Chapter 13.60
WATER
Sections:
13.60.250 Air and vacuum release valve.
13.60.270 Backflow prevention.
13.60.290 Water and sewer main crossings.
13.60.350 Street patching and restoration.
13.60.370 Sterilization and flushing.
13.60.100 General.
(1) Any extension of the water system must be approved by the administrator. All extensions must meet or exceed the requirements of DOH, the utility water system plan and the local fire protection authority. It is the applicant’s responsibility to ensure that adequate water for both domestic use and fire protection is available. Proposed analyses, documents and plans must show how water will be supplied, and whether adequate water pressure and volume will be maintained in case of fire. In his or her discretion, the administrator may require an analysis of the system at the applicant’s expense if the administrator determines that the system may be inadequate.
(2) Anyone desiring to extend or connect to the system must contact the utility and make application in accordance with LCC 13.30.100. After the completed application is submitted along with any other information required by the utility division and after project approval is obtained by the applicant from the local jurisdiction overseeing land development activities, the utility division will determine the costs to be paid by the applicant to connect to the water utility. Extensions and connections to the water utility outside of the water service area are permitted only when a demonstrated health risk exists and has been identified in writing by DOH and the applicable local health agency.
(3) All utility construction or reconstruction plans shall be prepared by and bear the stamp of a qualified professional civil engineer licensed in the state of Washington. Final plans and profile drawings must be approved by the county engineer prior to the start of construction. A surety for performance will be required to guarantee the completion or maintenance of the required construction. The amount shall be in an amount equal to 125 percent (or such other percentage as currently required in Lewis County public works contracts) of the cost of the improvements. The applicant is responsible to obtain all applicable permits and approvals before commencement of construction.
(4) Publicly owned utilities are not permitted on private property unless a benefit to the utility system can be demonstrated. Where public utilities are permitted to cross private lands, an easement must be granted to the utility. All easements must be prepared by a land surveyor licensed in the state of Washington capable to perform such work. Utility easements must be at least 20 feet in width. Easements shall be submitted in draft form for review and approval by the utility division prior to approval of construction plans. All costs to prepare and record the easement will be borne by the party requesting the extension or improvement.
(5) Before any water meters will be installed for service, the following requirements for water system improvements must be met: approval and acceptance of the improvements by the administrator; satisfactory testing and sterilization of the improvements; certification of completion of the improvements by a qualified professional civil engineer licensed by the state of Washington overseeing construction; submission of complete as-built plans; provision of adequate surety for performance; proper certifications of all backflow assembly tests per LCC 13.30.150; granting and recording of proper public right-of-way; payment of all applicable fees; written final project approval from the local jurisdiction overseeing land development activities; and written approval by the local building authority.
(6) The Lewis County engineer is authorized to amend the standard plans in this chapter as deemed necessary and appropriate. [Ord. 1265 Att. A, 2016]
13.60.200 Design standards.
(1) Water and sewer design and construction standards apply in the following order of priority: as contained within current, adopted sewerage and water general plans; this chapter; and in the most recent edition of the standard specifications. In the event of a conflict, the administrator shall determine the appropriate design and construction standards to use.
(2) The pipe arrangement of the improvements shall provide for future continuation, extend through the extremes of the property for loop closures and create a looping of the existing system.
(3) The general notes that follow must be included on all plans pertaining to water systems:
GENERAL NOTES (Water Main Installation)
1. All workmanship and material shall be in accordance with Lewis County standards and the most current copy of the State of Washington Specifications for Road, Bridge and Municipal Construction, as published by the Washington State Department of Transportation, American Water Works Association (AWWA) Standards and Washington State Department of Health (DOH) regulations.
2. A preconstruction meeting will be held with the contractor, applicant’s engineer, a utility inspector, a representative of the utility division, a representative of the engineering division of the public works department, and the affected parties before the start of construction.
3. All water lines 8-inches in diameter and larger shall be ductile iron, thickness class 52, rated working pressure of 350 psi conforming to AWWA C151, cement mortar lined conforming to AWWA C104 and push on joints conforming to AWWA C111. Water mains of 4-inches and 6-inches in diameter shall be PVC C-900 class 200. No solvent weld joint pipe is allowed.
