The following are the minimum standards set forth by the Subdivision Regulations for the construction and testing of sanitary sewers.
(a) Plans for proposed sanitary sewer collection systems shall be submitted to the Municipality Engineer and to the City of Columbus for approval. All plans must show pipe sizes, location of mains, manholes, wye connections, cleanouts, and other appurtenances. Such installation and materials shall be in conformity with the Municipality of Groveport and the City of Columbus standards. In addition, review and approval by the City of Columbus is required when said sanitary collection system is to be a part of the City of Columbus system.
(b) Sanitary sewers shall be designed to maintain a minimum velocity of two (2) feet per second. The minimum pipe diameter shall be eight (8) inches. The sewer pipe shall be designed to carry peak flows resulting from average daily flows as indicated on the Ohio Environmental Protection Agency's "Sewage Flow Guides" for specific development improvements. The design for sewer conduit (pipe) shall conform to the requirements by the City of Columbus. A pipe shall be used which is strong enough, in conjunction with the specified bedding, to withstand the trench loading and line loading imposed now or in the known future.
(c) Sanitary sewer Y-branches shall be installed during the construction of the collector sewers. If the sewer is located within the street right-of-way, service extensions shall be made within one (1) foot of the right-of-way. Where the sewer is more than twelve (12) feet deep, risers shall be included as part of the construction work. The risers shall be brought to a point not less than ten (10) feet below the ground. All risers shall be located and marked with "wye-poles" prior to the acceptance of the improvements.
(d) Concrete encasements shall be used when sanitary sewers are required to withstand the trench loading, 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 (2-1/2) feet.
(e) Leakage tests are required for all sanitary sewers except building sewers, or unless otherwise requested by the Sewer Inspector. A deflection test is required for all sewers using PVC pipe and non-rigid conduit pipe material.
(1) The sewer shall be tested in sections, each section extending between two (2) consecutive manholes or from the end of the sewer to the nearest manhole. The contractor may elect to use either an infiltration or exfiltration test;
(2) If the infiltration test is selected, each section of pipe shall be covered with no less than two feet of ground water above the top of the pipe at the highest point 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. The sewer and the upstream manhole shall be filled with water until the elevation of the water in the upstream manhole is two (2) 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 (1) hour from the start of the test;
(4) The amount of infiltration or exfiltration as applicable shall not exceed a rate of one-hundred (100) gallons per inch of pipe diameter per twenty-four (24) hours per mile of sewer in each and every section tested in accordance with this subsection (e);
(5) All lines shall be measured for vertical ring deflection no sooner than thirty (30) days after the completion of back filling operations provided if, in the judgment of the Municipality Engineer, sufficient settlement has occurred. The deflection test shall be performed by pulling a rigid ball or mandrill, with a diameter equal to ninety-five percent (95%) of the inside diameter of the pipe, through the sewer. The maximum limit of vertical deflection shall not exceed five percent (5%) of the base inside diameter of the pipe as shown in Appendix XI (ASTM D-3034).
(f) Building sewers shall be constructed at no expense to the Municipality.
(1) Before any building sewer is constructed, a tap permit must be obtained from the Municipal Administrator or designee. The person applying for the 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.
(2) All construction or repair of building sewers shall be inspected and approved 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 Municipal Administrator or designee requesting the inspection at least one-half (1/2) day before the inspection is desired;
(3) The building sewer shall be constructed of a size not less than six (6) inches internal diameter, laid with a minimum fall of one-fourth (1/4) inch per linear foot and shall be vitrified clay pipe, ABS composite, PVC or ductile iron pipe. All joints must be watertight and use proper curves for all changes in alignment or grade. Only adapters approved by the Municipality 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 perfectly clean and free from offsets, fins, and projections before the next length of pipe is connected thereto:
A. The Municipal Administrator or designee may, by special permission in each case, authorize the building sewer to be constructed with a fall as little as one-eighth (1/8) inch per lineal foot if he determines such procedure to be desirable.
B. The Sewer inspector may require that the water tightness of the joints be demonstrated by the testing procedures established in subsection (e) hereof.
(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 Municipal Administrator or designee may make an exception as to the size of old building sewers provided they are not less than four (4) inches in internal diameter and otherwise meet the requirements of this section;
(5) Building sewers shall not be constructed closer than three (3) 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:
A. 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 a uniform bearing from end to end.
B. 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 stone as specified by the Sewer Inspector.
C. The width of the trench at the top of the pipe shall not exceed two (2) feet plus the outside diameter of the pipe nor shall the width be less than one (1) foot plus the outside diameter of the pipe.
D. When unstable, soft or spongy conditions are encountered at the trench bottom; such materials 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 Sewer Inspector.
E. 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 when the construction will require the opening, cutting, barricading, or otherwise impeding the flow of traffic of any public street, road, or alley:
A. If the flow of traffic is impeded, a written request to the Municipal Administrator shall be submitted and written authorization required stating that permission has been granted to the applicant from the governmental body having authority to grant said permission.
B. Any tap permit so issued shall be subject to any restrictions or conditions as required by the governmental body.
(8) Tampering in the finely graded soil or granular material in six (6) inch layers shall backfill the building sewer to an elevation at least twelve (12) inches over the top of the pipe. Soils containing stones lager than two (2) inches shall not be used for this portion of the back fill;
(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 Sewer Inspector. Connections shall not be made to the public sewer at the manholes unless prior permission has is granted by the Municipal Administrator or designee. Connections to the lateral or public sewer at a point where no Y-branch has been provided shall be made by using a tapping saddle;
(10) The permit holder shall repair or restore any drains or service lines damaged or disturbed by them 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 sewage system. Such wastes are defined as oils, acids, cyanides, poisons and any other substances, gas or liquid which may in any way damage or interfere the use or operation of the sanitary sewers or sewage treatment plant and 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 discharge in to any part of the public or private sanitary sewer system. Said drains, inlets, and downspouts shall be constructed to drain or be pumped into the street, gutter, ditch or the storm sewer;
(13) Surface water that collects in the 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 plugs in order to prevent surface or ground water from entering the building sewer.
(g) When sanitary sewer service is not available, any on-site treatment facility shall be approved by the County Board of Health and/or the Ohio Environmental Protection Agency. (Ord. 19-011. Passed 4-22-19.)