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take place beginning at the bottom of the screen and progress vertically until <br /> there is no sand, silt, and mud in the development water. <br /> 2.3.13 Development by Pumping <br /> The Contractor shall furnish, install, operate, and remove a deep well pump <br /> for developing the well. The Contractor will also be responsible for furnishing a <br /> power supply to power the pump.r It is estimated that the pump will require a <br /> maximum capacity in excess of 200 gpm. The total heads for maximum <br /> capacities are expected to be in the order of 20 to 40 feet. <br /> The Contractor will furnish and install discharge piping for the pumping unit <br /> of sufficient size and length to convey water to a point designated by the <br /> supervising geologist, together with acceptable orifices, meters, or other approved <br /> devices, which will accurately measure the flow rate. The length of discharge pipe <br /> required will not exceed 100 feet. <br /> The initial pumping rate will be restricted. As the water clears, the pump <br /> rate will be gradually increased until the maximum rate is achieved. The <br /> maximum rate will be determined by the supervising geologist after consideration <br /> of the well's drawdown and discharge characteristics. At proper intervals the <br /> pump shall be stopped and the water in the pump column shall be allowed to <br /> surge back through the pump bowls and through the perforated area. <br /> The Contractor shall continue development until, in the opinion of the <br /> supervising geologist, the following conditions have been properly met: <br /> a. Sand production is less than 5.0 parts per million within ten minutes after <br /> commencement of pumping at the maximum pumping rate. Sand <br /> production shall be measured by a centrifugal sand separating meter. (See <br /> 14 <br />