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I I I I I I I I I I I I I I I I I I I Special Environmental Clearance Worksheet City of Loveland, Colorado Page 3 F. The Federal Disaster Assistance Administration (FDAA) and the U.S. Bureau of Reclamation (USBR), FDAA's technical advisor for project, have worked closely with the applicant and the applicant's consultant to insure that complete and accurate information was provided on the applicant's environmental assessment report (comparable to ECO-1), attached, Since the preparation of this report design changes have been made. These changes are explained in attachment A. Site inspections have been accomplished by FDAA and USBR on various occasions. Twenty-one (21) local, State and Federal agencies were formally contacted during and after the preparation of the applicant's report, Other agencies were contacted informally. The U,S, Army Corps of Engineers received no adverse comments after public advertisement associated with the Corps Section 404 permit application. G. Historic Preservation The Colorado Historic Preservation Officer has indicated tha~there are no properties listed on, or eligible for listing on, the National Register of Historic Places on the site, or in the vicinity of the proposed action, H. Evaluation of Impacts 1. Impact of Environment on Project a. Physical Environment (1) Beneficial Impacts - None (2) Adverse Impacts (a) Floods The proposed diversion dam and power plant replacement structures located within or adjacent to the Big Thompson river are susceptible to floods of varying magnitude. These floods historically have occurred as a result of intense localized thunderstorms within the 278 sq. mi, drainage area (above the power plant). The flood of July 31, 1976 represents the largest recorded peak flow for the river during a 112 year period of observation (30,500 cfs at the Loveland end of the canyon) . Floods having a 1% (100 year) or greater chance of occurrence would have no effect on the project since all components will be designed~o withstand such a flood without measurable damage. Since floods having less than a 1% chance of occurrence would affect the project to varying degrees, a study of the possible effects of a 0.2% (500 year) flood was undertaken. Results are as follows: