(A) General.
(1) All developments including subdivisions and planned unit developments whether public or private within the area of the city's jurisdiction as identified on the official map shall obtain potable/domestic water supply from a public water system and shall include provisions for the construction of water distribution facilities complete with valves, fire hydrants, and other appurtenances designed in accordance with this chapter and city details.
(2) As a minimum, the water distribution system shall provide a service connection or connections at the approximate mid-point from the property line of each individual lot or parcel within the development. Where more than one building is located or planned on one lot or parcel of property, or when water main construction is required on the property for fire protection, the proposed construction shall also include all water main construction and appurtenances within the lot or parcel except service lines. The proposed water distribution system extension shall extend to the far side of the development site.
(3) Specification references made herein for manufactured materials such as pipe, hydrants, valves and fittings refer to designation of the American Water Works Association (AWWA) or of the American National Standard Institute (ANSI). Water distribution systems shall be constructed in accordance with the “Standard Specifications for Water and Sewer Main Construction in Illinois,” latest edition, unless otherwise modified in this section.
(B) Design standards.
(1) System extensions.
(a) Extensions to the water distribution system shall form a complete network extension or a part of a complete network extension including all primary mains, secondary mains, and gridiron mains, complementing the existing distribution system network.
(b) Primary mains are those mains forming the arterial portion of the system and in the case of construction within a subdivision are further defined as mains 12 inches or larger. Primary mains within or adjacent to a subdivision shall be sized and located in accordance with the future water supply and water system infrastructure growth plan at the direction of the Director of Public Works and Engineering. Secondary mains shall be sized, looped, and spaced as required for fire flows and shall have a minimum diameter of eight inches.
(c) Gridiron mains shall form a grid to supply water to the local fire hydrants and service lines. Gridiron mains shall have a minimum diameter of eight inches.
(d) The proposed system extension shall be arranged so that the service interruption caused by a break in any main will be limited to 32 residential units or 500 feet in all non-residential areas.
(e) All lots or buildings must have a water service from a looped water main.
(2) Estimated water demand. For purposes of water main design, maximum daily water consumption for water main design shall be based on the following table:
Type of Establishment | Unit | Maximum Consumption in Gal/Day/Unit* |
Type of Establishment | Unit | Maximum Consumption in Gal/Day/Unit* |
Shopping Centers | Employee (1 shift) | 105 |
Stores | Employee (1 shift) | 65 |
Offices | Person (1 shift) | 50 |
Industrial Buildings | Person (1 shift) | 75 |
Restaurants | Meal Served | 15 |
Theaters | Seat | 10 |
Hotels | Guests | 210 |
* Quantities are exclusive of process water requirements, which must be estimated and added. For other than residential subdivisions, when the details of the subdivision are not known, maximum daily consumption and fire flow may be estimated by the Director of Public Works and Engineering or authorized designee. Such estimate shall not relieve the owner or developer of the responsibility of providing adequate main capacity for any and all future needs within his subdivision. In such cases, the minimum main size shall be 12 inches. | ||
(3) Head loss. Head losses related to velocity in water mains shall be computed using the Hazen-Williams formula:
V = 1.318(C)(R)0.63(S)0.54
Where:
V = velocity in units of feet per second
R = Hydraulic radius in units of feet
S = Hydraulic gradient in units of feet per foot
(4) Required capacity. Primary mains, secondary mains, and gridiron mains shall be sized to provide sufficient capacity to deliver the required fire flow plus the consumption at the maximum daily rate to all areas served by the proposed construction.
(5) Required fire flow and pressure. A separate fire flow report shall be prepared that indicates that at selected locations, and at any other locations, and at any other location that may be selected by the Director of Public Works and Engineering or authorized designee, the fire flows required, in excess of maximum daily consumptive demands, using a “C” factor of 100, ignoring fittings, and with a minimum residual hydrant pressure of 20 psi, will be supplied. Required fire flow shall be computed as detailed in the “Guide for Determination of Required Fire Flow,” as provided within the fire suppression rating schedule, latest edition, published by the Insurance Service Office.
(6) Fire hydrant spacing.
(a) Fire hydrants shall be installed so that the near corner of all construction on the site that could burn, will not be further than 150 feet from a fire hydrant. Fire hydrants shall be provided so as to provide the required fire flows to structures as described in the “Fire Suppression Rating Schedule,” latest edition. Six inch main extensions serving hydrants shall not be more than 150 feet long.
(b) Fire hydrants shall be placed on private property, under the direction of the Fire Chief, when he determines that fire hydrants in the public right-of-way are at too great a distance to provide proper protection for multi-family, commercial or industrial structures.
