045-12 Wyo. Code R. § 12-3
(a) Major trunk lines and outfall lines shall not be allowed parallel encroachment in narrow highway rights-of-way, especially if roadway reconstruction, widening, or slope modification is contemplated in the foreseeable future.
(b) When parallel encroachment is allowed, the line shall be located as close to the right-of way line as possible.
(c) Crossings of the roadway and/or paved side streets and approaches may be made by either boring a casing pipe or heavy wall thickness carrier pipe under the roadway template. Crossing of the roadway template shall be as near to perpendicular to the roadway centerline as possible.
NOTE: The requirement for casing of the road crossing shall be specifically discussed between the applicant's engineer and the Department's engineer, and shall, among other things, depend on the pipeline materials used and the system's operating pressure.
(d) Depth of cover shall, at a minimum, be four (4) feet below natural ground or roadway ditch flow line to allow for future installation of storm sewer lines without interfering.
(e) Shallow depth of cover with a protective dirt berm over the top shall not be allowed.
(f) When parallel encroachment within the roadway template and/or the pavement section is unavoidable, the pipe and manholes used shall be able to withstand highway loading, as determined by manufacturers data, and be of the most durable and maintenance free material.
When applicable, large mains and outfall lines shall be cathodically protected.
(g) All manholes shall be constructed flush with the surrounding terrain and if in the paved portion of the roadway in a manner that allows for adjustment for future changes in pavement thickness.
Lift stations shall not be located on the highway right-of-way.
(h) When trenching across the roadway template, paved side streets, or approaches has been specifically approved by the Department's engineer, backfill compaction, pavement repair, and restoration of the highway R/W shall be as directed by the Department.
(i) Bore pits shall be located as described in Chapter 6, Section 13.
045-12 Wyo. Code R. § 12-3