A. Design:
1. Design Criteria:
a. All design criteria shall be in general conformance with this section and section 12-5-7 of this chapter, the current Illinois environmental protection agency (IEPA) regulations, the IEPA technical policy statements, and the recommended standards for waterworks, latest edition.
b. Design and construction of water mains shall be in accordance with this section and section 12-5-7 of this chapter (including subsection A1a of this section), and if not stated therein, the requirements of the "Standard Specifications For Water And Sewer Main Construction In Illinois", latest edition. Where and if the provisions of these standards conflict, the stricter of the regulations shall apply.
2. Water Mains:
a. Water main sizes shall depend upon factors such as the demand requirements, the pressure requirements in the distribution system, and plans for the expansion of the municipal system. All water mains located within the distribution system shall be a minimum of eight inches (8") in diameter.
b. The layout of the water mains shall be as needed to serve adequately all lots and tracts with connection to the municipal system. The mains shall be looped and valved to permit shutting off of service to only a small number of connections for repairs or maintenance. Preferably, disruption of service should be limited to one block. Looped mains shall be provided in all locations except cul-de-sacs or scattered properties. The design and construction shall include the placement of all fittings, including tees, crosses, etc., where future development or engineering studies indicate looping will be required.
c. Unlooped mains or dead ends shall be equipped with a fire hydrant or permanent blowoff for flushing. See section 12-7-6 of this title.
d. All water mains shall be designed for a normal working pressure during average flow and use conditions of not less than fifty (50) psi, and a minimum pressure of twenty (20) psi under maximum flow conditions.
3. Hydrants:
a. Fire hydrants shall be installed throughout the entire distribution system. At least one hydrant shall be installed at each street intersection. The hydrant spacing shall provide for hose lines along right of way lines not exceeding three hundred fifty feet (350') to any portion of a lot or a five hundred foot (500') interval between hydrants along the street. Fire hydrants shall also be placed at all high spots in the distribution system.
b. All fire hydrants shall consist of Mueller® 3-way modern centurion type hydrants.
c. All fire hydrants shall be equipped with an auxiliary valve located between the main and the hydrant. See section 12-7-6 of this title.
d. All hydrant leads shall be a minimum six inch (6") diameter.
e. All hydrants shall have two (2) 21/2-inch hose connections, and one 41/2-inch pumper connection.
4. Plugs, Caps, Tees, Bends And Fittings:
a. All plugs, caps, tees, bends, and fittings deflecting eleven and one-fourth degrees (111/4°) or more on water mains shall be provided with both thrust blocking and restrained joints.
b. The thrust blocking shall be concrete mix having a compressive strength of not less than three thousand (3,000) psi at twenty eight (28) days. Thrust blocking shall be precast and placed between solid ground and the fitting to be anchored. The area of bearing on the pipe and on the ground in each instance shall be shown on the drawings. Thrust blocking shall be designed for a minimum internal pipe pressure of one hundred (100) psi. The blocking shall be kept clear of the entire bell configuration of any adjacent joint and shall be at least as large as is necessary to restrain the fittings from movement.
c. In addition to thrust blocking, restrained or tied joints shall be used when required per this section. The restrained joints shall be installed on both sides of the particular fitting and on the next two (2) pipe joints in either direction from the fitting. The number of restrained joints required upstream and downstream from a fitting shall be per the restraining device's manufacturer's recommendations and per the calculations of the subdivider's engineer.
5. Valves:
a. Valves shall be uniformly located in some standard area such as street or curb line to facilitate their location. A valve box, with its cover at the finished grade, shall always be placed over a buried valve. Valves should be located on all branches from feeder mains and between distributors and fire hydrants. A minimum of four (4) valves shall be provided at crosses and three (3) valves at tees; the valves should be placed on the smaller lines at each cross or tee.
b. Valves shall be spaced not more than five hundred feet (500') apart in commercial and industrial areas and eight hundred feet (800') in all other areas.
c. At the outer limits of the subdivision, valves at tees and crosses shall be placed so as to require the least number of water main shutdowns that would be needed when the mains for future subdivisions are extended. Water mains shall be extended to the outer boundary of the subdivision to facilitate future extensions.
