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the containment, the actual volume of containment is 5079 — 200 = 4879 cu. ft, which is 111% of <br />the tank volume. <br />In the case of a rupture of the thickener tank or piping, a slurry pump will be located at the low <br />I <br />point of the thickener containment, which would then pump the slurry back to the 18000 gallon <br />tailings tank located in the filter building. In this way, no tailings will be allowed to leave the <br />area, although by the time that the tailings enter the thicken I they will be inert anyway. <br />Therefore, with this system, there is actually triple containment of the tailings slurry at the <br />thickener. These are 1) the tank itself, 2) the concrete secondary containment and 3) the sediment <br />pond capture system. <br />The slurry will be transported from the filter building to the thickener by overhead HDPE <br />process water line of 8" diameter. A Return slurry line for concentrated slurry and a return water <br />I <br />line will also be installed on the bridge. The bridge will cons i ist of a steel truss structure of 6 feet <br />width and 100 feet long. An air line and electric cable will also be suspended in the same bridge. <br />The bridge will be 18 feet high to allow clearance and all support structures are shown on Map <br />TH -1. As seen on this Map, there will be two support structures; one at the filter building end of <br />the overhead truss and the other at the thickener end, and the distance between them is 100 feet. <br />The truss supports at both ends will be steel supports in a foundation which is separate from both <br />I <br />the thickener and the filter building, as shown on the revised TH drawings. <br />It is understood that a qualified Professional Engineer will certify the construction of the <br />Thickener, the bridge and the concrete apron and will provide a certified report after the <br />construction is complete, which will be submitted to the Division. <br />I <br />Since the thickener and pipe bridge structure will be removed for reclamation, there is a bond <br />increase, which is included in the revised Exhibit L. <br />Item 2 - Inclusion of Concrete Anron. Trough. Sumn and Puma in front of Filter Building <br />As of December 2014, there are four large garage doors in;the filter building. The two in the <br />middle are where the tailings from the filter presses drop down and are loaded with the small <br />