[HISTORY: Adopted by the Board of Trustees of the Village of New Hempstead 8-15-1985 by Res. No. 85-185; amended 4-10-1986 by Res. No. 86-115. Subsequent amendments noted where applicable.]
It is the purpose of these specifications to establish minimum acceptable methods of street construction, including widths and development of right-of-way, paved roadway, storm drainage and other utilities in the Village of New Hempstead. Dedication of the right-of-way will not be acceptable until the Village Engineer shall have certified to the Village Board that the development of the street has been completed in accordance with the approved plans and the specifications which follow.
A plan of the proposed street shall be prepared by a qualified engineer properly licensed by the State of New York or a land surveyor possessing a proper exemption certificate issued by the State of New York Education Department. The plan shall clearly define the limits of the proposed right-of-way and shall include the location, width, profile and grades of proposed roadways, storm drainage, including culverts and other drainage structures, and the location of easements and utilities. The plan shall be submitted to the Town Superintendent of Highways and/or to the County Superintendent of Highways when any street drains toward or connects to a county highway or town road and to the Village Planning Board for review and approval under the applicable Subdivision Regulations of the Village. Such plans so submitted shall not be altered or amended after having been approved by the Planning Board, except after amended plans have been resubmitted and approved as above. However, the developer shall, at his own expense, provide additional storm drainage facilities as may be ordered by the Town Superintendent of Highways, the County Superintendent of Highways or the Village Engineer where such additional structures or facilities are necessary to assure the durability of pavement and future maintenance of the right-of-way.
The developer's engineer/surveyor shall establish and clearly mark on the site the limits of the right-of-way, the center line and grades of the roadway and the location and elevation of the drainage structures. Such markers shall be maintained at the developer's expense until construction of the roadway, drainage, curbs and shoulders has been completed and approved by the Village Engineer.
The entire width of the right-of-way shall be cleared and shaped to the grades and elevations established by the approved plan and as approved by the Planning Board. Trees of aesthetic value located at least five feet from the paved roadway may be allowed to remain. All rock and boulders larger than six inches in diameter shall be excavated six inches below the finished subgrade of the roadway. All topsoil or otherwise soft or unstable material shall be excavated from within the road area and shall be replaced with suitable borrow. Fill required to complete the approved grades shall be acceptable to the Village Engineer, and unsatisfactory materials shall be removed from the site by the developer.
[Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I)]
Where fills are necessary to complete the required line and grade or to backfill trenches or other excavations, the materials incorporated in the work shall be acceptable to the Village Engineer and shall be placed in layers not exceeding eight inches in depth, each layer to be thoroughly compacted by rolling with three-wheeled sheepsfoot, pneumatic-tired or padded-wheel roller or by impact rammer or vibrator equipment in areas inaccessible to power rollers. All compaction shall continue until the fills are firm and unyielding. Adequate compaction is considered to be 95% of the standard proctor maximum density.
The rough grade of the road pavement, curb and sidewalk areas shall be completed to within one inch below but not above the finished subgrade as shown on the approved cross section of the right-of-way improvement.
Earth shoulders and the flow line of ditches and gutters shall be maintained in satisfactory condition, at the developer's expense, at all times during the course of construction of the subdivision and until such time as the Village Board has accepted dedication of the right-of-way.
Soil erosion and sediment control measures shall be constructed and maintained by the developer during the entire course of development of the streets and public easements in accordance with the guidelines for erosion and sediment control in urban areas of New York State developed by the United States Department of Agriculture, Natural Resources Conservation Service.
[Amended at time of adoption of Code (see Ch. 1, General Provisions, Art. I)]
An erosion and sediment control plan shall be made a part of the construction plans for the streets and easements, showing locations of proposed diversion berms and sediment basins. All such berms and basins shall be in place prior to the grading operation and the installation of utilities and shall be maintained until construction is completed and/or the area is stabilized. Sediment basins shall be cleaned when the trap is 50% full of sediment.
Soils to be stockpiled should be located so as not to obstruct natural drainage or cause off-site sediment problems. Stockpiled soil will be established to temporary vegetative cover when exposed for a period of more than one month.
