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6 0.185 <br /> 8 0.250 <br /> 10 0.279 <br /> 12 0.330 <br /> 14 and larger 0.375 <br /> 5. All steel casing shall be equipped with a drive shoe at the lowest terminus to <br /> protect the casing from damage during installation. The drive shoe shall be <br /> made of forged, high carbon, tempered seamless steel and shall have a <br /> beveled, hardened cutting edge. If a casing is not driven, a coupling may be <br /> used in lieu of the drive shoe when it meets or exceeds the specifications of <br /> paragraph(D) (4) above. <br /> 6. The top of the casing shall be cut off smooth and level by the drilling <br /> contractor at least twelve inches above land surface and shall be free from <br /> dents and cracks. Prior to removing equipment from the site, the top opening <br /> of the well casing shall be sealed with a watertight cap or well seal to prevent <br /> the introduction of contaminants into the well. <br /> 7. The casing in wells constructed to obtain water from a consolidated rock <br /> formation shall be: <br /> a. Adequate to prevent any formation material from entering the well in <br /> excess of the levels specified in Section II (H) of this Rule; and <br /> b. Firmly seated and sealed at least five feet into consolidated rock, and <br /> c. Cased to a depth of at least 62 feet below the natural ground surface. <br /> However, when it is not possible to achieve 62 feet of casing due to <br /> unstable obstructions of the borehole or collapse, less than 62 feet may <br /> be allowed with following provisions: <br /> (1) Consultation with and approval by the OCHD has been <br /> obtained, and <br /> (2) The casing shall extend at least 20 feet from the land surface, <br /> and <br /> (3) The casing shall be firmly seated and sealed at least five feet <br /> into consolidated rock, and <br /> (4) A grouted liner and sealing packer shall be installed to a depth <br /> of at least 62 feet from the land surface. <br /> 8. Upon completion of the well, the well shall be sufficiently free of obstacles <br /> including formation material as necessary to allow for the installation and <br /> proper operation of pumps and associated equipment. <br /> 9. Thermoplastic casing may be installed: (1)when the well contractor <br /> recommends thermoplastic casing, and(2)with the written consent of the well <br /> owner. Documentation must be submitted to the OCHD prior to emplacement <br /> of the thermoplastic casing. <br /> 20 <br />