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su"•'°°• "° so. ~""'°° etia. Northern <br />~~`=~. P. O. Bm 17Fi63. T.min.l Ame: Coal <br />o.~..r, caor.ao sozv <br />~' T.kororc 3oaasa.aeoo Company <br />January 6, 1981 <br />Mr. Jim Herron <br />Colorado Mined Land Reclamation <br />723 Centennial Building <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />RE: Rienau No. 2 Mine - Crossing Under Curtis Creek <br />Dear Mr. Herron: <br />On Wednesday, December 31, 1980, Terry Schulz and I met with you, <br />Mr. Pendleton and Mr. Cox concerning the protective measures and <br />monitoring that Northern will engage in while crossing under <br />Curtis Creek. As a result of that meeting, we came away with an <br />understanding about certain issues which will be addressed in <br />addition to those mentioned in our December 11, 1980 letter. <br />Those points are as follows: <br />1. Additional subsidence monitoring points. As you pointed <br />out, it would be helpful in the event of subsidence to have points <br />in addition to those directly ovei the main entries. In order to <br />accomplish this, we will place six more monitoring points as <br />located on the attached map. These points are within the area of <br />influence and should reflect any change in elevation. Each co- <br />ordinate and elevation will be forwarded as soon as survey work is <br />finished. <br />2. Quarterly monitoring of subsidence points. We will monitor <br />the subsidence points quarterly and forward the elevation information <br />to you for your review. We would propose that this monitoring con- <br />tinue for one year on a quarterly basis and yearly after that. <br />3. Minimum of 2 weeks surface flow data on Curtis Creek. As <br />was suggested at the meeting, we will have a minimum of 2 weeks <br />surface flow data on Curtis Creek prior to mining under the creek. <br />Also the flumes which have been installed will be equipped with the <br />WATEC design de-icer so as to allov a free flow for measurement pur- <br />poses. The flumes will also be checked regularly for ice build-up. <br />4. Copies of drum charts and reduced data. We will forward'to <br />you for your review a copy of the drum charts as well as reduced data <br />on the Curtis Creek flow. <br />5. Surface owners' agreemeat. As we related to you on December <br />~~r 11th, we are still pursuing an agreement with the surface owner so that <br />we may have access to monitor the ground water wells in the vicinity. <br />We vill keep you advised of any developments along this line. <br />