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1 <br />' ARCADISGERAGHTY&MILLER <br /> <br />Technical Support <br />Document for the <br />CDPS Permit <br />Application <br />' 19) Flow measurement: The vendors will provide an inline Flow measurement device. We anticipate that <br />the flow measurement will be direct, based on the output and treatment capacity of the plant. Specific <br />information regarding Flow measurement will be provided. <br />' 20) Improvements: TR-26 provides an exact description of [he system improvements proposed to be <br />added by BMRI to protect the environment. Specifically, section 1.0 provides a chronology through <br />March 22, 1999. Improvements made after that date include further collection of the seepage and <br />pumpback to attempt to reduce the flow from the seepage front. Additionally, an enhanced evaporation <br />system has been installed and commissioned to dispose of water extracted from the alluvium and <br />' backfi II as Phase 1 of the long tens water management program as described in section 6.1.2 of TR-26. <br />Requests for veatment availability and price costing have been released and received for installation of <br />' an active water treatment system. Finalization of contract award and notice to mobilize is expected by <br />the end of August 1999. Equipment mobilization and set up is expected prior to finalization and <br />approval of the permit application. <br />' Other improvements anticipated are as follows: <br />Phase I is controlling flow from the West Pit and lowering the water level in the West Pit approximately <br />I S feet <br />• Water removed by combination of enhanced evaporation (summer 1999), nanofiltration (winter <br />' 1999), and agricultural use (pending) <br />• Pumping from backfill and window area. <br />' Phase 11 consists of using the groundwater from the West Pit to supplement agricultural water at the <br />Rocky Mountain Farms. <br />' Phase III would be based on the results obtained from conducting apilot-scale test of passive biological <br />treatment to reduce sulfate, produce alkalinity, and precipitate metal sulfide compounds. Additionally, <br />manganese may be treated using a passive aerobic treatment system. <br />21) fs or will land application of any wastewater being practiced. No <br />' 22) Average flow and treatment: See discussion in question 17. <br />23) For each outfall, provide latitude, longitude and receiving water. <br />' Outfall 001 (above RS-3A): Latitude: 37° 15' 8"/Longitude: 105° 20' 19' <br />24) Are the receiving waters a ditch or storm sewer? No. <br />' 25) Do you have a certified Operator? No <br /> <br />7/10 <br />1 <br />