All disturbed areas shall be limed and fertilized to soil test recommendations such as those offered by the Cornell University Extension Service prior to both temporary and permanent seeding. Disturbed areas, including road banks, shall be maintained in a rough-graded condition and temporarily seeded and/or mulched until proper weather conditions exist for the establishment of permanent vegetative cover.
All storm drainage inlets are to be temporarily capped and protected by a filter to prevent entry of sediment carried by runoff water until vegetation and/or paving is established as planned.
Prior to the construction of curbs, diversion berms shall be graded and maintained on a daily basis at one-hundred-foot to three-hundred-foot intervals, depending on slope, across roadways, directing runoff to undisturbed areas or sediment traps. After the construction of curbs and prior to paving, berms shall be graded and maintained on a daily basis at each catch basin, directing runoff into the catch basin through a sediment filter. Easement areas for utility pipes shall have similar berms which should remain permanently, if appropriate. Easement areas shall be graded and stabilized immediately after the installation of pipes and structures.
Storm drains draining areas up to 50 acres shall be designed on the basis of a twenty-five-year average frequency of rainfall. For areas of 51 acres to 200 acres, a fifty-year storm shall be used, and for areas greater than 200 acres a one-hundred-year storm shall be used. The stormwater runoff drain shall be of the type and size designed and shall be constructed to the prescribed lines and grades at the approved locations. The minimum grade of any drainage pipe shall be 1% unless it can be adequately demonstrated that a lesser grade is absolutely necessary. The minimum pipe size shall be 15 inches in diameter.
The storm drain pipe shall be corrugated metal pipe or reinforced concrete pipe meeting New York State Department of Transportation specifications.
Catch basins or manholes shall be provided at all points of change of slope or alignment and at all junction points. At no time shall catch basins be spaced farther than 300 feet apart. In areas of steep slopes or where large amounts of water may collect in road gutters, additional basins may be required.
Concrete headwalls shall be provided at the inlet or outlet of any storm drain at a drainage channel. The headwall may be straight, L-shaped or U-shaped, as is most appropriate for the given situation. The shape of the headwall shall be shown on construction plans, and its details shall be in accordance with the standard details shown in these specifications, unless conditions warrant a special design, which shall be shown as part of the construction plans in detail.
Editor's Note: The standard details and drawings are included in an attachment to this chapter.
Precast concrete or prefabricated metal end sections may be used where appropriate conditions exist. Depending on flow conditions, a cutoff wall 2 1/2 feet in depth anchored to the end section may be required.
Riprap or stone fill shall be placed at all headwalls for a sufficient length and height to adequately provide for transition of ground slopes and water velocities to prevent erosion.
With the approval of the Planning Board, open ditches may be used in lieu of storm drainpipes when the grade of the land traversed is flat or when it is desirable to drain and dry up the surrounding area.
Open ditches shall be constructed in accordance with the illustration in these specifications, but in no case shall the grade of an open ditch exceed 3%. Riprap, when called for, shall consist of field stone or rough, unhewn quarry stones, as nearly cubical in form as possible, placed upon a slope not steeper than one vertical to two horizontal and so laid that the weight of the large stones is carried by the soil and not by the stone adjacent. All stones shall weigh between 50 pounds and 150 pounds each, and at least 60% of them shall weigh more than 100 pounds each.
The larger stones shall be placed first, roughly arranged and in close contact. The spaces between the larger stones shall be filled with spalls of suitable size.
The width of the trench in which the pipe is placed shall be sufficient to permit thorough tamping of the backfill under the haunches and around the pipe. Where rock in either boulder or ledge formation is encountered, it shall be removed below grade and replaced with suitable materials in such a manner as to provide an earth cushion having a thickness under the pipe of not less than eight inches; and where there are excessively heavy fills over the top of the pipe, the Village Engineer may specify that an earth cushion up to 1/2 inch in thickness per foot of fill be placed over the top of the pipe. In no case shall the top of any drainage pipe be less than 18 inches below the finished grade of the pavement. Where soft, spongy or other unstable soil is encountered at the grade established, all such unstable soil under the pipe and for a width of one diameter on each side of the pipe shall be removed and replaced with run-of-bank gravel or other acceptable material. In all cases the bed shall be thoroughly compacted and shall provide a firm foundation for the pipe.
