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8 <br />Construction Materials Rule 3.1.6(3). <br />3. The Applicant intends to shape the contours of the mining operation so <br />that 3:1 slopes will be maintained at all times. Site-specific characteristics <br />will direct any runoff into the mining area if a major precipitation event <br />occurs. Side slopes will be planted with different varieties of wheatgrass, <br />Russian wildrye and annual ryegrass. Topsoil from the excavation azeas <br />will be placed in berms and seeded with a mixture of wheatgrass and <br />orchard grass. <br />4. The weight of the evidence demonstrates that the Applicant has met the <br />minimum requirements of Construction Materials Rule 3.1.6(3). <br />D. Impacts to Groundwater Quality <br />1. Construction Materials Rule 3.1.7 requires the Applicant to determine if <br />the proposed operation will impact groundwater quality and, if so, to meet <br />other requirements set forth in Construction Materials Rule 3.1.7. <br />2. The Objectors assert that the Applicant has failed to comply with <br />Construction Materials Rule 3.1.7. <br />3. The groundwater quality issues that could arise from the proposed <br />operation concern sedimentation from mining operations and the <br />accidental release of petroleum products. The Applicant will impound <br />stormwater to allow for settling of sediments prior to recharge into the <br />groundwater. The Applicant may seek a permit from the Colorado Water <br />Quality Control Division if circumstances require the release of <br />8 <br />