Attachments.pdf

USDA FOREST SERVICE

02/04/2024 Deschutes N.F. – Crescent R.S. Sidewalk & Column Repair Page 1 of 8

SUMMARY OF WORK

PART 1 - GENERAL

1.02 QUALITY ASSURANCE

A. Contractor is responsible for protecting all existing infrastructure.

B. All curbs must be ABA compliant.

C. All materials and construction techniques shall meet applicable Local codes or the requirements herein, whichever is stricter.

1.03 USE OF PREMISES

A. Limited Government Occupancy: Government will occupy site during entire construction period. Cooperate with the Government during construction operations to minimize conflicts and facilitate Government usage. Perform the Work so as not to interfere with the Government's day-to-day operations unless permitted in advance. Maintain safe passage for existing building exits and sidewalks.

B. General: Contractor shall have limited use of premises for construction operations, including use of Project site, during construction period. Contractor's use of premises is limited only by the Government's right to perform work or to retain other contractors on government property. Coordinate the project schedule for use of the premises with the CO.

C. Use of Site: Limit use of premises to areas within the Contract limits. Do not disturb portions of Project site beyond areas in which the Work is indicated.

1. Government Occupancy: Allow for Government occupancy of Project site and use by the government contractors.

2. Driveways and Entrances: Keep driveways, loading areas, and entrances serving premises clear and available to the Government, Government's employees, and emergency vehicles always unless approval is granted in writing for temporary closure by CO. Do not use these areas for parking or storage of materials, unless otherwise allowed, in writing, by the CO.

D. Confine operations at site to areas permitted by:

1. Law

2. Ordinances

3. Contract Documents

4. Forest Service Contracting Officer (CO)

E. Confine storage of materials to areas as approved by the CO. Do not unreasonably encumber site with materials or equipment.

1.04 TEMPORARY UTILITY INSTALLATION

A. General: There are Electrical and Water Services on site.

B. Sanitary Facilities: Toilets are available on site C. Disposal: Contractor shall dispose of all waste material properly and off site.

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1.05 CONSTRUCTION CONTRACTOR QUALITY CONTROL RESPONSIBILITIES

A. Construction Contractor to provide quality-control services required by project work.

B. Construction Contractor to prepare a schedule of tests, inspections, and similar services required by the Project.

C. Submit schedule to Forest Service with bid proposal for project. Include approach to work.

D. The Construction Contractor is responsible for quality control and shall establish and maintain an effective quality control system. The system shall cover all construction and construction related operations, both onsite and offsite. The project superintendent will be held responsible for the quality of work on the job and is subject to removal by the CO for non-compliance with quality requirements specified in the contract.

1.06 FINAL CLEANING

A. Complete the following cleaning operations before requesting inspection for Substantial

Completion for Project:

1. Clean Project site, yard, and grounds, in areas disturbed by construction activities, including landscape development areas, of rubbish, waste material, litter, and other foreign substances.

2. Remove tools, equipment, and surplus material from Project site.

3. Leave Project Site clean and ready for use.

PART 2 – PRODUCTS

2.01 IN KIND REPLACEMENT

1. All work shall be replaced to match the existing style, color, and texture. This includes electrical components of option items.

2. Products to assist the repair in durability may be accepted on a case by case basis and shall be submitted to the COR.

2.02 FORM FACING MATERIALS

1. Smooth-Formed Finished Concrete: Form-facing panels that will provide continuous, true, and smooth concrete surfaces. Furnish in largest practicable sizes to minimize number of joints.

2. Plywood, metal, or other approved panel materials.

3. Exterior-grade plywood panels, suitable for concrete forms, complying with DOC PS 1, and as follows:

a. Structural 1, B-B or better; mill oiled and edge sealed.

b. B-B (Concrete Form), Class 1 or better; mill oiled and edge sealed.

2.03 REPAIR MATERIALS

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1. Repair Underlayment: Cement-based, polymer-modified, self-leveling product that can be applied in thicknesses from 1/8 inch (3.2 mm) and that can be feathered at edges to match adjacent floor elevations.

a. Cement Binder: ASTM C 150, portland cement or hydraulic or blended hydraulic cement as defined in ASTM C 219.

b. Primer: Product of underlayment manufacturer recommended for substrate, conditions, and application.

c. Aggregate: Well-graded, washed gravel, 1/8 to 1/4 inch (3.2 to 6 mm) or coarse sand as recommended by underlayment manufacturer.

d. Compressive Strength: Not less than [4100 psi (29 MPa)] at 28 days when tested according to ASTM C 109/C 109M.

