2009-280 - Laserfiche WebLink

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4. The water main shall cross any other utility only with separation criteria in accordance with 62-555.314(2). the existing main does not cross any gravity, force/ pressure, or vacuum type sanitary sewer mains, force/ pressure drainage mains, re-claimed mains. The existing main crosses several existing drainage culverts where it is estimated that there is 12" clearance. However, the plans specify that the contractor shall excavate the main at these locations, and if 12" separation is not found, the water main shall be concrete encased, 4" thick x 10 ft. Long, centered at the crossing. The contractor shall further document the pipe condition during construction at all locations where pipe is to be excavated (connection point, flushing point, fire hydrant cut -ins, conflict locations). Documentation shall include as -built locations of depth, separation from other utilities, photos 0f pipe, markers, etc. All new mains are specified to meet the FDEP separation criteria. The new 16" directional bore crossing 58th Ave will cross several utilities. (See plans and specifications). S. The water main shall be cleaned / flushed, pressure tested, disinfected and bacteriologically evaluated: a• Evaluate the existing pipe condition (pre -cleaning): the existing pipe shall be evaluated prior to cleaning, to determine the internal condition of the pipe. Pre -cleaning evaluation shall include: A permanent sample point shall be installed at the downstream (eastern) end of the existing 16" main. (approx. 1000 ft east of 58th Ave), and a bacteriological evaluation (total coliform analysis)of the brine shall be completed in accordance with 62-555.340 fac, to determine the existence of any bacteriological contamination of the existing pipeline. Evaluation of existing brine concentrate lab sample results. The contractor will be provided results of existing brine concentrate lab samples to assess the possible residue and scale constituents. 02001-3