6. Service Connection: A service connection shall be extended to each lot. All service connections shall be supplied with corporation stops and curb stops with box. The service pipe shall conform with the village rules and regulations for water service. Water service lines shall be installed by the developer from the water main to the property line and shall terminate at a curb stop. The individual homeowner is responsible for the installation of the water service from the curb stop to the home. The village is responsible for furnishing and installing only the individual water meters. See title 9 of this code.
7. Minimum Cover: Minimum cover for water mains and services shall be four feet six inches (4'6").
B. Materials:
1. Specifications Generally: All materials shall conform to the latest standards issued by the American Water Works Association and shall be NSF rated for potable water.
2. Water Mains: Water main pipe shall be polyvinyl chloride pipe, unless directed otherwise by the village superintendent of public works, described as follows:
a. Plastic water main pipe shall be SDR-PR pressure rated PVC pipe with single gasket joints. The pressure rating shall be SDR-21. The PVC pipe shall generally conform to ASTM standard D-2241. The joints shall be push on compression joints with rubber gaskets generally conforming to ASTM standards D-3139 and F-477. The joint shall have a built in stop to maintain proper pipe end separation to allow for thermal expansion and contraction.
b. If permission is granted by the village public works superintendent, ductile iron water main pipe may be used in lieu of PVC. Ductile iron water main pipe shall be standard pressure class 350 ductile iron pipe, with push on joints and cement lining, as described and manufactured in accordance with AWWA standards C150 and C151. Gaskets must properly match bell configuration. Rubber gasket joints shall be in accordance with AWWA standard C111. The pipe shall be cement lined per AWWA standard C104.
3. Pipe Fittings:
a. Fittings used with ductile iron pipe shall be pressure class three hundred fifty (350) psi ductile iron fittings, with push on joints and cement lining, as described and manufactured in accordance with AWWA standards C110 or C153 and C111. Mechanical joint end connections and retainer glands may be required where site conditions require joint restraint. Tapped and solid plugs shall have set screws for securing plug in bell of pipe or fittings.
b. Fittings used with PVC SDR-21 plastic pipe shall be ductile iron fittings, as described in subsection B3a of this section, with transition gaskets to fit the smaller outside diameter PVC pipe.
4. Valves And Valve Boxes:
a. Gate valves shall be either resilient wedge type gate valves or double disc type gate valves described as follows:
(1) Resilient wedge type gate valves shall be iron body resilient-seat gate valves manufactured in accordance with AWWA standard C509. End connections shall be mechanical joint or push on joint as necessary to meet the abutting pipe or fitting. The operating nut shall be two inches (2") square. An arrow showing the direction in which the valve opens shall be cut in the operating nut. Valves shall open counterclockwise. These valves shall be of the nonrising stem type. All internal parts shall be accessible without removing the main body from the pressure line. Valve body and bonnet shall be manufactured of cast iron and shall have a fusion bonded epoxy coating inside and out. Valve shall have a manganese bronze stem and "O" ring stem seals. Gates shall be a wedge shape design. Wedges shall be constructed of ductile iron, fully encapsulated in synthetic rubber except for the guide and wedge nut areas. Wedge rubber shall be molded and bonded to the ductile iron portion and shall not be mechanically attached with screws or similar fasteners. Wedges shall seat symmetrically about the centerline of the operating stem, so that seating is equally effective regardless of direction of pressure unbalance across the wedge. The waterway shall be full size, smooth, and have no depressions or cavities in the seat area.
(2) Double disc type gate valves, three inch (3") through forty eight inch (48") diameter, shall conform to the requirements of AWWA standard C500. The gate valves shall be double disc, parallel seat valves. All valves shall be of the nonrising stem type unless otherwise shown on the drawings. The valve stem shall be made of bronze, and the screw threads shall be accurately cut and worked smooth and true throughout the entire lift. The valve stem shall have a two inch (2") square opening nut. An arrow showing the direction in which the valve opens shall be cut on the opening nut. Valves shall open counterclockwise. Gate valves in exposed locations shall be fitted with appropriate hand wheels unless otherwise specified.
b. Valve boxes shall be adjustable, screw type, and made of best quality cast iron. Valve boxes for four inch (4") through twelve inch (12") gate valves shall have a minimum five and one-fourth inch (51/4") diameter shaft and consist of a base, bottom section, top section and a lid. Minimum thickness of metal shall be three-sixteenths inch (3/16"). Boxes shall be installed over the outside of all gate valves and shall be of length that can be adapted, without full extension, to depth of cover required. The word "water" shall be cast in the cover. A plastic centering insert shall be provided.
c. Blowoff valve assembly shall have materials as specified in typical blowoff valve assembly sketch found in section 12-7-6 of this title.
