[Amended 6-7-2005 by Order No. 34-05]
A. Street classification definitions. As used in this
section, the following terms shall have the meanings indicated:
ARTERIAL STREET
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.
B. 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.
(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.
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.
[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.
[Amended 6-7-2005 by Order No. 34-05]
A. 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.
B. 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]
C. 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.
D. 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.