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2 .4 .4 Pit casing shall be black steel and conform to ASTM Standard A- <br /> 252 Grade 2 or equal . <br /> 2 .4. 5 The pit casing shall remain in place. <br /> 2 . 5 Intermediate Casing <br /> 2 . 6 . 1 All intermediate well casing shall be of new and unused carbon <br /> steel pipe, shall be seamless, electric resistance welded, or double <br /> submerged arc welded with one longitudinal seam and shall <br /> conform with the latest revision of API 5L Grade B. ASTM A53 , <br /> Grade B . Ends of plain end pipe shall be perfectly square and shall <br /> be furnished beveled for field V-notch butt welding. Intermediate <br /> casings shall be as follows : <br /> Maximum <br /> Approximate <br /> Diameter ( Inches) Wall Thickness Total Length <br /> ID/OD inches Feet <br /> 24.00/23 . 25 0 . 375 140 <br /> 2 . 6 Final Casing <br /> 2 . 6 . 1 All final casing and couplings shall be of new and unused SDR 17 <br /> PVC or equivalent that conforms to requirements of ASTM D <br /> 1784 - Standard Specifications for Rigid PVC Compounds and <br /> Chlorinated Compounds, and ASTM F480 — Standard <br /> Specifications for Thermoplastic Well Casing Pipe and Couplings <br /> Made in Standard Dimension Ratios, SCH 40 and SCH 80. The <br /> casing shall be joined by a spline-lock mechanical joining system <br /> utilizing bell joints . Final casings shall be as follows : <br /> Maximum <br /> Approximate <br /> Diameter ( Inches) Wall Thickness Total Length <br /> (casing O. D ./ LD./ coupling O .D.) Inches Feet <br /> 16 .0*/14 .0/ 17 .4 * 1 . 0 * 400 <br /> * Based on SDR 17 rating <br /> 2 . 7 Centralizers : <br /> 2 . 7 . 1 All well casing shall be fitted with Haliburton-type centralizers or <br /> equivalent positioned at 0, 90, 180, and 270 degrees. The <br /> CASING <br /> 02080-2 <br /> C:\DOCUME— I \mikeh\LOCALS—I \Temp\Temporary Directory 15 for IRC wells Div Lzip\07-TRC_Casing.doc <br /> 10/17/07 <br />