ADDENDUM NO. 1 - City of Rio Grande City 25-26 Road Improvements / Paving Project - TDA Contract No.: CDV25-0261

TECHNICAL SPECIFICATIONS
SPECIFICATIONS
SECTION 01568 - EROSION AND SEDIMENT CONTROL
SECTION 01570 - TRAFFIC REGULATION
SECTION 02080 - ADJUSTING MANHOLES CLEANOUTS,
INLET, & WATER VALVE RISERS
SECTION 02160 - TRENCH SAFETY SYSTEM
SECTION 02210 - SITE GRADING
SECTION 02222 - EXCAVATION
SECTION 02223 - BACKFILLING
SECTION 02225A - TRENCHING
SECTION 02510 - ASPHALTIC CONCRETE PAVING
SECTION 02511 - FLEXIBLE BASE
SECTION 03100 - CONCRETE FORMWORK
SECTION 03200 - CONCRETE REINFORCEMENT
SECTION 03300 - CAST IN PLACE CONCRETE
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SECTION 01568 - EROSION AND SEDIMENT CONTROL
PART 1 - GENERAL
WORK INCLUDED
Provide all equipment and materials, and do all work necessary to construct complete
erosion and sediment control program for minimizing erosion and siltation during the
construction phase of the project. The erosion and sediment control provisions specified
herein are the minimum requirements for an erosion control program. The Contractor
shall provide additional erosion and sediment control materials and methods as required
to affect the erosion and siltation control principles specified herein.
SUBMITTALS
Proposed methods, materials to be employed, and schedule for effective erosion and
siltation control as well as preventing erosion damage shall be submitted for approval.
Submittals shall include:
Propose methods for effecting erosion and siltation control, including plans
indicating location of erosion control devices and siltation basins.
List of proposed materials including manufacturer's product data.
Schedule of erosion control program indicating specific dates from implementing
programs in each major area of work.
EROSION CONTROL PRINCIPLES
The following erosion control principles shall apply to the land grading and construction
phases:
Stripping of vegetation, grading, or other soil disturbance shall be done in a
manner, which will minimize soil erosion.
Whenever feasible, natural vegetation shall be retained and protected.
Extents of areas, which are exposed and free of vegetation and the duration of its
exposure, shall be kept within practical limits.
Temporary seeding, mulching, or other suitable stabilization measures shall be
used to protect exposed critical areas during prolonged construction or other land
disturbances.
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Drainage provisions shall accommodate increased runoff resulting from
modifications of soil and surface conditions during and after development or
disturbance. Such provisions shall be in addition to existing requirements.
Sediment shall be retained on-site.
Erosion control devices shall be installed as early as possible in the construction
sequence prior to start of clearing and grubbing operations and excavation work.
Cut and fill slopes and stockpiled materials shall be protected to prevent erosion.
Slopes shall be protected with permanent erosion protection when erosion
exposure period is expected to be greater than or equal to six months, and
temporary erosion protection when erosion exposure period is expected to be less
than six months.
Permanent erosion protection shall be accomplished by seeding with grass and
covering with an erosion protection material, as appropriate for prevailing
conditions.
Temporary erosion protection shall be accomplished by covering with an erosion
protection material, as appropriate for prevailing conditions.
PART 2 - PRODUCTS
HAY BALES
Hay bales for construction of erosion control devices shall be new, firm, wire or nylon-
bound livestock feed-grade.
SILT FENCING
Silt fencing for construction of erosion control devices shall be new and un-used. Silt
fencing shall be as approved by the Engineer.
PART 3 - EXECUTION
HAY BALE CHECK DAM
Hay bale check dam shall be constructed and installed at surface runoff discharge points
from the major work areas before start of clearing and grubbing.
HAY BALE CATCH BASIN FILTER
Catch basin filters shall be placed at all inlets to drainage structures as structures are
installed. Outlet protection work shall be constructed before runoff is allowed to enter
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the drainage system. Construction and location of catch basins filters shall be as those
areas affected by surface runoff from the area of construction. Existing catch basins will
be protected from sediment.
MAINTENANCE AND REMOVAL OF EROSION CONTROL DEVICES
Watercourses and drainage swales adjacent to construction activities shall be monitored
twice each month for evidence of silt intrusion and other adverse environmental impacts,
which shall be corrected immediately upon discovery.
