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(a) Standards for the design of private sewers or private drains. All private sewers or private drains shall be designed in accordance with the standards and requirements of this rule and the department's most recent drainage design criteria. All design flow computations shall be made in accordance with the most recent zoning designations established by the city.
(b) Sewer size. The minimum Private sewer or Private drain sizes shall be 10" diameter for sanitary sewers or drains, 12" diameter for storm sewers or drains, and 15" diameter for combined sewers or drains. The following diameters shall be used for sewers up to 18": 10", 12", 15", 18". After 18", private sewer or private drain diameters shall increase in 6" increments to a maximum of 72".
(c) Manning's Coefficient. The Manning Coefficient 'n' for extra strength vitrified clay pipes, or precast reinforced concrete pipes, precast concrete box sewers, and ductile iron pipes, shall be n = 0.013. For poured-in-place box sections, the Manning's Coefficient shall be n = 0.015.
(d) Depth of proposed private sewers or private drains. The minimum depth of cover to the outer top of private sewers or private drains shall be 4.0 feet for storm sewers or drains, 10.0 feet for sanitary and combined sewers or drains, and 5.0 feet for force mains. In situations where the depth of cover to the outer top must be reduced, an absolute minimum of 3.5 feet for storm sewers or drains and 8.5 feet for sanitary and combined sewers or drains shall be maintained at all times. The maximum depth to the invert of the pipe shall not be greater than 18.0 feet.
(e) Clearance. The minimum net vertical clearance between the invert of storm sewers or drains and the inner top of sanitary sewers or drains shall be 2 feet. At street intersections where there are no site connections, the minimum net clearance between the outside of storm sewers or drains and the outside of sanitary sewers or drains shall be 6 inches.
(f) Slopes and velocities. Wherever possible, the slope of the private sewer or private drain should be approximately parallel to the ground surface. The slope of private sewers or private drains shall be computed, based upon mapped street lengths, to the nearest 0.01% generally and to the nearest 0.001% on very flat slopes. The minimum velocity for pipes flowing full shall be 3.0 feet per second (fps) for storm sewers or drains and combined sewers or drains. The minimum velocity for sanitary sewers or drains flowing full shall be 3.0 fps until a design flow of 0.7 cubic feet per second (cfs) is attained. After this quantity of flow has been reached, sanitary sewers or drains shall be designed according to the standard criteria for pipes flowing full with a minimum velocity of 2.5 fps. Maximum velocity for pipes flowing full shall be 15 fps. In no case shall the slope exceed 10%. In the case of very steep slopes, drop manholes shall be provided so that the maximum velocity is within the allowable limits. The depth of drop in drop manholes shall be measured from the invert of the higher sewer or drain to the spring line of the lower sewer or drain. Specially constructed drop pipe manholes shall be used in situations where the drop is 4.0 feet or greater. Velocities shall be computed to the nearest 0.01 fps for velocities under 10 fps and to the nearest 0.1 fps for velocities greater than 10 fps.
(g) Design capacity and depth of flow. The Manning's formula shall be used to compute the capacity of proposed Private sewers or Private drains. The maximum design depth of flow in the sewer or drain shall be full for all circular and elliptical sewers or drains and 95% full for flat-top monolithic sections with a minimum freeboard of 3".
(h) Sewer elevation at junctions. Wherever possible, inside top elevations of private sewers or private drains should be matched at all junctions and manholes. For free discharge storm sewer or drain outlets, the inner top of the outlet sewer or drain shall be above the mean high water elevation. For free discharge sanitary sewers or drains, the inner top of the sanitary sewer or drain shall be no lower than the inner top of the intercepting sewer into which it outlets. Information pertaining to the mean high water elevation can be obtained from the records of the nearest tidal station. All parkways, highways, expressways, and the similar roadways within the area encompassed by the drainage plan shall be considered in the design. The drainage system within such areas and the sewer system into which it outlets shall be designed in accordance with the department's latest design criteria. Manhole losses shall not be considered in the design of private sewers or private drains. These losses are accounted for in the matching of inner tops and by designing the pipe flowing full. All private sewers or private drains shall be designed for open channel gravity flow.
