2008-213 (5) - Laserfiche WebLink

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r L Department of Environmental Protection regarding pollution of waterways . Should the size of Contractor' s dewatering equipment, or the quantity of disposed water, or the method of disposal require a St . Johns ' River Water Mgmt. District permit, the Contractor shall obtain such permit at no additional expense to the Owner and with no additional time added to the Contract. The Contractor shall take special precautions to eliminate any odor problems resulting from the discharge of sulfide water, such as the use of submerged discharge outlets and overflow basins . 8) Preparation of Trench - Trenching as shown on the Plan details shall be standard for this project. The trenches shall be constructed by excavating to the depth indicated on the Plans. The trenches shall then be manually shaped to fit the bell and lower quadrant of the pipe barrel. Mechanical excavation shall be limited to provide an undisturbed trench bottom for the lower quadrant and bell of the pipe . Final excavation shall require hand shaping for placement of the pipe. If mechanical over cutting occurs, the pipe bedding shall consist of four (4) inches of washed and graded sand or crushed rock on undisturbed soil. C . Laving of Pipe All pipe, fittings and valves shall be installed according to AWWA Specification C600 . Prior to installation, all pipe and appurtenances shall be examined for damage and defects. Under no circumstances shall defective pipe be installed. All lumps, blisters and excess coating materials shall be removed from the socket and plain ends of each pipe. While being placed in the trench, care shall be taken to prevent foreign material from entering the pipe. As each length of pipe is placed in the trench, the joint shall be assembled and the pipe brought to correct line and grade . At times when pipe laying is not in progress, the open end of the pipe shall be closed by a watertight plug. When practical, the plug shall remain in place until the trench is pumped completely dry. When it is necessary to deflect the pipe from a straight line in either the vertical or horizontal plane, or where long radius curves are permitted, the amount of deflection shall not exceed that of Table 5 and 6 in AWWA Specification C600. 1 ) Thrust Restraint - All dead ends, valves, tees, and fittings for changes in alignment shall be appropriately restrained against pipeline thrust. All changes in alignment shall require the fitting and appropriate length of upstream and downstream pipe to be mechanically restrained with approved devices . 2) Backfill a. General - Where the trench has been dewatered, backfilling must progress sufficiently before pumps are shut off to prevent flotation of pipe. Any pipe that has been displaced perceptibly from its correct position shall be removed and relaid properly at the Contractor' s expense. Backfilling shall follow pipe laying within 100 feet, unless otherwise directed by the Engineer, but shall not be performed in any case until the Engineer has approved the line for backfilling. Water shall not be added except as required to obtain Optimum Moisture Content and "flooding ' or "puddling" for compaction will not be allowed. Backfill material shall be free of roots, logs, limbs, clays, large rocks or any material or debris determined to be unsuitable by the Engineer. The Engineer may reject any material which he considers unsuitable for backfill. The compaction procedures 02534— Sanitary Sewer Force Mains 02534 - 7