Current through Register Vol. 28, No. 3, September 1, 2024
This section applies to the requirements for state
maintained subdivision streets.
Any project submitted to DelDOT for review must contain
all elements listed in this section and in accordance with the Gatekeeping
Checklist, available online at http://devcoord.deldot.gov <
Checklists. When a project is submitted for review, the submission will be
checked to ensure that all required elements are on the plan and all necessary
documents are included. If any elements are not relevant to the particular site
then these elements shall be specified in the submittal letter or on the
checklist. Incomplete submissions will be returned to the engineer for
resubmission with no comments provided by DelDOT.
The subdivision construction plans shall be prepared in
accordance with the requirements provided in this manual. The following
elements are supplemental information required by DelDOT to be addressed and/or
included on the construction plans. Failure to submit completed required
documents will result in delays reviewing and approving submittals and/or
declining the submission.
A. Completed
Entrance Plan/Construction Plan Gatekeeping Checklist (for more information go
to http://devcoord.deldot.gov
> Checklists)
B. Completed
Design Criteria form (for more information go to
http://devcoord.deldot.gov >
Forms)
C. Completed Checklist for
Subdivision Plan Approval (for more information go to
http://devcoord.deldot.gov >
Checklists)
D. Construction Stage
Fee Calculation Form and associated fee (for more information go to
http://devcoord.deldot.gov >
Forms)
E. Entrance plan meeting the
requirements of Section 4.3.7
F.
Sight distance triangles with supporting calculations and Intersection Sight
Distance spreadsheet found on DelDOTs website at
http://devcoord.deldot.gov>
Forms & >Guidance)
G. Layout
of required auxiliary lanes and bike and pedestrian facilities with supporting
documentation and left and right turn lane spreadsheets. Auxiliary lane
worksheet and typical entrance diagrams are available on DelDOT's website
at:http://devcoord.deldot.gov
> Forms & > Guidance
H. A
digital copy of back-up calculations for design elements outlined in Chapter 5
(i.e. entrance design, sight distance triangles, typical section elements,
pavement design, drainage design, and signing and striping) and a complete set
of stormwater and sediment/erosion control drawings must be submitted for
review with the plans
4.3.1
Subdivision Construction Plan Submittal Requirements - General
Guidelines
The following items are required by DelDOT for
Subdivision Construction Plan submittals:
A. The plan sheet size shall be 24" x 36" or
22"x36". Plan sheets of other sizes shall be returned without review.
B. Drafting work shall be neat, legible and
reflect locations of existing and proposed features based on actual field
surveys. All text height shall be 0.1 times the scale of the plan sheet. All
text shall be legible when plans are produced at half size. Existing and
proposed text and linestyles shall be distinguishable from each
other.
C. Construction plans shall
be drawn to a scale of 1" = 30'. In certain cases where clarity of plans can be
maintained, a scale of 1" = 50' may be allowed at DelDOT's
discretion.
D. Drainage system
calculations for: total drainage area, total impervious area, peak
discharge,
E. Open and closed
drainage systems, drainage spread on roadways, stormwater management, outfalls,
etc.
4.3.2
Subdivision Construction Plan Submittal Requirements - Title Sheet
A title sheet shall include the following:
A. DelDOT project ID number (provided by
DelDOT)
B. Name of
subdivision
C. Section of the
subdivision or name of the streets to be considered by this plan
D. Identification of subdivision streets as
public or private (see Section 3.2.2)
E. General Location map showing the
relationship of the site to existing state-maintained roadways. The location
map shall be drawn to a scale of no less than 1 inch = 1 mile.
F. County in which subdivision is
located
G. Total sheets in
subdivision street construction plan
H. Plan view of entire subdivision indicating
streets to be constructed in accordance with this plan and their relation to
all other streets within the subdivision. Show north arrow for
reference
I. General Notes (
http://devcoord.deldot.gov > Quick
Links > DelDOT Notes)
J. Index of
sheets
K. Legend for existing and
proposed features (symbols, line types, etc.)
L. Signature block:
1. Seal of individual properly licensed in
Delaware to perform the engineering and design for the preparation of
construction plans for subdivision streets
2. Signature of engineer and date
See Figure 4.3.2-a for a sample title sheet provided as
general guidance.
Figure 4.3.2-a Sample Subdivision Title
Sheet
Click here
to view
4.3.3
Subdivision Construction Plan
Submittal Requirements - Typical Section Sheets
Typical section sheets are required as part of
subdivision construction plans. They are required for each major change of
section and shall include the following:
A. Typical street sections for internal
streets and frontage roads:
1. Existing and
proposed widths of streets, lanes, shoulders, right-of-way and
easements
2. Existing and proposed
cross slopes of all lanes, shoulders and swales
3. Slope of roadside embankment (front slope
and back slope)
4. Clear zone width
and horizontal clearance
5.
Proposed limit of construction
6.
