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32" <br /> 6"THK.CONCRETE <br /> PAD <br /> 32" } <br /> STANDARD CNI OR EQUIVALENT VAULT BOX <br /> 16" <br /> }-16" <br /> PLAN <br /> 6"THK. CONCRETE PAD <br /> EXISTING GRADE <br /> STANDARD CNI OR EQUIVALENT VAULT BOX <br /> LOCKING <br /> WELL CAP <br /> HOLLOW STEM AUGER BOREHOLE <br /> CEMENT SEAL <br /> 6-INCH BLANK PVC CASING, <br /> FLUSH THREADED SCHEDULE 40 <br /> f }�f BENTONITE PELLET SEAL <br /> 64NCH SLOTTED PVC CASING, <br /> FLUSH THREADED SCHEDULE 40. <br /> SLOTTED CASING WILL EXTEND FROM <br /> 5-FEET ABOVE GROUNDWATER TO <br /> 20-FEET BELOW GROUNDWATER <br /> CLEAN IMPORTED SAND <br /> 5 FOOT SECTION OF 6-INCH -DIAMETER BLANK <br /> PVC CASING, FLUSH THREADED SCHEDULE 40 <br /> PVC BOTTOM CAP <br /> SECTION NOT TO SCALE <br /> Figure 4. Typical Extraction Well Construction <br />