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• 2.0 AS-BUILT TOPOGRAPHY The evaporation system was built according to the intent of the design report. The procedures outlined in the construction specifications (BMRI, 1999) were followed for design modification during construction. The total lined azea of the holding pond and evaporation azea is approximately 9.9 acres. 2.1 Holding Pond Embankment The embankment of the holding pond was constmcted according to the specifications presented in the design report. The embankment has a top width of 10 feet and will serve as an access road for maintenance vehicles. Compaction testing of fill placed in the embankment is discussed in Section 4.1. The side slopes for the upstream and downstream sides of the embankment were designed to be not steeper than 3H:1V and 2H:1V, respectively. The as-built slopes of the embankment aze approximately 4.SH:1V or flatter for the upstream side and 3.SH:1V or flatter for the downstream side. The as-built embankment crest elevation is nominally 8608 feet, as • designed. The lowest point of the embankment, based on the as-built survey, was 8,607.4 feet. 2.2 Holding Pond The bottom and top elevations of the holding pond aze nominally 8600 feet and 8608 feet, respectively. The embankment forms the exterior wall of the pond, while the interior wall is excavated into the evaporation area. The total storage capacity of the pond is approximately 3.1 million gallons to the lowest embankment crest elevation. The operating pond volume, leaving one-half foot of elevation for freeboazd, is approximately 2.7 million gallons. 2.3 Evaporation Area The evaporation area is approximately 7.4 acres, with a variable width of 300 to 500 feet and an overall bottom slope of approximately 1.6 percent. The constructed area provides a lined surface to collect over-spray and enhance evaporation. Placement and compaction of fill to create the foundation of this azea is discussed in Section 4.1 • Battle Mountain Resources, /nc. L Augusi 10. 1999