The text
The subdivider, at his own expense, shall construct improvements according to the following specifications:
1. - Streets.#
(a)
All trees, stumps, brush, boulders and other debris shall be removed from the right-of-way and disposed of according to law. The location of all stump and boulder dumps shall be located on the plat plans. Such material will not be accepted at any town-owned disposal facility.
(b)
All streets shall have a twenty-six-foot paved surface centered in the right-of-way with eighteen-inch-wide bituminous "Cape Cod" berms.
(c)
The thirty-foot road bed shall be graded to a level at least two (2) feet below the final grade.
(d)
The subgrade shall be borrow or gravel of suitable quality, free from organic material, at least twelve (12) inches in depth at the center line. Pitch from the center line to shoulder shall be five-sixteenths (5/16) inch per foot. This course shall be graded to one (1) foot below final grade of road surface.
(e)
The second course shall be gravel borrow subbase (State of R.I. specifications), six (6) inches in depth.
(f)
The third course shall be type A processed gravel three (3) inches in depth.
(g)
The fourth course shall be bituminous concrete, Class I, modified bituminous (Binder), two and one-half (2½) inches in depth. The binder course shall be in place over one (1) winter season prior to the installation of the surface course.
(h)
The fifth course shall be bituminous concrete, Class I, type 1 (surface), one and one-half (1½) inches in depth. Final pavement grade shall be five-sixteenths (5/16) inch per foot from centerline of road to shoulder.
(i)
All five (5) courses shall be separately rolled with a self- propelled roller of minimum ten-ton weight.
(j)
All pipes, water lines, or any other underground facilities shall be installed before starting road construction and shall meet all applicable state and federal requirements (Items (d) through (i)).
(k)
Any curbing required by the plan commission in lieu of berms shall be granite or approved precast concrete (Rhode Island Standard) type and shall be set on both sides of the street with a face of seven (7) inches above pavement grade at curb line.
(l)
Installation of any utility requiring disturbance of street pavement is prohibited for a period of twenty (20) years after date of acceptance by the town, except for emergencies affecting the general health of the community or by approval of the plan commission.
(m)
Final acceptance of any new street will not be made before April 1 of the year following its completion.
(n)
Normally, sidewalks will not be required. The twelve-foot area from shoulder grade to lot line shall be graded with a minimum four-inch pitch rising from curb grade to lot line and shall be covered with a minimum of four (4) inches of loam seeded with suitable perennial grass seed. Slopes outside the right-of-way shall not exceed a ratio of three (3) horizontal to one (1) vertical.
(o)
The town engineer shall have the right to inspect all materials before installation.
(p)
With respect to items (a) through (j), the subdivider shall notify the town engineer upon completion of each item and shall not proceed with the next item until the town engineer has inspected and approved in writing the work completed.
2. - Driveways.#
(a)
Driveway openings shall be predetermined and shown on plan. No new openings or changes of location shall be permitted unless a revised plan is presented and approved by the plan commission.
(b)
No driveway opening shall be within one hundred (100) feet of a major plat entrance. No driveway opening shall be offset less than twenty-five (25) feet from one on the opposite side of the street.
(c)
Construction of driveways shall be same as for road bed for twelve-(12) feet in from shoulder face. Grade shall be from gutter level at curb, rising to sidewalk grade seven (7) feet from curb face and follow sidewalk grade to lot line.
(d)
Any alterations or excavations shall be performed in accordance with plan commission specifications.
3. - Sidewalks.#
It the developer or property owner constructs sidewalks, or the plan commission requires sidewalks be installed, they must be built to the following specifications:
(a)
Sidewalks shall be forty-two (42) inches wide, located one (1) foot from the lot line with a curb or retaining wall at the lot line if required by grade of lot.
(b)
Excavation shall be eight (8) inches below shoulder grade. The base course shall be a four-inch depth of gravel borrow subbase. The second course shall be a two-inch depth of processed gravel. The surface shall be a two-inch depth of Class I, type 1, bituminous concrete. Grade shall be one and one-half inch pitch sloping down toward curb. All courses shall be rolled separately with roller of adequate size.
