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<br /> <br />penetrate bedrock. Use of slurry walls and compacted slopes will ensure that the <br />proposed mining operation will not adversely impact domestic wells adjacent to the <br />Lyons site. (See RMC letter dated 1/23/97.) <br />After gravel mining operations have been completed and the reclamation plan has <br />been carried out, the area will lie almost entirely within the flood plain of the St. <br />Vrain. There will be no permanent structures within the area that will be subject to <br />damage. As a result of the gravel mining operation the flood storage area of the St. <br />Vrain will be increased to a moderate amount. It is not expected that this will have <br />any appreciable effect on moderating flood flows. There will be no filling within <br />either the floodway or the flood storage azea due to the proposed reclamation plan. <br />Within the site itself runoff will be collected in the ponds and will pass out <br />through a small channel into the south branch of the St. Vrain. Overflow structures <br />are also provided for each of the ponds, which will allow flood flows to pass through <br />the area back into the south branch. This will alleviate the potential problem of <br />rechannelization through the reclamation azea in the event of a flood. The floodway of <br />the existing St. Vrain channel will not be altered to any appreciable extent. The <br />proposed work will not increase the flood peak in the St. Vrain. <br />No permanent structures other than the overflow control structures will be <br />constructed in the reclamation azea. All construction will be of a type to blend into <br />the naturalized appearance of the surrounding area. Overflow structures will be <br />molded into the existing terrain and erosion protection will be provided. Small <br />overflow channels will be constructed between the ponds and from the east pond to <br />the south branch. Due to ground water conditions there will be a regular inflow- <br />outflow patterns of pond water and there will be a continuous flow of water to the <br />South Branch. <br />Water Storage Reservoirs <br />As demand for water has increased, so too has the need for water storage. Over <br />the past five years numerous excavated sand and gravel pits in the South Platte <br />drainage have been sealed for water reservoir use. In ] 996, Western Mobile received <br />final approval from the Office of the State Engineer for the Rockin' WP Lake 4 <br />reservoir. The reclamation plans for Lyons Rockin' WP call for the construction of <br />three additional water reservoirs, two at the request of lessors and one for the purpose <br />of augmentation. Appendix B contains various court documents, filings, and <br />approvals associated with the establishment of reservoirs for Lakes 4 and 5. <br />Westem Mobile Lyons -Rockin' WP G-6 <br />