Laserfiche WebLink
REX E LOESBY PE 3037719632 <br />• <br />P. O1 <br />(e) Waste Files, Mine Onenlnes, Other Features: With the exception of drainage <br />features, all of these items aze covered in previous sections. Once Honing is complete, drainage <br />from the quarry will commence when water has filled the existing workings up to the lowest <br />possible exit elevation This is anticipated to be the tunnel driven by CYMC in 1990. Water <br />from this source will be piped to the sediment control structure at the toe of the waste pile from <br />which it will flow into Yule Creek. Maximum flow is estimated at 20 gpm Pumping to redact <br />the level of water in the quarry during spring runoff has never exceeded 33 gpm A 4-inch <br />drainage pipe with an intake screen will be placed in the tutttlel, under the access road, and down <br />to the sediment control structure. The pipe will be placed before the tunnel is backfilled so that <br />water will drain and not allow a buildup of presstue behind the backfill in the tunnel. The pipe <br />will be placed with a slight down slope so that ice will not form in the pipe to block it. <br />The sediment control structure at the toe of the waste pile will remain after mining is <br />complete. It is anticipated the pond will be cleaned out as needed during operations, and upon <br />completion of operations. A second cieanout is soheduled for two years after completion of <br />operation9. Experience by former employees of CYMC i~icates that very little sediment <br />collected in the pond during the early years of CYMC's operations. It was only after the <br />construction of the road around the east side of the south waste pile, and the resuking <br />mobilization of fines trapped in that pilo, that significant quantities of sediment collected. Baxd <br />on this experience, once the waste piles have had a chance to stabilize subsequent to any <br />operations, sediment runoff from the waste pile area should go almost to zero. <br />~t ,Reclamation Costs: Reclamation activities antleipated include backfdling smaller <br />quarry entries, fencing of larger quarry entries, sedimentation control structure cleanout, and <br />revegetation of approximately 1/3 acre of suriiiee area. The table below presents a cost estimate <br />of such work based on the assumption that an independent contractor is hired to complete the <br />work. <br />Item <br />Backfill Portals & Drainage Pipe (1) <br />Sediment Pond Cleanout (2) <br />Entry Fencing (3) <br />Subsoil Preparation (4) <br />Topsoil 1(auline (5) <br />Topsoil Spreading (6) <br />t3rass Seeding ~ Mulching (7) <br />Tree and Shrub Pktnting (8) <br />Remove Temporary Fencing, Cables, & Curtains (9) <br />frail Improvements (10) <br />Total Estitnatcd Reclamation Cost <br />estimated Cost <br />S 6,000 <br />1,600 <br />3,000 <br />640 <br />6,750 <br />640 <br />350 <br />1,650 <br />2,360 <br />1.920 <br />(1) Assume two portals, each 1fi feet by 16 feet Assume 500 yards of waste sock for each (600 feet of lineal fits in <br />the edits), for a total of 1200 yards A large loader will full the edits at the portals, followed by a large backhow to <br />add material above the portals and compact the waste to a height of approximately 6 fee} stave the top of the portal. <br />14 <br />