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to various locations on site for use as substitute topsoil in the reclamation. <br />3. Pond Linine <br />The channel from the culvert location and Gold Pond 2 were checked to determine the <br />impermeable nature of the clay lining. Excavations of the pond showed that the fine clays <br />were adequate to provide an impermeable lining to prevent the pond water from leaking <br />into the underlying bank material, which is composed of gravel, sand, silt and clay in <br />varying proportions. A static water test was conducted after the inspections of the clay <br />were made. The drawdown was equivalent to evaporation. In any case, the underlying <br />material has the potential for seepage. In order to ensure that seepage does not occur, it is <br />required that at least 2.0 feet of compacted fine material be present at all times in the <br />channel downstream of the 18" CMP, and Gold Ponds 2 and 3. <br />See the revised Map C-4 for the plan view of the system and the pond layout. <br />It is again noted that additional safety facfors will further ensure that the chemical poses <br />no risk to waters downstream. These are: a) the chemical Anionic Emulsion Flocculent AE <br />852 is safe, as supported by the MSDS sheets enclosed as well as the information <br />provided by HyChem and b) since all of the gold ponds are above Pond A, any seepage <br />that could occur would end up in Pond A, which has an engineered seal, c) the chemical <br />attaches to the suspended solids and is removed from the water stream in the process and <br />d) the 500 gallon tank and any stored flocculent will be protected from leaving the <br />building in concentrated form by a secondary containment in the storage building itself. <br />8/7/06 Addendum to Sediment Control System Page 3 <br />