(c)
Unpaved area between shoulder and lot line shall be graded with four (4) inches of loam and seeded with suitable perennial grass seed.
(d)
The Town of Scituate shall not, under any circumstances, be obliged to construct sidewalks in any subdivision.
4. - Drainage.#
(a)
No drainage from homes or other structures shall be allowed to flow onto town property. Unpolluted water from underground drainage systems may, with approval of the plan commission, be piped into the storm drain system at a catch basin or manhole. If at any time such flow shows pollution, the drain will be sealed until the situation is corrected.
(b)
No private sewer system (or I.S.D.S.) shall be constructed within twenty-five (25) feet of a property line, fifty (50) feet of a street boundary line, one hundred (100) feet of a subsurface drain, or one hundred fifty (150) feet of a wetland, stream, pond or spring, except with approval of the plan commission. The locationof sewer systems and/or individual sewage disposal systems (I.S.D.S.), within the Scituate Reservoir Watershed, shall comply with dimensional criteria listed in Table 19.1 of the Rhode Island Department of Environmental Management Rules and regulations for I.S.D.S.'s. No private well shall be constructed within fifty (50) feet where possible, but no less than twenty-five (25) feet of a property line or one hundred (100) feet of a septic system.
(c)
All drain lines, except laterals crossing street to basins on other side, will be laid on the upgrade side of the street.
(d)
No drain line will exceed three hundred (300) feet without a catch basin or manhole. A manhole or catch basin is also required where any change of slope or horizontal angle in the pipe line is made.
(e)
All drainage lines shall have a minimum diameter of twelve (12) inches and shall be at a minimum depth of three (3) feet. Minimum pitch of all lines shall be five-tenths (0.5) percent or six (6) inches in one hundred (100) feet of run.
(f)
Where necessary, drains shall be designed to accept ground water as well as surface water.
(g)
Pipes shall be Class III reinforced concrete (State of Rhode Island Specifications) unless poor ground support indicates use of metal pipe of proper gauge, coated and paved.
(h)
Catch basins shall be constructed to State of Rhode Island Specifications as approved by the plan commission.
(i)
All back fill of pipe lines shall be done with suitable type material such as gravel or pea stone with no stone larger than four (4) inches or any organic or frozen material. All pipes must be bedded in back fill and properly tamped below the center line of the pipe before covering. Where ditch bottom is on rock or ledge, at least eight (8) inches of bedding material must be under pipe.
(j)
The plans of all drainage systems must include profiles showing grade of all lines, depth of catch basin and pipe invert dimensions on lines entering or exiting from them. These plans must be accompanied with figures from a hydraulic study of the system justifying sizes of pipe specified. After construction is completed, a corrected set of plans must be furnished, taking into account all changes made as constructed.
5. - Location of utilities and poles.#
(a)
All utility lines and poles shall be located on the downgrade side of the road six (6) feet in from the shoulder.
(b)
No pole shall be within six (6) feet of a catch basin or driveway.
(c)
All conduits, cables, poles and pipe lines shall be in place before final acceptance of road.
6. - Street signs.#
Adequate street signs of a type approved by the plan commission shall be provided and shall be erected in such manner and at such locations as shall be designated by the plan commission.
7. - Stormwater management.#
(a)
Normally storm drain outfalls shall be directed to wet bottom detention basins to control sediments and runoff volumes. These basins are the preferred method and shall be designed in accordance with the following:
(1)
Engineering analysis required for operation during the two-, ten- and 100-year storms.
(2)
Bottoms shall be loamed and seeded with reed canary grass.
(3)
Side slopes shall not exceed 3:1 and shall be loamed and seeded with conservation grass seed mix.
(4)
Rip-rap emergency overflow channels shall be provided.
(5)
Multiple small basins are preferred to single large basins.
(b)
Alternative methods for stormwater control may be utilized only with the prior approval of the plan commission and the town engineer.