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eoLogic Associates <br /> !-cGeologists,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 /> 1.1 REGULATORY REQUIREMENTS <br /> 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 /> 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 />