[Amended 5-16-2022 ATM by Art. 26]
All street opening work and materials used therein must conform to the Massachusetts Department of Transportation's (MassDOT) Standard Specifications for Highways and Bridges, and with the Americans with Disabilities Act (ADA) and the Architectural Access Board Regulations as currently in effect. In addition, the following specific requirements also apply. Exceptions to these requirements may be made in the discretion of the awarding authority or awarding authority representative at the time that the street opening work is in progress.
A. Excavation. Existing pavement shall be saw cut in neat, true lines along the area of the proposed excavation. Unstable pavement shall be removed over cave-outs and breaks and the subgrade treated as the main trench. Pavement edges shall be trimmed to a vertical face and neatly aligned with the center line of the trench. Cutouts beyond the limits of the trench lines must be normal or aligned parallel to the center line of the trench. Excavations shall be made in open cut. Trenches and excavations shall be braced and sheathed in accordance with the requirements of the Occupational Safety and Health Administration (OSHA). Sections of bituminous or cement concrete sidewalks shall be removed to the nearest score line or approved cut edge.
B. Backfilling and compaction.
(1) Excavations shall be filled with approved backfill. Approved backfill consists of either controlled density fill, suitable excavated material or gravel meeting M 1.03.0 or M 1.03.1 of the Standard Specifications. The permit holder may select which of these three to use in the excavation. "Suitable excavated material" shall mean previously excavated granular material but which does not include blacktop, clay, silt, organic material, concrete, roots, boulders or stones larger than four inches in diameter. If the hole is to be filled with suitable excavated material, a backfill course shall be placed in approximately twelve-inch lifts of maximum compaction to four inches below asphalt grade (see Standard Construction Details 1, 2, and 3). A base course consisting of four inches of processed gravel or equivalent (i.e., suitable excavated material containing no stones larger than 1 1/2 inches in diameter) shall then be placed on top of the backfill course. The backfill and base course shall be compacted to not less than 95% of maximum dry density as determined by the Modified Proctor Test in accordance with ASTM 1557 Method D. The permit holder if directed by the awarding authority or its representative will retain at its expense a professionally qualified geotechnical consultant to perform this test. The results of this test shall be given to the Highway Superintendent.
(2) If controlled density fill is used as backfill material, it must contain a minimum of 250 pounds of Class F fly ash or high air (25% plus) and be self-leveling. It must be Type 1E or 2E (very flowable). Flowable fill is to be batched at a ready-mix plant and is to be used at a high or very high slump (one inch to 12 inches). In lieu of the slump test, a six-inch-long, three-inch-diameter tube may be filled to the top and then slowly raised. The diameter of the resulting "pancake" may be measured and the range of the diameter shall be nine inches to 14 inches. It shall be flowable, require no vibration and after it is placed excavatable by hand tools and/or small machines.
(3) The ingredients shall comply with the following:
Portland cement | AASHTO M85 |
Fly ash | AASHTO M 295 Class F |
Sand | M 4.02.02-ASTM C33 sand |
Air | M4.02.05 |
(4) Type 1E and 2E must meet the following requirements:
Compressive | 28 days | 90 days |
Strength | 30 to 80 psi | 100 psi ma. |
Slump | | 10 to 12 inches |
Air | | 1% to 30% |
(5) If controlled-density fill is used as backfill material, it must fill the excavation to immediately below asphalt grade. The contractor must then plate the excavation with a heavy-duty steel plate adequate to carry heavy traffic and wait 24 hours for the controlled density fill to cure prior to applying the permanent patch.
(6) If an excavation is backfilled with controlled-density fill in accordance with this bylaw, then a temporary patch need not be installed but a permanent patch may be installed immediately. Permanent patches installed over controlled-density fill shall consist of four inches of bituminous concrete applied in a two-and-one-half-inch base course and a one-and-one-half-inch top course of bituminous concrete all installed in accordance with this bylaw. If an excavation in a cement concrete public way is filled with controlled-density fill, then the provisions of Subsection
E(1) of this section may be omitted, but the provisions of Subsection
E(2) and
(3) must be complied with.
C. Temporary patches.
(1) Bituminous concrete. Following proper compaction, a temporary patch, which shall be the thickness of the existing asphalt pavement or a minimum of four inches, whichever is greater, shall be applied. It shall consist of either cold patch or bituminous concrete plant-mixed hot asphalt aggregate. (See standard construction details.)
(2) Temporary patch to be maintained for one year. A temporary patch that has been backfilled and compacted shall be maintained by the permit holder or contractor so that the patched surface and the surrounding area remain a single smooth unbroken plane for a period of time no shorter than one year after placement of the temporary patch.
