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• Remediation Project Evaluation Scope, Methodology, Assumptions <br />and Followup Recoamendations <br />1. General Scope: <br />Sunnyside Gold has performed a reconnaissance level study of <br />the Upper Animas area to target potential zemediation sites. <br />In order to rate projects, simplifying assumptions were made <br />for each category of project. These pzoject categori~as are; <br />a. Adit Flow Diversions from Dumps <br />b. Portal Bulkheads or Constructed Wetlands <br />c. Best Management Practice (BMP) Projects (i.e. cover or <br />remove tailings and dumps to minimize contact with water) <br />2. Loading Evaluation Methodology and Assumptions: <br />a. Adit Flow Diversions <br />Methodology: <br />- Water samples were taken at the portal and below the <br />dump. <br />- Analysis was for a combination of total and <br />dissolved metals. Except for one site, comparisons <br />were made using the same type of analysis. <br />. - Water quality above and below the dump was <:ompared <br />for improvement or degradation. <br />Assumptions: <br />- Flow leaving the portal equaled the surf<~ce flow <br />exiting the site. <br />- Precipitate being deposited stays on or within the <br />dump. <br />- Goading from project(s) where degradation is <br />occurring will be based on average flow from best <br />available data. <br />- Projects are feasible from an ownership and <br />liability standpoint. <br />b. Portal Bulkheads or Constructed Wetlands <br />Methodology: <br />- Sample data was collected from CDH Upper Animas <br />Study and SGC sampling. <br />- Average loading values were determined from <br />available data. <br />- A short list was made by eliminating any sites with <br />Zn concentration (BAT limits or ZN lo~~ding (4 <br />lb/day. <br /> <br />- 5 - <br />