HomeMy WebLinkAbout680320.tiffWELD COUNTY ROADWAY SPECIFICATIONS
DEFINITIONS
1. Design Grade
2. Excavation
3. Embankment
4. Grading
5. Subgrade
The elevation established for final grade.
The removing of material from its existing position.
A mound constructed of specified materials and in
accordance with specified procedures.
The operation of moving soil or other natural
substances from one position to another to obtain
a required elevation for the construction of roadway
sidewalk or other improvement.
That level of the road structure upon which the
sub -base (if required), the base (if required)
or the surface is to be placed.
5-A. Select Material
"Hard Dirt" To be applied on sand fills only, a six (6) inch
layer between sandfill and sub -base.
6. Sub -base That material in pavement construction which lies
between the subgrade and the base.
7. Base That material in pavement construction which lies
immediately below the surfacing.
8. Granular Material A material which consists of particles larger than
200 mesh.
9. Prime Coat
An application of a low viscosity liquid asphaltic
material to an absorbent surface preparatory to any
superimposed treatment or construction.
10. Surfacing Upper portion of road upon which traffic moves.
11. Tack Coat The application of asphaltic material to an existing
pavement to ensure thorough bond between superimposed
construction and the old pavement surface.
12 Seal Coat A thin asphaltic surface treatment applied to an
existing surface.
13. Finished Grade The final designed level to which finished
surfacing is to be constructed.
14. Stabilometer A device for measuring resistance to plastic
deformations of asphaltic paving materials.
15. Construction Joint Any joint formed to facilitate construction.
16. Contraction Joint
A dummy groove in the transverse direction formed
in the plastic concrete or sawed in hardened
concrete to control random cracking.
680320
BOND REQUIREMENTS
Notes The term bond shall be any surety acceptable to the regulating authority,
such as, surety bond A A A rated company, cash, real estate, etc.
1. Municipalities, counties, or governing agencies shall require a bond
for work in public rights of way where it is the duty and responsibility
of the municipality, county, or regulating agency to maintain said
public rights of way after completion of the work.
2. A noncancellable bond in an amount as specified below, payable to the
municipality, county, or regulating agency, shall be required in the
name of the contractor prior to the commencement of any work. Said
bond shall assure recovery by the regulating agency of any expense
incurred, within a period of 365 days following the acceptance of the
construction. Said recovery to be the amounts necessary to repair
or replace said construction. Said bond shall not be cancelled without
30 days notice to said municipality, County, or regulating authority.
The amount of said bond is $5,280.00 per mile of fifty (50) foot wide
road plus ten percent (10x) or 55,808.00 per mile of sixty (60) foot wide
road.
3. Amount of Bonds
a. Work in Public Rights of Way (New Subdivision)
In new subdivisions, the subdivider of the property shall post
with the regulating agency a bond in an amount of 100 per cent
of the total cost of the improvements of said subdivision.
Said cost of improvements shall be that required to bring the
area within the public rights of way up to the standard of the
regulating authority as determined by the regulating authority.
In new subdivisions where the subdivider is bonded, the contractor
performing the work need not be bonded.
The subdivider may bond for only those rights of way that he
intends to develop immediately. Under this condition, building
permits and construction shall be allowed only on those properties
on which the abutting rights of way are bonded. Work in any other
contiguous area may commence upon posting the required bond for that
area. There will be no partial release on bonds - work must be
completed prior to the release of a bond.
b. Work in Public Rights of Way (Other than new Subdivisions)
CLOSING OF STREETS AND ROADS
Should operating conditions require the Contractor to close a street or road,
the Contractor must accomplish the following requirements'
1. Submit a written notice to the Engineer 48 hours prior to
closing of street.
2. Notify the appropriate fire protection district and sheriff or
police of the exact location of street and date traffic will be
impeded, 24 hours prior to closing of street.
3.- Streets can only be closed between the hours of 8'30 A. M. to
3'30 P. M. or an approved alternate route provided with detour signs.
4. Contractor shall furnish, erect and maintain, at his own expense
necessary barricades, suitable and sufficient flashers, construction
signs, provide a sufficient number of flagmen, and take necessary
precautions for the protection of the work and safety of the public
around his construction operations.
LINES AND GRADES SURVEYS
1. All lines and grades will be furnished by a Registered Professional
Engineer to the Municipality or County for checking and approval. If
necessary, the Contractor's operations may be suspended to permit checking.
The Contractor shall have all lines and grades set by a registered
Engineer or Land Surveyor. All bench marks and control survey points
shall be preserved by the Contractor.
2. Work performed as required in paragraph 1. above, shall be at the
expense of the Contractor.
