Standard Specifications for Improvements
Section III. Utilities
Control of storm water runoff shall be in accordance with City of Aurora Stormwater Ordinance (Kane County Stormwater Ordinance as adopted and amended by the City of Aurora). For storm water management requirements refer to Section IV of the City of Aurora Standard Specifications for Improvements.
The proposed storm sewer system shall be sized, at a minimum, to convey the storm water runoff generated during a rainfall event with a return frequency of not less than ten (10) years. The design peak runoff shall be determined using the modified rational method. The design rainfall intensity shall be determined from “Illinois State Water Survey Bulletin 70”, specifically Appendix A for Aurora and summarized below. Please note the table is only an excerpt from Bulletin 70 Appendix A and reflects the depth of rainfall in inches and the rainfall intensity (in/hr) for a 10-year frequency at the Aurora Station. The provided values can be interpolated to determine incremental intensity for various times of concentrations.
|Duration||Rainfall Depth (inches)||Intensity (inches per hour)|
The time of concentration used to determine the design rainfall intensity shall be calculated for the fully developed condition using Worksheet 3, as published in the SCS Technical 55 Manual.
The capacity of the storm sewer system must be determined by gravity flow only. The City will not allow siphons or pump stations to convey stormwater runoff. The design must disallow the effects of surcharging, with the exception of decreases in capacity due to tail water effects on outlets.
The storm sewer must be designed to have a minimum full flow velocity of three (3) feet per second.
The runoff coefficient shall be determined by the character of the land to be drained when fully developed using the following runoff coefficients:
- Grass - 0.30
- Impervious Surfaces - 0.96
Storm sewers of sufficient capacity shall be constructed throughout the entire subdivision and shall be connected to an adequate outfall. Intercepting storm water inlet or catch basin structures shall be provided at flow intervals not in excess of three hundred feet (300') as measured along the gutter line.
All stormwater runoff which flows overland into or out of a storm sewer system must enter or exit through a flared end section, slope box, or a poured in place headwall. Grates shall be required on all flared end sections. Two feet (2 ft) minimum cover above the top of the pipe shall be provided for all storm sewers.
The storm water drainage system shall be separate and independent of the sanitary sewer system. Storm sewer shall be constructed of reinforced concrete pipe (RCP) conforming to the “American Society For Testing Materials”. Designations C-76, wall thickness B. Other materials for storm sewers may be used in special cases upon the approval of the City Engineer. Existing ground water drain tiles shall be connected to storm sewers or shall be restored to operating condition at the direction of the City Engineer. Joints for concrete storm sewers eighteen inch (18") and less in diameter shall be of the bituminous mastic type, except when otherwise required by the Illinois Environmental Protection Agency or the City Engineer. All storm sewers that encroach within fifteen feet (15') of any building foundation shall be ‘O’-ring gasketed joints as per the A.S.T.M. C-443 specification.
Street grades and lot and block drainage shall be established so as to permit positive drainage to the storm sewer system. Parking lots shall be drained internally and directed to the storm sewer system where practical. Horseshoe drainage of individual lots should be avoided.
All rear yard inlet systems and sump pump collection pipes should drain toward the Right of Way. Rear yard inlet systems shall be designed so that the distance from the structure in the Right of Way to the furthest structure is less than four hundred feet (400'). Storm sewer trunk lines are not allowed in rear yard applications, unless approved by the City Engineer. Pipe materials for rear yard storm sewers shall be RCP.
Inlet and/or Catch Basin Castings
Inlet and/or catch basin frames and grates shall be Neenah No. R-3015 grate type R, or approved equal, when standard subdivision curb and gutter is installed. Other types may be used upon approval of the City Engineer. Where a continuous grade is carried across an inlet or catch basin casting, the open vane cover shall be used, Neenah No. R-3286-8V, East Jordan 7520 T1, or approved equal. When additional grate capacity is needed in low areas or as required by the City Engineer, Neenah No. R-3067 grate Type R shall be used or approved equal. In cases where storm sewer inlets are used in depressed curb areas, use Neenah No. R-3509. In rear yards, Neenah No. R-4342 shall be used.