Pipe shall be laid to true line and grade on the prepared bed of the trench. All connections for making field joints in corrugated metal pipe shall consist of corrugated metal bands so constructed as to lap on equal portions of each of the culvert sections to be connected. All joints in making field connection of reinforced concrete pipe shall be filled with portland cement mortar.
Any additional drainage facilities not shown on the approved plan and which may be ordered by the Village Engineer shall be constructed by the developer at the developer's expense and in accordance with these specifications.
Catch basins and manholes shall be constructed in accordance with the standard drawings in these specifications, utilizing materials and methods in conformance with current New York State Department of Transportation specifications. Particular care shall be exercised in backfilling around completed structures to obtain maximum compaction by the use of mechanical tamping equipment in order to avoid pavement settlement. Pipes shall be trimmed in a workmanlike manner flush with the inside walls of structures, leaving no rough edges which would endanger maintenance personnel.
Excavation and backfilling for underground utility pipes and cables shall be done in strict conformance with the requirements outlined above for storm drain construction. All utilities shall be placed prior to the paving of new roadways.
If there are no sidewalks, shoulders and slopes to complete the balance of the right-of-way shall be at least 10 feet wide and shall be graded to meet the finished elevation of curbs or gutters on a slope of 1/2 inch per foot for a distance of five feet from the edge of the curb or gutter and thence on a slope of not more than one vertical to two horizontal to the limits of the right-of-way, both in cut and fill. Exceptions to these requirements, where rock or other conditions exist, may be approved by the Village Engineer. On any fill section where the elevation of the shoulder is five feet or more above that of the toe of the slope, the developer shall provide guide railing on the shoulder as approved by the Village Engineer. Shoulders and slopes shall be dressed, topsoiled and seeded by the developer.
Before fine grading or construction of curbs and sidewalks is started, all storm sewers and sanitary sewers and all utilities, including house connections and hydrants, shall have been thoroughly compacted to the satisfaction of the Village Engineer.
After completion of the rough grade and prior to the laying of the foundation course, the subgrade shall be shaped to line and grade and thoroughly compacted with an approved self-propelled roller weighing not less than 10 tons. All hollows and depressions which develop under rolling shall be filled with acceptable granular material and again rolled, this process to be continued until no depressions develop. The subgrade shall not be muddy or otherwise unsatisfactory when the foundation course is laid upon it.
Any soft or unstable portions of the subgrade which develop under the roller shall be completely excavated and removed from the right-of-way and shall be replaced with acceptable granular material and the area regraded and compacted as above.
Fine grade shall conform to the prescribed width of pavement and shall extend equidistant from the center line of the road right-of-way and shall conform to the typical cross section of the road pavement and to the approved line and grade.
The materials and methods of mixing bituminous pavements shall conform to the New York State Department of Transportation specifications on the Composition of Bituminous Plant Mixtures Table, included as an attachment to this chapter.
Pavement shall only be placed on an approved dry subgrade. Before the paving operations start, the surface temperature must be:
The surface of any existing pavement shall be cleaned, the joints and cracks filled and the surface leveled to a uniform grade and cross slope in areas designated by the Village Engineer prior to the application of a new bituminous course.
If, in the Village Engineer's opinion, a tack coat of bituminous material is needed on old bituminous pavement prior to the placement of the new bituminous mixture, the contractor shall place such material. The tack coat shall meet the New York State Specifications, Section 407.
Unless otherwise stated by the Village Engineer, paving operations shall be halted if adverse weather conditions occur.
The mixture shall be transported from the mixing plants to the worksite in tight vehicles having clean, smooth metal beds. Each load shall be covered with canvas or other suitable materials of such size as to protect the mixture from the weather. The inside surface of the vehicles used for the transportation of plant mixes shall be lightly coated, just before the vehicles are loaded, with either a whitewash of lime and water, soap solution or detergents, as approved by the Village Engineer, or fuel oil applied by a high-pressure fog system. After application, the truck bodies shall be raised for a sufficient time to allow the excess fluid to drain.