D. Permanent patches.
(1) Except when installed over controlled density fill as described in Subsection
B above, permanent patches shall be installed not less than 12 months nor more than 18 months from the date of installation of the temporary patch. Upon request by the permit holder or contractor, the awarding authority representative will inspect the temporary patch and determine if final settlement of the trench has occurred. The awarding authority representative will notify the permit holder or contractor within seven days of the inspection whether the permanent patch can be installed. Public utilities or municipal departments may schedule permanent patches to replace all temporary patches then within the permanent patch window without receiving prior approval from the awarding authority but must give the awarding authority and its representative not less than 72 hours' prior notice.
(2) A permanent patch shall consist of one of the following:
(a) Cold planing the temporary patch to a depth of 1 1/2 inches and then installing a minimum of 1 1/2 inches of top course of bituminous concrete; or
(b) The excavation of the temporary patch in a bituminous concrete public way and replacement of this material with any additional processed gravel needed and 2 1/2 inches of base course and 1 1/2 inches of top course of bituminous concrete (see Standard Construction Details 1 and 2); or
(c) Application of the infrared process to the temporary patch; or
(d) The certification by the awarding authority representative made during the permanent patch window that the temporary patch in his reasonable judgment meets fully the standard of a permanent patch and thus requires no further work.
(3) Cold planing. If the cold planing method is used, the area to be cold planed must extend at least 12 inches beyond all sides of the existing temporary patch. (See Standard Construction Detail 2.) This area must be cold planed to a depth of 1 1/2 inches. Any broken or irregular edges of existing pavement shall be cut away in straight lines leaving a sound vertical face at least 12 inches back from all edges of the existing pavement. The permit holder must provide a dust-control system capable of complying with environmental air quality standards during cold planing and sweep the public way following completion of the cold planing work. All abutting edges of the existing pavement will be painted with an asphalt emulsion immediately prior to the placement of the permanent patch. The permanent patch will consist of the application of a top course of a minimum of 1 1/2 inches of bituminous concrete plant-mixed hot asphalt aggregate. After raking and rolling, the grade of the permanent patch shall match the existing bituminous surface of adjacent pavement The finished permanent patch shall be level, having no depressions retaining water on any of the surface. All seams of the finished perimeter shall be sealed with penetrating asphalt emulsion.
(4) Excavation.
(a) Any temporary patch that has been patched with cold patch must be excavated and replaced with a bituminous concrete base in accordance with this subsection. If the excavation method is chosen and if additional cutting of the existing pavement is required, it shall be done in neat straight lines. Any broken or irregular edges of existing pavement shall be cut away in straight lines leaving a sound vertical face at least 12 inches back from all edges of the existing pavement. (See Standard Construction Details 1 and 3.) All abutting edges of the existing pavement shall be painted with an asphalt emulsion immediately prior to the placement of the permanent patch. The permit holder or contractor shall remove and dispose of all excavated material and thoroughly compact the surface of the subbase.
(b) Following excavation, the permanent patch shall consist of a bituminous concrete base and top laid and rolled in two courses. The binder (base course) shall be a minimum of 2 1/2 inches in depth, and the top course shall be 1 1/2 inches in depth. The minimum total thickness of both courses, measured after rolling, shall be four inches or equal to the material that was previously excavated. If after compaction more than four inches of permanent patch is needed in order to restore the excavated area to finish grade, additional bituminous concrete shall be used in the base course. The base course shall be placed and carefully raked and thoroughly rolled to the required thickness. The top course shall be placed to a grade that will match the existing bituminous surface after rolling. All seams of the finished perimeter shall be sealed with penetrating asphalt emulsion. The finished permanent patch shall be level having no depressions retaining water on any of the surface.
(5) Infrared process.
(a) If the infrared process is utilized to install the permanent patch, the area to be repaired shall be thoroughly cleaned to eliminate all potential contaminants. An infrared heater shall be positioned over the area to be repaired for a period of time required to plasticize the existing pavement to a depth of 1 1/2 inches. Oxidation of the pavement caused by improper heating techniques must be avoided. If this condition occurs, all oxidized material must be removed and replaced with Class I bituminous concrete meeting the Standard Specifications of the Massachusetts Highway Department.
(b) The softened area shall be inwardly reworked from approximately one foot beyond all sides of the original temporary patch. This designated area shall be treated with a penetrating asphalt emulsion, uniformly scarified and raked to a workable condition. For street crossings and/or trenches with jogs, the reworked area will be extended beyond the outermost jog in a straight line parallel with the opposite outermost jog. Under no circumstances may the infrared heat treatable patching mix that is used register a temperature under 200° F.
(c) After the paving mixture has been properly admixed and raked to grade, compacting shall be obtained by use of a steel-wheeled roller of sufficient weight to establish a uniform density comparable to that of the surrounding pavement surface within the work area. The finished permanent patch shall be level, having no depressions retaining water on any of the surface. All seams of the finished perimeter shall be sealed with penetrating asphalt emulsion.
