BIG SKY STANDARD SPECIFICATIONS & DRAWINGS

This is a living document that is continually edited and updated, please check frequently for updates.

There are some unique challenges to successfully installing water and sewer infrastructure in the Big Sky area. Our climate and steep terrain create challenges such as high working pressures and frost depths not encountered in most places. The goal of these special provisions, standard drawings and approved parts list is to assure the best available installation methods are used. If you have any questions or suggestions regarding these drawings or specifications, please feel free to contact us.

We are continually reviewing and updating our approved parts list. If your part is not listed please contact vince@wsd363.com, to get you part added to the list or for an explanation of why it is not allowed. If you feel you have a quality part not listed, please let us know, we would love to hear about it.

Thank you.

QUICK REFERENCE GUIDE

Excavators/Contractors

Ready to install the water/sewer service line?

  • Do you fully understand Big Sky County Water & Sewer Districts requirements and specifications for installation of water/sewer service lines?
  •  Have all the permit fees been paid?
  • Do you have clear access to your curb stop valve box? Is it damaged?
  •  Do you have the appropriate approved parts for the job? (Listed below)
  • Have you given Big Sky Water & Sewer Operators 48 hours’ notice that you would like to schedule a service line inspection?

Parts List

Water

Sewer

Plumbers/Contractors

Ready for water to be turned on?

  • Do you fully understand Big Sky County Water & Sewer Districts requirements and specifications for plumbing, metering, and fire suppression.
  • Do you have Cat 5 wire installed from the meter location to a location outside of the house at least 3.5′ above finish grade?
  • Are all of the appropriate parts for your system, (mentioned below), installed in the correct order and orientation?
  • Is there permanent heat in the unit?
  • Have you given Big Sky Water & Sewer Operators 48 hours’ notice that you would like to schedule having the water turned on?

Parts List

  • Ball Valve (Under 2″) Watts LFB6800
  • Gate Valve (2″ and up) Watts ES-405NRSRW
  • Wye Strainer – Watts Brass Wye Strainer LFS777SI
  • Pressure Reducing Valve (PRV) – Watts U5B-Z3
  • Double Check Back flow Prevention Assembly (DC) – Watts 007M1QT-S “For Domestic System”
  • Reduced Pressure Principal Back flow Prevention Assembly (RPZ) Watts 009QT-S “For Fire Suppression System” CHECK YOUR ORIENTATION, THE MODEL LISTED MUST BE INSTALLED HORIZONTALLY and THE FLOOR DRAIN MUST ACCOMMODATE THE FULL FLOW AT THE INLET OF THE WATER SERVICE LINE.

Standard Water Drawings

Index NumberDescriptionRevision Date (Month-Year)
BSWSD 22-01Water Valve Adjustment DetailJan-20
BSWSD 22-02ATypical Utility Trench – 1Jan-20
BSWSD 22-02BTypical Utility Trench with Pavement Surface Restoration – 2Jan-20
BSWSD 22-03Trench Plug Excavation DetailFeb-20
BSWSD 26-01Thrust Blocking for Water Main FittingsDec-20
BSWSD 26-02Water and Sewer Main and Service SeparationDec-20
BSWDS 26-03Water Main Valve InstallationJan-20
BSWSD 26-04Fire Hydrant SettingJan-20
BSWSD 26-05Fire Hydrant Location Detail with Road Side Pull-OutJan-20
BSWSD 26-06Water Service LineJan-20
BSWSD 26-07ATypical 2″ Blow-Off HydrantJan-20
BSWSD26-08Bollard Placement at Fire HydrantJan-20
BSWSD-26-10Typical Valve/Tee RestraintDec-20
BSWSD 26-11Water Main Crossing Below Existing Sewer LineJan-20
BSWSD 26-12Water Main Crossing Below Existing Sewer LineJan-20
BSWSD 26-14Standard Fire Service Line Class I-VDec-20
BSWSD 26-15Gate Valve & Valve Box InstallationJan-20
BSWSD 26-18Buried Water Service Line InsulationMay-20
BSWSD 26-19Typical 8″ x 3″ PRV StationJan-20
BSWSD 26-20AMueller/Hunt 1″ Single Meter Coil PitMay-10
BSWSD 26-20BFord 1″ Single Meter PitMay-10
BSWSD 26-21Mueller 18″ Flat Lid with 2″ Touch Read HoleMar-16
BSWSD 26-22AResidential Water Service Line With Pit-Set Meter Transceiver Unit (MXU)Jan-20
BSWSD 26-22BShared Fire and Domestic Water Service Line With Pit-Set Meter Transceiver Unit (MXU)Jan-20
BSWSD 26-23AResidential Water Service Line With Non Pit-Set Wall Mounted Meter Transceiver Unit (MXU)Jan-20
BSWSD 26-23BShared Fire and Domestic Water Service Line With Non Pit-Set Wall Mounted Meter Transceiver Unit (MXU)Jan-20
BSWSD 26-24Residential Irrigation System – Outside Installation With Above Ground Backflow VaultMay-10
BSWSD 26-25Residential Irrigation System – Inside Installation With Meter and Back flow in Basement or CrawlspaceJan-20
BSWSD 26-26Pipe To Pipe Connection DetailDec-20
BSWSD 26-27Water Services With A Common Trench For Multi-Plex UnitsJan-20
BSWSD 26-29AIrrigation Water Vault – Vertical Pluming InstallationMay-10
BSWSD 26-31Air Release Valve and Vault 8″- 12″ Water MainsMay-10
BSWSD 26-32Shared Fire and Domestic Service Line for Sizes 2″ and SmallerJan-20
BSWSD 26-33Shared Fire and Domestic Service Line for Sizes 4″ and LargerJan-20
BSWSD 26-39Domestic Service Line for 2″ and SmallerJan-20

