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Ouray Silver Mines, Inc. <br /> 1900 Main St. Unit 1 <br /> PO Box 564 <br /> Ouray,CO 81427 -----' <br /> l 11 RAY SiILVFR A 1kti�E <br /> To: Colorado Division of Reclamation, Mining,& Safety <br /> 1313 Sherman St. Rm. 215 ��� � <br /> Denver, CO 80203 <br /> September 16,2021 SEP 2 0 2021 <br /> DIVISION OF RECLAMATION <br /> Dear Mr. West MINING AND SAFETY <br /> Ouray Silver Mines Inc. (OSMI)received the 2nd Adequacy Review for Technical Revision 16 to Permit <br /> M2012-032; rthe Revenue-Virginius Mine(Mine). The Adequacy Review raised 7 major points, each <br /> of which are addressed in italics under headings that repeat the DRMS point of clarification. A list of <br /> tables and attachments added to this Adequacy Review Response is found below: <br /> Oil/Water Separator Technical Information <br /> Updated Vehicle Wash Area Drawing <br /> Equipment Storage Sheds <br /> 1. Your response of removing the concrete footers for the Equipment Storage Sheds to a depth of 1 foot <br /> below grade is noted,however Division policy is that all concrete will be buried a minimum of 3 feet <br /> below final grade and that no structural elements(rebar)may be protruding. The Division will bond as <br /> such. Please commit to removing concrete footers in accordance with this policy. <br /> Response: The mine commits to removing the footers according to Division policy and will remove the <br /> footers a minimum of 3 feet below final grade. <br /> Equipment Wash Area <br /> 2. The drawing submitted of the vehicle wash pad is overly simplistic, please provide a more detailed <br /> drawing of the Equipment Wash Area. The drawings should include but are not limited to details <br /> regarding curbing around the perimeter of the pad, location of the sump and its relationship to and <br /> location of the Oil Water Separator. <br /> Response:Please see the attached drawing. There will be a I foot curb surrounding the wash area except <br /> for the entrance to the wash pad which will be left open to allow equipment on rail to enter the area. A <br /> submersible 5 gpm pump will be placed into a 3'X 3'X 3'sump located at the end of the wash pad. Wash <br /> water pumped by the submersible pump will report to the oil water separator, which will be located <br /> inside of the underground shop. <br /> 3. The drawings submitted depict that the equipment wash area does not have walls. It is likely that <br /> contaminated(hydrocarbon)water would not end up on the wash pad and instead the area around the pad <br /> would become contaminated over time. Please describe and include in the updated drawings if necessary, <br /> to address how splash-back water resulting from washing of vehicles will be contained. <br /> Response: OSMI will place portable plastic curtains (similar to the welding screens found on site) around <br /> the pad prior to washing vehicles. The curtains will contain any splash back off of the vehicles and will <br /> ensure that hydrocarbons remain inside of the pad. <br /> Phone:(970)325-9830 ♦ Fax:(970) 325-9824 <br />