(A) Gravity sewers.
(1) All gravity sewer pipes and sewer laterals shall be firmly bedded on no less than four inches of INDOT #11 crushed stone according to ASTM C-12 (latest revision) and covered with no less than 12 inches of the same material.
(2) Where a gravity sewer to be constructed in an earthen area is not to receive gravel or other types of pavement, the remainder of the trench shall be backfilled with selected earthen material, and a slight mound shall be left on top of the trench to allow for settlement.
(3) Where a gravity sewer is to be constructed in an earthen area is to receive gravel or other types of pavement, the remainder of the trench shall be filled with a fine graded, compacted crushed stone to the sub-grade of the pavement section.
(4) Where a gravity sewer is constructed in an existing gravel area, the top 12 inches of the trench shall be filled with Dense Aggregate Grade (DGA), and graded and compacted to the grade of the surrounding area.
(5) Where a gravity sewer is to be constructed in an existing asphalt pavement area, the top of the trench shall be trimmed back six inches along both sides with nine inches of 3000-PSI concrete poured to a point one inch below surrounding pavement grade. After all construction of sewer has been completed, the trench shall be cleaned, primed with asphaltic primer L, and paved with compacted ISHC asphaltic concrete, type "B" to a smooth, flush grade with the surrounding pavement.
(6) Where a gravity sewer is to be constructed in an existing concrete pavement area, the top of the trench shall be trimmed back six inches along both sides with nine inches of 3000 PSI concrete poured flush with the surrounding pavement grade and finished with a brushed surface. Concrete trench pavement shall be barricaded or protected with steel plates for at least one week before vehicular traffic is allowed travel over it.
(7) All cutting of sewer trenches in existing asphalt or concrete paved areas shall be done only with a rotary power saw to provide a straight, smooth joint when new pavement is placed.
(8) Where any sewer is installed in a public right-of-way or easement not owned by the persons installing the sewer, all earthen areas disturbed during construction shall be graded and sodded.
(B) Building laterals.
(1) Tight fitting PVC caps shall be installed on the end of each lateral stub. Also, a metallic marker must be placed at the end of each lateral for future locating.
(2) Lateral connections to the mainline sewer must be wye connections; no saddle connections will be allowed.
(3) InsertaTEETM or InsertaWYETM or comparable may be used on a case-by-case basis as approved by the Utility Director or their designee.
(4) No lateral sewer shall directly discharge to a manhole unless approved by the town.
(5) Under no conditions shall sewer laterals be backfilled until the town has inspected and approved all work.
(C) Manholes.
(1) Manholes shall be placed on a minimum 12 inches of INDOT #11 crushed stone that has been mechanically compacted. Where unstable or poor soil conditions exist, the contractor/owner shall have a geotechnical engineer provide recommendations on how to stabilize the unsuitable soil. The remainder of the manhole shall be backfilled using No. 11 stone. Stone shall be placed in six-inch lifts and mechanically compacted to 95% maximum dry density as determined by ASTM D698.
(2) Connections to all manholes, new or existing, shall be core drilled and booted. These taps shall be cored into the manhole between the spring line of the sewer or no more than 24 inches above the flow line. Manhole connections shall not protrude past the interior of the wall of the manhole. All pipe connections to the manhole shall not be grouted.
(3) Drop manholes shall be either precast or cast-in-place exterior drop manholes.
(4) All sanitary manholes shall be vacuum tested with castings per ASTM C 1244 following full installation.
(Ord. 2020-SW-02, passed 3-3-20) Penalty, see § 51.999