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Page 1 of 1 <br />Means, Russ <br />From: Keffelew, Berhan <br />Sent: Monday, November 05, 2007 8:03 AM <br />To: Means, Russ; Sorenson, Allen <br />Subject: RE: Whirlwind Mine <br />Gentlemen <br />I read Allen's review regarding ore pad construction & Surface Water Management. I am sorry to say, I have not read the <br />entire permit application other than a cursory review because it is being reviewed by my esteem colleagues. <br />Regarding the 12 inch soil liner fill placemat, I am sure Allen will agree that for similar compaction and thickness, at <br />CC&V, ASTM D698 WAS UTILIZED AND SAMPLING FREQUENCY WAS SET AT 5,000 CY, I ALSO SUGGEST IF IT IS <br />NOT SET ALREADY DRMS set particle size distributions (ASTM C117,C136, D1140) or for description and identification <br />(ASTM D2488) OR whatever, Allen feels appropriate be utilized. Sample frequency should be very 5,000CY. Attenberg <br />Limit (ASTM D4318) SAMPLING FREQUENCY 5000CY, MOISTURE CONTENT (ASTM D2216) SAMPLING <br />FREQUENCY 5000Y, PERMEABILITY IN ACCORDANCE WITH (ASTMD5084/2434 FREQUENCY EVRY S,000CY... <br />Nuclear Density every 500 CY. <br />I also suggest no frozen soil liner fill material be used as liner fill. Placement of the soil liner should have a temperature <br />limitations, like we did at CC&V These were the standards utilized at CC&V AS A DMO operation. Preparation of the <br />native area should also be a major consideration prior to placement of the soil liner fill, it has to be reasonably smooth and <br />void of large protruding rocks and objects. <br />The diversion structures proposed are similar to the ones approved at CC&V to divert water away from the valley leach <br />faculty. Just a thought <br />From: Sorenson, Allen <br />Sent: Friday, November 02, 2007 6:12 PM <br />To: Means, Russ <br />Cc: Mount, Carl; Keffelew, Berhan; Pickford, Kate; Bird, David <br />Subject: Whirlwind Mine <br />11 /5/2007 <br />