Atch_1-2__Specs.pdf

USDA FOREST SERVICE PROJECT SPECIFICATIONS

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 1/1 Specification List

SPECIFICATION LIST

GREEN RIDGE LOOKOUT WALKWAY REPLACEMENT

Sisters Ranger District

Deschutes National Forest Jefferson County, Oregon

CONSTRUCTION SPECIFICATION INSTITUTE (CSI) SPECIFICATIONS

SECTION TITLE

DIVISION 01 – GENERAL REQUIREMENTS

01020 Intent of Contract 01025 Measurement and Payment 01200 Mobilization

DIVISION 32 – EXTERIOR IMPROVEMENTS

32323 Geocell Foundation 32340 Timber Walkway

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 01020 - 1/1 Intent of Contract

SECTION 01020

INTENT OF CONTRACT

1. PART 1 - GENERAL

1.01 SUMMARY

A. The intent of the contract is to provide for the complete construction of a fully functional project as described in the contract documents and Drawings. Unless otherwise provided, the Contractor shall furnish all labor, materials, equipment, tools, transportation, and supplies, and shall perform all work required to complete the project within reasonably close conformity to the Drawings and Specifications, and in accordance with provisions of the contract.

2. PART 2 – PRODUCTS (NOT USED)

3. PART 3 – EXECUTION (NOT USED)

4. PART 4 - MEASUREMENT AND PAYMENT (NOT USED)

END OF SECTION

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 01025 - 1/2 Measurement and Payment

SECTION 01025

MEASUREMENT AND PAYMENT

1. PART 1 - GENERAL

1.01 SUMMARY

A. Measurement and payment for contract work will be made only for and under those pay items included in the Schedule of Items. All other work, labor, materials, equipment, and incidentals necessary to successfully complete the project will be considered as included in the payment for items shown. This section defines the method of measurements and basis of payment for work items listed in the Schedule of Items.

B. When more than one class, size, type, thickness, etc. is specified in the Schedule of Items for any pay item, suffixes will be added to the item number to differentiate between the pay items.

C. Not all units and measurement methods may be used under this Contract.

1.02 DETERMINATION OF QUANTITIES

A. The following measurements and calculations shall be used to determine contract quantities for payment.

1. For individual construction items, longitudinal and lateral measurements for area computation shall be made horizontally or corrected to horizontal measurement unless otherwise specified. Measurements for geotextiles, netting, and erosion control blankets shall be along slope lines.

2. For structures they shall be measured according to neat lines shown on the Drawings or as altered by the CO, in writing, to fit field conditions.

3. For items that are measured by the linear foot, such as pipe culverts, fencing, guardrail, piping, utilities, and underdrains, measurement shall be made parallel to the base of foundation upon which the structures are placed.

4. For standard manufactured items (such as fence, wire, plates, rolled shapes, pipe conduits) identified by gauge, weight, section dimensions, and so forth, such identifications shall be considered the nominal weights or dimensions.

Unless controlled by tolerances in cited specifications, manufacturer's tolerances shall be accepted.

1.03 UNITS OF MEASUREMENT

A. Payment shall be by units defined and determined according to U.S. Standard measure and by the following:

1. Lump Sum (LS): One complete unit, not directly measured. The bid amount is complete payment for all work described in the contract and necessary to complete the work for that item.

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 01025 - 2/2 Measurement and Payment

B. One of the following methods of measurement for determining final payment is designated on the Schedule of Items for each pay item:

1. ACTUAL QUANTITIES (AQ) - These quantities are determined from actual measurements of completed work.

2. DESIGNED QUANTITIES (DQ) - These quantities denote the final number or units to be paid for under the terms of the contract. They are based upon the original design data available prior to advertising the project. Original design data include the preliminary survey information, design assumptions, calculations, drawings, and the presentation in the contract. Changes in the number of units shown in the Schedule of Items may be authorized under any of the following conditions:

a. As a result of changes in the work authorized by the CO.

b. As a result of the CO determining that errors exist in the original design that causes a pay item quantity to change by 15 percent or more.

c. As a result of the Contractor submitting to the CO a written request showing evidence of errors in the original design that cause a pay item quantity to change by 15 percent or more. The evidence must be verifiable and consist of calculations, drawings, or other data that show how the designed quantity is believed to be in error.

