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"Wit . <br />eoogic Associates <br />AR, Geologists, Hydrogeologists and Engineers <br />July 13, 2005 <br />Job No. 2005-082 <br />Allied Waste Industries, Inc. <br />901 Bailey Road <br />Pittsburg, California 94565 <br />Attention: Mr. Locklin Caffey <br />ALTERNATIVE FINAL COVER DESIGN REPORT <br />FORWARD SANITARY LANDFILL, SAN JOAQUIN COUNTY, CALIFORNIA <br />1.0 INTRODUCTION <br />This report is presented as an -evaluation of the performance of an alternative final cover <br />system proposed for the closure of the North and Northwest slopes of the Forward <br />Sanitary Landfill in San Joaquin County, California. The analyses presented herein are <br />submitted as a basis for agency approval of this final cover system. The analyses have <br />been completed using local climatological data, soil data specific to the existing final <br />cover soils and the potential on-site borrow source and vegetative conditions typical of <br />the natural environment adjacent to the landfill. <br />qP California Code of Regulations (CCR) Title 27 § 21090 (a) require that landfill final <br />covers be constructed according to identified minimum standards. For unlined Class III <br />landfills similar to the Forward Sanitary Landfill (FSL), the minimum regulatory <br />requirements include a two -foot thick foundation layer, a one -foot thick low -hydraulic <br />conductivity layer, and a one -foot thick vegetative layer. As prescribed, the low - <br />hydraulic conductivity layer is to consist of soils with a saturated hydraulic conductivity <br />of less than 1 x 10-6 cm/sec. <br />C <br />CCR Title 27, Section 21090 (a) allows for alternatives to this prescriptive <br />standard in stating: <br />"The Regional Water Quality Control Board (RWQCB) can allow any alternative <br />final cover design that it finds will continue to isolate the waste in the Unit from <br />precipitation and irrigation waters at least as well as would a final cover built in <br />accordance with applicable prescriptive standards under �(a)(1-3)." <br />In addition, under the CCR Title 27 § 20080 (c)(1) the StateWater Resources Control <br />Board (SWRCB) requires the discharger to demonstrate that the prescriptive is not <br />feasible because it: <br />1360 Valley Vista Dr., Suite 100, Diamond Bar, CA 91765 Phone: (909) 860-3448 FAX: (909) 860-2024 <br />