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(a) As used in this chapter:
(1) “Sewage” means the liquid or water carried wastes from residences, business buildings, institutions and industrial establishments together with such ground water, surface water and storm water as may be present.
(2) “Domestic sewage” or “sanitary sewage” means sewage derived principally from dwellings, business building, institutions and the like, which originates within the building, including the wastes from kitchens, water closets, lavatories, bathrooms, showers and laundries.
(3) “Industrial sewage” means the liquid wastes from industrial processes as distinct from domestic sewage.
(4) “Sanitary sewers” means a pipe or conduit designed for the purpose of carrying domestic sewage and industrial sewage from the point of origin to a sewage treatment or disposal works or to a place of disposal, but which is not intended to carry storm, surface, ground or subsurface waters.
(5) “Foundation drains” means subsurface drains laid around the foundation of a building, either within or outside of the building foundation, for the purpose of carrying ground or subsurface water to some point of disposal.
(6) “Building sewer (house connection)” means that part of the sanitary sewerage system which connects the plumbing of the house or building to a common or public sewer. The building sewer begins three feet from and outside the foundation wall.
(7) “Sewerage system” or “sewage works” means all of the facilities for collecting, pumping, treating and disposing of sanitary sewage to and through the sewage treatment or disposal works owned by the City or any additions or extensions thereof.
(b) Y-branches shall be installed during the construction of the collector sewers. If the sewer is located in a street, service extensions shall be made to within one foot of the street right-of-way lines. Where the sewer is more than twelve feet deep, risers shall be included as part of the construction work. Such risers shall be brought to a point not less than ten feet below the ground.
(Ord. C 61-73. Passed 8-6-73.)
(c) Concrete encasement shall be used when required for the sanitary sewer to withstand the trench loadings, when hard shale or rock is encountered in the trench bottom or when the cover over the sewer is less than two and one-half feet.
(Ord. C29-77. Passed 4-18-77.)
(d) Leakage tests are required for all sanitary sewers except building sewers unless a leakage test on a building sewer is requested by the Sewer Inspector. Deflection tests are required for all sewers using PVC pipe.
(1) The sewer shall be tested in sections, each section extending between two consecutive manholes or from the end of the sewer to the nearest manhole. The contractor may elect to use either an infiltration test or an exfiltration test as described herein.
(2) If the infiltration test is selected, each section of pipe shall be covered with not less than two feet of ground water above the top of the pipe at the highest point in the section being tested. The infiltration will be measured by means of a V-notch weir located in the downstream manhole. All service connections and stubs shall be capped or plugged to prevent the entrance of ground water into the line at these connections.
(3) If the exfiltration test is selected, the inlet end of the upstream and downstream manholes shall be closed with watertight bulkheads. Then the sewer and the upsteam manhole shall be filled with water until the elevation of water in the upsteam manhole is two feet higher than the top of the pipe in the line being tested or two feet above the existing ground water in the trench, whichever is the higher elevation. The exfiltration will be measured by determining the amount of water required to maintain the initial water elevation for one hour from the start of the test.
(4) The amount of infiltration or exfiltration as applicable, shall not exceed a rate of 200 gallons per inch of pipe diameter per twenty-four hours per mile of sewer in each and every section tested in accordance with this subsection (d).
(5) The deflection test shall be made by pulling a rigid ball or mandril with a diameter equal to ninety-five percent of the inside diameter of the pipe through the sewer. This test shall be made after the backfilling of the sewer line section being tested is completed.
(e) Building sewers shall be constructed at no expense to the City.
(1) Before any building sewer is constructed, a tap permit must be obtained from the Building Inspector. Such permit will be issued in accordance with the provisions of Chapters 935, 937 and 939. The person applying for a permit shall identify the location of the tap. The person to whom a permit is issued shall cause the building sewer to be installed in accordance with the rules and regulations contained herein. All tap permits shall become null and void ninety days from the date of issuance. No refund of the tap fee shall be made unless a request is filed and the permit returned within the above mentioned ninety days.
(2) All construction or repair of building sewers shall be inspected and approved by the Sewer Inspector after the pipe has been laid and tap completed, but before covering with the backfill.
The person to whom the permit has been issued shall call the Building Inspector requesting the inspection, at least one-half day before the inspection is desired.
