Improvement Plans

Review Process

  1. Submit the hardcopy improvement plans to the Subdivision Plan Review offices located at 280 N. Decatur, Las Vegas, Nevada.
    • Note: Improvement plans can only be submitted with or after the tentative and final maps.
  2. Pay plan review fee
  3. A comment letter will be sent approximately 30 days after submission only if we require additional information. No letter will be sent if plans are approved.
  4. If the initial improvement plan is not approved a corrected improvement plan must be resubmitted via Subdivision File Manager. You will receive an email approximately 30 days after resubmitting the improvement plan.
  5. A resubmittal fee of $239 is charged.
  6. Final approval of the improvement plan occurs when the following conditions have been met:
    1. All issues addressed, if any, per the comment letter.
    2. Health district approval of the tentative and final maps
    3. Written approval from the sewer utility
    4. Written approval from the water utility
    5. Written approval from the Division of Environmental Protection for both the tentative map and the final Map
    6. Fees are paid
  7. Construction can begin when final map is recorded.

Required on Improvement Plans

For resubmittals of Improvement Plans, email the revised drawing(s) referenced in the comments to ipreview@snhd.org. Please include the name of the project in the subject line.

Improvement Plans are reviewed for:

  1. Water Notes:
    1. Include note: “All construction and material shall be in accordance with whichever edition of the Uniform Design and Construction Standards for Water Distribution Systems (UDACS) that was adopted by the agency.
    2. Other water agencies such as the Virgin Valley Water District who have not adopted the UDACS shall have their standards referenced under the Water Notes.
    3. Include note on flushing, disinfecting of water lines, and water sampling.
  2. Sewer Notes:
    1. Include note: “All construction and materials shall be in accordance with the latest edition of the Design and Construction Standards for Waste Water Collection Systems for Southern Nevada.”
  3. Lot count on the Improvement Plans matches the lot count on the Final Map.
  4. Provide/show utility easement(s) on the Improvement Plans that agree(s) with those shown on the Final Map.
  5. Provide/show connection of proposed sewer main(s) to existing sewer main(s) on the Tentative Map and Improvement Plans.
  6. Provide/show point of connection of proposed water main(s) to existing water main on the Tentative Map.
  7. Provide/show point of connection of proposed sewer lateral(s) to lots or services to condo units and commercial buildings.
  8. Sewer lateral less than 8 inches in diameter shall not be connected into a manhole or manhole stub.
  9. Provide/show a Residential Sewer Backwater Valve for lots where the rim of the next upstream sewer manhole is at a higher elevation than the finished floor of any lot (see grading plan).
  10. Provide/show all water lateral(s) to lots or services to condo units and commercial buildings.
  11. Provide/show sewer laterals or sewer stub outs to future lots if the proposed main extends into a different phase.
  12. Provide/show the blow-off assembly or fire hydrant at the end of water mains.
  13. Provide/show either 10 feet minimum horizontal separation between any water main 6 inches in diameter or larger and sewer mains, or 5 feet minimum horizontal separation and 18 inches minimum vertical separation and pipe installation in separate trenches. (Refer to UDACS for alternate installations/standards that must be detailed on plans.)
  14. Provide/show 10 feet minimum horizontal separation between the water main 6 inches in diameter or larger and any sewer service (lateral) or sewer manhole.
  15. Provide/show 10 feet minimum horizontal separation between any fire hydrant and sewer service (lateral) or 5 feet minimum horizontal separation and 18 inches minimum vertical separation and laid in separate trenches.
  16. Provide/show 10 feet minimum horizontal separation between any fire hydrant lateral and sewer main or 5 feet minimum horizontal separation and 18 inches minimum vertical separation and laid in separate trenches.
  17. Provide/show 4 feet minimum horizontal separation between any water service (lateral) (< 6″ φ) and any size sewer pipe, outside edge of a sewer manhole or a drop inlet.
  18. Label/show to scale perpendicular water lines on profile that cross sewer or storm sewer lines.
  19. Vertical separation of storm sewer (drain) to sanitary sewer. Provide 1 foot minimum (UDACS) where storm drain is above sanitary sewer or use sand-cement slurry to separate utilities.
  20. Per UDACS 3nd Edition:
  21. Per UDACS 3nd Edition:The minimum Depth of Cover atop a water line is now 42 inches and varies depending on pipe diameter (φ) and Right of Way. Reference UDACS 3nd Edition, pages 2-12.
  22. Provide/show the minimum vertical crossing separation of 18 inches between the bottom of the water main/lateral and the top of the sanitary sewer, storm drain or non-potable water lines while maintaining the minimum cover requirement over the water main/lateral.Otherwise, reference the alternate UDACS section for protection of the water line. (Show detail on plans if alternate standard used.)(UDACS 2.22.02, 2.04)
  23. Commercial Subdivisions Only — If all of the onsite Improvement Plans have not been submitted, submit a letter (engineer’s letterhead) stating:
    1. Why all onsite Improvement Plans have not been submitted
    2. Improvement Plans will be submitted to Southern Nevada Health District for review and approval prior to construction
    3. Letter is copied to owner/developer
  24. Reference the name of the Tentative Map on all transmittals.
  25. On any re-submittals, the changes should be noted in the Revision Note Block.
  26. Any Improvement Plan resubmittals with a P.E. stamp/signature dated prior to previous submittal date will be disregarded and not reviewed. (Rev. 07/2004)
  27. For Commercial Subdivisions having an onsite Fire Water Loop connected to the offsite or onsite potable water main by means of a Backflow Prevention Device or pump and separate from the onsite Domestic Water supply line:
    1. The Fire Water is considered nonpotable.
    2. The Fire Water lines will adhere to the UDACS separation requirements of 2.23.01, 2.22, and 2.04 for potable water lines (6 feet minimum horizontal separation).
    3. The Fire Water lines will still maintain separation from storm and sewer lines in order to protect the offsite potable water after the Backflow prevention Device. (Rev. 07/2004)
  28. Provide/show on profile drawing(s), where the junction consists of a smaller branch sewer than the main sewer, that the pipe crowns should be matched. This is in accordance with Design and Construction Standards for Wastewater Collection Systems (DCSWCS) 2.2.17.
  29. Provide/show 10 feet minimum horizontal separation between any fire hydrant drain and sewer line or storm drain line. (UDACS 2.21.03; 2010)
  30. Provide/show a water meter for each water user (NRS 278.385).
  31. Provide/show 18 inches minimum spacing between water laterals.
  32. Provide/show 18 inches minimum spacing between water lateral and end of water main.
  33. Maintain sewer slopes less than 10 percent.
  34. Provide a Plan & Profile View for all streets (displayed on the Utility Plan).
  35. Verify backflow prevention is provided for water laterals servicing common elements.
  36. The P.E. stamp/signature and date will be current and up-to-date.

