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L <br /> L <br /> 3 .05 Bedding and Backfill <br /> Except for additional foundation rock as indicated above, each manhole shall be bedded and <br /> backfilled in accordance with the specification for "Gravity Sewer Piping" . Density tests shall be <br /> taken at each manhole structure installed on the project. <br /> 3 .06 Inverts <br /> Invert channels shall be constructed smooth and semi-circular in shape conforming to the inside of <br /> adjacent sewer sections . Changes in direction of flow shall be made in a smooth curve of as large a <br /> radius as possible. Changes in size and grade of channels shall be made gradually and evenly. <br /> Invert channels shall be formed by one of the following methods : <br /> A. Form directly into concrete manhole base . <br /> B . Lay half tile in concrete. <br /> C . The Manhole floor outside of channels shall be made smooth and sloped toward channels . <br /> 3 . 07 Field Quality Control <br /> Testing - Tests for water tightness shall be made by the Contractor in the presence of the Engineer. <br /> The tests and measurement of infiltration/exfiltration shall be conducted in a manner as accepted <br /> �y and approved by the Engineer. All visable leakage shall be plugged and repaired by the Contractor. <br /> L <br /> END OF SECTION <br /> r <br /> �L <br /> 02531 — Gravity Sewer Manholes <br /> 02531 - 4 <br /> �r <br /> 60 <br />