5. Hydrants:
a. Fire hydrants shall generally conform to the requirements of AWWA standard C502. These hydrants shall be the two (2) piece breakaway type. Hydrants shall be equipped with two (2) 21/2-inch hose nozzles and one 41/2-inch pumper nozzle. Outlets shall have national standard threads. The hydrant's main valve shall open with water main pressure and have a minimum opening of five and one-fourth inches (51/4"). Inlet connections shall be as shown on the drawings. Inlet to hydrant shall be at a minimum depth of four feet six inches (4'6"), measured from the existing ground surface to the top of the barrel of the pipe. Hydrants shall be Mueller® 3-way modern centurion type hydrants or equivalent, as authorized by the village public works superintendent. Anchoring pipe and couplings shall be used to install each hydrant.
b. Rock for hydrant drains shall be coarse aggregate, gradation CA-1 or CA-3, complying with the provisions of the "Standard Specifications For Road And Bridge Construction", IDOT.
6. Service Lines:
a. Service lines larger than one inch (1") in diameter shall be sized in accordance with the Illinois state plumbing code. All residential service lines shall be K-1 copper water tubing minimum one inch (1") diameter. Copper water tubing shall be type K, soft temper for underground service, conforming to ASTM standards B-88 and B-251. The pipe shall be marked with the manufacturer's name or trademark and a mark indicative of the type of pipe. The outside diameter of the pipe and minimum weight per foot of the pipe shall not be less than that listed in ASTM standard B-251, table 2.
b. All taps for water services in plastic water mains shall be made using bronze, two (2) section service clamps, designed for use with plastic pipe.
c. All corporation stops for one inch (1") diameter services shall be ground key corporation stops with a straight through design. Fabricated of brass, the inlet shall be AWWA taper thread, and the outlet shall be a compression connection for CTS O.D. tubing, Mueller model H-15008 or equivalent.
d. All curb stops for one inch (1") diameter services shall be Mueller oriseal III model H-1504-2 or equivalent. These stops shall have top and port "O" rings for sealing, have a quarter turn check, and have compression connections for CTS O.D. tubing on both ends. The stops shall be quarter turn, with an integral foot piece. Each curb stop shall be set on a concrete pad, approximately twelve inches by twelve inches by two inches (12" x 12" x 2") thick.
e. Curb boxes shall be placed over all curb stops. They shall be cast iron extension type boxes with threaded screw on pattern base, designed to fit over the specified curb stop. The boxes shall be one inch (1") or one and one-fourth inch (11/4") diameter, generally forty eight inches (48") in length when fully retracted, and sixty inches (60") in length when fully extended. Boxes shall be furnished with a combination cast iron lid and a pentagon plug.
C. Construction:
2. All types of pipe shall be handled in such manner as will prevent damage to the pipe or coating. The pipe and fitting shall be inspected by the subdivider for defects while suspended above grade. Accidental damage to pipe or coating shall be repaired to the satisfaction of the developer's engineer or be removed from the job. Methods of handling shall be corrected to prevent further damage when called to the attention of the subdivider.
3. Dirt or other foreign material shall be prevented from entering the pipe or pipe joint during handling or laying operations, and any pipe or fitting that has been installed with dirt or foreign material in it shall be removed, cleaned and relaid. At times when pipe laying is not in progress, the open ends of the pipe shall be closed by a watertight plug or by other means authorized by the developer's engineer to ensure absolute cleanliness inside the pipe. Threaded pipe ends shall be protected by couplings or other means until laid.
