A1_AG0120S170006_SpecialProjectSpecs.pdf

Attachment 1, AG-0120-S-17-0006, Special Project Specifications

SECTION 901—ABBREVIATIONS, ACRONYMS, AND TERMS

901.01 Terms, Organizations, and Standards

(a) Specification Terms. These specifications are generally written in the imperative mood. In sentences using the imperative mood, the subject “the Contractor,” is implied. Also implied in this language is “shall,” “shall be,” or similar words or phrases. In material specifications, the subject may also be the supplier, fabricator, or manufacturer supplying material, products, or equipment for use on the project. Wherever “directed,” “required,” “prescribed,” or similar words are used, the “direction,” “requirement,” or “order” of the CO is intended. Similarly, wherever “approved”, “acceptable”,” suitable”, “satisfactory”, or similar words are used, they mean “approved by,” “acceptable to,” or “satisfactory to” the CO. The word “will” generally pertains to decisions or actions of the CO. Whenever in these specifications, or in other contract documents, the following terms (or pronouns in place of them) are used, the intent and meaning shall be interpreted as follows: reference to a specific standard, test, testing method, or specification shall mean the latest published edition or amendment that is in effect at the solicitation issue date for the public works contracts.

(b) Abbreviations and Acronyms AASHTO American Association of State Highway and Transportation Officials AGGR Aggregate AQ Actual Quantities ASTM American Society for Testing and Material AWPA American Wood Preservers Association CL Centerline CO Contracting Officer DQ Design Quantities EA Each FBB Full Bench Blasting hr hour LF Linear Feet LS Lump Sum LSQ Lump Sum Quantities MW Miscellaneous Work NW No Work NBS National Bureau of Standards PS Product Standard issued by the U.S. Department of Commerce RA Rest Area SHT Sheet SOD Stone Open Drain SP Stone Pitching SRS Stone Riser Steps SRW Stone Retaining Wall SS Step Stones WCLIB West Coast Lumber Inspection Bureau WWPA Western Wood Products Association

SECTION 902—DEFINITIONS

When the following terms, or pronouns in place of them, are used in these specifications or in other contract documents, the intent and meaning are as follows:

Base Course. The layer or layers of specified material of designed thickness placed on a trailbed to support surfacing.

Batter. A backward and upward slope of the face of a wall.

Berm. The ridge of material formed on the outer edge of the trail that projects higher than the tread.

Borrow. Suitable materials taken from approved sources designated on the drawings or on the ground, to be used for embankments and backfilling.

Bridge. A structure, including supports, erected over a depression or stream, and having a deck to carry traffic.

Catch Point. The outer limits of a trailway where the excavation and/or embankment intersect with the ground line.

Clearing Limit. The area over and beside the trail that is cleared of trees, limbs, and other obstructions.

Compacted. Consolidation that is obtained by tamping or rolling suitable material until no noticeable displacement of material is observed.

Contracting Officer (CO). An official of the Government with the authority to enter into, administer, and/or terminate contracts and make related determinations and findings. The term includes certain authorized representatives of the CO acting within the limits of their authority as delegated by the CO.

Danger Tree. An unstable tree 5 inches or greater in diameter at breast height that is likely to fall across the trail.

Designated on the Ground. The location of materials, work areas, and construction items, including lines and grades, marked on the ground with stakes, flagging, tags, or paint.

Drawings. Documents showing details for construction of a facility, including but not limited to straight-line diagrams, trail logs, standard drawings, construction logs, plan and profile sheets, cross-sections, diagrams, layouts, schematics, descriptive literature, and similar materials.

Duff. Organic material overlying rock or mineral soil.

Embankment. A structure of suitable material placed on the prepared ground surface and constructed to the trailbed elevation.

Excess Excavation. Material in the trailway in excess of that needed for construction of designed trailways.

Ford. A water-level stream crossing constructed to provide a level surface for safe traffic passage.

Full Bench. Trailbed constructed entirely on undisturbed material.

Grade. The vertical distance of ascent or descent of the trail expressed as a percentage of the horizontal distance.

Header Rock. Rock laid with the narrow end towards the face of the wall.

Inslope. Where the trail tread is sloped downward toward the backslope.

Mineral Soil. Soil or aggregate that is free from organic substances and contains no particles larger than 2 inches at their greatest dimension.

Outslope. Where the trail tread is sloped downward toward the embankment or daylight side of the trailway.

Sideslope. The natural slope of the ground, usually expressed as a percentage.

