Laserfiche WebLink
is clear. Suction-lift pumping can only be used if the depth to water is less than approximately <br /> 25 to 30 ft. <br /> When using suction-lift pumping as the sole means of development, "over-pumping" is used to <br /> remove entrapped sediment from the well screen, filter pack, and formation. For this <br /> approach, the intake line is installed at the bottom of the well, and the well is pumped at its <br /> maximum rate for extended periods (in excess of 10 minutes) and then allowed to recover. The <br /> process is repeated until maximum improvements in capacity and/or well-water clarity have <br /> been achieved. <br /> B.15.6.4. Submersible Pumping <br /> Submersible pumps may also be used in conjunction with surging or jetting for well <br /> development. Submersible pumps are not as effective as suction-lift pumps for pumping water <br /> with large amounts of suspended sediment (particularly sand-size sediment). In addition, <br /> submersible pumps cannot be used to pump accumulated sediment from the bottom of a well. <br /> For this reason, submersible pumping should not be used as the sole means of developing a <br /> well, as can be done when using a suction-lift pump. The sequence of surging or jetting and <br /> submersible pumping should continue until the capacity of the well and the clarity of the water <br /> cease to increase. <br /> When using a submersible pump in conjunction with surging or jetting, the pump should be <br /> installed after completion of each surging or jetting episode. To provide for maximum removal <br /> of suspended sediment, the submersible pump should be lowered to the bottom of the well on <br /> a suspension cable. For small pumps and shallow wells, the cable can be lowered by hand. For <br /> large pumps or deep wells, the weight of the pump and the discharge hose requires that a cable <br /> reel mounted on a tripod or vehicle be used for lowering and retrieving the pump. <br /> After the pump is lowered into position, the electrical cord should be connected to a power <br /> supply. Do not connect the electrical cord to the power supply until the pump is installed in the <br /> well. Some submersible pumps are not grounded and could electrocute an individual if the <br /> pump is touched while turned on. After turning on the pump, continue pumping until the <br /> discharge water is clear. <br /> After the discharge water becomes clear (or ceases to improve) and the pump is disconnected <br /> from the power supply, remove the pump by lifting or cranking up the suspension cable. The <br /> pump should never be removed by lifting or pulling on the electrical cord or the discharge hose. <br /> B.15.6.5. Foot Valve Pumping <br /> A foot valve pump is simply a length of semi rigid hose or pipe with a foot valve attached to one <br /> end. A foot valve pump uses the momentum of water contained in the "discharge line" to lift <br /> water from the well as the discharge line is rapidly moved up and down. The foot valve on the <br /> bottom opens during the down stroke, allowing water to enter the discharge line. During the <br /> upstroke, a spring in the valve, combined with the weight of the water, forces the valve closed. <br /> A foot valve pump can be used in conjunction with surging or jetting to remove entrapped <br /> sediment particles from a well. Foot valve pumping is effective for removing sand-size <br /> Daub &Associates, Inc. Page B-40 Natural Soda LLC 2022 SAP <br />