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Typical Construction Sequence
Construction Stakeout
The contractor's surveyor will stakeout proposed features of the project using various forms of field markers, including but not limited to wooden stakes, PK nails, ribbon, flags, and paint. The surveyor will set field markers to locate proposed storm drain inlets, right of way centerline, face of curbing, grade stakes to show proposed elevations for the roadway, etc.
Please note that stakes are usually located relative to an offset distance away from the proposed feature that it refers to. This protects the stake from being disturbed during construction activity.
Mobilization
The contractor will move construction equipment to the site. Usually, the equipment will remain on-site for extended periods during the project duration and used as needed. In addition, the contractor may stockpile material (precast storm drain inlets, curbing, storm drain piping, stone, etc.) on-site and use material as needed.
The contractor may ask permission from property owners to park construction equipment or store material on private property. Any requests by the contractor to use private property are entirely a matter between the contractor and the property owner. The city will assume no responsibility for any damage resulting from the contractor's permitted use of private property.
Relocation of Existing Utilities
Any utilities such as gas and water lines, utility poles, overhead and underground power, cable, and telephone that interfere with proposed features of the project will be relocated by each respective utility owner.
Installation of Proposed Storm Drain System
The contractor will install all components of the proposed storm drain system including storm drain inlets with frames and grates, manholes, and storm drain pipes. The installation will involve excavation for the inlets and the piping, temporary stockpile and removal of the excavated material, installation of the inlets and piping, and backfilling with select backfill (stone). In addition, the contractor may excavate large holes, or test pits in the existing roadway to verify elevations of existing utilities to ensure that any proposed storm drain pipes will not conflict with them.
Roadway Excavation
The contractor will remove the existing roadway. The roadway excavation will involve removal of the roadway, existing inlets (if needed) and driveway culverts, and additional excavation to bring subgrade down to proposed subgrade elevations. The contractor will install temporary stone to maintain traffic as necessary.
Installation of 6" Stone Sub-Base
When the correct subgrade elevations are obtained via roadway excavation, the contractor will install 6" of stone subgrade everywhere that the existing roadway was removed. The stone provides bearing support for the asphalt base course.
Installation of 2 1/2" Bituminous Concrete Base Course
The contractor will construct the asphalt base course over the 6" stone sub-base. The asphalt base course will provide support for the surface course. Please note that the newly installed storm drain inlet grates will protrude above the asphalt base course, allowing for the installation of the surface course to be flush with the top of grates. Typically, traffic can enter paved areas immediately after final rolling of the base course.
Pavement Widening for Overlay
The contractor will widen the portions of the street that were not excavated during roadway excavation for reconstruction and that are not currently at proposed width. The widening will involve saw-cutting the existing edge of pavement on both sides of the road, removing approximately 10" of existing roadway material outside of the saw-cut to approximately 1 foot beyond the proposed face of curb, replacing the aforementioned excavation void with 6" stone subgrade and 4" of asphalt base course. The widened area and the existing roadway surface will provide the bearing surface for the wedge/leveling and surface overlay course.
Patch Existing Pavement for Overlay
The contractor will install pavement patching over the exposed stone at the trenches of recently constructed utility lines. The patching will consist of removing stone from trench to obtain proper depth for placement of 6" stone subgrade and 4" asphalt patch. The asphalt patch and the existing roadway will provide bearing support for wedge/leveling and surface overlay course. In addition, any locations on the existing roadway where the existing pavement has failed will be removed and patched as described above.
Installation of Wedge/leveling Bituminous Concrete for Overlay
The contractor will install asphalt wedge/leveling course over the proposed overlay portions (portions of roadway that were not excavated during roadway excavation). The wedge/leveling asphalt, or scratch course will be a thin layer of asphalt to bring the existing roadway to the correct cross slope, and smooth the road profile. Pronounced high spots on the existing roadway surface will be removed by milling equipment, which will help reduce wedge/leveling quantities.
The installation of the wedge/leveling course and its tie-in to the 2 ½" base course (constructed in the reconstruction portion) will allow the installation of a smooth continuous surface course over the entire limits of the project. Typically, traffic can enter wedge/leveling areas immediately after final rolling.
Installation of 1 1/2" Bituminous Concrete Surface Course
The contractor will install the final asphalt surface course over all road surfaces. Typically, traffic should not enter paved areas for at least 1 hour after final rolling of the surface course.
