Spec. Reference ODEQ Chapter 626.19.pdf

(2) Level controls. Provide adequate controls to maintain levels in distribution system storage structures.

(A) Control pumps by sensing tank water levels and transmitting the signal by telemetering equipment when any appreciable head loss occurs in the distribution system between the pump and the storage structure.

(B) Provide altitude valves or equivalent controls for a second and subsequent structures on the system based on the hydraulic profile.

(C) Provide overflow and low-level warnings or alarms.

(3) Inlet and outlet lines. Provide separate inlet and outlet lines for positive circulation of water in the tank. Terminate the inlet line at a minimum elevation of 30% or greater tank height to ensure adequate circulation in the tank. Locate the outlet line at least 18 inches above bottom of tank to prevent withdrawal of sediment.

SUBCHAPTER 19. DISTRIBUTION SYSTEM

Section

252:626-19-1. General

252:626-19-2. Installation of mains

252:626-19-3. Water main design for all systems providing fire protection

252:626-19-4. Water main design for systems providing domestic water only

252:626-19-1. General

(a) Pressure Requirements. Design the distribution system to provide a minimum of 25 psi throughout the distribution system under normal operating conditions including peak demand and fire flows where fire protection is provided.

(b) Hydraulic analysis. Submit a hydraulic analysis of the system that demonstrates:

(1) a minimum of 25 psi shall be maintained throughout the distribution system during peak demand, and

(2) that flows are calculated at not less than one (1) gallon per minute per service connection.

(c) Standards. All materials, including piping, fittings, valves, fire hydrants, gaskets, packing and other joint materials shall meet the latest specifications issued by the AWWA, ASTM, ANSI, NSF, or the federal government.

(d) Dead ends. Minimize dead ends by looping of all mains whenever practical. Where dead end mains occur, provide an approved flushing hydrant or blow-off for flushing purposes. Do not connect flushing devices directly to any sewer. A fire hydrant is an approved flushing device.

(e) Air relief and blow-off valves. Locate air relief valves at high points in lines where air can accumulate. Do not use automatic air-relief valves where flooding of the valve exhaust may occur. Locate sufficiently sized blow-offs at low points of large mains to effectively remove accumulated sediments. Extend the open end of the exhaust line from automatic valves to at least

1 foot above grade and terminate with a screened, downward-facing elbow. Do not connect air reliefs or blow-offs directly to any sewer.

(f) Enclosure drainage. Do not connect chambers, pits or manholes containing valves, blow-offs, meters or other appurtenances to a distribution system directly to any storm drain or sanitary sewer. Drain chambers or pits to the surface of the ground where they are not subject to flooding by surface water, or to underground absorption pits.

252:626-19-2. Installation of piping

(a) Standards. The standards in this Section apply to the installation of piping in public water supply distribution systems. Specifications must incorporate the provisions of the AWWA standards.

(b) Bedding. Provide continuous and uniform bedding in the trench for all buried pipe. Tamp backfill material in layers around the pipe and to a sufficient height above the pipe to adequately support and protect the pipe. Remove all stones found in the trench to a depth of at least 6 inches below the bottom of the pipe.

(c) Cover. Provide all water mains with at least 30 inches of cover or with sufficient insulation to prevent freezing.

(d) Blocking. Provide reaction blocking, tie rods, or joints designed to prevent movement at all tees, bends, plugs and hydrants to prevent movement of the pipe.

(e) Pressure and leakage testing. Test the installed pipe for leakage in accordance with

AWWA standard specifications. Leakage must not exceed 10 gal/inch diameter per mile of pipe per 24 hours at 150 psi testing pressure.

(f) Disinfection and testing. Disinfect all waterlines according to AWWA standard specifications. Obtain safe bacteriological samples on two consecutive days before placing the waterline into service.

(g) Permeation of system by organic compounds. Where distribution lines are installed in areas of soil or groundwater contamination by organic compounds use:

(1) pipe and joint materials that are not subject to permeation by organic compounds.

(2) non-permeable materials for all portions of the system including water mains, service connections, and hydrant leads.

(h) Separation of water mains and sewers from contamination sources.

(1) Horizontal separation.

(A) Measure the separation distance edge to edge.

(B) Locate water mains at least 10 feet horizontally from any existing or proposed sewer lines.

(C) Locate water mains at least 5 feet horizontally from any existing or proposed storm sewers, raw water lines, petroleum product lines, natural gas lines, and other buried utility lines.