Standard Sewer Drawings

Index NumberDescriptionRevision Date (Month-Year)
BSWSD 22-02ATypical Utility Trench – 1Jan-20
BSWSD 22-02BTypical Utility Trench with Pavement Surface  Restoration – 2Jan-20
BSWSD 22-03Trench Plug Excavation DetailFeb-10
BSWSD 26-02Water and Sewer Main and Service Separation Dec-19
BSWSD 27-01Sanitary Sewer Service LineMay-10
BSWSD 27-02Typical Sanitary Sewer Service Line Installation with Clean OutsMay-10
BSWSD 27-03Sanitary Sewer ManholeMay-10
BSWSD 27-04Flat-Top Sanitary and Storm Sewer ManholeMay-10
BSWSD 27-05Nomograph for Air Testing Gravity Sewer MainsFeb-10
BSWSD 27-06Typical Residential Sewage Lift Station (Solids Handling Type)Feb-10
BSWSD 27-07Typical Manhole Channel DetailsFeb-10
BSWSD 27-08Standard Manhole Cast Iron CoverFeb-10
BSWSD 27-09Standard 24″ Cast Iron Manhole RingFeb-10
BSWSD 27-10Typical Grease InterceptorFeb-10
BSWSD 27-11Typical Forced Main Connection to Gravity Sewer MainFeb-10
BSWSD 27-12Buried Sewer Service Line InsulationMay-10
BSWSD 27-13Protective Barrier Sleeve & Cover for Sanitary Sewer Service Clean outJun-10
BSWSD 27-14Spanish Peaks Sanitary Sewer Service Index MapJul-10
BSWSD 27-15Spanish Peaks Grinder Pump Sewer ServiceJun-10
BSWSD 27-16Spanish Peaks “Step” Installation Phase 1B &1CJun-10
BSWSD 27-17Spanish Peaks “Step” Installation Phase 2Jun-10