2.04 CONCRETE MIXTURES FOR BUILDING ELEMENTS

1. Footings: Proportion normal-weight concrete mixture as follows:

a. Minimum Compressive Strength: 3500 psi (24.1 MPa) at 28 days.

b. Maximum Water-Cementitious Materials Ratio: 0.50.

c. Slump Limit: 3-5 inch (75-125 mm), plus or minus 1 inch (25 mm).

d. Air Content: 4 percent, plus or minus 1 percent at point of delivery for [1-inch (25-mm)] nominal maximum aggregate size.

2.05 CONCRETE MIX

1. Prepare design mixtures for each type and strength of concrete, proportioned on the basis of laboratory trial mixture or field test data, or both, according to ACI 301.

2. Proportion concrete in accordance with ACI318. The strength of concrete (f 'c), air entrainment, slump, and finish meet the requirements below:

Unit Requirement Compressive Strength (f 'c) (28 day) 3,000 psi Air Entrained 4-6% Slump (±1 inch) 5” Finish Broom finish or as specified by COR

2.06 CONCRETE REINFORCEMENT

a. Install reinforcement that is recommended by the heat cable manufacturer

(option item) and as approved by the COR.

b. Reinforcement Steel Bar – ASTM A615 Grade 60

c. Reinforcing Fabric – ASTM A185

PART 3- EXECUTION

3.01 FORMWORK

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1. Design, erect, shore, brace, and maintain formwork, according to ACI 301, to support vertical, lateral, static, and dynamic loads, and construction loads that might be applied, until structure can support such loads.

2. Construct formwork so concrete members and structures are of size, shape, alignment, elevation, and position indicated, within tolerance limits of ACI 117.

3. Limit concrete surface irregularities, designated by ACI 347R as abrupt or gradual, as follows:

a. Class A, 1/8 inch (3.2 mm) for smooth-formed finished surfaces.

4. Construct forms tight enough to prevent loss of concrete mortar.

5. Fabricate forms for easy removal without hammering or prying against concrete surfaces.

Provide crush or wrecking plates where stripping may damage cast concrete surfaces. Provide top forms for inclined surfaces steeper than 1.5 horizontal to 1 vertical.

6. Install keyways, reglets, recesses, and the like, for easy removal.

7. Do not use rust-stained steel form-facing material.

8. Set edge forms, bulkheads, and intermediate screed strips for slabs to achieve required elevations and slopes in finished concrete surfaces. Provide and secure units to support screed strips; use strike-off templates or compacting-type screeds.

9. Provide temporary openings for cleanouts and inspection ports where interior area of formwork is inaccessible. Close openings with panels tightly fitted to forms and securely braced to prevent loss of concrete mortar. Locate temporary openings in forms at inconspicuous locations.

10. Chamfer or round exterior corners and edges of permanently exposed concrete.

11. Form openings, chases, offsets, sinkages, keyways, reglets, blocking, screeds, and bulkheads required in the Work. Determine sizes and locations from trades providing such items.

12. Clean forms and adjacent surfaces to receive concrete. Remove chips, wood, sawdust, dirt, and other debris just before placing concrete.

13. Retighten forms and bracing before placing concrete, as required, to prevent mortar leaks and maintain proper alignment.

14. Coat contact surfaces of forms with form-release agent, according to manufacturer's written instructions, before placing reinforcement.

3.02 EMBEDDED ITEMS

1. Place and secure anchorage devices and other embedded items required for adjoining work that is attached to or supported by cast-in-place concrete. Use setting drawings, templates, diagrams, instructions, and directions furnished with items to be embedded.

a. Install anchor rods, accurately located, to elevations required and complying with tolerances in Section 7.5 of AISC's "Code of Standard Practice for Steel Buildings and Bridges."

3.03 CONCRETE PLACEMENT

1. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed.

2. Do not add water to concrete during delivery, at Project site, or during placement unless approved by the Contracting Officer.

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3. Cold-Weather Placement: Comply with ACI 306.1 and as follows. Protect concrete work from physical damage or reduced strength that could be caused by frost, freezing actions, or low temperatures.

a. When average high and low temperature is expected to fall below 40 deg F (4.4 deg C) for three successive days, maintain delivered concrete mixture temperature within the temperature range required by ACI 301.

b. Do not use frozen materials or materials containing ice or snow. Do not place concrete on frozen subgrade or on subgrade containing frozen materials.

c. Do not use calcium chloride, salt, or other materials containing antifreeze agents or chemical accelerators unless otherwise specified and approved in mixture designs.

4. Hot-Weather Placement: Comply with ACI 301 and as follows:

a. Maintain concrete temperature below 90 deg F (32 deg C) at time of placement. Chilled mixing water or chopped ice may be used to control temperature, provided water equivalent of ice is calculated to total amount of mixing water. Using liquid nitrogen to cool concrete is Contractor's option.

b. Fog-spray forms, steel reinforcement, and subgrade just before placing concrete. Keep subgrade uniformly moist without standing water, soft spots, or dry areas.

