Laserfiche WebLink
CITY OF SANTA ANA <br />SPECIFICATIONS <br />PROJECT NO. 11 -6416 <br />SEVENTEENTH STREET WATER MAIN IMPROVEMENTS <br />JACKED AND BORED STEEL CASING <br />Bore hole diameter shall not exceed outside diameter of casing by more than one (1) inch. <br />When unstable soil conditions are found to exist, conduct boring operations in a manner that <br />will not be detrimental to facility being crossed. Horizontal line tolerance is two (2) inches, <br />maximum. Vertical line tolerance is two (2) inches, maximum. A means of steering the pipe <br />or casing must be provided to ensure allowable tolerances will not be exceeded. The <br />contractor must measure and record progress at all times to confirm that horizontal and <br />vertical lines are within allowable tolerances. For casing: Weld sections of casing pipe <br />together to provide water tight joints by operators qualified in accordance with the American <br />Welding Society Standard Procedures. These welds shall be continuous, complete joint <br />penetration butt joint welds as required for rigid and watertight connections. If the removal <br />of casing is permitted, make proper provisions to prevent caving in of the earth surrounding <br />the casing. If it is necessary to abandon a bored hole, remedial measures shall be taken by the <br />contractor, subject to review by the Engineer. If required grade tolerance has not been <br />achieved, corrections in grade are to be made using casing spacers of varying height per <br />manufacturer's recommendations. <br />MONITORING OF SURFACE MOVEMENT <br />Perform a preconstruction survey of road surface and landscaped median. Contractor shall <br />record horizontal coordinates and elevations. Document location of recorded measurements. <br />Monitor movement of road surface and landscaped median on a daily basis and provide <br />results to the Engineer. Stop operations if movement exceeds % inch and immediately notify <br />the Engineer. <br />GROUTING JACKED AND BORED STEEL CASING <br />Overcutting in excess of one (1) inch shall be remedied by pressure grouting the entire length <br />of the installation. Should appreciable loss of ground occur during jacking or boring <br />operations, contractor shall backpack all voids promptly. Fill all remaining voids upon <br />completion of operations: such filling or backpacking shall be with grout unless otherwise <br />approved. <br />CARRIER PIPE INSTALLATION <br />Entire length of casing shall be installed complete, inspected, and approved by Engineer <br />before any carrier pipe is placed therein. Repair defects in casing pipe or leakage at joints. <br />Casing spacers shall be installed per manufacturer's recommendations and in such a manner <br />that electrical continuity will not occur between casing pipe and carrier pipe. Check each joint <br />makeup and pipe segment prior to pushing carrier pipe segments into casing. Carrier pipe <br />shall be PVC pipe, mechanical joint with restraints. Casing end seals shall be provided at the <br />end of the casing pipe after installation of the carrier pipe. Casing end seals shall be installed <br />per manufacturer's recommendations. <br />T -3n <br />23A -109 <br />