Water and Sewer Service Line Installation Check List

  1. A Sewer/Water Connection Inspection Permit must be obtained from the District before any connection is made to the District’s sewer collection system or water distribution system. AN APPROVED SEWER/WATER CONNECTION INSPECTION PERMIT MUST BE MADE AVAILABLE AT THE JOB SITE UPON REQUEST (Section 304, WSD363 Ordinance 97-1001).
  2. The owner is responsible for the cost of the sewer and water services from the building drain to the lateral stub at the property line (WSD363 Ordinances 97-1001 and 99-1002).
  3. All sewer lateral stubs shall be located by the District personnel with the best information available. The owner or their contractor is responsible for finding the sewer lateral stub.
  4. All connections to the District’s public sewer & water systems shall be to the sewer lateral stub and/or water service curb stop at the lot line. If a sewer lateral stub and/or water service curb stop have not been stubbed to the lot line, then the Owner will be responsible for the cost of installing a lateral and/or curb stop from the main line to the property line.
  5. Before installing a sewer or water service, the contractor should inspect the existing sewer lateral stub at the property line (if one exists) to determine if there is enough pitch from the structure to the sewer connection, and the location of the water curb stop.
  6. The contractor is responsible for maintaining all service line set back requirements to structures, lot lines, private wells, etc. Where applicable, the contractor and home owner are responsible for any variances needed to install either a sewer or water service line.
  7. All sewer laterals and water services must be constructed and laid in accordance with the Montana Public Works Standard Specifications, or any other applicable regulations of the District including but not limited to the following specifications: 
    a. Pipe Bedding – 6″ under lateral and 6″ over lateral piping, using 3/4″ WASHED ROCK as bedding material is required (Section 02221 and Standard Drawing 02724-1)
    b. Minimum Slope –  All sewer laterals must be installed at a minimum slope of 2.00% (1/4″ PER FOOT) (Standard Drawing 02724-1)
    c. Clean Outs – One DOUBLE SWEEP TEE  is required within 10 feet from the building, and a DOUBLE SWEEP TEE every 100 feet thereafter (Section 406 and 1107, Uniform Plumbing Code), and a DOUBLE SWEEP TEE shall also be installed at the lot or easement line. All clean outs must have cast iron covers.
    d. Locate Wire – All sewer laterals and water service lines must be installed with locate wire, #12 AWG insulated, and locate tape 2 feet above sewer lateral and/or water service line.
    e. Materials –  All SEWER LATERAL pipe shall be schedule 40 PVC. No thin wall pipe (including schedule 35 PVC) is permitted. All WATER SERVICE LINES  shall be a minimum of 1 inch diameter and shall be class SDR-7, PE-3408 polyethylene pressure pipe minimum of 200 psi pressure rating. Pipe shall be Phillips Driscopipe Ultra line 5100 or a District approved equal.
    f. Accessibility –  All CLEAN OUTS and CURB STOPS will be readily accessible at the completion of the project.
  8. All septic tanks, holding tanks, and dry wells must be pumped out and abandoned in accordance with all state and local regulators.
  9. All sewer laterals and water services must be inspected, tested and approved by a representative from the District prior to back filling over the sewer and water services.
  10. The sewer and/or water lateral contractor must have the site prepared safe for inspection and connection to the public sewer and/or water systems.
  11. In areas where groundwater conditions necessitate dewatering, the sewer lateral contractor shall use appropriate dewatering equipment and comply with all local and state regulations. The sewer lateral contractor shall not use any part of the District;s sewer collection system for trench dewatering.
  12. The sewer lateral contractor is responsible for the removal of any mud, sand, or other debris which enters the sewer system as a result of the lateral installation procedure.
  13. The sewer lateral and/or water service contractor is responsible for any damages, or disturbance to the public right-of-way and roads. Restoration of the public right-of-way will be the responsibility of the sewer lateral and/or water service contractor. The restoration work must be completed in a manner that is satisfactory to the District. (Section 608, WSD363 Ordinance 97-1001).
  14. Sewer/Water Connection Permits are generally valid for a period of ONE YEAR for most projects from the date of issuance. Te sewer and water laterals must be installed and inspected within the term of the permit, if they are not, the owner may file for a permit extension. If construction has not commenced within one year form the date of permit issuance the permit will become null and void.
  15. Sewer laterals and water service laterals shall not be laid in a common trench. At least 10 feet of separation must be maintained without prior approval of the District, If sewer & water lines cross. at least 18 inches of separation must be maintained,
  16. See District website WWW.BIGSKYWATERSEWER.COM for more information about the District’s Standard Specifications and Requirements.

Approved Water Parts List

BALL VALVE (Under 2")

GATE VALVE (2" and up)

OS&Y VALVE (4" and up)

WYE STRAINER

PRESSURE REDUCING VALVE (PRV)

DOUBLE CHECK BACKFLOW PREVENTION ASSEMBLY (DC)

REDUCED PRESSURE PRINCIPAL BACKFLOW PREVENTION ASSEMBLY (RPZ)

“RPZ’s” are primarily used on fire suppresion systems, please use “DC’s” (Double Checks) on domestic systems.)