3.04 FINISHING FORMED SURFACES

1. As-cast concrete texture imparted by form-facing material, arranged in an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and defects.

Remove fins and other projections that exceed specified limits on formed-surface irregularities.

2. Rubbed Finish: Apply the following to smooth-formed finished as-cast concrete where indicated:

a. Grout-Cleaned Finish: Wet concrete surfaces and apply grout of a consistency of thick paint to coat surfaces and fill small holes. Mix one part portland cement to one and one-half parts fine sand with a 1:1 mixture of bonding admixture and water. Add white portland cement in amounts determined by trial patches so color of dry grout will match adjacent surfaces. Scrub grout into voids and remove excess grout. When grout whitens, rub surface with clean burlap and keep surface damp by fog spray for at least 36 hours.

3. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent unformed surfaces, unless otherwise indicated.

3.05 CURBS

1. Curbs: Control joints shall be installed at maximum 10’ on centers, and expansion joint (1/2" felt) shall be installed at maximum 60' on centers.

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3.06 PROTECTING AND CURING CONCRETE

1. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures. Comply with ACI 306.1 for cold-weather protection and ACI 301 for hot-weather protection during curing.

2. Evaporation Retarder: Apply evaporation retarder to unformed concrete surfaces if hot, dry, or windy conditions cause moisture loss approaching 0.2 lb/sq. ft. x h (1 kg/sq. m x h) before and during finishing operations. Apply according to manufacturer's written instructions after placing, screeding, and bull floating or darbying concrete, but before float finishing.

3. Formed Surfaces: Cure formed concrete surfaces, including underside of beams, supported slabs, and other similar surfaces. If forms remain during curing period, moist cure after loosening forms. If removing forms before end of curing period, continue curing for the remainder of the curing period.

4. Unformed Surfaces: Begin curing immediately after finishing concrete. Cure unformed surfaces, including floors and slabs, concrete floor toppings, and other surfaces.

5. Cure concrete according to ACI 308.1, by one or a combination of the following methods:

a. Moisture Curing: Keep surfaces continuously moist for not less than seven days with the following materials:

1) Water.

2) Continuous water-fog spray.

3) Absorptive cover, water saturated, and kept continuously wet. Cover concrete surfaces and edges with 12-inch (300-mm) lap over adjacent absorptive covers.

b. Moisture-Retaining-Cover Curing: Cover concrete surfaces with moisture-retaining cover for curing concrete, placed in widest practicable width, with sides and ends lapped at least 12 inches (300 mm), and sealed by waterproof tape or adhesive. Cure for not less than seven days. Immediately repair any holes or tears during curing period using cover material and waterproof tape.

1) Moisture cure or use moisture-retaining covers to cure concrete surfaces to receive floor coverings.

2) Moisture cure or use moisture-retaining covers to cure concrete surfaces to receive penetrating liquid floor treatments.

3) Cure concrete surfaces to receive floor coverings with either a moisture-retaining cover or a curing compound that the manufacturer certifies will not interfere with bonding of floor covering used on Project..

6. Curing Compound: Apply uniformly in continuous operation by power spray or roller according to manufacturer's written instructions. Recoat areas subjected to heavy rainfall within three hours after initial application. Maintain continuity of coating and repair damage during curing period.

a. After curing period has elapsed, remove curing compound without damaging concrete surfaces by method recommended by curing compound manufacturer unless manufacturer certifies curing compound will not interfere with bonding of floor covering used on Project.

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3.07 FIELD QUALITY CONTROL

1. Testing and Inspecting: Contractor will engage a qualified independent testing and inspecting agency to perform field tests and inspections and prepare test reports.

2. Concrete Tests: Testing of composite samples of fresh concrete obtained according to ASTM C 172 shall be performed according to the following requirements:

a. Testing Frequency: See Table 3.6 in Section 014100. A composite sample set consists of one slump test, one air entrainment test, and one temperature test.

b. Slump: ASTM C 143/C 143M; one test at point of placement for each composite sample. Perform additional tests when concrete consistency appears to change or water is added.

c. Air Content: ASTM C 231, pressure method, for normal-weight concrete;one test for each composite sample.

d. Concrete Temperature: ASTM C 1064/C 1064M; one test for each composite sample.

e. Compression Test Specimens: ASTM C 31/C 31M. Cast and laboratory cure one set of three standard cylinder specimens for each composite sample.

1) Compressive-Strength Tests: ASTM C 39/C 39M; test one of three laboratory-cured specimens at 7 days and one specimen at 28 days. If either previous tests fail, test third specimen at 28 days.

2) Strength of each batch delivered will be satisfactory if 28-day compressive-strength tests equals or exceeds specified compressive strength.

