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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />B. Design Criteria <br /> <br />Concrete tank design will be in compliance with AWWA 0-110, Standard for Wire-Wound <br />Circular Prestressed Concrete Water Tanks. Steel tank design will be in compliance with either <br />AWWA 0-100, Standard for Welded Steel Tanks for Water Storage, 'or AWWA 0-103, Standard <br />for Factory-Coated Bolted Steel Tanks for Water Storage. <br /> <br />C. Map <br /> <br />Not Applicable <br /> <br />D. Environmental Impacts <br /> <br />An insulated steel tank would be constructed above grade and would have a greater visual <br />impact than the concrete tank alternative, depending upon the tank site. A pre-stressed or <br />reinforced concrete tank could be completely or partially buried, and would present less of a <br />visual impact. <br /> <br />E. Land Requirements <br /> <br />Land requirements are basically the same for all alternatives. These are discussed in more detail <br />under the individual tank site alternatives, Section V.3 and V.4 <br /> <br />F. Construction Problems <br /> <br />Construction of either tank type does not pose any notable construction problems. However, <br />a buried concrete tank would require more excavation and regrading, and would increase the <br />likelihood that site work would include some rock excavation. Site work costs would be <br />expected to be higher with a buried tank, and would rise even more if blasting were required <br />to remove bedrock. A buried concrete tank would require installation of a foundation drainage <br />system along the base of the of the constructed walls. Erosion control fabrics will be installed <br />on disturbed slopes to minimize erosion due to runoff, <br /> <br />G. Cost Estimate <br /> <br />Table 9 compares the estimated costs for constructing a 600,000 gallon storage tank using each <br />of the three types of tanks considered under this alternative. The earthwork costs for both the <br />pre-stressed and reinforced concrete tanks consider a half-buried tank, set into the valley slope. <br />The steel tank earthwork costs include the costs associated with a concrete ringwall foundation. <br /> <br />Town of Minturn Water System Upgrade Project, March, 1995 <br /> <br />22 <br />