Improvements for streets shall be performed to meet the following minimum standards and requirements:
(A) The dimensions for paved surface dimensions shall be as follows:
(1) For local and cul-de-sac streets:
(a) The width, with curb and gutter, shall be 26 feet from back to back of curb for areas that are not served by a municipal sanitary sewer system;
(b) The width, with curb and gutter, shall be 30 feet from back to back of curb for areas served by a municipal sanitary sewer system;
(c) The terminus diameter on a local cul-de-sac shall be 80 feet and the terminus diameter on a local cul-de-sac with more than eight lots shall be 100 feet;
(d) The radius at intersections shall be 35 feet.
(2) For collector streets:
(a) The width, with curb and gutter, shall be 38 feet from back to back of curb;
(b) The radius at intersections shall be 35 feet;
(c) At an intersection of a subdivision local or collector street with an arterial or major collector street or road, the Commission may require the subdivider to install acceleration and deceleration and/or passing lanes along the arterial or collector street in accordance with Chapter 153 (Road Permits Regulations).
(d) The terminus diameter on a cul-de-sac shall be 120 feet.
(e) Commercial and industrial subdivisions shall follow the requirements for a collector street.
(B) The minimum standards for street construction shall be in accordance with the Standard Specifications of the State Department of Highways, current edition, and all applicable up-to-date revisions to each edition, or subsequent superseding edition thereafter referred to as the “Standard Specifications,” unless otherwise required by this chapter. Copies of the Standard Specifications are on file in the office of the County Engineer. The minimum thickness of sub-base, base, and pavement shall be as follows:
(1) The preparation of subgrade for street pavements shall be according to the following provisions:
(a) Preparation of subgrade for street pavements. Unless otherwise provided, the subgrade shall be prepared per Section 215, Chemical Modification of Subgrade Soils, of the Standard Specifications. During subgrade preparation and after its completion, adequate drainage shall be provided at all times to prevent water from standing on the subgrade. Subgrades shall be so constructed to have as nearly as possible uniform density throughout. After compaction and final grading, the subgrade shall be finished with a roller weighing not less than ten tons. At areas not accessible to the roller, the required compaction shall be obtained with mechanical tamps or vibrators. All soft yielding or otherwise unsuitable material which will not compact properly shall be removed. Any holes or depressions resulting from the removal of the unsuitable material shall be filled with satisfactory material and compacted to conform with the surrounding subgrade surface. No placement of pavement shall be permitted on uninspected or unapproved subgrade and at no time when the subgrade is frozen or muddy. No hauling shall be done nor equipment moved over the subgrade when it is in a condition that would cause undue distortion to result. If these conditions are present the subgrade shall be protected with adequate plank runways, mats or other satisfactory means if hauling is done thereon;
(b) All utility excavations under the pavement shall be backfilled with Grade B borrow and construction shall conform to Section 211 of the Standard Specifications or compacted thoroughly by other means. The gradation for “B” borrow will be limited to nominal sizes greater than ½ inch;
(c) All subgrade for streets shall be proof-rolled per the County Engineer and tested by an independent testing laboratory, if so directed by the County Engineer, and the cost of this testing shall be paid for by the subdivider.
(2) The provisions for construction of rigid pavement shall be as follows:
(a) Rigid pavement. For local and cul-de-sac streets, a six-inch plain concrete pavement, as set out in subsection (3)(a) below shall be used, on five inches of compacted #53 stone on modified subgrade per Section 215 of the Standard Specifications;
(b) For collector streets, an eight-inch reinforced concrete pavement, on six inches of compacted #53 stone on modified subgrade per Section 215 of the Standard Specifications, shall be used.
(3) The provisions for construction of rigid (plain concrete) pavement construction shall be as follows:
(a) At the time of placement of the concrete, the subgrade shall be properly dampened just prior to the placement where it has become dry, where the surface has been removed by final grading, or for any other reason it has not been properly dampened. Concrete pavement shall be in accordance with Section 500 of the Standard Specifications or any subsequent amendments thereto. Concrete shall be finished by machine or vibratory screed except on widened portions, intersections or other places where hand-finishing will be permitted. Weakened plane or dummy, transverse, or contraction joints shall be placed not to exceed 20-foot spacing. Closer spacing to average 15 feet will be encouraged. Transverse contraction joints may be of formed or sawed dummy groove, ribbon or premolded strip type, and shall be one-fourth the pavement depth. When transverse joints are to be formed by sawing, care must be taken to prevent the formation of cracks due to contraction of the slab. All transverse joints shall be sawed within eight hours after the placing of the concrete. Expansion joints, with -inch preformed joint filler, shall be placed at every catch basin and manhole in line of the pavement. The location of manholes and the like in the pavement shall determine the exact location of the joints. All joints shall extend through curbs to the full width of the pavement;
(b) Whenever the width between forms of the pavement under construction is greater than 13 feet, longitudinal joints shall be constructed so as to divide the pavement into strips not to exceed 13 feet each. This shall be accomplished by a deformed key plate installed prior to the depositing of the concrete;
(c) The method of curing shall be a white pigmented curing compound type 2, complying with AASHTO M 148, and shall be applied in one or two applications as directed by the County Engineer. When applied in two applications, the second shall follow the first within thirty minutes.