All drainage proposal plans submitted to the department for review shall be filed in quadruplicate and shall contain the following information:
(a) a description of the limits of the proposal including street names and borough locations;
(b) a description of the type of proposed private sewer or private drain;
(c) the name and address of the owner and, if different than the owner, the developer of the proposed development. If the owner or developer is not a natural person, then the drainage proposal shall indicate the name of the responsible officer of the corporation or other legal entity;
(d) the name and address of the filing professional engineer or registered architect;
(e) a description of the type of proposed development. If a homeowners' or condominium association is planned for the proposed development, then a draft copy of the owner's offering plan or an affidavit in lieu the draft prospectus shall be submitted;
(f) a description of the limits of proposed development. All properties must be labeled either:
(1) owner's property under this application;
(2) owner's property not under this application; or
(3) property owned by others;
(g) existing block and lot numbers of all properties shown on the drainage proposal. In cases where block and lot modifications are proposed, the tentative block and tentative lot numbers shall be shown;
(h) identification of street status indicating the limits, record width, final map width, and statement of ownership or unknown ownership;
(i) legal grade elevations as shown on a copy of the latest adopted final map or pending alteration map for streets shown on the drainage proposal;
(j) a plan view that shows the street areas, widening lines, record lines, paved and unpaved areas, curb lines, street dimensions, existing or proposed street surface elevations, legal grade elevations, existing and proposed buildings and structures with tie-down distances to property lines (if available), existing and proposed catch basins and their connections, existing and proposed private sewers or private drains;
(k) a plan and profile showing all the existing and proposed sewers or drains fixed by dimensions to street and sewer easement lines; the invert and rim elevations of manholes; the sizes, types, manhole stationing and gradients of all sewers or drains which receive flow from the contributory drainage areas; the reference datum and vertical and horizontal scales. The rim to invert distances at the manholes must be shown on the profile view. All utilities, ditches, and watercourses are to be shown, labeled and dimensioned on both the plan and profile views;
(l) in cases where more than one private sewer or private drain is proposed for a street, a separate profile shall be provided with one private sewer or private drain indicated by solid lines and the others by dashed lines on each sheet;
(m) a schematic showing the outline of basement floors with elevations for both proposed and existing dwelling units, if available;
(n) the sewer datum note for the borough where the proposed private sewers or private drains are to be installed;
(o) the gradient of roadway ramps shall be shown in profile when cut or fill is involved at the end of a proposed private sewer or Private drain;
(p) cross-sectional views of any existing open watercourse with dimensions and side slopes at critical locations along with longitudinal profile with gradients, elevations, stationing, and liner material shall be shown. All computations pertaining to the flow quantity from the contributory drainage areas and the hydraulic characteristics of the watercourse shall be submitted;
(q) for proposed watercourse diversions not using a closed pipe system, a cross-sectional view of the relocated watercourse with dimensions and slopes, along with a longitudinal profile with gradients, elevations, stationing and liner material shall be shown. All hydraulic design computations shall be submitted;
(r) computations to substantiate the side slope stability of proposed open earth channels or cuts shall be submitted. In the event headwalls and/or retaining structures are required, the same shall be shown on the plan;
(s) identification of all existing water mains, gas mains, and other utility substructures as to size and location;
(t) all hydraulic computations necessary to review the proposed private sewers or private drains that receive flow from the contributory drainage areas.
(u) all existing sanitary, stormwater, and combined sewer outlets and computations demonstrating their adequacy to accept the proposed flow in addition to the existing flows;
(v) the tentative locations of all proposed site connections;
(w) indication as to whether the sanitary flow from the proposed development is tributary to city or to a private sewage treatment plant or private pumping station;
(x) a key or location plan showing the proposed development, all surrounding streets, existing and proposed sanitary, stormwater, or combined drainage facilities and stormwater surface Flow patterns, both existing and proposed;
(y) scale and north arrow; and
(z) a certification by the professional engineer or registered architect filing the drainage proposal attesting to the truth and accuracy of the information contained in the drainage proposal, further attesting that he or she prepared or supervised the preparation of the drainage proposal, and further attesting that no employee of the city assisted in its preparation. The certification shall be signed and sealed by the filing professional engineer or registered architect.
