[Ord. No. 11-2I 118 §1, 5-12-2016]
A.
Street Construction. City streets shall be constructed
in accordance with the City of Farmington, Missouri, General Conditions
and Technical Specifications for Public Improvements.
1.
The streets are to be constructed of Portland cement concrete
with integral curb (or concrete curb and gutter) or bituminous plant
mix roadway with a concrete curb and gutter. Alley pavement shall
be of either asphalt or concrete design, with an inverted crown and
the curb omitted. Asphaltic streets will require a wearing course
on "full depth" asphalt base.
2.
Subbase, aggregate base, asphalt and concrete compacted thicknesses
are shown below in Table VII-1.
|
Table VII-1
| |||
|---|---|---|---|
|
Design Characteristics of Street Pavement
| |||
|
Concrete
| |||
|
Type of Street
|
Minimum Uniform Thickness
(inches)
|
Type 5 Aggregate Base Course
(inches)
| |
|
Primary Arterial
|
8
|
4
| |
|
Secondary Arterial
|
8
|
4
| |
|
Collector
|
8
|
4
| |
|
Local (Residential)
|
6
|
4
| |
|
Local (Non-Residential)
|
8
|
4
| |
|
Alley
|
6
|
4
| |
|
Asphalt
| ||||
|---|---|---|---|---|
|
Type of Street
|
Surface Wearing Course
(inches)
|
Base Asphalt Base
(inches)
|
Type 1 Aggregate Base Course
(inches)
| |
|
Primary Arterial
|
2
|
8
|
8
| |
|
Secondary Arterial
|
2
|
8
|
8
| |
|
Collector
|
2
|
6
|
8
| |
|
Local (Residential)
|
2
|
3
|
6
| |
|
Local (Non-Residential)
|
2
|
4
|
6
| |
|
Alley
|
2
|
3
|
6
| |
3.
Subgrade soil inspection shall consist of following two (2)
methods:
a.
Moisture and density control. When compaction
of embankment is a requirement of the contract and testing has been
specified as a pay item AASHTO T99 testing procedures shall be used
to determine the field density of the constructed embankment for the
following conditions with all results being reported to the City:
(1)
Embankment in place (cut section). Subgrade is to be scarified to a depth of six (6) inches below grade
for a distance of two (2) feet beyond the proposed edge of pavement
and compacted to a minimum of ninety-five percent (95%) maximum density.
The rate of density testing shall be a minimum of one (1) test per
five hundred (500) linear feet of roadway.
(2)
Borrow material (fill section). When embankment construction requires imported material, that material
shall be placed in lose lifts with a maximum thickness of eight (8)
inches and compacted to a minimum of ninety percent (90%) maximum
density to within eighteen (18) inches of top layer of subgrade which
shall require a minimum ninety-five percent (95%) maximum density.
Testing frequency shall be one (1) test per five hundred (500) linear
feet of roadway.
b.
Visual Inspection. When compaction of embankment
is a requirement of the contract but has not been specified as a pay
item the contractor shall distribute all equipment movements over
the entire embankment area. Prior to placement of aggregate sub-base
the City shall be contacted to visually observe proof-rolling operations
consisting, at a minimum, of a single-axle dump truck with a minimum
load of ten (10) cubic yards of crushed rock material. If any area(s)
are determined by the City to be substandard the City will be responsible
for delineating the extent of the substandard areas and the contractor
shall remove and replace all designated areas with suitable fill material
as determined by the City. Compactive efforts shall continue, if necessary,
until the City approves all areas of embankment.
c.
Prior to construction of street or alley pavements, adequate surface and subsurface drainage facilities, if required, are to be installed by the developer. Design requirements are found in Article VI. All drainage facilities shall be sized and specified by a professional engineer, registered in the State of Missouri.
B.
Roadway Sections. Typical roadway sections showing
various widths of roadway and right-of-way and required thickness
are as shown on Standard Drawing ST-1 included in these design standards.
Primary arterials are not included in these design standards since
such projects require individual study.
C.
Street Design. In the preparation of street design,
the following criteria must be observed. These controls are intended
to be the absolute minimum (or maximum) permitted. Any design not
meeting this requirement must have prior approval. Road classification
greater than those listed will require a special design to meet current
AASHTO Standards.
1.
