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General design requirements:
(A) Design period shall be 20 year minimum.
(B) Formal traffic study with projections and supporting data shall be submitted for design of all street classifications to provide minimum ESAL criteria.
(C) Initial (present) serviceability index factor shall be four and one half.
(D) Terminal serviceability index factor shall be two and one half minimum.
(E) All designs shall be in accordance with the AASHTO Guide for Design of Pavement Structures, latest edition.
STRUCTURAL NUMBER LAYER COEFFICIENTS
Pavement Materials | Min. Thickness of course (inches) | Structural Coefficient per inch thickness |
Asphaltic Concrete Surface | 3 | .44 |
Asphalt Concrete Binder | 2 | .44 |
Asphalt Stabilized Base | 4 | .34 |
Crushed Stone Base (Flexible) | 6 | .14 |
Crushed Stone Base (Rigid) | 3 | .14 |
Portland Cement Concrete | 6 | * |
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10
; Am. Ord. 2018-11-816, passed 11-6-18)
(A) In lieu of formal designs, the following minimum street pavement sections may be used; however, the city reserves the right to require a formal design for any street section.
Flexible Composite | Rigid* | |
Local Streets (ADT to 4000 and ESAL of 40) | 3 inch surface | 6 inch PC |
8 inch base | 3 inch base | |
(Minimum SN = 3.0) | ||
*All rigid pavement designs require a joint layout plan and associated details. | ||
(B) All other street classifications shall require formal design.
(1) Formal designs may be performed (are encouraged) by the design engineer to determine specific pavement sections required for specific subgrade and specific project requirements and these designs submitted to the City Engineer for review. Soils testing is required in compliance with the pavement design standards and a minimum acceptable subgrade CBR value of eight shall be required to utilize the minimum sections shown above.
(2) Joint spacing and joint design shall be in accordance with the AASHTO Guide for Design of Pavement Structures.
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10; Am. Ord. 2018-11-816, passed 11-6-18)
ARTICLE 90.600 UTILITIES AND UTILITY CROSSINGS
(A) All utilities to be located within the street right-of-way shall be installed in accordance with the specifications of the utility company involved and shall be subject to city ordinances governing utilities in street rights-of-way. The placement of utilities in the right-of-way outside of the pavement surface in the green area between the back of curb and sidewalk is encouraged.
(B) Utilities or encasements for utilities either under the street or located within three feet of the back of the curb shall be installed prior to the subgrade being completed.
(C) Minimum depth of water and sewer lines and testing requirements for backfill shall be as specified elsewhere in these standards and in the standard specifications for water line construction or standard specifications for sewer line construction.
(D) Flowable fill may be utilized as backfill for utility crossings if authorized specifically in writing by the city. A formal written request including product specifications shall be submitted to the city for review.
(E) Where encasement pipe is installed for future utility installation the encasement shall extend, as a minimum, from three feet from the back of the curb on one side of the street to three feet back of the curb on the other side of the street. Where a storm drainpipe or French drain is located parallel to the street, the encasement pipe shall extend a minimum of three feet beyond the outside edge of the drainage pipe.
(F) Encasements shall extend from right-of-way to right-of-way when required by the individual utility companies to avoid conflict with sidewalks, and the like.
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10; Am. Ord. 2018-11-816, passed 11-6-18)
ARTICLE 90.700 EROSION CONTROL
Erosion control measures shall be taken during construction to minimize the amount of silt and soil from entering adjacent streams and storm drainage facilities and to protect slopes and fill areas.
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10; Am. Ord. 2018-11-816, passed 11-6-18)
If the site to be disturbed is greater than or equal to five acres, then a notice of intent shall be filed with the Arkansas Department of Environmental Quality in accordance with state law and the requirements of current city ordinances with regard to storm water discharge and erosion control. All requirements shall be met and necessary permits submitted to the City Engineer for review prior to scheduling a preconstruction conference.
(Ord. 2009-11-347, passed 11-3-09; Am. Ord. 2010-06-356, passed 6-1-10; Am. Ord. 2018-11-816, passed 11-6-18)
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