Culverts, drainage ditches and storm sewer pipes shall be kept clean and clear of
obstructions during construction.
EROSION CONTROL DEVICES
Sediment behind the erosion control device shall be checked twice a month and after each
heavy rain. Silt shall be removed if greater than six (6) inches deep.
Conditions of erosion control devices shall be checked twice each month or more
frequently as required. Damaged and/or deteriorated items shall be replaced. Erosion
control devices shall be maintained in place and in effective condition.
Hay bales shall be inspected frequently and maintained or replaced as required to
maintain both their effectiveness and essentially their original condition. Underside of
bales shall be kept in close contact with the earth below at all times, as required to
prevent water from washing beneath bales.
Silt fences shall be maintained plumb and anchored to the ground without any major tears
in material that will allow sediment to be released. Any torn or destroyed silt fence shall
be replaced. Silt fence shall be kept in close contact with the earth below at all times, as
required to prevent water from washing beneath the silt fence.
Sediment deposits shall be disposed of properly, in a location and manner which will not
cause sediment nuisance elsewhere.
REMOVAL OF EROSION CONTROL DEVICES
Erosion control devices shall be maintained until all disturbed earth has been paved or
vegetated, at which time they shall be removed. After removal, areas disturbed by these
devices shall be regraded.
Erosion protection material shall be kept securely anchored until acceptance of completed
entire project.
PAYMENT
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Erosion and sediment control shall be incidental and subsidiary to bid items identified in
proposal form.
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SECTION 01570 - TRAFFIC REGULATION
PART 1 - GENERAL
SECTION INCLUDES:
Construction parking control
Flag persons
Flares and lights
Haul routes
Traffic signs and signals
Removal
PART 2 - PRODUCTS
SIGNS, SIGNALS, AND DEVICES
Post Mounted and Wall Mounted Traffic Control and Informational Signs
Traffic Control Signals: As approved by local jurisdictions.
Traffic Cones and Drums, Flares and Lights: As approved by local jurisdictions.
Flagman Equipment: As required by local jurisdictions.
PART 3 - EXECUTION
CONSTRUCTION PARKING CONTROL
Control vehicular parking to prevent interference with public traffic and parking, access
by emergency vehicles, and Owner's operations.
Monitor parking of construction personnel's vehicles [in existing facilities]. Maintain
vehicular access to and through parking areas.
Prevent parking on or adjacent to access roads or in non-designated areas.
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FLAG PERSONS
Provide trained and equipped flag persons to regulate traffic when construction
operations or traffic encroach on public traffic lanes.
FLARES AND LIGHTS
Use flares and lights during hours of low visibility to delineate traffic lanes and to guide
traffic.
HAUL ROUTES
Consult with authority having jurisdiction, establish public thoroughfares to be used for
haul routes and site access.
TRAFFIC SIGNS AND SIGNALS
At approaches to site and on site, install at crossroads, detours, parking areas, and
elsewhere as needed to direct construction and affected public traffic.
Install and operate traffic control signals to direct and maintain orderly flow of traffic in
areas under Contractor's control, and areas affected by Contractor's operations.
Relocate as Work progresses, to maintain effective traffic control.
REMOVAL
Remove equipment and devices when no longer required.
Repair damage caused by installation.
Remove post settings to a depth of 2 feet.
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SECTION 02080
ADJUSTING MANHOLES CLEANOUTS, INLET, & WATER
VALVE RISERS
PART 1 - GENERAL
1.01 GENERAL DESCRIPTION OF WORK:
A. This work shall consist of furnishings and installation of
materials and for adjusting manholes, cleanouts, inlets or water
valves risers in accordance with details on the plans and as
specified herein as directed by the ENGINEER.
B. Manholes, cleanouts, inlets and water valve risers shall be
adjusted to position and/or elevation as shown on the plans or
as ordered by the ENGINEER and in accordance with these
specifications.
PART 2 - PRODUCTS
2.01 GENERAL:
A. Manhole, cleanout, and inlet covers, water valve risers, and
brick in good condition, removed in the process of adjustment,
may be re-used.
B. Additional materials required shall be provided as required.
2.02 MATERIALS:
A. Concrete
1. Concrete for inlets shall be 3000 psi (28 day compressive
strength) concrete containing a minimum of 5 sacks
cement per cubic yard.
B. Mortar:
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