Furnish all labor, materials, equipment and incidentals necessary for trenching of utilities and appurtenances, including backfill, test pits, and disposal of surplus materials.
A. 
It shall be the contractor's sole responsibility to contact Dig Safe prior to construction.
B. 
Existing utilities.
(1) 
Prior to construction, the Town shall mark out locations of existing water, sewer and drainage utilities based on best available information. This shall not in any way relieve the contractor from damages to the existing utilities.
(2) 
The contractor shall be responsible for maintaining and recording all utility locations during construction. The contractor shall pay all expenses for any relocating of existing utilities performed by the Town.
A. 
Responsibilities of contractor.
(1) 
The contractor shall make excavations in such manner and to such widths as will give suitable room for laying, jointing, and bedding the pipe and furnish and place sheeting as necessary and for dewatering and maintaining the trench in a dry condition.
(2) 
It is the contractor's responsibility to satisfy all federal, state and local regulations such as those of OSHA.
B. 
Elevation; width.
(1) 
In general, trenches shall be excavated to an elevation of one foot below the elevations specified on the drawings. Excavations for structures such as manholes shall be one foot below the base or as specified on the plans.
(2) 
The allowable trench width shall be 2.0 feet greater than the normal pipe size or a minimum of three feet, whichever is greater. Excavations around structures shall extend enough to adequately compact using mechanical tampers.
C. 
Excavation outside lines or below grade.
(1) 
All pavement is to be cut prior to excavation. The contractor shall at all times exercise care not to excavate outside the trench limiting lines as shown on the drawings. No extra allowance will be given for backfilling, rock removal, paving, or other work resulting from excavation beyond these lines.
(2) 
If the contractor excavates below grade through error for his own convenience, or through failure to properly de-water the trench, or disturbs the subgrade before de-watering is sufficiently complete, he may be directed by the Engineer to excavate below grade, in which case the work of excavating below grade and furnishing and placing the refill shall be performed at his own expense.
D. 
Unsuitable or surplus material.
(1) 
If in the opinion of the Engineer the material at or below the normal grade of the bottom of the trench is unsuitable for foundation, it shall be removed to the depth directed by the Engineer and replaced by an approved second gravel.
(2) 
Surplus material excavated from trench and abandoned pipe and utilities, broken pavement, masonry, reinforced concrete, and other materials encountered in the excavation and not suitable for landfill become the property of the contractor and must be disposed of appropriately.
E. 
The contractor shall furnish all labor, materials, equipment, and incidentals required to repair any existing utilities damaged during construction. Any assistance rendered to the contractor by the Town in isolating or repairing damaged utilities shall be appropriately deducted from the contract bid price.
A. 
Rock excavation.
(1) 
Rock excavation shall consist of all solid rock which cannot be removed without blasting or ripping. It shall consist of boulders and parts of masonry structures when found to measure one cubic yard or more.
(2) 
Material which can be loosened and removed, such as loose or fractured rock, frozen materials, shale, hardpan, and the like, and material which is outside of the limits of measurements allowed shall not be measured or classified as rock excavation.
(3) 
Where rock is encountered, it shall be uncovered but not excavated until measurements have been made by the Engineer. All ledge within the trench limitations will be removed and disposed of off the site by the contractor. All ledge excavated from the trench will be replaced with suitable material approved by the Engineer.
B. 
Blasting operations.
(1) 
All blasting operations shall be conducted in full compliance with all the laws of the state, with all local ordinances, and with all possible care so as to avoid injury to person and property.
(2) 
The contractor shall perform a pre-blast survey of the area where blasting is required. He shall record existing conditions in written form, sketches, photographs, videotapes, or any other form. All nearby buildings, foundations, driveways, roadways, and other existing structures shall be inspected for cracks, loose masonry, and other conditions which might be attributable to blasting at a later date. A copy of said survey shall be provided to the Engineer before blasting commences.
(3) 
The contractor shall record the location, depth, and size of each hole. A copy of said blasting record shall be provided to the Engineer at the conclusion of blasting rock.
(4) 
No blasting will be permitted under or adjacent to any street, road, or highway unless permission has been received in writing from the authority having jurisdiction.
(5) 
Conform to all municipal, state, federal, and other ordinances and codes relating to the storage and hauling of explosives. Particular attention is called to adherence to requirements of the electric, gas, and other utilities which may be located in the project area.
(6) 
Damages and costs of whatever nature resulting from the work specified herein shall be borne solely by the contractor.
A. 
From the bottom of the trench to a minimum of 12 inches above the pipe crown shall be referred to as the "pipe embedment." Select material shall be three-fourths-inch crush stone or as indicated on the drawings. The selected material shall be hand-tamped around the pipe so that each section shall have a firm bearing throughout its entire length.
B. 
Selected materials shall conform to the following standards:
(1) 
Sand shall be free from stone or any organic matter.
Sieve Size
Percent Passing By Weight
3 inches
100
No. 4
70 to 100
No. 200
0 to 12
(2) 
Bank-run gravel shall be graded such that the maximum size of stone particles shall not exceed 3/4 of the completed depth of the layer being placed. In no case shall the stone size be larger than six inches.
Sieve Size
Percent Passing By Weight
6 inches
100
No. 4
25 to 70
No. 200
0 to 12
(3) 
Crushed gravel. At least 50% of the material retained on the one-inch sieve shall have a fractured face.
Sieve Size
Percent Passing By Weight
3 inches
100
2 inches
95 to 100
1 inch
55 to 85
No. 4
27 to 25
No. 200
0 to 12
(4) 
Crushed stone. Crushed stone shall consist of clean durable ledge and rock. It shall be free from thin, elongated pieces.
Sieve Size
Percent Passing By Weight
1 inch
100
3/4 inch
85 to 100
1/2 inch
15 to 45
No. 4
0 to 5
No. 3
0 to 5
No. 50
0 to 5
No. 200
0 to 5
A. 
The material above the pipe embedment zone shall be selected backfill or common fill as specified on the plans. All trenches within the limits of a roadway, shoulder, sidewalk, or other paved areas shall be thoroughly compacted by hand or mechanical means in layers not to exceed 12 inches. Each backfill layer shall be at 95% of its optimum density.
B. 
All backfill material shall be free from all organic matter and debris. No stone or rock fragments larger than six inches shall be deposited in the backfill.
C. 
Any trench areas improperly backfilled or having excessive settlement shall be reopened to the depth required, then refilled, compacted, restored to the required grade, mounded over and smoothed or repaved as necessary.