Loading...
(a) No unauthorized person shall uncover, make any connections with or opening into, use, alter or disturb any public sewer or appurtenance thereof without first obtaining a written permit from the Superintendent.
(b) There shall be two classes of building sewer permits: (1) for residential and commercial service, and (2) for service to establishments producing industrial wastes. In either case, the owner or his agent shall make application on a special form furnished by the City. The permit application shall be supplemented by any plans, specifications or other information considered pertinent in the judgment of the Superintendent. A permit and inspection fee for either type sewer permit shall be paid to the City at the time the application is filed.
(c) All costs and expense incident to the installation and connection of the building sewer shall be borne by the owner. The owner shall indemnify the City from any loss or damage that may directly or indirectly be occasioned by the installation of the building sewer.
(d) A separate and independent building sewer shall be provided for every building; except where one building stands at the rear of another on an interior lot and no private sewer is available or can be constructed to the rear building through an adjoining alley, court, yard or driveway, the building sewer from the front building may be extended to the rear building and the whole considered as one building sewer.
(e) Old building sewers may be used in connection with new buildings only when they are found on examination and test by the Superintendent, to meet all requirements of this chapter.
(f) The size, slope, alignment, materials of construction of a building sewer, and the methods to be used in excavating, placing of the pipe, jointing, testing and backfilling the trench, shall conform to the requirements of Section 937.10(a). In the absence of provisions or in amplification thereof, the materials and procedures set forth in appropriate specifications of the Ohio Environmental Protection Agency, the ASTM and WPCF manual of practice No. 9 shall apply.
(g) Whenever possible, the building sewer shall be brought to the buildings at an elevation below the basement floor. In all buildings in which any building drain is too low to permit gravity to flow to the public sewer, sanitary sewage carried by such building drain shall be lifted by an approved means and discharged to the building sewer.
(h) No person shall make connection of roof downspouts, exterior or interior foundation drains, sump pumps connected to foundation drains, areaway drains, loading dock drains, or other sources of surface runoff or groundwater to a building sewer or building drain which is in turn connected directly or indirectly to a public sanitary sewer.
(i) The connection of the building sewer into an existing public sewer shall be made with a forty-five degree angle pointing downstream. Two forty-five degree els may be used to make a long ninety degree angle thereby allowing a shorter run of building sewer pipe. The connection to the main sewer pipe shall be made with an approved cast iron connector and made watertight and strong by encasing in concrete for a distance of six inches in all directions from outer edge of tap.
(j) The connections for building sewers shall be provided for when new sewer main is installed by installing forty-five degree wyes for each lot. When new streets are involved, the building sewer shall be installed to each lot line and tested with the main sewer.
(k) All building sewer connections are to be recorded as to distance to downstream manhole. Lot line connections to be recorded by triangulation from both downstream and upstream manholes and marked with a two inch by four inch piece of wood extending from the end of pipe to not less than one inch above final grade of lot.
(l) All new or repaired old building sewer pipe shall have a cleanout installed using either a large side outlet tee or two wyes facing each other so the sewer may be cleaned either way. Also a cleanout connection at the opposite side of the building or in the basement may serve as a cleanout. The cleanout must be strong and water and airtight. If installed in yard, the connections must be set in concrete.
(m) The applicant for the building sewer permit shall notify the Superintendent twenty-four hours before the building sewer is ready for inspection and connection to the public sewer. The connection shall be made during normal working hours of the City Sewer Department and under the supervision of the Superintendent or his representative.
(n) All excavations for building sewer installation shall be adequately guarded with barricades and lights so as to protect the public from hazards. Streets, sidewalks, parkways and other public property disturbed in the course of the work shall be restored in a manner satisfactory to the City.
(o) All building sewers shall be properly maintained by the property owner at no
expense to the City. If the building sewer becomes in need of repair to the point that the sewage system is affected, the Superintendent, upon notice to the property owner may make necessary repairs to such sewer and bill the owner for same.
(p) Where the building sewer is suspended across a lower ditch such as the area around a basement wall, either cast iron or asbestos-cement pipe must be used to bridge the open space.
(Ord. 12-2-74-A. Passed 1-20-75.)
(a) New sewer systems shall be designed on the basis of an average daily per capita flow of sewage of not less than 100 gallons per day. When sewers are designed on a running full basis, the following per capita sewage contributions exclusive of industrial flow should be used:
(1) Building sewers - 400 gallons per capita per day.