GRADING AND SUBGRADE PREPARATION
2.1- Scope
The work covered by this section of the specifications consists in
furnishing all labor, equipment, supplies and materials in connection with
the excavations, construction of embankments, including borrow and grading
pertaining thereto for roads, and the preparation of subgrade, as required,
complete, in strict accordance with this section of the specifications and
the applicable drawings.
To be accomplished by a private contractor for a private
individual where said work in the engineer's opinion is minor,
the contractor shall post a bond of $2,500.00 (minimum) to assure
compliance with the regulating specifications. In the case of major
construction projects, the bond shall be in the amount of $1.00
per linear foot of length where road is fifty (50) feet wide.
For increased widths, an added amount of one(1) cent per one (1)
foot width above the $1.00 per linear foot. Thus sixty (60) foot
roadway requires 5280 times $1.10 equaling $5,808.00 per mile of
length.
AUTHORITY OF THE ENGINEER
A. The Engineer or his authorized representative shall give all orders
and directions contemplated under tha Contract Documents, Specifications
or Resolutions relative to the execution of the work. The Engineer shall
determine the amount, quality, acceptability and fitness of the several
kinds of work and materials which are to be paid for or installed under
the contract or permit and shall decide all questions which may arise
in relation to said work and the construction thereof. The Engineer's
estimates and or decisions shall be final and conclusive except as
herein otherwise expressly provided. In case any question shall arise
between the parties hereto, relative to the Contract Documents,
Specifications or Resolutions, the determination or decision of the Engineer
shall be a condition precedent to the right of the Contractor or receive
final approval of the work under his contract.
B. Prior to commencement of the work the Contractor shall prepare and submit
to the Engineer for approval, a written schedule covering the general
sequence of the whole work to be performed. The work schedule, when
approved, shall not be subject to change by the Contractor without the
written consent of the Engineer. Orderly procedure of all work to be
performed under this contract shall be the full responsibility of the
Contractor.
2.2 - Excavation
Excavation of every description and of whatever substances encountered
within the limits of the project shall be performed to the lines and grades
indicated on the drawings. Except as otherwise permitted by the engineer,
all excavated areas shall be excavated in such a manner as will afford
adequate drainage. All suitable material removed from the excavations
shall be used, insofar as practicable, in the formation of embankments,
backfilling, and for such other purposes as directed by the engineer.
Where material encountered within the limits of the work is considered
unsuitable by the engineer, such material shall be excavated below the grade
shown on the drawings or as directed by the engineer, and replaced with
suitable material. All excavated materials which are considered unsuitable
and any surplus of excavated material which is not required for embank-
ments shall be disposed of by the contractor.
2.3 - Embankment
This work shall consist of the construction of embankments by depositing
placing and compacting materials of acceptable quality above the natural
ground or other surface in accordance with the lines, grades and cross -
sections shown on the plans and as required by the engineer.
Before any embankment is placed, clearing, tree removal, sod and topsoil
removal over the entire area shall be performed as directed by the engineer.
Clearing shall consist of the removal and disposal of obstructions such as
foundations, walls, fences, buildings, rubbish, etc., to a depth of at least
12 inches below subgrade elevation.
Sod within the area shall be removed to a depth of 6 inches.
Trees, except those designated to be saved, and all stumps shall be
removed to at least 18 inches below the subgrade elevation. Trees
designated to be saved shall be protected carefully during clearing and
subsequent construction operations.
Each layer of the embankment material shall not exceed 8 inches in loose
depth and shall be disced sufficiently to break down oversized clods. The
contractor shall thoroughly mix the different materials to secure a uniform
moisture content and insure uniform density and proper compaction. Each
layer shall be thoroughly compacted by roller or vibratory equipment for
the type of embankment material.
2.4 - Borrow or Excess Excavation
In the event sufficient suitable filling material is not obtained within
the limits of this contract to provide all the embankment required, the
contractor shall furnish such additional filling material (borrow) to
complete the designated embankment.
Borrow shall be an acceptable type of soil as the embankment material and
shall be approved by the engineer before being placed.
2.5 - Subgrade
The bottom of the excavation for the top of the fill shall be known as the
surfacing subgrade and shall conform to the lines, grades and cross sections
shown on the plane. Soft and yielding material and other portions of the
subgrade which will not compact readily when rolled or tapped shall be
removed as directed and replaced with suitable granular material, placed and
compacted as specified herein.
Trenches and structure excavations shall be backfilled to natural or
finished grade as soon as conditions permit. Backfill shall be compacted
with mechanical tampers in layers of not over 6 inch loose material.
Vibratory compactors that are small enough to operate within the limited
area may be used. The subgrade shall be finished in an acceptable
condition for at least one day's progress in advance of the gravel surfacing
construction at all times. No paving, sub -base or base material shall be
placed upon a soft, spongy or frozen subgrade or other subgrade, the
stability of which is, in the opinion of the engineer, unsuitable for the
placement thereof.
