Code of Maine Rules › 02 - DEPARTMENT OF PROFESSIONAL AND FINANCIAL REGULATION › 385 - MANUFACTURED HOUSING BOARD › Chapter 850 - COMMUNITY LICENSING - STANDARDS › Appendix 385-850-B - STREET CONSTRUCTION STANDARDS FOR MANUFACTURED HOUSING COMMUNITIES

Current through 2024-29, July 17, 2024
Roadways
A. Minimum thickness of material after compaction
Street Materials
Minimum
							 Requirements
Aggregate sub-base course (Max sized stone
							 4")
12 inches1
Crush aggregate base course
3 inches
B. Before clearing has started on a community street, the
				  center and side lines of the new street shall be staked or flagged at fifty
				  foot intervals.
C. It is recommended that before grading is started, the
				  entire community street shall be cleared of all stumps, roots, brush, and other
				  objectionable material. All ledge, large boulders and tree stumps shall be
				  removed from the community street.
D. All organic materials shall be removed to a depth of two
				  feet below the subgrade of the street. Rocks and boulders shall also be removed
				  to a depth of two feet below the subgrade of the roadway. On soils which have
				  been identified as not suitable for roadways, the subsoil shall be removed from
				  the street site to a depth of two feet below the subgrade and replaced with
				  material meeting the specifications for gravel aggregate sub-base below. The
				  subgrade shall be sloped to provide proper drainage.
E. Except in a ledge cut, set slope shall be no steeper than
				  a slope of three feet horizontal to one foot vertical, and shall be graded,
				  loomed, limed, fertilized, and seeded according to the specifications of the
				  erosion and sedimentation control plan.
F. It is suggested, when possible, that all underground
				  utilities be placed behind the homes, however, those installed under streets
				  shall be installed prior to paving to avoid cuts in the pavement. It is
				  recommended that building sewers and water service connections shall be
				  installed to the edge of the community street prior to paving.
G. The aggregate sub-base course shall be sand or gravel of
				  hard durable particles free from vegetation matter, lumps or balls of clay and
				  other deleterious substances. The gradation of the part that passes a 4 inch
				  square mesh sieve shall meet the following grading requirements:
Sieve
							 Designation
Percentage by Weight Passing Square Mesh
							 Sieves
1/14 inch
25-70%
No. 40
2-30%
No. 200
1-7%
H. Aggregate for the sub-base shall contain no particles of
				  rock exceeding four inches in any dimension.
I. The aggregate base course shall be sand or gravel of hard
				  durable particles free from vegetative matter, lumps or balls of clay and other
				  deleterious substances. The gradation of the part that passes a 3 inch square
				  mesh sieve shall meet the following grading requirements:
Sieve
							 Designation
Percentage by Weight Passing Square Mesh
							 Sieves
1/2 inch
45-70%
1/14 inch
30-55%
No. 40
5-20%
No. 200
1-5%
J. Aggregate for the base shall contain no particles of rock
				  exceeding three inches in any dimension.
K. Pavement joints. Where pavement is used and joins an
				  existing pavement, the existing pavement shall be cut along a smooth line and
				  form a neat, even, vertical joint.
L. Pavements. It is recommended, if pavement is used, that
				  minimum standards for the base layer of pavement shall be the Maine Department
				  of Transportation specifications for plant mix grade B with an aggregate size
				  no more than 1 inch maximum. It is recommended that minimum standards for the
				  surface layer of pavement shall meet the MDOT specifications for plant mix
				  grade C with an aggregate size no more than 3/4 inch maximum.
M. Roadway Width and Grade. The traveled width of a one-way
				  street shall be a minimum of 12 feet. The traveled width of a two-way street
				  shall be a minimum of 18 feet. If the road is paved, there shall be adequate
				  shoulders to support the pavement. The roadway grade shall not exceed 10%.
Footnote:
(1) The 12" aggregate base is in most instances not
				  acceptable for municipal streets. If your long range plan is to have your
				  community streets accepted as public ways, you should check with your
				  municipality. Most municipalities require at least 18" aggregate subbase.
Intersections
A. Grades of all streets shall conform to the terrain so that
				  cut and fill are minimized.
B. Where community streets intersect with public roads,
				  recommended sight distances, as measured along the public way which traffic
				  will be entering, and based upon the legal speed limit, are as follows:
Legal Speed Limit (mph)
25
30
35
40
45
50
55
Sight distance (feet)
250
300
350
400
450
500
550
C. Sight distances shall be measured from the driver's seat
				  of a vehicle standing on that portion of the exit with the front of the vehicle
				  at the stop line of the community street, with the height of the eye 31/2 feet,
				  to the top of an object 41/2 feet above the pavement.
D. When necessary, corner lots shall be cleared of all growth
				  and sight obstructions, including ground excavation, to achieve the required
				  visibility.