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Coulson Excavating Company, Inc. - Bonser Gravel Pit <br />Exhibit D -Mining Plan <br />Mountain Saline, and Nunn Clay-Loam soils with slopes generally ranging from 0-3%. <br />Overall overburden thickness varies from 0-13 feet with an average thickness of 6 feet. <br />The gravel deposit is classified as Class A aggregate (Schwochow et al. 1974), and has <br />an average thickness of approximately 9 feet throughout Phase I, and approximately 12 <br />feet in Phase II. The gravel is underlain by Pierre shale, consisting of a weathered zone <br />directly underneath the gravel. <br />Intended Use of Extracted Commodities <br />The sole commodity to be extracted from the mine is gravel, which will be processed <br />and used for asphalt hot mix and raw road base. <br />Asphalt Batch Plant <br />Petroleum products located in the proposed asphalt batch plant will include diesel fuel <br />and liquid asphalt petroleum. These substances will be stored in above ground storage <br />tanks or within the plant itself. Little risk exists of soil and/or groundwater contamination <br />in the event of an asphalt spill, due to its high viscosity. However, in the event of a <br />diesel spill above the specified reportable amount, the appropriate mitigation techniques <br />will be implemented to ensure that the soil and groundwater are decontaminated <br />promptly and efficiently. <br />Pit Setback and Maximum Cell Depth <br />A setback of at least 40 feet will be maintained from the pit boundary to the permit area. <br />The pit boundary will be clearly staked out prior to excavation (see Figure 1, Exhibit D). <br />In addition, the entire permit area will not exceed a vertical depth of approximately 32 <br />feet, with mining conducted at an approximate slope of 0.5:1. <br />