(3) The building sewer shall be constructed of a size not less than six inches internal diameter, laid with a minimum fall of one-fourth inch per linear foot, and shall be vitrified clay pipe, ABS Composite, PVC or ductile iron pipe with watertight joists, as specified in Section 1103.02(c)(3), and using proper curves for all changes in alignment or grade. Only adapters approved by the City Engineer shall be used to change from one pipe material to another in any sewer line. The interior of each length of pipe shall be made perfectly clean and free from offsets, fins, and projections before the next length is connected thereto. The Sewer Inspector may, by special permission in each case, authorize the building sewer to be constructed with a fall as little as one-eighth inch per linear foot if he determines such procedure to be desirable. The Sewer Inspector may require that the water tightness of the joints be demonstrated by the testing procedures established in subsection (d) hereof.
(Ord. C 94-73. Passed 12-17-73.)
(4) Old or existing building sewers may be used in connection with new buildings or alterations to existing buildings only when it can be demonstrated that such sewers conform in all respects to the requirements contained herein for new building sewers. The Building Inspector may make an exception as to the size of old building sewers provided they are not less than four inches in internal diameter, and otherwise meet the requirements of this section.
(5) Building sewers shall not be constructed closer than three feet to any exterior wall, cellar, basement or cistern nor shall they have less than two feet of earth or stone cover.
(6) All excavation for building sewers shall be by open cut from the surface. The sides of the trench shall be vertical, using such sheeting and bracing as may be necessary to accomplish this result. The bottom of the excavation shall be shaped to fit the lower half of the sewer pipe so that the pipe will have uniform bearing from end to end. In order to accomplish uniform bearing, adequate bell holes shall be excavated at each joint. In the event the trench is excavated below the required grade of the pipe, the excess space shall be filled with the stone specified for Type I bedding requirements of Section 900 in Table A of Section 1103.02(b). The width of the trench at the top of the pipe shall not exceed two feet plus the outside diameter of the pipe nor shall the width be less then one foot plus the outside diameter of the pipe. When unstable, soft or spongy conditions are encountered at the trench bottom, such material shall be removed and replaced with clean, crushed stone sufficient to stabilize the trench bottom to support the pipe to a true line and grade. Such work shall be performed as directed by the Inspector. Water and gas services shall not be laid in the same trench as the building sewer.
(7) No tap permit shall be issued for a building sewer, the construction of which will require the opening, cutting, barricading or otherwise impeding the normal flow of traffic of any public street, road or alley until there is presented to the City, evidence, in writing, satisfactory to the City, that permission for such opening, cutting, barricading or impeding of traffic has been granted to the applicant from the governmental body having authority to grant such permission. Any tap permit so issued shall be subject to any restrictions or conditions contained in such written expression of permission from the governmental body.
(8) The building sewer shall be backfilled to an elevation at least twelve inches over the top of the pipe by tamping in finely graded soil or granular material in six inch layers. Soil containing stones larger than two inches in the greatest dimension shall not be used for this portion of the backfill. The balance of the backfill shall be made in accordance with the requirements of Table A, Section 900 of Section 1103.02(b).
(9) Connections to existing Y-branches shall be made carefully to avoid damage to the bell of the branch or to the lateral sewer. Such damage as may occur shall be repaired as directed by the Inspector. Connections to a lateral or public sewer at a point where no Y-branch has been provided, shall be made using a tapping saddle.
(10) The permit holder shall repair or restore any drains or service lines damaged or disturbed by him during the construction of the building sewer.
(11) No person, firm or corporation shall discharge or permit the discharge of any deleterious wastes into the sewerage system. Such wastes are defined as oils, acids, cyanides, poisons and any other substance, gas or liquid which may in any way damage or interfere with the use or operation of the sanitary sewers or sewage treatment plant or which may create a hazard to life or property.
(12) No downspouts, surface inlets, foundation drains, subsurface drains or any other source of ground or surface water shall be connected either directly or indirectly to or discharged into any part of the sanitary sewerage system. Such drains, inlets and downspouts shall be so constructed as to drain or be pumped into the street, gutter, ditch or the storm sewers.
(13) Surface water which collects in basement or foundation excavations shall not be discharged at any time into the building sewer. If the building sewer is completed before the plumbing is connected thereto, the building sewer shall be tightly closed at all times with a plumber's plug or other watertight plug in order to prevent surface or ground water from entering the building sewer.
(Ord. C 61-73. Passed 8-6-73.)