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May Day /Idaho Mine — Comments to Selected Work Plans from the August 2011 Submittal, <br />Exhibit D <br />Page 4 <br />August 22, 2011 <br />and any resulting changes or additional details to the augmentation pond design be <br />submitted as a technical revision. <br />16. Page 3, Construction. Item 9 states "No topsoil is available on site ". Based on the June <br />2, 2011 site visit, there appears to be a significant amount of growth media in the area of <br />the proposed augmentation pond. Please re- evaluate this statement. <br />17. Page 4, Construction. Item 13 states "The pond will be constructed in accordance with <br />the design specifications summarized in Attachment D -6 and Figure D -1." There are no <br />design specifications in either Figure D -1 or Figure D -2. Please include the subject <br />design specifications. <br />18. Page 4, Construction. Item 15 discusses the proposed gravity and pressurized HDPE <br />pipelines will be in a trench not less than 18 inches deep. DRMS is concerned with both <br />the gravity and pressure lines freezing during the winter and causing the pipe to rupture. <br />This would lead to unintended subsurface discharges, possibly impacting the hydrologic <br />balance and /or stability of roads and slopes in the vicinity of the pipeline. Please provide <br />some discussion on precautions to be taken to prevent pipe freezing. Include an estimate <br />of frost depth in the area. <br />19. Page 6, Reporting. The last bullet indicates "as- built" drawings will be prepared in the <br />third quarter of 2011. DRMS recommends this statement be revised such that the <br />schedule is tied to the date site access might be granted and seasonal limitations related to <br />field and construction work. <br />If either you or the applicants have any questions regarding the comments above, please call me <br />at (303) 866 -3567, extension 8169. <br />c: \documents and settings\sssUocal settings \temporary internet files \content.outlook \a5ghsruj \exhd - <br />selectworkplancomments mem22augl1.docx <br />