Laserfiche WebLink
<br />III. COMMENTS -COMPLIANCE <br />Below are comments on the inspection. The comments include discussion of observations made <br />during the inspection. Comments also describe any enforcement actions taken during the <br />inspection and the facts or evidence supporting the enforcement action. <br />Hydrologic Balance <br />Status of Sediment Ponds <br />RP-1 -- Dry <br />RP-2/3 -- Water level 18" below sealed orifice. No evidence <br />of recent discharge. <br />RP-4 -- Dry. Cracks have not reappeared in pond embankment. <br />Engineering soils study completed by Lincoln Devore, Inc. was <br />recently submitted by the operator. The report's conclusion is <br />that the cracking was probably caused by expansion of clay soils <br />beneath the constructed embankment. The report is currently under <br />review by the Division. The operator is continuing to visually <br />monitor the embankment, and will notify DMG within 1 day of any <br />unusual events or movement of the embankment. <br />RP-5 -- Dry. Based on demonstration that the pond is sized to <br />contain the 25 year/24 hour event without discharge, and the <br />operator's commitment within TR-39 to pump the pond as necessary to <br />maintain 2.5 feet of freeboard between the water level and bottom <br />of the open channel spillway, the existing rock lining will not <br />need to be replaced. <br />Rail Loadout Ponds -- Dry. <br />Slot Storage SS-1 -- Water level a few inches below riser <br />slots, water clear. <br />Slot Storage SS-2 -- Dry <br />DP-1 -- Discharging clear water. <br />Maintenance of SAE berm and sediment trap adjacent to the gully <br />below the conveyor between the slot storage facility and the rail <br />loadout as mentioned in the previous report is still necessary. <br />Maintenance or build-up of rock filter SAE sediment control <br />structures is necessary in several locations, including various <br />reclaimed laydown areas, refuse area topsoil and subsoil <br />stockpiles, sump dewatering borehole locations, and de-gas well <br />sites. At one of the refuse area stockpiles, sediment control is <br />provided by strawbales staked in front of a culvert inlet. The <br />standard rock filter SAE design would appear to be more effective, <br />and it is recommended that the culvert and straw bales be replaced <br />with the rock filter in accordance with permit designs. <br />2 <br />