Chapter 4.10
SPECIFICATIONS
Sections:
4.10.010 Lateral and house sewers.
4.10.010 Lateral and house sewers.
A. Material. Lateral sewers shall be constructed of vitrified clay or cast iron or polyvinyl chloride (PVC).
B. House sewers shall be constructed of vitrified clay, cast iron, polyvinyl chloride (PVC), bituminized fiber pipe, cement-asbestos mixture pipe such as Johns-Manville Company Transite asbestos-cement house connection pipe, or acrylonitrile butadiene styrene (ABS) drain waste and vent pipe conforming to International Association of Plumbing and Mechanical Officials’ Standard PS 17-65 and installed in accordance with IAPMO Standard IS 5-65. (Ord. 13, 1993; Ord. 4, 1967; Ord. 1 § 20, 1957)
4.10.020 Sewer pipe.
A. Vitrified clay sewer pipe shall conform to the standard specifications of the American Society for Testing Materials, Serial Designation C-l3-50T with subsequent amendments, with the exception that it need not be salt glazed.
B. Cast iron pipe shall conform to the standard specifications of the ASTM Serial Designation A72-42, or equal.
C. Bituminized-fiber pipe shall conform to U.S. Department of Commerce Commercial Standard CS118-54, “Bituminized-Fibre Drain and Sewer Pipe.”
D. Asbestos-cement pipe shall conform to the Johns-Manville Standard Specifications for Transite asbestos-cement house connection pipe with Ring-Tite couplings.
E. Acrylonitrile butadiene styrene (ABS) drain waste and vent piping shall conform to International Association of Plumbing and Mechanical Officials’ Standard PS-17-71 and installed in accordance with IAPMO Standard IS-5-77.
F. Polyvinyl chloride (PVC) sewer pipe shall conform to ASTM 3034 and Installation Standards UPC IS l. (Ord. 10, 1983; Ord. 1 § 21, 1957)
4.10.030 Installation.
A. The bottom of the pipe trench shall provide a firm full length bearing for the pipe between connections, with holes excavated to relieve the stresses caused by the joint connection.
Joints for cast iron pipe shall be made with pure lead poured in accordance with commonly accepted standards.
Joints in other types of pipe shall be made in accordance with manufacturers’ recommendations and with commonly accepted standards.
B. Pipe laying shall proceed upgrade with bell end forward.
Utilities and culverts both private and public shall be protected from damage and maintained in service.
C. Wye Branches. The location of tees or wyes in the collection system can be obtained from the engineer or his local representative. Collecting lines in the street shall not be tapped for a lateral unless a tee or wye has not been provided. Where no such tee or wye exists, connection to the collection sewer shall be made by means of a tee or wye saddle under the supervision and in the presence of the inspector. Damage to this collection system shall be repaired by the responsible party to the satisfaction of the inspector.
D. Grades. The pipe shall be laid on an even grade when practicable. Abrupt changes in grade shall be made by using curved pipe.
E. Minimum cover for lateral sewers shall be 30 inches measured from the top of the pipe to street grade.
F. Size. The size of pipes for lateral sewers shall be determined by the principles of hydraulics but in no case shall it be less than four inches inside diameter. The size of pipe for house sewers shall be determined by the principles of hydraulics but in no case less than the size of the house drain pipes.
G. Cleanouts. Cleanouts shall be placed in every house sewer at the junction with the soil pipe at the building, and at intervals of not to exceed 100 feet in straight runs. When a house sewer branch thereof does not exceed 10 feet in length and is a straight line projection from a house drain which is provided with a cleanout, no cleanout will be required at its point of connection to the house drain.
Every change in alignment or grade in excess of 22-1/2 degrees in a house sewer shall be served by a cleanout, except that no cleanout shall be required for not to exceed one 45-degree change of direction or one 45-degree offset.
Each cleanout shall be installed so that it opens in a direction opposite to the flow of the soil or waste or at right angles thereto, and except in the case of wye branch and end of line cleanouts vertically above the flow line of the pipe.
H. In all new installations to buildings and in all existing installations to buildings where the outlet of a trap for a plumbing fixture is installed or located at an elevation which is less than two feet from the rim of the nearest manhole uphill from the point of connection of the house sewer to the lateral sewer, approved types of trap, vent, and cleanout shall be installed in the house sewer at a point as close as possible to the building being served.
The installation shall consist of an approved cast iron fresh air inlet “P” trap and a wye branch or combination fitting installed in sequence in the line of flow from the building. The vent from this fresh air inlet shall be of cast iron and shall be piped to the ground surface and capped with a cast iron vent cap. This vent cap shall be rigidly fastened in place by means of set screws and shall provide one-half-inch minimum clearance between the cap and end of the riser pipe. Provisions shall be made by elevation above ground or by other means for preventing the obstruction of the vent opening or the flow of water therein. Traps shall be cast iron and of a type approved by the inspector. The cleanout shall be placed as close to the trap as is practical and shall be piped to within one foot of the ground surface with cast iron pipe and closed with an approved cleanout plug.
In lieu of the above, an aluminum back-water overflow device with four-inch plastic two-way cleanout or four-inch cast iron two-way cleanout may be installed, or in lieu of a two-way cleanout a combination wye and one-eighth bend with cleanout plug brought to grade may be installed, provided the main building drain is in a straight line with an exterior cleanout plug at grade on the opposite end of the main building drain line.
Every existing installation which includes a plumbing fixture trap outlet which is less than two feet from the rim of the nearest manhole uphill from the point of connection of the house sewer to the lateral sewer is hereby declared to be dangerous, insanitary, and a menace to life, health and property. Whenever it shall come to the attention of the inspector that such an installation exists, he is hereby authorized and empowered to order and require that such plumbing outlet be immediately plugged or capped or that the equipment described in the preceding paragraphs in this section be installed immediately.
In no case shall a back-water valve be used in lieu of the vent and trap specified above without the express written permission of the inspector. A cleanout shall be installed in the sewer immediately after any such back-water valve permitted by the inspector. Back-water valves required by this section shall be located where they will be readily and easily accessible for inspection and repair at all times, and unless continuously exposed, shall be enclosed in a water-tight masonry pit fitted with an adequately sized removable cover.
I. Separate Sewers. Each parcel of land shall be separately and independently connected with the collecting sewer.
J. Backfilling. No backfill shall be placed until sewer has been inspected and approved by the authorized representative of the district. Selected backfill shall be carefully placed and thoroughly tamped for a minimum of one foot above the pipe. (Ord. 10, 1983; Ord. 7, 1971; Ord. 2, 1958; Ord. 1 § 22, 1957)