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Figure 3. CROSS SECTION OF A TYPICAL MONITORING WELL <br /> (NOTE: Schematic, not to scale) <br /> Protective Casing <br /> with Locking Corer <br /> Casing Cap <br /> Concrete <br /> Base <br /> � 1 <br /> ti{ y r <br /> �L r — Annular Space <br /> 1 <br /> r Minimum � <br /> Borehole � <br /> ' Annular Seal <br /> Casing , <br /> r' r <br /> i� <br /> Centralizer(a) f. <br /> 1 <br /> it <br /> °Trarisition'f Seal <br /> Water Table <br /> Filter Pack <br /> Screen <br /> r� <br /> Bottom Plug or Cap <br /> Hs <br /> -36- <br />