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I I I I I I I I I I I I I I I I I I I o PVC pipe has the serious disadvantage of not being available for the hi gh pressure servi ce requi red in much of the Towaoc water line. As with Permastran, PVC could be used in areas wi th corrosi ve soi 1 s (although these areas wou1 d be 1 imi ted to places where working pressures plus water hammer pressures are less than 235 psi). There exists the potential of mixing pve and Permastran to provide an entire non-corrosive line. o Prestressed concrete cylinder pipe is an acceptable pipe. It requires very detailed alignment data and designs to allow custom fabri cati on to meet fi el d condi ti ons. Prestressed concrete cylinder pipe is considered by many engineering organizations to be the most desirable type of pipe, it provides an extremely good joint system utilizing a be11-and- spigot machined to exact dimensions. Thrust restraint is easily obtained by welding the steel be11-and-spigot. 3.6 Geology The Cortez- Towaoc pi pel i ne route 1 i es on the northern fl ank of the Mesa Verde Basi n, a broad syncl i ne centere<:l about 15 mil es southeast of Towaoc. The di p of the rocks along the route is generally south to southeast at about two degrees or less. From the head of the line south to about Highway 160 the herlrock is sandstone of the Oakota Formation. The Oakota is Cretaceous in age, and is generally yellowish-brown to gray quartzitic thick bedded sandstone. Within the formation are beds of shale, siltstone, and thin limestone. A swamp found in Secti on 19, west of Totten Reservoi r, obscures the Oakota, a1 though several small hil 1 s on the eastern edge of the swamp are supported by thi n 1 imestone beds of the formation. lJownstreal'l of Highway 160, in Sections 30 and 31, the Oakota is covered by a thick mantle of loam along McElmo \~ash and the right side of Rocky Ford 3-24 l060c