A. General Requirements:
1. The classification and location of all streets shall conform to the village comprehensive plan, including the major streets plan, and this section, and shall be planned in relation to existing and proposed streets, topographical conditions, public safety and convenience, and anticipated land use.
2. Each lot or parcel of ground within a new subdivision shall be adjacent to a public street.
3. The street system in each new subdivision shall continue and extend existing connecting streets in adjoining subdivisions; except, that minor streets shall not be required to cross major streets unless such continuation and crossing is deemed necessary to promote pedestrian and/or vehicular circulation and safety.
4. The street system in each new subdivision shall be extended and dedicated to any property adjacent to the subdivision, except those instances in which the adjacent property is not and cannot be subdivided. (Ord. 2007-19, 5-21-2007)
5. No private streets shall be permitted in the village without prior approval from the village board of trustees. (Ord. 2011-22, 6-6-2011)
6. When a subdivision borders on and has lots fronting on or contiguous to a present or proposed arterial street, as depicted or described in the comprehensive plan and/or major streets plan, necessary traffic service to lots of the subdivision bordering such facility shall be provided by a marginal access street, local street, or collector street, unless otherwise authorized by the village engineer.
7. Access to an arterial street from a marginal access street, local street, or collector street shall be taken at approximately one-fourth (1/4) mile intervals, unless subdivision frontage is less than one-fourth (1/4) mile, in which case, the subdivision shall have no more than one access point to the arterial street, at a location to be approved by the village board of trustees.
B. Rights Of Way Dedications:
1. Subdividers shall dedicate rights of way for streets and easements, and if planned, alleys, in all new subdivisions.
2. When the subdivider owns the land on both sides of a proposed street, the entire right of way for the street shall be dedicated by the subdivider.
3. When the subdivider owns the land on only one side of an existing street, the existing right of way of which is narrower than that required by this title or the comprehensive plan/major streets plan, the subdivider shall dedicate additional right of way which lies between the centerline of the existing right of way and the outside edge of the additional right of way equal to at least one-half (1/2) of the required right of way width.
4. Minimum dedicated street rights of way shall be:
Arterial | 80 feet |
Collector | 70 feet |
Local | 60 feet |
Cul-de-sac radius | 50 feet |
Commercial/industrial alleys | 24 feet |
Residential alleys | 20 feet |
C. Street Names And Addresses:
1. Street Names: Proposed streets which are obviously in alignment or continuation of existing streets already named shall bear the name of such existing streets. The board of trustees may waive this requirement if it is in the best interest of the village to do so. In no case shall the name for a proposed street duplicate existing street names that are not continuous with it, irrespective of the use of the suffix street, avenue, road, boulevard, drive, place, or court, or an abbreviation thereof, or minor variations in spelling. Street names may be subject to the review of the Heyworth postmaster.
2. House Numbers: The house numbering system plan shall be submitted to the village engineer. The house numbering system shall be in accordance with the plan adopted by the village board, the Heyworth postmaster, the fire protection district, and the county emergency services and disaster agency.
3. Signs: Street name signs shall be purchased and erected by the subdivider at each street intersection within the subdivision, in accordance with section 12-7-6, figure 10, of this title.
D. Design Of Streets:
1. Widths Of Streets:
a. Minimum pavement widths for streets (as measured from back to back of curb) shall be:
Arterial | 51 feet |
Collector1 | 37 feet |
Local | 28 feet |
Cul-de-sac radius | 40 feet |
Commercial/industrial alley | 20 feet |
Residential alley | 16 feet |
Note:
1. Includes all streets in areas zoned commercial and industrial.
b. All subdividers are required to construct a minimum twenty eight foot (28') pavement width unless the project property line is the centerline of a dedicated street right of way, in which case, the subdivider shall construct one-half (1/2) of the required pavement width. If there is an existing street pavement within the existing right of way, the village may cooperate with the subdivider to upgrade the existing street pavement instead of constructing half street improvements. The subdivider's contribution toward upgrade of the existing street pavement shall be not less than the costs incurred to construct at least a sixteen foot (16') width of pavement, and one-half (1/2) the costs of street appurtenances including drainage and sidewalks.
c. If additional pavement width beyond the specified minimums and/or additional thicknesses are required, the village may participate in the additional cost.
