1975-01-20 Regular Meeting - Laserfiche WebLink

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• • expansion that is needed. Since the land is already given over to this use, additional construction of the same type will not materially affect the adjacent land value. No dredging or tunneling will be involved in this project. Trenching will be done along existing road and street rights-of-way and will be backfilled continuously to within a maximum of 200 feet of the pipe laying operation. Consequently there is no reason to expect any effect from these construction methods in area waterways. Since there are two operating treatment plants with ample capacity to handle the influent to them, there is no need for any bypassing during the con- struction period because of the construction. However, bypassing does occur during periods of extreme wet weather, so this condition will continue to exist. The period of bypassing from wet weather flows is usually short depending upon the amount of rainfall. For example, on one occassion, bypassing lasted about fourteen hours as a result of a 5.4 inch rainfall in a two day period. At this time nothing can be done to minimize the impact of the wet weather bypassing. Of course, eliminating the infiltra- tion/inflow which causes the bypassing, is one purpose of this project. Dust is not no~"mally a construction problem in this area because of the nature of the soil and the relatively high rainfall rate. If the ground does get extremely dry, any dusting problem will be controlled by periodic watering by truck. The majority of the proposed construction noise will be concentrated in a remote site where the sewage treatment plant expansion is planned. The nearest residence to this site is 500 feet or more away. The other construction noise will be of a much lesser degree and will be that occurring along road and street rights-of-way where the pipe ditching operations will be done. The only precautions deemed necessary for pro- tection of residents and wildlife from the construction noise will be to have adequate mufflers on the exhaust systems of all motorized equipment. There will be no blasting carried on in connection with the proposed construction. All of the construction planned in this project will be situated in areas where little or no vehicle and pedestrian traffic will be disrupted. The work on the treatment plant expansion is remote from traffic, etc., and the other work done in rights-of-way can be done in such a way to have at least one lane of traffic open at all times. Whenever and wherever con- struction work is proceeding precautions will be taken to exclude the public from the area by means of warning signs, flagmen and barricades. It is not anticipated that any night work will be performed on this job. At the end of each work day the Contractor will be required to board over and barricade all excavations with flashing lights. Long Term Impact - The land that will be permanently affected by this project is approximately four acres owned by the city adjacent to the existing. treatment plant. This is the site of the proposed expansion. It is presently vacant land and is situated in a large tract of vacant ,~.