Point-of-Profile Grade Application and Point-of-Ditch Grade
Application
7. Type of
curb
8. Depth and type of pavement
material
9. Locations to place
topsoil, seed and mulch
10.
Location of underdrains
11.
Subgrade to be prepared in accordance with DelDOT Standard
Specifications
B. Non-Roadside Ditches/Swales:
1. Width of ditch bottom
2. Point-of-Profile Grade Application
(Ditches longer than 100 feet require a profile)
3. Side slopes
4. Type and depth of ditch
protection
5. Locations to place
topsoil, seed, and mulch
6.
Existing and proposed easements
4.3.4
Subdivision Construction Plan
Submittal Requirements - Detail Sheets
Detail sheets shall provide information to the contractor
on construction that is not included in the Standard Construction
Details, and shall include the following:
A. Special Details:
1. Intersection roads
2. Super-elevation diagrams (when
required)
3. Bridges
4. Details of non-standard drainage
structures
5. Pavement
section(s)
B.
Intersection Details (at 1"=10'):
1.
Intersection radii with stations and offsets to curve points
2. Location by station and offset to
islands
3. Grade elevations at edge
of pavement at maximum interval of 25 feet on edge of pavement and 10 feet on
intersection radii
4. Curb ramps
and drainage inlets
C.
Plan sheet index (separate sheet) for plan sets containing 5 or more
Construction Plan sheets:
1. Sheet
numbers
2. Total sheets
3. Streets
4. Street names For general guidance on index
setup, refer to DelDOT's Model Plans at:
http://www.deldot.gov/information/business/drc/modelplans.shtml4.3.5
Subdivision Construction Plan
Submittal Requirements - Plan Sheet
Plan sheets shall include the following:
A. General Plan Criteria:
1. Limits of construction
2. North arrow on each plan sheet
3. Right-of-way line, existing and proposed
(dimensioned in accordance with Fig. 3.2.5-a)
4. Right-of-way monuments
5. Street names
B. Horizontal and vertical control data:
1. Benchmarks: Maximum spacing is 1,000 feet.
Show elevation and location. Use NAVD 88
2. Centerline stationing and curve data (both
horizontal and vertical)
3. Survey
references to horizontal control points
4. Bearings of centerline tangents
5. Station equations of intersecting road
baselines
C. Topography:
1. Topography shall extend beyond the limits
of the property to include the proposed positive drainage outfall, critical
features of the existing highway for a minimum distance beyond the proposed
entrance location as specified in Figures 3.4.2-b, 3.4.2-c, and
3.4.2-d.
2. Contours showing the
elevation of the existing ground within the limits of the topographic survey.
The contour interval for various ground slopes shall be as follows:
Figure 4.3.5-a Contour Interval for Various
Ground Slopes
|
Average Ground Slope
|
Contour Interval
|
|
Less than 0.5%
|
1.0 feet with spot grades
|
|
0.5% to 5.0%
|
1.0 feet
|
|
Over 5%
|
2.0 feet
|
D. Lot layout within the site showing
relationship of lots to the proposed internal street system
E. Utilities:
Location of all existing and proposed sanitary sewer and
water lines. A separate set of utility plan sheets may be required depending on
the complexity of the plan sheet.
F. Drainage:
1. Location and elevations of parallel
ditches every 50 feet
2. Location
and type of ditch protection other than seed and mulch
3. Drainage flow arrows on pipes,
underdrains, and ditches
4.
Identify and locate drainage structures, storm sewers, and culverts with
specific symbols
5. Location, flow
line, elevation, typical section and ditch protection for culvert or storm
sewer outfall
6. Pipe and drainage
structures schedule shall be included on each plan sheet. These schedules shall
list the structure ID, type, invert, and top elevation, pipe ID, size, length,
invert elevations, slopes and type. See Figures 4.3.5-b and 4.3.5-c for storm
drainage structure and pipe schedule.
7. Pipe angles shall be listed in the
schedule and shall not exceed the maximum values allowable for the drainage
devices used. Acceptable pipe angles have been derived and listed in the pipe
cover/angle spreadsheet available online at
http://devcoord.deldot.gov >
Forms
8. Drainage easements, shown
in accordance with Section 5.7.2.6
G. Construction plans shall be at a scale of
r'=30'. Enlargements may be needed to show additional details.
Figure 4.3.5-b Storm Drainage Structure
Schedule
|
Structure
|
Description
|
T.G.