4. The water mains shall be laid and maintained to lines and grades established by the drawings and specifications, with fittings, valves, tapped or bossed outlets, and hydrants at the required locations. Valve operating stems shall be oriented in a manner to allow proper operation. Hydrants shall be installed plumb.
5. All water mains shall be laid to a minimum cover depth of four feet six inches (4'6"). Depth shall be varied as necessary to accommodate crossings with other utilities. Record depth measurements shall be taken at intervals not greater than one hundred feet (100') to verify installed depth. Depth shall be determined to proposed finished grade.
6. Record horizontal or vertical locations of all water mains shall be provided at intervals not greater than two hundred fifty feet (250') to verify installed location. Long radius curves, either horizontal or vertical, may be laid with standard pipe by deflections at the joints for most rigid pipes and in the pipe for most flexible pipes. If shorter lengths are required, the drawings will indicate maximum lengths that can be used.
7. Where field conditions require deflection of curves not anticipated by the drawings, the developer's engineer will determine the methods to be used. Maximum deflections at pipe joints and laying radius for the various pipe lengths shall be as recommended by the pipe manufacturer or stated in applicable AWWA standards. When rubber gasketing pipe is laid on a curve, the pipe shall be jointed in a straight alignment and then deflected to the curved alignment. Trenches shall be made wider on curves for this purpose.
8. The trench bottom shall be true and even to provide support for the full length of the pipe barrel. The pipe shall be bedded in a minimum of four inches (4") of pipe bedding. Holes for the bells shall be provided at each joint, but shall be no larger than necessary to allow joint assembly and to ensure that the pipe barrel will lie flat on the trench bottom. Pipe shall be installed in accordance with AWWA standard C600.
9. Maximum joint deflection angle for any water main shall be three degrees (3°).
10. All water mains shall be constructed in accordance with the water and sewer separation requirements stated in section 12-5-7 of this chapter.
11. A valve box shall be provided for every valve. The valve box shall not transmit shock or stress to the valve. The valve box shall be centered over the operating nut of the valve, with the box cover flush with the finished surface. Valve boxes shall be set true vertically and supported to remain so until all backfill has been placed.
12. All hydrants shall stand plumb and shall have their hose nozzles parallel with the length of the street, with pumper nozzle four and one-half inches (41/2") facing the street. Hydrants shall be set with the bottom flange of the top section two inches (2") above ultimate final grade of the ground, with a maximum deviation of two inches (2") in elevation being allowed. Each hydrant shall be connected to the main with a six inch (6") or larger diameter branch controlled by an independent valve. The valve shall be restrained to allow shutoff when the hydrant is to be removed. All hydrants and hydrant leads shall have restrained joints from the main to the hydrant including the connection to the main and the hydrant foot.
13. Drainage shall be provided at the base of the hydrant by placing coarse gravel from the bottom of the trench to at least six inches (6") above the waste opening in the hydrant and to a distance of one foot (1') around the elbow. The surface of the coarse gravel shall be covered with geotextile filter fabric to prevent soil intrusion into the stone. Adequate support must be provided to prevent the fire hydrant from settling. The bowl of each hydrant shall be well braced against a sufficient area of unexcavated earth at the end of the trench with concrete thrust blocks.
14. New water mains and appurtenances shall be connected to the existing piping in accordance with the details in section 12-7-6 of this title. If the existing piping can be isolated from the system, the connections shall be made by using cutting in sleeves in the existing piping. If the existing water mains cannot be isolated from the system, the connections shall be made under pressure using tapping sleeves and tapping valves.
15. Where the connection of a new water main or appurtenance requires interruption of service and notification of customers affected, the village public works superintendent and subdivider shall mutually agree upon a date and time for the connections to be made. The date and time will allow ample time for the subdivider to assemble the labor and materials and for the village to notify all customers affected.
