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I I I I I I I I I I I I I I I I I I I 6 3. Aeration Basins. The aeration basins are located on the same high ground as the primary clarifiers. They are located outside of the floodway and therefore, can be modified as necessary. 4. Secondary Clarifiers. The secondary clarifiers are located within the floodplain. Additionally, the southern portion of the complex is located within the floodway. Any additions to the secondary clarifier complex must be constructed to the north of the existing clarifiers outside of the floodway, but must be floodproofed. 5. Blower Building. The blower building is located within the regulatory floodway. The building itself, however, is on raised ground above the 100-year floodplain elevation. Modifications to the blower building must be confmed within the existing building footprint. 6. Chlorine Fa:cilities. The chlorine facilities are located within the regulatory floodway. Again, the building is constructed on raised ground above the floodplain. Facility improvements should be confmed to within the existing building. The possibility exists that the building could be expanded to the north outside of the floodway. This will need to be carefully analyzed after FEMA addresses the request for a LOMR. 7. Sludge Dige1.1er Complex. Most of the sludge digester complex is located within the floodway and it is entirely within the floodplain. Floodway regulations may limit construction within this complex. CONCLUSION The City of Greeley's Water Pollution Control Facility (WPCF) is presently totally contained within the regulatory floodway of the Cache La Poudre (Poudre) River. Regulatory compliance dictates that no expansions can be made to the plant that could adversely impact the floodway. Since the date of floodway delineation by the Federal Emergency Management Agency (FEMA), considerable changes have been made which impact the floodway. Most notably are the construction of replacement bridges crossing the Poudre at Ash Avenue and at 8th Street. These bridges cause a reduction in the floodway and lower the 25-, 50- and 100-year water surface proflles. The magnitude of the changes justifies an application for a Letter of Map Revision (LOMR) to redefine the regulatory floodplain and floodway. The accompanying documentation provides a basis for requesting a LOMR. This would remove large areas of the WPCF from the floodway. Additionally, the lowered lOO-year flood profile would place plant components that are on naturally high ground out of the floodplain. The resultant regulatory boundaries would permit most of the contemplated plant modifications to be constructed without violating floodway ordinances. ,..,~.: '; , -.' 21/7387