_INSPECTION - C1981015 (15) - Laserfiche WebLink

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III. COMMENTS - COMPLIANCE Below are comments on the inspection. The comments include discussion of observations made during the inspection. Comments also describe any enforcement actions taken during the inspection and the facts or evidence supporting the enforcement action. This was a complete quarterly inspection of the reclaimed Fruita mine permit revocation site, conducted by Dan Mathews of the DRMS Grand Junction Field Office. A remedial reclamation project was performed at the site earlier this spring. The Division's Inactive Mine Program (IMP) developed the maintenance plan and bid documents for the project, utilizing a combination of remaining forfeited bond funds and a grant from the OSM civil penalties fund. The construction contractor performed the work in March-early April. Project tasks completed included: • Repairs to the central Mine #1 portal entry, where a cavity had formed within the backfill, out- by the concrete portal seal, resulting in small openings to the surface and drainage of surface runoff into the cavity. This problem was addressed by filling the outer portion of the cavity with polyurethane foam to seal the opening off from the surface, followed by replacement of backfill and a protective rock apron over the hardened foam. • Repair of a gully on the #1 portal backfill downgradient of the rock apron, including channel shaping and installation of a series of closely spaced keyed rock checks. • Repair of a large gully that had formed at the toe of the steep riprap channel that extends down the outslope of the #1 Mine bench. Repair included channel shaping and installation of large riprap along the segment of channel immediately downstream of the toe of the outslope, as well as channel grading and installation of rock checks downstream of the new riprapped section. • Gully repair including riprap and/or rock check installation in a number additional locations, including a segment of the "west fork" channel west of the #2 Portals backfill, along the lower east perimeter of the #1 mine bench outslope, along a segment of the main drainage channel upstream of the sediment pond, and along the lower segment of the reclaimed Mine #1 bench access road. • Sealing of the damaged CMP primary pond spillway, removal of the primary spillway riser and associated structure, lowering of the open channel spillway and installation of riprap within the spillway and within a channel from the spillway to the natural drainage channel below. • Roughening, seeding, and mulching of all areas disturbed during the remedial project. • Removal of tamarisk plants from the sediment pond. A follow-up project is scheduled for this fall, to include roughening and seeding the smoothly graded #2 portal backfill where seeded vegetation did not establish well, along with remedial seeding of other areas if warranted, and erosion repairs as necessary. Weather was cloudy and warm. The sediment pond contained no water; pond bottom was dry. 3