FLOOD09522

• County: Logan
• Community: Sterling, Atwood
• Basin: South Platte
• Title: Pawnee Creek Flood Mitigation, City of Sterling, Town of Atwood and Logan County
• Date: 7/1/1999
• Prepared For: Logan County
• Prepared By: URS Greiner Woodward Clyde
• Floodplain - Doc Type: Flood Mitigation/Flood Warning/Watershed Restoration

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SECTION THREE ARected Environments and Environmental Consequences

petroleum products on a property under conditions that indicate an existing release, a past
release, or a material threat of a release of any hazardous substance or petroleum products into
structures on the property or into the ground. or surface water of the property." No Hazardous
materials are known to occur within the project area, and during the site visit on August 26 and
27, no hazardous materials were identified in the project area. Therefore, hazardous materials
would have no impact on any ofthe alternatives.

3.13 CUMULATIVE IMPACTS

Cumulative impact is defined as ..the impact on the environment which results from the
incremental impact of the action when added to other past, present, and reasonably foreseeable
future actions." Cumulative effects are not wholly different effects from direct or indirect effects
of an action. Cumulative effects are merely a way of placing seemingly isolated or insignificant
direct and indirect effects in context with respect to overall impacts, both over time and in an
area larger than that evaluated for direct and indirect effects. Cumulative effects are discussed in
terms of being additive, synergistic, or reductional.

Presently, no other projects are ongoing or planned in Logan County. The cumulative effects of
these actions described for Alternatives 2 and 3 would be additive and positive. They would
reduce the potential for flooding along lower Pawnee Creek.

3.14 COORDINATION AND PERMITS

Coordination was conducted with the following federal, state, and local agencies during the
preparation of this EA. Any additional coordination or permits if required prior to
implementation of an alternative are also identified.

U.S. Fish and Wildlife Service

No federally-listed threatened or endangered species or species proposed for federal listing
would be adversely affected by the proposed project. Therefore, no additional coordination
required.

U.S. Army Corps of Engineers

Alternative 2 would require a 404 Permit. The USACE strongly recommends the applicant and
design engineer meet with the USACE representative in the field prior to finalizing design or
submitting their 404 Permit application (R. Flecher, US ACE, personnel communication, 1999).
The 404 B-1 criteria of avoidance and/or minimization of impacts on wetlands must be
demonstrated before the USACE will issue a 404 Permit. The USACE, in consultation with the
Colorado Department of Public Health and the Environment, would also be responsible for 401
Certification prior to issuing the 404 Permit.

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