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Natural Gas System When construction began in the early I 940s, a 12-inch diameter natural gas pipeline was constructed from Minneapolis to TCAAP. The alignment of this pipeline rougWy paralleled the dual sanitary sewer force mains installed at the same time. Natural gas was used for fIring boilers that heated the buildings with steam. In addition, natural gas was piped in process lines to the buildings. The gas mains were kept in good condition by the use of cathodic protection. In 1991, NSP extended a 6-incb diameter natural gas main to the site, and the old 12-inch line was abandoned. This six-inch main was extended to the site from the south and runs along the north side of Highway 10. It enters the site south of Building 105. Only a few of the buildings are still served by active gas mains. For safety reasons, many of the gas mains on site have been abandoned. Gas main abandonment typically consists of "purging" the pipe with nitrogen, removing valves and connections, and welding caps on all open ends of the pipe. Abandoned gas mains are generally left in place, but some lines leading into TCAAP have been removed. 5. Transportation System Internal to TCAAP The internal transportation system consists of paved and unpaved roadways, trails, parking lots and railroad spurs (Figure 6). TCAAP contains about 55 miles of bituminous paved roads and many more miles of gravel roads. Most of the paved surfaces are located along the western and southern sides of the site. The roads and parking lots are in fair to good condition due to the Army's regular maintenance program. There is one bridge on the site, which also serves as a dam on Patrol Road where it crosses Marsden Lake. Roadway access to the site is available from the south (Hamline at CSAH 96), west (US Highway 10 or CR H), or north (what is now called Mounds View Road on-site). Currently, however, access is restricted to the main entrance from Highway 10, except in special situations. TCAAP contains a fairly extensive rail network. During peak production, the railroad was heavily used. As highway access to the site improved, rail service declined. Today, much of the track is in poor condition due to limited use and maintenance in recent years. External to TCAAP TCAAP is well-served by regional roadways, including Interstate 35W, US Highway 10. and County Highway 96. The condition and status of these roads may be important to the site's future: . Interstate 35W has been removed from the state's replacement program. Should the highway need to be upgraded"" e.g., by altering interchanges or widening pavement"" the responsibility for funding the improvements may fall to the surrounding cities. . US Highway 10 is the subject of a jurisdiction study that may turn the section adjacent to TCAAP back to Ramsey County for maintenance and upgrading. . Highway 96 is already slated to be upgraded in the next few years. One item of discussion is the possibility for converting the US 10/96 intersection into a grade-separated intercbange. Such a reconfiguration would undoubtedly affect access to TCAAP. Camiros, Ltd.lSEH, Inc.lLHDL. Ltd. TCAAP Framework Plan Page 11 Chapter II I J I I I I I I I .. I I I I I I .1 I I