4. Fittings shall be ductile iron compact fittings conforming to AWWA C153, C110 or C111. All fittings will be cement mortar lined conforming to AWWA C104. Plain end fittings will be ductile iron if mechanical joint retainer glands are installed on the plain ends. All fittings will be connected by flanges or mechanical joints. If required by the administrator, megalug retainer glands and pipe restraint systems shall be required. These restraint systems shall be as manufactured by Romac Industries, EBAA Iron Inc. or such other equivalent restraint systems as specifically and expressly approved in writing by the Lewis County engineer.
5. Gate valves will be resilient wedge, NRS (nonrising stem) with O-ring seals. Valve ends will be mechanical joint or ANSI flanges. Valves will conform to AWWA 509-80. Valves shall be Mueller, M&H, Kennedy or Clow. Existing valves and all valves installed directly to and connected to a portion of the active water system are to be operated by utility division personnel only.
6. The contractor will timely provide approved traffic control plans in accordance with the “Manual on Uniform Traffic Control Devices” (MUTCD). Traffic control plans must be approved by the agency administering the affected right of ways.
7. The contractor will keep copies of all approved permits and approvals for water main construction on site.
8. All water mains will be staked for grades and alignment by the design engineer or a licensed land surveyor. All vertical control shall be established to be consistent with the datum used by the water utility. Staking will be maintained throughout construction.
9. All water system connections serving buildings or properties with domestic potable water, fire sprinkler or irrigation systems must comply with the minimum backflow prevention requirements established by DOH and the cross-connection control program for the water utility.
10. The contractor must call Utilities Underground Location Center at 1-800-424-5555 a minimum of two business days before any excavations.
11. All pipes and services must be installed with continuous tracer tape and toning wire. Tracer tape will be placed 12 to 18 inches under the proposed finished subgrade. The marker will be of plastic, nonbiodegradable, metal core or backing marked “WATER” that can be detected by a standard metal detector. Tape will be Terra Tape “D” or approved equal. Toning or tracing wire will be UL listed, type UF, 12-gauge solid coated copper wire. The wire shall be taped to the top of the pipe to prevent movement during backfilling, and laid loose enough to prevent stretching and damage before brought up and tied off at the valve operating nut, valve box or meter box. If the operating nut is not easily accessible from the ground surface, the wire will be tied off at the valve box so that the wire is easily accessible from the ground surface. Two (2) feet of slack will be provided to allow for connection to the locator.
12. A minimum cover of 30 inches and a maximum cover of 36 inches over the pipe shall be maintained at all times.
13. All steps of the testing, chlorination and sampling processes must be witnessed by the utility inspector.
14. All pipe and appurtenances shall be hydrostatically tested at 200 psi (min.) for two hours. A pressure drop greater than 5 psig shall constitute a failure and the pipe shall be retested. The contractor’s pressure gage shall be certified for accuracy from a certified testing lab, a maximum of 6 months prior to the start date of construction.
15. Chlorination by means of tablets or powders (dry calcium hydrochlorite) placed in each length of pipe during installation is prohibited.
16. Where the water line crosses a sanitary sewer, the water line shall be above the sewer line with a separation of at least 18 inches between the invert of the water line and the crown of the sewer pipe. If these criteria cannot be met, then the sewer pipe shall be cased within ductile iron pipe for a distance of 10 ft on both sides of the water line.
17. All “long side services” shall be encased in 160 psi pipe and per the following schedule when crossing the right-of-way.
|
3/4" Service |
needs 1.5" diameter casing. |
|
1" Service |
needs 2" diameter casing. |
|
1.5" Service |
needs 3" diameter casing. |
|
2" Service |
needs 3" diameter casing. |
18. The utility must be notified five (5) working days prior to scheduling a water system shutdown. Utility personnel will perform all water system shutdowns. When connections require field verification, the contractor will expose the connection points and have the fittings verified by the utility three (3) working days before the anticipated shutdown date. Shutdowns will not be permitted on Fridays, weekends or holidays without advance written approval from the administrator.
