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Advantages Disadvantages <br /> Pump is constructed of inert materials; Deep sampling requires large volumes of gas <br /> most pumps are designed specifically to and longer cycles,thus increasing operating <br /> sample for low levels of contaminants. time and expense and reducing portability. <br /> Driving gas may not contact the sample, Check valves in some models are subject to <br /> thus minimizing sample aeration and gas failure in water and high solids content. <br /> stripping. <br /> Pump is portable,though accessory Most available models are expensive. <br /> equipment may be cumbersome. <br /> Relatively high pumping rate allows well Minimum rate of sample discharge of some <br /> evacuation and collection of large sample models may be higher than ideal for sampling <br /> volumes. of volatile compounds <br /> Sample delivery rate can be controlled on <br /> some models. <br /> Most models are capable of pumping lifts <br /> in excess of 200 ft. <br /> Pump diameters are variable, depending <br /> on the application. <br /> Pump is easily disassembled for cleaning. <br /> Table 9.Gas-Operated Bladder Pumps Advantages and Disadvantages <br /> B.6.9. Submersible Pumps <br /> Submersible pumps are generally not used for sample collection and are not currently used by <br /> NS. They are useful in purging large-volume wells of stagnant water; however, severe aeration <br /> and turbulence of the sample occur because of their method of sample delivery. Table 10 lists <br /> the advantages and disadvantages of using a submersible pump. <br /> Advantages Disadvantages <br /> High pumping rates are Sampling technician has little control of flow rates; not <br /> possible for well purging. possible to adjust from a high rate for purging to a low rate <br /> for sampling. <br /> Pump can be used at depths Severe aeration and degassing of sample occurs,thus <br /> of more than 200 ft. volatilizing organics and other sensitive compounds. <br /> Pump has limited portability and requires a power source <br /> for operation. <br /> Table 10.Submersible Pump Advantages and Disadvantages <br /> Daub&Associates, Inc. Page B-17 Natural Soda LLC 2022 SAP <br />