2.55 - Hard Dirt or Select Borrow Material
Fills and embankments which are composed of dune sand (blow sand) shall
be topped out with six (6) inch thick layer of moist, compacted "Hard dirt".
Hard dirt shall include black soil (w/o humus or vegetable matter), certain
kinds of clay or loam, but not muck nor swampy top soil from lagoons etc.
2.6 - Protection of Fidshed Grade
The finished grade shall be maintained in a smooth and compacted condition
until the gravel surfacing has been placed. During the construction of
surfacing course, if trucks cause rutting or displacement of the subgrade
material, the contractor shall re -roll or hand -tamp the subgrade to correct
any ruts or other objectionable irregularities which may have been caused
by the trucking of materials.
2.7 - Protection of Utility Lines
The contractor shall at all times take proper precautions for the protection
of Unity lines, the presence of which are known or can be determined by
the examination of appropriate maps of the utility companies. The contractor
shall be responsible for the repair of any damaged service lines.
2.8 - Protection of Miscellaneous Public and Private Installations
The contractor shall at all times take proper precautions for the protection
of and replacement or restoration of driveway culverts, street intersection
cuberts or aprons, irrigation crossings, mail boxes, driveway approaches,
and all other public and private installations that may be encountered
during construction.
3.0 - Sub -Base Material
3.1 - Description
This item shall consist of a foundation course composed of coarse
granular material, constructed on the prepared bade in accordance with
these specifications and established by the engineer. Standard thickness
of sub -base shall be six (6) inches.
3.2 - Gradation
This material need not be crushed but can be of the pit run variety
providing it is graded within the following limits,
Standard Size of Sieve
2- inch
2 inch
No. 4
No. 200
Liquid Limit
Plasticity Index
Percentage by weight passing Sieve
100%
95 - 100%
30 - 60%
5 15%
35 max
6 max
Bearing value and/or stabilometer tests may be required to properly
evaluate the quality of the material.
The material supplied shall be a well graded mixture, consisting of sound
aggregate particles and sufficient filler or other proper quality binding
material, which when placed and compacted will result in a firm, dense,
unyielding foundation.
Select Borrow Material
In the event that suitable material is not available in the district for
backfilling excavations from which unsuitable material has been removed,
the contractor shall procure select subgrade material conforming to the
following requirements.
3.3 - Placement
Select sub -base material shall be placed to the minimum depth as determined
by the engineer from Figure 6. The thickness of any one layer shall in no
case exceed six (6) inches. Wetting or aerating and rolling of the material
will be required as ordered by the engineer. The surface of the select
sub -base material after compacting shall coincide with the finished grade
elevation.
4.0 - Base Course Material
4.1 - Description
This item shall consist of a foundation course composed of crushed gravel
or crushed stone and filler, constructed on the prepared base in accordance
with these specifications and established by the engineer.
4.2 - Materials
Crushed gravel or crushed stone base course material shall consist of
hard, durable particles or fragments of stone or gravel crushed to
required size and a filler of sand or other finely divided mineral matter.
The portion of the material retained on a No. 4 sieve shall be known as
coarse aggregate, and that portion passing a No. 4 sieve shall be known as
filler. When produced from gravel, not less than 50% by weight of the
Coarse aggregate particles shall be particles having at least one fractured
face, and if necessary to meet this requirement or to eliminate an excess
of filler, the gravel shall be screened. The composite base course material
shall be free from vegetable matter and lumps or balls of clay and shall meet
one of the following grade requirements:
Standard Size of Sieve
1 inch
1 inch
3/4 inch
3/8 inch
No. 4
No. 10
No. 40
Percentage by weight passing Sieve
Type I Type II
100%
90 - 100%
60-
90%
45 - 75%
30 - 60%
20 - 50%
10 - 30%
100%
30-60%
25-50%
No. 200 5 - 15% 5 - 12%
Liquid Limit 25 Max* 25 Max*
Plasticity Index 6 Max 6 Max
*30 max. if non -plastic
Bearing value and/or stabilometer tests may be required to properly
evaluate the quality of the material.
4.3 - Abrasion
Course aggregate shall show a loss of not more than fifty per cent (50%)
when tested in accordance with A, A. S. H. 0. Standard Method of Test for
Abrasion of Coarse Aggregate by use of the Los Angeles Machine, Designation:
T-96 (A. S. T. M. C131)
4.4 - Placing and Spreading
Base course material shall be placed to a depth as determined by the engineer
from Figure 6 on the prepared subgrade as described in Paragraph 2.5 and
compacted in layers to required thickness. The material shall be deposited
and spread in a uniform layer and without segregation of size to such loose
depth that when compacted the layer shall have a thickness not to exceed
4 inches. The material shall be compacted to a minimum density of 100% as
determined by Laboratory Test Method A. A. S. H. 0. T-99.
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