Improvement plans shall include the following information:
(A) Approved preliminary plat;
(B) Grading, excavation and embankment.
(1) All excavation and construction of embankments shall be in accordance with the specifications. The embankment or fills shall be placed in six-inch layers and thoroughly compacted.
(2) The grades of all streets shall not be greater than 10%. Vertical curves shall be designed for a minimum 30 mph speed limit with a minimum stopping sight distance of 200 feet. Where curvilinear horizontal alignment is utilized, the minimum centerline radius shall be 100 feet.
(C) Erosion control. No building permit shall be issued unless the application therefore, particularly the items of information specified in division (C)(4) below demonstrates compliance with the principles and demonstrates compliance with the principles and standards set forth in division (C)(3) below.
(1) Purpose.
(a) The purpose of this division (C) is to safeguard persons, protect property, prevent damage to the environment, and promote the public welfare by guiding, regulating and controlling construction activities which disturb or break the topsoil or otherwise result in the movement of earth on land situated in the city.
(b) The soil erosion plan and sedimentation control plan, which must be prepared by the developer, shall be approved by the County Soil and Water Conservation District and submitted with final construction plans. The developer will be responsible for implementing and maintaining the plan until all improvements have been accepted by the city per applicable sections of this chapter. Should the developer fail to properly implement and maintain the plan, all inspections will be stopped, thereby effectively stopping all construction activities, until the developer corrects the infractions or pays the fee required by the city to have the situation corrected.
(2) Exceptions. The provisions of this division (C) shall not apply to the following construction activities:
(a) Excavation of below final grade for the basement and footings of a single-family residence and appurtenant structures on a site in excess of three acres;
(b) Agricultural use of land, including the implementation of conservation measures included in farm conservation plan approved by the Soil and Water Conservation District, and including the construction of agricultural structures; and
(c) Installation, renovation or replacement of a septic or aerobic system to serve an existing dwelling or structure.
(3) Principles and standards. No proposed construction shall be authorized unless the building permit application indicates that measures taken to control erosion and sedimentation will be adequate to assure that sediment or soil is not transported from the building site by any construction activities or by a storm event of 100-year frequency or less, and that the following principles will be applicable to all phases of any clearing, stripping, excavating, filling, grading, construction or other activities involving the disturbance of the natural terrain or vegetative ground cover.
(a) Development should be related to the topography and soils of the site so as to create the least potential for erosion. Areas of steep slopes where high cuts and fills may be required should be avoided wherever possible and natural contours should be followed as closely as possible.
(b) Natural vegetation should be retained and protected wherever possible. Areas immediately adjacent to natural watercourses should be left undisturbed wherever possible.
(c) The smallest practical area of land should be exposed for the shortest practical time during development.
(d) Sediment basins, debris basis, desilting basins or silt traps or filters should be installed and maintained to remove sediment from run-off waters from land undergoing development.
(e) The selection of erosion and sedimentation control measures should be based on assessment of the probable frequency of climatic and other events likely to contribute to erosion and on evaluation of the risks, costs and benefits involved.
(f) In the design of the erosion control facilities and practices, aesthetics and the requirements of continuing maintenance should be considered.
(g) Provisions should be made to accommodate the increased run-off caused by changed solid and surface conditions during and after development. Drainageways should be designed so that their final gradients and resultant velocities of discharges will not create additional erosion.
(h) Permanent vegetation shall be installed (or planted) in the soil covering an area of 25 feet back from the curb immediately (i.e., not more than 30 days) after construction of the street.
(i) Construction practices shall be such so that no sediment or soil is transported from building or development site onto adjacent sidewalks, curbs, streets or neighboring properties. Erosion control measures shall be designed in accordance with the standards and requirements contained in Procedures and Standards for Soil Erosion and Sedimentation Control in Illinois, adopted by the County Soil and Water Conservation District, and the I.E.P.A. Standards and Specifications for Soil Erosion and Sediment Control, which standards and requirements are hereby incorporated into this chapter by reference.
(4) Information. Each building or parking lot permit application shall be accompanied by a site plan as required in § 111.6 of the BOCA Building Code and include a description of all soil and erosion and sedimentation control measures to be taken to meet the objectives of this chapter throughout all phases of construction including lot specific utility company work as well as permanently after completion of construction on the site. Each permit issued shall clearly state that the property owner has the ultimate responsibility for compliance with the provisions of this division (C). The permit application shall include the name and phone number of the person to be contacted by the Building Official in case of a problem under this section. Should the person fail to correct the problem satisfactorily to the Building Official within 12 hours, the official shall hire a contractor to perform the work. In such case, the property owner shall be responsible for any and all expenses incurred by the city. Should the Building Official deem the condition to be of such severity that immediate mitigation is necessary, he or she shall so advise the contact person and ensure that the hazard is removed. If immediate mitigation requires the Building Official to hire a contractor to perform the work, the property owner shall be responsible for any and all expenses incurred by the city.
