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7c. Boundaries between the roads and the non-road disturbance areas are now clearly <br />defined. Appropriate designs aze provided for the non-road areas. Designs for the <br />road areas are not shown in detail since these areas are exempt. <br />7d. The primary drainage tributazy to area A empties onto a relatively flat azea of the post- <br />reclamation topography. Extensive deposition is expected as flows from the <br />undisturbed azea enters in this location. Provisions have been made allowing for much <br />of the coarser sediment to drop out prior to entering the silt fence containment area. <br />The primary reason and focus for the Swale design is to treat runoff from the up- <br />gradient undisturbed slopes as these aze the primary source of sediment. <br />No other drainage feature of notable size exists above either iA or 1B. Only one <br />much smaller ephemeral drainage of notable size exists on the road east of area A. <br />This occurs on a relatively gentle slope. A rocked channel will be constructed to carry <br />this flow commensurate with the size of the natural channel. <br />Many other very small erosional features exist in the natural slopes above the site. We <br />anticipate some problems if heavy runoff events occur. The need for minor repairs is <br />expected and routine inspections with appropriate measures to stabilize the site will be <br />routine. <br />10. See response to Item 7, above. The undisturbed area topography is clearly show on <br />Map 86. <br />12. As discussed in my letter of January 29, 2001, mulching is not absolutely necessary at <br />the East Portal Area. SEDCAD designs and demonstrations were performed assuming <br />no mulch. Straw mulching following surface roughening could not be properly <br />crimped while maintaining the benefits of the surface roughening. Therefor, Section <br />V.I.4.c was amended to allow netting to hold down the mulch instead of crimping in <br />case mulching was performed. <br />Section V.I.4.d has also been amended to specifically address more substantial surface <br />roughening by ripping, track-hoe gouging, or other means as appropriate. <br />If you have any further questions please contact me at 970-675-4322. <br />Sincerely, <br />-~ ~-C/ ' - <br />Scott Wanstedt <br />Environmental Engineer <br />swanstedt(a~deserado.com <br />enc: <br />cc: Jeff Dubbert w/o <br />Max McCoy - BLM <br />Deena Cabot -Town of Rangely <br />,r <br />