In paved areas manhole castings shall be Neenah No. R-1713 frame and Type B cover, East Jordan 1051-3, or approved. In other non-paved areas, where closed lids are needed use Neenah No. R-1772-B, East Jordan 1022-1(medium cover) or approved equal. All type B covers shall have “CITY OF AURORA” cast into the top and shall be the concealed pick hole type. All Type B covers shall have a machined surface and a watertight rubber gasket seal. See section F. Final Adjustments for casting installation requirements.
All sump pump systems are to be connected to the public storm sewer system. The pipe shall be a four inch (4") minimum heavy duty PVC with cemented joints. The connection to the storm sewer shall be through a structure. After insertion of the sump pump discharge pipe into the structure, the joint shall be sealed with hydraulic cement. In no case shall the sump pump discharge pipe extend beyond the inner surface of the structure. All PVC pipe used for sump service stubs and collector lines shall be SDR 26 (see Exhibit III-A-2).
All individual sump pump lines shall be connected to a storm structure or sump pump collection line structure. Sump pump collection lines shall be six inches (6") diameter minimum. Sump pump collection lines shall have a cleanout/inlet structure at the upstream end and shall have a cleanout structure every three hundred feet (300') maximum. Sump pump cleanout structures shall be two foot (2') diameter structures and will not be allowed to pick up surface drainage. The frame and lid shall be Neenah No. R-1706-1 or approved equal. All sump pump service stubs shall be marked at the time of construction with a 4" x 4" hardwood post neatly installed vertically with a minimum three feet (3') bury and a minimum four feet (4') exposed. The top one foot (1') of the post shall be neatly painted white.
Specifications for Water and Sewer Main Construction in Illinois, and all requirements of Fox Metro Water Reclamation District must be met for any sanitary related work.
The minimum size sanitary sewer main is eight inches (8") diameter. The maximum allowable distance between manholes is four hundred feet (400'). The minimum sanitary service size is six inches (6") diameter. Service connections to mains shall be made with wyes or tees. “Insert-a-tee”, or approved equal, tapping systems may be used when connecting to an existing sewer main with a diameter of ten inches (10") or larger. Risers are required for all services when the main depth exceeds twelve (12) feet.
In addition, the design engineer shall provide documentation to the City that a permit has been received from Fox Metro WRD for the proposed improvements.
Separation between sanitary services and water services must be a minimum of ten (10) feet. If a minimum of ten (10) feet of separation cannot be achieved, an alternate design must be submitted which meets the requirements of the Specifications for Water and Sewer Main Construction in Illinois.
All sanitary sewers will be placed in the East / South side of the street, opposite to the water main, unless approved by the City Engineer.
All sanitary sewers greater than fourteen inches (14") will be owned and operated by the Fox Metro Water Reclamation District.
All sanitary sewer material specifications shall meet Fox Metro WRD latest material specifications. All sanitary sewers shall be PVC (Polyvinyl Chloride) plastic pipe. All pipe and fittings shall conform to Type PSM (ASTM – SDR series) in accordance with ASTM D-1784, D-3034 for SDR 26, D-2241, D-3212, F-412 and F-477. . The Standard Dimension Ratio (SDR) for PVC pipe shall be 26 as a minimum and shall be dependent on the depth of cover. All PVC plastic pipes and fittings shall have a cell classification of 12454-B or C, as defined in ASTM D-1784.
The following pipe materials shall be used for various depths:
|3.5' - 15'||PVC SDR 26|
|15.1' - 20'||PVC SDR 21|
|20.1' or deeper||PVC DR 18|
All public sanitary sewers will be air tested by the developer, at his expense, under the supervision of the City Engineer. A copy of the sanitary testing report shall be forwarded each to the Fox Metro WRD and the City Engineer.