(5) Maintenance. The maintenance of drainage easements, drainage ways and drainage systems shall be the responsibility of the lot owner or adjacent lot owners. No tree or structure shall be placed or erected in any easement for utility or drainage purposes and the proper authorities may have free access to and use the easements at any time.
(D) Streets. All streets shall be graded as hereinafter provided. All street construction shall follow guidelines outlined in the most recent edition of the state’s Department of Transportation’s Standard Specifications for Roadway and Bridge Construction.
(1) All new streets, which are created and dedicated for use within a subdivision shall be graded, drained and surfaced in accordance with the minimum requirements hereinbelow set forth, and in a manner which will provide complete and adequate drainage of all streets, alleys and public grounds in the entire subdivision; including any such work which may be necessary in order to provide adequate and satisfactory drainage along the side of any existing public road or street which lies adjacent to the subdivision.
(2) In general, all such new streets within the subdivision and all work to be undertaken thereon shall be constructed according to the Standard Specifications for Road and Bridge Construction, adopted and amended by the state’s Department of Transportation and the related highway standards, all of which are in effect at the time the subdivision is being constructed, except as provided herein.
(a) Roadway and side slopes. The roadway shall be considered to be that part of the improvement which lies between the property lines, and which roadway shall not be less than 50 feet in width and shall be constructed substantially in accordance with the typical cross-sections shown on standards attached to the ordinance codified herein; and turnarounds or cul-de-sacs at the end of dead-end streets shall be laid out and constructed substantially in accordance with Standard No. 5 attached to the ordinance codified herein. The roadway shall be seeded in accordance with Standard Specifications. The contractor and/or developer shall assume responsibility for maintaining the roadway, including the seeding, the removal of earth, crushed stone or other debris from the pavement, curb and gutter and other drainage facilities for a period one year after acceptance by the city. The contractor or developer shall take immediate action for compliance upon notification by either the city or Engineer or the Superintendent of Streets or one of their representatives.
(b) Alleys. Alleys shall not be less than 20 feet in right-of-way width, of which not less than 16 feet in width shall be paved in accordance with standards and specifications herein provided; except that, such alleys shall not be required to have concrete curb and gutter.
(3) Portland cement concrete pavement. All rigid pavement shall consist of seven inches of unreinforced portland cement concrete on six inches of lime modified subgrade. If approved by the City Engineer, four inches of aggregate sub base may be used in lieu of six inches of lime modified subgrade.
(a) Longitudinal joints shall be constructed in accordance with the Standard Specifications and the illustrations included herein.
(b) Transverse joint spacing shall not exceed 15 feet and shall be constructed in accordance with the Standard Specifications and the illustrations included therein.
(c) Transverse construction joints shall be tied with #4 bars spaced at 12-inch centers 30 inches long and must be at least five feet from a contraction or expansion joint.
(d) All construction joints shall be sawn or tooled to provide sufficient reservoir for joint sealer.
(e) Pavement expansion joints shall have three-fourths inch diameter by 18 inches long, smooth dowel bars greased or fitted with end cap providing two-inch expansion placed 30 inches on center. Expansion joint material to be equivalent to “Homex-Plus” with bond breaker. After removal of top filler, joint to be sealed per (6).
(f) All joints shall be sealed with hot poured joint sealer, self-leveling polyurethane sealer, black color or other sealer approved by the City Engineer.
(4) Bituminous concrete pavement.
(a) All flexible pavement shall be constructed of two inches of bituminous concrete surface course Class I - Type 2 on four inches of bituminous base course on a six-inch lime modified subgrade, in accordance with the applicable provisions of the standard specifications.
(b) Alleys where permitted shall have not less than three inches of bituminous concrete surface, on eight inches of compacted base course and shall be constructed in accordance with the standards provided herein.
(5) Combination concrete curb and gutter. Combination concrete curb and gutter shall be built in accordance with the detail shown on Standard No. 2 and in accordance with the standard specifications.
(a) Curb and/or gutter may be constructed monolithically or separately in conjunction with the portland cement concrete pavement.
1. If constructed separately one-half inch round steel tie bars spaced at 30-inch centers will be required to tie the gutter flag to the PCC pavement.
2. Construction joint between curb and gutter and pavement shall be sawn or tooled sufficiently to provide reservoir for joint sealer.
3. All construction joints to be sealed with hot poured joint sealant, self-leveling polyurethane sealer black color or other sealer approved by the City Engineer.
(b) Contraction joints and expansion joints shall be installed in the curb and/or gutter, in prolongation with joints in adjacent PCC pavement.
