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SECTION 5 – WATER WORKS <br />79 <br />Unusual Conditions: When local conditions prevent the prescribed vertical separation, conform to <br />the following: <br />1.Sanitary or storm sewers passing over or under water mains shall be constructed of ductile <br />iron pipe (Thickness Class 50) with mechanical joints or PVC pipe (SDR 26 or SDR 21) <br />as described in parallel installation, unusual conditions. <br />2.Water mains passing over sewer lines shall be laid to provide: <br />a.Vertical separation of at least eighteen (18) inches between top of sewer and <br />bottom of water lines. <br />b.Adequate structural support for the sewers to prevent excessive deflection of the <br />joints, resulting in the breaking of the water line. <br />c.Maximum separation of water and sewer line joints. <br />Sanitary and/or Combined Sewers, Storm Sewers, or Sewer Manholes: No water pipes <br />shall pass through, or come in contact with, any part of a sewer or sewer manhole. <br />5-3.8 BEDDING <br />From the bottom of the excavation to a point one (1) foot above the top of the pipe, bedding material <br />shall be placed as follows: <br />Granular material shall be placed in a loosely measured six (6) inch layer around the pipe. Each layer <br />shall be thoroughly tamped under and around the pipe, and when sufficient layers have been placed in <br />this manner to cover the pipe, the tamping shall proceed across the width of the trench. Hand, <br />pneumatic, or mechanical tampers may be used. The bedding material shall be moist, but not wet, and <br />it shall not include any stones larger than two (2) inches in any dimension. <br />If the native material is not granular and is unsuitable for pipe bedding, INDOT B-Borrow or Structure <br />Backfill Type 1 shall be installed around the pipe in the manner described above. <br />5-3.9 TRENCH BACKFILL <br />Refer to Section 4-4.1 for trench backfill requirements. <br />5-3.10 HYDRANTS <br />Hydrants shall be located per the Water Department Standards Details or as directed by the Water <br />Department. When set between the curb and sidewalk or between the sidewalk and property line, no <br />portion of the hydrant or nozzle cap shall be within six (6) inches of the sidewalk. All hydrants shall <br />stand plumb and shall have their nozzles parallel or at right angles to the curb; pumper nozzles shall <br />face the street. Hydrants shall fit the grade with nozzles at least twelve (12) inches above the ground. <br />Dirt and other foreign matter shall be removed from the hydrants before setting. <br />Each hydrant shall be restrained with mechanical joint fittings per City of South Bend Standard Details.