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ADDENDUM TO <br />FINAL ENVIRONMENTAL IMPACT REPORT <br />for The <br />NORTH COUNTY SANITARY LANDFILL <br />October 25,1990 <br />This addendum is issued to the Final Environmental Impact Report <br />for the North County Sanitary Landfill to describe two changes. <br />1) The landfill area shown on Figure 2-4 of the FEIR has been <br />reduced from 211.7 acres to 185.4 acres. Figure 2-4 has also <br />been revised. See attached revised copy. <br />2) The planned Leachate Collection and Removal System (LCRS) is <br />further described as follows: <br />1. A composite liner design which consists of a minimum 6 <br />inch thick scarified and recompacted soil layer overlain <br />by a 60 mil. HDPE liner. <br />2. The recompacted soil layer and HDPE liner would be <br />constructed under an approved CQA program. <br />3. The soil layer overlain by the HDPE would be specified <br />for recompaction to a permeability equal to or less than <br />.0001 cm/sec. <br />4. Approval for the use of a composite liner is contingent <br />upon the approval by the Regional Water Quality Control <br />Board of a quality assurance/ quality control (QA/QC) <br />plan for construction of a soil layer prior to <br />construction. <br />5. A dendritive network composed of 6 -inch diameter <br />perforated pipes installed in granular drainage material. <br />6. A 10 -ounce per square yard geotextile surrounding the <br />granular drainage material. <br />7. A 1 -foot -thick soil operations layer over the liner and <br />dendritive network. <br />8. Collected leachate will be disposed of off-site at a <br />Regional Wastewater Treatment plant. <br />The use of a composite liner (HDPE) is contingent upon receiving <br />all necessary approvals prior to commencing construction. <br />otherwise, a clay liner as described in the RDSI will be <br />constructed. <br />