19. When connecting to an existing water line where a new valve is not to be installed, the existing valve must be pressure tested to these standards by the contractor prior to connection. If an existing valve fails the test, the contractor will make the necessary additional provisions to test the new main prior to connecting to the existing system or the contractor will install a new valve. New mains will not be connected to the existing system until all required tests have passed.
[Ord. 1265 Att. A, 2016]
13.60.210 Water main.
(1) Water mains shall be sized to provide adequate domestic and fire flow at the required residual pressure. Fire flow requirements will be determined by the local fire protection authority. Notwithstanding the foregoing, the fire flow shall be no less than 750 gpm at 20 psi residual pressure or the applicable minimum fire flows in WAC 246-293-640.
(2) The minimum water main size will be six inches in diameter where looped and eight inches in diameter to the last fire hydrant where not looped. Larger sized mains may be required as identified by the water system plan or if determined necessary by the administrator to meet fire protection, domestic requirements or future service needs.
(3) All mains that may be extended or looped must end with an approved, flanged gate valve and blind flange, thrust block and blowoff assembly.
(4) All water lines eight inches in diameter and larger shall be ductile iron, thickness class 52, rated working pressure of 350 psi conforming to AWWA C151 and cement mortar lined conforming to AWWA C104. All pipes will be joined using nonrestrained joints that are rubber gasket, push-on type or mechanical joint, conforming to AWWA C111. Water mains shall be PVC C-900 class 200 for 4-inch and 6-inch diameter mains. No solvent weld joint pipe is allowed.
(5) All fittings shall be ductile iron compact fittings conforming to AWWA C153, C110 or C111. All fittings will be cement mortar lined conforming to AWWA C104. Plain end fittings will be ductile iron if mechanical joint retainer glands are installed on the plain ends. All fittings will be connected by flanges or mechanical joints. If directed by the administrator, mechanical joint restraint retainer glands and pipe restraint system shall be required. These restraint systems shall be as manufactured by Romac Industries, MEGALUG by EBAA Iron, Inc., or such other equivalent restraint systems as specifically and expressly approved in writing by the Lewis County engineer.
(6) All pipes and services must be installed with continuous tracer tape and toning wire. Tracer tape will be placed 12 to 18 inches under the proposed finished subgrade. The marker will be of plastic, nonbiodegradable, metal core or backing marked “WATER” that can be detected by a standard metal detector. Tape will be Terra Tape “D” or approved equal. Toning or tracing wire will be UL listed, type UF, 12-gauge solid coated copper wire. The wire shall be taped to the top of the pipe to prevent movement during backfilling, and laid loose enough to prevent stretching and damage before brought up and tied off at the valve operating nut, valve box or meter box. If the operating nut is not easily accessible from the ground surface, the wire will be tied off at the valve box so that the wire is easily accessible from the ground surface. Two feet of slack will be provided to allow for connection to the locator.
(7) The applicant’s engineer will be responsible for determining the scope of work for connection to existing water mains. A minimum of five working days’ advance written notice is required to schedule shutdowns. Shutdowns cannot be scheduled until an application for utility service has been approved and all applicable fees have been paid in full. The utility division will be consulted about required fittings and couplings. It is the contractor’s responsibility to verify the location and depth of the existing main; obtain required fittings; and to furnish all materials, equipment and labor to make the connections to the existing main. The tapping of an existing water main shall be done in the presence of a utility inspector. [Ord. 1265 Att. A, 2016]
13.60.220 Hydrants.
(1) The lead from the service main to the fire hydrant will be ductile iron cement mortar lined class 52, no less than six inches in diameter. A gate valve will be installed a minimum of three feet from the hydrant unless otherwise approved in writing by the administrator.
(2) Fire hydrants shall have two two-and-one-half-inch hose connections, one four-and-one-half-inch pumper connection, a removable Storz one-quarter turn adapter and blind cap attached to the pumper connection. The Storz adapter will include a cap. All threads shall be National Standard Thread. The hydrant will have a positive and automatic barrel drain, breakoff flange on the barrel, breakoff coupling for the stem and of the “safety” or breakaway style.
Hydrants shall be manufactured by Clow Corporation (Medallion), Mueller Centurion, M&H Reliant Style 929, or equal approved in writing by the Lewis County engineer. All hydrants will be bagged and the connecting gate valves will remain closed until the system is tested and approved. Hydrants will be painted with high-grade enamel after installation in the color specified by the local fire authority agency.
