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C~ (Page 3) • NINE ID # OR PROSPECTZHG ID ~ K-79-216-Hit INSPECTION DATH 1 1 6 INSPECTOR'S INITIALS ACS through to serve ae a spillway. The embanJ®ent appears to have been pushed into place or dumped in place at the angle of repose, and it does not appear to have been compacted. There are trees and shrubs growing in the embanJment and in the pond. If this pond ie going to remain a component of the storm water management system at the Deer Creek Quarry, it will have to be completely redesigned and reconstructed (~eee PB #4 on the last page of this report) . Item 5 Maintenance item #5 Ls related to the routing of Wildcat Gulch into a culvert under the topsoil stockpile. The operator has stated that flows in Wildest Gulch that would exceed the flow capacity of the culvert would overtop the channel and sheet flow across the terraces to the Wildcat Gulch channel below. Saved on observations made during this inspection, it appears that flows that exceed the carrying capacity of the culvert would submerge the culvert entrance and back up into the gulch. This being the case, the culvert entrance should be stabilized 6y installation of wing walla or placement of rip rap, A trash rack also needs to be installed at the culvert entrance, and the culvert entrance area needs to be cleared of brush. In addition, the culvert outlet location needs to be identified. We searched for a culvert outlet in the field, but could not find it. Once the culvert outlet has been identified, it needs to be evaluated for carrying capacity and stability (see PB #4 on the Last page of this report). General Observations Related to Site Runoff 1. Host of the runoff from the upper, undisturbed portions of Wildcat Gulch is routed to the culvert under the topsoil stockpile. 2. There ie a berm running across Bench #3 that serves to detain runoff from the upper poet LOn~ of the quarry. The silt deposited behind this berm ind is atee that it has been effective in settling eolide from the runoff. 3. The rnnoff from the upper quarry that reports to the bermed area located on Bench #3 flows primarily ae sheet flow then into gullies developed in the roads that are on ramps between the upper quarry benches. These gullies eroded into the road surfaces exit into a wedge of crusher fines piled on the uphill end of Bench #3, and a large erosion gully has eroded this pile of fines. Otility Pole It was observed that there ie a utility pole installed at the crest of the highwall above the scale house. The presence of a steeply dipping fracture oriented sub-parallel and just interior to the highwall has caused sloughing of the highwall adjacent to the utility pole Location as evidenced by the rubble pile at the base of the highwall and the fresh scarp on the highwall. The viability of the utility pole is threatened by continued sloughing. In accordance with Section 34-32.5-115(4)(e) of the Reclamation Act for the Extraction of Construction Materials, the operator moat secure an agreement with the owner of the utility pole that the operator will provide compensation for damage to the pole, or the pole must be relocated to a stable location or otherwise stabilized. Summary and Conclusions Stormwater flown through the Deer Creek Quarry Bite need to be evaluated and these flows and the potential for dischazge of suspended eolide to Deer Creek need to be characterized. Based on this evaluation, a storm water management system needs to be designed and installed that ie capable of contalning suspended eolide on site that may be generated during the 10- yeaz, 24-hour storm event. It ie likely that a combination of storm water management structures will be required for the Deer Creek Canyon Quarry, and that the management plan will call for efficiently routing runoff from the undisturbed area above the quarry through or around the disturbed area, installing a aeries of ditches, cross drains, and detention structures within the disturbed area to minimize erosion and to settle eolide out of the runoff, and reconstruction of the settling pond at the base of the quarry to provide a final polishing step prior to discharge of storm water to Deer creek. The operator needs to complete such an evaluation and put together a management plan for Division review and approval (see PB #4 on the last page of this report). Once the Division has approved the storm water management plan, specific deadlines will be established for implementation.