A. 
All improvements specified or implied on the definitive plan shall be constructed in accordance with the approved plans. Details omitted from the plans shall be submitted to the Board for approval. Methods and materials of construction shall be as contained herein. Items not specifically mentioned herein shall be constructed as directed or approved by the Board.
B. 
All references to soil compaction shall mean soil compaction as determined by ASTM D-1557-66T.
C. 
The owner shall at all times have on site a copy of the approved plans, conditions of approval and these regulations.
Prior to and during construction all lines and grades necessary for the construction and construction inspection of the subdivision shall be field staked.
The entire area of each street within its exterior lines and its adjoining sloped areas shall be cleared of all stumps, brush, roots, rocks, boulders and like material and also of all trees not intended for preservation. Rock and boulders shall be taken away or broken off to a depth of not less than 12 inches below the bottom of the roadway foundation.
A. 
Within each street the roadway, including any required shoulders and sidewalks, shall be excavated for the full length and width to a depth of at least 15 inches below the finished surface or filled to a subgrade, the top of which is 15 inches below the finished surface. If the soil is soft or yielding, or contains rocks, boulders, clay, peat or other materials detrimental, in the opinion of the Board, to the subgrade, such material shall be removed to such additional depth as required by the Superintendent of Streets or the Board and replaced with approved material compacted to 95% maximum density.
B. 
All fills shall be placed in lifts not to exceed one foot in depth (loose measure), shall be of an approved material containing not more than 10% material by weight passing the 200 sieve and each layer shall be compacted to 95% maximum density based upon ASTM D1557-66T.
A. 
Piping.
(1) 
Drainage piping shall be reinforced concrete pipe conforming to ASTM C76 Type III.
(2) 
There shall be a minimum of 2 1/2 feet cover on the pipe.
(3) 
Joints on all drainpipes shall be sealed by packing with a gasket of jute or oakum. The top 3/4 of the joint shall be filled with cement mortar unless open joints are specifically approved by the Board.
(4) 
All pipe shall be laid true to line and grade.
(5) 
Pipe trench shall conform to Figure 3 attached. Ledge and boulders or other unsuitable material shall be removed to a distance of six inches from the bottom of the pipe.
(6) 
Reinforced concrete headwalls shall be constructed and installed in conformance with MassDOT Standard Details Drawing E 206.4.0 attached as Figure 4.
(7) 
Flared ends shall be constructed in conformance with MassDOT Standard Details Drawing E 206.8.0 attached as Figure 5. Any pipes requiring grates at their termination shall have headwalls.
(8) 
All open-ended pipes over 15 inches in diameter shall be provided with a vertical grate of wrought iron or galvanized steel permanently attached to the end of the pipe. Horizontal distance between the vertical bars of the grate shall be approximately nine inches. No bars shall be placed within six inches of the pipe invert.
(9) 
Where drain piping is or will be near on-site sewage disposal systems type of pipe may be varied at the Board's discretion.
(10) 
Scour protection shall be provided for a distance not less than six nominal pipe diameters from the pipe end. Scour protection shall be composed of a layer of stones 12 inches in thickness or more placed upon a gravel bed six inches in thickness. The stones shall be sized so that not less than 60% shall have one dimension 12 inches or more. The stones after being laid shall be carefully chinked by hand to make a reasonably smooth and shaped surface.
B. 
Catch basins and manholes.
(1) 
All catch basins and manholes shall be constructed of precast cement concrete, brick or of cement concrete blocks. All catch basins or manholes made of masonry shall be laid in mortar and plastered on the outside. All catch basins and manholes shall have an inside diameter of at least four feet and shall be constructed in accordance with the latest revisions of MassDOT Standard Details and MHD Specifications. Field chipping or cutting of precast concrete manholes shall be witnessed and approved by the Board.
(2) 
Catch basins shall be provided with a minimum sump of 2 1/2 feet. All catch basins shall be provided with granite throatstones. Where bituminous concrete berms are used, granite transition pieces shall be provided at either side of the throatstone. Catch basin hoods shall conform to MassDOT Standard Details Drawing E 201.12.0 (LeBaron L202 or equal).
(3) 
Catch basins and manholes shall be provided with cast-iron frames and grates equal to LeBaron LF248-2 or LeBaron LK110 as applicable. Manhole covers shall have the word "DRAIN" imprinted thereon in letters three inches high.
