All streets within all subdivisions, as defined in section 6-4-2 of this title, shall be improved with a durable hard surfaced roadway in accordance with the following: (Ord. 99-O-791, 6-7-1999)
A. Base Course And Surface Course: The subdivider shall install the required street improvements utilizing one of the following alternatives:
1. The base course shall include a minimum of four inches (4") of crushed stone (CA-6, grade 8 or 9), four inches (4") of stabilized base course (BAM or MS = 1700), two inches (2") of binder, area reflective crack control treatment, and two inches (2") of class I surface; or
2. The base course shall consist of a nonwoven geotextile fabric (minimum grab tensile strength of 215 pounds and a Mullen burst of 360 pounds per square inch), twelve inches (12") of crushed stone (CA-6, grade 8 or 9), two inches (2") of binder, area reflective crack control treatment, and two inches (2") of class I surface.
Curb and gutter shall be installed. (Ord. 03-O-883, 8-4-2003)
B. Standards For Construction: Materials and methods of construction shall be in compliance with the Illinois "Standard Specifications For Road And Bridge Construction", latest edition.
C. Street Improvements:
1. The full width of the right of way shall be graded to the required section.
2. The unsuitable subbase material shall be removed and shall be replaced with stable, compacted material in conformance with generally accepted engineering practices.
3. The centerline grade shall be not less than five-tenths of one percent (0.5%), and shall not exceed five percent (5%) on major and collector streets and six percent (6%) on minor streets and cul-de-sac streets or as determined by the village engineer.
4. Vertical curves shall be used whenever a change in centerline gradient occurs, except where the algebraic difference in gradients is one percent (1%) or less. The length of vertical curve on minor streets shall be forty feet (40') for each one percent (1%) of algebraic difference of grade, but in no case shall such length be less than forty feet (40'). The length of vertical curve on collector streets shall be fifty feet (50') for each one percent (1%) of algebraic difference of grade, but in no case shall such length be less than fifty feet (50').
5. All pavements shall be designed in accordance with the "Manual Of Instructions For The Structural Design Of Bituminous Pavements" or the "Manual For Structural Design Of Portland Cement Concrete Pavements In Illinois" by the Illinois department of transportation, latest edition. All pavements are to have stone shoulders at least two feet (2') wide.
The minimum thickness shall be as hereinafter set forth. Design data shall be submitted to the village with EBR tests and shall provide structural numbers as set forth in the aforementioned manuals. If the subdivider chooses an alternate pavement design other than as specified in this section, it must meet the following minimum structural numbers and must be approved by both the village engineer and village board:
Minor residential streets | Dt | 3.5 |
All other streets | Dt | 4.0 |
(Ord. 99-O-791, 6-7-1999)