1. Contraction joints, when sawed or template formed, shall be sealed in accordance with the Standard Specifications.
2. Expansion joint filler shall be equal to “Homex-Plus” with bond breaker. After removal of top filler, expansion joint shall be sealed as per construction joints.
3. A one and one-fourth inch diameter, 18-inch long smooth coated dowel bar, greased or fitted with end cap providing a minimum of two-inch expansion shall be placed in the gutter section at each expansion joint. (See Standard No. 6.)
(c) When curb and gutter is constructed adjacent to flexible pavement, a one-inch expansion joint shall be installed at points of curvature for short-radius curves and at construction joints.
1. Contraction joints shall be placed between expansion joints at distances not to exceed 25 feet and sealed in accordance with the Standard Specifications.
2. Expansion joints shall be per divisions (D)(5)(b)2. and (D)(5)(b)3.
(d) The flow line of any combination curb and/or gutter section shall have a fall of at least 0.3 of a foot per 100 lineal feet, except where vertical curves in the grade line of the street make these provisions inapplicable with respect to the curb and gutter.
(6) Drainage and storm sewers.
(a) In addition to the installation of curbs and gutters as required by division (D)(5) above, the subdivider shall make adequate provisions for the disposal of storm water throughout the entire subdivision.
(b) Facilities shall be provided to satisfactorily accommodate the surface run-off incident to the ten-year design storm by utilization of the “rational method” or the “SCS method” or both.
(c) Pipe culverts/storm sewer materials and construction shall conform to the applicable sections of the standard specifications, and shall be either reinforced concrete pipe meeting the requirements of AASHTOM 170, or precoated galvanized corrugated steel pipe meeting the requirements of AASHTOM245 and M246 sheet coated with polymer coating thickness of 0.010 in. (0.25 mm) on both surfaces, or aluminized steel Type 2 corrugated culvert pipe and aluminized steel Type 2 corrugated pipe arch meeting the requirements of AASHTOM274. Bands shall be precoated, the same as pipe culverts, and no metal pipe joints will be permitted under paved surfaces unless proposed lengths exceed 40 linear feet and are approved by the City Engineer.
(d) The minimum diameter for across road culverts shall be 15 inches.
(e) The minimum diameter for storm sewers shall be 12 inches.
(f) Minimum gradient shall be 0.3.
(7) Inlets/catch basins.
(a) Inlets shall be placed at locations required to handle the run-off within certain design controls and wherever necessary so that surface water is not carried across any street or intersection.
(b) Inlets/catch basins shall be constructed in accordance with Standard No. 3.
(c) Maximum permissible encroachment of water on the pavement shall be ten feet.
(8) Improvements of a higher type. The requirement above set forth, with respect to street drainage and surfacing, are to be considered as minimum requirements and nothing contained herein shall be construed to mean that the subdivider cannot construct or provide improvements of a higher type, if he or she so desires.
(E) Storm water. Storm water management shall be required for all developments. Any person, firm, corporation or other entity proposing to construct buildings or develop land within the jurisdiction of the city shall prepare, for approval by the City Engineer, a Storm Water Management Plan that described the manner in which erosion, sediment and run-off resulting from the development will be controlled and managed. No building or construction permits or plat approval shall be issued by the City until the Storm Water Management Plan has been approved by the City Engineer as meeting the requirements of this chapter, or the requirement for such Storm Water Management Plan has been waived by the City Engineer. Downstream property owners, watercourses, channels or conduits shall not receive storm water run-off from proposed upstream developments at a higher peak flow rate than would have resulted from the same storm event occurring over the site of the proposed development with the land in its natural, undeveloped conditions, nor shall storm water run-off exceed the capacity of the natural drainage system.
(1) Storm water run-off resulting from a proposed development shall be detained on-site:
(a) By wet or dry bottom reservoirs;
(b) By underground reservoirs;
(c) On flat roofs, parking lots or streets; or
(d) By other detention methods approved by the City Engineer.
(2) For purpose of designing adequate on-site detention facilities, the Illinois State Water Survey rainfall data for this region shall be used.
(3) The following general design features shall apply for this chapter.
(a) Detention basins. Basins may be constructed to temporarily detain the storm water run- off so that the rate at which it is released is the same rate as before development. The following features shall be incorporated into the design of any detention basin:
1. Storage volume:
a. The volume of storage provided shall be sufficient to store flows both during and immediately after the maximum storm event which can be expected to occur every ten and 100 years.
b. After the storage volume has been determined as required above, a one-foot freeboard shall be added to the dam height.
2. Outlet control works:
a. Outlet works shall be designed to limit peak outflow rates from detention storage areas to or below peak flow rates that would have occurred prior to the proposed development.
b. Outlet works shall not include any mechanical components or devices and shall function without requiring attendance or control during operation.