3. LUMP SUM QUANTITIES (LSQ) - These quantities denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job. They shall not be measured.

2. PART 2 – PRODUCTS (NOT USED)

3. PART 3 – EXECUTION (NOT USED)

4. PART 4 - MEASUREMENT AND PAYMENT (NOT USED)

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 01200 - 1/1 Mobilization

SECTION 01200

MOBILIZATION

1. PART 1 - GENERAL

1.01 SUMMARY

A. This work shall consist of preparatory work and operations necessary for the movement of personnel, equipment, supplies, and incidentals to the project site, and for all other work and operations that must be performed or that cause costs to be incurred prior to beginning work on the various items on the project site.

2. PART 2 - PRODUCTS (NOT USED)

3. PART 3 - EXECUTION (NOT USED)

4. PART 4 - MEASUREMENT AND PAYMENT

4.01 PROGRESS PAYMENTS WILL BE MADE AS FOLLOWS:

A. When 5 percent or more of the original contract amount is earned from other pay items, 50 percent of the amount for mobilization, or 5 percent of the original contract amount, whichever is less, will be paid.

B. When 10 percent or more of the original contract amount is earned from other pay items, 100 percent of the amount for mobilization, or 10 percent of the original contract amount, whichever is less, will be paid.

C. Upon completion of all work on the project, any unpaid amount for mobilization will be paid.

D. The total of all payments shall not exceed the original contract amount for this item.

4.02 BASIS OF PAYMENT

A. Payment will be made under:

PAY ITEM DESCRIPTION PAY UNIT

01200-1 Mobilization Lump Sum

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32323 - 1/3 Geocell Foundation

SECTION 32323

GEOCELL FOUNDATION

1. PART 1 - GENERAL

1.1 SUMMARY

A. This section specifies work related to furnishing and constructing a Geocell reinforced foundation to bear a wooden walkway and supports; complete with treatment to resist ultraviolet degradation and other related accessories.

1.2 SUBMITTALS

A. Manufacturer's certification, catalog cuts, warranty information, and installation recommendations.

1.3 QUALITY ASSURANCE

A. Furnish geocell panels consisting of sheet strips fabricated from high-density polyethylene (H.D.P.E.) which are connected in series at off-set, full-depth ultrasonic seams, aligned perpendicular to the longitudinal axis of the strips. When expanded, the interconnected strips form the walls of a flexible, three-dimensional cellular confinement structure into which the specified infill materials can be placed.

B. Ensure that the polyethylene material used to fabricate the geocell sections is treated to resist ultraviolet degradation and that it conforms to the following:

1. Density ………………………… 0.935-0.965 g/cm3 per ASTM D1505

2. Environmental Stress

Crack Resistance (ESCR) ……… 2000 hour per ASTM D1693 C. Use strips with a sheet thickness, of 1.27 mm -5% +10% (50 mil -5% +10%) tested per ASTM D5199. Thickness shall be determined in the flat, before any surface texturing or other surface disruption.

2. PART 2 - PRODUCTS

2.1 MATERIALS

A. Geocell

1. GEOWEB manufactured by Presto Products Company; TERRACELL manufactured by Webtec; or approved equal.

B. Geotextile type IV-A C. Course Granular Backfill

1. Well-graded sand and/or gravel, ¾” in the greatest dimension, with less than 10% non-plastic fines passing the 200 sieve. Granular Fill materials shall be approved for use by the CO prior to being transported to the site.

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32323 - 2/3 Geocell Foundation

3. PART 3 – EXECUTION

3.1 DELIVERY AND STORAGE

A. During shipment and storage, wrap the geocell in heavy-duty protective covering.

Protect the geocell from mud, soil, dust, debris and sunlight prior to installation.

3.2 CONSTRUCTION

A. Place the geotextile AS SHOWN ON THE DRAWINGS. Ensure that the surface upon which the geotextile is to be placed is uniform and is reasonably smooth and free of obstructions, depressions, and debris that could damage the geotextile. Have the surface approved by the CO prior to placing geotextile.