(d) A petroleum resin sealant shall be applied consistently to the entire heated area by mechanical means or hand application at an approximate rate between 0.1 gallon and 0.25 gallon per square yard. Actual rate will be determined on site by an approved absorption test method. A mineral filler will then be broadcast over the newly sealed area to absorb any excess liquid and prevent tracking and the area immediately opened to traffic.
(6) Certification. If a permit holder seeks to qualify a temporary patch as a permanent patch, it must make the application for inspection set out above and specify in it its request for certification. The awarding authority representative will notify the permit holder within 30 days of the request whether the temporary patch has been certified as a permanent patch. If it is not so certified, the permit holder shall forthwith cause a permanent patch utilizing one of the three remaining methods set out above to be utilized.
(7) Newly paved roads. On newly paved roads, the awarding authority representative may require, in addition to the placement of the permanent patch, that the permanent patch shall be treated by a process (infrared, microwave or equivalent) that will ensure that the permanent patch is integrated into the existing bituminous surface in a seamless manner.
(8) Final inspection of permanent patch. Following completion of the permanent patch, the permit holder or contractor shall give notice thereof to the awarding authority representative, who shall inspect the permanent patch. If the awarding authority representative is satisfied that the road has been restored to as good a condition as existed prior to the street opening work, he shall so note on the street opening permit and any refundable deposit securing that street opening work shall be refunded promptly to applicant. If the awarding authority representative determines that the permit holder is in default, the awarding authority may proceed in accordance with §
298-16, Remedies, of this bylaw.
E. Special rules for cement concrete roadways. Any excavation in a cement concrete public way or public way with a cement concrete base with a bituminous concrete surface shall be backfilled as described in Subsection
B and temporarily patched as described in Subsection
C. Immediately prior to the installation of a permanent patch, the following shall be done:
(1) The temporary patch and sufficient backfilled material shall be removed.
(2) A six-inch reinforced concrete slab shall be laid over the backfilled trench, extending one foot beyond all edges of the trench surface and allowing for four inches of bituminous concrete to be installed above the slab. The slab shall have steel reinforcing for tensile strength in accordance with good engineering practices. The permit holder or contractor shall install a temporary heavy-duty steel plate adequate to carry heavy traffic over the trench until the concrete slab shall have adequately cured.
(3) Once the concrete slab shall have cured, there shall be installed a four-inch layer of bituminous concrete applied in a two-and-one-half-inch base course and a one-and-one-half-inch top course all in accordance with Standard Construction Detail 3 and generally in accordance with this bylaw.
F. Shoulders. Suitable excavated material shall be placed in layers not to exceed six inches in depth and compacted. Shoulders shall be reconstructed to their existing condition and either loamed with six inches of loam, limed, fertilized and seeded with roadside grass mix or covered with four inches of wood chips as directed by the awarding authority representative.
G. Sidewalks. Any excavation in a concrete or bituminous concrete sidewalk shall require that the entire sidewalk area containing the trench be replaced. Any concrete sidewalk section that is excavated or damaged by the excavation must be replaced in its entirety. Suitable excavated material or gravel shall be placed in layers not to exceed six inches in depth and compacted. All sidewalk areas will be installed by the permit holder or contractor in conformance with the ADA and the Architectural Access Board Regulations currently in effect. Bituminous concrete sidewalks shall have two courses (two inches of binder and one inch of top) of bituminous concrete plant-mixed hot asphalt aggregate applied to and rolled to create a pavement surface consistent with the adjacent bituminous concrete surface. Concrete sidewalks shall have four inches of poured concrete applied to finish grade. The concrete shall be placed in alternate slabs nine meters in length except as otherwise ordered. The slabs shall be separated by transverse, preformed expansion joint filler 13 millimeters in thickness. Concrete driveway openings shall have six inches of poured concrete applied to finish grade. Preformed expansion joints will be installed against buildings, walls, steps, foundations or existing concrete block.
H. Curb and berm. Any curbing or berm which is damaged or removed as part of the street opening work shall be properly replaced in kind. The use of cast-in-place concrete curbing is prohibited. All salvageable granite curb that is removed from the public way and is excess is the property of the Town and shall be delivered to the Highway Department by the permit holder or contractor.
I. Wheelchair ramps. Existing wheelchair ramps which are damaged or removed under street opening work shall be reconstructed in kind and in conformance with the ADA and the Architectural Access Board regulations that are currently in effect.
J. Curb cuts.
(1) Any curb cut within a public way cannot exceed the following dimensions unless specifically approved by the awarding authority representative:
(a) Single-family dwelling: 16 feet.
(b) Multifamily dwelling: 18 feet.
(c) Two-family dwelling: 18 feet.
(d) Commercial property: 24 feet.
(2) Driveway entrances into public ways must butt into and not overlap the edge of the existing roadway hardened surface. The driveway must be graded in such a manner that no ponding of water occurs within the public way and in accordance with the Architectural Access Board regulations. Driveways shall not be located on small radius curves and shall be positioned as to provide maximum sight distance and safety.