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Qwest Mail Print Message <br />• <br />Qwest Mail <br />by I Windows Live <br />Page 1 of 4 <br />RE: Bulkhead Design Criteria <br />From: Susan Wyman (swyman@whetstone-associates.com) <br />Sent: Thu 10/25/07 12:01 PM <br />To: 'mark levin' (engmines@hotmail.com) <br />Cc: 'john abet' (jfabel2@comcast.net); 'Steve phillipps' (shep@pmgg.com); 'Steve phillips' (shep_pmgg@mac.com); <br />'amy-thurlkill-{amyahur(kill@cottercc-.com)-;-'Scott Effner' (seffner@whetstone-assoeiates:eom)------- <br />Hi Mark, <br />started an a-mail to you yesterday, but did not get it sent. We have evaluated the refilling hydrology using <br />several methods, and have concluded that the water level will not rise to the Steve level as a result of deep <br />groundwater inflow (from bedrock). However, the bulkhead is a prudent measure in the event that water from the <br />upper workings temporarily pools in the Steve Level during and after the rainy season in very wet years. <br />A low pressure bulkhead will be adequate. <br />We are in the process of writing up the hydrologeologicanatysis. Please call to discuss, if you have questions. <br />Regards, <br />Susan <br />From: mark levin [mailto:engmines@hotmail.com] <br />Sent: Thursday, October 25, 2007 10:36 AM <br />To: swyman@whetstone-associates.com <br />Cc: john abet; Steve phillipps; Steve phillips; amy thurlkill <br />. Subject: RE: Bulkhead Design Criteria <br />Hi Susan: <br />Just checking in -when do you think you might have an estimate of the post-bulkheading mine <br />pool elevation? <br />Thanks, <br />Mark Levin <br />Mining & Environmental Services LLC <br />303.567.4174 <br />From: swyman@whetstone-associates.com <br />To: engmines@hotmail.com <br />Subject: RE: Bulkhead Design Criteria <br />Date: Tue, 2 Oct 2007 06:31:42 -0600 <br />Hi Mark, <br />Thanks for your a-mail. I'm working out in the field on Monday and Tuesday of this week, but will <br />call you on Wednesday to discuss the Schwartzwalder bulkheading. <br />Also, can you give me the general elevation (or location) of the Sunshine adit? I have detailed <br />drawings of the underground workings, but don't recall that level. I'll try to be more knowledgable <br />when we talk on Wednesday. <br />Regards, <br />http:/lb1109w.blu 109.mail.live.com/mail/PrintShell.aspx?type=message&cpids=46c85040-... 3/16/2008 <br />