WATTS 009QT-S
AMES 4000B

TRACER WIRE (BLUE WIRE MUST BE USED FOR WATER)

LOCATE TAPE (2" FOR SERVICE LINE, 6" FOR MAIN LINE)

MUST BE FOR POTABLE WATER

INSULATION (BLUE BOARD)

SERVICE LINE WATER PIPE

CURB BOX

CURB STOPS

“Compression Fittings MUST Have Pack Joint Nut”

A.Y. MCDONALD – 76104-33
MUELLER 25142N
A.Y. MCDONALD – 76104-33
A.Y. MCDONALD – 76105
A.Y. MCDONALD – 76104Q (Not Allowed)
FORD – B44 CTS
FORD – B66 IPS

“Stop & Waste” Curb Stops Are NOT Allowed

TAPPING SLEEVES

SMITH BLAIR 662 (Allowed ONLY up to 12″)
FORD FTSS (Allowed ONLY up to 12″)

SERVICE SADDLES

CORPORATION STOPS

BLOW-OFF HYDRANT

MAINLINE WATER PIPE

Ductile Iron Class 51 ONLY (If you job involves another type of pipe contact one of our operators immediately!) 

CLASS 51 DUCTILE IRON TYTON JOINT PIPE
CLASS 51 DUCTILE IRON US PIPE
CLASS 51 DUCTILE IRON MCWANE
C-900 NORTHERN PIPE (Not Allowed)
C-900 BLUE BRUTE (Not Allowed)
C-900 DIAMOND (Not Allowed)

"GRIPPER GASKET"

VALVE BOX

SIP INDUSTRIES
STAR PIPE
TYLER UNION
SIGMA

“Valve Extensions” Must NOT Be Secured With Nut

VALVE BOX EXTENSION

MECHANICAL JOINT FITTINGS

GATE VALVES (MAINLINE)

MUELLER A-2361
MUELLER A-2361-19
MUELLER A-2361-6
MUELLER A-2361-23
C 509 Kennedy Gate Valve (May only be used with special approval contact BSWSD water operators for details.)

RESTRAINT JOINTS

MECHANICAL COUPLINGS

HYMAX 2 (May only be used with special approval contact BSWSD water operators for details.)
SMITH BLAIR QUANTUM (May only be used with special approval contact BSWSD water operators for details.)
ROMAC ALPHA 8″-12″ Installation Guide
ROMAC MACRO 4″-12″
ROMAC SST DI FLANGE (May only be used with special approval contact BSWSD water operators for details.)

JUMPER BONDS AND CAD WELD

FIRE HYDRANTS

Approved Sewer Parts List

TRACER WIRE (GREEN WIRE MUST BE USED FOR SEWER)

LOCATE TAPE (2" FOR SERVICE LINE, 6" FOR MAIN LINE)

MUST BE FOR SEWER

INSULATION (BLUE BOARD)

SEWER SERVICE LINE PIPE

MAINLINE SEWER PIPE

SEWER PIPE FITTINGS (MAINLINE)

CLEAN OUT COVER (MONUMENT COVER)

Frequently Asked Questions

What kind of bedding do I need?

3/4″ Washed Rock.

Can I use any other type of bedding?

No, 3/4″ Washed Rock is the only type of bedding allowed in the Big Sky County Water & Sewer District.
Sand, pea gravel, 3/4″ screened rock, and/or crusher fines are NOT allowed.

How much bedding do I need?

6″ on all sides of pipe, underneath, above and on both sides the width of the ditch.

How deep does my water line need to be?

7′ Minimum 8′ Maximum, Foam Board Insulation must be installed under all driving surfaces.

Do I need tracer wire and locate tape?

Yes, all potable water lines must have both tracer wire and locate tape. Tracer wire is to be taped to the pipe every 5′. Locate tape is to be installed 2′ above the water line.

Do I need to use polywrap on water mains?

No, but we do recommend using poly wrap around valve boxes and fire hydrants (to allow for easy adjustment (valve box) and to protect the weep hole from clogging(fire hydrant).

What kind of wye can I use at the sewer clean out?

All wye’s for sewer clean outs MUST be double sweep stlye.