(c) A fire hydrant shall be placed within 100 feet of all sprinkler and/or standpipe Siamese connections on buildings, unless otherwise directed by the Fire Chief.
(7) Valve spacing. A sufficient number of valves shall be provided so that a break or other failure will not affect more than 32 residential units or 500 feet of main in nonresidential areas.
(C) Materials specifications and details. All water distribution system elements shall conform to the following specifications:
(1) Ductile iron pipe.
(a) Pipe class thickness. ANSI A21.50 (AWWA C150), minimum thickness Class 52, unless otherwise approved by the Director of Public Works and Engineering or authorized designee.
(b) Pipe. ANSI A21.51 (AWWA C151).
(c) Pipe lining. ANSI A21.4 (AWWA C104).
(d) Fittings. ANSI 21.10 (AWWA C110).
(e) Joints. Mechanical and push-on, ANSI A21.11 AWWA C111.
(2) Polyethylene encasement. To protect ductile iron pipe from corrosion, all ductile iron water mains shall be encased with an eight-mil thick polyethylene sleeve in accordance with ANSI/AWWA C1O5/A21.5 standards.
(3) Valves.
(a) Twelve inch and smaller - iron body, bronze mounted, double disc, parallel seat, non-rising stem gate valves, counter clockwise to open, AWWA C515.
(b) Fourteen inch and larger - iron body, rubber seat, butterfly valve, Class 150B, counter clockwise to open, AWWA C504.
(c) Joint end - mechanical, AWWA C111.
(4) Fire hydrants.
(a) In accordance with the City of Lockport standard drawings.
(b) Dry barrel, AWWA C502, painted bright red above ground, with auxiliary gate valve.
(c) Valve size, 5.25 inch, counter clockwise to open.
(d) Nozzles, two at 2.5 inch, one at 4.5 inch, with threads conforming to National Standard Specifications.
(e) Frangible section (breakaway type) with the break line flange located one inch above finished grade.
(f) Mechanical joint end, six inch.
(g) Provided with a STORZ quick connection adapter.
(5) Fire hydrant valve boxes.
(a) In accordance with the City of Lockport Standard Drawings.
(b) Lid embossed “WATER.”
(6) Air release valves. In accordance with the City of Lockport standard drawings.
(7) Corporation stops. In accordance with the City of Lockport Standard Drawings and AWWA C800.
(8) Water service pipe.
(a) Two inch and smaller: copper tube, ASTM B88, Type K, one and 1.5 inch minimum, in accordance with the City of Lockport standard drawings.
(b) Larger than two inch: ductile iron per (C)(1) above.
(9) Curb stops.
(a) In accordance with the City of Lockport standard drawings.
(b) Copper service: compression copper connections, minimum one inch, tee head checks, 90 degree turn only.
(10) Curb box.
(a) In accordance with the City of Lockport standard drawings.
(11) Concrete thrust restraints.
(a) Horizontal reactions - thrust restraints at all tees, plugged ends, hydrants, and bends of 11.75 degrees to 90 degrees shall conform to the details in the standard specifications for water and sewer main construction in Illinois.
(b) Vertical reactions - the applicant shall submit individual designs for each location to the Director of Public Works and Engineering or authorized designee and comply with AWWA C600, Section 3.8.
(c) Material: precast or poured Portland cement concrete, IDOT Class SI plus “Megalug” retainer glands.
(d) Where undisturbed earth is not available or not likely to be available to support concrete thrust blocks under pressure, the applicant shall specify tie rods with or without anchor type concrete thrust blocks and submit the design data to the Director of Public Works and Engineering or authorized designee. Care shall be taken when placing concrete so that it will not interfere with access to joints or with hydrant drainage.
(12) Casing pipes/carrier pipes.
(a) In accordance with the City of Lockport standard drawings.
(b) Steel carrier pipe: ASTM A120, 3/8" minimum thickness
(c) PVC carrier pipe: AWWA C900, minimum thickness equal to SDR 26, push-on type joints.
(13) Valve vaults.
(a) In accordance with the City of Lockport standard drawings.
(b) Materials. Precast reinforced concrete sections - ASTM C478 and ASTM C443.
(c) Size. For six inch and eight inch diameter valves, valve vaults shall have a 48 inch inside diameter; for pressure connections and valves ten inch and larger in diameter, valve vaults shall have a 60 inch inside diameter.
(d) Adjustment. No more than two precast concrete adjusting rings with six inch maximum height adjustment shall be allowed. Rubber adjusting rings instead of concrete adjusting rings are required for valve vaults located in pavement areas.
(e) Vault joints. All joints between the vault sections shall be sealed with mastic. McWrap or equal shall be used around the outside of the vault at all joints.