All private sewer or private drain plans submitted to the department shall be prepared in accordance with the following requirements and include the following information:
(1) a plan view drawn to a minimum horizontal scale of one inch equals thirty feet (1" = 30'), or one inch equals forty feet (1" = 40') for unimproved streets, and a profile view drawn to a vertical scale of one inch equals three feet (1" = 3');
(2) a key or location plan showing the proposed development, all surrounding streets, existing and proposed sewers or drains, and surface stormwater flow patterns;
(3) the names, record widths, final map widths, dimensions and existing, proposed, and legal grade elevations of all streets surrounding the proposed development in plan and profile views;
(4) the owner's properties to be developed and all other properties abutting the streets wherein the proposed private sewers or private drains are to be built;
(5) Block, lot, and building numbers of all properties shown on the plan. The tentative block and/or tentative lot numbers shall be shown in cases where block and lot modifications are proposed;
(6) the locations, sizes, and types of all existing and proposed private sewers or private drains in plan and profile views;
(7) the locations, sizes, and types of all underground utility lines in relation to the proposed private sewers or private drains in plan and profile views;
(8) hydrants, street lights, overhead utility lines and any other structures or appurtenances;
(9) the offset distances of all existing utilities and proposed private sewers or private drains from street lines;
(10) the locations and sizes of all existing trees;
(11) the types, widths and limits of the existing and proposed pavements, sidewalks, curbs, and driveways;
(12) the locations, sizes, and cross sections of existing stream beds, culverts, and the like in plan and profile views;
(13) the boundaries and buffer zones for all wetlands, designated open spaces, and wildlife sanctuaries;
(14) the locations of all existing and proposed manholes in plan and profile views;
(15) manhole stationing along the proposed private sewer or private drain in profile view (0+00 to be at downstream end);
(16) the gradients of roadway ramps, details of proposed appurtenances, other than standard, including headwalls and the like;
(17) north arrow and scale;
(18) an approved builder's pavement plan shall be separately submitted with the private sewer or private drain plan
(19) the standard notes of Appendix A-4 and the specific notes of Appendix A-5;
(20) a description of the construction limits and the borough;
(21) a signature box for signed approvals by the department;
(22) a description of the legal status of all streets involved;
(23) a traffic note, utility note, highway note, contractor's note, soil note, approval of materials and manufacturers note, sheeting note, stormwater drainage notes; statement as to performance bond, maintenance bond, borings, project review letters from utility companies with the dates of review, and a dewatering permit as required;
(24) a certification executed by the filing professional engineer or registered architect that the survey, field and office work required in the preparation of the plan and as shown on the plan was done by the filing professional engineer or registered architect or an employee acting under his or her direct supervision;
(25) an affidavit executed by the owner of the proposed development that he has submitted all the required legal documents and affidavits pertaining to the final approval of the private sewer or private drain plan;
(26) the date, signature, and seal of the filing professional engineer or registered architect who prepared or supervised the preparation of the private sewer or private drain plan shall appear on each sheet of the plan;
(27) the name and address of the owner;
(28) the final map number, city drainage plan number, and status of all streets; (29) a statement showing the date of completion of the survey for the project and the name of the licensed surveyor. Surveys shall be dated and must have been prepared or updated within one year from the date of submission of the private sewer or private drain plan;
(30) the number of the approved drainage proposal with its approval and expiration dates;
(31) the number and date of approval of the builder's pavement plan;
(32) the name of the wastewater pollution control plant to which the private sewer or private drain is contributory if sanitary or combined sewers or drains are proposed;
(33) the name of the pumping station if a proposed private sewer or private drain is contributory to a pumping station;
(34) all required permits from federal, state, and other city agencies;
(35) borough sewer datum;
(36) a note that the plan is valid for one year from the date of the last required departmental signature;
(37) special notes specific to the particular project; and
(38) all the documentation used in preparing the private sewer or private drain plan shall be listed and described on the plan.
