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2009-11-13_PERMIT FILE - C1982056A (7)
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2009-11-13_PERMIT FILE - C1982056A (7)
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Last modified
8/24/2016 3:56:58 PM
Creation date
2/10/2010 3:25:51 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056A
IBM Index Class Name
Permit File
Doc Date
11/13/2009
Doc Name
Pages 2.05-65 to 2.05-122.1
Section_Exhibit Name
2.05 Operation and Reclamation Plans Part 2
Media Type
D
Archive
Yes
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The water tank hazard trench demonstration consists of the successful treatment of 6.65 acres, of which 0.65 acres are <br />disturbed. SEDCAD+ modeling indicates a 10-year, 24-hour peak flow of 0.61 cfs. The trench will be mulched with 2 <br />tons/acre mulch, following seeding and prior to establishment of a vegetated channel. There are two rock check dams <br />in the trench; one at across-section T, shown on Sheet 3 in Exhibit 7F, and the other at the outfall of the trench. A 20- <br />foot vegetative filter below the lower rock check dam treats the remaining water. The outslope of the water tank trench <br />and anticipated associated construction disturbance consists of 0.44 acres, resulting in a peak flow of 0.42 cfs. The <br />disturbance will be treated with 2 tons/acre mulch and the downgradient 20-foot vegetative filter will achieve effluent <br />limitations fora 10-year, 24-hour storm. The SEDCAD+ demonstrations are included in Exhibit 8. <br />The east rockfall hazard trench demonstration consists of the treatment of 18.7 acres, of which 2.22 acres are disturbed. <br />SEDCAD+ modeling predicts a 10-year, 24-hour peak flow of 2.12 cfs. The trench will be treated with 2 tons/acre <br />mulch following seeding. A contour fiurow will be established approximately halfway (30 inches) up the cut to aid in <br />sediment retention. Rock check dams will be established at cross-sections P, N, and M, as well as at 255 feet below <br />cross-section O and 160 feet below cross-section N, as shown on Sheet 3 in Exhibit 7F. A 175-foot vegetative filter <br />below the outfall of the east rockfall hazard trench will result in achievement of effluent limitations following a 10-year, <br />24-hour storm. The outslope of the east rockfall hazard trench consists of 2.25 acres of fill and associated construction <br />disturbance, which is predicted to result in a peak flow of 2.16 cfs following a 10-year 24-hour storm event. The <br />outslope will be treated with 2 tons/acre mulch, and the mulch in combination with a 20-foot wide vegetative filter will <br />result in the achievement of effluent limitations following a 10-year 24-hour storm event. The SEDCAD+ <br />demonstrations are provided in Exhibit 8. <br />TCC plans to collect a limited number of discharge water samples at rock filters during a future precipitation event to <br />support current field observations. Samples will be compared to applicable stormwater limitations for settleable solids. <br />109 Diversion Filter -Drainage and sediment control for the 109 Diversion will be provided by an existing rock filter <br />adjacent to Pond F, the vegetation surrounding the site, and revegetation. The site is approximately 0.06 acres in size <br />and protected immediately upslope by a collection ditch; which limits surface ninon contributions to the site. <br />Southwest District Ventilation Borehole and Substation -Drainage and sediment control at the Southwest District <br />Ventilation Borehole will be provided by placement of afilter-fabric (silt) fence downslope from the site. In the event <br />the filter-fabric does not perform adequately to control sediment, the silt fence may be replaced with rock filters at <br />appropriate drainage points. The ventilation borehole site is approximately 0.2 acres. <br />Trout Creek Sandstone Test Site -Drainage and sediment control for this site will include revegetating site and use <br />of existing downslope vegetation (i.e. vegetation filter). The site is approximately 1.2 acres in size and is surrounded by <br />existing vegetation, which will serve to limit the amount of ninon to the site. During active drilling, a berm around the <br />site will divert upland flows around this area. <br />Fish Creek Tipple -Drainage and sediment control at Fish Creek Tipple involves the use of diversion ditches, <br />culverts, riprap, and Sedimentation Pond E. Details of the sedimentation control system for this site are found on <br />pages 2.05-16 through 2.05-19 of the Fish Creek Tipple Appendix, Volume VIII. <br />NMD Power Borehole -Drainage and sediment control for this site involves gravel surfacing of the pad and use of <br />the surrounding vegetation as a downslope vegetative filter. The site is approximately 1 acre and will be surrounded on <br />three sided by topsoil stockpiles, which will limit surface ninon to the pad. The SAE demonstration for this site is <br />presented in Exhibit 8.6. <br />NW Mains Ventilation Shaft and Thickener Underflow Proiect (TR 01-39) -Drainage and sediment control for <br />the NW Mains Ventilation Shaft site is provided by upgradient diversion and access road ditches, perimeter topsoil <br />berms, a rock containment berm/filter along the entire southeast side of the pad, pad topsoil stockpile collection <br />ditches, gravel surfacing, downgradient containment berm, and the combination of sump and rock check-dam at the <br />low point of the berm, and the natural vegetative filter existing between the shaft site and Fish Creek. Under <br />elevated flow conditions, discharges may pass through the sump and rock filter berm and flow into adjacent low- <br />lying areas. Under these conditions, effective control and treatment will still occur, since the sump and berm will <br />act as sediment traps, the flow path will be extended, and the low-lying areas and vegetative filter will serve to <br />TR09-66 2.05-84.3 04/11/09 <br />
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