3. Test results shall be reported in writing to Contracting Officer and Contractor within 48 hours of testing. Reports shall contain project identification name and number, date of concrete placement, name of concrete testing and inspecting agency, location of concrete batch in work, design compressive strength at 28 days, concrete mixture proportions and materials, compressive breaking strength, and type of break for both 7- and 28-day tests.

4. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

5. Correct deficiencies in the work that test reports and inspections indicate does not comply with the Contract Documents.

3.08 CONCRETE SURFACE REPAIRS

1. Defective Concrete: Repair and patch defective areas when approved by Contracting Officer.

Remove and replace concrete that cannot be repaired and patched to Contracting Officer's approval.

2. Patching Mortar: Mix dry-pack patching mortar, consisting of one part portland cement to two and one-half parts fine aggregate passing a No. 16 (1.18-mm) sieve, using only enough water for handling and placing.

3. Repairing Formed Surfaces: Surface defects include color and texture irregularities, cracks, spalls, air bubbles, honeycombs, rock pockets, fins and other projections on the surface, and stains and other discolorations that cannot be removed by cleaning.

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a. Immediately after form removal, cut out honeycombs, rock pockets, and voids more than 1/2 inch (13 mm) in any dimension in solid concrete, but not less than 1 inch (25

mm) in depth. Make edges of cuts perpendicular to concrete surface. Clean, dampen with water, and brush-coat holes and voids with bonding agent. Fill and compact with patching mortar before bonding agent has dried. Fill form-tie voids with patching mortar or cone plugs secured in place with bonding agent.

b. Repair defects on surfaces exposed to view by blending white portland cement and standard portland cement so that, when dry, patching mortar will match surrounding color. Patch a test area at inconspicuous locations to verify mixture and color match before proceeding with patching. Compact mortar in place and strike off slightly higher than surrounding surface.

c. Repair defects on concealed formed surfaces that affect concrete's durability and structural performance as determined by Contracting Officer.

4. Perform structural repairs of concrete, subject to Contracting Officer's approval, using epoxy adhesive and patching mortar.

5. Repair materials and installation not specified above may be used, subject to Contracting Officer's approval.

Crescent District Office / Issued 03-20-2014 26 21 00 - 1 of 2 SNOW MELTING POWER

DISTRIBUTION AND CONTROL

PANEL

SECTION 26 21 00 - SNOW MELTING POWER DISTRIBUTION AND CONTROL PANEL

PART 1 - GENERAL

1.01 SUMMARY

A. This is a bidder design system.

B. Furnish and install a complete pre-wired power distribution and control panel for snow melting and roof and gutter de-icing applications. Use DigiTraceâ SMPG snow melting panel as manufactured by Tyco Thermal Controls. The panels consist of an enclosure, including a panel board with main contactor, ground-fault protected circuit breakers (30 mA trip level), and an integrated snow melting controller.

C. System includes, but is not limited to, all controls, signal initiating, conduit, wiring and all other equipment necessary for a complete and operating system.

PART 2 - PRODUCTS

2.01 DIGITRACE SMPG1 SINGLE PHASE POWER DISTRIBUTION AND CONTROL PANEL

A. Panel cULus listed to UL Standard 508A and CSA Standard C22.2 No. 14.

B. Panel is available with a NEMA 1 enclosure (for indoor installations), or NEMA 3R enclosure

(for outdoor installations) with space heater and thermostat.

C. Panel incorporates a door-in-door design, isolating the branch circuit breakers from the snow melting controller and the main contactor.

D. Panel incorporates a microprocessor based snow melting controller with adjustable hold-on timer and a temperature sensor.

E. Panel incorporates 1-pole or 2-pole ground fault protected circuit breakers. Protected by a

30-mA-trip ground fault circuit breaker.

F. Panels designed for operation on 277 volts single phase.

G. An optional main circuit breaker available to allow for upstream protection outside the snow melting power distribution and control panel.

2.02 SNOW AND ICE SENSORS

A. For roof and gutter de-icing applications, gutter sensor required.

B. For snow melting applications, an aerial sensor or pavement sensor required.

Crescent District Office / Issued 03-20-2014 26 21 00 - 2 of 2 SNOW MELTING POWER

DISTRIBUTION AND CONTROL

PANEL

PART 3 - EXECUTION

3.01 OPERATION

A. The power distribution and control panel initiates heating cable operation when precipitation is present at temperatures below 38 degrees F (3.3 degrees C). The hold-on timer pushbutton initiates a melt cycle through the snow controller for drifted or tracked snow and ice. For embedded snow melting applications, the included temperature sensor shall be used as a slab temperature sensor to regulate slab temperature.

END OF SECTION

Gate, Gate opener, and controller Pictures

Gate Locations

MichaelGage Image

MichaelGage Text Box Gate #1

MichaelGage Text Box Gate #2