Pre-marking Guidelines

Statewide Marking Guidelines for Underground Line Owners                         


Following are statewide marking guidelines:

  • The width of each mark should be approximately 2″.
  • The length of each mark should be approximately 12″ – 18″.
  • The distance between marks depends on site conditions, but should be no greater than 20′.
  • Company identification should be painted at reasonable intervals to allow quick identification.
  • End marks should contain arrows if line continues.
  • The size of any painted text does not expand the tolerance zone.

 MARKING SAMPLES
(Company names used below are for illustrative purposes only.)

 

LINE

 

Any single underground line less than 12" in diameter.
Single conduit.

 

CORRIDOR

 

Used when multiple underground lines cannot be specifically delineated. Mark should represent located outside edges and number of underground lines whenever possible.

 

OVERSIZED

 

Any underground line 12" or greater. Marks should represent outside edges of the underground line.

 

DUCT PACKAGE

 

Marks should represent outside edges of the underground line whenever possible.

 

HIGH PRESSURE GAS LINES

 

Company should indicate that the line is high pressure gas.

 

TERMINATION POINT

 

 

OFFSETS

 

Used when marks cannot be placed directly above the buried line.

 

NO CONFLICT

 
 
NO/COMEDRecommend
company name
with the word NO
NICOR/OK

Recommend
company name
with the word NO
 

BURIED SPLICES, VALVES, MANHOLE LIDS

 

Circle should represent approximate size of the buried line.

 

STREET LIGHTS

 

 

TRAFFIC CONTROL