APPCOR12376 - Laserfiche WebLink

Home Browse Search

_l7_ 5. The subsidence monitoring prog[am presented within the application proposes to survey monitoring subsidence grid networks. These installations are acceptable as proposed. The applicant also proposes to survey the one identified dwelling within the potential area of subsidence affects. In addition, however, the applicant will be requited to conduct periodic visual monitoring of features such as County Road No. 27 and the Denver, Rio Grande and Western Railroad Spur. 6. The applicant observes that severe winter weather conditions make quarterly monitoring undesirable and a proposal to monitor semi-annually is included within the application. The justification is inadequate to allow approval of this variance request. In particular, the monument sets installed above the main entries in the vicinity of Foidel Creek could be locatible during winter conditions Sf appropriate markers were installed. Admittedly, access to the ridge top monitoring sets above the production panel selected for monitoring might be extremely difficult during winter periods. 7. The subsidence survey report format proposed within Exhibit 11 of the application is acceptable. However, the applicant proposes a report submittal frequency of once per year, rather than the regulatory requirement of semi-annual submissions. This report must be submitted semi-annually. In fact, several operators within Colorado have proposed data collection frequencies far higher than the regulatory requirements, Sn order to accomplish specific observations of subsidence response versus time, etc. %VIII Concurrent Surface and Underground Mininc and Variances from Contemporaneous Delav (2.06.7. 4.22). The applicant correctly observes that a variance from contemporaneous reclamation of the final pit at the Energy No. 1 mine was granted previously as a portion of approved Permit No. 79-177. An increase in the variance area is requested by the applicant, in order to permit development of the Foidel Creek underground mine's portals and the associated surface facilities. In addition, the applicant intends to modify the existing highwall and spoils elope configurations within the pit, in order to increase their slope stability. The applicant intends to utilize the excavated spoil and highway materials to construct a temporary berm, upon which surface support facilities will be constructed. Exhibit B of the amended permit application and Mape No. 3, No. 5 and No. 15 depict the applicant`s plan to reconfigure the portal area. The information submitted is adequate in moat respects to