The construction of all streets to be dedicated to the city shall meet the following criteria:
(A) The minimum dedicated right of way shall be fifty (50) feet;
(B) The subdivider or developer shall provide pavements on a subgrade that has been properly shaped, rolled and uniformly completed to conform with specified cross-sections and grades. Streets shall be constructed of Portland Cement Concrete (PCC) or Bituminous Concrete (asphalt) which conforms to all industry standards and to "Kentucky Department of Highways Specifications for Road and Bridge Construction."
(1) All subgrades shall conform to 95% compaction as defined by the Standard Proctor compaction test. It is the sole responsibility of the subdivider or developer to contract with a third party to perform said compaction test. The third party shall hold a Professional Engineer's License in the Commonwealth of Kentucky. All rock subbases shall extend at least twelve (12) inches beyond the edge of the pavement.
(2) Portland Cement Concrete streets with curbs and gutters shall be placed integrally. Concrete streets shall be constructed on a two-inch (2") rock base, well compacted and have at least ninety-five percent (95%) compaction (Standard Proctor). Streets shall be constructed in conformance with one of the following pavement specifications:
(a) Collector Streets (Functions to conduct traffic between arterial streets and local streets)
PCC Pavement | 2" DGA |
7 inches PCC | |
Asphalt | 6" DGA |
3" Class 1 Base Asphalt | |
1" Class 1 Surface Asphalt |
(b) Local Streets and Cul-de-sacs (for purpose of providing vehicular access and service to abutting property)
PCC Pavement | 2" DGA |
6 inches PCC | |
Asphalt | 6" DGA |
2" Class 1 Base Asphalt | |
1" Class 1 Surface Asphalt |
(c) Curb and Gutter
PCC Standard Vertical Face | 6" high and 6" side curb |
18" wide and 7" thick gutter | |
PCC Standard "Rolled" Curb | 24" total width |
6" high and 7" thick gutter (collector) | |
6" high and 6" thick gutter (local) |
(C) The pavement width shall be a minimum of twenty (20) feet. Shoulders shall be compacted and shall be a minimum of three (3) feet in width from the pavement edge. The distance from shoulder to ditch centerline shall be a minimum of three (3) feet. The ditch shall be a minimum of one (1) foot deep. The slopes of the sides of the ditch shall be no steeper than a ratio of 2:1.
(D) Certified engineering plans and specifications for storm water drainage shall be provided. Plans shall indicate the route and layout of all lines and ditches and location of all storm water runoff. All improvements shall be designed and constructed according to standard engineering practices. It is the responsibility of the developer and his/her engineer to obtain the best available design and construction. These requirements are adopted only as a minimum standard, and all developers should consider developing their subdivisions at higher standards. The city may require standards above the minimum contained herein and additional measures whenever it finds that the public health, safety and welfare justify such increase. Provisions shall be made for the satisfactory drainage of storm water by means of underground pipes and/or surface ditches. The storm water system shall be provided by the developer and shall be designed to accommodate the standard twenty-five (25) year storm and in all aspects shall meet the approval of the city.
(1) The drainage system shall met the following design requirements:
Pipe material | Reinforced concrete or corrugated metal |
Pipe size (street culverts) | 25 year storm |
Pipe size (entrance) | 10 year storm |
Minimum pipe size | 12" diameter |
Pipe length (street culverts) | ditchline to ditchline* |
Pipe length (entrance) | 16 feet** |
Minimum cover | 1 foot |
Drainage box materials | Precast, poured in place PCC |
Drainage box size | 25 year storm, minimum size - 2' x 2' |
Drainage box spacing | *** |
Drainage box tops | |
Traffic areas | H-20 loading |
Field areas | Iron frame with steel pipe bars |
*Headwalls on culvert pipes are not required; however, acceptable provisions must be made to prevent erosion around the pipe entrance.
**Entrance pipes for each lot shall be sized and indicated on the drainage plan.
***Drainage boxes in curb and gutter streets shall be spaced so as to confine the flow of storm water to an area within five feet (5') of the curb at the design storm. Boxes shall also be placed so as to provide drainage of street intersections, but in no case shall openings be farther than five hundred feet (500') apart. The boxes shall be constructed with a sufficient drawdown to the gutter opening and may be offset into the curb line.
(2) Easements for new, or the continuation of existing, utility and storm water drainage shall be provided for all developments with the width or other character as required by the design engineer based upon the recommendations from the various utility companies.
(E) Upon written request from the developer, the city will accept new streets into the city's street system for ownership and continuous maintenance after approval by the city council. This request shall be accompanied by the following:
(1) A letter from the developer's engineer certifying that materials, construction and testing comply with city specifications.
(2) A complete set of "as constructed" drawings. These shall show the profile of each street (with elevations of ground and street grade) and a typical cross-section of each street showing pavement width, rights-of-way and sidewalks.
Upon inspection and approval by the City Engineer, the developer shall be notified of the initial acceptance date. This date shall begin a one-year warranty period during which the city will periodically inspect the streets and the developer or his contractor will be responsible for correction to any defects found. After the one-year warranty period expires, the city will permanently accept the streets for continuous maintenance.
(F) All exposed areas of graded earth shall either be vegetated by seed, fertilizer and mulch or sodded. The amounts and types of materials used to vegetate to be approved by the city prior to acceptance so as to assure that adequate vegetative cover will be present to prevent erosion.
(G) Cul-de-sacs and turnarounds, a local street open at one end only, shall have a special turning area at the closed end. This turning area desirably should be circular and have a radius appropriate to the types of vehicles expected. Minimum outside radii of thirty feet (30') in residential areas and forty-five feet (45') in commercial and industrial areas are required.
(H) Street names shall be selected which will not duplicate nor be confused with names of any other existing street or road in Grayson County and in conformance with the street and road naming and property number regulations of the Grayson County E-911 Board. Proposed streets, which are clearly in alignment with existing streets, shall bear the name of the existing street. Generally, no street should change direction ninety degrees (90o) or more without a change in name, except in the case of a loop or circle.
(Ord. 95-13, passed 12-4-95)