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TRAFFIC RATED WELL BOX <br /> EXISTING GRADE <br /> HOLLOW STEM AUGER NEAT CEMENT GROUT <br /> BOREHOLE (10-INCH) <br /> 1-INCH SCHEDULE 40 BLANK PVC 4-INCH SCHEDULE 40 BLANK PVC <br /> CASING, FLUSH THREADED CASING, FLUSH THREADED <br /> CASING LENGTH = 12 FT <br /> BENTONITE CHIP SEAL <br /> r•r• r•r• �•r• <br /> SEAL LENGTH.=2 FT <br /> rtirti• f�f, ��.�• <br /> r•r• �•r• r•r• <br /> r:r:' rtir• ftir• CLEAN IMPORTED COARSE AQUARIUM <br /> ;tifti• ;�r• ;~r� SAND-SAND LENGTH 12 FT <br /> rti�ti� rti�• rtirti <br /> r`�ti• rti�• rti�ti <br /> fti•ti• ti• 4-INCH 0.030 IN. SLOT SCHEDULE 40'PVC <br /> .r. }•r• }•}• <br /> SCREEN, FLUSH THREADED <br /> fti�ti� ?�:• rti�ti <br /> - f51rL. r�r• rti <br /> PVC BOTTOM CAP <br /> BENTONITE CHIP SEAL <br /> 50 <br /> CLEAN IMPORTED MONTEREY#3 SAND <br /> 1-INCH 0.020 IN. SLOT SCHEDULE 40 <br /> PVC SCREEN, FLUSH THREADED 55 <br /> PVC BOTTOM CAP <br /> TOTAL DEPTH ='55 FEET <br /> SECTION NOT TO SCALE <br /> Figure 4. Air Sparging/Vapor Extraction.Nested Well Construction <br />