Sanitary sewers and appurtenances shall be constructed to the following minimum standards:
(A) Sewers.
(1) Materials.
(a) Sewers installed in trenches 9'-0" or less in depth shall be standard strength bell and spigot clay sewer pipe meeting the requirements of AIM Designation C-13 Standard Strength Clay Sewer Pipe.
(b) Sewers installed in trenches more than 9'-O" in depth shall be extra strength bell and spigot clay sewer pipe meeting the requirements of AIM Designation C20D extra strength clay pipe.
(c) All bell and spigot joints shall be of the plastic preformed compression type meeting the requirements of AIM Designation C-425 Vitrified Clay pipe joints using materials having resilient properties.
(2) Installation.
(a) All sewers shall be installed according to the requirements of ASH Designation C-12 Recommended Practice for Installing Clay Sewer Pipe.
(b) The backfill on all sewer lines that lie within the right-of-way of any street or alley shall be pit run gravel.
(c) Existing surfaces shall be placed back in their original condition subject to the approval of the Village Engineer.
(d) All service laterals and extensions for future sewer extension shall be installed within the limits of the right-of-way.
(e) A final plan showing the dimensions to all laterals from the closest downstream manhole shall be furnished to the village upon completion of the project. A four-foot steel fence post shall be buried flush with the ground at the end of each lateral. All dead end laterals are to be properly plugged.
(B) Manholes.
(1) All manholes shall be constructed of precast concrete, cast in place concrete brick or concrete barrel blocks. All manholes shall have a minimum inside diameter of 4'-0". The upper 3'-0" more or less of the manhole shall be tapered so that the inside diameter at the top is 2'-0".
(2) The bottom of all manholes shall be of cast in piece concrete having a minimum thickness of 8" and shall have proper channels formed conforming to the bottom half of the pipe in order to properly carry the sewage.
(3) The joints of all precast concrete manholes shall be properly sealed with mortar both inside and out. Precast concrete units shall have a minimum wall thickness of 5" with proper amount of reinforcement conforming to A.S.T.M. Designation C76 Class II.
(4) All manholes constructed of brick or precast concrete barrel blocks shall have a minimum nominal thickness of 8" and shall have both the inside and outside parged with a ¾" coat of portland cement plaster.
(5) Manhole covers shall be of gray cast iron equal to Treaty Company No. 14-C Frame and cover.
(6) Manhole steps shall be of cast iron equal to Treaty Co. No. 15, placed at intervals not exceeding 12" in height and in a reasonably straight vertical line.
(7) The tops of all manhole covers shall be placed flush with the surrounding surface unless directed otherwise by the Village Engineer.
(8) Manholes shall be placed at all changes in vertical or horizontal alignment, at a change in size of pipe, at the junction, of two or more sewer lines any two of which are six inches or more in diameter, at the ends of all main lines, and at intervals not to exceed 300 feet.
(C) Exfiltration test.
(1) Before any sewer line is placed into service or accepted by the village it shall be subjected to and pass an exfiltration test.
(2) Each run between manholes shall be tested before being accepted.
(3) The exfiltration test shall be conducted in such a manner that when a four-foot head of water is placed above the pipe in the upstream manhole, the losses in the stretch of pipe and manhole being tested shall not exceed 750 gallons per day per inch of diameter per mile of pipe.
(D) Gradient.
(1) All sewers shall be installed at a gradient that will induce a minimum rate of flow of two feet per second. The following minimum grades will satisfy this condition.
Diameter in inches | Minimum fall, feet |
Diameter in inches | Minimum fall, feet |
4 | 1.00 |
5 | 0.80 |
6 | 0.60 |
8 | 0.40 |
10 | 0.29 |
12 | 0.22 |
15 | 0.15 |
18 | 0.12 |
21 | 0.10 |
24 | 0.08 |
(2) A four-inch sewer will be the minimum size of lateral allowed. All main line sewers shall be at least eight inches in diameter.
(E) Flush tanks. Wherever it becomes advisable to use a gradient less than that prescribed in division (D) above, a flush tank will be required at the end of this line. Flush tanks shall be installed in a standard manhole. The flush tank shall be constructed and installed according to the requirements of the Miller Standard design Siphon. The water from the village main shall be introduced into the flush tank by using a P.F.T. Flush tank regulator. The size of the siphon and regulator shall be such that they will automatically flush the line approximately once every 24 hours.
(F) Lift stations. Lift stations where required shall be installed by the subdivider. Where flows of less than 200 gpm are to be handled the lift station shall be of the pneumatic ejector type equal to the “Expelsor” as manufactured by the Yeoman Bros. Co. Where flows exceeding 200 gpm are to be handled the lift station may be of either the pneumatic ejector type or the vertical centrifugal pump type. Where the vertical centrifugal pump type lift station is installed a duplex installation shall be placed in service initially. Where the pneumatic ejector type are installed provisions shall be made to have a second unit installed in the pit at a future date.
(Ord. 1961-35, passed 6-13-61)