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1 <br /> 1 2 . Minimum wall thickness shall as shown on the Contract Plans , <br /> 3 . Casing pipe shall be furnished with plain ends , mill beveled for field butt welding . <br /> Field welded joints shall be full penetration single-vee groove , butt-type welds <br /> around the entire circumference of the pipe . <br /> ' B . Carrier Pipe : <br /> 1 . The carrier pipe shall be Schedule 40 steel pipe . <br /> tC . Coatings : The exterior and interior surfaces of the casing pipe and carrier pipe shall <br /> receive surface preparation conforming to SSPC-SP6 . One of the following coating <br /> systems shall be applied in the shop : <br /> a . Koppers : <br /> 1 ) Primer: Pug Primer - 1 coat, 1 . 5 dry mils . <br /> 2 ) Finish : Bitumastic 300M - 2 coats , 8- 10 dry mils per coat . <br /> b . Tnemec : <br /> 1 ) Primer: 77 Chem- Prime - 1 coat, 1 . 5 dry mils . <br /> ' 2 ) Finish : Tneme-Tar - 2 coats , 8 . 3 dry mils per coat . <br /> c . Or equalivent . <br /> ' PART 3 - EXECUTION <br /> 3 . 1 GENERAL <br /> A . Installation of the crossings shall be by boring and jacking and shall conform in all <br /> respects to the requirements contained herein and other applicable standards . <br /> ' B . Lines and Grades : Establish and maintain proper line and grade at each crossing . <br /> 1 . Periodically check the line and grade to assure conformance with the line and <br /> grade shown on the Plans and to verify that it is within the tolerances listed in <br /> this Section . <br /> 2 . Extra work required because of the CONTRACTOR's failure to maintain the <br /> proper line and grade as shown on the Plans , shall be performed by the <br /> CONTRACTOR , at no additional cost to the OWNER . <br /> ' 3 . 2 INSPECTION <br /> A . As required by the OWNER , ENGINEER , FEC , or other regulatory authority . <br /> ' 3 . 3 PREPARATION <br /> ' A . Work pits at each end of the crossings shall be sufficiently large to permit satisfactory <br /> installation of the casing pipe . All excavation , backfill , sheeting , shoring , bracing , <br /> t <br /> Last revised 01 /25/2001 02250-4 EAST GIFFORD <br /> ' RIPublic Works\KeithM\Stormweter Projects\Gifford East\Construction Contract\Technical Specifications\Final Specifications\Division <br /> 2\02250 - Crossings by Boring and Jacking .doc <br />