All private sewer or private drain plans submitted to the department shall be prepared in accordance with the following requirements and include the following standard notes:
(a) all sewer work shown on this plan shall be in conformance with the latest standards and specifications of the New York City department of Environmental Protection ("department");
(b) no deviation from an approved plan is allowed during construction without prior written approval of the department;
(c) the department reserves the right to require any change and or additional work necessitated by a change as may be directed by the New York City department of Transportation;
(d) no final inspection, measurements or acceptance will be made until finished grade above sewer conforms with that shown on the approved plans;
(e) all sewer cut sheets must be filed with the department.
(f) subsurface information shown hereon is as furnished by various utility companies and other city departments. The exact location of existing sewers are unknown, but is plotted from the best available information. However, accuracy of this information is not guaranteed by the filing professional engineer or registered architect. The contractor shall determine the exact location in the field prior to construction;
(g) site connection spurs on ESVP shall be installed for every Tax lot with a maximum of 40 feet on both sides of pipe for undeveloped properties as noted on the plan or as directed by the professional engineer or registered architect. For built-up properties, spurs shall be provided for every house. Spurs for connections on ductile iron pipes may be made by approved fittings or by drilling;
(h) all casting and hardware removed from the existing manholes and catch basins whenever found to be in good condition, upon examination by the professional engineer or registered architect, shall remain the property of the city and shall be delivered by the contractor to a designated city owned yard;
(i) contractor shall provide temporary means (pipes, pumps, etc.) to drain any storm water which may develop within the project limits for the duration of construction;
(j) all existing sewers and sewer house connections shall be continuously maintained during construction of private sewers or private drains or associated water main work. If any sewer or site connection is to be disconnected for construction purposes, flow shall be maintained by fluming or other suitable means as approved by the professional engineer or registered architect and in such a manner that no back-ups occur. Existing sewers, house connections or other sewer appurtenances which are to remain, and which might be disturbed for construction purposes, shall be restored to their present condition after completion of the work; and
(k) construction permits and certificate of inspection for proposed catch basins and/or seepage basins system as shown on the approved builders pavement plan shall be issued by the department.
All private sewer or private drain plans submitted to the department shall be prepared in accordance with the following requirements and include the following specific notes:
(a) Contractor's note. The contractor, at the time of taking out the permit for the construction of this private sewer or private drain shall furnish to the borough records office of the department ________________________, NY ________________ (Borough) (ZIP code)
a copy of an agreement between the owner and the contractor and a list of contract prices for the items in the bill of materials on the approved private sewer or private drain plan;
a copy of an agreement between the owner and the contractor and a list of contract prices for the items in the bill of materials on the approved private sewer or private drain plan;
(b) Performance bond. The owner shall file with the department's borough records office ____________________________________________, __________________________, records office (Address) (Borough) __________________ a performance bond in the amount of $________________ to (ZIP Code) secure the faithful performance of this contract. Before submitting any field changes for this project, a letter from the bonding company indicating that they have no objections to this field change shall be presented to the department. The private sewer or private drain contractor may, upon written request to the Department, submit the performance bond, in lieu of the owner. [Note: The amount of performance bond will be the amount of the engineer's cost estimate.];
(c) Maintenance bond. Before a permit is issued for the work as shown on the plan, a maintenance bond covering a two (2) year period from the date of completion and final acceptance of the work performed in the amount of $______________ shall be filed by the owner. The private sewer or private drain contractor may, upon written request to the department, submit the maintenance bond in lieu of the owner. [Note: The amount of maintenance bond shall be 10% of performance bond amount.]
(d) Insurance note. The owner or contractor, prior to the start of construction, shall obtain an insurance policy insuring the City of New York against liability for injury to property or persons, including death. Such policy shall remain in effect until the completion of the project with a minimum period of three (3) years;
(e) Traffic note. The contractor shall notify the office of Engineering Control, Mayor's Traffic Construction Coordinating Committee (MTCCC), 51 Chambers Street, New York, NY 10017, (10 days prior to the issuance of a Construction permit);
(f) Pavement restoration note. To follow specific pavement restoration provisions as stipulated by the New York City Department of Transportation (NYCDOT). Refer to NYCDOT letter dated ________________. Note: The contractor shall restore the pavement in accordance with the NYCDOT stipulations.