The asphalt shall be placed at the temperatures shown on the Composition of Bituminous Plant Mixtures Table of the New York State Department of Transportation, included as an attachment to this chapter.
Bituminous pavers shall be self-powered units provided with an activated screed or strike-off assembly. The machine shall be capable of spreading and finishing courses of bituminous plant mix material in lane widths applicable to the specified typical section and thicknesses shown on the plans. The paver shall have a receiving hopper with sufficient capacity for uniform spreading operation and with automatic flow controls to place the mixture uniformly in front of the screed. The screed or strike-off assembly shall be heated as necessary to produce a finished surface of the required evenness and texture without tearing, shoving or gouging the mixture. When laying mixtures, the paver shall be capable of operating at forward speeds consistent with the satisfactory placement of the mixtures.
The bituminous paver shall be at the jobsite sufficiently ahead of the start of the paving operations to be examined and approved by the Village Engineer. Any paver found worn or defective either before or during its use shall be immediately repaired to the satisfaction of the Village Engineer or replaced.
Approved bituminous pavers shall be used to distribute the mixture either over the entire width or over such partial width as may be practicable. Placing of the mixture shall be continuous at a desired rate of not less than 50 tons per hour. The Village Engineer may permit a lesser rate if satisfactory results are achieved. Upon arrival at the site, the mixture shall be dumped into the paver and immediately spread and struck-off to the width required and to such appropriate loose depth that, when the work is completed, the required thickness will be obtained.
In areas too small for or inaccessible to a paver, the course may be spread by band methods as directed by the Village Engineer.
Binder and top courses shall be placed in such a manner as to overlap the joints formed by two paving passes being made side by side in the preceding course.
Immediately after the bituminous mixture has been spread, struck-off and surface irregularities adjusted, it shall be thoroughly and uniformly compacted by rolling. All courses shall be initially rolled with the roller traveling parallel to the center line of the pavement, beginning from the outside edge towards the roadway's center line.
Rollers shall move at a slow and uniform speed. Any displacement occurring as a result of the reversing of the direction of a roller or from other causes shall be corrected at once by the use of rakes and the addition of fresh mixture as required. To prevent adhesion of the mixture to the rollers, the wheels shall be kept properly moistened with water or water mixed with small quantities of detergent or other approved material, but in no case shall a solvent having an effect upon the bituminous pavement be used. Suitable means shall be provided to keep pavers and other equipment and tools free from bituminous accumulations. The surface of the pavement shall be protected from drippings of oil, kerosene or other materials used in paving and cleaning operations.
The contractor has the choice of three options for compacting bituminous mixtures.
The contractor may use a vibratory roller for compaction. This roller must make two vibrating passes and two static passes and operate at a uniform speed that does not exceed 2 1/2 miles per hour (200 feet per minute).
The contractor may use a ten-ton tandem roller for compaction, but the number of passes will be determined by the Village Engineer.
The contractor may use any method agreed upon by the Village Engineer.
Any mixture that becomes loose and broken, mixed with dirt or is in any way defective shall be removed and replaced with fresh hot mixture. This shall be compacted to conform to the surrounding areas. Any area showing an excess or deficiency of bituminous material shall be corrected to the satisfaction of the Village Engineer.
The thickness of pavement may not vary more than 1/4 inch for any type of mixture less than four inches thick. Any type of mixture four inches or more thick shall not exceed a tolerance of 1/2 inch. The surface of any mixture shall not vary more than 1/4 inch from the proposed pavement height.
Any joint in a pavement layer shall be formed in such a manner as to expose the full depth of the course for the next run. Whenever existing pavement edges have become ragged, they shall be scored and cleared so that there is a neat, straight vertical edge.
Along forms, curbs, headers, walls and other areas not accessible to the rollers, a hand tamper or any other device agreed to by the Village Engineer may be used to compact the pavement material.
On depressed areas (trenches, etc.), a trench roller or small vibratory roller or any other method approved by the Village Engineer may be used to compact new pavement.
