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Memo, October 25, 2001 <br />Page 3 of 3 Pages <br />would then validate the hypothesis as mining approached the reservoir area. <br />The subsidence and seismic program submitted in revised page 2.05-113 needs to be developed <br />in more detail, to address all the requirement s of Rule 2.05.6(6), for our review and approval. <br />Subsidence monitoring station transects need to extend from azeas of collapse, through the zone <br />of transition, onto unaffected azeas to demonstrate subsidence phenomenon of the mining <br />activity. Stations need to be of a lineaz density to measure surface vertical and horizontal <br />displacement over successive and last panels. <br />Please see me if you have any questions. <br />Cc: Dan Hernandez <br />Sandy Brown <br />