(3) The utility division will work with the local fire authority agency to determine hydrant spacing and placement to provide accessibility at all times for fire protection and maintenance. The utility will maintain hydrants that are owned by the utility system. Unless otherwise required by the local fire authority agency, the following guidelines shall apply for hydrants that are owned by the utility division:
(a) At least one hydrant will be installed at all intersections.
(b) Maximum hydrant spacing of 500 feet will be required for residential areas.
(c) Maximum hydrant spacing of 300 feet will be required for nonresidential areas.
(d) The spacing distance for hydrants will be measured along the frontage and accessible side streets. When determining the sufficiency of existing hydrants, hydrants with flows that do not meet the requirements of LCC 13.60.210(1) will not be considered.
(4) The utility division may require hydrants to be protected by two or more posts, four inches in diameter by five feet in height, of reinforced concrete or steel; or other protection as specified in writing by the administrator.
(5) Fire hydrants that will belong to the utility must be constructed and tested prior to acceptance by the utility division. [Ord. 1265 Att. A, 2016]
13.60.230 Valves.
(1) General. All valves and fittings will be ductile iron with ANSI flanges or mechanical joint ends. All existing valves are to be operated by utility personnel only.
(2) Valves shall be installed in the distribution system at sufficient intervals to facilitate system repair and maintenance, but in no case less than one valve every 600 feet. Generally, there will be two valves on each tee and three valves on each cross. Specific requirements for valve spacing will be made at the plan review stage.
(3) Gate valves will be used on all two-inch to 12-inch diameter water lines. The design, materials and workmanship of all gate valves shall conform to the most recent AWWA C509-87. Gate valves will be resilient wedge nonrising stem (NRS) with two internal O-ring seals. Gate valves shall be manufactured by Mueller, M&H, Kennedy or Clow.
(4) Butterfly valves will be used on lines 14 inches in diameter and larger. Butterfly valves will conform to AWWA C504-87, class 150B with cast iron short body and O-ring stem seals. Butterfly valves shall be manufactured by Mueller, Pratt Groundhog, Kennedy or American Darling.
(5) All valves shall have a standard Olympic Foundry 910 or 940 ductile iron water valve box, or equal approved in writing by the Lewis County engineer. The valve box will be set to grade with a six-inch ASTM 3034 SDR 35 PVC riser from valve to approximately six inches from the valve box top. If valves are not set in a paved area, a three-foot-by-three-foot concrete pad four inches thick will be set around each valve box at finished grade. If the valve box is positioned on the road shoulder, the ditch and shoulder shall be graded before placing the asphalt or concrete pad. All valve box components shall be H-20 rated, ductile iron, anti-kickout lids, and marked with “WATER” or “W” on the lids. [Ord. 1265 Att. A, 2016]
13.60.240 Casing.
Steel casing pipe shall be schedule 20 steel or equal approved in writing by the administrator. Casing pipe and pipe spacers will be sized for the pipe being installed with a minimum of three spacers per section of pipe. The casing pipe shall be sand-packed and sealed after the water pipe is installed according to the spacer manufacturer’s recommendations. [Ord. 1265 Att. A, 2016]
13.60.250 Air and vacuum release valve.
Combination air release and vacuum valves (ARV) shall be APCO 140 series, Cla-Val series 36, Val-Matic or Crispin with stainless steel internal components and hardware. Installation shall be set at the high point of the line when required. Where possible, pipes are to be graded to prevent the need for an ARV. ARVs may not be required when services are in the area but the final determination will be made by the administrator. [Ord. 1265 Att. A, 2016]
13.60.260 Blowoff assembly.
If a fire hydrant is not located at the end of a dead end main, a blowoff assembly is required. On water mains that may be extended in the future, the valve that operates the blowoff assembly will be the same size as the main and provided with a concrete thrust block. The pressure rating for blowoff assemblies shall be 200 psi. Adequate drainage must be available for use of the assembly under operating conditions. [Ord. 1265 Att. A, 2016]
13.60.270 Backflow prevention.
(1) All water service connections to serve buildings with domestic potable water, fire suppression, private well, on-site irrigation or other potential backflow hazards shall comply with the backflow requirements established by DOH, Chapter 246-290 WAC and the utility.
