CCP 02-22-2000 - Laserfiche WebLink

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I I. I I I I I I I .. I I I I I I I. I I B. Existing Infrastructure This section provides an overview of key components of the existing infrastructure system at TCAAP. For the purposes of this report, the term "infrastructure" includes the sanitary sewer, water, drainage, transportation, electrical and natural gas systems. Information was obtained from utility maps, record drawings, aerial photographs and other documents. Information sources included Federal Cartridge Company; the Cities of Arden Hills, Shoreview and Mounds View; the TCAAP Resource Library; Metropolitan Council Environmental Services; and the Rice Creek Watershed Management Organization. Please note that this overview is not a complete summary or detailed analysis of the infrastructure on TCAAP, but rather a broad overview of key infrastructure components in and around the site. 1. Site History Understanding the history of the site is critical in estimating the age and condition of the existing infrastructure. Many of the infrastructure components are located on the southerly and westerly portions of the site. The south side was the fIrst area to be constructed, with work beginning in the fall of 1941. This area is called the "upper area," and the buildings consist mostly of wood-frame construction. The upper area was built by a large labor force that completed construction in only six months over the winter of 1941 and 1942. The westerly part of the site is called the "lower area" and was constructed during the 5- to 10- year period following construction of the upper area. Buildings in the lower area consist mostly of masonry type construction. Over time, infrastructure was expanded to the east and north. However, fewer resources were devoted to infrastructure in these areas because the natural topography was less conducive to construction. Many of the original buried utilities installed in the early 1940s are still in place. Although some have been abandoned, a surprisingly large percentage are still being used today. Some updates and expansions occurred as a result of repairs, failures, etc., or due to development changes around the perimeter of the site. A variety of pipe materials was used. Non.metallic pipe materials were probably substituted for cast iron during war-time periods when metal was scarce or costly. Alliant Tecb Systems currently occupies Buildings 103, 104,502 and 576. Accordingly, a portion of the site utilities are utilized by Alliant Tech Systems. These utilities include sauitary sewer, water, natural gas, electricity and telephone. 2. Sanitary Sewer System When site construction began in 1941, the closest wastewater treatment plant was located in Minneapolis. A large sanitary sewer pumping station was constructed in the southwest part of TCAAP and two parallel force mains (18- and 24-inch diameter) were run the 24 miles between TCAAP and Minneapolis. The original sanitary sewer facilities included the main pumping station as well as a newer, smaller pumping station, whicb served the northerly part of the site and pumped sewage south toward the main station. The collection system consists of sewer mains ranging in size from 6 incbes to 24 inches in diameter. Approximately 16 miles of pipes are included in the system. Pipes were made from a variety of materials, but most of the smaller pipes are made of either vitrified clay or cast iron. Originally, portions of the sanitary sewer and storm sewer may have been connected. Structures capable of diverting Camiros. Ltd.lSEH, Inc.lLHDL, Ltd. TeMP Framework Plan Page 6 Chapter II