2 Del. Admin. Code § 4.3

Current through Register Vol. 28, No. 5, November 1, 2024

Section 4.3 - SUBDIVISION CONSTRUCTION PLAN SUBMITTAL REQUIREMENTS

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

4.3.1Subdivision 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.

4.3.2Subdivision 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

4.3.3Subdivision 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

4.3.4Subdivision 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.shtml

4.3.5Subdivision 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
Structure	Box	Top Unit	Grate	T.G. Elev.	Invert In	Invert In	Invert In	Invert Out

Figure 4.3.5-c Storm Drainage Pipe Schedule

Pipe	Description							Invert Elevation
Pipe	From	To	Size	Type	Length	Class	Slope (%)	In	Out

4.3.6Subdivision 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

4.3.7Subdivision 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

4.3.8Subdivision 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.

4.3.9Subdivision 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.

4.3.10Subdivision 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

2 Del. Admin. Code § 4.3

13 DE Reg. 1101 (02/01/10)
15 DE Reg. 551 (10/01/11)
16 DE Reg. 1199 (5/1/2013)
18 DE Reg. 240 (9/1/2014)
18 DE Reg. 709 (3/1/2015)
19 DE Reg. 73 (7/1/2015)
19 DE Reg. 938 (4/1/2016) (Final)