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r.v~rvep <br />-~- DEpiYER <br />11~~ .. <br />OF E EXHIBIT D ~~~ ~••°r~ <br />MINE PLAN <br />ice <br />The plan calls for the expansion of an existing gravel extract o~ y r with <br />the continued gravel screening, crushing, washing, asphalt and concrete production. <br />Exhibit C Depicts the original and proposed permit boundary, the existing mining area, site <br />features, and the location of other uses ancillary to the operation. <br />Operations within the pit area will be limited to the hours of 7:00 A. M. to 7:00 P. M. and will <br />occur intermittently through out any given year. Asphalt production will normally occur <br />intermittently between the months of March and November. <br />MINING AREA -Gravel extraction began in 1981 near the southeast corner of the original <br />permitted boundary and proceeded towards the west. Approximately 1.5 acres of the <br />original pit boundary has had some gravel extraction activity. Extraction of the gravel <br />resource has resulted in the creation of a small pond. Water in the pond is intercepted <br />ground water and fluctuates throughout the year depending upon the elevation of the <br />Gunnison River. The mining plan call for the future extraction of the resource to occur in <br />three almost equal sized phases within the 9.5 acre extraction area. The maximum area <br />disturbed at any one time within the extraction area will be 3.3 acres. Due to the unknown <br />nature of the future sand and gravel needs in the Delta area, it is difficult to determine <br />exact resource requirements. However, a 5 year to 7 year life expectancy, per phase, is <br />considered to be a reasonable forecast. <br />As a result of the past gravel extraction the nature of the gravel deposit has been <br />determined. The 30 foot thick sand gravel layer is in an alluvial deposit overlain with 4 feet <br />to 5 feet of overburden. Material contained within the overburden consist of 6 inches to <br />8 inches of topsoil underlain by a layer of sandy silts and some clay deposits. The sand <br />and gravel is situated on top of a relative flat bedrock layer of shale. <br />When the gravel extraction process begins outside of it existing area, the first step of the <br />process will be the topsoil removal. The 6 inches to 8 inches of top soil will be removed <br />from the extraction area by phase at any given time. The topsoil will be removed using <br />scrapers, loaders and dump trucks and stored in a stockpile along the southerly side of the <br />identified processing area. <br />Once the topsoil has been removed from the mining area, the overburden removal will <br />begin. As was the case with the topsoil removal, overburden will be excavated using <br />scrapers, loaders, and dump trucks. Overburden will also be stockpiled along the <br />southerly boundary of the process area in separate stockpiles from the topsoil. To prevent <br />erosion the stockpile(s) will be seeded within 12 months of there establishment. All of the <br />stockpiled overburden will ultimately be used in the reclamation process. <br />The sand and gravel extraction process will be conducted using loaders, and/or <br />excavators. Dump trucks will transport the resource to the identified process area, or to the <br />ultimate delivery site. Each phase that is mined will be done in a succession of 10 foot to <br />20 foot layers until) the deposit reaches the underlying bedrock strata. Since ground water <br />will be present during the early stages of the extraction process an NPDES permit will be <br />Rt~.uzse~ D-1 <br />