Longitudinal grades - minimum one percent (1%) all classifications
- maximum:
|
Secondary Arterial
|
5%
| |
|
Collector
|
8%
| |
|
Local
|
10%
| |
|
Alleys
|
10%
| |
|
Cross Slope
|
1/4 inch per foot or 2% (typical)
|
2.
Vertical curves. The length of vertical curves
shall be no less than that determined by the formula:
|
L = KA, where:
| |
|
L = Length of vertical curve
| |
|
A = Algebraic difference in grades
| |
|
K = Determined by following table:
|
|
Table of "K" Value
|
Crest
|
Sag
| |
|
Secondary Arterial
|
80
|
70
| |
|
Collector (Non-Residential)
|
60
|
60
| |
|
Collector (Residential)
|
40
|
50
| |
|
Local (Non-Residential)
|
30
|
40
| |
|
Local (Residential)
|
20
|
30
| |
|
Alleys
|
10
|
20
|
3.
Minimum centerline radii (R) and Maximum superelevation (E):
|
Secondary Arterial
|
R = 600 feet
|
E = 0.04
| |
|
Collector (Residential and Non-Residential)
|
R = 400 feet
|
E = 0.03
| |
|
Local (Non-Residential)
|
R = 300 feet
|
E = 0.02
| |
|
Local (Residential)
|
R = 175 feet
|
E = 0.02
| |
|
Alleys
|
R = 175 feet
|
Inverted 6 inch Crown
| |
|
Minimum length of super-elevation runout = 100 feet
|
4.
Reverse curves/street jogs. Between reverse
curves on secondary arterial streets, there shall be a tangent of
not less than one hundred (100) feet. On collector and local streets
there shall be a tangent of not less than forty (40) feet. Street
jogs with centerline offsets less than one hundred twenty-five (125)
feet shall be avoided.
5.
Minimum curb radii at intersections:
|
Intersecting Residential Local and Collector
(feet)
|
Street Non-Residential Local and Collector
(feet)
| ||
|---|---|---|---|
|
Secondary Arterial
|
30
|
50
| |
|
Collector
|
20
|
30
| |
|
Local Residential
|
15
|
20
| |
|
Non-Residential
|
20
|
30
|
6.
Minimum safe stopping sight distance:
|
Secondary Arterial
|
500 feet
| |
|
Collector
|
300 feet
| |
|
Local Non-Residential
|
200 feet
| |
|
Local Residential
|
150 feet
|
7.
Minimum safe stopping distance at intersections:
|
Secondary Arterial
|
500 feet
| |
|
Collector
|
450 feet
| |
|
Local Non-Residential
|
300 feet
| |
|
Local Residential
|
250 feet
|
8.
Intersections. All curb returns shall be designed
with a wheel chair ramp meeting the requirements of Standard Drawings
ST-6 and ST-7. No drainage structures shall be allowed in the wheelchair
path. Intersections shall be approached on all sides by leveling areas.
Where the approach grade for either or both streets exceed three percent
(3%), the leveling area shall be a minimum length of one hundred (100)
feet measured from the intersection of the edge of gutter flag or
edge of road, within which no grade shall exceed a maximum of three
percent (3%) with a maximum crossfall of six (6) inches at the throat
of the radius returns of the intersecting street. Right angle intersections
shall be used whenever practicable. When local streets intersect collector
or arterial streets, the angle of intersection of the street centerlines
shall not be less than seventy-five degrees (75°). A diagonal
sight distance easement must be provided as shown Table VII-3, Right-of-Way
Triangle Requirements, on the property lines substantially parallel
to the chord of the curb radius.
9.
Elevations at street intersections shall be computed by extending
curb grades to the point of intersection (P.I.) of the intersection
of curbs. A minimum of three tenths (0.3) foot fall around a curb
return is required. Elevations at every ten (10) feet around the curb
return and centerline stationing at all radius points shall be shown
on the plan. All pavement stationing shall be shown using face of
curb data.
10.
Turnaround provisions. Dead-end street centerline
length shall not exceed one hundred fifty (150) feet without a turnaround
complying with Table VII-2 and VII-3.
11.