D. Testing:
1. Pressure Test:
a. The subdivider shall be responsible for and pay all costs associated with testing pressure mains. After a section of pipe has been laid and partly backfilled, all newly laid pipe or any valved sections of it shall be subjected to a hydrostatic pressure equal to fifty percent (50%) more than the operating pressure at the lowest elevation of the pipe section, but not to exceed the pressure rating of the type of pipe specified or the thrust restraint design pressure. The test pressure shall not vary by more than five (5) psi for the duration of the test. Each pressure test shall be not less than one hour, and the contractor shall allow the system to stabilize at the test pressure before conducting a leakage test. The basic provisions of AWWA standard C600, "Installation Of Ductile Iron Water Mains And Their Appurtenances", shall apply.
b. Each section of pipe to be tested (at no more than 1,000 foot intervals), as determined by the developer's engineer, shall be slowly filled with water, and the specified test pressure shall be applied by means of a pump connected to the pipe in a satisfactory manner. The pump, pipe connection, and all necessary apparatus, including gauges and meters, shall be furnished by the contractor. Before applying the specified test pressure, all air shall be expelled from the pipe and valves. When hydrants are in the test section, the test shall be made against closed hydrant valves. To accomplish this, taps shall be made, if necessary, at points of highest elevation and afterwards, tightly plugged. Any damaged or defective pipes, fittings, valves, or hydrants discovered in consequence of this pressure test shall be removed and replaced by the subdivider, and the test shall be repeated until satisfactory to the village engineer.
c. The developer's engineer and a representative from the village shall witness each test. The developer's engineer shall record the results of each test, state whether the results were satisfactory or not, and have all who witnessed the test sign these reports.
2. Leakage Test:
a. During the pressure test, a leakage test shall be conducted to determine the quantity of water lost by leakage under the specified test pressure. The subdivider shall be responsible for and pay all costs associated with leakage testing. "Leakage" shall be defined as the quantity of water that must be supplied into newly laid pipe or any valved section thereof to maintain pressure within five (5) psi of the test pressure after the pipe has been filled with water and the air has been expelled. Leakage shall not be measured by a drop in pressure in a test section over a period of time. Duration of each leakage test shall be a minimum of one hour in addition to the pressure test period.
b. The maximum allowable leakage in gallons per hour for a pipeline shall not exceed that amount determined by the following formula:
L = (N x D x square root of P)/7,400
Where: | ||
L | = | Allowable leakage in gallons per hour |
N | = | Number of joints in the length of pipeline tested |
D | = | Nominal diameter of the pipe in inches |
P | = | Average test pressure during leakage test, in psig |
When testing against closed metal seated valves, an additional leakage per closed valve of 0.0078 gph/inch of nominal valve size shall be allowed.
c. Acceptance of a section of water main shall be determined on the basis of allowable leakage. If any test of laid pipe discloses leakage greater than that specified above, the subdivider shall locate and make repairs as necessary until the leakage is within the specified allowance.
d. The developer's engineer and a representative of the village shall witness these tests. The developer's engineer shall record the results of these tests, state whether the results were satisfactory or not, and have all who witnessed the test sign these reports.
3. Disinfection Of Water Mains:
a. Disinfection of all potable water mains shall be conducted in general accordance with "Disinfecting Water Mains", AWWA standard C651, and 35 Illinois administrative code 652.203. The subdivider shall be responsible for and pay all costs associated with water main disinfection. Only one sample shall be required for the disinfection test. However, failure to demonstrate satisfactory disinfection shall oblige the developer to submit two (2) consecutive water samples collected from the completed project at least twenty four (24) hours apart. Satisfactory disinfection is demonstrated when the sample indicates no bacterial growths as measured by the membrane filter technique or no tubes positive as measured by the presumptive test, fermentation tube method.
b. All new water mains shall be satisfactorily disinfected prior to use. All new community water supplies shall receive satisfactory results from the analyses before an operating permit will be issued.
c. Adequate chlorine residuals exist in a distribution system when there is a minimum of 0.2 milligrams per liter free chlorine residual for water supplies practicing free chlorination or 0.5 milligrams per liter combined chlorine residual for water supplies practicing combined chlorination. Projects in these supplies shall be considered satisfactorily disinfected if one water sample set indicates no bacteria.
d. Analyses of these samples shall be performed by an agency laboratory or another certified laboratory. The operating permit application shall be sent to the division of public water supplies permit section at the same time as the water samples are sent to the agency laboratory. The laboratory report sheets shall be submitted with the completed operating permit application if another certified laboratory is used. (Ord. 2007-19, 5-21-2007)