A mandrel test will be done for all PVC pipe thirty (30) days after backfilling. All testing will be done in conformance with the “Standard Specifications For Water And Sewer Main Construction In Illinois”, current edition.
Vacuum testing shall be required in accordance with Fox Metro WRD standards. The Fox Metro WRD may require additional testing. One copy of the report for all testing shall be submitted to the City and Fox Metro prior to obtaining building permits.
All work and material shall be in accordance with City ordinances and with current “Standard Specifications For Water And Sewer Main Construction In Illinois”, latest edition, and the AWWA, American Water Works Association. In case of conflict, the more stringent of the requirements shall apply.
City water mains and hydrants shall be placed on the north and west sides of the streets unless approved otherwise by the City Engineer. All public water mains shall be looped, unless approved otherwise by the City Engineer and/or the Director of Public Works.
Component items of use in a water distribution system are included below.
Water mains shall be minimum eight inches (8") internal diameter with a cover of five feet (5') six inches (6") minimum below finish grade. Ten inch (10") diameter mains are not allowed.
Materials shall be:
- Ductile Iron Class 52, single gasket, double sealing pipe per AWWA C151/ANSI A21.51 latest edition with cement mortar lining per AWWA C104/ANSI 21.4 latest edition. (Griffin, Clow, American Cast Iron Pipe Co., U.S. Pipe & Foundry or approved equal are required)
- Ductile Iron Pipe joints shall conform to AWWA C111/A21.11 latest revision. Unless otherwise by the City Engineer, Ductile Iron Pipe joints shall be push-on type.
- All watermain shall be encased in polyethylene film in accordance with AWWA C-105-82.
Fittings shall be cement lined, tar coated ductile iron with mechanical joints rated 250 psi per AWWA C110/ANSI 21.10 latest revision or AWWA C153/A21.53 latest revision. Unless otherwise approved by the City Engineer, all fittings shall have mechanical joints conforming to AWWA C111/A21.11 latest revision. (Clow, Tyler, Union Foundry or approved equal are required). All the nut and bolts required for the installation of a fitting shall be stainless steel.
Brass wedges shall be installed per Section 41-2.05C of the Standard Specifications for Water and Sewer Construction in Illinois, dated May 1996, as amended.
The following valves shall be used for main lines:
|Diameter (inches)||Valve Type|
|8"||Resilient Wedge Gate Valves|
|12"||Resilient Wedge Gate Valves|
|Greater than 12"||Butterfly Valves|
Resilient Wedge Gate Valves may be used for watermain greater than 12" with the approval from the City Engineer or the Director of Public Works. All gate valves shall be American Flow Control, Mueller, Kennedy, U.S. Pipe & Foundry, or approved equal. Gate valves shall conform to ANSI/AWWA C-515-99 latest revision. Gate valves shall have mechanical joints and shall open to the left. All nuts and bolts shall be stainless steel.
All butterfly valves shall be Henry Pratt Company “Groundhog” Butterfly Class 150-b or approved equal per ANSI/AWWA C501 latest revision with mechanical joints and shall open to the left and be installed in valve vaults.
Valves shall be installed each second consecutive hydrant, at intersecting lines and other locations as to limit the water services affected by the watermain isolation to 12-15 services. Valves shall be installed wherever the main enters or exits the Right of Way. A minimum of two (2) valves shall be located at all tees and crosses.
All valves twelve inch (12") and larger require a sixty inch (60") diameter vault. Eight inch (8") valves require a forty-eight inch (48") diameter vault. A valve box can be used for valves smaller than eight inches (8").
Gate valves shall be installed in each fire hydrant lead with “O” ring stuffing box.
CA-6 crushed compacted limestone shall be utilized to backfill all around the outside of the valve boxes and below the valve to prevent mud from penetrating valve box.
All valves on the water main, including fire hydrants leads, shall be provided with an adjustable valve box unless a valve vault is required. (They must be Tyler or an approved equal).