Delivery tickets showing the date, the name of the producer, the name of the project, the type of mix and the weight of the delivered material are to be supplied to the Village Engineer for all asphalt concrete installed on a particular project.
All manholes, valve covers, etc., are to be carefully adjusted to final grade and adequately covered prior to the final paving to prevent clogging or burial by the final course.
Portland cement concrete curbs shall be constructed on both sides of the street to the dimensions and specifications shown on the standard detail. The minimum compressive strength of the concrete shall be 4,500 pounds per square inch in 28 days. The concrete shall be finished and cured to the satisfaction of the Village Engineer in accordance with the general specifications for concrete found elsewhere in these specifications.
Editor's Note: The standard details and drawings are included in an attachment to this chapter.
The developer shall, at his own expense, replace any curbing which proves defective or which is damaged by his operations before the road is dedicated to the Village.
The developer shall construct four-inch-thick reinforced portland cement concrete sidewalks at a minimum width of four-foot-long sections placed on a four-inch (compacted thickness) base of 3/8-inch to 3/4-inch crushed stone or washed gravel, washed sand or selected granular fill. Prior to the placement of the base stone, the subgrade shall be thoroughly compacted with the largest practical roller or vibratory compactor to the satisfaction of the Village Engineer. Roots, stumps, stones over six inches in diameter or soft or wet earth are not permitted in the subgrade. Particular attention shall be paid to the compaction of utility trenches. The sidewalk reinforcement shall be No. 6 gauge six-inch-by-six-inch steel mesh placed two inches from the bottom of the sidewalk slab. Construction joints having 1/4-inch cellulose or similar material shall be placed at twenty-foot intervals. The edges shall have a 1/4 radius.
The concrete slabs in driveway ramps and sidewalks under driveways shall be six inches thick.
The concrete in sidewalks shall have a minimum compressive strength after 28 days of 4,500 pounds per square inch and shall be placed in accordance with the general specifications for concrete found elsewhere in these specifications.
All concrete shall have a minimum cement factor of 705 pounds (7.5 sacks) per cubic yard and shall attain a minimum compressive strength of 4,500 pounds per square inch in 28 days. Air entrainment shall be 6%, plus or minus 1%.
The concrete shall be placed at a maximum slump of four inches.
Ready-mixed concrete conforming to ASTM C-94 shall be used on all work unless otherwise permitted by the Village Engineer.
Discharge of the concrete shall be completed within 1 1/2 hours after the introduction of the mixing water to the cement and aggregate or the introduction of the cement to the aggregates.
Placing and curing concrete.
Water is to be removed from excavations.
Forms shall be coated with an approved form oil.
Thoroughly predampen all subsoil before placing concrete.
Deposit concrete in its final position, as nearly as possible, to avoid segregation.
All concrete shall be consolidated by internal vibration or spading.
Upon removal of the forms and/or final finishing, all concrete curbing, gutters and sidewalks shall be sprayed with one coat of curing compound and covered with damp burlap for 48 hours minimum. The contractor shall submit samples and manufacturer's specifications for approval of the compound. The compound shall be delivered in containers with the seals unbroken and stored in a dry place. The curing compound shall conform to Type 1-D liquid compound with fugitive dye, conforming to ASTM C-309, and shall be applied at the manufacturer's recommended rates.
Concrete for curbs, gutters and sidewalks placed between October 1 and April 1 should not be subjected to deicing salts for a period of at least six months. If this cannot be avoided, the concrete should be protected by additional application of curing compound or other sealer to seal the surface as thoroughly as possible from penetration of salt brine during the freeze-thaw cycle.
Concrete not to be subjected to deicing salts but placed during cold weather must be heated to a minimum of 60° F. and rising and protected for 72 hours at 50° F. to prevent freezing. It shall not be placed on frozen base.
Final finishing must be delayed until water sheen has disappeared from the surface; do not work bleed water into the surface; do not dust with cement to soak up excess surface water; do not add water to the surface or overwork the surface. Brooming should be delayed until the concrete surface has stiffened sufficiently to permit the desired texturing.
