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Vault. This was accomplished by excavating the old sewer line back past an old sewer <br />manhole, and making a new connection with a 6-inch HDPE pipe. The old concrete <br />manhole structure was removed. The new HDPE sewer pipe was routed to the new <br />Discharge Vault, where it was necessary to core drill a new hole into the structure. The <br />annular space around the HDPE pipe was sealed with a "Link Seal" product. <br />From the Discharge Vault, a new 24-inch HDPE line section extends about 70 <br />feet to connect to the existing mine water discharge line from the old discharge vault. <br />The original plan called for a tee to be installed in the existing line. It was later decided <br />to completely abandon the old system, and install an elbow (instead of a tee) to connect <br />the new Storke pipeline into the existing mine water discharge line. The existing <br />discharge line delivers the mine water into the Tailing Distribution House, where it is then <br />sent to the tailing ponds. <br />The old discharge vault was filled with concrete at the end of the project, The old <br />mine water discharge line, from the #5 Shaft to the old discharge vault, was abandoned <br />and is no longer used for any purpose. It should be noted that it was necessary to <br />remove a section of the old discharge line where the new Storke line crosses the old <br />discharge line near the Storke Portal. <br />An interesting feature of the Discharge Vault is that the end of the 24-inch HDPE <br />pipeline is a vertically oriented, 90-degree elbow. This arrangement keeps the discharge <br />pipeline full of water, and allows any air in the line to escape. This allows the 24-inch <br />HDPE pipeline to be hydrostatically tested without trapping any air in the system. The <br />24-inch gate valve at the pipe discharge is operated from a wheel located on the vault <br />cover. This allows the valve to be opened and closed without entering the new <br />Discharge Vault. <br />24inch HDPE Pipeline <br />The major portion of the Storke Pipeline project is, of course, the pipeline itself. <br />With the exception of some 316 stainless steel piping in the PT, most of the pipeline <br />consisted of approximately 4250 feet of 24-inch O.D. butt-fused HDPE pipe, of varying <br />4 <br />