Laserfiche WebLink
<br />• <br />As a part of normal mill operations, mill process water will be continuously monitored. A pH monitor and data <br />recorder will be installed at the tailings pump location within the mill. Should the pH reach a state outside of the <br />7.5-9 range that is necessary to precipitate the heavy metals, alarm notification will be activated for the operations <br />personnel. Recorded data is saved in 30 day increments available for future audit The submittal notes on this <br />Serfilco Model 432 monitor/recorder can be found attached in Exhibit C. <br />If the pH falls outside of the 7.5-9 range, the operators are instructed to shut down the operation that delivers waste <br />to the impoundment. Once the source of the problem is corrected upstream in the process, waste can then be <br />continued to be discharged to the impoundment. <br />It is practically impossible for heavy metals to be in solution under these operating conditions (pH range of 7.5-9) as <br />shown in the attached A Water Handbook for Metal Mining Operations, by Thomas R. Wildeman (see Exhibit Q. <br />On page 13 (of the same), Figure 1 shows the effect of raising the pH of this effluent water to 7-8. The method <br />employed in Venture Resources' processing plant has the identical beneficial effect as shown in this Figure 1. This <br />has also been verified by the Company and is evidenced by the waste stream lab sample results. <br />100 <br />0 <br />W <br />0 75 <br />N <br />V) <br />0 <br />1-50 <br />Z <br />W <br />U <br />d 25 <br />1 <br />', M n <br />1 ??\ <br />% <br />1 ? <br />1 ?. <br />1 ? <br />1 C d <br />1 ? <br />1 Zn\ <br />1 ? <br />1 Cu Fe `? <br />pH <br />• <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 have been described at length in <br />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 Hydrologyfor Small Watersheds, USDA(U.S. <br />Department of Agriculture), June 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. <br />Refer to Exhibit C, 633(2)(c) for a detailed analysis.