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Army Corps of Engineers accepting public comments for Lake Powell Pipeline
January 07, 2019
APPLICANT: Utah Division of Water Resources, Attn: Mr. Eric Millis, 1594 West North Temple, Salt Lake City, Utah 84116
LOCATION: The approximately 150-mile-long project site is located in parts of Coconino and Mohave counties, Arizona, and Kane and Washington counties, Utah. The latitude/longitude of the approximate center of the pipeline alignment is 39.9892°N, -112.4276°W. The Lake Powell Intake would occur in Section 24, Township 41 North, Range 8 East of the Gila and Salt River Meridian, AZ. The terminal point of the pipeline at Sand Hollow Reservoir would occur in Section 30, Township 42 South, Range 13 West of the Salt Lake Meridian, UT. The project location can be seen on the Little Creek Mountain, The Divide, Smithsonian Butte, Lost Spring Mountain East, Colorado City, Maroney Well, Pipe Valley, Pipe Spring, Clear Water Spring, Shinarump Point, Muggins Flat, Johnson Lakes, Petrified Hollow, Pine Hollow Canyon, Eightmile Pass, Fivemile Valley, West Clark Bench, Bridger Point, Glen Canyon City, Lone Rock, Ferry Swale, and Page USGS Topographic Quadrangles.
PROJECT DESCRIPTION: The Lake Powell Pipeline (LPP) Project would deliver a portion of the State of Utahs Colorado River water from Lake Powell to the service areas of Washington County Water Conservancy District (WCWCD) and Kane County Water Conservancy District (KCWCD), and would include energy recovery through hydropower generation (Figure 1-1). The Applicants proposed project would include six lateral intake tunnels from Lake Powell, 140 miles of a 69-inch-diameter steel pipeline (starting at Lake Powell and terminating at Sand Hollow Reservoir), a forebay, an afterbay, hydro stations, booster pump stations, a regulating tank, and a power transmission line (including substations and switch stations). Based on the available information, the overall project purpose is to construct a water conveyance and hydroelectric system spanning from Lake Powells Glen Canyon Dam in Page, Arizona, to water storage facilities near St. George, Utah, to bring a necessary second source of water to Washington and Kane Counties to meet future water demands through 2060. The applicant believes that LPP will diversify the regional water supply portfolio and enhance its reliability, while also generating electric supplies. The LPP will supply up to 86,249 acre-feet of existing Colorado River water rights to Washington County (82,249 acre-feet) and Kane County (4,000 acre-feet), while supplying water to operate the proposed hydroelectric developments at multiple points along the pipeline. The applicant believes there is a need to bring a necessary second source of water to Washington and Kane Counties to meet future water demands through 2060 and to diversify the regional water supply portfolio and enhance its reliability, while also generating electric supplies. The attached drawings provide additional project details.
Alternatives. The applicant has provided information concerning project alternatives, which are discussed in the attachments to this notice. Additional information concerning project alternatives may be available from the applicant or their agent. Other alternatives may develop during the review process for this permit application. All reasonable project alternatives, in particular those which may be less damaging to the aquatic environment, will be considered.
Mitigation. The Corps requires that applicants consider and use all reasonable and practical measures to avoid and minimize impacts to aquatic resources. If the applicant is unable to avoid or minimize all impacts, the Corps may require compensatory mitigation. The applicant has proposed to avoid any impacts to wetlands and implement construction best management practices, including minimizing clearing of riparian vegetation, working in dry or low-flow conditions, stockpile native substrates from impacted waters and restore temporarily impacted areas to approximate pre-project conditions wherever practicable. The applicants proposed mitigation for unavoidable impacts to approximately 4.21 acres/32,540 linear feet of dry ephemeral drainages that would be filled or flooded as a result of the project includes 1) conducting a functional assessment of the drainages that would be lost and ensuring that the forebay and afterbay would provide some replacement functions, 2) establishment and enhancement of riparian vegetation along the Virgin River, and 3) construction of replacement ephemeral drainages.
HISTORIC PROPERTIES: Potentially eligible cultural resources may be affected by the proposed project. The Corps has designated the Federal Energy Regulatory Commission (FERC) as lead Agency for Section 106 National Historic Preservation Act compliance. Cultural resources coordination for the project are ongoing.
ENDANGERED SPECIES: The proposed activity may affect Federally-listed endangered or threatened species or their critical habitat. The Corps has designated FERC as lead Agency for Section 7 Endangered Species Act compliance. As lead Agency, FERC is consulting with the U.S. Fish and Wildlife Service for Endangered Species Act compliance.
ESSENTIAL FISH HABITAT: The proposed project would not adversely affect Essential Fish Habitat (EFH) as defined in the Magnuson-Stevens Fishery Conservation and Management Act.
The above determinations are based on information provided by the applicant and our preliminary review.
EVALUATION FACTORS: The decision whether to issue a permit will be based on an evaluation of the probable impacts, including cumulative impacts, of the described activity on the public interest. That decision will reflect the national concern for both protection and utilization of important resources. The benefit, which reasonably may be expected to accrue from the described activity, must be balanced against its reasonably foreseeable detriments. All factors which may be relevant to the described activity will be considered, including the cumulative effects thereof; among those are conservation, economics, aesthetics, general environmental concerns, wetlands, historic properties, fish and wildlife values, flood hazards, floodplain values, land use, navigation, shoreline erosion and accretion, recreation, water supply and conservation, water quality, energy needs, safety, food and fiber production, mineral needs, consideration of property ownership and, in general, the needs and welfare of the people. The activity's impact on the public interest will include application of the Section 404(b)(1) guidelines promulgated by the Administrator, Environmental Protection Agency (40 CFR Part 230).
The Corps is soliciting comments from the public, Federal, State, and local agencies and officials, Indian tribes, and other interested parties in order to consider and evaluate the impacts of this proposed activity. Any comments received will be considered by the Corps to determine whether to issue, modify, condition, or deny a permit for this proposal. To make this decision, comments are used to assess impacts on endangered species, historic properties, water quality, general environmental effects, and other public interest factors listed above. Comments are used in the preparation of an Environmental Assessment and/or an Environmental Impact Statement pursuant to the National Environmental Policy Act. Comments are also used to determine the need for a public hearing and to determine the overall public interest of the proposed activity.
If you have questions or need additional information please contact the applicant or Corps project manager Matt Wilson, (801)295-8380, ext. 8311, Matthew.S.Wilson@usace.army.mil.
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