(4) The provisions for construction of flexible pavement shall be as follows:
(a) For local and cul-de-sac streets, 165 lbs./SY HMA surface course on 330 lbs./SY HMA intermediate course on six inches of compacted #53 stone on modified subgrade per Section 215 of the Standard Specifications. The 165 lbs./SY of HMA surface may be placed at a later time, but not to exceed either of the following:
1. When 80% of the subdivision lots have homes built on them; or
2.
A three-year period, starting from the date of completion and posting of a maintenance bond. A cash bond or letter of credit shall be posted to ensure the performance of the placing of the asphalt surface. If the above requirements are not met, then the County Board of Commissioners shall not allow issuance of any building permits until the asphalt surface is placed and accepted.
(b) For minor and major collector streets, 165 lbs./SY HMA surface course on 330 lbs./SY HMA intermediate course on 385 lbs./SY HMA base course on six inches of compacted #53 stone on modified subgrade per Section 215 of the Standard Specifications.
(c) For minor and major arterial streets, 165 lbs./SY HMA surface course on 330 lbs./SY HMA intermediate course on 990 lbs./SY (three lifts) HMA base course on six inches of compacted #53 stone on modified subgrade per Section 215 of the Standard Specifications.
(5) (a) Flexible pavement construction shall be constructed in accordance with the requirements of Section 402 of the Standard Specifications, with the exceptions as noted below. Materials shall comply with the requirements of Sections 902.01(a) and 904 of the Standard Specifications.
(b) Mixture type shall be selected using the following table:
Section 402 Mixture Type | Road Classification per the Thoroughfare Plan* |
A | Minor Collector, Local |
B | Minor Arterial, Major Collector |
C | Major Arterial |
* From the Hancock County Comprehensive Plan, Chapter 151 of the Hancock County Code.
(c) Surface aggregate type: For Type A and B mixtures, the surface aggregate requirements shall meet the requirements for less than 3,00,000 ESAL in 904.03(d). For Type C mixtures, surface aggregates shall meet the requirements for less than 10,000,000 ESAL in 904.03(d).
(d) Density: Compaction shall be in accordance with 402.15 for all mixture types. When directed by the County Engineer, core samples shall be obtained from the pavement for final acceptance in accordance with 401.16. The maximum specific gravity shall be supplied from the Certified HMA Producer in accordance with 402.02. The pay factors of 401.19 will not apply.
(e) PG Binder Grade: Asphalt binder grades are listed in the following table for Type A, B and C mixtures.
Mixture Type | Mixture | 0% RAP | Up to 15% RAP | >15% to 25% RAP |
Mixture Type | Mixture | 0% RAP | Up to 15% RAP | >15% to 25% RAP |
A | Surface | 64-22 | 64-22 | Not allowed |
Intermediate | 64-22 | 64-22 | 58-28 | |
Base | 64-22 | 64-22 | 58-28 | |
B | Surface | 64-22 | 64-22 | Not allowed |
Intermediate | 64-22 | 64-22 | 58-28 | |
Base | 64-22 | 64-22 | 58-28 | |
C | Surface | 70-22 | Not allowed | Not allowed |
Intermediate | 70-22 | 70-22 | 64-28 | |
Base | 64-22 | 64-22 | 58-28 | |
(f) Acceptance will be based on Section 402.09.
(g) Sampling and testing. All sampling and testing shall be paid by the contractor.
(6) The special requirements for industrial and commercial subdivisions are where streets are designed to serve industrial or commercial subdivisions or sites, or other developments requiring service by many heavy vehicles, the minimum pavement thickness will be that for a collector street. The asphalt mixture type for industrial and commercial subdivisions shall be Type C.
(7) Temporary gravel construction shall be required at the entrance to a construction site to prevent sediment from being tracked from a site onto a public or private roadway.
(C) Concrete curbs and gutters shall be required for all streets. A typical cross section is shown in
Chapter 155 Appendix R.
All concrete curb used in the construction of medians shall have a certical face. A slightly different curb and gutter configuration may be permitted at the discretion of the County Board of Commissioners. When curbs and gutters are built in conjunction with concrete pavement, expansion and contraction joints should be placed at the same locations as in the pavement slab, and the curb and gutter shall be tied to the pavement by -inch round deformed bars at about three-foot intervals. Otherwise concrete curb and gutter expansion joints should be placed at the ends of all returns and at intervals not to exceed 100 feet. Contraction joints shall be installed at 20-foot spacing. The curb and gutter shall be cured by keeping the concrete moist for three days, or cured by the use of a white membrane-forming material.
