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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 /> <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 /> <br />2.11 RESTORATION PLAN <br /> <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 /> <br />3.0 <br /> <br />STANDARDS AND REQUIREMENTS <br />3.1 BOUNDARY <br /> <br />Extraction operations will be conducted within the confines of the extraction site described in the <br />application. <br /> <br /> 3.2 PROmBtTED AREAS <br /> <br />No mining operations will be conducted within five feet of the right of way of an existing public <br />utility. <br /> <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 /> <br /> <br />