(f) Castings. Frame and cover shall be in accordance with the City of Lockport standard drawings. Steps shall be plastic on 16 inch centers, with the initial step located eight inches below the top of the structure.
(14) Granular pipe bedding. Pipe bedding shall be in accordance with the lockport standard drawings and Section 20 of the standard specifications for water and sewer main construction in Illinois. Material shall be crushed aggregate meeting IDOT CA-7 gradation.
(D) Installation requirements.
(1) The installation of water mains and appurtenances, including services, shall conform to the requirements of this chapter, Section 41 of the Standard Specifications for Water and Sewer Main Construction in Illinois, AWWA C600, and Lockport Standard Details.
(2) Environmental Protection Agency permit. Water system design and construction shall be in accordance with the regulations of the Illinois Environmental Protection Agency. No construction shall commence until a copy of a permit from this agency is filed with the Director of Public Works and Engineering or authorized designee.
(3) Excavation.
(a) The trench shall be excavated so that the water main will be at a minimum depth of five and 5.5 feet. The trench for the pipe shall be excavated at least two feet wider than the external diameter of the pipe but not wider than the widths denoted on the City of Lockport standard drawings.
(b) Bell holes of sufficient depth shall be provided across the bottom of the trench to accommodate the bell of the pipe, to provide sufficient room for joint making and to ensure uniform bearing for the pipe.
(c) Where a firm foundation cannot be found at the bottom of the trench, due to soft, spongy or other unsuitable soil, such unsuitable soil shall be removed for the full width of the trench or tunnel and replaced with well compacted unwashed gravel or an equal substitute, or crushed stone if such compacted material proves unsatisfactory. Where rock, in either ledge or boulder formation, is encountered, it shall be removed below grade and replaced with a well-compacted bed of unwashed gravel having a thickness under the pipe of not less than eight inches.
(4) Sheeting and bracing.
(a) Sheeting and bracing shall be used in the excavation area, as may be necessary for the safety of the work and the public, for the protection of the workmen and to prevent adjacent properties from damage.
(b) Sheeting shall not be removed until the backfill has been placed and thoroughly compacted.
(5) Laying water main.
(a) The contractor shall keep the trench free from water while the water main is being placed and until the pipe joint has been sealed to the satisfaction of the Director of Public Works and Engineering or authorized designee.
(b) Adequate provision shall be made for the safety, storage and protection of all water pipe prior to actual installation in the trench. Care shall be taken to prevent damage to the pipe castings, both inside and out. Provisions shall be made to keep the inside of the pipe clean throughout its storage period and to keep mud and/or other debris from being deposited therein. All pipe shall be thoroughly cleaned on the inside before laying of the pipe. Proper equipment shall be used for the safe handling, conveying and laying of the pipe. All pipe shall be carefully lowered into the trench, piece by piece, by means of a derrick, ropes, or other suitable tools or equipment, in such manner as to prevent damage to water main materials and protective coatings and linings. Under no circumstances shall water main materials be dropped or dumped into the trench.
(c) In making joints, all portions of the joining materials and the socket and spigot ends of the joining pipe shall be wiped clean of all foreign materials. The actual assembly of the jointing shall be in accordance with the manufacturer's installation instructions and/or as directed in writing by the Director of Public Works and Engineering or authorized designee. During construction, until jointing operations are complete, the open ends of all pipes shall be at all times protected and sealed with temporary watertight plugs.
(6) Pipe cutting.
(a) The cutting of pipe for inserting valves, fittings or closure pieces shall be done in a neat and workmanlike manner without damage to the cement lining and so as to leave a smooth end at right angles to the axis of the pipe.
(b) When machine-cutting is not available for cutting pipe 20 inches in diameter or larger, the electric-arc cutting method will be permitted, using a carbon or steel rod. Only qualified and experienced workmen shall perform this work.
(c) The flame-cutting of pipe by means of an oxyacetylene torch shall not be allowed.
(7) Trenches.
(a) The trench bottom shall be flat, and shall provide full bearing for the length of the pipe, with a minimum of six inches of crushed granular bedding.
(b) Trenches shall be jetted after backfilling if required by the Director of Public Works and Engineering.
(c) Thrust blocks shall be used to prevent movement at all bends, tees, caps, valves and hydrants.
(d) Backfilling the trench shall be accomplished by careful replacement of the excavated material after the pipe and the bedding material have been installed. Any trench excavated to within five feet of a pavement edge, sidewalk or curb and gutter shall be backfilled to the top of the trench with CA-7 granular material, in compliance with Section 20 of the Standard Specifications for Water and Sewer Main Construction in Illinois.
(8) Fire hydrants.
