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24" <br /> 12" <br /> v 0. <br /> MIN 4" THK. CONCRETE PAD <br /> v v . <br /> V <br /> N <br /> TRAFFIC BOX <br /> N v � <br /> G a <br /> PLAN <br /> MIN 4" THK. CONCRETE PAD <br /> EXISTING GRADE <br /> TRAFFIC BOX <br /> i <br /> LOCKING WELL CAP <br /> 8-INCH DIAMETER HOLLOW STEM <br /> AUGER BOREHOLE <br /> CONCRETE SEAL <br /> 4-INCH BLANK PVC CASING, <br /> FLUSH THREADED SCHEDULE 40 <br /> i <br /> BENTONITE PELLET SEAL, <br /> ' - MIN 2-FOOT THICK <br /> CLEAN IMPORTED COARSE <br /> AQUARIUM SAND <br /> 4-INCH SLOTTED PVC CASING, <br /> FLUSH THREADED SCHEDULE 40, <br /> MIN 0.030 SLOT <br /> PVC BOTTOM CAP <br /> SECTION NOT TO SCALE <br /> Figure 3. Typical Vapor Extraction Well Construction <br />