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• 100 <br />Q <br />W <br />J 75 <br />O <br />N <br />N <br />a <br />t- 50 <br />Z <br />w <br />U <br />25 <br />0 <br />M n <br />% <br />% <br />V <br />NC d <br />1 Zn? <br />1 Cu X Fe <br />2 3 4 5 6 7 8 <br />PH <br />FIGURE t HEAVY METAL BEHAVIOR AS A FUNCTION OF PH IN ARGO WATER. <br />6.4.20(7)(e) <br />There are no Designated Chemicals to be used in this operation. Refer to Exhibit C. 6.3.3(2)(a) for a list of non- <br />designated chemicals to be used. There is also a complete collection of MSDS for these chemicals at the end of <br />Exhibit C. There are no exceptional hazards existent for the small quantities stored. The spill cleanup measures <br />• detailed in the individual MSDS shall be followed, but essentially amounts to mopping up with absorbent cloths or <br />medium and flushing with water. <br />To avoid redundancy, the handling methods of potentially acid forming waste rock and/or tailings have been <br />described at length in Exhibit C and above in 6.4.20(6)(a). <br />6.4.20(7)(f) <br />Drainage control within the Tailings Impoundment and Mobile Mill Site Affected Areas has been considered using <br />the U.S. Soil Conservation Service, Technical Release 55: Urban Hydrology for Small Watersheds, USDA (U.S. <br />Department ofAgriculture), .Tune 1986 for design guidance. Additionally, the USDA Natural Resources <br />Conservation Service has published software for analysis of systems covered by the Technical Release 55. Refer to <br />Exhibit C, 6.3.3(2)(c) for a detailed storm flow analysis. <br />The Water Holding Pond and the Tailings Impoundment are to be considered liquid containment systems for process <br />water. The Sediment Collection Pond should not be considered a liquid containment system because this element is <br />part of the stormwater management control system (see Exhibit C for SWMP and peak flow analysis). <br />The average pan evaporation rate exceeds the average precipitation rages in this vicinity (refer to the corresponding <br />climatic data attached as an appendix to this Exhibit T) when considering long tenor water balance. <br />The Water Holding Pond has previously described stormwater diversion measures specified to prevent nor-off from <br />entering (see SWMP in Exhibit Q. A minimum freeboard of 6" shall be maintained in this pond to allow for rapid <br />and potentially severe 100 year type stormwater events. As reported by NOAA (Atlas 2, Vol. I1I), a 100 year/24- <br />hour event yields 3.8" of precipitation. Maintaining 6" of freeboard will provide for safe containment without <br />overflow. Since water is hauled in a frequent manner to this site, the water trick operator will be instructed as to <br />this requirement. Capturing and co-mingling this precipitation with process water from a water right's perspective <br />• has been handled by a Temporary Substitution Water Contract (see Exhibit Q. <br />Page 7 of 31