(D) Sidewalks. In developments having a density equal to or greater than 0.5 units per acre, the plan shall include public sidewalks which shall be constructed by the builder/lot owner at the time of construction of the residence. The sidewalk shall extend along the entire street frontage of each respective lot and shall be constructed prior to completing finish lot grading. The sidewalk shall be located one foot inside the street right-of-way line, (not on the lot and parallel to the street right-of-way line. All sidewalk design and construction shall comply with the Americans Disabilities Act (ADA), as amended. Sidewalks shall be at least four feet wide and four inches thick, sloped. The sidewalk expansion joints, with -inch preformed joint filler, shall be placed at a maximum of 48 feet and transverse joints shall be placed at six feet. The subgrade shall be graded and compacted before concrete placement. The lot owner is responsible for the repair and maintenance of the sidewalk for the initial one year from completion of residence. Thereafter, the homeowner’s association shall be responsible for maintenance and upkeep of the sidewalk except for any damage done by the adjoining lot owner.
(E) No new subdivision street shall have drainage swales. Swales shall be placed along existing county roads as follows:
(1) Twenty-four-foot long corrugated (non-spiraled) pipe or concrete pipe shall be placed at all driveways and sized according to the calculated amount of storm water flow, but not less than 12 inches in diameter. The minimum cover over any culvert will be 12 inches.
(2) Culverts shall be placed or extended under the roadway where necessary. The size of the culvert shall be according to the calculated amount of storm water flow, but not less than 12 inches in diameter. All culverts shall extend from right-of-way to right-of-way unless otherwise permitted by the County Board of Commissioners. All culvert pipe that is banded together shall receive a minimum of a 12-inch band with eight-inch long bolts. All culverts shall have applicable end sections, unless waived by the Board of Commissioners.
(3) Swales having a grade of 3%, 4% or 5% shall have a gutter consisting of sod, or if in excess of 5%, shall have a gutter consisting of concrete.
(F) It shall be the responsibility of the subdivider to provide and install all required signs including street signs, stop signs, warning signs, speed limits and any other regulatory signs as may be deemed necessary by the County Board of Commissioners. All sign materials and installation procedures shall meet the requirements of the latest edition of the State Manual on Uniform Traffic Control Devices. The location and type of all signs in a subdivision shall be identified in construction drawings and presented to the County Board of Commissioners for approval. The subdivider shall also prepare and submit the necessary ordinance(s) to permit installation of all regulatory signs for approval by the County Board of Commissioners.
(G)
The County Highway engineer shall collect, in advance of the first inspection, a fee payable to the County MVH Fund to inspect all matters required by this section regarding the installation of streets. The inspection shall include storm sewers, underdrains, road subgrade, curbs, stone grade, asphalt, final inspection and inspection after three years. The fee shall be set by resolution of the Board of Commissioners.
(H) The provisions for street lighting shall be as follows: In development having a density equal to or greater than 0.5 units per acre the developer shall install or have installed with the street construction, street lights adequate to light all road intersections, curves, cul-de-sacs and entrances in the development in compliance with the following standards.
(1) The street light spacing shall be in compliance with the following minimum foot candle requirements. Street lights in general shall be on property lines and staggered on opposite sides of the street.
(a) Residential entrances 1.2
(b) Residential streets 0.5
(c) Public or private parking lots 1.2
(d) Park areas with playgrounds or walking/biking trails 0.5
(2) All lighting components shall be of utility quality columns and fixtures with photovoltaic devices conforming to ANSI standard C136.10. Developments are encouraged to integrate decorative designs where practical.
(3) Light column foundations shall be placed on the back side of the sidewalk away from the street or no closer than nine feet from the back of the street curb and extend no more than four inches above finished grade and no less than 36 inches below grade. In situations where straight or non- mountable curb is used, the distance from the back of the curb may be reduced to four feet. Light fixture height shall be 12 feet above the foundation.
(4) The luminary fixture shall be environmentally friendly, have a 150 watt high-pressure sodium lam and have a globe made of acrylic or non-yellowing material excluding glass and must have a canopy.
(5) All equipment, including but not limited to the light column, luminaire and additional fixtures shall remain the property of the developer or homeowner’s association who shall be responsible for all the maintenance of said equipment as well as all operational cost of said equipment.
(’86 Code, § 7.1-47) (Ord. 1993-9G, passed 9-27-93; Am. Ord. 1994-10C, passed 10-3-94; Am. Ord. 2001-6E, passed 6-25-01; Am. Ord. 2003-4A, passed 4-7-03; Am. Ord. 2006-2C, passed 2-6- 06; Am. Ord. 2006-6C, passed 6-19-06; Am. Ord. 2007-8A, passed 8-6-07; Am. Ord. 2015-10E, passed 10-20-15)