Design Considerations for Private Utilities (Directional Bore)

Design & Permitting Requirements

Engineered Plans

  1. Ogden City Engineering requires engineered, detailed plans showing the following:
    1. All Excavation Locations: (including bore pits, vaults, hand-hold boxes, pedestals, etc),
    2. All Proposed Equipment Locations (including vaults, HH boxes, terminals, pedestals, etc)
    3. Alignment of the Bore Path (dimensioned off of back of curb or off of sidewalk),
    4. All utilities that are crossed or running near the proposed bore,
    5. All Utility Easements (Public, Municipal or Private) that are being used within the scope of work being performed.  Streets and properties that do not have utility easements must be identified by leadered notes on each page that said properties appear.
    6. Equipment Specs: Specification sheets for all equipment being installed in the City Right-of-Way or utility easements MUST be included in the plan set.
  2.  Plans cannot show work on private property or success-based (future) work; only currently proposed work that is located in the City right-of-way or in utility easements.
  3. All plans submitted for Directional Bore work must be produced by, stamped, signed and dated by a licensed professional Engineer. 
  4. Plans produced by a company that has a current franchise agreement with Ogden City do not need to be stamped but must bear the logo of the franchised company thereon.
  5. Schematic drawings are not acceptable for submission as “Engineered Plans”.

Drafting/Drawing Standards for Directional Bore Plans

  1. Background:  A recent aerial photo should be used as a background.  This image should be screened or adjusted so that the utility and design linework is clear and legible, while still being able to distinguish surrounding structures (such as houses, sidewalks, streets, etc).
  2. Drawing Scale:  Acceptible drawing scales are as shown:
    1. 1:10, 1:20 – For detailed drawings
    2. 1:30, 1:40 – For standard Site Plan drawings
    3. 1:50 – Maximum Scale for Site Plan drawings.

Drawing scales do not need to be exact, however, drawings with scales that exceed the 1:50 scale (1:60, 1:100, 1:200, etc) will be rejected.

  1. Lineweights:  Use a dark, bold or thicker line to show new, proposed work.   Use thinner, lightweight lines to show existing utilities and other features (sidewalks, curb, etc.)
  2. Legend:  All symbols and linetypes used in a Site Plan for Directional Bore work should be included on a Legend page within the plan set.
  3. General Notes:  Notes specific to the proposed Directional Bore work in Ogden City should be included in the plan set.  Whenever the proposed work encroaches into the UDOT Right-of-Way (including traffic control), then UDOT-specific notes should be included as well.

Bore Path Design Constraints

  1. Background:  A recent aerial photo should be used as a background.  This image should be screened or adjusted so that the utility and design linework is clear and legible, while still being able to distinguish surrounding structures (such as houses, sidewalks, streets, etc).
  2. Path Location: The bore path must be a minimum of 3 feet (3’) BOC (Back of Curb) in areas   with a park strip, and 3 feet (3’) BOW (Back of Walk) where the sidewalk is directly behind the curb, to allow space for water meter boxes behind the curb. 
  3. Deflection:  Maximum allowable horizontal deviation from bore path is 12” in either direction.
  4. Minimum Utility Offsets:
    1. Sanitary Sewer Main: 10 feet (10’)
    2. Water Main & Storm Drain Main: 5 feet (5’)
    3. Gas & Power: 3 feet (3’)
    4. Low voltage/Telecom: 1 foot (1’)
  5. Bore Depth: Minimum allowable cover of conduit installed by directional bore is 24 inches (2’), unless a greater depth is specified in the submitted plans.
  6. Road Crossings: All utilities must be potholed for depth & location verification wherever the bore path crosses a public or private road.
  7. Moratorium Roads:  Bore paths cannot cross Moratorium roads (roads that have been recently repaved or reconditioned) unless approved by City Engineer.

Equipment

  1. All utility cabinets must be located back of walk in the PUE/MUE. No cabinets are allowed in the park strip unless expressly authorized by the City Engineer.
  2. No vaults, handholes or other similar equipment shall be installed underneath the City sidewalk.
  3. No bore alignments shall run underneath City sidewalks unless approved by City Engineer.
  4. No utility cabinets are allowed within intersection sight triangles, as defined in Ogden City Code 7-3-2 and as shown in Figure 6-1.
  5. No vaults, handholes or other underground boxes are allowed in the  “corner zone” due to current and future ADA ramp placements.

  

Sight Triangle and Corner Zone