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Vented locking <br />protective cover <br />casing <br />Cement surface <br />seal <br />o n ? o <br /> <br /> Annular seals:..-. <br />Aquifer <br /> :Secondary filter'..:: <br /> .pack: <br /> 0 o <br />: <br />: Primary filter <br /> . <br />.: pack .:: ... ..: <br /> o <br />Well screen'.' :..: : <br /> <br /> a Plate.bottom <br /> 0p 0 . <br />Not to scale <br />Figure 4. General design of a monitoring well in unconsolidated deposits for National Water- <br />Quality Assessment Program Land-Use and Flowpath Studies. <br />24