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` will be cleaned periodically as dust layers build up to minimize pressure drop. Captured dust <br /> from these devices will be returned to the production process. <br /> • <br /> Access to the site will be gated. When the site is unattended, all vehicles and equipment will be <br /> secured and locked. Control of access to open extraction will be accomplished with warning <br /> signs and/or fencing. Fencing currently exists at the Site. The mining operation will not involve <br /> the creation of any steep slopes. The gravel resources to be mined are located only in long <br /> narrow ridges. It is anticipated that these gravel containing ridges will be excavated and <br /> removed, leaving a relatively flat landscape behind. Once removed, only minimal excavation <br /> will occur below the ridges. <br /> To prevent weeds and unsightly vegetation, stockpiled topsoil will be placed on graded and <br /> mined surfaces intermittently as the phased mining progresses. Graded areas and completed <br /> phases will be re-vegetated with standard MnDOT seed mixtures. <br /> 2.11 RESTORATION PLAN <br /> Upon completion of mining, the Site will be returned to agricultural use or potentially used for <br /> residential or commercial development. As phases of the operation are completed, the stockpiled <br /> soils and topsoil will be distributed and graded across the mined area. Backfilling will be with <br /> materials that are suitable for building and backfill. Stockpiled topsoil will be placed on graded <br /> • and mined surfaces intermittently as the phased mining progresses. Topsoil will be seeded and <br /> mulched to prevent erosion. Standard MnDOT seed mixtures will be used and when necessary <br /> trees will be planted. Final grades will range from 1% to 25%. Sheet 6 in Appendix C is the <br /> Restoration Plan showing the proposed final contours of the Site. <br /> 3.0 STANDARDS AND REQUIREMENTS <br /> 3.1 BOUNDARY _ <br /> Extraction operations will be conducted within the confines of the extraction site described in the <br /> application. <br /> 3.2 PROHIBITED AREAS <br /> No mining operations will be conducted within five feet of the right of way of an existing public <br /> utility. <br /> Mining will not occur within fifty feet of the boundary of any zone where such extraction <br /> operations are not permitted. Setbacks from the wetlands will be at least fifty feet. <br /> • <br /> LIESCH ASSOCIATES,INC. <br /> January 2003 Hydrogeologists•Engineers Environmental Scientists Page 5• <br />