The text
I. Safety requirements.
The developer shall provide safe and convenient access to all parts of the development that require inspection. The developer shall comply with the rules and regulations promulgated by U.S. Occupational Safety and Health Administration (OSHA), Dig Safe and all other relevant federal and state agencies. All work related to the development shall be done so as to avoid hazard, damage or inconvenience to adjoining property owners and to the public.
II. Street construction and utility extension.
a.
Clearing and grubbing. The area within 6.5 feet from the edge of the curbing or Cape Cod berm, as shown on the plan or plat, shall be cleared and grubbed. All trees not intended for preservation, and all root systems, stumps, bushes and other objectionable material, shall be removed and disposed of, followed by removal of all loam and other yielding material prior to excavation and grading. Additional clearing may be required under special circumstances. Compliance with the approved soil erosion and sediment control plan for the development is required.
b.
Subgrade.
(1)
Where objectionable materials are encountered to a greater depth than anticipated, the developer shall remove said materials.
(2)
The subgrade shall be thoroughly compacted prior to grading or placement of any fill material.
(3)
The developer shall provide and maintain grade stakes at a minimum of one foot off of the edge of pavement at all 50-foot stations, prior to the placement of any fill on the subgrade or placement of the gravel base.
(4)
The director of public works will require a minimum of two compaction tests per street, or one test every 300 feet, whichever is greater. Test locations shall be determined and witnessed by the director of public works, town engineer or their designee. Compaction must be at 95 percent. The costs for undertaking the tests shall be borne by the developer.
(5)
When a pipe is to be laid in unstable material, as determined by the director of public works or town engineer, the unsuitable material shall be removed and replaced with a bedding of gravel or crushed stone to the specifications of the director or town engineer.
(6)
In locations where high groundwater is encountered, or where in the opinion of the director of public works or town engineer it may be encountered, or in wet spongy areas, subdrains shall be required. The director or town engineer may, upon visual inspection of field conditions, require that additional subdrains be installed during construction.
c.
Backfill of trenches.
(1)
The backfill of trenches within the pavement areas and sidewalk areas, where applicable, shall be done in layers not exceeding 12 inches in thickness, and shall be thoroughly moistened. Each layer shall be tamped with a mechanical tamper to the satisfaction of the director of public works or town engineer.
(2)
All material used for the backfilling of the street subbase shall be subject to the inspection and approval of the director of public works or town engineer; under no circumstances shall frozen material be used for backfilling.
(3)
Bedding materials and methods for utility extension shall be as determined by the appropriate utility. A minimum of 12 inches of select material, with stones no larger than 1½ inches, shall be placed over and on the sides of each utility line.
(4)
All utility trenches shall be backfilled a minimum of 30 days prior to the placement of the gravel base, unless waived by the director of public works or the town engineer.
d.
Gravel.
(1)
Bank run gravel, processed gravel or recycled road base material of a quality acceptable to the director of public works or town engineer shall be placed within the street pavement area to a total depth of 12 inches.
(2)
After the subbase has been properly prepared and the curbs and shoulders set, the base course of bank run gravel shall be spread for the full width and in such volume as to provide an eight-inch cross section after compaction with a ten-ton roller or equivalent.
(3)
Where bank run gravel or recycled road base material is used, processed gravel conforming to the requirements of subsection M.01.09, table I, column II, of the Rhode Island Department of Transportation (R.I. DOT) Standard Specifications for Road and Bridge Construction shall be placed within the street pavement area to an average depth of four inches and thoroughly compacted.
(4)
The director of public works will require a minimum of two tests per street, or one test every 300 feet, whichever is greater, for gradation and compaction of the gravel to ensure compliance with the R.I. DOT standard specifications. Test locations shall be approved by the director or town engineer. The costs for undertaking the tests shall be borne by the developer.
e.
Bituminous concrete.
(1)
Seasonal limits. Bituminous concrete shall be placed between the dates of April 1 and November 15, as weather conditions permit, unless waived by the director of public works or town engineer and approved by the planning board. Air and ground temperatures must be at least 35 degrees Fahrenheit and rising for bituminous concrete placement. Paving shall never be permitted on frozen or water-soaked services [surfaces].
(2)
Binder course. The binder course shall consist of bituminous concrete pavement (hot mix) class I, type I-1, conforming to the requirements of subsection M.03.06 of the R.I. DOT standard specifications. The binder course shall be applied at a temperature between 250 and 350 degrees Fahrenheit by means of an approved paving spreader. Such material shall be placed in sufficient quantity to provide a minimum compacted cross section of two inches. The binder course shall be compacted as specified in section 401.03.11 of the R.I. DOT standard specifications.