Slough. That material from the backslope or the area of the backslope that has raveled onto the trailbed.

Slump. Where the trailbed material has moved downward, causing a dip in the trail grade.

Special Project Specification. Specifications that detail the conditions and requirements peculiar to an individual project, including additions and revisions to the standard specifications.

Surfacing. Material placed on top of the trailbed that provides the desired tread.

Suitable Material. Rock that can be accommodated in the trail structure, and soil free of duff with a recognizable granular texture.

Switchback. A reverse in direction of trail grade with a level landing used to change elevation on a steep slope, usually involving special treatment of the approaches, barriers, and drainages.

Trailbed. The finished surface on which base course or surfacing may be constructed. For trails without surfacing the trailbed is the tread.

Trailway. The portion of the trail within the limits of the excavation and embankment.

Tread. The surface portion of the trail upon which traffic moves.

Turnout. A short section of extra trail width to provide for passage of trail users.

Waterbar. A structure used for turning water off the trail, usually made of logs or stones.

Water Courses. Any natural or constructed channel where water naturally flows or will collect and flow during spring runoff, rainstorms, etc.

SECTION 903—INTENT OF CONTRACT

903.01 Intent. The intent is to provide for the completion of the project described in the contract. Furnish all labor, materials, equipment, tools, transportation, utilities, and supplies, and perform all work required to complete the project in accordance with drawings, specifications, and provisions of the contract.

The trail is located on a 100’ wide (50’ wide, each side of centerline) planned easement through private land. Any activity outside of the easement, including access via the logging road that accesses the project is on private land and permission for use must be granted by the landowner. The Contractor is responsible for obtaining permission and operating in accordance with the landowner’s requirements.

Small to mid-size equipment such as excavators and track haulers may be used on the trail between Stations 0+00 and 47+14. Between station 47+14 and 71+61 no land-based equipment of this sort is allowed. The use of helicopters in the project area is allowed.

SECTION 904—MAINTENANCE FOR TRAFFIC

904.01 General. Before any suspension of work, take precautions necessary to prevent damage to the project, such as temporary detours, approaches, crossings, or intersections, and make provisions for normal drainage and to minimize erosion.

The trail under this contract will be closed to the public until the project is complete. The contractor is responsible for installing professional-appearing, effective trail closure signs and warnings to the public.

When trail is closed, provide “trail closed” or “trail closed ahead” signs at the main trailhead and at the beginning of the construction area. Provide barriers at the start of the closure. Provide verbal warnings to the public when the trail and staging area are closed.

SECTION 905—CONTROL OF MATERIALS

905.01 Handling Materials. Transport and handle all materials to preserve their quality and fitness for the work. Stockpile, load, and transport aggregates in a manner that will preserve specified gradation and avoid contamination.

Store materials to assure the preservation of their quality and fitness for the work. Locate stored materials to facilitate their prompt inspection. Arrangements for storage on other than designated sites are the responsibility of the contractor.

SECTION 906—MEASUREMENT AND PAYMENT

906.01 General. 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 and materials will be considered incidental and included in the payment of the PAY ITEMS in the SCHEDULE OF ITEMS.

When more than one class, size, or thickness is specified in the SCHEDULE OF ITEMS for any PAY ITEM, suffixes will be added to the item number to differentiate between the items.

906.02 Determination of Quantities. The following measurements and calculations are to be used to determine contract quantities for payment:

Measure Pay Item #1- Mobilization as Lump Sum

Measure Pay Item #2 - Demolition of Staircase near STA 0+00 as Lump Sum

Measure Pay Item #3 - All work STA 0+00 TO STA 21+20 including Clearing and Grubbing, Excavation and Embankment, Drainage; except work in Option Item #1 as Lump Sum

Measure Pay Item #4 - All work STA 21+20 TO STA 47+14 including Clearing and Grubbing, Excavation and Embankment; except work in Option Item #1 as Lump Sum

Measure Pay Item #5 - Double Log Bridge around STA 19+00 as Linear Feet

Measure Pay Item #6 - Culverts, 12” as Linear Feet

Measure Pay Item #7 - Culverts, 18” as Linear Feet

Measure Pay Item #8 - Culverts, 24” as Linear Feet

Measure Pay Item #9 - Aggregate Trail Type A on STA 0+00 to STA 21+20 as Lump Sum

Measure Pay Item #10 - Aggregate Trail Type B on STA 21+20 to STA 47+14 as Linear Feet

