Town of Standish, ME Design Standards and New Construction

Standish's arterials are State Routes 11, 25, 35, 113, 114, 237, Saco Road and any street that is designed to be used, or is used, to carry an average daily traffic (ADT) volume of at least 3,000 vehicles per day. These major streets serve to carry high volumes of traffic into, through and out of the Town.

COLLECTOR STREET

A street whose principal function is to carry traffic between local and arterial streets, but that may also provide direct access to abutting properties. It serves, or is designed to serve, directly or indirectly, more than 150 dwelling units but not more than 300 dwelling units, and is designed to be used, or is used, to carry an average daily traffic (ADT) volume of at least 1,500 but not more than 3,000 vehicles per day.

INDUSTRIAL AND COMMERCIAL STREETS

A street that provides access to abutting commercial or industrial properties, the primary function of which is to serve those properties and the development proposed for them. It is designed to be used, or is used, to carry an average daily traffic (ADT) volume of at least 1,000 but not more than 3,000 vehicles per day.

LOCAL STREET

A street whose primary function is to provide access to abutting properties. It serves, or is designed to serve, not more than 150 dwelling units, and is designed to be used, or is used, to carry an average daily traffic (ADT) volume of not more than 1,500 vehicles per day.

Street design standards.

[Amended 3-10-2009 by Order No. 04-09]

(1)

All streets shall be designed to conform to the standards and schematic drawings contained herein.[1]

[1]

Editor's Note: The standards and drawings are included at the end of this chapter.

(2)

The dimensions for street construction shall be as shown in cross sections and as follows:

		Type of Street
Description		Arterial	Collector	Local	Industrial and Commercial
Right-of-way width		80 feet	66 feet	50 feet	66 feet
Pavement width		32 feet	26 feet	22 feet	26 feet
Shoulder width		12 feet	8 feet	1.5 feet	9 feet
Curbing		Vertical	Vertical	Vertical	Vertical
Sidewalk width		5 feet	5 feet	5 feet	5 feet industrial/ 6 feet commercial
Minimum grade		0.5%	0.5%	0.5%	0.5%
Maximum grade		5.0%	6.0%	8.0%	5.0%
Minimum center-line radius		800 feet	230 feet	150 feet	550 feet
Minimum tangent between curves of reverse alignment		300 feet	200 feet	100 feet	300 feet
Roadway crown		1/4" per foot	1/4" per foot	3/8" per foot	1/4" per foot
Minimum angle of street intersections		60	60	60	60
Minimum distance between street intersections
	Same side	400 feet	400 feet	300 feet	400 feet
	Opposite sides	300 feet	250 feet	150 feet	300 feet
Sight distance		250 feet	200 feet	150 feet	250 feet
K factor, crest
	Vertical curve	45	30	15	45
K factor, sag
	Vertical curve	45	35	20	45
Design speed		45 mph	30 mph	25 mph	45 mph
Maximum grade at intersection (width 75 feet of intersections)		2%	3%	3%	2%
Curb radii at intersections (90)		30 feet	20 feet	15 feet	30 feet
60 to 90 intersections		30 feet	30 feet	30 feet	30 feet
90 to 120 intersections		50 feet	40 feet	30 feet	50 feet
Minimum property line at intersections		20 feet	10 feet	10 feet	20 feet

*NOTE: Notwithstanding any other provision of this section, any access strip or right-of-way that is (a) at least 50 feet but less than 60 feet wide throughout its length; (b) was lawfully created prior to June 7, 2005; and (c) is evidenced by a deed or subdivision plan recorded at the Cumberland County Registry of Deeds, shall be allowed to be developed as a local street, provided that all other requirements of this section are met.

(3)

Schematic drawings of street cross-sections.[2]

[2]

Editor's Note: The schematic drawings are included at the end of this chapter.

§ 252-32 Dead-end streets.

This section applies to local streets only. The presentation of special design, discussion and written permission by the Planning Board shall be required for those conditions that may require a dead-end street under the category of collector, arterial, industrial or commercial.

Standards as described in this chapter shall be applicable for dead-end streets. In addition, the following requirements shall be fulfilled:

(1)

The design of streets shall provide for the proper continuation of streets from adjacent subdivisions and built-up areas and proper projection of streets into adjacent unsubdivided and open land.

(2)

The maximum street length of dead-end streets shall be limited to 2,500 feet, measured from the center line of the feeder street to the center of the turnaround radius. However, the Planning Board may allow longer lengths because of property configuration and/or topographical constraints.

(3)

Radii of turnaround at the end shall be as follows:

(a)

Property line: 65 feet.

(b)

Outer edge of pavement: 54 feet.

(c)

Inner edge of pavement: 30 feet.

§ 252-33 Pavement design.

The subdivider shall be required to investigate and determine the types and classifications of the subbase soils. Computations shall be made to determine pavement design standards for construction, which shall be submitted for review by the Public Works Director. If, during construction, subsurface soils vary from original classifications, pavement design shall be modified to meet the new classification. Revised pavement design shall be submitted to the Public Works Director for approval.

§ 252-34 Street construction material standards.

Street construction materials standards as specified herein shall conform to the current specifications of the Maine Department of Transportation.

[Amended 6-7-2005 by Order No. 34-05]

Standards and dimensions tabulated herein shall be considered as minimum.