(4) 
Manholes shall be provided with paved inverts to 1/2 the height of the exiting pipe.
Municipal services including sewer system, electricity, communication, gas and cable television shall be installed in accordance with the specifications of the utility company or agency having jurisdiction. Copies of all specifications for construction shall be obtained by the owner and kept on site available for inspection by the Board or its agents.
A roadway foundation consisting of a minimum of 12 inches of gravel borrow conforming to MHD Specification M1.03.0 Type b (three-inch maximum size stone) or MHD Specification M1.11.0 shall be deposited for the full width of the paved roadway including berms. MHD Specification M1.11.0 material shall not be used under porous pavement. It shall be compacted to 95% maximum density. All underground utilities shall be installed and backfilled prior to placing of the roadway foundation.
A. 
Roadway surfaces in residential areas. After the roadway foundation has been constructed, it shall receive the following surface treatment:
(1) 
The roadway shall be paved to a thickness of three inches measured after compaction with two courses 1 1/2 inches thick of Class 1 bituminous concrete pavement, Type I-1.
(2) 
The aggregate shall be composed, mixed and laid hot in two courses as specified in MHD Specifications Section 460 for Class 1 bituminous concrete pavement as set forth in Section 460.20 to 460.82 or as amended.
B. 
Roadway surfaces in industrial areas shall be constructed as described in Subsection A above except that the minimum thickness of pavement shall be four inches, a binder course of 2 1/2 inches and a surface course of 1 1/2 inches.
C. 
No pavement shall be laid on wet or otherwise unsuitable roadway foundations.
A. 
Sidewalks shall be constructed on a foundation of twelve-inch gravel borrow. Sidewalk foundation shall be constructed to conform to the requirements of § 325-34, Roadway foundation, above.
B. 
After sidewalk foundation has been constructed, the sidewalk shall be paved to a thickness of three inches measured after compaction with two courses 1 1/2 inches thick of Class 1 bituminous concrete pavement, Type I-1, or other materials deemed suitable by the Planning Board. The material and application shall conform to the specifications for roadway surface. All edges of the sidewalks shall be formed with wood screeds, or otherwise constructed to produce straight, clean sidewalk edges.
A. 
Granite curbing shall be MHD Specifications Type VA-4. Curbing shall be set on a six-inch gravel borrow base compacted to 95% maximum density. Curbing shall be set and held in place with a six-inch depth lift of portland cement concrete on both sides of the curb.
B. 
Bituminous concrete berms shall be constructed to the dimensions shown on the definitive plan and in accordance with the typical sections. Berms and surface paving course shall be monolithic.
A. 
The top six inches of grass strips and side slopes shall consist of good quality loam, screened, raked and rolled with a suitable roller to grade. Required depth of loam shall be measured after rolling. Fertilizer shall be applied and mixed with the upper two inches of loam at the rate of 30 pounds per 1,000 square feet. Fertilizer shall be a complete commercial fertilizer 10-10-10 grade suitable for the topsoil it will be applied to.
B. 
Seed shall be as approved by the Board and shall be delivered in sealed containers bearing the dealer's guaranteed analysis. Seed shall not have more than 1% by weight weed content.
A. 
The area in back of the sidewalk, where slope is required, shall be graded to a slope of three feet horizontal to one foot vertical.
B. 
Field stone masonry retaining walls may be used in certain circumstances when approved by the Board.
A. 
Monuments shall be placed along both sides of the roadway layout at all points of curvature and tangency, at all angle points in the roadway layout and in all other locations shown on the approved plans. Granite or concrete monuments not less than four feet in length dressed to four inches by four inches in section at the top and bottom shall be provided and shall be set flush to finish grade. The exact location point shall be indicated by a hole having a diameter of 1/4 inch and a depth of 1/2 inch.
B. 
No permanent monuments shall be set until all construction which could destroy or disturb the monument is completed.
C. 
The as-built plan required shall contain a certification by a Massachusetts registered professional land surveyor that the bounds have been set as shown on the definitive plan.
The developer shall furnish, set in concrete, and erect street signs prior to the occupancy of any house on the street. Street signs shall conform to Cohasset Department of Public Works requirements and shall be approved by the Board. Signs shall contain the name of all intersecting streets. Street sign location shall be as shown on the plans or as approved by the Board.
Improvements not covered herein shall be detailed on the submitted subdivision plans and shall be subject to the approval of the Board.