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405.2.4 Monitoring Well Design
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Not less than two wells shall extend to a depth of not less than 6 feet (1829 mm) below the ground surface and shall be not less than 3 feet (914 mm) below the designed system depth. However, with layered mottled soil over permeable unmottled soil, not less than one well shall terminate within the mottled layer. Monitoring at greater depths shall be required, where necessary, due to site conditions. The site evaluator shall determine the depth of the monitoring wells for each specific site. Depths shall be approved. The monitoring well shall be a solid pipe installed in a bore hole. The pipe size shall be not less than 1 inch (25 mm) and not greater than 4 inches (102 mm). The bore hole shall be not less than 4 inches (102 mm) and not greater than 8 inches (203 mm) larger than the pipe (see Appendix A, Figure A-2).
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Appendix A System Layout Illustrations
the outside diameter of observation well pipe size.
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
FIGURE A-2 (SECTION 405.2.4)
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