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Finding of No Significant Impact

Russellville Water Intake

Supplemental environmental assessment for the Russellville Water Works Board Section 26a approval for water intake at mile 32.4R on Cedar Creek Reservoir

Proposed action and need
Alternatives
Impacts assessment
Mitigation
Conclusion and findings
Link to EA

Proposed action and need

The Water Works and Sewer Board of the City of Russellville, Alabama, plans to begin construction of a raw water intake structure on TVA Tract Number XTBCCER-1PS after October 1, 2003. The City has requested that TVA provide a 14-day water level of 550.00 elevation to allow the contractors to excavate and construct the concrete channel for the intake structure.

Alternatives

On August 27, 2001, TVA adopted the EA prepared by the USACE which evaluated the environmental consequences of three alternatives, No Action, the Applicant’s Proposed Action, and the Applicant’s Proposed Action with Special Conditions. The supplemental EA evaluated the potential environmental impacts of the City’s request for a special drawdown of Cedar Creek Reservoir during construction.

Impacts assessment

The Reservoir Drawdown Alternative would have potential effects on recreation, water quality, and aquatic ecology. The drawdown would have no potential to affect historic properties. Effects from the special drawdown on public recreation resources, facilities and activities would be temporary and insignificant. The water quality and aquatic ecology impacts associated with the proposed drawdown are also expected to be minor and temporary. To ensure that the proposed action would have no effect on archaeological resources, TVA would undertake special patrols to prevent looting during the drawdown period.

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Mitigation

The following special conditions previously identified in the August 27, 2001, TVA FONSI are still needed and consequently would also be a requirement of the revised TVA approval. Commitments number 6 and 7 would still be needed in the event that the drawdown could not be maintained during construction. In addition, an additional commitment for TVA Police patrols will be added.

1. Water withdrawn from the proposed water intake shall not be transferred from the Tennessee River Basin to another river basin without prior approval of TVA.

2. The applicant will comply with all 18 conditions listed in the March 19, 2001 Section 401 Water Quality Certification issued by the Alabama Department of Environmental Management.

3. The proposed waterline must not provide connections for facilities that support development within the limits of the 100-year floodplain of streams within the water service area.

4. All items and equipment subject to flood damage on Cedar Creek Reservoir will be located above or floodproofed to the 100-year flood elevations 589.0.

5. All activities associated with construction, excavation and backfilling will occur during the dry season.

6. A floating turbidity curtain will be placed in the reservoir in an area surrounding the proposed excavation site.

7. The area in the location of the proposed pumping station will be dewatered. Wet cement contact with the reservoir will be avoided.

8. All excavated material, including rock materials used for the temporary cofferdam (if constructed) shall be disposed of properly and removed from the site above the 100-year floodplain elevation.

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9. The intake structure shall possess a screen or other mesh-like apparatus that would allow water to flow into the pipe but would prohibit or prevent fish and other aquatic species to become entrained in the structure.

10. Best Management Practices and Best Engineering Practices will be used throughout the life of the project to prevent the introduction of soil or any other pollutants into the reservoir, including immediate revegetation or other stabilization of disturbed onshore areas. This includes TVA standard BMPs 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, and 6i.

11. Any rock or riprap that covers trenches will be placed in a way that would not impede future stream flow or impede the migration of aquatic species. Elevation of the top of the riprap shall be no higher than the elevation of the existing streambed.

12. To prevent opportunistic looting of exposed archaeological sites, TVA Police will patrol the reservoir periodically during the 14 day drawdown, provided the national security level does not limit TVA Police’s resources in the area.

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Conclusion and findings

TVA has determined that with the implementation of regular patrol measures, there is no potential to affect historic properties. We also conclude that the proposed action would not be a major Federal action significantly affecting the environment. Accordingly, an environmental impact statement is not required.

Original signed by:
Jon M. Loney, Manager
NEPA Administration
Environmental Policy and Planning
Tennessee Valley Authority

Date: April 21, 2003

Link to the supplemental environmental assessment

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