(g) Utility note.
(1) All utility companies must be notified at least 72 hours prior to commencement of construction to comply with Rule 53 of Industrial Code of the State of New York, Department of Labor for "Construction, Excavation and Demolition Operations at or near Underground Facilities" (Cited as 12 NYCRR 53); and
(2) for private developments, the support, relocation, reconstruction or rehabilitation of existing utilities due to the construction of this contract is to be done at the expense of the owner of the proposed private sewer or private drain;
(h) Approval of materials and manufacturers' note. The name of city approved subcontractors, vendors, manufacturers, suppliers, and dealers who are to furnish materials, fixtures, equipment, appliances or other fittings shall be submitted by the contractor as early as possible to the Department at 59-17 junction Boulevard, Corona, New York, 11368 for approval.
(i) Soil note. When ordered by the professional engineer or registered architect, the trench shall be excavated to its full depth for at least 50 feet in advance of the private sewer or private drain construction. When in the opinion of the professional engineer or registered architect, the subsoil is deemed to be inadequate, the contractor shall drive piles as ordered. Unsuitable soils encountered at the subgrade less than five (5) feet thick, if encountered at the subgrade shall be removed to an acceptable stratum and replaced with broken stone as directed by the professional engineer or registered architect. In such case, the sheeting placed shall be left in place below the spring line of the pipe only.
(j) Sheeting note.
(1) In performing the sheeting of the private sewer or private drain trench for excavation, the contractor shall comply with the provisions of the New York State Labor Law and particularly with Rule Number 23 (as amended) of the Industrial Code as promulgated by the Board of Standards and Appeals, Department of Labor, State of New York and in accordance with Rules and Regulations listed in Federal Register/volume 54, number 209/Tuesday, October 31, 1989, Department of Labor, Occupational Safety and Health Administration, 29 C.F.R. Part 1926, [Docket number S-204] RIN 1218 AA 36. Where the spacing of stringers and cross bracing specified in Rule Number 23 are such that the contractor can not adequately and in a practical manner carry on his operations, he shall submit to the professional engineer or registered architect for approval alternate designs for sheeting or shoring with all bracings as may be necessary to comply with the intent of Rule Number 23;
(2) Sheeting and forms shall be removed in accordance with the latest department's standards and specifications unless otherwise noted on the drawings or instructed by the professional engineer or registered architect;
(k) Storm drainage note.
(1) Provisions for the safe disposal of storm water shall be determined by the New York City Department of Buildings (NYCDOB), Department of Transportation (NYCDOT), and the Department of Environmental Protection (NYCDEP);
(2) Owner-builder shall comply with the provisions of the land-contour law so that construction operations will not create nor perpetuate any hazardous condition. In addition, he or she shall provide the necessary means to control the erosive velocity of overland flow and the conveyance of sediment to the sewer or street area;
(l) Dewatering note. If the contractor is required to install a temporary dewatering system to lower the groundwater level within the Boroughs of Brooklyn or Queens, it will be necessary that he or she obtain a New York State Department of Environmental Conservation (NYSDEC) Long Island Well Permit.
All drainage proposals and private sewer or private drain plans submitted to the department shall be accompanied by two sets of the survey of the proposed development and the location and route of the proposed private sewers or private drains in conformance with the requirements of 15 RCNY § 23-02(6), and shall contain the following information at a minimum: The survey shall show the existing elevations at each fifty (50) foot stationing and at all grade changes for all existing streets (center lines, curb lines, property lines), legal grade elevations, existing sewers, drains, ditches, watercourse(s), catch basins, manholes, utilities, culverts, all boundaries and buffer zones for all wetlands, designated open space areas, wildlife sanctuaries as established by the federal, state, or local agencies having regulatory jurisdiction thereof, and grades within the site of the Proposed development. The survey shall be prepared, signed and sealed by a professional land surveyor licensed by the State of New York.
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