Sanitary sewer facilities shall be provided to adequately service the subdivision and conform with the city’s Master Sanitary Sewer Plan.
(A) All sewer pipes may be vitrified clay sewer pipe and shall be extra strength, conforming to ASTM C700 (Latest Revision) or cement-lines bituminous coated ductile iron pipe or polyethylene lined ductile iron pipe.
(B) Polyvinyl chloride (PVC) pipe shall conform to the specifications of ASTM D 3034, SDR 35 and shall be green in color. Joints for the PVC pipe and fittings shall be compression rubber gasket joints. The bell shall consist of an integral wall section with factory installed ring securely locked in bell groove to provide positive seal under all installation conditions. Fittings and accessories shall be manufactured and furnished by the pipe supplier or approved equal and have bell and/or spigot configuration identical to that of the pipe. Connections shall be made with a fabricated fitting. Field glued connections are not allowed. When PVC pipe passes through a manhole wall, asbestos cement sleeves with a rubber ring joint will be used to provide a positive water tight connection.
(C) Polyvinyl chloride (PVC) pipe special embedment.
(1) PVC pipe shall be place on a four-inch layer of crushed rock or rounded gravel bedding material. The trench shall be backfilled with a minimum of six inches of sand on the sides and 12 inches (loose) over the top of the pipe and consolidated to a minimum of 90% standard Proctor density. This is basic-Class “B”embedment as defined by the ASCE Manual No. 37 and AWWA C900-75 and ASTMD2321 with 5% maximum Mandrell Test to be performed. Final backfill is to conform to § S.4.17.
(2) The Class “B” embedment material is further defined as follows:
(a) Ninety-five percent of material pass three-fourths-inch screen; and
(b) Ninety-five percent of material retained on No. 4 screen.
(D) Six-inch lines will be acceptable only on short lines and in the locations where so approved by the city.
(E) All vitrified clay sanitary sewer pipe joints shall be of the pre-molded type conforming to ASTM Designation C425.
(F) Wherever possible, sewers shall be located in the alleys or easements and shall be five feet to six and one-half feet deep to invert.
(G) Grades and appurtenances of sanitary sewers shall conform to the requirements of the State Department of Health Resources. The following are the minimum slopes which should be provided; however, slopes greater than these are desirable:
Sewer Size | Minimum Slope in Feet Per 100 Feet |
Sewer Size | Minimum Slope in Feet Per 100 Feet |
6 inches | 0.50 |
8 inches | 0.40 |
10 inches | 0.28 |
12 inches | 0.22 |
15 inches | 0.15 |
18 inches | 0.12 |
21 inches | 0.10 |
24 inches | 0.08 |
27 inches | 0.067 |
30 inches | 0.058 |
36 inches | 0.046 |
(H) Prior to the acceptance, the sanitary sewers shall be subject to leakage test. The leakage outward or inward (exfiltration or infiltration) shall not exceed 200 gallons per inch of the pipe diameter per mile per day for any section of the system. The use of a television camera or other visual methods for inspection prior to placing the sewer in service is recommended.
(I) All lift stations shall be designated and constructed with two or more sewage pumps with total capacity of twice the design maximum flow. Detailed design data, plans and specifications of the pumps shall be submitted to the City Engineer prior to the purchase and installation of the pumps.
(J) Force mains.
(1) All force mains shall be cast iron pipe, Class 150, unless otherwise specified, with rubber gasket joint, and shall have a cement mortar lining of the “Enameline” type or approved equal.
(2) At design average flow, a cleansing velocity of at least two feet per second shall be maintained. An automatic air relief valve shall be placed at high points in the force main to prevent air locking.
(Ord. 459, passed 12-17-1985)