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APPENDIX C 1 SOIL CALCULATIONS AND 1 NON-SOIL DAILY AND INTERMEDIATE COVER j AND UNIVERSAL SOIL LOSS EQUATION CALCULATIONS SOIL CALCULATIONS Excavation must be performed for Phases I through IV. The proposed new creek channel, the flood plain offsets, and the surface water detention pond must also be excavated. Several areas require fill. All six phases require soil for the daily and intermediate cover,the liner, the operation layer (to protect the liner), and the final cover. Furthermore, the existing landfill needs a final cover. The calculations for these areas are included as Attachment A. One other area that requires fill is the existing creek channel. The length of this channel is approximately 6,790 linear feet. The average cross-section is approximately 300 square feet. This channel will be approximately half filled. The resulting quantity of fill needed is approximately i 37,000 cubic yards. The above values were summarized in the text. This information is provided here as back-up material for additional review. 6 NON-SOIL DAILY AND INTERMEDIATE COVER In order to meet the regulatory requirements for daily cover, large quantities of suitable soils are required. Typical ratios of solid waste to soil range from 4:1 to 2:1 for the excavation of soils, depending on site characteristics and the techniques used by the landfill operator. If a typical ratio of 3:1 is used, then the soil required for daily cover for the total estimated capacity of the landfill of 18.1 million cubic yards would be approximately 4.5 million cubic yards. This large quantity of soil must be either excavated and stockpiled during construction of new phases, or must be extracted from borrow areas. In landfills with little excavation required or with limited access to suitable on-site soils,then large amounts of soil may have to be imported to the site to meet the daily cover requirements. In order to reduce the amount (and therefore expense) involved in moving these large quantities of soils,several alternative materials for daily cover have been proposed. These alternatives to daily cover (ADC) include: - Synthetic foam that is applied over the compacted active fill face at the end of each day. There are two types of synthetic foam, one type hardens after drying and the other type remains in a semi-liquid form. - Synthetic fabric made from polypropylene which is used to cover the active face at the end of each day. The fabric may be re-used for a period of three to four weeks.