Valve vaults are required wherever valves are under pavement; pressure connections or butterfly valves are used. All vaults shall be precast concrete structures. Frame and lids for vault vaults shall be Neenah R-1712 and shall have “CITY OF AURORA” cast in the lid.
All tees, bends, fire hydrants, and valves shall be adequately blocked with poured-in-place thrust blocking as detailed in Exhibit III-C-3 herein against undisturbed earth.
In lieu of the above blocking, Megalug retainer gland Series 1100 as manufactured by EBBA Iron Inc. or approved equal (set screw retainer glands will not be accepted) or stainless steel rods will be acceptable restraint for mechanical joints in accordance with Exhibit III-C-8. If mechanical joints are restrained by Megalug glands or approved equal, the bell and spigot joints shall have to be restrained with Megalug Restraint Harness Series 1700 or approved equal a distance either side of the fitting per Exhibit III-C-9 and III-C-10. Locking gaskets will not be an acceptable alternative to restraining the bell and spigot joint.
For subdivision inspection, the mechanically restrained system has to be inspected prior to backfilling to verify the minimum distances were constructed in accordance with the specifications. Should the system be backfilled prior to inspection, the restraint system will have to be excavated by the contractor for inspection at no cost to the City of Aurora.
All nuts and bolts used for the mechanical fitting and restraint systems shall be stainless steel.
All hydrants shall be Waterous Pacer Model WB-67 (see Exhibit III-C-7).
Fire hydrants shall be installed throughout the subdivision at each intersection and at intervals not exceeding the requirements of Ordinance No. 4418 and O81-5012 or three hundred feet (300'), whichever is more stringent.
Hydrant installation shall have five feet six inches (5'6") depth of cover, six inch (6") lead with resilient wedge gate valve, six inch (6") mechanical joint shoe, breakaway traffic flange, pentagon nut and National Standard thread for fire service.
Centerline pumper nozzle shall eighteen inches (18") to twenty-two inches (22") above finish grade line (sidewalk to curb) or above ditch drain line. Adjustment to grade shall be made with Waterous Pacer barrel extensions or with Grade-Lok offset anchor couplings and move breakaway traffic flange up to grade level.
Base elbow of hydrant shall be properly thrust blocked and shall be provided with clean washed stone (CA-7) and covered with a 5 oz. Geotechnical non-woven fabric.
Fire hydrants shall be located on the property line except at corners and shall be set two feet (2') minimum and three feet (3') maximum from the back of curb to the face of the pumper nozzle. Where there is no curb and gutter, the face of the pumper nozzle shall be located five feet (5') from the paved road edge. All hydrants shall be oriented so that the pumper nozzle faces the roadway directly. All hydrants and any required adjustment fittings should receive one (1) coat of rustproof base federal safety red paint.
Fire hydrants installed as part of a development that are located within the ROW of major collectors and arterials shall have a permanent UV protected fiberglass flag installed on the hydrant such as Hydrafinder as manufactured by RoDon Corporation or approved equal. The flag shall be 5 ft tall, 3/8" diameter laminar matrix fiberglass shaft with four (4) red reflective stripes, mounted on a chrome plated carbon steel spring mount, that shall be bolted to the top flange of the hydrant.
Service connections materials and installation shall conform to ANSI/AWWA C800 latest revision.
All water services shall be constructed of Type K copper pipe of such diameter as specified by City Ordinance and in accordance with AWWA publication M-22 entitled, “Water Service Lines And Meters”. Service line diameter is dependent upon peak water demand and meter distance from the main. Minimum service diameter shall be one inch (1"). All taps shall have a minimum of three feet (3') separation.
Services shall be equipped with corporation stop, curb stop, and buffalo box. No joints shall be allowed between the corporation stop and curb stop, or between the curb stop and the meter unless otherwise approved by the City Engineer or Director of Public Works. Curb stops shall be at a five foot six inch (5'6") depth of bury. Curb boxes and buffalo box shall be set in the parkway on the center line of the property approximately centered between the back of the sidewalk and the adjacent Right of Way line (see Exhibit III-C-6). Except as permitted below, the underground water service pipe and the building sewer shall be not less than ten feet (10') apart horizontally and shall be separated by undisturbed or compacted earth. The curb stop shall have a concrete block placed under it for support.
