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NIID-CONTINENT RESOURCES, INC. <br /> 201 Centennial St..Suite 406 <br /> Glcmwoaj Springs. Colorado 81601 <br /> 003)948-4954 <br /> January 29 , 1986 <br /> Pis . Candace M. Thompson <br /> Mined Land Reclamation Division <br /> 1313 Sherman Street , Room 423 <br /> Denver , CO 80203 <br /> RE : Technical Revision for Suspension of Subsidence Monitoring ; <br /> C-81-017 <br /> Dear Candace : <br /> onzinent agrees to the following conditions that PiLRD <br /> proposes with the approval of the subject technical revision: <br /> (1) If any unanticipated surface disturbance (Cracking , <br /> cratering or landsliding) manifests itself within the area <br /> potentially affected by subsidence (angle of draw = 20 . 5 degrees) , <br /> the operator will be required to immediately reinstitute the <br /> subsidence monitoring program. <br /> (2) All existing monuments must be left in place and <br /> maintained . <br /> (3) All existing monuments must be resurveyed at the <br /> conclusion of the current five year permit period , to determine <br /> whether additional subsidence manifests itself . <br /> (4) A subsidence monitoring program will be required above <br /> any double-pass longwall operations , in order to determine the <br /> ultimate subsidence factor above that relatively untested <br /> extraction technique . <br /> Sincerely , <br /> Ge E . Wear <br /> Director , Special Projects <br /> GEW: rm <br />