2. Grades:
a. Maximum grade within fifty feet (50') of an intersection shall be five percent (5%).
b. Pavement centerline profile grades shall be:
Minimum | 0.40 percent |
Maximum | 10.00 percent |
Cross slope | 3/16 inch per foot minimum, 3.00 percent maximum |
3. Intersecting Streets: Streets shall be designed to intersect as close to a ninety degree (90°) angle as possible, and no two (2) streets shall intersect at an angle of less than eighty degrees (80°).
4. Adjacent Existing Streets: Where an existing street is adjacent to the subdivision, the subdivider shall improve the half of the street to conform to these standards; except, that where the existing street is a county highway or state highway, the village board may waive the requirements for street improvements subject to concurrence by the entity having jurisdiction over the roadway.
5. Street Jogs: Street jogs with centerline offsets of less than one hundred fifty feet (150') shall not be permitted if the same can be reasonably avoided and as authorized by the village engineer.
6. Horizontal Curves: Horizontal curves shall be gradual, having a radius of at least two hundred fifty feet (250') at the centerline, except where a lesser radius is, in the opinion of the village engineer, reasonably safe and adequate for anticipated traffic conditions.
7. Intersection Returns: Radii at pavement intersections shall be (measured to back of curb):
Arterial and collector thoroughfares | 30 feet |
Local or minor streets | 25 feet |
8. Sight Triangles: Sight triangles shall be provided via vehicular access control at all intersections of local streets with collector or arterial streets. Vehicular access control shall be not less than fifty feet (50') along the local or subcollector street at an intersection with a collector street. Vehicular access control shall be provided for not less than one hundred feet (100') along the arterial street at intersections with other streets.
9. Cul-De-Sacs:
a. Cul-de-sacs shall be provided when a street in a new subdivision is a permanent dead end street and cannot be continued to another street.
b. Cul-de-sacs in areas zoned residential shall have a minimum pavement radius of forty feet (40') (measured to back of curb) where the entire circle is paved. Cul-de-sacs in areas zoned commercial and industrial shall have a minimum pavement radius of fifty feet (50').
c. Cul-de-sacs shall have a maximum length of one thousand two hundred feet (1,200') measured from the centerline of the intersecting street to the center of the turnaround in areas zoned residential with single-family lots. For areas zoned residential with multiple-family lots and for all other zoning, cul-de-sacs shall have a maximum length of four hundred feet (400'), unless in the opinion of the village board, projected traffic counts, the topography of the land being subdivided or the physical situation of that land makes such a restriction impractical.
d. Driveways shall not encompass more than fifty percent (50%) of the curb on the bulb of a cul-de-sac street.
10. Specifications:
a. Pavement cross sections shall be as depicted on the details found in section 12-7-6 of this title. All pavements shall be constructed in accordance with the requirements of the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition.
b. Pavements for streets shall be either portland cement concrete pavement or bituminous concrete pavement in accordance with these standards.
c. All pavements shall be constructed with portland cement concrete curbs and gutters. The shape of the curb and gutter shall conform to the village standard curb and gutter type B (barrier) or type M (mountable). See details in section 12-7-6 of this title.
11. Access Requirements And Restrictions:
a. Provisions shall be made to grant access for future development of unplatted adjacent land at intervals of not more than one-fourth (1/4) mile.
b. Vehicular access control shall be provided to the maximum extent possible along state and federal highways. Marginal access streets shall be provided adjacent to arterial streets wherever possible.
