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6.20.320 General requirements.
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(1) Work shall be performed only by contractors experienced in installing public water mains.

(2) Prior to any work being performed, the developer shall contact the district’s engineer to set forth his proposed work schedule.

(3) All materials shall be new and undamaged.

(4) Developer shall obtain approval of materials to be used from the district prior to ordering of materials.

(5) Water mains shall be delivered to the site with wrapping to cover the ends of the pipe or with plastic pipe plugs such that pipe is watertight. Either method used shall remain in unbroken condition until the pipe is installed.

(6) Water mains shall be laid only in dedicated rights-of-way or in easements that have been granted to the district. Water mains may be laid within a plat or property identified in the developer extension agreement, subject to dedication of appropriate rights-of-way and recording of appropriate easements at the time the plat and/or warranty bill of sale is filed with the county auditor.

(7) Dead-end lines are not permitted except where the district is satisfied that it would be impractical to extend the line at a future date. Water mains shall extend to the plat line of developable neighboring property for a convenient future connection, and a two-inch blowoff assembly shall be provided on mains eight inches and smaller. A fire hydrant shall be installed on larger size mains to accommodate flushing velocities.

(8) If a service line to a lot is over 200 feet (not including panhandle), the developer shall install a six-inch water main to within 200 feet of the structure being served with a two-inch blowoff at the end in an easement granted to the district. If multiple lot services are required, the 200-foot distance will include the panhandle distance.

(9) All eight-inch and smaller water mains shall have minimum three-foot-six-inch cover from finished grade except four-foot cover in easements. All 12-inch and larger water mains shall have a minimum of four-foot cover from finished grade. The maximum shall be seven-foot cover unless approved by the district. Mains shall generally be located parallel to and 10 feet northerly or easterly of street centerline.

(10) Valves shall be installed at intervals not to exceed 1,000 feet. Valves shall be installed on each leg of all tees and crosses, except fire hydrant tees unless required by the district, and at each end of easements.

(11) Valve markers shall be installed and marked with the distance to valve being referenced for all valves in unpaved areas.

(12) Fire hydrants are required approximately every 600 feet in residential areas and/or located no more than 350 feet from the back of any proposed lot. Fire hydrants are required every 300 feet in commercial areas, or as required by the Fire Marshal. Distances required herein shall be measured linearly along street or road.

(13) Only one fire hydrant shall be installed on any dead-end eight-inch run.

(14) Pipes connecting hydrants to mains shall be at least six inches in diameter, restrained and not longer than 50 feet.

(15) Provide bends in field to suit construction and in accordance with pipe manufacturer’s recommendations so as not to exceed allowable deflection at pipe joints.

(16) Provide thrust blocking or restrained joints at all fittings and bends in accordance with the district standards and conditions. Restrained joint systems required in areas of fill or if installed in previously disturbed soil and where indicated on district standard details.

(17) Provide anchor blocking at all up-thrust vertical bends in accordance with district standards.

(18) Water services shall be Type “K” continuous copper tubing from water main to meter (no joints) for one-inch and two-inch services. Larger service lines shall be the type and style shown in the standard details.

(19) Minimum size service lines between the water main and the water meter shall be one inch for single-family use and two inches for commercial and multifamily use. All meters and private service lines shall be the minimum size by the county plumbing code in accordance with fixture units, unless otherwise specified.

(20) Meter services and meter boxes shall be set to final grade and all adjustments shall be made prior to final pressure testing of the system, except as approved by the district. Developer shall furnish two neoprene gaskets and one dual check valve for each service installed. Service inlet shall be centered at inlet end of box and faced toward outlet end of box parallel with long sides.

(21) All water services shall end within road right-of-way or easements.

(22) All three-quarter-inch-by-five-eighths-inch and one-inch meters will be installed by the district, and the property owner shall pay the current meter installation charge. Meters greater than one inch and up to two inches in size shall be installed by the district and paid by the developer on a time and material basis. For scheduling installation, developers may preorder one-and-one-half- to two-inch meters for consideration of lead time on district purchase. The developer shall furnish all meters larger than two inches in size installed by the developer and locked off by the district until approved for service. District personnel will inspect meter prior to installation to ensure the proper meter and register.

(23) All services other than single-family residential and duplex shall be equipped with a Washington State-approved reduced pressure backflow assembly (RPBA) which shall be located immediately behind and on the property side of the water service box, or at an alternate location as approved by the district. Residential single-family fire meters shall require a minimum of a DCVA at the service connection or at an alternate location as approved by the district. All other connections shall be equipped with an RPBA at the service connection. Commercial fire sprinkler systems, if unmetered, shall require an RPDA at the service connection or at an alternate location as approved by the district. If chemicals of any kind are connected to, or planned for installation on any of the above services (i.e., aspirators, carbonators), the water service shall be isolated from the district’s system by either an AG or RPBA at the service connection or at an alternate location as approved by the district (see Article V of this chapter).

(24) Dedicated irrigation services shall require a minimum of a DCVA at the service connection. Services connected to water features, decorative ponds, pools, spas and fountains which require make-up water shall be protected from backflow into the public water supply by an approved air-gap to be located at the fill point of the pond or water feature. The air-gap shall be inspected by the district prior to use and shall be subject to annual inspection by a Washington State backflow assembly tester (BAT). In all instances, the water supply used for filling purposes shall also be protected by a DCVA or RPBA installed behind the meter at the district’s discretion. All irrigation using chemical feed shall have an RPBA installed immediately behind the meter, no exceptions (see Article V of this chapter).

(25) Developer shall notify the district and obtain approval prior to any water shut-off or turn-on affecting the water system, a minimum of 48 hours in advance.

(26) Cut in connections and wet taps shall not be made on Fridays, the day before a holiday, holidays, or weekends (unless approved by the district). Monday connections may be allowed at district’s sole discretion.

(27) Developer shall use only district approved hot tap vendors to perform work in the district.

(28) All tapping sleeves and tapping valves shall be pressure tested prior to making connection to existing mains.

(29) Road restoration shall be per Snohomish County, city and/or state design and construction standards. Developer shall become familiar with all county, city, and state conditions of required permits, and shall adhere to all conditions and requirements. [Res. 735 § 1, 2017.]

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