2020-04-13_REVISION - M1974069 - Laserfiche WebLink

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1))i Loveland Ready-Mix Concrete, Inc. NW 0 ter M1974-069 April 6, 2020 L OVELAN D Inspection Report Status Update; additional backfill is not required to meet the intent of the Reclamation Plan. R EADYMIX Cell/Pits 5 and 6 CONCRETE1. Cells 5 and 6 operated as silt settling ponds up until the completion of Cell 20. No further activity is planned for these mining cells. 2. Cell 5 was identified for augmentation under W-7412 with a projected final PO BOX 299 water surface area of 3.39 acres. The current exposed area of 2.75 is less than LOVELAND, CO 80539 allowed so no backfilling of this cell is required. 3. Cell 6 was identified for augmentation under W-7412 with a projected final OFFICE 970.667.2680 water surface area of 2.27 acres. Cell 6 is essentially silted in with some limited FAX 970.667.0092 water exposure around the perimeter trenching so no backfilling of this cell is required. 4. The Task Costs 10, 11, 13, and 14 provided in the Division's March 24th, 2020 Inspection Report Status Update account for additional topsoil and revegetation in Cells 5 and 6 that will be sufficient to insure these areas are reclaimed to meet the overall strategy and intent of the Reclamation Plan. Augmentation of Exposed Water Surfaces 1. Water loss from evaporative depletions for all mining cells with exposed water surfaces both within the permit boundary and in mining cells previously released from the mining permit boundary are covered either as pre 1980 mining or in the State approved augmentation plans 00CW142 and W-7412. 2. 00CW142 acknowledges that mining operations are ongoing at the Larimer Pits. Paragraph 14.3.1 allows for"Up to 52.29 acres of ground water surface area were, or will be, exposed to the atmosphere by mining the Larimer Pits 13,14,15,18, and 20 resulting in net evaporation averaging 109.24 acre-feet per year".The attached Figure 1, prepared by BBA Water Consultants, shows the exposed surface area for all exposed water in Cells 13, 14, 15, 18, and 20, that are augmented under 00CW142. Their respective areas are as follows: Cell/Pit No. Area Exposed Status Water Surface 13 15.5 acres Reclaimed and released 14 13.5 acres Backfilling/Reclaiming 15 5.9 acres Reclaimed and released 18 0.3 acres Substantially reclaimed 20 8.5 acres Reclaiming Total Exposed 43.7 acres Less than 52.29 allowed 3. The current Well Permit 69035-F allows for"an additional 12.02 acres to be exposed at the Larimer Pit within pond nos. 18 and 20." It also references the total surface area of the gravel pit ground water pond nos. 13, 14, 15, 18, and 20 limited to 52.29 acres exposed. 31