12. Blocks:
a. Blocks shall not be less than four hundred feet (400') nor more than eight hundred feet (800') in length except as the village board of trustees considers necessary to secure efficient use of land or desired features in street pattern.
b. In blocks six hundred feet (600') or more in length, the village board may require a public crosswalk for pedestrian travel to extend entirely across the block at the location deemed necessary. The crosswalk shall be constructed of portland cement concrete in conformance with these standards for sidewalks. The width of the concrete shall be six feet (6'), and the crosswalk shall be located on a ten foot (10') commons area.
c. Blocks shall be wide enough to allow two (2) tiers of lots, except where fronting on major streets or prevented by topographical conditions or size of the property, in which case, the village board will approve the single tier of lots.
E. Alleys:
1. Required, Permitted And Prohibited Alleys:
a. Alleys may be provided for lots or parcels of ground intended for business, commercial or industrial uses.
b. Alleys shall not be allowed for lots intended for residential uses.
c. No dead end alleys will be permitted except under special conditions as authorized by the village engineer and the village board.
d. No private alleys will be permitted except under special conditions as authorized by the village engineer and the village board.
2. Construction Requirements: The alley pavement shall be constructed in accordance with the minimum construction standards set for streets.
F. Subgrades:
1. The street pavement subgrade shall have sufficient stability to accommodate construction traffic without excessive subgrade rutting or shoving. All subgrade compaction and testing shall be in accordance with the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition.
2. Existing topsoil shall be removed from the area of proposed street pavement, plus two feet (2') outside the proposed back of curb. Removal shall be to a depth as necessary to remove all organic material or ten inches (10"), whichever is greater.
3. Street subgrades shall be compacted to not less than ninety five percent (95%) of the standard laboratory density in accordance with the applicable section of the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition.
4. Areas of subgrade that are changed in elevation by more than three inches (3") after acceptance testing must be retested once final grade is achieved. Subgrades which are subjected to a freeze/thaw cycle prior to paving must be retested.
5. The suitability of all subgrades shall be tested via "proof rolling" with a loaded tandem truck. Any soft subgrade areas which show rutting, cracking, or rolling shall be reconditioned to provide a firm, suitable subgrade. A representative of the village shall be present to assess the suitability of the subgrade during proof rolling.
6. Any areas of street pavement subgrade which fail to meet or exceed the compaction requirements or fail the proof rolling test shall be remedied to achieve the required stability. Acceptable methods of remediation shall include, but not be limited to, aeration and recompaction, undercut and backfill, and lime treatment. The remedied areas must be retested and meet or exceed the requirements specified in this section. Streets which do not meet the minimum subgrade compaction requirements will not be accepted.
G. Pavement Materials:
1. Portland Cement Concrete:
a. All pavement designs must conform to the "Bureau Of Local Roads And Streets Manual" and be authorized by the village engineer. The subdivider's engineer shall provide pavement design calculations to verify compliance with design thickness requirements.
b. Minimum design thickness shall be:
Local residential and cul-de-sac; multiple-family residential alleys | 6 inch minimum thickness, nonreinforced |
Collector | 8 inch minimum thickness, nonreinforced |
Commercial and industrial, including alleys | 8 inch minimum thickness, reinforced with welded wire fabric mesh or reinforcing steel |
All other streets | The pavement design and thickness for a particular street shall be established utilizing the current IDOT design standards for the particular situation and as authorized by the village engineer |
c. All portland cement concrete pavement shall be underlain by a minimum of ten inches (10") of crushed aggregate base.
d. Longitudinal construction joints shall be tied with no. 4 deformed tie bars, thirty inches (30") long at thirty inch (30") intervals. All joint patterns are to be authorized by the village engineer.
e. Transverse construction joints shall be tied with smooth tie bars, thirty inches (30") long at fifteen inch (15") intervals, in accordance with the following schedule:
(1) For pavement thickness greater than eight inches (8"), the nominal dowel diameter shall be one and a half inches (1.5").
(2) For pavement thickness less than eight inches (8") but greater than seven inches (7"), the nominal dowel diameter shall be one and one-fourth inches (1.25").
