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1. As discussed previously, the ventilation design must address "T -Split" <br />ventilation to effectively ventilate the longwall face. This may require <br />significant modifications to the ground support systems. <br />2. The shapes and sizes of pillars must either be designed to meet ALPS and <br />ARMPS stability factors, or justification for using lower stability factors <br />must be presented and found acceptable by MSHA. <br />If you have any questions or if you would like to meet and discuss this matter, please <br />contact Sid Hansen at 303-231-5590. <br />Sincerely, <br />Russell J. Riley <br />District Manager <br />Enclosure <br />cc: Adam Patterson <br />