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evaluation method determines the potential for soil erosion based on the rainfall and runoff factor, the soil erodibility factor, the topographic factor derived from the slope gradient and length, the cover and management factor, and the support practice factor. The evaluation indicates that the average soil loss will be approximately 1.0 ton per acre per year for each area evaluated which is below the two tons per acre per year allowed by the CIWMB. The vegetative layer of the final soil cover will be seeded with native grasses to protect the upper layer of soil, and to minimize erosion. 5.2.6.2 REALIGNMENT OF LITTLE JOHNS CREEK The North Branch of the South Fork of Little Johns Creek is currently located to the south of the existing Austin Road Landfill footprint (see Drawing 2). For the future Forward Landfill, this creek will be realigned to the north and west of the existing Austin Road Landfill footprint. This proposed realignment increases the overall length of the creek by three percent, with a proportionate change in slope, or grade, of the channel. The creek will exit the landfill site at essentially the same location at which it now exits. The new realigned creek will provide the same protection compared to the original route and will provide the following: • Eliminate flood plain areas from the horizontal landfill expansion areas. • Provide surface water run-on control for the horizontal expansion phases by eliminating the primary potential run-on source. • Allow maximum capacity development of the site by allowing refuse filling between the horizontal and vertical expansion phases of the Austin Road Landfill. 5.2.7 LANDFILL GAS MANAGEMENT An active landfill gas extraction system (LFGES) is installed on a portion of the existing Austin Road Landfill (see Drawing 12). This system is utilized by Ogden Power Pacific, Inc. to operate an electrical generation plant located at the northwest corner of the site. The power plant utilizes enough landfill gas to produce up to 760 kilowatts per hour of electrical power. This energy is sold to PG&E under a long-term agreement. The existing LFGES at the Austin Road Landfill is comprised of approximately 30 vertical extraction wells, which actively collect gas from the waste prism, and headers and lateral piping to convey forward Landfill JTD 5-11 L:\Allied\2000.793\Reports\JTD-PC PCMP702:Sec-5.0:5/24/02 Revision 1:07/16/02 BRYAN A.STIRRAT&ASSOCIATES