(2) All backflow prevention assemblies installed must be of a type and model preapproved in writing by DOH or the utility division, and constructed in accordance with the Uniform Plumbing Code (UPC). The utility division may require additional premise protection when health hazards are known to exist.
(3) All assemblies will be installed behind the utility’s metering device, and within six feet of the meter box or before any other use connection in order to protect the water distribution system.
(4) All installed assemblies must be inspected and approved by a state certified backflow assembly tester (BAT). The property owner shall submit the results of the initial and thereafter annual tests and inspections of all backflow prevention assemblies by a certified BAT to the utility division. All assemblies not passing a test must be repaired immediately.
(5) All costs associated with purchase, construction, inspections, testing, replacement, maintenance, parts and repairs of a backflow prevention assembly are the responsibility of the property owner or customer.
(6) Failure on the part of the water customer to correct all cross-connections in accordance with this title, to test as required, or to bypass an assembly or air gap is sufficient cause for the immediate discontinuance of public water service to the premises. [Ord. 1265 Att. A, 2016]
13.60.280 Service connection.
(1) When water service is desired for a parcel fronting an existing main and within the service area for capacity, but not served by an existing meter setter, an application for utility service must be completed and submitted to the utility division. Upon approval of the application and payment of all applicable fees, the utility division will tap the main and install the meter setter, box and meter.
(2) The contractor shall give the department a minimum of five working days’ advance written notice of any planned connection to an existing pipeline. This includes all cut-ins and live taps. Notice is required so disruptions to existing services can be scheduled. The utility division will provide notice to affected customers 24 hours in advance of the water service interruption. The contractor shall make every effort to schedule water main construction with a minimum interruption of service. In all situations, the utility division shall determine scheduling of water main shutdowns.
(3) All water services shall end within public right-of-way or easements. Shutoff valves shall be located behind the service meter box and constructed with a separate box on the edge or outside of the public right-of-way. All services, meter setters, shutoff valves and meter boxes shall be installed by the contractor. The utility division will install the meters.
(4) Service lines will be one-inch, 200 psi minimum working pressure, SDR 7 polyethylene pipe such as DriscoPlex 5100 Ultra-Line or equivalent product approved in writing by the Lewis County engineer. Service lines shall be installed a minimum of 22.5 degrees off the main. Tracer wire shall be 12-gauge copper with neoprene coating. Tracer wire shall be wrapped around the pipe from the main tap to the meter box with an exposed minimum length of six inches in the meter box.
Service saddles shall be ductile iron with double stainless steel straps as manufactured by Romac or equivalent product approved in writing by the Lewis County engineer. All clamps shall have a rubber gasket.
Corporation stops shall be all U.S. brass with counterclockwise (cc) threads conforming to AWWA C800 unless using a service saddle. If using a service saddle, threads shall be iron pipe threads (IPT). Corporation stops shall be manufactured by Ford or Mueller. Stainless steel inserts are required for all compression grip fittings.
Meter setters shall be no-lead, copper yoke types with ball valve, check valve and double purpose couplings as manufactured by Ford or Mueller.
Meter boxes shall be H20 rated with minimum exterior dimensions of 14 inches by 20 inches by 10 inches deep and ductile iron flip reader lids such as Fogtite No. 1, Fogtite B-9 or equivalent product approved in writing by the Lewis County engineer.
(5) Master meters or metering of service to more than one building shall be approved by the administrator, the local jurisdiction overseeing land development activities and/or local health department. An approved backflow prevention system must be installed in conjunction with any master meter in accordance with WAC 246-290-490 and LCC 13.30.150. [Ord. 1265 Att. A, 2016]
13.60.290 Water and sewer main crossings.
The contractor will maintain a minimum of 18 inches of vertical separation between sanitary sewers and water mains with the water main being at the highest elevation. If the minimum vertical separation cannot be met, then the standards for water-sewer separation in the Department of Ecology’s Criteria for Sewage Works Design shall apply. The longest standard length of water pipe will be installed so that the joints will be equidistant from any sewer crossing. In cases where minimum separation cannot be maintained, it will be necessary to encase the sewer pipe in ductile iron pipe or concrete. No concrete will be installed unless directed by the administrator. [Ord. 1265 Att. A, 2016]
