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1 ' <br /> Disadvantages C Restricted to areas with water levels within <br /> 20 to 25 feet of the ground surface <br /> C Potential for effects on analysis of trace <br /> organics C Vacuum can cause loss of dissolved gasses <br /> and volatile organics <br />' C Heavy and cumbersome to deal with, <br /> particularly in deeper wells G Pump must be primed and vacuum is often <br /> difficult to maintain during initial stages of <br />' C Expensive pumping <br /> C Power source needed 4 4 5 Inertia Pumps <br />' C Sediment in water may cause problems with Advantages <br /> the pumps <br /> C <br /> t C Impractical m low yielding or shallow wells Portable, inexpensive, and readily available <br /> C Offers a rapid method for purging relatively <br /> 4 4 3 Non-Contact Gas Bladder Pumps shallow wells <br />' Advantages Disadvantages <br /> C Maintains integrity of sample G Restricted to areas with water levels within <br />' 70 feet of the ground surface <br /> C Easy to use <br /> C May be time consuming to purge wells with <br /> C Can sample from discrete locations within these manual pumps <br /> the monitor well <br /> C Labor intensive <br /> Disadvantages <br /> C WaTerra pumps are only effective in 2-inch <br />' C Difficulty in cleaning, though dedicated diameter wells <br /> tubing and bladder may be used <br /> 5.0 EQUIPMENT APPARATUS <br />' C Only useful to about 100 feet <br /> C Supply of gas for operation, gas bottles 5.1 Equipment Checklist <br /> and/or compressors are often difficult to 5 1 1 General <br />' obtain and are cumbersome <br /> C Relatively low pumping rates C Water level indicator <br /> - electric sounder <br />' C Requires air compressor or pressurized gas - steel tape <br /> source and control box - transducer <br /> - reflection sounder <br />' <br /> 444 Suction Pumps - airline <br /> C Depth sounder <br /> Advantages C Appropriate keys for well cap locks <br /> C Steel brush <br />' C Portable, inexpensive,and readily available C HNU or OVA (whichever is most <br /> appropriate) <br /> Disadvantages C Logbook <br /> C Calculator <br /> C Field data sheets and samples labels <br /> 4 <br />