Installation of Precast Concrete Curbing
The contractor will install 3 foot sections of precast concrete curb on top of the 1 ½" surface course on both sides of all streets. The face of curb will be located approximately 1 foot inside of the edge of the surface course, giving a face-of-curb to face-of-curb roadway width of 26 feet on all streets. The 6" high curb sections are interlocking and are secured to the roadway surface with steel pins. Curbing across driveways will be drop down type which are 1 ½" high. The curbs are backfilled with stone or acceptable spoil material to a depth of 3" below the top of curb.
Rain Leaders
Existing rain leaders that drain downspouts that are affected or damaged by the construction will be extended through the face of curb where they will drain directly onto the roadway.
Topsoil
The contractor will install 3" of topsoil behind curbing to bring finished grade to top of curb. The topsoil shall meet Maryland State Highway (MD SHA) specifications; e.g., 2 inch or smaller clumps of soil or rocks are allowed in the topsoil according to the specification. Please be advised that sifted or bagged topsoil cannot be specified due to high costs, thus it is up to the discretion of the property owners to rake out topsoil to remove any undesirable rocks or clumps. Topsoil will be applied anywhere existing yards are disturbed due to construction activity. Water valves/meters elevations will be adjusted to account for the installation of topsoil.
Seeding & Mulching
All topsoiled areas will be seeded and mulched. Please be advised that it is the responsibility of the property owner to water and nurture the seeded areas to ensure the establishment of grass. The grass seed shall be Kentucky 31 Tall Fescue. Please be advised that allowances for specialty grasses, such as zoysia or ornamental grasses cannot be made, and will be the responsibility of the property owner.
Driveway Tie-Ins
Asphalt and concrete driveway tie-ins will be installed after curbing is installed. Temporary stone access will be placed at driveways as needed prior to the installation of permanent tie-ins. Please be advised that driveway tie-ins where there is a large difference in slope between the driveway and road surface require trial-and-error construction techniques to prevent vehicle dragging. Residents are encouraged to test the tie-ins with their vehicles as soon as possible. Residents must inform the construction inspector or contractor's personnel as soon as a problem becomes known.
Note: Waiting to inform us of a problem after the contractor has demobilized paving operations is too late!
Please be advised that the sequence of construction is only an approximation and is subject to change without notice. In some instances the time period in which the above listed items are performed will over lap with the time periods of other items.
The contractor's surveyor will stakeout proposed features of the project using various forms of field markers, including but not limited to wooden stakes, PK nails, ribbon, flags, and paint. The surveyor will set field markers to locate proposed storm drain inlets, right of way centerline, face of curbing, grade stakes to show proposed elevations for the roadway, etc.
Please note that stakes are usually located relative to an offset distance away from the proposed feature that it refers to. This protects the stake from being disturbed during construction activity.
Mobilization
The contractor will move construction equipment to the site. Usually, the equipment will remain on-site for extended periods during the project duration and used as needed. In addition, the contractor may stockpile material (precast storm drain inlets, curbing, storm drain piping, stone, etc.) on-site and use material as needed.
The contractor may ask permission from property owners to park construction equipment or store material on private property. Any requests by the contractor to use private property are entirely a matter between the contractor and the property owner. The city will assume no responsibility for any damage resulting from the contractor's permitted use of private property.
Relocation of Existing Utilities
Any utilities such as gas and water lines, utility poles, overhead and underground power, cable, and telephone that interfere with proposed features of the project will be relocated by each respective utility owner.
Installation of Proposed Storm Drain System
The contractor will install all components of the proposed storm drain system including storm drain inlets with frames and grates, manholes, and storm drain pipes. The installation will involve excavation for the inlets and the piping, temporary stockpile and removal of the excavated material, installation of the inlets and piping, and backfilling with select backfill (stone). In addition, the contractor may excavate large holes, or test pits in the existing roadway to verify elevations of existing utilities to ensure that any proposed storm drain pipes will not conflict with them.
Roadway Excavation
The contractor will remove the existing roadway. The roadway excavation will involve removal of the roadway, existing inlets (if needed) and driveway culverts, and additional excavation to bring subgrade down to proposed subgrade elevations. The contractor will install temporary stone to maintain traffic as necessary.
Installation of 6" Stone Sub-Base
When the correct subgrade elevations are obtained via roadway excavation, the contractor will install 6" of stone subgrade everywhere that the existing roadway was removed. The stone provides bearing support for the asphalt base course.
