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' C. If any joint shows an appreciable amount of leakage , the jointing material shall be removed and joint remade . If any pipe is defective, it shall be removed and replaced . If the quantity of water required to maintain a constant level in the sewer for one hour does not exceed 100 gallons per inch of diameter per day per mile of sewer and if all the leakage is not confined to a few joints , the workmanship shall be considered satisfactory. If the amount of leakage indicates defective joints or broken pipes, the Contractor shall correct them. D . Pipe shall be tested for infiltration after the backfill has been placed . Infiltration tests shall be made under the supervision of the Engineer and IRCDUS. The length of line to be tested shall be as directed by the Engineer and/or IRCDUS. The allowable infiltration shall be 100 gallons per inch of diameter per day per mile of sewer. E . Rate of infiltration shall be determined by means of V-notch weirs , pipe ' spigot or by plugs in the end of the pipe, to be provided and installed by the Contractor in an approved manner and at such times and locations as may be directed by the Engineer and/or IRCDUS. F. In an inspection of the completed sewer or any part thereof shows any manholes, pipes or joints that allow the infiltration of water in a noticeable + stream or jet, the defective work or material shall be replaced or repaired , as directed by the Engineer and/or IRCDUS. ,. C . Leakage between two adjacent manholes may be double the amount above stated , provided the average leakage for a total length of any size does not exceed the amount first stated and provided there are not gushing or spurting leaks . M . All water used in testing and flushing shall be furnished at the Contractor's expense. The minimum amount of water to be used is two ' (2) times the volume of the pipe . I . The Contractor may use an air test in lieu of the exfiltration test as described above . If he elects to do this, he shall submit his proposed method to the Engineer and/or IRCDUS for approval . J . If the results of the air test are unsatisfactory, as determined by the County, the Contractor shall be required to perform the exfiltration test as outlined above . s K. AT the conclusion of the work, the Contractor shall thoroughly clean the entire inside of the pipe by flushing with water or other means to remove all dirt, stones, and pieces of wood or other material that may have entered during the construction period . Debris cleaned from the lines shall be removed from the lowest outlet. If, after this outlet cleaning , obstructions remain , they shall be removed . After the pipe is cleaned and ' if the groundwater level is above the pipe, or following a heavy rain , the IRCDUS will examine the pipe for leaks. If defective pipes or joints are discovered at this time, the Contractor shall repair them at his expense . r 10 - 5