13.60.300 Irrigation.
All irrigation systems shall be installed with a backflow prevention assembly approved in writing by DOH and the administrator. Irrigation sprinklers shall be situated so as to not wet any public street and sidewalk. [Ord. 1265 Att. A, 2016]
13.60.310 Staking.
All surveying and staking will be performed by an engineering or surveying firm licensed by the state of Washington and capable of performing such work. A preconstruction meeting will be held with the county and the staking will be inspected by the county prior to construction. Staking shall be maintained throughout construction.
The minimum staking of water lines shall be as follows:
(1) Stake centerline alignment every 25 feet (50 feet in tangent sections) with cuts and fills to the bottom of the trench maintaining the minimum required depth of cover over the pipe.
(2) Stake locations of all fire hydrants, hydrant flange elevations, tees, water meters, meter setters and other fixtures within the cut or fill to finished grade. [Ord. 1265 Att. A, 2016]
13.60.320 Trench excavation.
(1) Clearing and grubbing where required shall be performed within the public right-of-way or easement as permitted by the local jurisdiction. All debris resulting from clearing and grubbing must be disposed of by the owner or contractor in accordance with the terms of the applicable permits.
(2) Trenches shall be excavated to the line and depth designated by the water utility to provide a minimum of 30 inches of cover over the water pipe. Except for unusual circumstances where approved by the water utility, the trench sides shall be excavated vertically and the trench width shall be excavated only to such widths necessary for adequate working space as allowed by the governing agency. The trench shall be kept free from water until pipe assembly is complete. Surface water will be diverted so as to not enter the trench. The contractor shall maintain sufficient pumping equipment on the job to ensure that these provisions are carried out. Pipe placed in the trench will be sealed with a watertight plug at the end of each day. More frequent use of a watertight plug may be as required by the water utility.
(3) The contractor shall perform all excavation of every description and of whatever substance encountered including boulders, rocks, roots and other obstructions. All material will be entirely removed or cut out to the width of the trench and to a depth six inches below water main grade. Where materials are removed from below water main grade, the trench shall be backfilled to grade with material satisfactory to the county and thoroughly compacted.
(4) Trenching and shoring operations shall not proceed more than 100 feet in advance of pipe laying with approval of the water utility and shall be in conformance with the Washington Industrial Safety and Health Administration (WISHA) and Office of Safety and Health Administration (OSHA) safety standards. The contractor shall continuously maintain the presence of a “competent person” as defined by the Washington State Department of Labor and Industries (L&I) when any trench excavation and backfill work is being done at the project site.
(5) The bottom of the trench shall be finished to grade with hand tools in such a manner that the pipe will have a bearing along the entire length of the barrel. The bell holds shall be excavated with hand tools to sufficient size to make up the joint. [Ord. 1265 Att. A, 2016]
13.60.330 Thrust blocking.
The location of all thrust blocking will be shown on plans. The concrete blocking mix shall be Class 3000 cast against undisturbed earth. A plastic barrier will be placed between all thrust blocks and fittings. MEGALUG restrainers, Romac retainers or restraining rods shall be used in lieu or with thrust blocks. [Ord. 1265 Att. A, 2016]
13.60.340 Backfilling.
Backfilling will not commence until the pipe installation has been inspected and approved by a water utility inspector. Backfilling and surface restoration will follow construction of the pipe so that not more than 100 feet is left exposed during construction hours without approval of the utility division.
Selected bedding material conforming to WSDOT Standard Specifications will be placed and compacted around and under the water mains by hand tools to a height of six inches above the top of the main. The remaining backfill shall be compacted to 95 percent of the maximum density in travel, paved and shoulder areas, and 85 percent in unpaved, nontravel areas.
