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-.. `%; <br />.. <br />` \,. <br />~\~i ' ':. <br />~ ~ `.' , <br />~• <br />,~ <br />i ~f:' <br />.e <br />a <br />., . ,; i~~~ l tu~i <br /> <br />because we CULL 'it would be ndvanta~;eous to hnvc inf~rmntion <br />as to effects of. subsidence on advance mining under the Creek. <br />tJe felt chat this .information would be va]uable to Nor[};crn . <br />later in Che approval process when we were seeking permission <br />to advance and retreat mine in the Creek area further to the <br />north. As we stated earlier, ehesc plans have been changed, <br />significantly and tae no longer feel that this data will be "~ <br />valuable to either the State or to Northern. Northern has ~_ <br />~•alcaays maintained with the Division staff that advance mining <br />will cause no subsidence. Retreat mining that •.~ill be done by <br />loogcaall panelling has been designed using a very conservative <br />30 angle of draw in relation to Curtis Creelc. Therefore, the <br />~ retreat mining should cause no subsidence in the Curtis Creek <br />~` ~ ~ area. If we i ntended to retreat mine within the Creek area, _ <br /> then it might be reasonable to monitor for s ubsidence. In view <br />t\ of our change in plans, we are requesting th at Stipulation 5 of <br />~~~.~ ~ ,the August 11, 1981 approval be modified to eliminate tF.e addi <br /> tional monitor <br />I ing points over the second and third east entries. <br />/' <br />~ i ~ <br />~ <br />~ Sincerely, <br />~ <br />i <br />~~ NORTHERN COAL CO`1PAP:1' <br /> // - ~/ <br /> /_/ <br /> Diane L. Geyer G <br /> Environmental Compliance Specialist <br />cc: Jerry h1cPhee <br />Troy 1Ji11s <br />I , <br />TD'S ____ ... .__. <br />