ARCHIVED REPORTS_2008_29 - Laserfiche WebLink

Home Browse Search

permitted airspace as of December 31, 2007 is approximately 26.3 mcy. The proposed expansion area will add approximately 39.5 mcy of airspace. The remaining site life is based on an overall Airspace Utilization Ratio (AUR) of 1,830 pounds of waste disposed per cubic yard of airspace consumed. In order to calculate the site life for the FL, the following criteria was utilized: • Remaining Site Capacity as of 12/31/07 (with liner and final cover subtracted) 26.3 mcy • Expansion Area Capacity 39.5 mcy • Airspace Utilization Ratio 1,830 lbs/cy Based on the above criteria and utilizing the current refuse inflow rates (1,981,680 in 2008) with a 2 percent annual growth rate until the tonnage cap is reached in approximately 2021, the FL will have a projected site life of approximately 24 years (as of December 31, 2007). Based on these calculations, operations at the FL could extend to 2032. 5.2.4 CONSTRUCTION SEQUENCING The lateral expansion area will be developed in consecutive phases over the site's life. The conceptual engineering design proposes five excavation phases and five corresponding fill phases, and is shown on Figure 7. The development sequence is based on the proposed base grading plan (Figure E), final grading plan (Figure F), and established design criteria. Each excavation/fill phase may be divided into smaller construction stages depending on site conditions, and refuse/beneficial materials inflow rates at the time of development of a given construction stage. The landfill phases were designed and will be implemented in an environmentally sound manner that will provide the most efficient operation and use of the facility. The smaller construction stages will limit the amount of earth and refuse area exposed to the environment, which will aid in the reduction of erosion, dust and odor generation. Excavation activities will occur, as much as possible, as part of daily site operations (i.e., daily cover). The phased waste placement necessitates that the operator maintain minimum deck and sideslope gradients and construct temporary access roads. The stormwater drainage control facilities and the infrastructure for the ultimate configuration will be progressively constructed as waste filling is completed. Forward Landfill Project Description 5-4 BRYAN A.STIRRAT&ASSOCIATES (J:\Allied\Forward\2007.0018 Lateral Expansion\Reports\Prof Descrip\021308 Final Proj Des\Sec 5.doc:2/14/2008)