(2) Main sewers - 250 gallons per capita per day.
(b) No building sewer shall be less than six inches in diameter.
(c) No sanitary sewer main shall be less than eight inches in diameter.
(d) In general, sewers shall be sufficiently deep so as to receive sewage from basements and to allow for further extensions. At no time shall a sewer be less than two foot in depth unless encased in concrete.
(e) Slopes of sewers may be greater but not less than the following:
Sewer (inches) Minimum slope in feet per 100 feet 6 0.60 8 0.40 10 0.28 12 0.22 14 0.17 15 0.15 16 0.14 18 0.12 21 0.10 24 0.08 27 0.67 30 0.058 36 0.046 |
Sewers shall be laid with uniform slope between manholes. Sewers on twenty percent (20%) slope or greater shall be anchored securely with concrete anchors or equal, spaced
as follows:
(1) Not over thirty-six feet center to center on grades twenty percent (20%) and up to thirty-five percent (35%).
(2) Not over twenty-four feet center to center on grades thirty-five percent (35%) and up to fifty percent (50%).
(3) Not over sixteen feet center to center on grades fifty percent (50%) and over.
(f) Sewers twenty-four inches or less shall be laid with straight alignment between manholes.
(g) When a smaller sewer joins a larger one, the invert of the larger sewer should be lowered sufficiently to maintain the same energy gradient. An approximate method for securing these results is to place the 0.8 depth point of both sewers at the same elevation.
(h) Where velocities greater than fifteen feet per second are attained, special provision shall be made to protect against displacement by erosion and shock.
(i) Sewer pipe must be either strength clay pipe meeting ASTM specifications
C-700, or asbestos-cement class C-428 or greater sewer pipe. Cast iron sewer pipe shall be used where the Superintendent sees the need for added strength or safety. No pipe joints of less than four foot shall be used. No concrete shall be approved.
(j) Joints for all sewer pipe shall be of the “O” ring type compression joints as defined by ASTM designation C-425. Poured joints and joints of the slip seal type shall not be approved.
(k) Sanitary sewers and sewage force mains should be laid with at least a ten foot horizontal separation from any water main. Sewers (or sewage force main) may be laid closer than ten feet to a water main if it is laid in a separate trench and the elevation of the crown of the sewer (or sewage force main) is at least eighteen inches below the bottom of the water main. If it is impossible to maintain the eighteen inch vertical separation when the sewer is laid closer than ten feet to the water main, the sanitary sewer should be constructed of (or encased in) water main type materials which will withstand a fifty p.s.i. water pressure test.
If a sewage force main is laid closer than ten feet to a water main, in no case should the sewage force main be laid such that the crown of the sewage force main is less than eighteen inches below the water main.
(l) Whenever sewers cross under water mains, the sewer shall be laid at such an elevation that the top of the sewer is at least eighteen inches below the bottom of the water main. When the elevation of the sewer cannot be buried to meet the above requirements, the water main shall be relocated to provide this separation or the sewer constructed of cast iron, or asbestos-cement pressure pipe for a distance of ten foot on either side of the water main.
(m) Inverted siphons should have not less than two barrels, with a minimum pipe size of six inches and shall be provided with necessary appurtenances for convenient flushing and maintenance; the manholes shall have adequate clearances for rodding; and in general, sufficient head shall be provided and pipe sizes selected to secure velocities of at least 2.0 feet per second for average flows. The inlet and outlet details shall be arranged so that the normal flow is diverted to one barrel, and so that either barrel may be cut out of service for cleaning.
(n) Trench Specifications for Water and Sewer Lines. Minimum trench width pipe o.d. + 18 inches; pipe to be bedded in clean, compacted sand with minimum of six inches on sides, top and bottom.
Balance of trench to within six inches of ground level, to be bank-run river gravel well compacted or flooded.
Remaining six inches to be of top soil and seeded if in lawn type area; if in street or alley area to be surfaced with same type material as surrounding area.
(Ord. 12-2-74-A. Passed 1-20-75.)
(a) Low Pressure Air Acceptance Test.
(1) The contractor shall furnish all equipment and personnel to conduct an acceptance test using low pressure air. The test shall be conducted after backfilling and under the supervision of the Superintendent.
(2) All branch fittings and ends of lateral stubs shall be securely plugged to withstand the internal test pressures. The section of line being tested shall also be securely plugged at each manhole. All stoppers shall be adequately braced when required.
