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Inspection of the internal pipe and at existing butt joints. This can <br />be accomplished when necessary excavation, cutting and <br />installation of the poly pig launching assembly at the upstream <br />end, and installation of the flushing assembly at the down stream <br />end of the pipe is commenced. The pipe shall be cut near an <br />existing butt joint, so both the internal wall and joint of the pipe can <br />be evaluated. <br />the presence of scale, grit or other foreign material shall be <br />documented via field notes, photographs, and specimens scraped <br />or otherwise removed from the wall and joint of the pipe and <br />samples shall be laboratory tested to determine its chemical and <br />biological constituents. The lab test results shall be evaluated and <br />provided to IRC and the engineer. <br />b• Clean the main - The contractor shall evaluate the internal <br />condition, residue / scale found, lab samples provided, and <br />recommend the type and frequency of poly pigs to be <br />incorporated into the system, and other cleaning methods that <br />may be necessary. <br />the existing main shall be cleaned of all contaminants prior to <br />bacteriological evaluation with the use of the controlled and <br />pressurized passage through the pipe with a series of hydraulic or <br />pneumatic poly urethane plugs of varying dimensions, coatings <br />and densities. (poly pigs). <br />e <br />the type and size of the poly pigs shall be that which will thoroughly o <br />clean the pipe of all material, sand, grit, gravel, stones, fluids, debri, threats to <br />sanitation, and other items that could generally be construed as foreign <br />material and that which would not be found in a properly cleaned system. <br />The cleaning shall provide a smooth interior periphery of the pipe and will <br />end result in a pipe virtually free of any material and fluids. <br />Poly Pigs are available with abrasive qualities, brushes, and <br />coatings. The type and frequency of use shall be determined in the <br />field based on an evaluation of the pipe interior. <br />The pipe shall be flushed of all contaminants by the utility <br />contractor. <br />02001-4 <br />