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24„ <br /> 12 <br /> .°. .a e .° <br /> ° MINIMUM 4" THK. <br /> a: CONCRETE PAD <br /> N <br /> a. TRAFFIC BOX <br /> ' N <br /> ° e ° <br /> PLAN <br /> MINIMUM 4" THK. CONCRETE PAD <br /> EXISTING GRADE <br /> TRAFFIC BOX <br /> LOCKING WELL CAP <br /> 8-INCH DIAMETER HOLLOW <br /> STEM AUGER BOREHOLE <br /> CEMENT SEAL <br /> 1-INCH BLANK PVC CASING, <br /> FLUSH THREADED SCHEDULE 40 <br /> ' = BENTONITE PELLET SEAL, <br /> MIN 5-FEET THICK <br /> CLEAN IMPORTED#3 SAND <br /> 1-INCH SLOTTED PVC CASING, <br /> FLUSH THREADED SCHEDULE 40, <br /> MIN 0.020 SLOT <br /> PVC BOTTOM CAP <br /> SECTION NOT TO SCALE <br /> Figure 2.Typical Air Sparging Well Construction <br />