(3) Air shall be slowly supplied to the plugged pipe line until the internal air pressure reaches 4.0 pounds per square inch greater than the average back pressure of any ground water that may submerge the pipe. At least two minutes shall be allowed for temperature stabilization before proceeding further.
(4) The rate of air loss shall then be determined by measuring the time interval required for the internal pressure to decrease from 3.5 to 2.5 pounds per square inch.
(5) The pipe line shall be considered acceptable if the time interval for the 1.0 PSI pressure drop is not less than the holding time listed in the following air test table.
Minimum holding time in seconds required for pressure to drop from 3.5 to 2.5 PSIG.
Pipe Diameter | ||||||||||||||
Length of line in feet | 4 | 6 | 8 | 10 | 12 | 15 | 18 | 21 | 24 | 27 | 30 | 33 | 36 | 39 |
25 | 4 | 10 | 18 | 28 | 40 | 62 | 89 | 121 | 158 | 200 | 248 | 299 | 356 | 418 |
50 | 9 | 20 | 35 | 55 | 79 | 124 | 178 | 243 | 317 | 401 | 495 | 599 | 713 | 837 |
75 | 13 | 30 | 53 | 83 | 119 | 186 | 267 | 364 | 475 | 601 | 743 | 898 | 1020 | 1105 |
100 | 18 | 40 | 70 | 110 | 158 | 248 | 356 | 485 | 634 | 765 | 851 | 935 | ||
125 | 22 | 50 | 88 | 138 | 198 | 309 | 446 | 595 | 680 | |||||
150 | 26 | 59 | 106 | 165 | 238 | 371 | 510 | |||||||
175 | 31 | 69 | 123 | 193 | 277 | 425 | ||||||||
200 | 35 | 79 | 141 | 220 | 317 | |||||||||
225 | 40 | 89 | 158 | 248 | 340 | |||||||||
250 | 44 | 99 | 176 | 275 | ||||||||||
275 | 48 | 109 | 194 | 283 | ||||||||||
300 | 53 | 119 | 211 | |||||||||||
350 | 62 | 139 | 227 | |||||||||||
400 | 70 | 158 | ||||||||||||
450 | 79 | 170 | ||||||||||||
500 | 88 | |||||||||||||
550 | 97 | |||||||||||||
600 | 106 | |||||||||||||
650 | 113 | 170 | 227 | 283 | 340 | 425 | 510 | 595 | 680 | 765 | 851 | 935 | 1020 | 1105 |
To be used in testing one diameter only.
(b) Exfiltration Acceptance Test.
(1) The contractor shall furnish all equipment including the water and personnel to conduct an acceptance test using water. The test shall be conducted after backfilling and under the supervision of the Superintendent.
(2) In the exfiltration test, the inlet end of the upstream and downstream manholes shall be closed with a watertight plug, and the sewer along with the upstream manhole shall be filled with water until the elevation of the water in the upstream manhole is two feet higher than the top of the pipe in the section being tested, or two feet above the existing ground water in the trench whichever is the higher elevation. The exfiltration will be determined by measuring the amount of water required to maintain the above stated water elevation for a period of one hour from the start of the test. The entire length of section to be tested shall be filled and maintained full of water for a period of approximately twenty- four hours prior to the start of the test.
(3) Leakage in excess of 200 gallons per inch diameter per mile of pipe per day when measured and tested by methods herein described on any section including manholes shall be deemed to unsatisfactory performance.
(4) The allowable leakage is based on a maximum difference in elevation of eight feet between the level of water at the upper manhole and the invert of the pipe being tested in the lower manhole. If the difference in elevation exceeds eight feet, the allowable leakage shall be increased five percent (5%) for each one foot in excess of eight feet.
(c) It is understood that each section, as above described, must be tested and determined by the Superintendent to conform to this section before such section or sections may become part of the City system. It is further understood that, if the leakage does not come within the limits specified, the owner or contractor will be required to do such work as may be necessary in order to insure conformance even to the extent of reconstructing the defective section or sections. The method of testing is at the direction of the Superintendent.
(d) Before any section of an abandoned sewer system may be put into use as part of the City system, it must be tested and accepted by the Superintendent as meeting requirements of this chapter.
(Ord. 12-2-74-A. Passed 1-20-75.)
Loading...