3. Concrete swale;
4. Spillway. Emergency spillways shall be provided to permit the safe passage of run- off generated from a 100-year storm.
5. Maximum depth. The maximum planned depth of storm water stored shall not normally exceed four feet.
6. Side slopes. The maximum side slopes for grassed basins shall not exceed one foot vertical for two feet horizontal (2:1 slope) for basins less than equal to four feet deep; for basins greater than four feet deep the maximum side slope shall not exceed 3:1.
7. Limits of ponding. In no case shall the limits of maximum ponding be closer than 30 feet horizontally from any building and less than two feet vertically below the lowest sill elevation.
8. Interior drainage. The basin bottom should be designed to drain expeditiously. If the bottom is to be grass, it should have a minimum slope of 1%.
9. Low flow channel. Small flows through the detention basin should be handled by paved ditches from inflow structure to outflow structure to minimize erosion.
10. Multi-purpose basins. If the detention basin is to have other uses, the design of the basin bottom should include underdrains to expedite drying of the bottom between run-off events.
11. Aesthetics. Designs should result in aesthetically pleasing configurations which will enhance public acceptability.
(b) Retention ponds. Retention ponds may also be used to temporarily detain the differential run-off from the development. In addition to the general design features enumerated above for detention basins, the following features should also be incorporated into the design of any retention pond.
1. Normal pool depth. In order to minimize weed growth, the normal pool depth should be four feet.
2. Depth for fish. If fish are to be kept in the pond, at least one-quarter of the area of the permanent pool should have a minimum depth of ten feet.
3. Facilities for emptying. In order to ease cleaning of the pond or shoreline maintenance, the pond design should include provisions for emptying the pond.
4. Low flow bypass. The design of any pond may include a low flow by-pass channel or pipeline to divert run-off that can be accommodated by downstream drainageways.
5. Bank stabilization. In order to minimize the effects of waves or ice, some type of bank stabilization such a rip-rap or concrete should be placed along the normal pool shoreline.
6. Side slopes below normal pool. The side slopes below the normal pool elevation may exceed the maximum side slope permitted above normal pool. The design shall, however, include provisions for a safety ledge having a depth of water not greater than three feet immediately adjacent to the shoreline.
(c) Rooftop storage. Detention storage may be met in total or in part by detention on roofs. Details of such design, which shall be included in the building permit application, shall include the depth the volume of storage, details of outlet devices and downdrains, elevations of overflow scuppers, design loadings for the roof structure and emergency overflow provisions. Direct connection of roof drains to sanitary sewers is prohibited.
(d) Parking lot storage. Paved parking lots may be designed to provide temporary detention storage of storm water on all or a portion of their surfaces. Outlets will be designed so as to slowly empty the stored waters and depths of storage must be limited so as to prevent damage to parked vehicles.
(e) Other detention methods. All or a portion of the detention storage may also be provided in underground or surface detention facilities, to include basins, tanks or swales and the like.
(4) Designs of detention facilities shall incorporate safety features, particularly at outlets, on steep slopes and at any attractive nuisances to include, as necessary, fencing, hand rails, lighting, steps, grills, signs and other protective or warning devices so as to restrict access during critical periods and to afford some measure of safety to both authorized and unauthorized persons.
(5) The provisions of this subchapter shall be applicable in the following areas:
(a) Any residential development having a gross aggregate of five acres or more;
(b) Any residential development of less than five acres with a 50% impervious surface including roads, building, utility right-of-way and other improvements; or
(c) Any commercial, industrial, institutional or utility development having a gross aggregate area of one acre or more.
(6) The storm water detention facilities shall be built in conjunction with the storm sewer installation and be fully operational after the cleaning of vegetation.
(a) Silt and debris connected with early construction shall be removed periodically from the detention area to maintain full storage capacity.
(b) The maintenance responsibility of the detention area shall remain with the developer and/or contractor until final inspection and applicable escrows are released.
(c) Before final plat approval, the developer shall submit his or her commitment for future maintenance responsibility of the detention area.
(7) When applicable, the provisions of this division (E) shall be reviewed by the City Engineer to assure compliance.
(F) Sanitary sewers.
(1) General requirements. In order to promote unified development of sanitary sewers, faster and more efficient plan review and subsequent acceptance of sewers, the following guidelines shall be established and included on plans.
(a) Sewer line installation shall not commence until a water pollution control permit and complete set of plans have been approved by the Environmental Protection Agency of the state and the city and are on file in the office of the Director of Wastewater Plant and Sewer Lines.
(b) The contractor is responsible for contracting the Wastewater Division at least 48 hours prior to installing sanitary sewers, and before performing any sanitary sewer testing.
(c) The contractor will be required to jet and clean all storm and sanitary sewers that collect mud, debris, concrete, building supplies and the like while the work is under the responsibility of the contractor.