Letter in Lieu of Improvement Plans

In certain situations, Improvement Plans may not be required. This usually occurs when the Improvement Plans have been previously approved by the health district and no changes are being made to the utilities by the current mapping process.

For example, amended maps with no new Improvement Plans being submitted, or cases where health district has approved the Improvement Plans, but more than one year has elapsed since the date of approval (and Final Map Mylar has yet to be signed by health district).

If an engineer’s letter in lieu of Improvement Plans is to be submitted, the following guidelines must be followed:

  • The letter must be original and on company letterhead
  • Owner/Developer must be copied
  • Must be signed and wet stamped by the P.E.
  • Must include one of the following paragraphs exactly as follows:

For Amended Maps:

“The initial improvement plans (water, sewer, storm drain) for [project name] that were previously approved by the Southern Nevada Health District have not been affected nor revised by this Amended Map.”

OR

For Improvement Plans approved over one year ago:

“The initial improvement plans (water, sewer, storm drain) for [project name] that were previously approved by the Southern Nevada Health District on [date of approval] have not been affected nor revised since the date of approval.”

If you have any questions regarding submitting an engineer’s letter in lieu of Improvement Plans, email us at subdivisions@snhd.org or call 759-0661.

Contact Information

Phone: (702) 759-0661

 

Updated on: May 24, 2019