(a) Plans. Any sanitary sewer which is to become part of or be connected to
the Municipal sewer system shall be constructed with a plan and profile prepared by a Professional Engineer, registered to practice engineering in the State of Ohio.
(1) Sanitary sewers shall be approved in accordance with the order of acceptance policy of the Municipality before any construction shall be started. Two complete sets of plans shall be submitted for approval. Sewer plans shall show the location of the sewer, size, rate of grade, and any other features affecting the construction of the sewer. The minimum size of sewers shall be eight inches in diameter. Larger sewers will be required where necessary to properly serve an area to be sewered now or at a future time. Lateral connections for houses or any other establishments shall have as a minimum size six inches diameter with four Cast Iron or or Schedule 40 P.V.C. A.S.T.M. 2665 through the footer.
(2) Manholes shall be placed at all changes in alignment or grade and at intervals not exceeding 350 feet.
(b) Specifications.
(1) Materials. All sewers shall be of extra strength vitrified clay, A.S.T.M. C-700, joints C-425-70, polyvinyl chloride A.S.T.M. 3034 PVC Residential areas only or cast iron pipe. All sewer pipe and specials shall meet the requirements of the American Society of Testing Materials latest revisions of Standard Specifications and the Ohio Environmental Protection Agency.
(2) Service lines. Wyes or tees shall be inserted in the collection main for house connections. One connection shall be provided for each lot. Unless required otherwise by the drawings, service lines from the property line to the collection sewer shall be at a minimum depth of three feet at the property line and shall be laid in a straight alignment and uniform slope of not less than one-eighth inch per foot for six inch pipe. All caps and plugs shall be braced, staked, anchored, wired on, or otherwise secured to the pipe to prevent leakage under the maximum anticipated thrust from internal abnormal operating conditions or test pressures from air.
(3) Manholes. Manholes shall be precast reinforced concrete. Details of manhole construction shall be shown on the drawings for walls, bottoms, tops, castings, ladders, and drop structures. Manhole frames and covers shall be of cast iron and of a size and weight suitable for use on highways or in special instances, of lock type assembly with inner lid. The use of cement block or brick shall not be permitted. Manholes shall be sealed against any leakage from outside ground water and graded so no surface water can enter. Precast concrete manholes shall be constructed on a concrete base not less than eight inches thick. Joints in the manhole wall shall be in accord with the manufacturers recommendation. The bottoms of all manholes shall be constructed to provide a smooth channel with pipe or concrete. If pipe is used the top of the pipe shall be cut out to provide full pipe diameter access to the sewer. Where the pipe enters the manhole, special care shall be taken to seal the space between the manhole and the pipe.
(4) Construction. All sewers shall be constructed to the line and grade shown on the approved plans. Pipe shall be laid to line and grade by use of laser beam or by use of batter boards erected at intervals of twenty- five feet.
(5) Trench excavations. Trenches shall be excavated to a width that will provide adequate working space, but not more than the maximum design width. (Pipe diameter plus two feet). Trenches below the pipe invert shall be excavated a sufficient distance to provide space for the pipe bedding. Carry trenches below the bottom of the pipe at least one-fourth of the outside diameter of the pipe, or four inches shall be excavated whichever is greater. The space beneath the pipe shall be refilled with bedding material as specified for Class B or Class C bedding. Bell holes at each joint shall be excavated to provide full-length barrel support of the pipe and prevent point loading at the bells or couplings.
(6) Bedding. All pipe that will become the responsibility of the Municipality shall be bedded in accordance with this section. Three acceptable types of bedding according to the latest ASTM Standards are Class A Concrete Cradle; Class B Arch; Class C, Minimum Bedding. Bedding shall be carefully prepared so that the pipe, after installation, will be true to line and grade and provide a uniform and continuous support beneath the pipe at all points beneath the bell holes or pipe joints. Fill material beneath the pipe shall be densed after each pipe has been brought to grade, aligned and placed in final position, bedding material shall be de posited and densed under the pipe haunches and on each side of the pipe to hold the pipe in proper position during subsequent pipe jointing bedding and backfill operations.
(7) Backfill. Initial backfill shall be completed to a point twelve inches above the pipe using material free of rock, stones, brush or other deleterious material with no stones bigger than one and one-half inch. At least thirty inches of cover over top of pipe shall be placed before the trench is wheel loaded. Except for unusual circumstances, no water shall be permitted to rise in unbackfilled trenches after the pipe is in place. The remainder of the trench shall be carefully back filled to the original ground elevation and condition.
Unless otherwise required, where the sewer is located under an existing pavement, or future pavement, streets, drives, curbs, walks, and other surface construction, the backfill shall be bedding material, sand, tamped earth, slag, gravel or other approved material to the full depth of the subgrade of the surface construction. This backfill material shall be tamped in uniform layers by use of a mechanical tamper and shall have a moisture content that will ensure that maximum density will be obtained with the placement method used.
(Ord. 0-26-1978. Passed 7-17-78.)