pf_01916 - Laserfiche WebLink

Home

SECTION 02665 WATER SYSTEM D. After compaction of backfill is completed, the contractor shall regrade the areas disturbed by his operations to the elevations existing or as directed on the Drawings or by the Surveyor. E. Compaction shall be completed in accordance with Section 02200, Earthwork. 3.05 SETTING HYDRANTS, VALVES AND VALVE BOXES A. Hydrants, gate valves and valve boxes shall be set plumb with valve boxes placed directly over valves. Top of valve boxes shall be set 3/4"below finished grade unless otherwise noted on the Drawings. B. Valves shall be installed over four cubic feet of crushed stone or coarse gravel to insure drainage. Hydrants shall be set at such elevations that the connecting pipe will have a minimum of 1'-0" cover or as shown on the Drawings. Each hydrant shall be placed upon a slab of stone, brick or concrete not less than 4" thick and 15" square. The back side of the hydrant opposite the pipe connection shall be firmly wedged against the vertical face of the trench to prevent the hydrant from blowing off the line. Around the base of each hydrant shall be placed not less than seven cubic feet of crushed stone or coarse gravel to insure complete drainage of the hydrant when closed. 3.06 STERILIZATION A. The Contractor shall provide all the materials and labor necessary for the introduction of the proper amount (see table) of chlorine solution directly into the mains after installation and all pressure tests are completed. The use of chlorine solution placed at each joint prior to jointing will not be allowed. Only fresh disinfectants shall be used. The chlorine solution shall be left in the section of pipe being disinfected a minimum of twenty-four (24) hours. The disinfecting shall not commence more than fifteen (15) days before the residents are allowed to hook up to the system. Prior to disinfecting, the mains shall be thoroughly flushed. The mains must be flushed no later than one week after the disinfectant has been added. After the chlorine mixture has been in the mains the proper amount of time, the mains shall again be flushed and a "free chlorine" test shall be made. If more than 1.0 ppm of free chlorine is detected, the lines shall be flushed again in order to reduce the free chlorine residual. If it is determined that the free chlorine i, greater than 1.0 ppm in the system which the new line was connected, the free chlorine residual mall n^' be allowed to exceed that which occurs in the existing system. 0 KKE1186