Temporary turnaround provisions. Except as
otherwise provided herein, temporary dead-end streets may be approved
where necessitated by the layout of the subdivision or staging of
development; provided that such temporary unpaved turnarounds shall
be constructed where lots are fronting on such temporary dead-end
street. The additional width of the right-of-way required for such
temporary turnaround shall be the same as that required for permanent
turnarounds. The extra right-of-way in excess of the street right-of-way
shall be vacated upon extension of the temporary street and the reconditioning
of said street and front yards concerned shall be at the expense of
the developer.
12.
Culs-de-sac. Information for the design of
culs-de-sac is shown on Standard Drawing ST-9.
13.
Expansion joints. Expansion joints in concrete
paving shall be placed as shown on Standard Drawing ST-5 at intersections
(unless otherwise shown on plans) and at all structures crossing the
roadway such as bridges, box culverts, etc. Expansion joints are required
around junction boxes, inlets, etc.
14.
Contraction joints. Contraction joints in concrete
paving shall be placed as shown on Standard Drawing ST-5 at intervals
of not more than twenty-five (25) feet and not more than twenty-five
(25) feet from any expansion joint. Contraction joints shall be without
dowels unless otherwise specified on plans.
15.
Longitudinal joints. Longitudinal joints shall
be placed meeting the requirements of Standard Drawing ST-5.
16.
Approaches to existing streets. All approaches
to existing curb and gutter streets shall be Portland cement concrete
to the radius points.
17.
Traffic circulation. Certain proposed streets,
where appropriate, shall be extended to the boundary of the tract
to be subdivided so as to provide for normal circulation of traffic
within the vicinity.
18.
Marginal access streets. Whenever the subdivision
contains or is adjacent to a railroad right-of-way or a highway designated
as a "Limited Access Highway" by the appropriate highway authorities,
provision shall be made for a marginal access street, or a parallel
street at a distance acceptable for the appropriate use of the land
between the highway or railroad and such streets.
D.
Street Plan Sheets.
1.
Plan. The following information shall be shown
on the plan portion of each plan sheet:
a.
Width of right-of-way.
b.
Width of pavement (back-of-curb to back-of-curb).
c.
Curb and right of way radii with elevation and stationing.
d.
Location and size of all existing utilities, meters, valves,
poles, street markers, signs, traffic signals, trees, shrubs, drainage
ditches, structures, storm sewers, easements, sanitary sewers and
manholes. This requirement to show existing utilities will not be
waived due to locations not being marked by the utility owner. The
plans must show existing utilities. The location of any proposed utilities
must also be shown.
e.
Other information. Central angle, centerline
radius, arc length, and tangent distance of horizontal curves. Stationing
of beginning and end of paving, PC and PT stationing of curves and
ties to lot corners. All lot dimensions.
f.
Grading. Both existing and proposed contours
shall be shown on the plan sheets along with the limits of proposed
grading.
2.
Profile. The following information shall be
shown on the profile portion of each plan sheet:
a.
Existing ground lines at centerlines lines with elevations shown
at fifty (50) foot intervals.
b.
Proposed centerline grades. Grades shown in
percent (%).
c.
Centerline elevation and stationing labeled at fifty (50) foot
intervals.
d.
Vertical curve information. PI, PT, PC, k value,
length, radius, hi/low point elevation and stationing shall be labeled.
e.
Cross street intersections. Where a cross street
intersects the name, station and elevation shall be labeled.
f.
Beginning and ending stationing.
g.
Underground utilities. When possible all underground
utilities that cross the centerline are to be shown and labeled with
type, size and elevation.
4.
Manholes. Manhole designation and elevation
of top of manhole must be given when located within right-of-way.
5.
Storm sewers. Flow line elevations must be
given for storm sewers within right-of-way.
E.
Additional Requirements. See the City of Farmington, Missouri, General Conditions and Technical Specifications for Public Improvements and Chapter 410 of the Farmington City Code for additional requirements.
F.
Changes During Construction. All construction shall
be completed in accordance with the approved project plans and specifications.
