[Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. IV)]
All streets within all subdivisions, whether to be dedicated for public use or for private access to Planned Developments as herein defined, shall be improved with a durable hard surfaced roadway in accordance with the following.
A. 
Base course and surface course. Base courses and surface courses shall conform to the requirements set forth on the Village of Dwight Standard Detail Sheet.
B. 
Standards for construction.
(1) 
Materials and methods of construction shall be in compliance with the Illinois Standard Specifications for Road and Bridge Construction, latest edition.
(2) 
When a street shall cross a creek, the crossing shall be constructed with reinforced concrete or multi-plate arch structure and the size shall be determined by the Village Engineer.
(3) 
The ends of said structure shall have a headwall and wing walls. The slope from the street right-of-way to the end of the headwall shall be a 2:1 ratio.
(4) 
There shall be a guardrail placed at each crossing, and landscaped.
C. 
Street improvements.
(1) 
The full width of the right-of-way shall be graded to the required section.
(2) 
All unsuitable subbase material shall be removed and shall be replaced with stable, compacted material in conformance with generally accepted engineering practices.
(3) 
The center line grade shall be not less than 4%, and shall not exceed 5% on major and collector streets and 10% on minor streets and cul-de-sac streets.
(4) 
Vertical curves shall be used whenever a change in center line gradient occurs, except where the algebraic difference in gradients is 1% or less. The length of vertical curve on minor streets shall be 40 feet for each 1% of algebraic difference of grade, but in no case shall such length be less than 40 feet. The length of vertical curve on collector streets shall be 50 feet for each 1% of algebraic difference of grade, but in no case shall such length be less than 50 feet.
(5) 
All pavements shall be designed in accordance with the "Manual of Instructions for the Structural Design of Bituminous Pavements" or the "Manual for the Structural Design of Portland Cement Concrete Pavements," in Illinois, by the Illinois Department of Transportation (IDOT), latest edition. The minimum thickness shall be as hereinafter set forth. Design data shall be submitted to the Village with IBR tests and shall provide structural numbers as set forth in the aforementioned manuals as follows:
Minimum
Frontage Roads
Dt
2.0
Minor Connecting Roads
Dt
2.5
Major Connecting Roads
Dt
3.5
Business and Commercial Streets
Dt
3.5
Industrial Streets
Dt
3.5
Combination curb and gutter shall be constructed on all streets using the type, style and size as set forth within the Ordinance and Standards of the Village. All driveways from the street to the property line shall be constructed of concrete or asphalt according to the structural requirements for frontage roads as set forth in § 250-11.00C(5) of the Dwight Subdivision Ordinance.
A. 
The complete design for frontage roads, including specifications and designation of trafficways driving widths, thickness, materials, etc., shall be submitted to the Plan Commission for review and approval prior to the issuance of building permits or the sale or lease of buildings or land in Planned Developments as defined in this chapter. The minimum number of off-street parking spaces shall be in accordance with the requirements of the Zoning Ordinance of the Village of Dwight. Frontage roads and parking areas shall be designed in accordance with § 250-11.00C(5).
B. 
When a frontage road is to be dedicated to public use, the specifications shall be in accordance with the minimum width, thickness and standards of the Village of Dwight. Where more than one owner or lessee are to use the same private frontage road or parking lot, a trust indenture shall be recorded before approval of the multifamily, commercial or industrial subdivision as defined herein.
C. 
A minimum distance may be required by the Commission where deemed necessary between points of ingress and egress where all property to be subdivided is under one ownership on the effective date of this chapter. Where property has frontage on a State or Federal highway, the spacing and design of the points of ingress and egress to the major highway shall be subject to approval of the Illinois Department of Transportation.
Sidewalks shall be constructed of Portland Cement concrete, to a thickness of four inches. Concrete for such sidewalks shall have a minimum twenty-eight-day compressive strength of 4,000 pounds and shall contain not less than 3% nor more than 6% entrained air. Slump shall be not less than two inches nor more than four inches.
Streetlighting improvements shall be installed to service all property to be developed. Each corner of a street intersection and cul-de-sac shall be improved with a light standard with a maximum spacing of 350 feet.
Four complete sets of engineering plans and specifications of required land improvement as regulated by § 250-8.08A(1), together with an estimate of the cost of improvements, said plans and specifications to bear the seal of an Illinois registered professional engineer along with his signed statement that such plans and specifications have been prepared in compliance with this chapter and with good engineering practice. Said plans shall be drawn to a minimum horizontal scale of 50 feet to the inch and minimum vertical scale of five feet to the inch. Plans shall show profiles of all utility and street improvements, with elevations referred to United States Geological Survey datum.
Upon the completion of construction of all public improvements required by this chapter, in conformance with approved engineering plans and specifications, the Design Engineer engaged by the subdivider, builder or land developer shall prepare and submit to the Village Clerk four sets of as-built of plans and certification by Village Engineer that all public improvements have been satisfactorily completed in accordance with the approved engineering plans and specifications. The Village Board will enact a resolution accepting said improvements.
A. 