(3)
Surface course. The surface course shall consist of an application of bituminous concrete pavement (hot mix) class I, type I-1. The binder course shall first be swept clean of all sand and debris. Ripples or unevenness in the surface shall be brought back to true line and cross section by the spot application and proper compaction of class I mix. The surface course shall be applied at a temperature between 250 and 350 degrees Fahrenheit by means of an approved paving spreader. Such material shall be placed in sufficient quantity to provide a minimum compacted cross section of 1½ inches. The surface course shall be compacted as specified in section 401.03.11 of the R.I. DOT standard specifications. Upon completion of the application and compaction of the surface course, the street shall be allowed to stand for a minimum of eight hours without traffic.
(4)
Manholes and catchbasins. If the surface course will not be applied within 90 days following placement of the binder course, sanitary and storm sewer manholes shall be installed so that the tops are at the binder course grade level.
(5)
[Core borings.] The director of public works, or town engineer, may require a core boring every 300 feet of the pavement, if in the opinion of the director or town engineer, respectively, the integrity of the bituminous pavement is less than desired. The cost of this process, and pavement repair, shall be borne by the developer.
(6)
[Proof of delivery of concrete.] A delivery ticket from an automatic printer system shall be supplied to the director of public works or his designated inspector for each load of bituminous concrete, or portion thereof, delivered to the development and placed.
f.
Sidewalks and pedestrian ways. Sidewalks shall be constructed of 4,000 pounds per square inch concrete with three-quarter-inch aggregate, 610 pounds per cubic yard cement, and seven percent air entrained content. The depth of the concrete shall be four inches minimum, except at driveways, where it shall be a minimum of six inches. Gravel under sidewalk shall be eight inches compacted. Where pedestrian ways are required to be paved, they shall be constructed of two-inch bituminous material over a six-inch gravel base.
g.
Water service. The water shutoff shall be marked at the property line for every lot. Marker posts shall be oak or pressure treated wood a minimum of two inches by four inches, placed a minimum of 12 inches into the ground and exposed a minimum of 24 inches above the ground. Marker posts shall be painted blue and shall be in place for final inspection.
III. Storm drainage facilities.
a.
The State of Rhode Island Stormwater Design and Installation Standards Manual covering the design and construction and maintenance of structural BMPs such as wet ponds, extended detention ponds, infiltration practices, pretreatment devices, infiltration basins, infiltration trenches, dry wells and vegetated filter strips are incorporated by reference into these construction standards.
b.
All storm drainage structures and facilities, including culverts and storm drains, manholes, inlets and catchbasins, underdrains and paved waterways, shall conform to the drainage section of the R.I. DOT standard specifications.
c.
All catchbasins shall be designed as vertical drains. Catchbasins shall be built on both sides of the street on continuous grades such that surface water will not run along the edge of the pavement for a distance of more than 300 feet, at low points and sags in the street, and at intersections.
d.
Drain pipes shall be located when possible approximately one foot from the nearer edge of the pavement, and shall be laid in straight segments. Manholes shall be required at all changes in direction or grade, and at all pipe connections from catchbasins or other drains.
e.
Drain pipes shall be laid at a slope of not less than one percent nor greater than ten percent, and there shall be a minimum of 24 inches of fill between any reinforced concrete pipe and the finish grade. Storm drain pipes shall have a minimum diameter of 12 inches, and subsurface drainage system pipes shall have a minimum diameter of six inches.
f.
When vertical drains or other systems are designed to introduce stormwater into the ground, the leaching system shall be wrapped with a nonwoven filter fabric to prevent fine materials from being carried between the washed crushed stone and surrounding materials.
g.
All detention and filtration systems shall be designed so that the bottom of any such facility is elevated at least one foot above the elevation of the highest groundwater table. Groundwater elevation tests, as conducted by the director of public works or town engineer, will be undertaken in any detention basin and in critical areas of road construction, to determine the highest groundwater elevation.
h.
Water collected from an on-site drainage system will be detained and filtered through manmade detention and filtration systems before discharging into the town drainage system, unless waived by the director of public works or town engineer and approved by the planning board.
i.
All manmade embankments shall be completely cleared of organic matter and shall consist of clean inorganic fill. Detention area embankments shall be properly compacted with maximum side slopes of three feet horizontal to one foot vertical. The interior side of the embankment shall not exceed six feet in height from the bottom of the detention area to the top. The embankment shall be covered with a minimum of four inches of loam and seeded. The engineer is encouraged to design basins and embankments that make use of existing topographic features.
j.
All new open watercourses will be seeded, sodded or paved, or riprapped, depending on grades and soil types.
k.
Where volume velocity of the surface runoff is high, the flow thereof shall be controlled by riprap, sediment basins, flow spreaders or other applicable devices and/or techniques recommended in the Rhode Island Soil Erosion and Sediment Control Handbook and the State of Rhode Island Stormwater Design and Installation Standards Manual.