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L1 <br /> a <br /> Pquiro <br /> P.O.BOX 1810-1810 E.HAZELTON AVENUE <br /> :< THOMAS R. FLINN STOCKTON,CALIFORNIA 95201 <br /> DIRECTOR � � (209)468-3000 FAX(209)468-2999 <br /> www.co.san-Joaquin.ca.us <br /> RpR <br /> r�+9 <br /> THOMAS M.GAU '� (� (�•. <br /> DEPUTY DIRECTOR ` ` rl <br /> i <br /> {I i ! <br /> MANUEL SOLORIO W� for YOU inl��� <br /> 17 <br /> DEPUTY DIRECTOR <br /> STEVEN WINKLER MAY 0 2003 <br /> 2 IV <br /> DEPUTY DIRECTOR <br /> BENTON ANGOVE May 2,2003 ENVI(�pQfq�(`Y"tIN HEALTH <br /> BUSINESS ADMINISTRATOR PERMITf SERVICES <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 /> SincerelyLCARROLL, <br /> ; q C II <br /> W. PE <br /> Senior Civil Engineer <br /> Attachments <br /> MC:NZ:sc <br /> N:\TwoModules\RW QCB\CrushedRock\KSshwab 18-CrushedRock.wpd <br /> c: Robert McClellon, Environmental Health Department <br /> LA 63107 <br />