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associated with ambient conditions coupled with a mechanical system to maximize air to water <br />contact by minimizing water droplet size. Water pumped from the backfill wells would be <br />moved through a system consisting of high hydraulic pressure with mechanical air make-up (e.g., <br />snow-making equipment) to maximize air to water contact. This system would be contained on a <br />geomembrane lined system comprised of either high density polyethylene (HOPE) or polyvinyl <br />chloride (PVC) membrane, depending on the estimated life of the option. The ideal goal would <br />be total evaporation of liquid volume and accumulation of constituents of concern in solid or <br />sludge form, which would be managed in accordance with applicable federal, state, and local <br />requirements. <br />To allow complete evaporation, the lined application basin would be constructed upgradient of a <br />single lined collection pond. This pond would serve to collect and retain the non-evaporated <br />portion of the pumped water, and this portion would be recirculated back through a mechanical <br />evaporation system. Non-evaporated volumes would be continually recirculated until the <br />extracted water balance is exhausted. <br /> <br />Upon completion of the operation, all materials (i.e., piping, electricaUcompressed air services, <br />etc.) would be removed from the site. The exposed geomembrane covering would be either <br />closed in place in the collection pond or removed and disposed of in accordance with applicable <br />federal, state, and local requirements. <br />4.4.4.2 Hydrologic Barriers <br />Groundwater flow from the West Pit could be influenced by the installation of some form of <br />physical barrier (e.g., slurry wall or sheet piling) in the zone where groundwater flow from the pit <br />occurs. Although feasible to construct, the physical barrier would not work without some other <br />form of groundwater control. Groundwater recharging the backfill from the Precambrian <br />bedrock would eventually cause the water table in the backfill to intercept the ground surface, <br />which would serve only to alter the location where groundwater flows from the backfill, but <br />would not eliminate the flow from the pit. <br />• <br />Battle Movrsfairs Resources, Irsc. <br />pa/002671repartslmarchrptllrl6wtrmrtgtmarch.doc 59 Marth 22. 1999 <br />