PERMFILE119830 - Laserfiche WebLink

Home Browse Search

., Page 3 Mr. Smyth October 10, 1980 Since the proposed future use of these ponds is for wildlife habitat, pond shorelines and floors should provide for enough irregularity such that a natural appearing system would be created. Such irregularity of shorelines would be difficult to create by backfilling as proposed in the application, and further, would most likely be more costly than if shorelines ate created during excavation. Additionally, backfilling to create shorelines would be difficult to plan, and volumes would have to be calculnted which would show that sufficient material was available to carry out such a scheme. A buffer strip of at least SO feet,,should be lefC between the bankfull stage of the ponds and all property adjacent to the area to be permitted, and each ~ide of the intersecting irrigation ditches. Additionally, a 100 foo ~^vuffer strip should remain between the operation and St. Vrain Creek. 8. In order to mitigate any possible effects on the hydrologic balance, as a result of previous illegal activities, a 100 fooC wide buffer strip should be created along [he South boundary of St. Vrain Creek, from the bankfull stage of the creek on the previously affected land. The buffer should be created to an elevation of at least 4823 feet and rip-rap should be included along that portion of t)~e buffer adjacent to St. Vrain Creek. Ril>-rapping would require a 404 permit from the U. S. Army Corps of £n yi neers, however, since this recommendation (according to previous conversations with Tom David and Wayne Smyth of Weld County) is similar to that already recommended by the Army Corps, this should not pose a major problem. Additionally a 50 foot wide buffer to an elevation of 4823 feet should also be created on the eastern perimeter of the previously affected lands between the adjacent property owner's pond (John Slovek) and the existing 7+ acre pond created by previous mining activities. (t is anticipated that such Luffers will mitigate any possible increase in the flood hazard to the adjacent property owner as a result of the previous mining activities. AddiCionally, the buffer along the St. Vrain should return stability to that portion of the creek as affected by the pruvious operation. The proposed buffer strips could be modified if a hydraulic study on the area would justify such modifications. ~ 9. The Division of Wildlife report states that "operations near the St. Vrain should be avoided during peak wildlife use periods...occurring i~n October-December and February-March. In light of that report, the staff recommends that all operations remain at least 200 feet away from the Creek during those critical periods, unless the Division of Wildlife would allow for a closer operating range. (cont'd)