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# Is the offset R or L of an underground sewer in reference to the center line of a roadway?

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## Is the offset R or L of an underground sewer in reference to the center line of a roadway?

(OP)
I am reading utility and civil drawings and there are schedules showing locations of all kinds of pipes under a roadway, such as watermains and sewers. There are offset R/L figures in these schedules, are R or L meaning offset to the Right or Left in reference to the center line of the roadway? How to indicate these offsets at an intersection where the pipe are curving to another road?

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

Can you post an example?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

(OP)
For example, watermain location at 9+856 to 9+875, offset R1.75

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

Generally offsets would be from the centerline of the stationing, which is usually, but not always, the centerline of the roadway.

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

Utility trenches may have their own stationing. In referencing locations, I always try to name the alignment, then station, then offset. From your example, they are using the watermain alignment stationing.

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

If the plans are using the utility alignment, they would probably NOT have a L or R.

As mentioned, this is most likely road BASELINE alignment. (Typically the Baseline IS the center line. However, this is not always the case especially if they are changing the roadway alignment.)

At an intersection, stationing would still be referencing the mainline road in the plan. However, I have also seen where the reference may SPECIFICALLY mention the road name with the station (whether in a leader or in a table).

### RE: Is the offset R or L of an underground sewer in reference to the center line of a roadway?

Any alignment with stationing will have L or R offsets to describe a location that is not on the centerline.

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