2008-02-27_PERMIT FILE - M2008010

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Mud Creek Pit -Reclamation Permit Application -112 (C) Exhibits Page 17 of 67 SECTION D-10. ASSUMPTIONS USED 1N MINING PLAN: The mining plan is based on several key assumptions, stated herein for evaluation. These assumptions are not intended to imply or claim that certain actions will be done. 1. Annual demand for sand and gravel from this pit will average 120,000 tons. However, demand, and therefore production, may vary significantly from year to year, and therefore acreages affected during a given year may be either larger or smaller than included in this plan, thus impacting on stockpile size and other matter. 2. Activities on the site (stripping, mining, stockpiling, etc.) will be done year-round. 3. An average of the upper 2 feet is considered usable topsoil, for planning purposes. Topsoil and subsoil not considered mineable material varies from 5-6 inches to 4 feet in depth. Topsoil and subsoil will generally be used "as-is" for reclamation but may be modified to improve reclamation as farmland (cropland and pasture) as recommended by agronomist, by screening, amendment, or additives. 4. Mineable material ranges in depth from 15 to 30 feet, and is expected to average 20 feet. 5. Water table in the pit area fluctuates seasonally and from year to year but is generally low, and soil is often not saturated above the shale. 6. Wash water for processing will be recycled and will be mixed with storm water and irrigation return flows for discharge, if actually discharged. 7. A plant is expected to be on-site during the period of stripping and mining, so that large temporary stockpiles of soil and raw material will be quickly processed and remain in existence for very brief periods. 8. Based on other permits, mining is limited initially to the shipping of 120,000 tons per year.5 This limits the mining initially to 132,000 tons (=115,000 CYs) per year (assuming on-site use and loss of fines through screening and washing). 9. For planning purposes, excavation is planned to average 152,000 CY per year, or 4.3 acres per year, including any pockets of unsuitable material. When considering stockpiles of topsoil, access, perimeter slopes and unforeseen factors (such as areas of thicker soil, or shallower mineable material), this plan assumes that operations will disturb approximately five acres per year. 10. Initial production is expected to be under 70,000 tons per year, until operations are fully developed. As market demands change, other permits may be revised to increase production beyond the 120,000 tons/year. (See Exhibit M.) 11. It is not the intent of the application to limit mining to any specified annual level. Assuming constant production of 120,000 tons/year, the pit will operate for approximately 20 years. 5 This is not to be construed as a limitation on actual mining activities, simply a recognition that other permits (County and state) limit annual production at present, and planning reflects that limit. (Exhibit M) s Conversion of 1.15 tons/CY) ~ This assumption is modified where site geometry requires in Years 8 14 and 20. McStone Aggregates, LLC 15 FEB 2008 ©WASTELINE, INC 2008 PN 5006.1-4(009)