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3.1 - Engineering

3.101 Preparation of Drawings, Specifications, and Designer's Reports 
A. General Information
B. Designer's Reports 

3.102 Plans of Sewerage Facilities
A. General Information
B. Detailed Plans 

3.103 Plans of Sewers
A. General Information
B. Boring Location Plans
C. Detailed Plans and Profiles
D. Special Detail Drawings 

3.104 Plans of Sewage Pumping Stations
A. Location Plan
B. Detailed Plans 

3.105 Plans of Sewage Treatment Plants
A. Location Plan
B. General Layout
C. Detailed Plan 

3.106 Specifications
A. General Information
B. Construction Requirements 

3.107 Revisions to Approved Plans 

3.108 Operation During Construction 


A. General Information
All drawings, specifications, and designer's reports submitted for approval shall be prepared by or under the supervision of a Registered Professional Engineer legally licensed to practice in Ohio. The front cover or fly leaf of each set of such drawings, of each copy of the designer's reports and of the specifications submitted, shall bear the imprint of the seal of the Registered Engineer by or under whom it was prepared. In addition, each drawing submitted shall bear an imprint or a legible facsimile of such seal.

B. Designer's Reports
The purpose of the report is to record in form for convenient and permanent reference the controlling assumptions made and factors used in the functional design of the sewerage works as a whole and of each of the component units. Data on structural, mechanical, and electrical designs may be excluded except to the extent that reference to such elements are necessary in checking the functional operation. Copies of a report consisting of the appropriate required information shall be submitted to the approving agency. 


A. General Information
All plans for sewerage facilities shall bear a suitable title sheet showing the name of the municipality, sewer district, or institution, and show the scale in feet, a graphical scale, original lot number and tract, the north point, date and the name of the engineer and imprint of the registration seal; these plans shall be clear and legible.

All plans shall be drawn to a scale which will permit all necessary information to be plainly shown. To facilitate the microfilming of all approved plans, the maximum plan size shall be no larger than 24 inches by 36 inches. Datum used shall be USGS only.

B. Detailed Plans
Detailed plans shall consist of plan views, elevations, sections and supplementary views which, together with the specifications and general layouts, provide the working information for the contract and construction of the works. Dimensions and relative elevations of structures, the location and outline of form of equipment, location and size of piping, water levels, ground elevations, and any other pertinent data shall be included. All plans shall include complete general notes and applicable standard sewer details pertaining to the project. 


A. General Information
A comprehensive plan of the existing and/or proposed sewers shall be submitted for projects involving new sewer systems or substantial additions to existing systems. This plan shall show the following:
  1. Topography and Elevations
    Existing or proposed streets and all streams, water courses, or water surfaces shall be clearly shown.
  2. Contour Lines
    General contour lines of not more than two (2) feet intervals shall be included.
  3. Streams
    The direction of flow in all streams, and high and low water elevations of all water surfaces at sewer outlets and overflows shall be shown. Where necessary, cross sections may be required.
  4. Boundaries
    The boundary lines of the municipality or township and the sewer district or area to be sewered by project shall be shown.
  5. Sewers
    The plan shall show the location, size, slope and direction of flow of all existing and proposed sanitary, storm, and combined sewers associated with the proposed project.
  6. Location of any Wetlands or Flood Plains.

B. Boring Location Plans
Boring location plan and cross section (with boring log sheets) shall be supplied when required by the reviewing agency for major sewer projects.

C. Detailed Plans and Profiles
Detailed plans and profiles must be submitted for sewer construction projects. Projects should have a horizontal scale of not more than fifty (50) feet to the inch. Profiles shall have an appropriate vertical scale of not more than ten (10) feet to the inch. Plans and profile shall show:

  1. Location of streets.
  2. Existing and proposed ground surface, elevations, size, material and type of pipe, length between manholes, invert and surface elevation at each manhole, and grade of sewer between each two (2) adjacent manholes as well as the size and elevations of the sewer into which the flow of the sewer under consideration is to discharge. All manholes shall be numbered and stationed on the plan and correspondingly numbered on the profile.
  3. Where there is any question of the sewer being sufficiently deep to serve any existing or proposed building, the elevation and location of the basement floor shall be plotted on the profile and plan of the sewer which is to serve the building in question. The engineer shall state that all sewers are sufficiently deep to serve existing adjacent basements and future normal depth basements except where otherwise noted on the plans.
  4. Locations of all special features such as inverted siphons, concrete encasements, elevated sewers, etc.
  5. All known existing structures and vegetation both above and below ground which might interfere with the proposed construction, particularly water mains, gas mains, underground utilities, etc.