(D) Locate cast iron waterlines at least 10 feet from any gasoline storage tank and lines and

PVC water lines at least 50 feet horizontally from any gasoline storage tank and lines.

(E) Locate waterlines at least 15 feet from all parts of septic tanks and absorption fields, or other sewage treatment and disposal systems.

(2) Vertical Separation.

(A) Measure the separation distance from edge to edge.

(B) Lay waterlines crossing sewer lines to provide a minimum vertical distance of 24 inches between the water main and the sewer line. Arrange the piping so that joints in a

20-foot length of PVC or 18-foot length of cast iron sewer pipe will be equidistant from the water main. Where a water main crosses under a sewer, provide adequate structural support for the sewer to prevent damage to the water main.

(C) Maintain a 2-foot vertical separation between waterlines and any existing or proposed storm sewers, raw water lines, petroleum product lines, natural gas lines, and other buried utility lines.

(3) Special conditions. When it is impossible to obtain proper horizontal and vertical separation as stipulated in (1) and (2) of this subsection, design and construct the other line equal to water pipe, and pressure test it to assure water tightness of joints adjacent to the water line prior to backfilling.

(i) Surface water crossings.

(1) Above-water crossings. Adequately support and anchor the pipe. Provide protection from damage and freezing. Make waterline accessible for repair or replacement.

(2) Underwater crossings. Provide a minimum cover of 2 feet over the pipe. For waterlines crossing a well defined channel bottom greater than 15 feet in width, construct the waterline as follows:

(A) design the pipe for river crossings and have flexible, restrained or welded watertight joints,

(B) provide valves at both ends of water crossings so that the section can be isolated for testing or repair. The valves must be easily accessible and not subject to flooding. The valve closest to the supply source must be in a manhole, and

(C) make permanent taps on each side of the valve within the manhole to allow insertion of a small meter for testing to determine leakage and for sampling purposes.

(j) Tracer wire. Install metal tracer wire on all non-ferrous piping used for public water supply mains.

252:626-19-3. Water main design for all systems providing fire protection

(a) Sizing of mains. Size all lines after a hydraulic analysis pursuant to the International Fire

Code, published by the International Code Council, Inc., 2003 Edition, Distribution System

Requirements for Fire Protection, M 31, published by the AWWA, 3 rd

Edition or other recommendations of similar organizations for the fire service area. The minimum main size is 6 inches in diameter.

(b) Hydrants.

(1) Fire hydrants must have a 4-1/2 inch pumper outlet and at least two 2-1/2 inch hose outlets.

(2) Fire hydrants shall only be connected to water systems and mains designed to carry fire-flows.

(3) Locate and space hydrants pursuant to the International Fire Code, published by the

International Code Council, Inc., 2003 Edition, Distribution System Requirements for Fire

Protection, M 31, published by the AWWA, 3 rd

Edition or other recommendations of similar organizations for the fire service area.

(4) The minimum hydrant lead size is 6 inches in diameter.

(5) Provide a shut-off valve to allow hydrant maintenance or replacement.

(6) The lowest outlet shall be installed no less than 18 inches above the surrounding grade and the operating nut higher than 4 feet above grade.

(7) Drains from fire hydrant barrels shall not be connected to sanitary sewers or storm drains.

(c) Valves. Install valves on all small distribution lines branching from larger mains. Locate positive closing valves for isolating a line so that a single break will:

(1) require no more than 500 feet of pipe be removed from service in high-service areas,

(2) require no more than 1,320 feet in other sections, and

(3) not require shutting down an artery.

252:626-19-4. Water main design for systems providing domestic water only This section applies only to water systems without full fire protection capabilities.

(1) Sizing of mains. Size all water mains after a hydraulic analysis based on flow demand of not less than 1 gal/min per service connection. The minimum size of water mains is 2 inches in diameter.

(2) Hydrants. Fire hydrants with pumper outlets shall not be connected to water systems or mains unless the system is designed to carry fire-flows.

(3) Valves. Locate valves at not more than 1 mile intervals and at all branch lines from the main line.

SUBCHAPTER 21. DESIGN STANDARDS FOR MINOR SYSTEMS [REVOKED]

Section

252:626-21-1. General requirements for permittees [REVOKED]

252:626-21-2. Water wells [REVOKED]

252:626-21-3. Slow sand filter systems [REVOKED]