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d ~^ ; . <br />The first is that when gathering field data enough samples must be <br />taken to demonstrate sample adequacy at the 90$ confidence level. <br />The equation for calculating this demonstration is in the <br />"Guidelines for Compliance with Land Use and Vegetation <br />Requirements". <br />The second is that the cover and production will be acceptable if <br />the reclaimed area is not less than 90$ of the standard or <br />reference area with 90$ statistical confidence. This second <br />demonstration is included in the application narrative, however, <br />the accompanying explanation of how it is to be used is not clear. <br />Both of these areas are going to become very important when the <br />operator applies for bond release. Recently the Division has sent <br />out a draft bond release guideline that is going to require <br />operators to submit to the Division a plan that clearly defines how <br />vegetation sampling will be conducted at various bond release <br />phases. There has been some confusion about this in the past and <br />this new guideline should clear that up. Given this eventual change <br />the Keenesburg Mine should go ahead and submit a Technical Revision <br />to the Division that addresses the previously mentioned items and <br />also clarifies the whole bond release sampling scenario. Prior to <br />submitting this revision I would be happy to meet with mine <br />representatives to discuss what needs to be included in the <br />revision. Also, once the revision is received I would be available <br />to review it. <br />If you have any questions, please see me. <br />AJW/ajw <br />cc: Dave Berry <br />