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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 />END OF SECTION <br />02531- 4 <br />02531 — Gravity Sewer Manholes <br />