Street reconstruction standards shall be applicable to work
performed by the Board of Public Works or any other entity performing
reconstruction on City streets within the City of Lewes under the
direction of the General Manager or City Manager or their designated
representative:
A. Arrangement. Streets shall be arranged to conform to the arrangement
of existing streets and shall be connected with such existing roads
and highways as to form continuation thereof.
B. Conformance to topography. Streets shall conform to existing topographical
conditions.
C. Grade and alignment.
(1) Grade and alignment shall match, or exceed, existing conditions.
D. Design standards.
(1) The design of the pavement sections for streets shall be based upon
the type of soils, the anticipated number of dwelling units utilizing
the streets and/or the Commercial/Industrial Class, and the utilization
of the streets by construction traffic.
(2) "Good soil" shall be defined as all soil within the A-1, A-2 and
A-3 AASHTO soil classifications. "Poor soil" shall be defined as all
soil within the A-4, A-5, A-6 and A-7 soil classification.
(3) For pavement design using good soil conditions, a soil investigation
program shall be required.
(4) A soil investigation program will not be required if the pavement
sections are designed using the poor soil conditions.
(5) Surface treatment pavement shall not be permitted.
(6) All streets shall have a minimum of three inches of hot mix. For
streets serving over 200 dwelling units and/or having a commercial/industrial
classification of D or E, a minimum of four inches of hot mix shall
be required. Hot mix shall only be applied over graded aggregate base,
and never directly over select borrow.
(7) A minimum of four inches of premixed (CR-1) or six inches of crusher
run shall be used for the base course.
(8) The minimum required structural number shall be as follows:
[Amended at time of adoption of Code (see Ch. 1, General
Provisions, Art. II)]
|
Commercial/ *Industrial Class
|
Dwelling Units
|
Good Soil
|
Poor Soil
|
---|
|
A
|
1 to 25
|
2.20
|
2.80
|
|
B
|
26 to 50
|
2.50
|
3.20
|
|
C
|
51 to 100
|
2.80
|
3.50
|
|
D
|
101 to 200
|
3.20
|
4.00
|
|
E
|
201 to 300
|
3.60
|
4.40
|
*NOTE: Class E requires a detailed pavement design.
|
(a)
Commercial/industrial classes.
[1]
Class A, Traffic volume less than 50 ADT:
[a] Local truck delivery only.
[2]
Class B, Traffic volume 50 to 500 ADT; and/or:
[a] Local truck delivery only.
[3]
Class C, Traffic volume 500 to 2,000 ADT; and/or:
[a] Less than 15 trucks per day (not including local
delivery).
[4]
Class D, Traffic volume 2,000 to 5,000 ADT; and/or:
[a] Less than 50 trucks per day (not including local
delivery).
[5]
Class E, Traffic volume in excess of 5,000 ADT; and/or:
[a] Over 50 trucks per day (not including local delivery).
(b)
On a mixed-use street (commercial/industrial and dwelling units),
the more stringent structural number shall be required.
(9) The structural numbers of the individual materials to be used in
the construction of the pavement section shall be per the following
tabulation, as required by the specifications of the Department of
Transportation of the State of Delaware, as the same may be from time
to time amended. Undisturbed subgrade cannot be counted in structural
number calculations.
|
Tabulation of Structural Numbers
|
---|
|
Use
|
Material
|
Structural Number for Inch Thickness
|
---|
|
Surface course
|
Type C hot mix
|
0.40
|
|
Binder course
|
Type A hot mix
|
0.35
|
|
|
Type B hot mix
|
0.40
|
|
Base course
|
Select borrow
|
0.08
|
|
|
Quarry waste
|
0.11
|
|
|
Graded aggregate
|
0.14
|
|
|
Soil cement (6% cement +1%)
|
0.20
|
|
|
Bituminous concrete
|
0.32
|
(10)
All curbs and gutters shall be left open so as not to obstruct
the free passage of water, and the sidewalks and footways must be
kept in a safe and passable condition, to the extent possible. Construction
and details of sidewalks, curbs and gutters are governed by the appropriate
sections of the latest edition of the Specification of the Department
of Transportation of the State of Delaware and the Americans with
Disabilities Handbook. Restoration of curb, gutter and sidewalk shall
be done in whole sections (joint to joint). Restoration of curb, gutter
and sidewalk at less than whole sections shall not be permitted.
(11)
Installations shall be completed to maintain proper storm drainage
flows during, and after, the course of work, and any costs due to
water damage from the work shall be the responsibility of the installing
party.
(12)
All standards as set forth in these street reconstruction standards
are the minimum acceptable and should be exceeded as necessary to
address the specific requirements of the restored street.