(A) Gravity sewers.
(1) Gravity sewer mains with diameters of eight inches through 15 inches shall be SDR-35, meeting or exceeding all the requirements of ASTM D 3034. Pipe diameters greater than 15 inches shall meet or exceed all requirements of ASTM F 679.
(2) Pipe joints shall have a bell wall, gasket groove, and spigot which are integral with the pipe. The assembly of joints shall be in accordance with pipe manufacturer recommendations and ASTM D 3212.
(3) Pipe fittings shall be SDR 26 manufactured fittings made of PVC. Saddle connections shall not be allowed for new construction. Lateral connections shall occur at SDR 26 Wyes.
(4) Each pipe section shall be marked with the name of manufacturer, trademark or trade name, nominal pipe size, production/extrusion code, material and cell classification, and ASTM number.
(5) Installation shall be in accordance with ASTM recommended practice D 2321.
(6) Unless otherwise authorized by the Utility Director all sewer pipes shall be PVC. Other types may be used only under special circumstances, and only with the approval of the Utility Director or their designee.
(B) Manholes.
(1) Precast concrete manholes shall conform to ASTM C 478 with cast iron rung or plastic steel re-enforced steps. Monolithic cast-in-place or 'doghouse-type' manholes shall only be used with the prior written approval by the Utility Director or their designee. The base and first riser section of the precast concrete manhole shall be integrally cast as one unit. Precast concrete cones shall be of the eccentric cone type.
(2) Where a single solid riser or barrel section cannot be used, final adjustment in elevation of the frame and cover shall be accomplished by the use of a four-inch minimum thickness adjusting ring to a maximum combined thickness of 12 inches. Brick or block shall not be used in the construction of a manhole or to adjust the elevation of the frame and cover. The risers shall be rated to AASHTO load requirements. Situations that require a riser thickness of less than four inches will be approved on a case-by-case basis. Non-hardening butyl rubber sealant shall be installed between cones, riser rings, and castings.
(3) Chimney seals conforming to Cretex internal chimney seal standards shall be installed in all manholes along with a manhole dish.
(4) A six-inch minimum width of butyl rubber coating on the exterior of the manhole shall be applied at each joint to prevent leakage.
(5) Precast flow channels through manholes shall be U-shaped at a minimum width and depth equal to the diameter of the pipe extending between the pipe inverts. The bench walls must extend up from the flow channel to an elevation that creates a one inch per one foot minimum slope with the inner wall of the manhole section.
(6) Manhole covers shall be cast iron conforming to Neenah Foundry Company #R107-A with Type "B" self-sealing, machined lid or comparable HOE of Kentucky casting. Casting shall be stamped "TOWN OF CLARKSVILLE SANITARY SEWER".
(7) All sanitary manholes adjacent to a stream, swale, or open storm channel shall have locking or bolt down lids with an inside seal between the lid and casting. Sanitary manholes are not permitted to be located within a stream, flow line of a swale, or open storm channel.
(8) All manholes must be constructed of, or coated in, an approved non-corrosive material.
(C) Building laterals.
(1) Pipe for residential building laterals shall be a minimum four-inch diameter PVC from the house to the property line and six- inch diameter PVC from the property line to the sewer main meeting the requirements of ASTM D3034, SDR35.
(2) Commercial lateral connections shall be six-inch diameter PVC meeting the requirements of ASTM D3034, SDR35.
(3) Pipe shall have a flexible gasket push-on compression type joint. SDR 35 glue joint pipe may be used on a case-by-case basis with the approval of the Utility Director or their designee.
(4) Pipe must be laid with the male end of the pipe connecting to the female end in the direction of the flow.
(5) Cleanouts are to be located a minimum of every 75 feet for four-inch diameter sized pipe, and every 100 feet for six-inch diameter pipe or at any change in direction (i.e., at any 45 degree or 22.5 degree elbow).
(Ord. 2020-SW-02, passed 3-3-20) Penalty, see § 51.999