5 5

low low low to medium medium medium to high medium

*Under favorable conditions.

tThese relatively high accuracies correspond to well-designed, installed, and operated installations. Under less favorable circumstances, the accuracies would be somewhat lower, between 5 and 10%.

vacuum. Suction lift devices are the best means of sample withdrawal. Such devices have to operate near the flow sampled because the lift is limited to about 15 ft (5 m). Submersible positive displacement pumps are commonly used where equipment installation is restricted to locations too high above the water surface to operate in a suction lift mode. Although such pumps allow sampling at greater depth, they are susceptible to malfunction and clogging.

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