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f <br /> Co� : '), ' <br /> f *W* <br /> °S:2b <br /> Y <br /> _ <br /> -4/0: 3,7 <br /> 4/0: ,7 <br /> EmconASSOCIATES D&PT or � 1� r .1 <br /> Conswtants in wastes,fp s <br /> Management and <br /> Env rcnmentai Control J <br /> December 4, 1991 <br /> Project 939-02.31 <br /> Mr. Tom Horton <br /> Solid Waste Manager <br /> Department of Public Works <br /> San Joaquin County <br /> 1810 East Hazelton Avenue <br /> Stockton, California 95201 <br /> Re: Proposed Water Quality Protection Standards (WQPS) for North <br /> County Landfill <br /> Dear Mr. Horton: <br /> This letter presents proposed WQPS for the North County Landfill, located <br /> in San Joaquin County, California. The plan was prepared by EMCON <br /> Associates (EMCON) on behalf of San Joaquin County pursuant to the <br /> requirements in waste discharge requirements (WDR) order no. 91-021 , <br /> issued on January 29, 1991 , by the California Regional Water Quality <br /> Control Board (RWQCB), Central Valley Region. The WDR requires that <br /> WQPS be established for ground and surface water at the landfill based <br /> on 1 year of monthly monitoring data from background monitoring well G-1 <br /> and upstream surface water points S-1 and S-2. <br /> The sections below discuss WQPS in relation to past and present regula- <br /> tory monitoring requirements, describe the WQPS monitoring program, <br /> and present the proposed WQPS. <br /> REGULATORY REQUIREMENTS <br /> The WDR for the North County Landfill were issued when monitoring <br /> requirements of repealed Article 5, Title 23, of the California Code of Reg- <br /> ulations were in effect. Under repealed Article 5, WQPS were defined as <br /> PJ9\939\9390231 i <br /> 1433 N. Market Boulevard. Sacramento. California 95834. (916)928-3300 <br />