Finished concrete shall be sealed after curing by applying two coats of boiled linseed oil thinned with mineral spirits. The concrete surface must be completely dry before application. It is recommended that the first coat be applied 90 days after the pour and the second coat one year after the pour. A deposit with the Village must be made in lieu of the second coat if the developer offers dedication of the street prior to the application of the second coat.
After the wearing course of pavement has been placed, monuments shall be placed in the road center line at each point of curvature, point of intersection, point of tangency and at center-line intersections of intersecting streets, Monuments shall be railroad spikes or similar iron devices at least six inches long with one-half-inch minimum square shanks and one-inch minimum diameter heads. Reference ties from at least three permanent locations (house corners, preferably) shall be recorded. The surveyor shall prepare a certified map showing the locations of the monuments and reference ties and file two copies with the Village Engineer, who shall submit the same to the Planning Board for its determination as to sufficiency by holding a hearing. If the Planning Board finds this map sufficient, it shall then be filed with the Village Clerk. These monuments are in addition to the monuments required on the right-of-way line by the Planning Board as part of the subdivision approval.
Upon completion of the public improvements, the surveyor shall prepare a survey map of the street(s), showing as-built elevations of the street center line; top-of-grate and invert elevations of all storm drains and sanitary sewers; sizes, locations and types of pipes; locations and sizes of any underdrains; and locations and grades of open channels. The surveyor shall obtain record information on all underground utilities, including electricity, telephone, gas, water, sewer and cable television connections, and show the locations of these utilities with due notice concerning those which are not the result of the surveyor's own field locations. Two sets of these drawings shall be filed with the Village Planning Board, which shall hold a hearing to determine their sufficiency. If the Planning Board finds them sufficient, they shall be filed with the Village Clerk.
Twenty-four hours' minimum notice shall be given to the Village Engineer before any work covered under these specifications commences. Where grade sheets are required, one copy shall be delivered to the Village Engineer 24 hours before work commences.
The following is a list of requirements to be imposed by the Village prior to a developer offering any road for dedication to the Village:
A licensed professional engineer must prepare the infiltration/exfiltration tests and results submitted to both the Rockland County Sewer District No. 1 and the Town of Ramapo Highway Department and submit proof of compliance to the Village.
A letter from the Town of Ramapo should be required to be submitted to the Village. Said letter should indicate that the town has inspected the sewer within the last 60 days and finds it acceptable as to design standards.
An inspection should be made, within the last 60 days, of the storm drainage structures in order to ascertain that each catch basin has been properly constructed, that the grates have been properly set on the top of the structure(s) and that the catch basin(s) is (are) clean and not silted up.
Any headwalls that have been constructed as part of the storm drainage system must also be inspected, and the details required for their construction must be in place and acceptable.
Concrete curbs and sidewalks should be inspected by the Village Engineer at a minimum of 60 days prior, and a letter is required from said Engineer, indicating that all of the curbs are in place and have not buckled nor spalled.
Letters should be required from all of the utility companies (the cable television, Orange and Rockland utilities, Spring Valley Water Company and telephone companies) indicating that all underground utilities required for the road and subdivision have been placed and tested and are in good operating condition, thereby not requiring digging up of the street for repair(s) for a period of five years, other than for emergencies.
As part of the installation of curbs and sidewalks, a testing lab report is required for each one of the items that is placed to indicate a seven-day and twenty-seven-day design strength of the concrete (for every 25 cubic feet of concrete).
The asphalt pavement must be tested and reported as to compliance with the design specifications for the road(s). The asphalt must also be tested for each 40 tons placed. In lieu of this testing procedure, the Village should reserve the right to have the contractor, at selected locations, take samples of the placed material(s) and have them tested. This procedure would only apply for installations that have not been inspected by the Village and that cannot comply with the testing requirements at the time of placement of the material.
The contractor or developer should provide a list to the Village of all subcontractors that have worked on the project, together with a release signed by each of the subcontractors provided to assure that all work has been paid for and no liens are placed on the particular project.
Editor's Note: Forms for the release of contractors and affidavits for public improvements are on file in the office of the Village Clerk.