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

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12 Figure 2. Middle Fork Project schematic (Source: USGS, 2012).
20120723-4002 FERC PDF (Unofficial) 07/23/2012 45-foot by 68-foot French Meadows powerhouse housing a Francis-type unit with an authorized installed capacity of 15,300 kW discharging tailrace water to the Middle Fork; and (6) the French Meadows switchyard. 2.1.1.2 Hell Hole Development The Hell Hole development is located southwest of the French Meadows development on the Rubicon River and includes: (1) the 410-foot-high, 1,570-foot-long Hell Hole dam with a crest at elevation 4,650 feet and a 350-foot-wide uncontrolled spillway; (2) the 1,253-acre Hell Hole reservoir at elevation 4,630 feet with 207,590 acrefeet of gross storage and 205,057 acre-feet of active storage; (3) an outlet tunnel that leads to a 16-inch-diameter instream flow maintenance pipe conveying flows to the Rubicon River with a maximum discharge capacity of 20 cfs and a 48-inch-diameter low level outlet pipe conveying flows to the Rubicon River or to the powerhouse penstock with a maximum discharge capacity of 852 cfs; (6) a 100-foot-long, 48-inch to 20-inchdiameter penstock conveying water from the low level outlet pipe to the powerhouse; and (7) the 24-foot by 26-foot Hell Hole powerhouse that houses a Francis-type unit with an authorized installed capacity of 725 kW discharging tailrace water to the Rubicon River. 2.1.1.3 Middle Fork Development The Middle Fork development is located on the Middle Fork and on two tributaries (North Fork and South Fork) of Long Canyon Creek (a tributary of the Rubicon River) and includes: (1) the North Fork Long Canyon Creek diversion consisting of: (a) a 10-foot-high, 120-foot-long diversion dam with a crest at elevation 4,720 feet; (c) a 12-inch-diameter instream flow maintenance pipe conveying water to the North Fork with a maximum discharge capacity of 2 cfs; (d) a 36-inch-diameter low level outlet pipe with a maximum discharge capacity of 100 cfs; (e) a conveyance structure that routes water from the diversion to the Hell Hole-Middle Fork tunnel consisting of a 36inch-diameter, 0.7-mile-long buried steel pipe, a 403-foot-long, 6-foot-diameter vertical shaft, and a 54-foot-long tunnel with a maximum capacity of 100 cfs; (2) the South Fork Long Canyon Creek diversion consisting of (a) a 27-foot-high, 145-foot-long c diversion dam with a crest at elevation 4,650 feet and a 60-foot-long uncontrolled ogee spillway; (c) a 12-inch-diameter instream flow maintenance pipe conveying flows to the South Fork with a maximum discharge capacity of 5 cfs; (d) a 36-inch-diameter low level outlet pipe with a maximum discharge capacity of 140 cfs; (e) conveyance structure that routes water from the diversion to the Hell Hole-Middle Fork tunnel and consisting of a 42inch-diameter, 50-foot-long buried steel pipe, a 387-foot-long, 6-foot-diameter vertical shaft, and a 27-foot-long tunnel with a maximum capacity of 200 cfs; (3) the Hell Hole- Middle Fork tunnel that routes water from the Hell Hole reservoir to the Middle Fork powerhouse penstock and is a 13.4-foot-wide, 10.4-mile-long, horseshoe-shaped tunnel with a maximum capacity of 920 cfs; (4) the Hell Hole-Middle Fork tunnel surge shaft and tank located 1,800 feet from the tunnel outlet and consisting of an 8-foot-diameter surge shaft and a 60-foot diameter by 22-foot high above-ground surge tank; (5) a 07- 13
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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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