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U I N <br /> m g < THOMAS R. FLINN P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> DIRECTOR STOCKTON,CALIFORNIA 95201 <br /> (209)468-3000 FAX(209)468-2999 <br /> ��aoad <br /> www.co.san-joaquin.ca.us <br /> THOMAS M.GAU +� <br /> DEPUTY DIRECTOR ' <br /> MANUEL SOLORIO ��� J <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER MAY 0 22003 <br /> DEPUTY DIRECTOR <br /> BENTON ANGOVE May 2,2003 ENVII 14 <br /> BUSINESS ADMINISTRATOR PE �1111riSE \DICES <br /> Ms. Kim Schwab <br /> California Regional Water Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827 <br /> SUBJECT: USE OF CRUSHED ROCK FOR DRAINAGE LAYER, FOOTHILL AND <br /> NORTH COUNTY LANDFILL LINER INSTALLATION <br /> Dear Ms. Schwab: <br /> Attached is a proposed alternate design for the LCRS drainage layer for both the Foothill and <br /> North County landfill liner installations. This alternate would allow the use of crushed rock with <br /> protective geotextile cushion in lieu of the subrounded gravel presently specified(Technical <br /> Specifications Section 02200). <br /> This alternate is proposed because of the potential cost saving to the County by allowing the <br /> contractor to manufacture the LCRS drainage layer from on-site material,rather than importing it <br /> from off-site sources. <br /> I have attached the major specification section revisions and related construction details that <br /> would incorporate this alternate into the contract. I have also attached an analysis by <br /> Emcon/OWT demonstrating the puncture protection and interface stability of this alternate. <br /> Please let us know if this alternate is acceptable. If we hear from you on this matter by <br /> May 21,2003 we will be able to present this as an available option to the contractor on or about <br /> May 28, 2003. <br /> If you have any questions,please call me at (209) 468-3066. <br /> Sincerely, <br /> Q * ; MiLi ca'JI <br /> W. CARROLL,PE <br /> Senior Civil Engineer <br /> Attachments <br /> MC:NZ:sc <br /> N:\TwoModules\RWQCB\CrushedRock\KSshwabI 8-CrushedRock.wpd <br /> c: Robert McClellon,Environmental Health Department <br /> LA 63107 <br />