Installation of 2 1/2" Bituminous Concrete Base Course
The contractor will construct the asphalt base course over the 6" stone sub-base. The asphalt base course will provide support for the surface course. Please note that the newly installed storm drain inlet grates will protrude above the asphalt base course, allowing for the installation of the surface course to be flush with the top of grates. Typically, traffic can enter paved areas immediately after final rolling of the base course.
Pavement Widening for Overlay
The contractor will widen the portions of the street that were not excavated during roadway excavation for reconstruction and that are not currently at proposed width. The widening will involve saw-cutting the existing edge of pavement on both sides of the road, removing approximately 10" of existing roadway material outside of the saw-cut to approximately 1 foot beyond the proposed face of curb, replacing the aforementioned excavation void with 6" stone subgrade and 4" of asphalt base course. The widened area and the existing roadway surface will provide the bearing surface for the wedge/leveling and surface overlay course.
Patch Existing Pavement for Overlay
The contractor will install pavement patching over the exposed stone at the trenches of recently constructed utility lines. The patching will consist of removing stone from trench to obtain proper depth for placement of 6" stone subgrade and 4" asphalt patch. The asphalt patch and the existing roadway will provide bearing support for wedge/leveling and surface overlay course. In addition, any locations on the existing roadway where the existing pavement has failed will be removed and patched as described above.
Installation of Wedge/leveling Bituminous Concrete for Overlay
The contractor will install asphalt wedge/leveling course over the proposed overlay portions (portions of roadway that were not excavated during roadway excavation). The wedge/leveling asphalt, or scratch course will be a thin layer of asphalt to bring the existing roadway to the correct cross slope, and smooth the road profile. Pronounced high spots on the existing roadway surface will be removed by milling equipment, which will help reduce wedge/leveling quantities.
The installation of the wedge/leveling course and its tie-in to the 2 ½" base course (constructed in the reconstruction portion) will allow the installation of a smooth continuous surface course over the entire limits of the project. Typically, traffic can enter wedge/leveling areas immediately after final rolling.
Installation of 1 1/2" Bituminous Concrete Surface Course
The contractor will install the final asphalt surface course over all road surfaces. Typically, traffic should not enter paved areas for at least 1 hour after final rolling of the surface course.
Installation of Precast Concrete Curbing
The contractor will install 3 foot sections of precast concrete curb on top of the 1 ½" surface course on both sides of all streets. The face of curb will be located approximately 1 foot inside of the edge of the surface course, giving a face-of-curb to face-of-curb roadway width of 26 feet on all streets. The 6" high curb sections are interlocking and are secured to the roadway surface with steel pins. Curbing across driveways will be drop down type which are 1 ½" high. The curbs are backfilled with stone or acceptable spoil material to a depth of 3" below the top of curb.
Rain Leaders
Existing rain leaders that drain downspouts that are affected or damaged by the construction will be extended through the face of curb where they will drain directly onto the roadway.
Topsoil
The contractor will install 3" of topsoil behind curbing to bring finished grade to top of curb. The topsoil shall meet Maryland State Highway (MD SHA) specifications; e.g., 2 inch or smaller clumps of soil or rocks are allowed in the topsoil according to the specification. Please be advised that sifted or bagged topsoil cannot be specified due to high costs, thus it is up to the discretion of the property owners to rake out topsoil to remove any undesirable rocks or clumps. Topsoil will be applied anywhere existing yards are disturbed due to construction activity. Water valves/meters elevations will be adjusted to account for the installation of topsoil.
Seeding & Mulching
All topsoiled areas will be seeded and mulched. Please be advised that it is the responsibility of the property owner to water and nurture the seeded areas to ensure the establishment of grass. The grass seed shall be Kentucky 31 Tall Fescue. Please be advised that allowances for specialty grasses, such as zoysia or ornamental grasses cannot be made, and will be the responsibility of the property owner.
Driveway Tie-Ins
Asphalt and concrete driveway tie-ins will be installed after curbing is installed. Temporary stone access will be placed at driveways as needed prior to the installation of permanent tie-ins. Please be advised that driveway tie-ins where there is a large difference in slope between the driveway and road surface require trial-and-error construction techniques to prevent vehicle dragging. Residents are encouraged to test the tie-ins with their vehicles as soon as possible. Residents must inform the construction inspector or contractor's personnel as soon as a problem becomes known.
Note: Waiting to inform us of a problem after the contractor has demobilized paving operations is too late!
Please be advised that the sequence of construction is only an approximation and is subject to change without notice. In some instances the time period in which the above listed items are performed will over lap with the time periods of other items.