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SANITARY SEWERS 02 7300-15 cleaning balls. The balls shall be of the appropriate size to fit the sewer pipe being cleaned. Hydroflushing operations shall be conducted by experienced personnel under the observation of the ENGINEER. The ball shall be introduced at the uppermost manhole and passed from manhole to manhole by means of a line with sufficient head of water to carry the ball along. The movement of the ball shall be controlled by a rope; care shall be exercised not to feed the ball too rapidly in order that all debris can be removed at each manhole. C. Each section of the sewer line shall be thoroughly cleaned before proceeding to the next section. Where sewer balls will not pass, flexible sewer rods with approved spears or cutters may be used to clear the obstruction. Where obstructions cannot be cleared by sewer rodding, the obstructions shall be removed by excavation at the CONTRACTOR's expense. The CONTRACTOR shall remove all debris from sewer lines using approved methods. D. Installation cost shall include cost for water for sanitary sewer flushing and cleaning operations. 3.07 COMPACTION TESTING A. Field quality control shall conform to Section 02 2020 of these specifications. 3.08 TESTING SANITARY SEWERS A. Sanitary sewer systems including laterals, and sanitary force mains shall be tested for tightness after completion of all backfilling and prior to request for final inspection. CONTRACTOR shall notify the ENGINEER at least two (2) working days in advance of proposed testing dates. Tests of gravity sewers shall be made from end or manhole to manhole unless grades are flat enough to permit testing two or more sections at one time. Sections which fail to pass the tests shall be repaired or replaced, and the section retested until it falls within specified allowances. B. All water for sanitary sewer testing shall be provided and the tests performed by the CONTRACTOR in conformance with the following requirements: 1. Mandrell Test a. Pipes shall be tested for deflection by passing a mandrel through the pipe without obstruction, except for sections modified herewith. b. The size of the mandrel shall be set at 92.5% of the base inside diameter of the pipe, as defined in ASTM 3034. 2. Water Leakage Test a. Preparation for Test: The sewer line to be tested shall be plugged at the downstream manhole. All openings in the upstream manhole shall be plugged except the downstream opening for the line to be tested. All branch sewers running from wye connections on the mains shall be plugged at their upper ends if the test head would cause them to overflow.