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centralizers will be placed at 20 feet above the bottom of the casing <br /> and every 60 feet thereafter with the final centralizers placed at 20 <br /> feet below the top of the casing. <br /> 3.0 EXECUTION <br /> 3 . 1 General <br /> 3 . 1 . 1 All casing shall be installed by a method appropriate for the <br /> specified task order, as selected by the CONTRACTOR and <br /> approved by the ENGINEER . <br /> 3 . 1 .2 The CONTRACTOR will provide the ENGINEER with welder <br /> certificates before any welding operations are initiated. <br /> 3 . 1 . 3 If casing is welded, the standards of the American Welding Society <br /> shall apply. All welds shall be fully penetrating. <br /> 3 . 1 .4 Casing lengths shall be joined watertight by a method appropriate <br /> to the material used, as selected by the CONTRACTOR and <br /> approved by the ENGINEER so that the resulting joint shall have <br /> the same structural integrity as the casing itself. <br /> 3 . 1 . 5 All casing shall be installed as near to plumb and straight as <br /> possible . Following the installation of the final casing and prior to <br /> cementing, the entire casing string will be rotated by hand to <br /> demonstrate the casing is aligned plumb within the borehole . <br /> 3 . 1 . 6 Any casing, which fails, collapses or separates during installation <br /> shall be removed from the hole and repaired or replaced at the <br /> CONTRACTOR' s sole expense. <br /> 3 . 2 Straightness and Plumbness Test <br /> 3 . 2 . 1 If, in the opinion of the ENGINEER, there is reasonable doubt <br /> about the plumbness and/or alignment of the well , the <br /> CONTRACTOR shall perform the plumbness and alignment test <br /> described in Appendix C of AW WA A100-97 at his expense . The <br /> test for plumbness and alignment shall be made following <br /> construction of the well and before pump equipment is installed. <br /> 3 . 3 Straightness and Plumbness Requirements <br /> Should the test data show that a 12-inch diameter pump cannot be set in <br /> the well to a depth of 200 feet without bending or should the well vary <br /> from plumb in excess of 2/3 the inside diameter of the 16 -inch diameter <br /> CASING <br /> 02080-3 <br /> CADOCUME-1 \mikeh\LOCALS— I \Temp\Temporary Directory 15 for IRC wells Div l .zip\07-IRC_Casing.doc <br /> 10/ 17/07 <br />