2019-03-18_PERMIT FILE - M2018016 (9)

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37. On Page G-1, the Applicant states during mining, runoff that occurs within the disturbed area will be routed to the active mining pit. Please provide a plan describing how water runofffrom disturbed areas,piled material and operating surfaces will be managed to protect against pollution of either surface or groundwater both during the after the operation pursuant to Rule 6.4.7(2)(b). See the revised surface water discussion in Exhibit G. 38. On Page G-1, the Applicant states surface and sediment laden water flow barriers include the pit highwall and topsoil berms and windrows along the pit perimeter. Please provide construction details for the stormwater control berms and windrows. Please explain how topsoil berms used as stormwater control structures will be protected from erosion from the stormwater flow pursuant to Rule 3.1.9(1). See the revised surface water discussion in Exhibit G. 39. On Page G-1, the Applicant states there are 7 wells within 600 feet of the Douglas Mountain Mine. Please state if the Applicant is pursuing well agreements with the existing well owners within 600.feet of the site. Please provide signed copies of the agreements, if available or provide evidence the appropriate notice was provided to the well owners. The applicant will notify all well owners within 600 feet of the mining area of the presence of mining activity. The applicant will pursue well agreements with any interested well owners. Notification of well owners and documentation of said notification will be handled in accordance with CDWR rules and regulations. Most well owners are also structure owners and received structure agreements from the applicant. Notification for any additional well owners will be conducted as needed. 40. On Page G-1, the Applicant states there are 7 wells within 600 feet of the Douglas Mountain Mine dug to depths below the pit bottom. During the pre-operational inspection, the Applicant stated a cross-section of the proposed mine site with the well data and monitoring well data was created to understand the relationship between the wells and the mining operation. Please provide the Division with a copy of the well cross-section for review. Additionally,please provide a geologic cross-sections) illustrating the relative depths of the surrounding wells, the elevation of the West Fork of Clear Creek and the lowest anticipated pit floor elevation. The wells and piezometers located on the site have been added to Map C-3. See the revised Map C-3. 41. On Page G-2, the Applicant states to handle stormwater in an organized manner, sumps will be maintained within the site in areas not being actively mined and the site will slope towards the sumps. Please provide design and operational details for the sumps. The reference to sumps has been removed from Exhibit G. All stormwater will be contained within the mining pit to infiltrate or evaporate. DR1R Aline AM-01 9 � (.nk I rHicA and lsurcielr 1'I I 1