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Lyons Quarry <br /> 112d Reclamation Permit Operations Z <br /> Technical Revision <br /> during construction activities. BMPs will be established in accordance with the Boulder County Storm <br /> Drainage Criteria Manual that requires the design of BMPs be consistent with the guidance in the <br /> Colorado Department of Transportation (CDOT) Erosion Control and Stormwater Quality Guide <br /> (CDOT, 2006) or the Mile High Flood District(MHFD), Urban Storm Drainage Criteria Manual <br /> Volume 3 (UDFCD, 2016). <br /> Appropriate measures will be taken to ensure areas outside of the affected land are protected and <br /> any refuse associated with the flood-impacted area, or any identified hazardous materials, are <br /> disposed of properly. At this time there are no known hazardous materials on site and the <br /> construction documents will include specifications that require the contractor to stop work <br /> immediately and notify Aggregate Industries and the State if any hazardous materials are <br /> encountered. Once the site controls are installed, the grading plan will be implemented. <br /> 3.1 Excavation of the Fountain Formation <br /> The overburden Fountain Formation will be graded back to a slope of 2H:1V. Excavation, either via <br /> heavy equipment or blasting, will be required for the overburden sandstone material of the highwall <br /> crest area, from the northeast corner of Quarry 2 to the eastern extent of Quarry 1. The excavated <br /> overburden Fountain Formation slope will not exceed the 1.51­1:1V profile described in the Kleinfelder <br /> report Section 7.1.1 —Slope Template I (Figure 5). <br /> March 2021 1 7 <br />