Prohibited trees. The planting of the following varieties of trees within public rights-of-way shall be prohibited:
Soft Maple
(Acer disycarpum)
In variety
Poplar
(Populus)
All varieties
Willow
(Salix)
All varieties
Box Elder
(Acer negundo)
All varieties
Catalpa
(Catalpa)
All varieties
Tree of Heaven
(Ailanthus)
All varieties
Mountain Ash
(Sorbus)
All varieties
Mulberry
(Morus Alba)
In variety
Chines Elm
(Ulmis Parvifulia)
All varieties
B. 
Screen planting required. Protective screen planting may be required to secure a reasonably diverse effective physical barrier between residential properties and adjoining uses to minimize a conditions of sight and sound. The screen planting plan shall meet the approval of the Plan Commission and corner lots must follow § 310-4.06F of Chapter 310, Zoning, of the Code of the Village of Dwight for set back clearance.
No blasting shall take place in connection with any work in a subdivision until appropriate Village authorities have been notified and the applicable Village ordinances complied with.
Iron pipe or steel bars not less than 1/2 inch in diameter and 24 inches long shall be set at all corners of lots and all street point of tangents and point of curve. Markers shall be set level with the finished grade. The subdivider shall replace all or verify the existence of the iron pipes at all lot corners and all bends in property in property lines after the completion of all construction and before final acceptance of the subdivision by the Village Board of Trustees.
Retention ponds or reservoirs may be constructed. Such retention facilities shall be designed to retain a certain water level at all times and may, in addition to serving as part of the stormwater drainage system of the Village of Dwight, be used for scenic and recreation purposes. Detailed engineering plans and specifications for retention or detention facilities shall be in prepared by the design engineer for review by the Village Engineer and Plan Commission and approved by the Village Board. The design of retention or detention facilities shall be in accordance with the following guidelines:
A. 
There must not be any pollution of any kind entering the water area during or after construction.
B. 
Access. No less than two access drives into area from opposite directions, paved from curb to sidewalk.
C. 
An emergency overflow shall be constructed at all ponds.
D. 
When possible, a mechanical drain shall be constructed with the outlet pipe at the lowest possible elevation and connected to the storm sewer.
E. 
A mechanical control gate shall be used at the outlet pipe.
F. 
The ends of all incoming storm sewer lines shall be above the normal pool elevation and shall be set in a concrete headwall or end section.
G. 
Retention ponds of less than three acres at normal water elevation are not permitted.
H. 
Depth of pool at normal elevation shall be not less than 10 feet over a minimum of 30% of the pool.
I. 
The bottom slope of the pool shall be four to one from the maximum flood stage elevation to a point 20 feet out from the normal pool elevation.
J. 
The entire area shall be graded and seeded and the soil shall be stable enough to support mowing equipment and landscaped. Minimum five trees per acre of 2 1/2 inch diameter.
K. 
The distance from the normal pool elevation to the near less than 100 feet.
L. 
At flood stage, the water shall be not closer than 50 feet to the nearest lot line.
M. 
Areas shall be under the direction of the Park and Recreation Committee after approval by the Village of the units in which they are constructed. Storm drainage control shall be retained by the Village.
N. 
Dams and constructed walls. All dams and constructed walls shall be designed by a registered engineer and, if of earth, shall have a maximum slope of 2.5 to 1, be constructed of compacted clean earth fill, and have an interior core wall of concrete on sheet steel.
O. 
Embankments. Shaped earth embankments shall have a maximum slope of three to one and shall be compacted to remove all voids exposed by cutting and shall be cleared of all extraneous material and foliage below the designed water line.
P. 
Depth. Retention facilities shall maintain a minimum constant water depth of 10 feet over 30% of the surface water area, in addition to the depth of occasional water detained in the facility in storm situations.
Q. 
Area. Retention facilities smaller in area than three acres shall not be permitted. Such area shall be measured of the constant water level.
R. 
Overflow outlets. Overflow outlets shall be provided as necessary to keep the water level within a retention facility within its design limits. Materials and methods of construction for overflow piping shall be the same as for storm sewer construction as shown in § 250-10.02 of this chapter. Maximum overflow rate shall be designed in accordance with § 250-10.02 of this chapter. Overflow spillways shall be of concrete and so constructed that no erosion of the dam or outfall shall occur.
S. 
Overflow outfalls. Overflow outfalls shall be as specified in § 250-10.02 of this chapter for storm drainage outfalls.
T. 
Bank stabilization and landscaping. All cut embankments, earth dams, or other earth surfaces shall be seeded or sodded, in accordance with § 250-11.10 of this chapter, to the designed occasional water level of the retention facility. From this point to the constant water level, sand or gravel may be used. Stabilization with stone, concrete, or other material may be used if specifically approved by the Village Board. Trees shall not be planted on or within 20 feet of any earth dam.
A. 
Inspection required. All grading, paving, landscaping, or other surface improvements as required by this chapter shall be inspected during the course of construction and upon completion by the Village Engineer and by the Public Works Department of the Village of Dwight.
B. 
Notification required. During the course of construction of the improvements, the subdivider shall notify the Village 48 hours before any required inspection.