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0 Greg Lewicki And Associates <br />• <br />• <br />August 25, 2011 <br />Travis Marshal <br />Division of Reclamation Mining and Safety <br />101 South 3rd Suite 301 <br />Grand Junction, CO 81501 <br />(970)- 241 -2042 <br />Mr. Marshal <br />11541 Warrington Court Phone (303) 346 -5196 Fax: (303) - 346 -6934 <br />Parker, CO USA 80138 E- Mail:info@lewicki.biz <br />RE: Craig Ranch Pit - Stormwater Response, Permit # M- 1986- 002 /CN -01 <br />Based on the discussions between Tim G, Greg Lewicki, and yourself, the following items have <br />been implemented as part of the amended permit conversion application for the Craig Ranch Pit. <br />This memo is a summation of the items for the Division's convenience. <br />1. After topsoil material is placed at each of the "islands" it will be roughened using a <br />backhoe bucket. This should aid in water retention and therefore vegetation growth at <br />each island. <br />2. If a natural channel of appropriate size does not exist in the bedrock beneath the gravel <br />upon excavation, a channel will be installed via a dozer and ripper. This is done to <br />maintain the pre -mine drainage patterns on the site. <br />3. In order to encourage fast vegetation establishment in the islands, Quick Guard, a sterile <br />annual triticale companion crop that has been successful in establishing initial vegetation <br />stands, will be added to the revegetation seed mix. This will be done at a rate of 10 <br />pounds of live seed per acre. <br />4. The eastern sediment pond in the property will also be the site of a vegetation island. <br />5. The drainage channel for SWB 6 as shown on Map G, will not be mined within 10 feet of <br />the channel. This is to protect the natural channel that has formed in the bedrock. <br />6. The western sediment pond will be dug five feet down into the natural grade, and the <br />eastern pond will be dug down one foot. Since both ponds will be incised to contain the <br />100 -year event, there is no need for gravel berms. <br />7. Spillways will be constructed at both the east and west sediment ponds. These spillways <br />will be eight feet wide at the bottom, with 2H:1 V sideslopes, and have a total depth of 1.5 <br />feet. The bottom and sides of the spillways will be armored with rock that has a D50 of six <br />inches. Each of these spillways will be built long enough to reach the natural drainages <br />on the north side of their respective ponds. <br />