2006-01-17_REVISION - M1974069 - Laserfiche WebLink

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r~ RGIiC(G H~3J EXHIBIT D -Mining Plan JAN 1 7 2006 Division of Mine als and eol y The following information pertains to the Colorado Division of Minerals and Geo{ogy fGOr ~~e Loveland Ready Mix Concrete Inc.; Larimer Pi[s; Permit #M-1974-069. The remaining extraction area is divided into two cells. There are 11.5 acres remaining to be mined from cell 8 and approximately 6 +/- acres of extractable gravel in cell 10. It is anticipated that current mining in cell 8 will be completed in 2008. Mining of cell 10 will commence following completion of cell 8. Mining of cell 10 should be finished by 2010; 2014 at the latest.* The mining of each cell will begin with the removal of topsoil and overburden, which will be stored separately in the storage areas noted on the Mining Plan Map (Exhibit C). As reported in the approved 2003 amendment, AM-1, ce118 has an overburden depth range of 30 to 50 inches, with gravel depth of 8 to I2 feet followed by shalestone. A maximum of 35,000 cy of overburden will be stockpiled at cell 8 at any one time. Every 3 to 4 acres of newly stripped overburden will be placed back into the excavated azea. The test hole logs in cell 10 show an overburden depth of approximately 60 inches and a gravel depth of approximately 19 feet. The topsoil in cell 10 will be stripped and stockpiled east of the cell between the excavation and Wilson Avenue. The eastern half of cell 10 will have remaining overburden stripped and stockpiled on the western half of the cell until gravel is removed from the first 3 acres. After the gravel is removed from the east side the overburden stockpile and the overburden from the west halfwill be backfilled into the east half ofthe excavation and used to slope sides 3:1. A maximum of 25,000 cy of overburden will be stockpiled at cell 10 at any one time. The overburden soils in the area of cell 10 have been supporting alfalfa and native hay for many years. For more detailed soils information see Exhibit I. Overburden will be removed with scrapers and/or excavators and trucks and the gravel removal will be with an excavator and trucks. A 20 horsepower, 6 inch electric pump will be used for dewatering of cel l 10. The discharge water will be pumped into existing silt ponds 5 and 6 directly north of cell 10 and will exfiltrate into the ground water through the gravel banks of the ponds. No water will return directly to the Big Thompson River, therefore, no discharge permit should be required. Approximately 1700 gpm of water is pumped from a prior pond for washing and is returned to the existing settling ponds near the office and equipment area. No water from the washing operation is discharged into the river. Mined material will be hauled by truck to the existing crushing, washing, and sizing plant byway of the haul roads noted on the Mining Plan Map (Exhibit C). The pit run material from cell 10 will be hauled down an existing roadway approximately 1000 feet to the existing crushing and wash plant. The extraction aeeas will be surface wet pits; therefore, it should not be necessary to water down any active areas other than haul roads for dust control. As detailed in AM-1, the R.O. W for County Road 19E (Namaqua Ave.), the City sewer line, and the switchyard are within 200 feet of planned excavation of cell 8. Minimum setback from these areas