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• Previously Disturbed Area <br />The previously disturbed aeeas are the light use roads above the <br />site. These roads have been invaded with oak brush and other <br />understory. The cover condition of the cover would be considered <br />poor < 30%. ' <br />Table 2-2d-Runoff curve numbers for arid and semiarid rangelands <br />Cover Type -Oak-aspen-mountain brush mixture <br />Hydrologic Condition Poor <br />Soil Type -Absazokee C <br />Curve Number 74 <br />The previously disturber area also includes a small amount of the <br />meadow community which was also assigned a curve number of 74. <br />Disturbed Area <br />The disturbed azea is made up of basically three cover types. <br />They are; 1) paving; 2) coal pad and facilities and; 3) dirt slopes. <br />The coal pad and facilities aze considered [o be gravel surfaced. <br />Table 2-2a-Runoff curve numbers for urban aeeas. <br />Cover Type -Paved <br />Soil Type -Absazokee C <br />Curve Number 92 <br />Cover Type -Grave] <br />Soil Type -Absazokee C <br />Ctitrve Number 89 <br />Cover Type -Dirt <br />Soil Type -Absazokee C <br />Curve Number 87 <br />Paved Area <br />9600 feet of road @ 24' Wide 5.3 Acres <br />Gravel <br />5.7 acre coal yard + 2 acres misc. 7.7 Acres <br />Dirt <br />The remaining disturbed area 52.7 Acres <br />Area that contributes run-off to ponds B & C 65.7 Acres <br />Weighted Average curve number for disturbed aeeas: <br /> Area Curve # Extended <br />. Paved 5.3 92 7.4 <br /> Gravel 7.7 89 10.4 <br /> Dut 52.7 87 69.8 <br /> Total 65.7 87.6 Weighted average curve # <br />• Cuve number 87.6 will be utilized for all of the disturbed areas. <br /> APPRo~D <br />PR-0~ .S/I'i/~3 EXli-a-3a <br />04/03 <br />