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Engineers' Commen~Pikeview Quarry • <br />- Per Letter of Apri 12, 1979 <br />Page 6. <br />Question qS--Comment Continued <br />Tract "B" (25 Acres): <br />Reclamation to begin in the year 1990, after the mining operation has <br />been completed on approximately 12 acres. This reclamation is to last <br />for approximately 4 years (1 year planting and 3 years maintenance). <br />After the mining operation is completed in this entire tract, <br />reclamation will commence on the remaining 13 acres. <br />Tract "C" (14 Acres): <br />Reclamation to begin in 1987, and last for approximately 4 years. <br />C. WATER CONTROL SYSTEMS <br />uestion: Water control systems should be carefully explained indicating <br />ow the quarry will be protected from severe erosion. This should address <br />the use of diversion canals, settling ponds, and other pertinent measures. <br />Comment: On May 15, 1979, an inspection was made in the Pikeview Quarry <br />for erosion caused by recent heavy rains. During this inspection we could <br />not locate any noticeable erosion except for a relatively small area at <br />the side slopes of the limestone waste stockpile. The rationale for <br />determining runoff and the reconmendations for water diversions are <br />i explained as folloo-rs: <br />All surface runoff from Pikeview Quarry and that area West of the <br />Quarry is to Douglas Creek, a tributary of Monument Creek. The <br />site is located in the upper portion of three (3) sub-basins of <br />Douglas Creek, as shown on Attachment No. 5. The three sub-basins <br />are relatively small, being approximately 60 acres in size. <br />North Drainage: <br />Surface runoff from the North sub-basin is directed to stream flow <br />across the most Northerly 10 acres of the site. As this stream flow <br />crosses the mining area it is recommended the four (4) check dams be <br />installed at 200 foot intervals within this area. Three (3) additional <br />check dams would be installed at the Easterly side of the site where I <br />the stream flows beside the interior mining road. (See Attachment N5 <br />for locations of check dams.) These check dams would reduce velocities, <br />erosion, and retain sediment. Sediment tirould be removed from behind <br />these check dams periodically. Depending upon development of the i <br />~ industrial site and specific demands for fire flow, afire retention <br />