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SEC710N 1 -LANDFILL EXPANSION ISSUES Page 1-18 ■ Final cover for existing landfill ■ Excavation for Phases I - IV ■ Excavation for creek realignment, floodplain areas, and surface water detention pond ■ Daily and intermediate cover for existing and proposed expansion (assumed to be a 3:1 ratio of refuse to cover for determining excavation quantities) Table 1-5 summarizes the site excavation and fill quantity estimates. The overall mass balance shows that approximately 5.2 millon cubic yards of soil material would need to be excavated from the borrow area located north of the existing landfill. This would require an excavation depth of approximately 35 feet. As can be seen in this table, daily and intermediate cover requirements are approximately 4.9 million cubic yards; if an alternative daily cover material is used, the required borrow area excavation could be significantly reduced. Table 1.5 EXCAVATION AND FILL REQUIREMENTS Excavation F111 Element (C1n (C`1) Phase Excavation (I - IV) 1,880,000 Creek Channel - New Alignment 47,000 Flood Plain 70,000 Landfill Surface Water Detention Pond 33,000 Creek Channel - Existing Alignment 37,000 Liner Soil, Phases I - VI (2 feet) 593,000 Operation Layer, Phases I -V1 (1.5 feet) 445,000 Existing Landfill Final Cover (3 feet total over intermediate cover) 516,000 Final Cover, Phases I - VI (2.5 feet total over Intermediate cover) 741,000 Daily/Intermediate Soil - Existing Landfill 4,513,000 DallyAntermediate Soil - Proposed Expansion 400,000 L Total Excavation and Fill 2,030,000 7,245,000 [ Net Fill Required 5,215,000 15.6 On-Site Stockpiling Soils suitable for intermediate cover, liner construction, and final cover which are excavated during phase construction or operation will be stockpiled on-site until needed. Stockpiles will be City of Scoekmn R W.Beek and ASSOCJataS 1811.002