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J I ~ • • <br />J.E. Stover & Associates -36- May 31, 1996 <br />Bowie No. 2 Mine <br />of the perennial springs and all surface runoff is appropriated. <br />Potential disruption of any of the water sources requires a plan <br />for augmentation approved by the water court. The experience of <br />the Mount Gunnison No. 1 mine presents precedent for the <br />resolution of these concerns. <br />2.4 BUILDINGS AND STRUCTURES <br />The preparer did not address stock watering ponds within this <br />section. The Division interprets 'structures' to include any and <br />all manmade structures, including water management devices, such <br />as ponds and irrigation ditches. The application contains <br />mitigation plans for the watering ponds. This deficiency can be <br />easily solved by including a brief discussion of stock watering <br />ponds and mitigative methods. <br />2.5 LANDSLIDES <br />As discussed under other geotechnical topics, the Division <br />believes the existence of historic and modern landslides within <br />the permit area constitutes a significant geotechnical concern <br />for the proposed Bowie #2 mine's operation and reclamation plan. <br />The preparer is correct in observing that no specific criteria <br />are available for the delineation of specific subsidence-related <br />landslide hazard increase. This topic is better addressed under <br />the specific sections relating to stability of the operating <br />facilities, such as roads and portal benches, and the reclamation <br />plan. <br />The Division does believe it would be appropriate to visually <br />inspect known historic and modern landslides, during the periods <br />immediately following retreat extraction in their immediate <br />proximity. The applicant should propose a detailed inspection <br />methodology to detect subsidence cracking or rejuvenation of <br />movement to the potentially effected landslides. This should <br />include inspection immediately following the annual ground water <br />high stand of late June, during which the majority of landslide <br />movement normally occurs. These inspections should be conducted <br />annually in areas undermined far an appropriate period of time <br />following retreat extraction, to verify negative impact from <br />subsidence. <br />4.0 CONCLUSIONS AND RECOMMENDATIONS <br />Many of the preceding comments also apply to the reiterated <br />statements included by the preparer of Exhibit 15 within this <br />summary section of the report. <br />SUBSIDENCE HANDBOOK <br />