Laserfiche WebLink
~ ~ III IIIIIIIIIIIIIIII <br />Egviroqrr~eqt, Iqc.~` <br />LARRY E. O'BRIAN 7985 VANCE DRIVE, SUITE 205A <br />FOUNDER ARVADA,COLORADO 80003 <br />303-423-7297 <br />FAX 303-423-7599 <br />May 22, 2001 <br />Ms. Erica Crosby <br />Division of Minerals and Geology <br />1313 Sherman St., #215 <br />Denver, CO 80215 <br />RECEIVED <br />Dear Erica; MAY 2 ? 2001 <br />RE: Platte Sand b Gravel LLC ~~Y~S(0~~(MineralsandCeology <br />56H Mine, Permit # M-2000-158 <br />Continuance of hearing date <br />On behalf of Platte Sand & Gravel LLC (PS&G), I am responding to <br />the Technical Revision review sent to Mr. Hoffschneider last week. <br />This response addresses and expands on the plan submitted on April 20, <br />2001. it specifically addresses the four bullets on the first page of <br />your review. During design and installation of the armoring, whether <br />on the lake banks or river, PS&G will follow the guidelines in the <br />INSTREAM AGGREGATE AND RECLAMATION GUIDANCE DOCUMENT. If subsequent changes are <br />required to be made to this plan, PS&G will submit the proposed <br />changes to the Division of Minerals and Geology review and approval. <br />initially the site was looked at to identify areas of excessive <br />scour, the depth and velocity of floodwaters across the mined area and <br />along the river banks that might cause problems. identified were <br />areas along the river and on gravel pit slopes that are either lateral <br />berms or peninsulas perpendicular to the river, where flood water <br />could erode the banks and cause damage to structures. These areas are <br />where armoring will take place as mining progresses. <br />In addition, there may be areas on the river side of the bank <br />that may need armoring to protect the site. Prior to mining within <br />400 feet of the river Platte Sand & Gravel will prepare a map showing <br />the area where potential erosion could cause the river to enter the <br />excavation area. For example, there are three possible areas that may <br />be subject to erosive flows during a flood. They are the outside <br />edges of sharp bends in the river channel, adjacent to Meadow Lake, <br />Sharkey's Lake and Longhorn Lake. The map will be submitted to the <br />Division for review and approval. <br />