Curb stops shall be Minneapolis pattern with flared connections conforming to ANSI/AWWA C800 and shall be the following brands or approved equal:
- A.Y. McDonald 6104
- Ford B22-444M
- Mueller H-15151
Curb boxes shall be 5'6" bury Minneapolis pattern with minimum 1-1/4" upper section equal to:
- A.Y. McDonald 5614
- Ford EM-55-56
(Curb Box Brands: Mueller, Star Pipe Products, Sigma/Nappco, Bingham & Taylor or approved equal)
Domestic water services and the fire sprinkler services must each have a separate connection to the watermain, service line, curb valve shut off and curb valve shut off box. There shall be a minimum of 3 ft. separation maintained between each service. The domestic service may not be tapped off of the fire sprinkler service, a fire hydrant line, or a dead end main.
The installation of the water service shall meet the latest version of “Standard Specifications for Sewer and Water Construction in Illinois” and governing plumbing codes. The water service pipe may be placed in the same trench with the building drain or building sewer if the conditions listed below are met:
- The bottom of the water service pipe at all points shall be at least eighteen inches (18") above the top of the sewer line at its highest point.
- The water service pipe shall be placed on a solid shelf excavated at one (1) side of the common trench (see Exhibit III-C-2).
All water services shall be installed with a minimum of five foot six inches (5'6") of cover from finished grade.
The City of Aurora Water & Sewer Maintenance Division shall make all taps including both domestic and fire service connections and water main pressure connections on main lines. Pressure connections are not allowed for same size pipes. The contractor shall pay the City at the current rate per tap prior to installation by contacting the Water Administration Division prior to scheduling the tap with the Water and Sewer Maintenance Division. The contractor shall provide, install, and seal test the appropriate fittings, valves, and structures for pressure connections prior to scheduling taps with the City of Aurora Water & Sewer Maintenance Division. The contractor shall provide and install appropriate saddles for service connections prior to scheduling taps. The City shall provide and install the corporation stop for the service connection.
When made on Cast Iron Pipe or Asbestos Cement Pipe, contractor shall provide and install an epoxy/nylon body service saddle equal to Cascade model CNS2. When made on PVC pipe contractor shall provide and install a stainless steel service saddle equal to Cascade model CSC2 (Saddle Brands: CNS2 = Ford C202, Smith-Blair 317, JCM 406. CSC2 = Ford FS303, Smith-Blair 372). One inch (1") taps made on Ductile Iron Pipe shall be direct and shall not require saddles. Two inch (2") taps will require a saddle equal to above specification. After the tap has been made and where the polyethylene wrap was opened, the polywrap shall be properly repaired with duct tape to reseal the opening.
All pressure connections shall be enclosed in a concrete vault. The vault size shall be based on the valve size. Three inch (3") taps and greater shall be made through a resilient wedge tapping valve and a tapping sleeve.
Pressure connections are not allowed when the pipe to be tapped and the new pipe are the same size. For this type of situation, a tee must be used.
