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acknowledges that some deterioration may have occurred since the passage of <br />• SMCRA. In the event that up-gradient modifications fail to stabilize the <br />gullies, p6M and CDM&G will promptly confer and agree upon appropriate <br />remedial measures. Such repair work will be formulated with due regard to (1) <br />the pre-SMCRA existence of the gullies, (2) the risk of damage to undisturbed <br />land in making repairs, and (3) the limitations of the ability of safely <br />operating equipment on the slope. <br />Due to the complexity of the drainage control plan for the Goat Trail, <br />the road was subdivided into 14 segments. The following provides a <br />description of each segment and the manner in which drainage will be <br />controlled. The road segments are shown on Exhibit 3.SF-1 while the <br />delineation of the subwatersheds contributing flow to the road are shown on <br />• <br />Exhibit 4.6-21. Modeling of the runoff from the road and associated areas was <br />performed using the SEDCAD+ computer model. The curve numbers used are values <br />previously used and approved during the initial modeling efforts for designing <br />the road culverts and tipple pond capacities. Results of the modeling effort <br />and drainage control structures are provided at the end of this appendix.~A <br />key cross-referencing the subwatershed nomenclature used on Exhibit 4.6-21 and <br />the SEDCAD+ nomenclature is also provided in this appendix. <br />Segment 1 (lA to 1B): <br />Drainage Areas - Disturbed Area 2A - includes a portion of the small <br />area exemption south of shop <br />containing the oil dock (the oil <br />dock area itself has berms to <br />provide spill containment) <br />Disturbed Area 6 - includes road drainage above the <br />Goat Trail on the east side of <br />the shop. <br />Drainage Control - Road is crowned with berm on outslope side of road to <br />carry all drainage except drainage from center of road <br />to inslope side. A water cross-over will be placed <br />approximately midway down Segment 1 to enable the <br />inslope drainage to drain to the outslope berm. Water <br />3.SF-3 May 14, 1993 <br />