D. Special Detailed Drawings
Special detailed drawings, made to a scale to clearly show the nature of the design, shall be furnished to show the following particulars:

  1. All stream crossings and sewer outlets, with elevations of the stream bed and extreme high and low water levels.
  2. Details of all special sewer joints and cross-sections.
  3. Details of all sewer appurtenances such as, but not limited to, manholes, catch basins, inlets, inspection chambers, inverted siphons, regulators, head-walls and elevated sewers.


A. Location Plan
A plan shall be submitted for projects involving construction or modification of pumping stations. This plan shall show the following:
  1. The location and extent of the tributary area.
  2. Any municipal or township boundaries within the tributary area.
  3. The location of the pumping station and force main and gravity sewers.
  4. Location and capacity of existing outlet sewer or treatment facility.
  5. The general topography using a maximum contour interval of ten (10) feet and pertinent elevations.
  6. Location of any wetlands or flood plain.

B. Detailed Plans
Detailed plans shall be submitted showing the following, where applicable:

  1. A topographic map of the property to be used. Contour intervals shall be not more than two (2) feet.
  2. Existing pumping station.
  3. Proposed pumping station, including provision for installation of future pumps or ejectors, standby power, telemetry equipment and removal of pumps.
  4. Elevation of high water at the site, and maximum elevation of sewage in the collection system upon occasion of power failure.
  5. Test borings and ground water elevations.


A. Location Plan
A plan shall be submitted showing the sewage treatment plant in relation to the remainder of the system. A USGS Topographic Map (7.5 minute series where available) shall be included to indicate its location with relation to streams and the point of discharge of treated effluent.

B. General Layout
Layouts of the proposed sewage treatment plant shall be submitted showing:
  1. Topography of the site.
  2. Size and location of plant structures.
  3. Schematic flow diagram showing the flow through various plant units.
  4. Piping, including any arrangements for bypassing individuals units.
  5. Materials handled and direction of flow through pipes shall be shown.
  6. Hydraulic profiles showing the flow of sewage, supernatant and sludge, including hydraulic and energy gradients.
  7. Test borings and ground water elevations.
  8. Location of existing streams, ditches, etc.

C. Detailed Plans
Detailed plans shall show the following:

  1. Location, dimensions and elevations of all existing and proposed plant facilities.
  2. Elevations of high and low water level of the body of water to which the plant effluent is to be discharged.
  3. Type, size, pertinent features, and manufacturer's rated capacity of all pumps, blowers, motors and other mechanical devices.
  4. Type, size, slope, material of all piping and open conduits.
  5. Adequate description of any features not otherwise covered by specifications.


A. General Information
Complete technical specifications for the material and construction of sewers, sewage pumping stations, sewage treatment plants, and all appurtenances, shall accompany the detailed plans.

The specifications shall include, but not be limited to, all construction information not shown on the drawings which is necessary to inform the builder in detail of the construction requirements as follows:

B. Construction Requirements
  1. Quality of materials, workmanship, fabrication, and the type, size, strength, operating characteristics, requirements and rating of all mechanical and electrical equipment.
  2. Allowable infiltration.
  3. Valves, piping and jointing of pipe.
  4. Wiring.
  5. Meters.
  6. Laboratory fixtures and equipment.
  7. Operating tools.
  8. Construction materials.
  9. Special filter materials such as stone, sand or gravel.
  10. Miscellaneous appurtenances.
  11. Chemicals when used.
  12. Instructions for testing materials and equipment as necessary to meet design standards.
  13. Operating tests for the complete works and component units.
  14. Requirement for instructions, warranties and Operation and Maintenance manuals.
  15. Traffic control.
  16. Permit requirements.

The facilities shall be constructed under supervision of a professional engineer in accordance with the approved plans, reports, and specifications. Any deviations from approved plans or specifications affecting capacity, flow or operation of units shall be approved in writing before such changes are made. Plans or specifications so revised should therefore be submitted well in advance of any construction work which will be affected by such changes to permit sufficient time for review and approval. "As Built" plans, prepared by the design engineer, clearly showing any alterations shall be placed on file with the responsible agency at the completion of the work. 

Specifications shall contain a program or require a plan for keeping existing sewers, pumping stations and/or treatment plant units in operation during construction of the improvements.