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• construction and demolition waste, TASW, ash and cement,kiJn dust, shredded <br /> tires, synthetic tarps, compost materials (off spec-delivered by generator), and <br /> PGM. Predominately, Forward utilizes soil and the following ADC materials, <br /> PGM, TASW, synthetic tarps and shredded tires. Forward utilizes a refuse-to- <br /> cover ratio of 4:1 for purposes of calculating the landfill's remaining capacity and <br /> site life. In addition, the remaining waste capacity and site life are reviewed <br /> annually by Forward and are required to be updated in accordance with <br /> 27 CCR, Section 21640, in conjunction with a review of the solid waste facilities <br /> permit every five years. <br /> 4.6 SITE CAPACITY <br /> As previously discussed, the disposal area footprint consists of approximately <br /> 354.5 acres. The total site capacity is based on the difference between the <br /> estimated subgrade excavation and the final disposal area contours. The total <br /> remaining airspace for the Forward Landfill, as of December 31, 2006, is 28.2 <br /> million cubic yards (mcy) (date of last aerial survey was February 2006). <br /> Appendix C presents information regarding air space, final, intermediate and <br /> • daily cover requiremets and remaining refuse capacity. The remaining site life <br /> is based on a refuse to soil volume ratio oNnts <br /> a refuse density of 1,740 <br /> pounds per cubic yard. Forward's consulthe two aerial <br /> topographic maps to estimate the volumefuse and cover soil) placed <br /> during the periog-between the two aerials. The site capacity calculations <br /> reflecting this formation are include'in Appendix C. <br /> 4.7 SITE LIFE PROJECTION <br /> 4.7.1 SITE LIFE CALCULATIONS <br /> In orde to calculate the site life for the Forward Landfill, the following criteria <br /> was `''ized. <br /> • maining Site Capacity as of 12/31/06 (with liner, daily, <br /> ntermediate and final cover) 28.2 mcy <br /> Refuse to Cover Ratio 4:1 <br /> In-Place Density 1,740 lbs/cy <br /> • <br /> Forward Landfill JTD 4-11 <br /> J:\Allied\Forward\JTD Amendment\January 2007 JTD Amendment\JTD Sec 4 Final.doc: <br /> 05/24/02;Amendment No. 1: 2/1/2007 BRYAN A.STIRRAT&ASSOCIATES <br />