Laserfiche WebLink
b) In Section 3.2 of the 2001 AHR, Comparison of Projected Impacts with Observed <br />Impacts, there is brief summary discussion of the projected and observed subsidence <br />effects of longwall mining beneath Red Wash. Monitored areas of Red Wash were <br />mined in the 1980's. The PHC section of the permit also discusses impacts to Red <br />Wash and projected subsidence impacts of longwall mining beneath Scullion Gulch, <br />and stock ponds located along Scullion. During the 2000/2001 water yeaz, longwall <br />mining was initiated beneath Scullion Gulch and Raven Park Reservoir (a normally dry <br />stock pond on the gulch), via Panel LW-Bl. Daily visual monitoring was required for a <br />period of time during and immediately following undermining, and several subsidence <br />cracks were observed on top of the earthen dam of Raven Park Reservoir. Please <br />amend appropriate sections of the 2001 AHR and the PHC section of the permit <br />application to include a discussion of anticipated and observed impacts of longwall <br />mining beneath Scullion Gulch and Raven Park Reservoir. In addition, please <br />amend the 2001 Annual Subsidence Report and Subsidence Imgact sections of the <br />permit application to describe the daily visual monitoring and observed <br />subsidence effects on Scullion Gulch (or reference 2001 AHR and PHC sections as <br />appropriate). <br />c) PHC projections are that mine inflows would average 5-10 gpm. Recent AHR's have <br />reported inflows as "insignificant", with no quantification. Please amend the <br />hydrologic monitoring plan section of the permit application to include a method <br />for quantification and annual reporting of inflow rates, to document compliance <br />with PHC projections. <br />IV. BONDING <br />The Division has reviewed the adequacy of the reclamation bonding instruments, and we have also <br />reviewed the adequacy of the worst case reclamation cost estimate. <br />The current bond document held by the Division for the Deserado Mine is Corporate Surety Bond <br />No. issued by_National Union Fire Insurance Company of Pittsburgh, PA. The original <br />bond, for $7,000,000.00, was accepted by the Division and signed by the Director on August 6, <br />1997. Subsequent riders to Bond No. have. increased the surety amount held by the <br />Division to $7,125,000.00. The most recent bond rider was accepted by the Division and signed by <br />the Director on October 15, 1999. The bonding instrument has been found by the Division to meet <br />all applicable requirements of the Act and Regulations. <br />A required bond amount of $5,052, 786.00 was fixed on June 5, 2000, by approval of the current <br />five yeaz renewal permit. The Division had prepazed a detailed cost estimate in conjunction with <br />issuance of the proposed decision for the renewal, on April 20, 2000. The renewal decision <br />included a reduction in the required bond amount, based on re-evaluation of the worst case cost of <br />Deserado Mine Apri130, 2002 <br />17 <br />