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11 d made daily and continuously until two successive examinations are found satisfactory. Should three examinations be found unsatisfactory, the line shall be flushed and disinfected again. Certified copies of all laboratory analyses shall be provided to the Owner. The cost of all sampling, flushing, and disinfecting shall be included in the contract price, and no additional charge shall be made to the Owner for this work. County personnel shall operate all valves and be present to determine and control f the volume of water used for flushing. f j TABLE 1-1 Chlorine Required to Produce 25-mg/L Concentration In 100 Ft. of Pipe by Diameter Pipe 100 -percent l -percent Diameter Chlorine Chlorine Solation (inches) oundo (gallons) 4 0.+013 0.16 6 0.030 0.36 8 0.054 0.65 10 0.085 1.02 12 0.120 1.44 16 0.217 2.60 1.03 TESTING OF GRAVITY SEWERS A. Leakage tests by exfiltration or infiltration, as described below will be made on all pipe. The County shall have the option of determining which test shall be employed. Generally, if the groundwater table is below the bottom of the pipe, an exfiltration test shall be used. B. Exfiltration tests will be made on the pipe before or after backfilling, at the discretion of the County. The length of the sewer to be tested shall be such that the head over the crown of the upstream end is not less than 2 feet, and the licad over the downstream crown is not more than 6 feet, unless directed otherwise by the County. The sewer shall be plugged by pneumatic bags or mechanical plugs in such a manner that the air can be released from the sewer while it is being filled with water. The test shall . be continued for one !Sour and provisions shall be made for measuring the amount of water required to maintain the water at a constant level during this period. If test results are unsatisfactory, the Engineer may direct that additional tests are made on any or all of the pipe. 02660-3