Tapping sleeves shall be Cascade CST-EX, Ford FTSS, JCM 422, or Powerseal 3490 heavy duty all stainless steel style conforming to MSS-SP112, or cast iron mechanical joint style conforming to MSS-SP111. Stainless steel sleeves shall be constructed entirely of T-304 stainless steel including flange, fasteners, and test plugs. All sleeves shall be equipped with 3/4" test plugs to allow seal testing prior to tapping. Contractor shall install and seal test sleeves and valves prior to scheduling taps with the Water & Sewer Maintenance Division, City of Aurora. Seal test shall be at 100 psi air pressure or 150 psi hydrostatic pressure for duration of 3 minutes with no leaks. (Cast Iron Sleeve Brands: Waterous/AFC, Clow, Mueller or approved equal)
Tapping valves shall conform to ANSI/AWWA C-515 and shall have one flange connection with raised seat ring conforming to MSS-SP60 and one mechanical joint connection. (Tapping Valve Brands: Clow, Waterous, Mueller, Kennedy, U.S. Pipe & Foundry or approved equal)
All trenches caused by the construction of sewers, water mains, water service pipes, and the excavation around catch basins, manholes, inlets and other appurtenances which occur within the limits of existing or proposed pavements, sidewalks and curb and gutters, or where the edge of the trench shall be within two feet (2') of said improvements shall be backfilled with compacted granular backfill as detailed in Exhibit III-A-1 and Exhibit III-C-1 herein.
Granular backfill shall consist of CA-6 crushed limestone, CA-6 crushed gravel, or open graded material and shall be compacted in place to ninety-five percent (95%) of maximum density at optimum moisture as determined by the Modified Standard Proctor Test.
All manholes, catch basins, and inlets shall be reinforced precast concrete and shall be sealed with Butyl rope joint sealant. Manholes for both sanitary and storm sewers shall be spaced at a maximum interval of four hundred feet (400'). All manholes should be placed by property lines whenever possible.
All storm water from paved areas must pass through a catch basin prior to entering the storm sewer trunk line. All storm water will also be required to pass through a catch basin prior to entering a detention/retention pond. Inlets with a diameter of 2' will not be allowed if more than one pipe twelve inch (12") diameter or larger are entering or exiting the inlet. All catch basins and inlets shall be constructed with weep holes as detailed in Exhibit III-A-4 and III-A-5 respectively. All catch basins and inlets will be backfilled with CA-7 crushed limestone or crushed gravel to allow for subgrade seepage. If subgrade conditions are excessively wet, excessively sensitive to moisture or special conditions exist, a capped perforated pipe stubbed from the structure may be required.
Catch basins shall empty into a manhole except that a catch basin may tie directly into the storm sewer trunk line utilizing a concrete collar (6" minimum) if the following conditions are met:
- The storm sewer trunk line is thirty-six inch (36") diameter or greater.
- The storm sewer conduit from the catch basin to the trunk line is forty feet (40') or less, in length and enters the trunk line in the top one-third (1/3) of the storm sewer trunk line.
Jogs in sewer lines to pick up structures will not be allowed.
All final adjustments of castings will be accomplished by the use of concrete adjusting rings set in Butyl rope joint sealant; mortar joints will not be allowed. Height of adjusting rings shall not exceed eight inches (8") and the minimum adjusting ring thickness shall be two inches (2"). Frames set in concrete are not permitted. Metal or plastic shims will be used for fine adjustments of frames.
All manholes shall be marked at the time of construction with a 4" x 4" hardwood post neatly installed vertically with a minimum three foot (3') bury and a minimum four foot (4') exposed. The top one foot (1') of the post shall be neatly painted green for sewers.
All main line valve boxes, valve vaults, and buffalo boxes shall be marked at the time of construction with a 4" x 4" hardwood post neatly installed vertically with a minimum three feet (3') bury and a minimum four feet (4') exposed. The top one foot (1') of the post shall be neatly painted blue.
Public utilities, which are outside of the project limits (off-site), shall be permanently located with clearly labeled, PVC markers subject to the approval of the City Engineer and the Superintendent of Water and Sewer Maintenance Department. The post marker shall be Flexstake EZ Drive as manufactured by RoDon Corporation or approved equal. The post is an all-weather, color impregnated, UV stabilized specially formulated polymer extrusion and the Drive clamp is mild steel. The height shall be four feet (4') above ground, 3.25" wide. The marker installation requirement and location shall be determined on case-by-case basis.
All valves and buffalo boxes shall be located on the as-built plans with respect to the nearest fire hydrant.
All sanitary services shall be located on the as-built plans. Both the wye location and stub location shall be located with respect to the upstream manhole.