(d) All laterals shall be furnished with an air tight cap to facilitate air testing. The PVC lateral shall be extended four feet above the finished grade ground surface to allow relocation of the lateral in the future. The builder/developer is responsible for all capped service laterals throughout build out of the development. Broken laterals will be promptly repaired.
(e) The builder/developer is responsible for all manhole elevations throughout build out of the development. No manhole covers can be covered. Location signs for manholes to be provided by contractor.
(f) Disclaimer that neither the city accepts responsibility for the project design and/or construction of this project nor any other design consideration or standard utilized in this project. The permittee and the design engineer are responsible for meeting or exceeding all pertinent federal, state or local codes or standards both on and off the site.
(g) All traffic control shall be the responsibility of the contractor until the city accepts the project improvements. All warning signs, traffic-control signs and regulatory signs shall conform to the state’s Department of Transportation Manual on Uniform Traffic-Control Devices.
(h) The contractor shall leave the site in a condition equal to pre-construction conditions. The contractor shall not disturb property outside of this area.
(i) All work and construction activities shall be confined to the right-of-way and easement, if applicable. The contractor shall not disturb property outside of this area. Should property outside the right-of-way be disturbed or damaged, the contractor shall be responsible for restoring the property to its original condition to the satisfaction of the property owner, with no additional compensation.
(j) A 15-foot minimum sewer easement will be required. However, wider easements may be required due to the depth of pipe and pipe diameters as determined by the city.
(k) At creek crossings or near creek embankments, contractor shall provide filter mat (as specified in IDOT standard specifications) and shall be installed in accordance with manufacturer’s instructions. Rip rap shall also be provided and installed in accordance with IDOT Standard Specifications.
(l) The contractor shall be responsible for repair of all underground facilities, utilities and drain tile damaged during construction.
(m) The contractor shall supply submittals for all equipment and appurtenances to the Wastewater Director and City Engineer for approvals, three copies will be retained by the city.
(n) The contractor shall provide record drawings which shall be submitted to the Wastewater Department and City Engineer’s office. Sewer connections shall be recorded by measuring the number of feet from the downstream manhole, and shall indicate the length of offset from the sanitary sewer main and depth of lateral at its terminus point. All structures shall have record elevations.
(o) Sewer tap permits will not be issued until after the underground plumbing inspection has passed. All rough-in plumbing above grade will be capped. Floor drains will be temporarily sealed with a screw-in type plug and commercial grade duct tape. Tap-ins will be rejected due to non- conformance with these requirements.
(2) Specifications.
(a) Sanitary sewer pipe material shall be ductile-iron or at a minimum SDR 26 PVC pipe meeting the requirement of the latest edition of the Illinois Standard Specifications for water and sewer main installation. Joint material for PVC pipe shall meet the requirements of ASTM D3212. Ductile-iron pipes shall have gray-iron or ductile-iron fittings as per the Standard Specifications. Lubricant shall be suitable for lubricating the joint components. It shall have no deteriorating effect on the gasket or pipe material and no detrimental effect on the quality of wastewater to be carried by the pipe.
(b) Sanitary sewer pipe bedding shall be Class A crushed gravel or stone conforming to IDOT Graduation CA-7 and shall be installed per ASTM 2321-83A.
(c) All sanitary sewer manholes shall be constructed of precast concrete and conform to ASTM castings ASTM A48-83 Class 35B, or ASTM A536-80 Grade 65-45-12 for ductile-iron. Cones and sections shall be substantially free from fractures, large or deep cracks and surface roughness. Joints shall be sealed with Ran-neck pre-molded joint sealer or equivalent. Sanitary sewer manhole lids shall have the word “Sanitary” cast in the face and be furnished with a concealed “Pick Hole”. Sanitary sewer manhole frame and covers shall be Neenah R-1772 or equivalent. In areas subject to flooding, sanitary sewer manhole frame and covers shall be Neenah R-1915 bolt down lids. All sanitary sewer manholes located in or adjacent to drainage ways shall have the frames elevated to one foot above the 100-year water surface elevation.
(d) Manholes shall be constructed with a silica fume admixture specifically to prevent hydrogen sulfide corrosion of the pre-cast concrete. Submittals detailing the type of silica fume admixture and its suitability for this application shall be submitted to the Wastewater Director for approval. Rheomac SF-100TM and Rheobuild 1000TM or approved equals shall be used in the manufacture of the manhole component sections.
(e) Sewer pipe connections shall be flexible water tight connections conforming with ASTM C-923 “standard specifications for resilient connectors between reinforced concrete manhole structures and pipe”. The pre-cast base section shall be monolithically constructed with a pre-cast invert to align all sewer pipes to the elevations as shown on the plans.