B. Place the geocell sections directly on the prepared subgrade. Expand the geocell sections into position at the grades and lines AS SHOWN ON THE DRAWINGS.

Hold the expanded geocell sections with suitable “stretcher frames”, steel stakes driven inside selected outer cell walls, or other similar methods as allowed by the geocell manufacturer prior to filling. Ensure that the individual cells have been expanded to the minimum dimensions required by the manufacturer. If necessary field cut sections as per the manufacturer’s recommendations for the required length.

C. Lay the geotextile without tension, stress, wrinkles or creases.

D. Use one solid, unbroken piece of Geocell. Connected portions are not acceptable.

3.3 BACKFILL

A. Furnish the CO with the manufacturer’s specific recommendations for backfilling prior to placement of the geocells.

B. Use the geocell manufacturer’s specific recommendations for backfilling if they are more stringent than stated below.

1. Place coarse granular backfill into the expanded cells with equipment appropriate for the site conditions. Do not drop infill material more than 3 feet to avoid damage or displacement of the cell walls.

2. Overfill the geocell cells and level to a minimum of 2 inches above the top of the cell walls. Compact the infill material with a vibratory plate compacter.

Operate compaction equipment over the full width of the geocell until visible deformation of the infill ceases. Make at least three complete passes. Grade the surface to be ½ inch above the top of the cells. Ensure that tops of cell walls are not exposed after fine grading is completed.

4. PART 4 - MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASURMENT:

A. Geocell Foundation

1. Measurement will be made of completed Geocell work as shown in the

Drawings and Specifications.

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32323 - 3/3 Geocell Foundation

4.2 BASIS OF PAYMENT

A. Payment will be made under:

PAY ITEM DESCRIPTION PAY UNIT

32323-1 Geocell Foundation Lump Sum

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32340 - 1/5 Timber Walkway

SECTION 32340

TIMBER WALKWAY

1. PART 1 - GENERAL

1.1 SUMMARY

A. This section specifies work related to demolishing existing wooden walkway, cutting back existing features as necessary, and constructing new wooden walkway and other related accessories.

1.2 SUBMITTALS

A. Provide 2 copies of shop drawings for all timber components for approval including dimensions, finish, and hardware to be used. DO NOT PROCEED UNTIL SHOP

DRAWINGS ARE APPROVED BY CO.

B. Furnish, the following compliance certificates to the CO upon delivery of the materials to the jobsite:

1. Verification of compliance with grading rules and species of timber and lumber. Provide certification by an agency accepted as competent by the American Lumber Standards Committee (ALSC).

2. Lot certification of each charge for preservative, penetration in millimeters, and retention in kilograms per cubic meter (assay method) by a qualified independent inspection and testing agency. In addition, have the producer of the treated products provide written certification that Best Management Practices (BMP's) in accordance with "Best Management Practices for Treated Wood in Western Aquatic Environments," published by the Western Wood Preservation Institute (WWPI) and Canadian Institute of Treated wood, were followed, including a description and appropriate documentation of the applicable BMP's used.

3. Certification from a qualified inspection and testing agency indicating that all glued laminated members are in accordance with the requirements of American National Standard for Wood Products, "Structural Glued Laminated Timber" (ANSI/AITC A190.1) modified as SHOWN ON THE DRAWINGS.

4. Such other certifications as SHOWN ON THE DRAWINGS or called for in the SPECIFICATIONS.

2. PART 2 – PRODUCTS

2.1 MATERIALS AND QUALITY ASSURANCE

A. Hardware and Structural Steel

1. Bolts, nuts, washers, rods, All-thread, and dowels may be of medium steel.

Fabricate washers from gray iron or malleable iron castings unless structural washers are specified.

2. Use square-headed bolts and nuts. Use a standard commercial type of cut or round nail. Use cut, round, or boat spikes as specified.

3. Galvanize all hardware according to AASHTO M 232.

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32340 - 2/5 Timber Walkway

B. Structural Glued Laminated Timber

1. Furnish structural glued laminated timber according to AITC 117, or as specified in drawings. Fabricate according to the combination and grade as indicated in the contract. Fabricate Structural Glued Laminated members according to ANSI/AITC A 190.1, Structural Glued Laminated Timber.