If changes are necessary during construction, written approval from
the Public Works Director shall be secured prior to the execution
of such changes.
|
TABLE VII-2
| |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Street Cross Section Standards City of Farmington
| |||||||||||
|
Commercial or Industrial Development
| |||||||||||
|
Street Type
|
Cross Section Widths*
(feet)
|
Street Width
(width)
(see note 5)
|
B.O.C. Width
(feet)
|
Number of Lanes
|
Lane Width
(feet)
|
Parking
|
Right-of-Way Width
(feet)
| ||||
|
1
|
2
|
3
|
4
|
1-Side
|
2-Side
| ||||||
|
Primary Arterial
|
1.5
|
5
|
6
|
30
|
60
|
65
|
5
|
12
|
N.A.
|
N.A.
|
90
|
|
2.5
|
5
|
6
|
24
|
48
|
53
|
4
|
12
|
N.A.
|
N.A.
|
80
| |
|
Secondary Arterial
|
2
|
5
|
4
|
24
|
48
|
53
|
4
|
12
|
N.A.
|
N.A.
|
75
|
|
3
|
5
|
4
|
18
|
36
|
41
|
3
|
12
|
N.A.
|
N.A.
|
65
| |
|
1.5
|
5
|
4
|
12
|
24
|
29
|
2
|
12
|
N.A.
|
N.A.
|
50
| |
|
Collector and Local (Non-Residential)
|
2
|
5
|
2
|
26
|
52
|
57
|
3
|
12
|
—
|
8 feet
|
75
|
|
2 to-6
|
5
|
2
|
22 to 26
|
44
|
49
|
3
|
12
|
8 feet
|
—
|
75
| |
|
2.5
|
5
|
2
|
18
|
36
|
41
|
3
|
12
|
—
|
—
|
60
| |
|
3
|
5
|
2
|
20
|
40
|
45
|
2
|
12
|
—
|
8 feet
|
65
| |
|
3 to-7
|
5
|
2
|
16 to-20
|
32
|
37
|
2
|
12
|
8 feet
|
—
|
65
| |
|
3.5
|
5
|
2
|
12
|
24
|
29
|
2
|
12
|
—
|
—
|
50
| |
|
Local (Residential-see notes 3 and 4)
|
1.5
|
5
|
2
|
16.5
|
33
|
38
|
—
|
—
|
—
|
YES
|
55
|
|
1.5
|
5
|
2
|
14
|
28
|
33
|
—
|
—
|
YES
|
—
|
50
| |
|
3.5
|
5
|
2
|
12
|
24
|
29
|
2
|
12
|
—
|
—
|
50
| |
|
Alley
|
—
|
—
|
—
|
—
|
22
|
22
|
2
|
11
|
—
|
—
|
24
|
|
*
|
Refer to Figure VII — 1
|
|
Notes:
| |
|
1.
|
The dimensions of cross section components 1, 2, 3
may vary to suit local or specific conditions, but in no instance
shall dimension 2 be less than 4 feet.
|
|
2.
|
On street where parking is permitted, it shall be regulated
at intersections to comply with sight distance requirements.
|
|
3.
|
Parking will be permitted on both sides of local residential
streets, but full 12 foot lanes and 8 foot parking stripes are not
required due to low traffic volume.
|
|
4.
|
Two lane local residential streets to be approved by
Public Works Director.
|
|
5.
|
Street width dimension does not include width of curb
and gutter.
|
|
FIGURE VII-1
STANDARD ROAD SECTION WITH CURB AND GUTTER
 |
|
TABLE VII-3
| ||||||
|---|---|---|---|---|---|---|
|
Right-of-Way Triangle Requirements City of Farmington
| ||||||
|
Intersection of/
With
|
Major Arterial
|
Secondary Arterial
|
Non-Residential Collector
|
Residential Collector
|
Non-Residential Local
|
Residential Local
|
|
Major Arterial
|
A
|
A
|
B
|
B
|
B
|
C
|
|
Secondary Arterial
|
A
|
B
|
B
|
C
|
C
|
D
|
|
Collector
|
B
|
B
|
C
|
C
|
C
|
D
|
|
Residential Collector
|
B
|
C
|
C
|
C
|
C
|
D
|
|
Non-Residential Local
|
B
|
C
|
C
|
C
|
C
|
D
|
|
Residential
|
C
|
D
|
D
|
D
|
D
|
E
|
|
KEY: A - 100 feet X 100 feet ROW triangle w/separate
right turn lanes
|
|
B - 30 feet X 30 feet ROW triangle w/50 feet corner
radii
|
|
C - 10 feet X 10 feet ROW triangle w/30 feet corner
radii (or 15 feet ROW radius)
|
|
D - 10 feet X 10 feet ROW triangle w/20 feet corner
radii (or 15 feet ROW radius)
|
