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

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20120723-4002 FERC PDF (Unofficial) 07/23/2012 • Middle Fork interbay sediment disposal area • Passive microwave reflector station and access trail • Middle Fork American River below interbay dam gage and access trail • Middle Fork powerhouse, penstock and butterfly valve house access road • Spoil pile at Middle Fork penstock • Brushy Canyon adit access road • Junction Bar augmentation area • Ralston-Oxbow tunnel intake to Ralston powerhouse communication line • Ralston Ridge sediment disposal area • Passive microwave reflector station above Ralston afterbay and access trail • Reduce the project area to remove lands that are not necessary for operation and maintenance of the project. The project boundary would be reduced to remove excess lands currently within the existing project boundary that PCWA believes are not necessary for operation and maintenance of the project (particularly around the project reservoirs). Areas where land within the project boundary would be reduced include: • Duncan Creek-Middle Fork tunnel corridor • French Meadows reservoir shoreline buffer • French Meadows-Hell Hole tunnel corridor • Hell Hole reservoir shoreline buffer • Hell Hole-Middle Fork tunnel corridor • Middle Fork-Ralston tunnel corridor • Ralston afterbay shoreline buffer PCWA estimates its proposed project area would encompass 4,150 acres of land including 3,056 acres of lands of the United States (1,746 acres within the Tahoe National Forest, 1,306 acres within the El Dorado National Forest, and 4 acres of lands managed by the U.S. Bureau of Land Management). The remainder of the project area would be located on PCWA-owned land or private land. 24
20120723-4002 FERC PDF (Unofficial) 07/23/2012 2.2.3 Proposed Project Operation PCWA proposes several modifications to project operations consistent with its proposed Instream Flow and Reservoir Minimum Pool measure. The measure would require: • higher minimum instream flows in the bypassed reaches and the peaking reach ( downstream of the Oxbow powerhouse); • spring pulse flows in the bypassed reaches; • downramping of spill flows from May through July below Hell Hole reservoir and French Meadows reservoir; • modified ramping rates at Oxbow powerhouse the peaking reach; • a cap on flow releases from Oxbow powerhouse (Saturday of Memorial Day weekend to Labor Day) in dry, critical, and extreme water years; • consultation with representatives for the two annual trail races to identify and provide flows suitable for adequate peaking reach trail crossing conditions (when flows are controllable by the project); • recreational flow releases in the peaking reach; and • modified minimum reservoir pool requirements in Hell Hole reservoir and French Meadows reservoir. PCWA also proposes to increase the available storage volume in Hell Hole reservoir by installing a new 6-foot-high Obermeyer spillway gate along the top of the existing dam crest and increasing the maximum storage elevation of the reservoir. PCWA states that this increase would allow the reservoir to store additional water during the spring and summer after the peak of the runoff period which can later be used to increase annual energy generation. In all but the driest years, PCWA indicates that the improvement would also allow the project to shift the timing of some generation from the spring runoff period to the summer peak energy demand period. Although the shift in timing of the generation would not increase total annual generation, PCWA states that it would increase the benefit of the project by increasing generation during the peak energy demand period. These project modifications are discussed in more detail in the appropriate resource sections in sections 3 and 4 of this EIS. 2.2.4 Proposed Environmental Measures PCWA proposes the following mitigation, protection, and enhancement measures. Geology and Soils • Implement the Sediment Management Plan. 25
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79 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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