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III. Environmental Setting, Impacts,and Mitigations <br /> J. Geology, Soils and Seismicity <br /> TABLE III.J.3: PROJECT SOIL BALANCE <br /> Excavation Fill <br /> Project Element (cubic yards) �cubicwards) <br /> Cell Excavation,Phases I-IV 1,880,000 <br /> Creek Channel Realignment 47,000 <br /> Floodplain Storage 70,000 <br /> Detention Pond 33,000 <br /> Abandoned Creek Channel 37,000 <br /> Liner Soil,Phases I-VI 593,000 <br /> Operation Layer,Phases I-VI 445,000 <br /> Final Cover,Existing Landfill 516,000 <br /> Final Cover,Phases I-VI 741,000 <br /> Daily/Intermediate Cover,Existing Landfill 400,000 <br /> Daily/Intermediate Cover,Phases I-VI 4,913,000 <br /> TOTALS <br /> Total Excavation and Fill required 2,030,000 7,245,000 <br /> Net Fill Requirement 5,215,000 <br /> Proposed On-Site Borrow 5,215,000 <br /> Assumed Net Off-Site Import/Export 0 <br /> * Approximately 5.2 million cubic yards of soil material need to be excavated from the borrow <br /> area north of the existing landfill. This would require an excavation depth of approximately <br /> 35 feet below the existing surface,on about 95 acres of the parcel assuming all excavated <br /> materials can be used for daily,intermediate,or final cover. <br /> The soil mass balance calculation included the following elements: <br /> • Liner soil,operation layer,final cover for Phases I to VI <br /> • Final cover for existing landfill <br /> • Excavation for Phases I to VI <br /> • Excavation from creek realignment,floodplain areas,and surface water detention pond <br /> • Daily and intermediate cover for existing landfill and proposed expansion <br /> SOURCE: R.W. Beck and Associates,Preliminary Draft of the Final Design Study Report for <br /> the Austin Road Landfill Expansion,November 1992. <br /> III.J.12 <br />