(A) Generally.
The street system of any city account for about one-third of the land within the city and is the only system through which access and most of the services required in the use of private property must flow. The design of the street network of any city is, therefore, very important to the success and viability of the community and it is the intention of the City Council through the application of its policies and standards, that the continued expansion of the street system of this community will not impede access or the flow of services to private property, create hazards, or cause unnecessary traffic congestion.
(B) Minimum standards for improvement of streets and roads.
(1) Curb and gutter sections.
Streets or roads with curb and gutter sections shall be constructed of Portland cement concrete or asphaltic-surfaced flexible base sections.
(a) Minimum width for residential street pavement in a 50-foot right-of-way shall not be less than 28 feet for collector streets and 22 feet for cul-de-sac and minor residential streets backto-back of curb. For divided major thoroughfares, the developer will be required to build a minimum of a 24-foot street section and dedicate the ultimate rights-of-way.
(b) Minimum thickness shall be a six-inch uniform thickness for Portland cement concrete construction.
(c) All slabs shall be provided with an acceptance lead transmission device at the expansion joint, with expansion joints at approximately 60-foot intervals. Expansion joints shall also be placed at all structures and at curb return at street intersections. Material for expansion joints shall be redwood, asphalt saturated fiberboard, or approved equivalent material. All expansion joints shall be sealed with flexible, water-tight sealant.
(d) Contraction joints (dummy joints) shall have an approximate spacing of 20 feet.
(e) Construction joints (transverse), when not placed at an expansion of contraction joints, shall not be closer than ten feet to an expansion or contraction joint. Longitudinal construction joints shall be at the centerline of 24-foot wide or less pavement and at approved locations for greater width pavements.
(f) Concrete pavement shall be reinforced with three-eighths inch to five-eighths inch round deformed steel bars spaced not more than 24-inch center to center each way.
(g) Curbs shall be constructed monolithic or shall be doweled to the pavement.
(h) Minimum gutter gradients and inlet spacing shall be in accordance with drainage requirements.
(2) Streets or roads without curb and gutter.
(a) Generally. Streets or roads with an open ditch section shall have a roadway base crown and surface with the following minimum widths.
1. Ranchettes with ten acres or more and mobile homes with ten acres or more shall have a minimum base width of 20 feet, a minimum paved surface of 18 feet, and a minimum cross slope of one-fourth inch per foot.
2. Residential streets and major thoroughfares shall have a minimum base width of 25 feet, a minimum paved surface of 22 feet, and a minimum cross slope of one-fourth inch per foot.
3. Commercial and heavy industrial streets shall have a minimum base width of 26 feet, a minimum paved surface of 22 feet, and a minimum cross slope of one-fourth inch per foot.
4. The roadway shall be constructed of either reinforced Portland cement concrete pavement or Hot Mix Asphaltic Concrete pavement (in conformance with TxDOT Item 341, Type D) with crushed limestone (in conformance with TxDOT Item 247, Type A), crushed concrete (in conformance with TxDOT Item 247, Type D), iron ore, or Hot Mix Asphaltic Concrete flexible base course (in conformance with TxDOT Item 341, Type A or B). Bar ditches shall have side slopes no steeper than three to one front slope, or two to one back slope.
(b) Concrete pavement.
The slab thickness shall be a minimum of six inches thick, with the same reinforcing, expansion joints, contraction joints, and construction joints as recommended for six-inch pavement with curb and gutter.
(c) Stabilized bases.
The bases constructed of stabilized select aggregate or soil and shall be a minimum of six inches compacted thickness on all streets and roads, residential or thoroughfares. Commercial and heavy industrial shall have a minimum of eight inches compacted base thickness.
(d) Flexible base.
Flexible base courses shall be constructed of either crushed limestone (TxDOT Item 247, Type A), crushed concrete (TxDOT Item 247, Type D), iron ore (as specified below), or Hot Mix Asphaltic Concrete (TxDOT Item 341, Type A or B) (or approved equal). Crushed limestone, crushed concrete, and iron ore base courses shall be a minimum of eight inches compacted thickness on thoroughfares, commercial and heavy industrial, and a minimum of six inches compacted thickness on residential streets. Hot Mix Asphaltic Concrete bases courses shall be a minimum of three inches compacted thickness on thoroughfares, commercial and heavy industrial, and a minimum of two inches compacted thickness on residential streets.
1. Flexible base (iron ore).
Flexible base (iron ore) shall consist of a foundation course for surface course, composed of iron ore material and shall be constructed as herein specified and in conformity with the plans submitted to the city for approval. The material shall be approved by the city. Material containing gravel or hard pieces of ore exceeding the maximum specified size in their larger dimension shall be broken up and uniformly mixed with the remainder of the material.
a. When properly slaked and tested by standard laboratory methods as specified by TxDOT, AASHTO, and ASTM, the flexible base material shall meet the following requirements:
Retained on 2-1/2-inch sieve | 0% |
Retained on No. 40 sieve | 40% to 85%, or as approved by the City Council |
b. Material passing the No. 40 sieve shall be known as soil binder and shall meet the following requirements when prepared in accordance with test method Tex-101-E procedure:
The liquid limit shall not exceed | 35 |
The plasticity index shall not exceed | 12 |
2. Finish grade.
The finished grade to all roads shall not be less than the 50-year flood plain elevation.
3. Asphalt paving season.
Asphalt season shall be from April 1 to October 31 or as approved by the city.
4. Compaction of base.
All bases and flexible base courses shall be compacted to 95% standard proctor density. Compaction to be accomplished by using approved and acceptable compaction equipment.
(Ord. 96-0220, passed 2-20-1996; Ord. 19-1022A, passed 10-22-2019) Penalty, see § 154.99