C. Untreated Structural Timber & Lumber

1. Conform to AASHTO M 168. Furnish wood bearing inspection marks from an agency accredited by the American Lumber Standards Committee for the species and grade. Mark all pieces with the inspection service, grade designation, species, and inspector identity.

D. Treated Structural Timber & Lumber

1. Furnish wood according to Subsection 2.1 (C-1). Incise all wood and make all dimensional cuts and holes in the wood prior to pressure treatment. Treat the wood and mark each piece of treated timber according to AASHTO M 133.

Treat glued laminated timber members according to AWPS Standards C14 and C28. Use the type of treatment and minimum net retention of preservative shown in the plans.

E. Incise all glued laminated and solid sawn members thicker than 50 mm in accordance with AWPA standard C1, unless otherwise SHOWN ON THE

DRAWINGS.

3. PART 3 – EXECUTION

3.1 DELIVERY AND STORAGE

A. Clear stacks of weeds, rubbish, or other objectionable material form the ground under and in the vicinity of all stored material. Place the bottom layer of material at least 8 inches above the ground level. Provide sufficient support to prevent sagging.

B. Open-stack untreated material to shed water. Stack material in layers on spacers (stickers) that extend across the full width of the stack to allow for free air circulation. Align all stickers vertically and space them at regular intervals.

C. Close-stack treated material to shed water.

D. Protect material from the weather. If covered, used sheet material such as water-resistant paper or opaque polyethylene film. Do not cover with impervious membranes, such as polyethylene film, during dry weather. Slit individual wrappings full length or puncture on the lower side to permit drainage of water.

E. Store and protect glued laminated timber in accordance with the recommendations for Loading and Handling, Job Site Storage, and Erection in "Recommended Practice for Protection of Structural Glued Laminated Timber During Transit, Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32340 - 3/5 Timber Walkway

Storage, and Erection," published by the American Institute of Timber Construction, AITC 111.

F. Use slings or other devices to protect corners of heavy construction timbers and banded packages of heavy construction timber

3.2 DEMOLITION

A. Demolish and remove from national forest land; the existing walkway, supports, and all other features scheduled for removal per drawings and specifications.

B. Contractor shall preserve and protect all structures, equipment, utilities, and vegetation at or near work site, not scheduled for removal.

C. Promptly dispose of demolished materials. Do not allow demolished materials to accumulate on-site.

D. All removed materials shall be disposed of in an approved landfill in accordance with applicable laws and regulations.

1. Comply with hauling and disposal regulations of authorities having jurisdiction.

2. Remove and transport debris in a manner that will prevent spillage on adjacent surfaces and areas.

3. Clean adjacent structures and improvements of dust, dirt, and debris caused by demolition operations. Return adjacent areas to condition existing before demolition operations began.

3.3 FABRICATION

A. Treated Timber. Fabricate timbers before treatment. Handle treated timber according to the Consumer Information Sheet published by AWPA. Do not cut, frame, or bore treated timber after treatment unless approved by the CO. Handle treated timbers carefully and do not drop, damage outer fibers, or penetrate the surface with tools. Do not use cant dogs, hooks or pike poles. In coastal waters, do not cut or bore timber below the high-water mark.

B. Field treat all cuts, abrasions, bolt holes, and recesses that occur after treatment in accordance with the requirements specified in AWPA standard M4, Standard for the Care of Pressure-Treated Wood Products. Plug all unused holes with preservative-treated plugs. Perform all field-applied preservation treatment with necessary precautions so as to prevent and soil and/or water contamination.

C. Untreated Timber. Field treat the following untreated timber surfaces in accordance with AWPA standard M4.

1. All ends and Tops, and all contact surfaces of posts, sills, and caps.

2. All ends, joints, and contact surfaces of bracing and truss members.

3. All surfaces of timber bumpers and the back faces of bulkheads.

4. All other timber that will be in contact with earth.

D. Workmanship. Cut and form all lumber and construction timbers so all joints will have even bearing over the entire contact surface. Do not use shims in makings joints. Construct all joints to be closed. Drive nails and spikes to set the heads

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32340 - 4/5 Timber Walkway flush with the wood surface. Use the same end, face, and edge of the timber member for all layout dimensions. Bore all holes from mating faces.