(f) If a gasketed connection does not exist, all connections to existing manholes shall be made by means of a mechanical cutting device. The device shall leave a round smooth hole, no larger than one-half inch greater than the outside diameter of the sanitary sewer pipe to be inserted. The cutting device shall also be capable of forming/cutting the necessary channel within the interior of the manhole. No pneumatic jack hammers, hand held saws or sledge hammers shall be allowed. The opening shall be sealed with a Link Seal or other approved mechanical device.
(g) When connections are to be made to existing structures, the contractor shall field verify the location and elevations of the structure prior to making the connection. The contractor shall notify the owner and engineer if the existing structures are found to be different than shown on the drawings.
(h) Protection of the water main from sanitary sewer mains is required and shall be made in accordance with latest edition of Title 25: Environmental Protection, Subtitle F: Public Water Supplies, Ch. 11: Environmental Protection Agency, § 653.119: Protection of Water Main and Water Service Lines. The water and sewer main as delineated on the drawings shall be constructed with a minimum of ten feet horizontal separation and one and one-half foot vertical separation.
(i) Steel casing pipe shall meet or exceed ASTM A-139, Grade B. Pipe joints shall be welded in accordance with AWWA C-206. The interior and exterior of the bore casing shall be coated with a minimum of one mil of bituminous asphaltic material.
(j) Casing spacers shall be Model CCS as manufactured by Cascade Waterworks MFG of Yorkville, IL or prior approved equal. Carrier pipe shall be inserted within a casings 30 inches in diameter or larger, with six-foot spacing; also, a spacer shall be placed so at to support the carrier within two feet of the end of the casing pipe.
(k) Rubber end seals shall be installed at ends of the casing. Cascade Waterworks MFG of Yorkville, IL or approved equal shall manufacture seals.
(3) Testing.
(a) A visual inspection, including lamping, shall be made of all gravity flow lines; and all obstructions shall be removed. Any sewer showing less than one-half the cross sectional area of the pipe between adjacent manholes or other undue deviation from line and grade shall be considered as unsatisfactory and shall be repaired by the contractor without additional compensation.
(b) Testing of sanitary sewers for acceptability shall be conducted by the exfiltration by air testing technique. The contractor shall be required to test all gravity sewer mains. All testing shall be in conformance with the air testing techniques as specified in the latest edition of the state’s Standard Specifications for Water and Sewer Main Construction. The city requires that pressure “hold” in the pipe for double the time limit listed in the Standard Specifications.
(c) The gravity sewer lines (excluding service laterals) shall be tested for excess deflection by pulling a mandrel through the pipe from manhole to manhole.
1. The outside diameter of the test mandrel shall be equal to 95% of the original inside diameter of the pipe being used. The individual lines to be tested shall be so tested no sooner than 30 days after they have been installed. Wherever possible and practical, the testing shall initiate at the downstream lines and proceed towards the upstream lines.
2. Where deflection is found to be in excess of 5% of the original pipe diameter, the contractor shall excavate to the point of excess deflection and carefully compact around the point where excess deflection was found. The line shall be retested for deflection. However, should be deflected pipe fail to return to the original size (inside diameter) after the corrective measures, the line shall be replaced. The entire system shall be tested. Deflection testing and possible repair and replacement, as stated above, shall be incidental to the construction of sewer pipe; and no additional compensation will be provided. Any repaired sections will require video inspection at contractors cost.
(d) Upon request from the Wastewater Director, an approved company shall televise all sanitary sewer mains. An electronic video copy denoting the manhole number, distance between laterals and manholes shall be depicted on the video. The manhole number on the video shall be the manhole number shown on the plans for the development and the corresponding city designated manhole number. A report in eight and one-half inch by 11-inch format shall be submitted detailing the results of the video. The video and the report shall identify all observed construction deficiencies, pipe material flaws and the like. The report and a copy of the video shall be submitted to the office of the Wastewater Director.
(e) Vacuum testing of manholes shall conform to ASTM C-1244-93 standard method for concrete sewer manholes by negative air pressure. All sanitary sewer manholes shall be vacuum tested. Manholes that fail this test will be excavated, cleaned and all joints shall be wrapped on the outside with nine-inch RUB’R-NEK concrete joint wrap or equivalent.
(f) A copy of all testing results, showing a minimum of the initial test pressure, final test pressure, the duration of the test, fail or pass, and mandril results shall be submitted to the Wastewater Director prior to final acceptance of the development. The test results shall be certified by a licensed engineer.
(g) All tests shall be conducted in the presence of a representative of the city. Twenty-four hours’ notice shall be given prior to commencing any tests.
(4) Lift station/force main requirements.
(a) All subdivision developers will make every attempt to plan and design sanitary sewage systems for gravity flow to the city’s existing sewage system.
