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24" _ <br /> 12" <br /> MIN 4" THK CONCRETE PAD <br /> o- <br /> _ v v <br /> � T <br /> " a TRAFFIC BOX <br /> N d 1p <br /> v 4 + <br /> PLAN <br /> MIN 4" THK CONCRETE PAD _ z <br /> EXISTING GRADE <br /> S b <br /> TRAFFIC BOX <br /> LOCKING.WELL CAP <br /> 8=INCH"DIAMETER HOLLOW STEM <br /> AUGER BOREHOLE <br /> CONCRETE SEAL <br /> -- — - 41NCH_BLANK=PVC_CA7SING, - <br /> FLUSH THREADED SCHEDULE 40 <br /> BENTONITE PELLET SEAL, <br /> MIN 2-FOOT THICK <br /> CLEAN IMPORTED COARSE <br /> AQUARIUM SAND– <br /> SLOTTED <br /> ANDSLOTTED 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 />