICES <br /> 11020 Sun Center Drive, #200 <br /> Rancho Cordova, California 95670-6114 <br /> SUBJECT: REVISED COST ESTIMATES FOR CORRECTIVE ACTION AT THE <br /> CORRAL HOLLOW AND HARNEY LANE SANITARY LANDFILLS <br /> Dear Mr. Del Frate: )Q, <br /> 0 <br /> Enclosed please find revised cost estimate for corrective action at the Corral Hollow and Harney <br /> Lane Sanitary landfills (prepared in association with Shaw Environmental and Infrastructure, Inc), <br /> revised per your letter of January 9, 2007. At both landfills our assessment is that the likely <br /> foreseeable scenario requiring corrective action is impact to groundwater by landfill gas. <br /> Therefore, the proposed remediation scenarios, for the purpose of financial assurance, are <br /> implementation of additional landfill gas control. The revisions include the cost for delineating a <br /> contaminant plume and the infrastructure to support additional landfill gas wells. <br /> Please review the enclosed estimates, and if you find them reasonable, we would greatly <br /> appreciate a letter stating this for our transmittal to the California Integrated Waste Management <br /> Board (CIWMB). In the past, CIWMB staff has required a letter from Regional Water Quality <br /> Control Board staff stating whether estimated costs appear reasonable. Concurrence with the <br /> magnitude of the estimate will also allow us to evaluate our options for financial assurance. <br /> Please contact me at (209)468-8504 with any questions. <br /> Sincerely, <br /> W. MICHAEL CARROLL, PE <br /> Senior Civil Engineer <br /> WMC:kb <br /> N:\Miscellaneous\ClosCostEstTinAssu r&Costs\TDelFrate02-RevCorrActCostEst.doc <br /> Enclosures <br /> c: Robert McClellon, Environmental Health Department <br /> LA 1103C, LA 21125 <br />