Backfill and compaction shall be completed to the satisfaction of the jurisdiction over the public right-of-way. If suitable backfill material is not available from the trenching operations, select bedding or gravel base conforming to WSDOT Standard Specifications may be used. At the conclusion of each day the trench shall be totally backfilled or steel plated so that no open excavation is left overnight. [Ord. 1265 Att. A, 2016]
13.60.350 Street patching and restoration.
Street patching and restoration shall be completed to the satisfaction of the local government with jurisdiction over the roadways. [Ord. 1265 Att. A, 2016]
13.60.360 Hydrostatic tests.
(1) Prior to the acceptance of work, the contractor shall conduct a hydrostatic pressure test on the installation. All labor, water, pumps, gauges, plugs, saddles, corporation stops, hoses, chemicals, measuring equipment and incidentals necessary to perform the test will be furnished and operated by the contractor. The contractor’s pressure gauge shall be certified for accuracy from a certified testing lab, a maximum of six months prior to the first start date of construction. The contractor will pay for all water needed for testing at the current rates charged by the utility division. Hydrostatic and bacteriological tests will be conducted after all connections along the section to be tested have been made, underground utilities are installed and the roadway section is constructed to subgrade.
(2) Only utility division authorized personnel shall operate isolation valves. All tests will be made with the hydrant auxiliary gate valves open and pressure against the hydrant valve. After the test has been completed, each gate valve will be tested individually by closing each in turn and relieving the pressure beyond. This test will be acceptable if there is no immediate loss of pressure on the gauge when the pressure comes against the valve being tested. The contractor will verify that the pressure across the valve does not exceed the rated working pressure of the valve.
(3) The section of main to be tested shall be filled with water at a velocity no greater than one foot per second and allowed to stand under pressure for a sufficient length of time to allow air to escape and the pipe lining to absorb water.
(4) The utility division shall be present to witness the test after all air in the main has been released. The test will be accomplished by pumping the main up to 150 psi above the normal operating pressure but not less than 200 psi. After reaching the test pressure, the pump will be stopped for 15 minutes and then the pressure will be brought back up to the test pressure again. Test pressure shall be maintained for two hours. A pressure drop greater than five psig shall constitute a failure and the system shall be retested.
(5) Defective material or workmanship discovered during a hydrostatic field test will be replaced by the contractor at no expense to the utility division. Hydrostatic tests will be made by the contractor until a satisfactory test is obtained. [Ord. 1265 Att. A, 2016]
13.60.370 Sterilization and flushing.
(1) Sterilization of water mains shall be accomplished by the contractor in accordance with the requirements of DOH and current AWWA standards, and in a manner satisfactory to the utility division.
(2) The contractor is responsible for all costs in this section, retesting and associated work to comply with sterilization and flushing.
(3) Chlorination by means of tablets or powders such as dry calcium hypochlorite placed in each length of pipe during installation is prohibited.
(4) The contractor shall prepare a plan for disposal of treated water prior to performing any disinfection. At no time shall treated water from a new main be disposed directly into any water course or natural drainage channel. Sodium ascorbate or other approved chemical shall be used as the neutralizing agent if dechlorination is used. Sodium thiosulfate shall be not be used. Written permission from the sewer agency shall be obtained before disposal to the sanitary sewer is allowed.
(5) Following a successful hydrostatic test, the water main not connected to the existing system shall be relieved of excess pressure and the main left full of the proper chlorine concentration. The line shall be left undisturbed for at least 24 hours but not more than 48 hours before starting the flushing process. Flush thoroughly and as soon as possible after the 24-hour period to minimize prolonged exposure of the pipe to high concentrations of chlorine. The contractor shall flush until the chlorine level in the water leaving the new main is no higher than the distribution system or that level acceptable for domestic use.
(6) The contractor shall take water samples in the presence of utility division inspector at least 24 hours after flushing and disinfecting. Should the initial chlorine treatment result in an unsatisfactory bacteriological test, the procedure must be repeated by the contractor until satisfactory results are obtained. [Ord. 1265 Att. A, 2016]
13.60.380 Pump station.
When a pump station is required to provide the necessary flows for a new development, the applicant shall construct and bear all costs of the pump station, provide training and instructional manuals to the utility division, and associated documentation to the utility division to help maintain the pump station. The pump station shall be designed and certified by a professional engineer licensed by the state of Washington in civil engineering. [Ord. 1265 Att. A, 2016]