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. J1 .."\ r. ,... "tuU\J c. Impacts Associated with the Three Methods of Constructing Granite Siphon The most economical method of constructing the Granite Siphon is cut and cover construction of a buried conduit (Plan A). This would require vegetative clearing for the entire length of the siphon possibly up to 100 feet in width. No access road construction would be permitted, and the contractor could use the Granite Adit construction campsite for his construction camp. All topsoil could be stockpiled and spread over the area excavated for construction of the conduit to facilitate revege- tation of the area. Trees and native or adapted grasses could be used to revegetate the entire disturbed area. . Another method of constructing the siphon is to construct a slant drilled hole and tunnel on each side of the valley and a buried conduit across the bottom of the Fryingpan River Valley (Plan B). This construction would require clearing of up to 100 feet in width for construction of buried conduit and the tunnel portal areas and partial clearing for possibly 20 to 50 feet in width for construction of a tramway or other type of access from Granite Adit to Granite Diversion. This construction would require an area for tunnel muck disposal. A waste water treatment system at tunnel portals would be provided if water is encountered in the very short tunnels. All of the cleared areas except the tunnel muck disposal areas could be revegetated with trees and native or adapted grasses within a relatively ,short period of time. Topsoil would be placed on the tunnel muck disposal areas to facilitate revege- tation. This is the most expensive method of constructing the siphon and is about 270 percent of the cost of the cut and cover burial conduit method of construction. The third method to construct the siphon is to construct a slant drilled hole and tunnel on the south side of the Fryingpan River Valley and cut and cover conduit across the bottom and the north side of the river valley (Plan C). This construction would require clearing of up to 100 feet in width for construction of the buried conduit and the tunnel portal areas and partial clearing for possibly 20 to 50 feet in width for construction of a tramway or other type of access from Granite Adit to Granite Diversion. This construction would require an area for tunnel muck disposal. A waste water treatment system would be provided near the tunnel portal if needed. All of the cleared areas could be revegetated with . IX-38