Draft EIS_072312.pdf - Middle Fork American River Project ...

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 Intervenor Date Filed Horseshoe Bar Fish and Game Preserve, Bill Carnazzo, Hilde Schweitzer, and John Donovan (Foothills Water Network et al.) Interior August 5, 2011 El Dorado Water & Power Authority August 5, 2011 Forest Service August 8, 2011 1.4.3 Comments on the Application A notice requesting comments on the application was issued on June 7, 2011. The following entities commented: Commenting Agency and Other Entity Date Filed NMFS August 1, 2011 Forest Service August 5, 2011 California Department of Fish and Game August 5, 2011 Interior August 5, 2011 PCWA August 8, 2011 The applicant filed reply comments on September 6, 2011. 10
20120723-4002 FERC PDF (Unofficial) 07/23/2012 2.0 PROPOSED ACTION AND ALTERNATIVES 2.1 NO-ACTION ALTERNATIVE The no-action alternative is the baseline from which to compare the proposed action and all action alternatives that are assessed in the environmental document. Under the no-action alternative, the project would continue to operate under the terms and conditions of the current license. 2.1.1 Existing Project Facilities The existing Middle Fork Project consists of five developments: French Meadows, Hell Hole, Middle Fork, Ralston, and Oxbow. These developments include seven diversion structures, various water conveyance tunnels, pipes and penstocks, and five powerhouses. The locations of the various facilities and features are shown in figure 1, and a schematic of project facilities is provided in figure 2. 2.1.1.1 French Meadows Development The French Meadows development is on the Middle Fork and a tributary, Duncan Creek, and includes: (1) the Duncan Creek diversion consisting of: (a) a 32-foot-high, 165-foot-long, concrete gravity diversion dam with a crest at elevation 5,275 feet 8 and a 100-foot-wide uncontrolled ogee spillway; (b) a 2-acre pool at elevation 5,265 feet with 20-acre-feet of gross storage and negligible active storage; (c) a 10-inch-diameter instream flow maintenance pipe conveying flows to Duncan Creek with a maximum discharge of 8 cubic feet per second (cfs); (d) a 60-inch-diameter low level outlet pipe with a maximum discharge of 310 cfs; (e) the 1.5-mile-long, 9-foot-wide by 10-foot-high Duncan Creek-Middle Fork tunnel, routing water from the Duncan Creek diversion to the French Meadows reservoir with a maximum discharge capacity of 400 cfs; (2) the French Meadows dam and reservoir on the Middle Fork consisting of: (a) a 231-foot-high, 0.5mile-long rock and gravel-filled dam with a crest at elevation 5,273 feet and a 40-footwide spillway (extending to the Middle Fork American river about 1,000 feet downstream of the dam) with two 20-foot-wide radial gates; (b) a 1,408-acre reservoir at elevation 5,262 feet with 134,993 acre-feet of gross storage and 127,358 acre-feet of active storage; (c) an 8-inch-diameter instream flow maintenance pipe conveying flows to the Middle Fork with a maximum discharge capacity of 8 cfs; and (d) a 72-inch-diameter low level outlet pipe with a maximum discharge capacity of 1,430 cfs; (3) the 2.6-milelong, 12.3-foot-wide French Meadows-Hell Hole tunnel, which routes water from the French Meadows reservoir through the French Meadows powerhouse to the Hell Hole reservoir with maximum discharge capacity of 800 cfs; (4) a 6.25-foot-diameter, 691foot-long penstock conveying water from the reservoir to the powerhouse; (5) the 8 All elevations are referenced to mean sea level. 11
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69 Table 3.3.2-3. Hydrology for sel
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71 Exceedances and Summary Statisti
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91 Figure 3.3.2-6. Fish passage bar
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105 Location American River below M
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135 Species Name Status a Butte Cou
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145 Table 3.3.3-5. Special-status w
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147 Species Name Status Habitat Occ
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195 Figure 3.3.5-1. French Meadows
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197 Figure 3.3.5-3. Long Canyon, re
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253 Table 3.3.6-1. Archaeological a
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255 Resource Number Type a Descript
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275 Table 4-2. Summary of annual co
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279 Enhancement/Mitigation Measures
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303 c Base 2010 costs were provided
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307 Resource No-Action Alternative
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319 Table 5-2. Staff-recommended mi
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321 Location Middle Fork American R
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