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3.2.3 Drain Outlets <br />As previously described, the facility is underlain by a geomembrane liner and sub - drainage <br />collection system. Water from the free -water pool (plus any net infiltration from direct <br />precipitation on the surface of the impoundment area) infiltrates the tailing, is intercepted by the <br />impoundment liner and is drained off via the granular subdrain and a network of perforated <br />collector pipes, which are routed under the dam to three outfalls at the downstream toe of the <br />dam. The sub -drain outfall pipes do not collect surface water from the impoundment directly. <br />On Site Visits 1 and 2, the sub -drain pipe outfalls were covered by sediment. Seepage was <br />observed emanating from the embankment slope approximately 5 feet vertically directly above <br />the pipes, and in the surrounding outlet area. The outlet area as it appeared during Site Visit 2 is <br />depicted in Figure 8. <br />A <br />Figure 8 Site Visit 2, Sub -Drain Outlet Area Prior to <br />Uncovering, Looking Downstream from Above Outlet <br />San Luis Project Miller Geotechnical Consultants <br />Tailing Dam Data Report 14 February 2014 <br />