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• Define a pipeline alignment between the West Pit wells and the proposed <br />location for the new irrigation pond. The alignment will: (1) be located <br />entirely on property either owned by BMRI, where BMRI holds an <br />existing easement, or within the limits of existing public right of ways, (2) <br />not interfere with major site facilities, and (3) minimize pipeline length <br />while avoiding excessive earthworks for pipeline construction. <br />• If replacement sections of pipeline aze necessary, they will be constructed <br />from HDPE pipe and have the capacity to convey the flow from two of the <br />West Pit pumps operating simultaneously, in addition to the flows from <br />the two alluvial aquifer interceptor wells. The pipeline was designed to <br />convey a flow of 550 gpm to meet this objective. <br />• The pipeline profile will generally allow for non-pressurized gravity flow <br />to the extent practicable without requiring extensive earthwork for <br />excavation. <br />• The well dischazge pipeline connecting the interceptor wells with the <br />irrigation pipeline will be designed to avoid backflow from the irrigation <br />pipeline into the wells in the event of check valve malfunction during <br />pump shutdown at either of these wells. This will be achieved by locating <br />the tie-in point from the interceptor well dischazge line at a locally steep <br />section of irrigation pipeline where pressurized flow will not occur. <br />Additionally, the tie-in point will be located below the high points in the <br />feeder lines and siphon breaks will be installed at the well heads. <br />• The pressure rating of the pipe shall be sufficient to withstand the <br />maximum anticipated pressure in the pipe (occurring under maximum <br />flow conditions). <br />• Air Vacuum Air Release valves (AVAR) shall be located along the <br />pipeline high points where air pockets will tend to accumulate at locations <br />where flow will change from full flow to partial flow conditions. <br />• Drains and isolation valves shall be located along the pipeline at low <br />points in the pipeline to allow for full drainage of the pipe and at other <br />locations where isolation is required for operations and pressure testing. <br />• Provide for the ability to perform pressurized leak testing of sections of <br />the completed pipeline prior to placing the pipeline in service. The <br />pressure used in the leak test should not exceed the pressure rating of the <br />pipeline, valves, fittings, and other piping components. <br />A hydraulic analysis was performed to ensure that the pipeline alignment, sizing, and <br />pressure rating would be appropriate at the design flow. The analysis was performed <br />under maximum design flow conditions and an evaluation completed to determine <br />Battle Mountain Resources, /nc. 21 Telesto Solutions, /nc. <br />PiPmjects\212-Newmom(SanLUis)VSaNUis\PermitAmenJmem- West Pit Management\V6 R¢ponffiPDFS\PCrmuAmeibmeni v4.JOC October 2006 <br />