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 Smyrna
 Code of Ordinances
 Appendix D. DESIGN SPECIFICATIONS FOR STORM DRAINAGE, ROADS, CONSTRUCTION

  § 6. Sewer mains and service lines.

Latest version.

  • (a)

    Standards for design of sanitary sewer mains and service laterals.

    (1)

    Sanitary sewer mains shall be a minimum of eight inches round. Larger sizes may be required when flow warrants as determined by the city.

    (2)

    Sanitary sewer piping shall be PVC SDR 35 ASTM D 3034 at a maximum depth of 18 feet and a minimum depth of four feet of finish grade; or class 51 ductile iron piping with no depth restrictions.

    (3)

    Sanitary sewer laterals shall be a minimum of six inches round, PVC SDR 35 ASTM D 3034 or class 51 ductile iron piping depending upon depth of cover. Laterals shall extend from sewer main to right-of-way line and have installed a six-inch PVC SDR 35 cleanout stubbed and capped at grade. Lateral locations shall be permanently marked on curb.

    (4)

    Transition joints between sewer pipes of different materials shall be accomplished by the use of approved adaptors.

    (5)

    Sewer piping shall have a minimum of four-inch #57 stone bedding and trench shall be filled to two-third pipe diameter with #57 stone.

    (6)

    Exposed bridge and creek crossings for sewer and water mains shall be accomplished by welded and painted steel encasement with a minimum encasement two pipe sizes larger than the main being encased. Support shall be at ten-foot intervals or closer to keep it in alignment and prevent sagging. The ends of all encasements shall be built on concrete piers.

    (7)

    All sewer piping shall be ductile iron pipe under creek crossings for a distance of ten feet each side of top [of] creek bank.

    (8)

    All manholes require Kor-N-Seal rubber boots. Manholes adjacent to creeks or below floodplain level require watertight frames and covers with vents every 1,000 feet.

    (b)

    Testing for soundness and tightness.

    (1)

    After the sanitary sewer piping has been laid and backfilled, each section of pipeline between manholes shall be tested by a low pressure air test. Each lateral end shall be blocked [and] capped for air tightness. The sewer segment being tested shall be pressured to 3.5 psi. After stabilization, the air pressure within the segment being tested shall not decrease more than 0.5 psi during the time periods below:

    Pipe Size
    (inches)     		Time
     4  1 min., 53 sec.
     6  2 min., 50 sec.
     8  3 min., 47 sec.
    10  4 min., 43 sec.
    12  5 min., 40 sec.
    15  7 min., 05 sec.
    18  8 min., 30 sec.
    21  9 min., 55 sec.
    24 11 min., 20 sec.
    27 12 min., 45 sec.

     

    Should any test on any section of pipeline fail, the contractor shall repair the defect. After the repairs are made the line shall be retested and air loss rate shall be within the specified allowance.

    (2)

    The developer or developer's engineer is responsible for furnishing to the city, as soon as the sewer and water systems have been completed, a set of as-built drawings.

(Ord. of 2-3-92 (92-01))