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 Affected EnVIronments and EnVIronmental Consequences

3.11 CULTURAL RESOURCES

In addition to review under NEP A, consideration of impact to cultural resources is required
under Section 106 of the National Historic Preservation Act (NHPA) as implemented by 36 CFR
Part 800. Requirements include the need to identify significant historic properties that may be
impacted by the proposed action or alternatives. Historic properties are defined as archaeological
sites, standing structures, or other historic resources listed in or determined eligible for listing in
the National Register of Historic Places (NRHP) (36 CFR 60.4).

3.11.1 Alternative 1 - No Action

No activities would occur under the No Action Alternative; therefore, this alternative does not
have the potential to adversely impact cultural resources.

3.11.2 Alternative 2 -Improve Routing of Pawnee Creek Flood Flows (Proposed
Action)

The Colorado State Historic Preservation Office (SHPO) was contacted to determine if there
were any known cultural resource sites within the project area. In a letter dated September 28,
1998 (Appendix C), the SHPO indicated there are no identified sites in the project area. The
SHPO also indicated their information is incomplete as the project area has not been surveyed for
cultural resources. Therefore, there is a possibility that unidentified cultural resources exist
within the project area. The SHPO requested that a professional survey be conducted of areas
that would be disturbed prior to the start of construction. If any cultural resources are found
which are eligible to be listed on the NRHP, consultation with the SHPO would be required.

In the event that cultural resources are encountered during construction, activities would stop and
the SHPO and the Region VIII Environmental Officer would be contacted. Construction would
not resume until appropriate coordination and required mitigation had been completed.

3.11.3 Alternative 3 . Pawnee Creek Overflow Cutoff

Potential impacts of Alternative 3 are the same as discussed in Alternative 2. All areas that
would be disturbed would require a professional survey prior to the start of construction. If any
cultural resources are found which are eligible to be listed on the NRHP, consultation with the
SHPO would be required.

In the event that cultural resources are encountered during construction, activities would stop and
the SHPO and the Region VIII Environmental Officer would be contacted. Construction would
not resume until appropriate coordination and required mitigation had been completed.

3.12 HAZARDOUS MATERIALS AND WASTES

The American Society for Testing and Materials (1994) Standard E 1527-94 defines a recognized
environmental condition as "the presence or likely presence of any hazardous substances or

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