(a) Fire hydrants shall be placed as specified on the engineering plans. All hydrants shall stand plumb, with the pumper nozzle pointing to the road. They shall conform to the established grade, with nozzles at 18 inches above the finished ground.
(b) A drainage pit two feet in diameter and two feet deep shall be excavated below each hydrant and filled completely with crushed washed stone under and around the bowl of the hydrant and to a level six inches above the waste opening. Hydrant drainage pits shall not drain to a sewer.
(c) Hydrant leads and extensions shall be provided as needed in order to maintain adequate setback from the water main and to provide a three foot separation from the fire hydrant and the hydrant valve box, and to provide a minimum vertical distance of 18 inches from the center of the pumper nozzle to the final ground elevation.
(9) Water main installation. During water main installation, to make a closure between two pipe ends, or between pipe end fittings, or between pipe ends and valves, short lengths of water main pipe shall be used with proper connections or couplings. Repair sleeves shall not be used to make closures during new construction.
(10) Dewatering. Where ground water is encountered in the trench, it shall be removed during pipe-laying and jointing operations. Trench water shall not be allowed to enter the pipe at any time.
(11) Connections to existing mains. All connections to the city water distribution system shall be made under full water service pressure unless otherwise approved by the Director of Public Works and Engineering or authorized designee.
(E) Water services. A water service line is a water pipe connected at the water main by a brass corporation stop or a ductile iron fitting attached at a 45° angle per city details. Said pipe is extended horizontally at right angles with the water main to the front line of a lot or single building which it is to serve. The service pipe shall be provided with a brass curb stop or gate valve at a location between the curb and the sidewalk, not underneath the driveway apron, unless otherwise specified by the Director of Public Works and Engineering or authorized designee. A cast iron curb box shall be installed over curb stops or four inch and smaller gate valves. A valve vault shall be provided for gate valves larger than four inches. All water service lines shall be located at the approximate center of each lot at a minimum depth of five feet. Intermediate unions within the public right-of-way are not permitted. All underground fittings must be compression from the water main to the building unless otherwise specified by the Director of Public Works & Engineering.
(F) Fire protection services. All fire sprinklers shall be connected to the water system through a separate fire service line constructed in accordance with the requirements of this chapter.
(G) Water main separation requirements. Water mains and water service lines shall be protected from sanitary sewers, storm sewers, combined sewers, house sewer service connections and drains in accordance with Section 41 and Standard Drawings 19 through 24 of the Standard Specifications for Water and Sewer Main Construction in Illinois and all Illinois Environmental Protection Agency Requirements.
Where conditions exist that the minimum vertical separation cannot be attained, or if it is necessary for the water main to pass under a sewer or drain, one of the following two measures shall be taken:
(1) The water main shall be installed within a PVC carrier pipe and the carrier pipe shall extend on each side of the crossing until the normal distance from the water main to the sewer or drain line is at least ten feet.
(2) The involved sewer or drain shall be constructed from manhole to manhole with “O” ring pipe conforming to ASTM 361 or other pipe material which conforms to water main standards.
(H) Pressure testing.
(1) As part of the construction, the water mains shall be pressure tested in accordance with this chapter. The Contractor shall coordinate with city Water Department staff to fill and flush the new water main. Only City Water Department staff is authorized to operate existing water valves.
(2) All newly laid pipe shall be subjected to a hydrostatic pressure of 150 pounds per square inch. Duration of each pressure test shall be for a period of not less than two hours. Each valved section of pipe shall be filled with water and the specified test pressure shall be applied by means of a pump connected to the pipe.
(3) Before applying the specified test pressure, all air shall be expelled from the pipe. All leaks shall be repaired until tight. Any cracked or defective pipes, fittings, valves, or hydrants discovered in consequence of this pressure test shall be removed and replaced and the test repeated until satisfactory results are obtained.
(4) All testing shall be done after the installation of service lines. Suitable means shall be provided for determining the quantity of water lost by leakage under the specified test pressure. Leakage is defined as the quantity of water required to be supplied to the newly laid pipe necessary to maintain the specified test pressure. Allowable leakage shall not be greater than that computed as follows:
L = (N)(D)(P)/7,400
Where:
L = Allowable leakage in gallons per hour
N = Number of joints in the pipeline being tested
D = Nominal diameter of the pipe in inches
P = Average test pressure during the test in pounds per square inch
(I) Preliminary flushing, disinfection, and testing. Refer to the City of Lockport Standard Detail 60-7.
(J) All water valves shall be opened and closed as part of the final inspection to ensure that they can be operated using a standard key. Valves which are too deep to reach with a standard key shall be provided with permanent extensions securely anchored to the walls of the valve vault.
(Ord. 18-008, passed 2-7-18; Am. Ord. 21-021, passed 8-18-21)