The City of Alamosa commissioned a new arsenic water treatment facility, which consisted of only one source of water and one elevated water storage tank for its potable water system. The city retained Olsson Associates to model a change in the potable water system, and to determine the best location for an additional elevated water storage reservoir and its associated pipelines to accommodate the community’s current needs and allow for future growth.
Based on the results of its modeling efforts, Olsson staff members prepared a feasibility study in the form of a preliminary engineering report. The study presented the modeling effort’s findings and culminated in the conceptual design of a new elevated reservoir and transmission pipelines. Following acceptance of the study conclusions, the Olsson team produced the preliminary and final design documents, including drawings and specifications for the improvements.
Olsson’s staff members also examined three potential sites for the new storage tank and selected the location that would best meet the community’s criteria. Olsson staff members selected a site that accommodated the installation of approximately 10,000 linear feet of 16-inch PVC pipe to serve the 1.25- million-gallon spheroid storage reservoir selected to serve the city.
The project involved extensive interagency coordination among railroad officials, Federal Aviation Administration representatives, Colorado Department of Transportation (CDOT) agents (to allow boring under the highway), and staff from the Alamosa County Roads and Bridges department.
Olsson’s initial construction estimates were $1.1 million for the pipeline work and $2.3 million for the storage tank. Bids came in under the estimates at $1.027 million for the pipeline and $2.27 million for the elevated storage tank. Pipeline construction, which involved two underground bores, and the reservoir were completed in the Fall of 2010.