(3) For pavement thickness less than seven inches (7"), the nominal dowel diameter shall be one inch (1").
f. Sawed contraction joints shall be provided at a maximum of fifteen foot (15') intervals.
g. The portland cement concrete shall be constructed in accordance with the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition, and meet the following requirements (where and if the provisions of these documents conflict, the stricter of the regulations shall apply):
(1) Have a minimum compressive strength of not less than three thousand five hundred (3,500) psi or a minimum modulus of rupture of not less than six hundred fifty (650) psi at an age of fourteen (14) days.
(2) Have a workable slump authorized by the village engineer, but in no instance greater than three inches (3") for machine placed concrete and no greater than four inches (4") for small areas of hand placed concrete. The first truckload each day and at least every fourth truckload thereafter shall be field tested.
(3) Concrete mix design shall be submitted to the village engineer for review prior to beginning concrete construction operations; test data from previous projects must accompany the mix design as verification of the strength of the proposed mix. Mix designs must contain a minimum of five hundred sixty four (564) pounds of cement per cubic yard of concrete.
(4) Be field tested for strength by an independent testing laboratory during construction by taking beam or cylinder specimens at a minimum rate of two (2) for every thirty (30) cubic yards of concrete poured, with a minimum of two (2) for pours under thirty (30) cubic yards.
(5) Be cured by standard procedures, as authorized by the village engineer.
(6) Be finished with a finishing machine authorized by the village engineer. The machine shall be self-propelled, capable of striking off, consolidating and finishing the concrete of the consistency required to the proper crown and grade, or other method authorized by the village engineer.
(7) Be air entrained (5 to 7 percent), with the first truckload each day, and every fourth truckload thereafter, field tested to verify the entrainment.
h. Portland cement concrete pavements shall be protected from all traffic (including construction equipment) for a period of not less than seven (7) days, or when test cylinders indicate that the pavement has reached a minimum compressive strength of three thousand five hundred (3,500) psi (650 psi minimum modulus of rupture).
i. Sawing of joints shall commence as soon as the concrete has hardened sufficiently to permit sawing without excessive reveling, but no later than ten (10) hours after the concrete has been placed. All joints shall be sawed to a depth of one- fourth (1/4) of the thickness of the slab before uncontrolled shrinkage cracking takes place. If necessary, the sawing operations shall be carried on both during the day and night regardless of weekends, holidays, or weather conditions.
j. The subdivider's engineer shall provide written documentation to the village engineer as to the time when portland cement concrete is placed and the time when saw cutting of joints takes place.
k. Joints in portland cement concrete pavement shall be cleaned and filled with hot or cold poured joint sealer.
l. Expansion joints shall be provided at locations indicated on the standard details in section 12-7-6 of this title. The location of all expansion joints shall be depicted upon the street paving plan.
m. Joint pattern details shall be provided in the site engineering drawings for all intersections, cul-de-sacs, and other unusual situations.
2. Bituminous Concrete:
a. All pavement designs must conform to the "Bureau Of Local Roads And Streets Manual" and be authorized by the village engineer. The subdivider's engineer shall provide pavement design calculations to verify compliance with design thickness requirements.
