City Council Minutes 1976 05 04 - Laserfiche WebLink

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WATER TANK ALTERNATIVES CONT'D (1) Preliminary analysis indicated size required would be in the range of 2.5MG to 3MG, the 3 million gallon tank was chosen. (~) Location had to fit in with 2 major constraints - one was the existing treat- ment plant so that it would operate at a higher capacity, ultimately 5MG per day - secondly, the City's system itself so that the tank would not be built in a hole and not be able to discharge by gravity into the City's water system. (3) Field Services - an update of the piping in the water treatment plant itself, and the findings and location of existing water mains serving the City. Those lines installed many years ago were not mapped and had to be physically located. We surveyed existing City property and property to be required. Had a soils and founda- tion investigation done. The findings indicated the hydraulics of the plant to operate at 5MG per day required the top of the water of the tank to be at least 14' below the top of the water in the filter beds. Minimum amount of water in the tank to be at an elevation of 5535' USGS datum to get water into the city through the existing water facil- ities. A tank was designed having an in- side diameter of 146' and 24' depth of water. (4) Design - steel, concrete cast and place facility with twin T roof, prestress concrete. We have designed all these with the exception of pre-stress concrete which will be put out under performance speci- fications, allowing more people to bid on the facility. Foundation for all alter- nates will be structural slab on drilled piers. (5) Special use review - we submitted to Boulder County a proposal summary and development report on April 7, 1976 and it will come before the Commissioners on June 16, 1976. We will meet with Boulder County staff May 12, 1976. The only com- - 6 -