Elev.
|
Invert In
|
Invert In
|
Invert In
|
Invert Out
|
|
Box
|
Top Unit
|
Grate
|
Figure 4.3.5-c Storm Drainage Pipe
Schedule
|
Pipe
|
Description
|
Invert Elevation
|
|
From
|
To
|
Size
|
Type
|
Length
|
Class
|
Slope
(%)
|
In
|
Out
|
4.3.6
Subdivision Construction Plan
Submittal Requirements - Profile Sheet
Profiles shall be on same sheet as plan views, where
possible. Profiles shall include the following:
A. Horizontal scale (shall be same as plan
sheet)
B. Vertical scale (shall
generally be 1" = 5')
C. Vertical
Curve Data: PVC, PVI, PVT, length of curve, PVI Elevation, K value
D. Soil boring information (when available) -
Use exaggerated scale and indicate type and depth of material
E. Drainage features - Identify drainage
features with pipe or structure symbols that matches schedule
F. Existing and proposed utilities
G. Existing and proposed elevations every 50'
at minimum
H. Longitudinal grades
(%)
For general guidance on profile sheet setup, refer to
DelDOT's Model Plans at:
http://www.deldot.gov/information/business/drc/modelplans.shtml
4.3.7
Subdivision Construction Plan
Submittal Requirements - Entrance Plan Sheet
Entrance plans shall include the following:
A. Existing and proposed right-of-way,
property lines and easements.
B
Names and parcel information of abutting land owners.
C Existing and proposed pavement edges and
material types.
D Existing and
proposed utilities including all DelDOT infrastructure.
E Contours showing the elevation of the
existing ground within the limits of the topographic survey. The contour
interval for various ground slopes shall be shown in accordance with Figure
4.3.5-a. Topography shall extend to the limits as defined in Section
4.3.5-C.
F. Proposed
contours
G. Location of any
crossovers
H. Roadway
curves
I. Existing and proposed
entrances serving the adjacent properties on both sides of the road
J. Proposed sight distance
easements
K. Existing and proposed
drainage features
L. Location of
existing and proposed buildings
M.
Existing and proposed utility poles, signs, etc
N. Parking layout
O. Proposed entrance geometry, including
entrance radii dimensions
P.
Centerline stationing for the frontage road(s)
Q. Proposed curb and sidewalk
grades
R. At a proposed entrance
that requires widening to the existing State-maintained roadway, spot
elevations on the proposed edge of pavement and where the proposed pavement
meets the existing pavement shall be provided at 25-foot intervals. Spot
elevations at the entrance radii shall be given at 10-foot intervals
S. Site specific entrance construction
details. (A separate plan sheet may be required for details.) DelDOT standard
details shall not be shown on plans
T. Proposed limit of construction
U. Traffic Generation Diagram (for more
information, see Figure 3.4.2-a and DelDOT's
Traffic Generation Example
which is available online at
http://devcoord.deldot.gov> Guidance), showing the following:
1. Site generated ADT and distribution (per
the latest edition of the ITE Trip Generation Manual)
2. Mainline ADT (existing and projected) and
speed limit
V. Signing and
striping plan with existing and proposed striping, including lane widths. A
separate plan view or sheet may be required.
W. Existing traffic infrastructure, devices
and systems including but not limited to signal and pedestrian poles, junction
wells, inductive loops, cameras, conduit, weather equipment, pedestrian
signals, cabinets and red light cameras
X. North arrow and Graphic scale (1" = 30'
preferred, 1" = 20' acceptable)
Y.
Typical sections as defined in Section 4.3.3
Z. Existing/Proposed transit facilities,
pedestrian and shared-use pathways, pedestrian crossings and bicycle
facilities
4.3.8
Subdivision Construction Plan Submittal Requirements - Maintenance of
Traffic Sheet
A MOT plan must be prepared for all projects that have an
impact to an active roadway. Depending on the complexity of the project, the
plan may range from a short narrative on the plans referencing the MOT Typical
Application in the DE MUTCD to a series of sheets detailing the traffic control
measures for phased construction. Applicable MOT General Notes shall be placed
on the plan. See http://devcoord.deldot.gov > Quick
Links > DelDOT Notes for General Notes for MOT.
4.3.9
Subdivision Construction Plan
Submittal Requirements - Signal Plans
Signal plans may be required. Digital files shall be
provided to DelDOT. Refer to Section 5.13 for more information on signal
design.
4.3.10
Subdivision Construction Plan Submittal Requirements - Cross Section
Sheets
Where subdivision construction plans include proposed
improvements to frontage roads, cross sections shall be required. Cross
sections shall be shown along the frontage road every 50 feet at even stations
(e.g. 1+00, 1+50, etc.) and at critical and transition locations within the
limits of improvements. Cross sections shall show the following
information:
A. Existing and proposed
widths of streets, lanes, shoulders, right-of-way and easements
B. Existing and proposed cross slopes of all
lanes, shoulders and swales
C. Slope
of roadside embankment (front slope and back slope)
D. Clear zone width and horizontal
clearance
E. Proposed limit of
construction
F. Point-of-Profile
Grade Application
G. Existing and
proposed curb, including curb type(s)
H. Depth and type of pavement
material
I. Locations to place
topsoil, seed and mulch
J. Location
of underdrains
K. All existing and
proposed drainage structures and utilities