(b) If gravity flow is not possible, a sewage pumping station will be required and must be built to the city’s sewage pump station specifications on file at the Wastewater Division Office. Pump station design and specifications will be strictly enforced.
(c) All work, installation, procedures, materials, testing and the like for sanitary sewer shall conform to the Standard Specifications (water, storm and sanitary). Sanitary sewer force mains shall be polyvinyl chloride (PVC) sewer pipe conforming to ASTM D-2241 with an SDR-26 and joints conforming to ASTM 3132. Tracer wire will be buried with all force main pipe.
(d) Ductile-Iron flanged pipe shall conform to ANSI/AWWA A21.10/C151 Class 52. The coating shall be applied to the outside of all pipes, unless otherwise noted. The inside coating shall be lined with 40 mil nominal dry film of “Protecto 401” or “Polybond Plus”. The weight, class or nominal thickness, and casting period shall be shown on each pipe. Joints shall be in conformance with ANSI/AWWA B16.1/C110.
(e) Sanitary sewer force main pipe bedding shall be Class A crushed gravel or stone, conforming to IDOT Graduation CA-7, and shall be installed per ASTM 2321-89.
(f) The contractor shall keep existing sewer facilities in operation during construction of the proposed facilities.
(g) When connections are to be made to existing structures, the contractor shall field verify the location and elevations of the structure prior to making the connection. The contractor shall notify the owner and engineer if the existing structures are found to be different than shown on the drawings.
(h) Protection of the water main from sanitary sewer is required and shall be made in accordance with the latest edition of Title 35: Environmental Protection, Subtitle F Public Water Supplies, Ch. 11: Environmental Protection Agency, § 653.119: Protection of Water Main and Water Service Lines. The water and sewer main as delineated on the drawings shall be constructed with a minimum of ten feet horizontal separation and one and one-half foot vertical separation.
(i) The force main shall be hydrostatic pressure tested at a pressure of 50 PSI and a leakage test shall be performed both in accordance § 41-2.13, Pressure Testing of Water Mains, of the state’s Standard Specification for Water and Sewer Main Construction.
(j) Tracer wire shall be THWN Soft Drawn No. 12 Copper and shall be connected to all valves and brought up, looped and fastened at the top for accessibility. Tracer wire shall be extended up all valve pits and boxes and fastened to the side of the pit or box to insure that the tracer wire will not become tangled around the valve wrench and broken.
(k) Splicing kits will be used for all splices in the tracer wire. For splices that will be buried or exposed to water 3M DBY/DBR Direct Bury Splice Kits shall be used. #M Scotchlok R splicing kits will be installed at dry locations.
(l) Contractor shall perform a conductivity test on the tracer wire after installation by the direction of the city. All testing is to be observed by the city.
(m) Should the tracer wire not pass testing, the contractor shall make the necessary repairs without additional compensation for the tracer wire to pass the test.
(5) Submittals. The following are additional requirements:
(a) Construction plans. The above shall contain complete information on connection to the existing sewer system, sizes, slopes, proposed rim and invert elevations, topography, right-of-way, existing easements, proposed easements and a visual representation of the 100-year flood elevation;
(b) Two additional sets, above the number you wish returned, of the EPA permit application. Applications must be signed by permittee, and signed and sealed by the design engineer; and
(c) Two CD-ROMs containing drawing files of the following in the latest Auto CAD and PDF formats (to be verified with city prior to submission):
1. Boundary, lot lines, sewers, rights-of-way and easements;
2. Sewer plan and profiles; and
3. Provide state plane coordinates of two points on the development.
(6) Construction.
(a) The permittee shall notify the City Wastewater Division of the date and schedule of construction.
(b) Proper dewatering of the sewer trench is the responsibility of the contractor. Dewatering into the city’s sewer system is strictly forbidden. Connection(s) to the city’s existing sewer system will be plugged and set over manholes will not be broken open until all sewers have been installed, inspected and approved.
(c) The city requires that the permittee retain a qualified licensed professional engineer to observe the sewer construction periodically, to determine conformance with plans and specifications.
(7) Acceptance. Prior to accepting the sanitary sewers, the following items shall be completed/submitted.
(a) All, air, mandrel, video inspection and manhole tests completed and results submitted. These must be sealed by a professional engineer. All lines must be jet cleaned prior to tests.
(b) If applicable, sewer pumping stations must be operational. All testing and start up reports must have passed, be certified by the pump manufacturer and design engineer, and on file at the office of the Wastewater Director.
(c) A notarized certification, to be delivered to the office of the Director of Wastewater Plant and Sewer Lines, by the installing contractor that he or she has installed all the sewers and treatment facilities in accordance with the permits, plans as stated in Section 1 of this code.
