2006-12-05_REVISION - M2001035 - Laserfiche WebLink

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Over a period of 5 to 15 years the flood outwash material would be mined down to the original topsoil layer that existed prior to 1900. This topsoil layer is a silt layer that has been located in other portions of the general permit azea The depth to this topsoil layer is estimated at 6 t6 15 feet in depth. The flood outwash materials aze generally very sandy and contain a wide variety of material sizes but generally they are smaller than boulder sized. The gravel pit would follow the curve of the granite outcrops that exist on the east side of the site, The end result would be a detention basin that would contain the excess water fiom the reservoir during the winter months and this water would percolate into the ground water in that azea. As the spring irrigation season begins, this detention basin would gradually dry up. Vegetation would need to be established in a manner that would comgliment this situation. ACA Products is working with the local Natural Resource Conservation Service staff regarding a vegetation plan and are agreeable to a plan that would help provide seasonal waterfowl/wildlife habitat. A vegetation proposal has not been identified to date. pond design would include shallow slopes (3:1 or less). The overall According to the letter from the office of the state water engineer "Should conditions at the site change whereby there was exposure of ground water, saturation of the sand and gravel in the mining azea due to a flow of water past the dam on Trout Creek Reservoir, or due to desire by the operator of the gravel mining operation to being washing of material onsite or use of water from the site for dust control it would be necessary to obtain a Substitute Water supply Plan approved pursuant to the above statute prior to continuing any further mining operations." The following are a series of photographs fiom the site location.