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The routing of the pipeline required that it extend up to the groin of the dam to a high <br />point, then to drop down to a tailing cutout corridor onto the TSF beach. The purpose of <br />this routing was to allow for the planned growth of 5 Dam during mine operation. This <br />arrangement required the use of an air /vacuum valve at the high point. This valve allows <br />air to vent from the pipeline as required when filling and also allows air to enter the <br />pipeline when draining to prevent possible collapse. The valve is installed in a buried <br />manhole that is heated to prevent freezing. <br />Pipeline Cleaning Systems <br />An important feature of the new 5 Dam Seepwater pipeline is the pigging system. This <br />system is contained in a buried 10- foot -wide by 16 -foot -long by 9- foot -tall concrete vault <br />located near the Mayflower pump station. The vault contains the pig launching device, <br />an electrically- actuated 18 -inch knife gate valve, and miscellaneous equipment such as <br />an electric unit heater, lights, sump pump, etc. The vault can be accessed through two <br />roof hatches. <br />To allow debris to be removed from the pipeline and for recovery of the cleaning pig, a <br />45- degree lateral is installed at the °% way cutout" valve connection. The branch of the <br />lateral daylights at this location and has a 24 -inch blind flange that can be removed to <br />allow the water and debris to flow out of the pipe. <br />Even though a pigging system was installed as part of the pipeline project, it was <br />decided to also include cleanouts on the pipeline. This feature allows for the use of <br />hydro - jetting cleaning methods in addition to the pigging system. The cleanouts are <br />spaced approximately 900 feet apart and are constructed from 24 -inch by 12 -inch HDPE <br />reducing tees, with a 12 -inch riser pipe closed off with 12 -inch blind flanges. <br />Diesel Pump Connection <br />Another feature of the pipeline system is a diesel pump connection tee, located near the <br />south end of the seepage collection ponds. Climax has a floating pump that can be <br />installed in the collection pond and used to pump seepwater into this tee. This pump is <br />available for use if the main Mayflower seepwater pumps are inoperable. <br />