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Section 780.21(c) Continued. <br />with the one shown in figure 6, Kerr Baseline ground Water puality. <br />demonstrates that there has been no change to date in ground water <br />quality adjacent to existing operations. However, data from the on- <br />going hydrologic monitoring program will be used to quantify and <br />model the movement, dilution and discharge of increased dissolved <br />solids in the ground water system resulting from mining, if possible. <br />Surface Water Effects <br />Runoff and Erosion <br />The surface coal mining operations proposed by Kerr Coal involve the <br />striping, storage and subsequent replacement of topsoil and <br />vegetative cover. Disturbed areas which have had topsoil temporarily <br />removed during operations will be susceptible to runoff and erosion. <br />However, according to the reclamation plan in Section 780.18, <br />reclamation and related reseeding promptly following mining will <br />result in relatively small areas being stripped of topsoil at any one <br />time. Topsoil will be removed and stored only as far ahead of mining <br />as necessary to facilitate operations, and replaced, landscaped, and <br />reseeded as soon as practical after backfilling and grading. For the <br />short period of time that bare ground will be exposed without <br />stabilized soil, runoff and erosion rates within the disturbed areas <br />will be higher than those of undisturbed areas. <br />In active and inactive pit areas, surface runoff from pit walls, <br />benches, ramps, and haul roads and minor ground water inflows will <br />typically be retained within the pit. Retention of runoff and ground <br />water inflows in pit areas may result in accumulations of pit water <br />which will be discharged during final reclamation. <br />As described in Section 816.42, all runoff from mine plan and tipple <br />areas and any pit water discharge will be passed through sediment and <br />drainage control facilities and sedimentation ponds before being <br />released to streams. Flow controls such as diversion ditches and <br />sedimentation ponds will be sued to slow the surface runoff and <br />C:...\9307A1 O.REV <br />091021934pm 780-123R Revised - September 1993 <br />