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LURAY SrLV97 MINES <br /> 25. Description of any tertiary containment structures. <br /> Response: Primary containment are the vessels that contain the liquid. Secondary are the containment <br /> areas and sump systems that return liquids to process water as detailing in the construction drawings. <br /> The mill facility is the tertiary containment. There are also concrete aprons in front of the reagent room <br /> and the mill filter building to provide additional containment. <br /> 26. In the Chemical Handling Section on Page 11 it states "If water, slurry or liquid chemical is spilled in <br /> the reagent room area, it will flow to a sump, where it will be pumped back to the 18,000 gallon <br /> process water tank or reagent mixing tanks depending on the material spilled." This does not <br /> match with what was proposed in TR-14. Please revise the statement to be accurate to the <br /> process. If necessary TR-14(Reagent Room EPF certification) may also need to be revised. <br /> Response:If the spill is undiluted, it will go back to the tank. If it is diluted it will go to the process water. <br /> Waste characterization will be completed as needed per CO state regulations. <br /> 27. After updating Table 1, please add a column to Table 1 identifying the number of tanks and a <br /> separate column including the total volume of the tanks.This will allow for an accurate calculation of <br /> the total volume in the circuitry. <br /> Response:Please see updated Table 1. <br /> 28. Drawing 300-GA-010 depicts the electrical room at the back of the Mill Tunnel. Please provide <br /> information regarding what systems are in place to prevent a major spill from entering the room <br /> and possibly causing damage to the electrical components inside. <br /> Response: There is an 8"curb located in front of the electric room and the mill facility contains sumps. <br /> The curb is designed to redirect flow away from the electrical and towards a sump located underneath <br /> the ball mill. If fluids make it past the 8"curb, there is an additional 4"curb with a sump between the 8" <br /> and the electric room. <br /> 29. Section 3.4 discusses the handling of tailings as it relates to the mill circuit process and Section <br /> a. discusses the thickener including the tailings delivery and return lines. In verifying the <br /> information contained in the revision as well as previous permit documents it is unclear if the <br /> tailings delivery and return lines on the pipe rack are double walled. If the pipes are double walled <br /> please provide verification of construction. If they are not, a double walled system will need to be <br /> installed to provide secondary containment of those lines. <br /> • As is the case in the details of TR-14 if the double walled construction is to be field fit <br /> during construction please provide a narrative discussing the size and type of pipe to be <br /> used and commit to providing the as built designs upon completion. <br /> 71Pa �� e <br />