The specifications for the minimum thickness of materials shall be the same as set forth below:

Minimum Requirements [Amended 6-7-2005 by Order No. 34-05]
Street Materials			Arterial (inches)	Collector (inches)	Local (inches)	Industrial and Commercial (inches)
Aggregate subbase course (Maximum sized stone 6 inches) [M.D.O.T. SPEC 703.06 (b) Type D]			28	24	24	24
Crushed aggregate base course [M.D.O.T. SPEC 703.06 (a) Type A]			4	4	3	4
Hot bituminous pavement Total thickness			5	5	3.5	5
Surface course (M.D.O.T. Type 9.5 mm Grade C)			2	2	1	2
Base course (M.D.O.T. Type 19.0 mm Grade B)			3	3	2.5	3
Sidewalk Materials
	(a) Bituminous sidewalks
		Aggregate sub-base course	8	8	8	8
	Hot bituminous pavement
		surface course	2	2	2	2
	(b) Reinforced Portland cement sidewalks
		Sand base	6	6	6	6
		Portland cement concrete with mesh	4	4	4	4
Curbing materials
	(a) Granite stone curbing		Type 1	Type 1	Type 1	Type 1
	(b) (Reserved)
	(c) Granite stone edging		Type 5	Type 5	Type 5	Type 5
	(d) Bituminous concrete curbing		NP	NP	Cape Cod	NP

NOTES:
	NP = No permitted

§ 252-35 Responsibility of developer regarding streets.

[Amended 6-7-2005 by Order No. 34-05]

If the proposed subdivision as presented shows streets that meet the street classification definitions, then it shall be the responsibility of the developer to meet the requirements for that classification of street.

§ 252-36 Street construction standards.

[Amended 6-7-2005 by Order No. 34-05]

Storm drainage design standards.

(1)

Intent. An adequate storm drainage system, including appurtenances such as catch basins, shall be provided for proper drainage of stormwater collected in streets and areas tributary to the street system. Discharge of the collected storm drainage shall be by piped systems or ditches, when approved by the Planning Board. Appropriate conveyances for outlets to drainage systems must be provided. A minimum width of 30 feet will be required.

(2)

Design standards:

(a)

All stormwater pipe systems within the subdivision shall be designed to meet the criteria of a five-year storm based on rainfall data from weather bureau records in Portland. Flows from a twenty-five-year storm event shall be safely conveyed through the project via ditches and other types of open channel flows. Flows shall be computed by the rational method, with design computations being submitted for approval.

(b)

Upstream drainage shall be accommodated by an adequately sized system through the proposed subdivision for existing conditions and future potential development in the upstream drainage area or areas tributary to the proposed subdivision, as determined by the Planning Board.

(c)

Existing downstream drainage facilities shall be studied to determine the effect of the proposed subdivision's drainage. The developer shall demonstrate to the satisfaction of the Planning Board that the storm drainage from the proposed subdivision will not, in any way, overload existing storm drainage systems downstream from the proposed subdivision.

(d)

No stormwater will be permitted to drain across a street or across an intersection.

(e)

Design standards for drainage systems shall be approved by the Planning Board. Drainage pipe specification shall be determined by the Public Works Director.

(f)

Where open ditches, channels, streams or natural courses are used, either to collect or discharge stormwater, adequately sized perpetual easements shall be provided. The minimum width shall be 30 feet.

(g)

Where subsurface soils are of the nature requiring an underdrainage system, underdrains shall be installed and discharged in a positive manner.

(h)

Street and storm drainage plans. Construction plans for streets and surface drainage systems shall be designed and prepared by a professional engineer registered in the State of Maine. Plans shall show the plan, profile, cross sections and details of appurtenances. Copies shall be submitted to the Planning Board for its review and referral to other Town officials. No construction shall be permitted until the Planning Board has approved such construction plans.

Construction standards:

(1)

Grading. All streets shall be graded to their full width by the subdivider. Street grading, preparation, cuts and fill must be inspected and approved, in writing, by the Public Works Director.

(a)

Preparation. Before grading is started, the entire right-of-way area shall be cleared of all stumps, roots, brush and other objectionable material and all trees not intended for preservation.

(b)

Cuts. Tree stumps and other organic materials shall be removed to a depth of two feet below the subgrade. Rocks and boulders, when encountered, shall be scarified to subgrade.

(c)

Fill. All material used in the construction of embankments shall be of the quality to meet the standards for embankment construction, Section 203.02 through 203.17 of the Maine Department of Transportation Standard Specifications. Excess materials, including organic materials, soft clays, wet and noncompactible materials, etc., shall be removed from the street site. The fill shall be spread in layers not to exceed 12 inches loose and compacted. The filling of utility trenches and other places shall be mechanically tamped.

(d)

Bases and pavement. Where pavement placed joins an existing pavement, the existing pavement shall be cut along a smooth line and to a neat, even, vertical joint. Broken or reveled edged will not be permitted, nor deviation from grade.

(e)

Surface pavement. Surface pavement shall not be placed until the base pavement has gone through one complete winter.

[Added 5-8-2007 by Order No. 25-07]

Monuments.

(1)

Granite monuments shall be set at all street corners, at all points where the street line intersects the exterior of the subdivisions and at an angle points and points of curve in each street. All granite monuments shall be four feet long and six inches above ground, except in lawns, driveways and parking lots, where they shall be flush. If the subsurface is a ledge between one and three feet deep, a two-foot diameter concrete encasement based on the ledge shall be required. If the ledge is less than one foot deep, a one-inch steel rod shall be grouted into the ledge.

(2)

All other corners shall be marked with iron pipe not less than 3/4 inch in diameter and 24 inches long and driven so as to be flush with the finished grade.

Water supply.

(1)

A public water supply system with fire hydrants shall be installed at the expense of the subdivider, or if in the opinion of the Planning Board service to each lot by a public water system is not feasible, the Planning Board may allow individual wells to be used.

(2)

Because they are difficult to maintain in a sanitary condition, dug wells shall be permitted only if it is not economically or technically feasible to develop other groundwater sources.