(d) Upon completion of the project as shown on the approved plans, submission of two 25-inch by 36-inch and three 11-inch by 17-inch record drawings (as-builts) showing constructed manhole invert elevations and exact locations of manholes, service laterals and tee/wye locations referenced to downstream manhole. Size and type of pipe shall also be on the drawings. All data provided shall be geographically referenced to the Illinois State Plane West (US Feet) coordinate system. Furthermore, all data shall be provided in a format compatible with the city’s GIS system. Acceptable formats include .DWG’s, shape files and geo-databases. If possible, multiple formats shall be provided to the city.
(e) Upon completion of the project after all required testing has been done, a final inspection will be made by city personnel. The final inspection will not be conducted until “Record” plans are submitted. Final inspection will be made at the requests of the owner. Defects noted must be corrected and a reinspection made before acceptance. Improvements found not as depicted on the submitted “Record” plans shall be rejected.
(f) After all defects, if any were noted during final inspection, have been corrected and prior to any sewer permits being issued, a maintenance bond in an amount equal to 50% of the construction cost shall be filed with the City Clerk. The bond shall be for a period of three years, commencing on the date of final inspection or reinspection if necessary, and shall cover all defects in materials and workmanship. The bond shall be binding on the developer or the contractor.
(g) All easements gathered by the permittee(s), across private property that is not contained within their development, shall be assigned/conveyed to the city by the permittee(s) free and clear of any and all liens and encumbrances without cost to the city.
(h) At the time of acceptance of the sewer extension, title to it shall be transferred and conveyed to the city, by the permittee(s) free and clear of any and all liens and encumbrances, without cost the city. Upon expiration of the permittee’s maintenance bond (three years after acceptance of the sewers), the city shall assume all costs of maintenance and repair of such extension.
(i) No sewer tap permits will be allowed until all applicable requirements have been completed and a letter of acceptance has been received from the Director of Sewer Plants and Sewer Lines.
(G) Monument sign. The developer shall be required to submit with the improvement plans, detailed construction plans for ay and all signs for the subdivision. Said plans shall include location map, sign construction plan, landscaping and lighting details.
(H) Street lights. The developer shall submit with improvement plans a play detailing photometrics of the streetlights proposed. The plan should include location of street lights and detail showing the type of light and pole to be installed, as well as a photometrics plan.
(I) Street signs. Aluminum street signs must be installed by and at the expense of developers of subdivisions in accordance with the size and standards of street signs now in use or hereafter used in the city or ornamental street signs only as approved by City Council.
(J) Traffic control. All traffic-control devices, including stop lights, stop signs and the like, shall be installed at the expense of the developer, in accordance with the size and standards now in use or hereafter used in the city or ornamental street signs only as approved by City Council.
(K) Street entrance. Permission must be first obtained from the City Engineer for the entrance or connection of a new street or public way to any existing street or public way.
(L) Culverts. The size, location and grade of culverts, where necessary, shall be determined by the City Engineer; provided, however, that, nothing less than a 12-inch culvert shall be installed.
(M) Drainage easements.
(1) Easements for the purpose of draining surface water from public streets and across shall be provided. Drainage through these easements shall be over paved or tiled surface ways or in culvert/storm sewer systems, place at the proper grade to facilitate the flow of water; provided, development of a site cannot begin until a soil erosion and sedimentation control plan has been prepared by the developer and approved by the County Soil and Water Conservation District. This shall be a condition of improvement plan approval. The developer will be responsible for implementing and maintaining the plan until all improvements have been accepted by the city per applicable sections of this chapter.
(2) The provisions of the section shall not apply to the following construction activities:
(a) Excavation of below final grade for the basement and footings of a single-family residence and appurtenant structures on a site in excess of three acres; and
(b) Agricultural use of land, including the implementation of conservation measures included in farm conservation plan approved by the Soil and Water Conservation District, and including the construction of agricultural structures.
(N) Electronic copy. The developer shall provide to the City Engineer as-built drawings (mylar and electronic) for all sanitary sewer systems, storm sewer systems, and water distribution systems. Said as-built drawings will be required to be submitted before the City Council approves the final plat. If the developer files a performance bond in order to approve the final plat prior to acceptance and dedication of improvements, the drawings shall be submitted prior to the city’s acceptance of improvements.
(O) Maintenance during construction. During construction of the improvements, the developer and his or her contractors will not be allowed to let mud accumulate on street or let grass or weeds grow taller than eight inches. (See § 93.021 of this code of ordinances.)
(P) Construction entrance staging area. For each phase of construction, the improvement plans must show the area of the subdivision on which construction equipment will be stored. The improvement plans must also show, or describe, the ingress/egress plan for construction equipment. Construction entrances that have the least impact on neighboring properties should be used whenever possible.
(1960 Code, § 41-3-3) (Ord. 7128, passed 4-28-2008)