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All excavations for building sewer installations shall be made in accord with the following and with the provisions of Chapter 135 where applicable.
1. Barricades and Lighting. Adequate barricades and warning lights shall be so placed as to protect the public from hazard.
2. Public Convenience. Streets and alleys shall be opened in the manner which will cause the least inconvenience to the public and admit the uninterrupted passage of water along the gutter on the street.
3. Construction Methods. All excavation required for the installation of a building sewer shall be open trench work unless otherwise approved by the City. Pipe laying and backfill shall be performed in accordance with the City’s construction specifications, except that no backfill shall be placed until the work has been inspected.
4. Restoration of Public Property. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the City, at the expense of the property owner.
5. Completion by the City. Should any excavation be left open or only partially refilled for 24 hours or should the work be improperly done, the Building Official shall have the right to finish or correct the work, and the Council shall assess the cost to the property owner or plumber. If the plumber is assessed, the plumber must pay the cost before receiving another permit. If the property owner is assessed, such assessment may be collected with and in the same manner as general property taxes.
Any connection with a public sanitary sewer must be made under the direct supervision of the Building Official and in accordance with the following:
1. Old Building Sewers. Old building sewers may be used in connection with new buildings only when they are found, on examination and test conducted by the owner and observed by the Building Official, to meet all requirements of this chapter.
2. Separate Building Sewers. A separate and independent building sewer shall be provided for every occupied building; except where one building stands at the rear of another on an interior lot and no sewer is available or can be constructed to the rear building through an adjoining alley, court, yard, or driveway. In such cases the building sewer from the front building may be extended to the rear building and the whole considered as one building sewer.
3. Installation. The installation and connection of the building sewer into the public sewer shall conform to the requirements of the State Plumbing Code, and other applicable rules and regulations of the City. All such connections shall be made gastight and watertight. Any deviation from the prescribed procedures and materials must be approved by the Building Official before installation.
4. Water Lines. When possible, building sewers should be laid at least ten (10) feet horizontally from a water service. The horizontal separation may be less, provided the water service line is located at one side and at least twelve (12) inches above the top of the building sewer.
5. Size. Building sewers shall be sized for the peak expected sewage flow from the building with a minimum building sewer size of four (4) inches.
6. Alignment and Grade. All building sewers shall be laid to a straight line to meet the following:
A. Recommended grade at one-fourth (1/4) inch per foot.
B. Minimum grade of one-eighth (1/8) inch per foot.
C. Minimum velocity of 2.50 feet per second with the sewer half full.
D. Any deviation in alignment or grade shall be made only with the written approval of the Building Official and shall be made only with approved fittings.
7. Depth. Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor. The depth of cover above the sewer shall be sufficient to afford protection from frost.
8. Sewage Lifts. In all buildings in which any building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by approved artificial means and discharged to the building sewer.
9. Pipe Specifications. Building sewer pipe shall be free from flaws, splits, or breaks. Materials shall be as specified in the Building Code except that the building sewer pipe, from the property line to the public sewer, shall comply with the current edition of one of the following:
A. Clay sewer pipe – A.S.T.M. C-700 (extra strength).
B. Extra heavy cast iron soil pipe – A.S.T.M. A-74.
C. Ductile iron water pipe – A.W.W.A. C-151.
D. P.V.C. – SDR26 – A.S.T.M. D-3034.
E. Concrete sewer pipe – A.S.T.M. C-14.
10. Bearing Walls. No building sewer shall be laid parallel to or within three (3) feet of any bearing wall that might thereby be weakened.
11. Jointing. Fittings, type of joint and jointing material shall be compatible with the type of pipe used, subject to the approval of the Building Official. Solvent-welded joints are not permitted.
12. Unstable Soil. No sewer connection shall be laid so that it is exposed when crossing any watercourse. Where an old watercourse must of necessity be crossed or where there is any danger of undermining or settlement, cast iron soil pipe or vitrified clay sewer pipe thoroughly encased in concrete shall be required for such crossings. Such encasement shall extend at least six (6) inches on all sides of the pipe. The cast iron pipe or encased clay pipe shall rest on firm, solid material at either end.
13. Preparation of Basement or Crawl Space. No connection for any residence, business or other structure with any sanitary sewer shall be made unless the basement floor is poured, or in the case of a building with a slab or crawl space, unless the ground floor is installed with the area adjacent to the foundation of such building cleared of debris and backfilled. The backfill shall be well compacted and graded so that the drainage is away from the foundation. Prior to the time the basement floor is poured, or the first floor is installed in buildings without basements, the sewer shall be plugged and the plug shall be sealed by the Building Official. Any accumulation of water in any excavation or basement during construction and prior to connection to the sanitary sewer shall be removed by means other than draining into the sanitary sewer.
Grease, oil, sludge and sand interceptors shall be provided by gas and service stations, convenience stores, car washes, garages, and other facilities when, in the opinion of the Building Official, they are necessary for the proper handling of such wastes that contain grease in excessive amounts or any flammable waste, sand or other harmful ingredients. Such interceptors shall not be required for private living quarters or dwelling units. When required, such interceptors shall be installed in accordance with the following:
1. Design and Location. All interceptors shall be of a type and capacity as specified by the Building Code, approved by the Building Official, and shall be located so as to be readily and easily accessible for cleaning and inspection.
2. Construction Standards. The interceptors shall be constructed of impervious material capable of withstanding abrupt and extreme changes in temperature. They shall be of substantial construction, watertight and equipped with easily removable covers that shall be gastight and watertight.
3. Maintenance. All such interceptors shall be maintained by the owner at the owner’s expense and shall be kept in continuously efficient operations at all times.
Connection of the building sewer into the public sewer shall be made at the “Y” branch, if such branch is available at a suitable location. If no properly located “Y” branch is available, a saddle “Y” shall be installed at the location specified by the Building Official. The public sewer shall be tapped with a tapping machine and a saddle appropriate to the type of public sewer shall be glued or attached with a gasket and stainless steel clamps to the sewer. At no time shall a building sewer be constructed so as to enter a manhole unless special written permission is received from the Building Official and in accordance with the Building Official’s direction if such connection is approved.
All connections with the sanitary sewer system before being covered shall be inspected and approved, in writing, by the Building Official. As soon as all pipe work from the public sewer to inside the building has been completed, and before any backfilling is done, the Building Official shall be notified and the Building Official shall inspect and test the work as to workmanship and material; no sewer pipe laid under ground shall be covered or trenches filled until after the sewer has been so inspected and approved. If the Building Official refuses to approve the work, the plumber or owner must proceed immediately to correct the work.
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