E. Holes for Bolts, Dowels, Rods & Lag Screws. Bore all holes before preservative treating the wood. Bore holes for round driftbolts and dowels 2 mm smaller in diameter than that of the bolt or dowel to be used. Ensure that the diameter of holes for square driftbolts or dowels is equal to the side dimension of the bolt or dowel.

F. Bore holes for machine bolts with a bit 1.5 mm larger than the diameter, except when galvanized bolts are specified. In this case, drill all holes 3 mm greater than the bolt size. Drill the depth of lag screw bolt holes 25 mm less than the length of the screw head and with a diameter approximately 75 percent of the shank diameter.

3.4 HARDWARE

A. Hardware. Furnish the hardware as SHOWN ON THE DRAWINGS, as specified below.

B. Bolts & Washers. Final tighten all nuts to provide proper bearing, and cut off excess bolt lengths of more than 25 mm. After final tightening, check or burr all bolts effectively with a pointing tool to prevent loosening of the nuts.

C. Use malleable iron washers with a diameter approximately four times the bolt diameter under all bolt heads or nuts in contact with wood, unless otherwise

SHOWN ON THE DRAWINGS.

D. Galvanizing. Unless otherwise SHOWN ON THE DRAWINGS, ensure that all hardware for timber structures is galvanized, except for the glued laminated deck panel dowels. Ensure that all fasteners, including nails, spikes, bolts, washers, and timber connectors, other than malleable iron, are galvanized.

3.5 FRAMING

A. Framing. Do not slab or trim treated piles for fitting sway or sash braces. Fill all gaps that occur between braces and piles with treated blocks so that the bracing is securely fastened to the piles.

B. Bracing. Make all bracings bear firmly against the pile or cap to which it is bolted.

Provide and place shims as necessary to prevent bending the bracing more than 25 mm out of line when bracing bolts are tightened.

C. Fabricate wooden shims from White Oak or from the same treated wood used in the original structure. Do not use built-up wooden shims. Make wooden shims from a single piece of lumber with the width not less than 100 mm and the length not less then the width of the bracing measured along the cap or pile. Do not adze, trim, or cut any treated member to avoid the use of shims.

D. Stringers. Stringers shall be size matched at bearings and shall be positioned so that the camber is up and if possible, so that knots near the edge will be in the top portion of the stringers.

Rev. Date 05/16 Green Ridge Lookout Walkway Replacement 32340 - 5/5 Timber Walkway

3.6 CONSTRUCTION

A. Timber Walkway

1. General. Cut back existing features as necessary to receive new components.

Perform work as shown on the drawings and described in the specifications.

Furnish structural lumber and timber of the required stress grade.

3.7 METHOD OF MEASURMENT:

A. Timber Walkway

1. Measurement will be made of completed Timber Walkway as shown in the

Drawings and Specifications; excluding Mobilization, Demolition and Disposal, and Geocell Foundation work.

B. Demolition and Disposal of Existing Walkway

1. Measurement will be made of completed demolition, removal, and disposal of existing walkway.

3.8 BASIS OF PAYMENT

A. Payment will be made under:

PAY ITEM DESCRIPTION PAY UNIT

01010-1 Demolition and Disposal Lump Sum 32340-1 Timber Walkway Lump Sum

3. LUMP SUM QUANTITIES (LSQ) - These quantities denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job. They shall not be measured.

C. Use strips with a sheet thickness, of 1.27 mm -5% +10% (50 mil -5% +10%) tested per ASTM D5199. Thickness shall be determined in the flat, before any surface texturing or other surface disruption.

E. Incise all glued laminated and solid sawn members thicker than 50 mm in accordance with AWPA standard C1, unless otherwise SHOWN ON THE DRAWINGS.

E. Incise all glued laminated and solid sawn members thicker than 50 mm in accordance with AWPA standard C1, unless otherwise SHOWN ON THE DRAWINGS.