b. Minimum design thickness shall be:
Local residential and bituminous cul- de-sac; multiple-family residential alleys | 2 lifts of 2 inch thickness of bituminous concrete surface course; plus sufficient base course (minimum 10 inches) consisting of aggregate, bituminous aggregate mixture, or bituminous concrete binder to yield a minimum composite pavement structural number of 2.25 |
Collector | 2 lifts of 2 inch thickness of bituminous concrete surface course; plus sufficient base course (minimum 10 inches) consisting of aggregate, bituminous aggregate mixture, or bituminous concrete binder to yield a minimum composite pavement structural number of 2.5 |
Commercial and industrial, including alleys | 2 lifts of 2 inch thickness of bituminous concrete surface course; plus sufficient base course (minimum 10 inches) consisting of aggregate, bituminous aggregate mixture, or bituminous concrete binder to yield a minimum composite pavement structural number of 3.5. The pavement design and thickness shall be established utilizing IDOT design methods |
c. The following equation reflects the pavement structure thickness in terms of a structural number. The structural number is related to the thickness of the various layers of the pavement structure as follows for pavements with aggregate and stabilized base courses:
Dt = a1D1 + a2D2 + a3D3
Where: | ||
Dt | = | The structural number; a1, a2, and a3 are coefficients of relative strength of the surface course, base course, and subbase, respectively; |
D1 | = | Thickness of surface course in inches; |
D2 | = | Thickness of base course in inches; and |
D3 | = | Thickness of subbase in inches |
The coefficients a1, a2, and a3 are considered to be a measure of the relative strength, as related to performance, of the surface course, base course, and subbase materials, respectively. It is important to note that the value of a coefficient for a particular layer of the pavement is not constant, but is assumed to vary in accordance with the strength of the material to be used in that layer, as indicated in the following figure:
FIGURE - COEFFICIENT LIMITS FOR PAVEMENT STRUCTURE MATERIALS
Structure Materials | Strength Requirements | Coefficient Limits3 | ||||
M.S.1 | IBR | psi2 | a1 | a2 | a3 | |
Structure Materials | Strength Requirements | Coefficient Limits3 | ||||
M.S.1 | IBR | psi2 | a1 | a2 | a3 | |
Bituminous surface: | ||||||
Class B road mix | 0.20 | |||||
Class B plant mix (liquid asphalt) | 0.22 | |||||
Class B plant mix (asphalt cement) | 900 | 0.30 | ||||
Class I | 1,700 | 0.40 | ||||
Base course: | ||||||
Aggregate type B (uncrushed) | 50 | 0.10 | ||||
Aggregate type B (100 percent crushed) | 80 | 0.13 | ||||
Aggregate type A | 80 | 0.13 | ||||
Lime stabilized mixture | 150 | 0.11 | ||||
Soil cement | 300-500 | 0.15-0.20 | ||||
Cement aggregate (LR312) | 650 | 0.23 | ||||
750 | 0.25 | |||||
1,000 | 0.28 | |||||
Pozzuolanic | 0.28 | |||||
Asphalt stabilized (LR310) liquid asphalt | 0.18 | |||||
Bituminous aggregate mixture (LR311) | 900-1,900 | 0.24-0.33 | ||||
Bituminous mixture class I | 1,700+ | 0.33 | ||||
Subbase: | ||||||
Lime stabilized soil mixture | 100 | 0.12 | ||||
Granular material, type B | 30 | 0.11 | ||||
Granular material, type A (uncrushed) | 50 | 0.12 | ||||
Granular material, type A (100 percent crushed) | 80 | 0.14 | ||||
Notes:
1. Marshall stability or equivalent.
2. 7 day design compressive strength.
3. For materials with strengths other than that shown, the coefficients may be determined from pages 5-8-97 through 5-8-102. Other approved materials of similar strengths may be substituted for those listed in the table.
d. In accordance with article 406 of the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition, the bituminous concrete binder course and the bituminous concrete surface course shall be hot mix asphalt, low ESAL or high ESAL, or as recommended by the village engineer for a specific pavement design.
e. Bituminous materials must be produced at an IDOT approved plant.
f. An IDOT approved mix design specifications sheet must be provided to and authorized by the village engineer prior to use of the bituminous concrete mixture for pavement construction.
g. Aggregate base course shall be crushed stone, CA-6 or CA-10 gradation, and shall be type A. Aggregate base course shall be placed in lifts not exceeding five inches (5"). Base course aggregate shall be treated with a bituminous prime coat prior to the application of the bituminous concrete surface course or binder course.
h. All pavement base courses, binder courses, and surface courses shall be constructed in accordance with the "Standard Specifications For Road And Bridge Construction", IDOT, latest edition, and shall be field tested for proper compaction. Tests shall be at the rate of two (2) per lane per five hundred feet (500'). Bituminous concrete binder and surface courses shall have a minimum in place density of ninety three percent (93%), with no individual test below ninety two percent (92%). Aggregate base courses shall have a minimum in place density of ninety five percent (95%), with no individual tests below ninety five percent (95%).
