2006-07-20_REVISION - M1988112 - Laserfiche WebLink

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• The pipeline will be constructed from HDPE pipe and have the capacity to convey the flow from two of the West Pit pumps operating simultaneously, in addition to the flows from the two alluvia] aquifer interceptor wells. The pipeline was designed to convey a flow of 550 gpm to meet this objective. • The pipeline profile will allow for non-pressurized gravity flow to the extent practicable without requiring extensive earthwork for excavation. • The well discharge pipeline connecting the interceptor wells with the irrigation pipeline will be designed to avoid backflow from the irrigation pipeline into the wells in the event of check valve malfunction during pump shutdown at either of these wells. This will be achieved by locating the tie-in point from the interceptor well discharge line at a locally steep section of irrigation pipeline where pressurized flow will not occur. Additionally, the tie-in point will be located below the high points in the feeder lines and siphon breaks will be installed at the well heads. • The pipeline will be buried a minimum of 3 feet to prevent damage from freezing and incidental damage from future construction and traffic. • The pressure rating of the pipe shall be sufficient to withstand the maximum anticipated pressure in the pipe (occurring under maximum flow conditions). • Air Vacuum Air Release valves (AVAR) shall be located along the pipeline high points where air pockets will tend to accumulate at locations where flow will change from full flow to partial flow conditions. • Drains and isolation valves shall be located along the pipeline at low points in the pipeline to allow for full drainage of the pipe and at other locations where isolation is required for operations and pressure testing. • Provide for the ability to perform pressurized leak testing of sections of the completed pipeline prior to placing the pipeline in service. The pressure used in the leak test should not exceed the pressure rating of the pipeline, valves, fittings, and other piping components. A hydraulic analysis was performed to ensure that the pipeline alignment, sizing, and pressure rating would be appropriate at the design flow. The analysis was performed under maximum design flow conditions and an evaluation completed to determine locations of partial pipe flow. Dynamic Hydraulic Grade Lines (HGL) were calculated and are indicated on the pipeline profile drawings (Sheets 3 through 10 of the Design Drawings). Except in 5ve sections of the pipeline that will have adverse slopes due to existing topography, the pipeline will have sufficient capacity to convey Battle Mountain Resources, /nc. G-~ Telesto Solutions, Inc. PiPmjecu~213-Newmom(SaN.uis)~SanLUis~Permn M~e,gmeot - Weu Pit Idaewgement~Pe~mitA,oendmen~ v3.0oc July 2006