Laserfiche WebLink
• Previously Disturbed Area <br />The previously disturbed areas 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 and and semiarid rangelands <br />Cover Type - Oak - aspen - mountain brush mixture <br />Hydrologic Condition Poor <br />Soil Type - Absarokee 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 area 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 are considered to be gravel surfaced. <br />Table 2- 2a- Runoff curve numbers for urban areas. <br />Cover Type - Paved <br />Soil Type - Absarokee C <br />Curve Number 92 <br />Cover Type - Gravel <br />Sn'-t Tvpr -- 9lxwrikrr C <br />Curve Number 89 <br />Cover Type - Dirt <br />Soil Type - Absarokee 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 mist. 7.7 Acres <br />Dirt <br />The remaining disturbed area z 77 Acres <br />Area that contributes run -off to ponds B & C 65.7 Acres <br />Weighted Average curve number for disturbed areas: <br />04/03 <br />Area <br />Curve # Extended <br />. <br />Paved <br />5.3 <br />92 7.4 <br />Gravel <br />7.7 <br />89 10.4 <br />Dirt <br />52.7 <br />87 69.8 <br />Total <br />65.7 <br />87.6 Weighted average curve # <br />• <br />Cuve number 87.6 will be <br />utilized for all of the disturbed areas. <br />A PPROW D <br />PR -07 <br />EXHA -3a <br />04/03 <br />