H. Portland Cement Concrete Curb And Gutter:
1. All street pavements shall be provided with portland cement concrete curb and gutter.
2. The shape shall conform to the Heyworth concrete curb and gutter, type B or type M, or as authorized by the village engineer.
3. The portland cement concrete shall meet the requirements for pavements as set forth elsewhere in this title. All testing requirements shall apply.
4. The concrete curb and gutter shall be constructed separate from or integral to concrete pavement. The curb shall be constructed by hand or machine in a manner authorized by the village engineer.
5. Contraction joints shall be provided at not less than twenty foot (20') intervals for curb and gutter adjacent to bituminous concrete pavement, and not less than fifteen foot (15') intervals adjacent to portland cement concrete pavement.
6. Expansion joints shall be provided at locations as indicated in the standard details in section 12-7-6 of this title. Expansion joints for curbs and gutter shall include an eighteen inch (18") long smooth dowel bar with pinching stip cap, placed at middepth.
7. When curb and gutter is constructed independently from portland cement concrete pavement, the longitudinal joint shall be considered a construction joint.
8. Curb and gutter shall be provided with not less than three-fourths inch (3/4") slope per foot transverse slope, as shown on the detail found in section 12-7-6 of this title. Curb and gutter with less than this minimum slope shall not be acceptable, and shall be removed and replaced if installed with inadequate transverse slope.
9. The stormwater curb and gutter frames, lids, and/or grates shall be of the type currently conforming to the standards of the IDOT. No design that may be a hazard to bicycles shall be allowed.
I. Testing And Acceptance:
1. All pavements shall be tested for compliance with the requirements of this title. Pavements will not be accepted that do not conform to all testing requirements.
2. Before final review, all pavements shall be cored for thickness by the subdivider in the presence of the village engineer or other representative of the village. Two (2) cores shall be taken every five hundred feet (500') per lane unless deficiencies are encountered. When deficiencies are encountered, additional cores shall be taken as needed to document the extent of the deficiency. Requirements, in the event of deficient pavement thickness, shall be as follows:
a. Four percent (4%) deficiency will be accepted only in isolated areas.
b. Four percent (4%) to eight percent (8%) deficiency will require the developer to file a five (5) year maintenance bond with the village in addition to other bonds required. The amount of the bond shall be one hundred fifty percent (150%) of the estimated cost of removing and replacing the defective pavement at the end of the five (5) year period.
c. Eight percent (8%) and over deficiency will be removed and replaced to the thickness shown on the drawings.
3. If portland cement concrete pavement test specimens do not attain the required strength as stated above, the pavement may be accepted if the in place strength of the concrete meets the minimum specified strength when cored and tested according to American Concrete Institute (ACI) standard methods.
4. a. If the in place pavement strength, air content, or compaction of bituminous concrete is found to be deficient or other obvious defect is found to exist, subject to the review of the village engineer, the subdivider shall either:
(1) Remove and replace the deficient sections of pavement; or
(2) Post a five (5) year cash bond as determined by the village engineer in the amount of one hundred fifty percent (150%) of the estimated cost to remove and replace the deficient pavement at the end of the five (5) year period.
b. If any significant pavement deterioration or defect appears in the subject pavement within the five (5) year bond period, the deteriorated or defective section shall be removed and replaced. If no deterioration or defects appear within the five (5) year period, the bond shall be released.
5. a. In the event that the subdivider fails to properly test and document subgrade compaction, air content, slump, and saw cut timing, subgrade compaction, or asphalt compaction, the subdivider shall either:
(1) Remove and replace the deficient pavement sections; or
(2) Post a five (5) year cash bond in the amount of one hundred fifty percent (150%) of the estimated cost to remove and replace the deficient pavement.
b. If any defect, deficiencies or other failures appear in the pavement within the five (5) year bond period, the deficient pavement shall be removed and replaced. If no failures appear within the five (5) year period, the bond shall be released. (Ord. 2007-19, 5-21-2007)