Measure Pay Item #11 - Concrete Steps, where designated on STA 21+20 to STA 47+14 as Each

Measure Pay Item #12 & #25 - Sign Posts as Each

Measure Pay Item #13 - Metal Staircase in Linear Feet

Measure Pay Item #14 - Demolition – Existing Single Plank Boardwalk as Lump Sum

Measure Pay Item #15 and #20 - Boardwalk Type A as Linear Feet

Measure Pay Item #16 and #21 - Boardwalk Type B as Linear Feet

Measure Pay Item #17 and #22 - Boardwalk Type C as Linear Feet

Measure Pay Item #18 and #23 - Aggregate Trail Type C as Linear Feet

Measure Pay Item #19 and #24 - Aggregate Trail Type D as Linear Feet

Manufacturer’s tolerances will be accepted unless controlled by tolerances in the cited specifications.

906.03 Units of Measurement. Payment will be made by units defined and determined according to standard measure and by the following:

(a) Each (EA). One complete unit, which may consist of one or more parts.

(b) Lump Sum (LS). The quantities that denote one complete unit of work as required by or described in the contract, including necessary materials, equipment, and labor to complete the job.

(c) Linear Feet (LF). Measurement in feet taken along the centerline of the trail and parallel to the finished grade.

(d) Square Feet (SF). Measurement taken by determining surface area.

906.04 Methods of Measurement. One of the following methods of measurement for determining final payment is DESIGNATED ON THE SCHEDULE OF ITEMS for each PAY ITEM:

(a) Designed Quantities. These quantities denote the final number of 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, and drawings. Changes in the number of units DESIGNATED IN THE SCHEDULE OF ITEMS may be authorized under the following conditions:

(1) As a result of changes in the work approved by the CO.

(2) As a result of the CO determining that errors exist in the original design that cause a PAY ITEM quantity to change by 15 percent or more.

(3) 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.

(b) Actual Quantities (AQ). These quantities are determined from measurement of completed work or certified receipts.

(c) Lump Sum (LS). 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.

(d) Vehicle Quantities (VQ). These quantities are measured or weighed in hauling vehicles. Aggregate woven bags are considered hauling vehicles.

SECTION 907—QUALITY ASSURANCE AND QUANTITY MEASUREMENT

Description

907.01 Work. Work consists of providing certification that the quality and quantity of construction conform to the drawings, specifications, and requirements of the contract.

Construction

907.02 Certification and Measurements

(a) Offsite-Produced Materials. Furnish signed certificates executed by the manufacturer, supplier, or vendor, stipulating that all offsite-produced materials incorporated in the work meet applicable requirements SHOWN ON THE DRAWINGS or stated in the specifications. Furnish a certificate for each commodity or invoice.

(b) Quantity Measurements. Submit quantities to the CO for periodic progress payments, and the CO will compute payments. Quantities are subject to verification.

(c) Submittals. Provide the following submittals for approval. Do not proceed with procuring items or with work covered by the submittal until approval has been given.

1. Provide a plan prior to construction showing the make, model of proposed equipment including excavators, trucks, haulers, helicopters, etc.

2. Provide a staging plan describing material storage locations.

(d) Representative Samples. At approved locations, prepare 10’ representative samples of each type of construction in this contract, The representative samples will serve as a standard of workmanship and materials for other work on the project. Obtain review of the representative samples, correct any deficiencies, and obtain final approval before proceeding with any other Aggregate Surfacing. When accepted, the sample will be incorporated into the work.

Measurement

907.03 Method. There will be no separate measurement for this item.

Payment

907.04 Basis. Payment will be considered incidental to other pay items in this contract.

SECTION 908—MOBILIZATION

908.01 Work. This work consists of moving personnel, equipment, material and incidentals to the project and performing all work necessary before beginning work at the project site. Mobilization includes the costs associated with obtaining permits, insurance, and bonds. Mobilization is not intended to pay for the costs of materials before they are used on the project site.

Payment

908.02 Basis. Pay for the accepted work at the contract unit price for the PAY ITEM SHOWN IN THE

SCHEDULE OF ITEMS.

Make progress payments for mobilization as follows:

(a) Reimburse for bond premiums before issuing the Notice to Proceed if evidence of payment is received.

(b) When 5 percent or more of the original contract amount is earned from other PAY ITEMS, pay mobilization at the rate of 50 percent, or up to 5 percent of the original contract amount, whichever is less.

(c) When 10 percent or more of the original contract amount is earned from other PAY ITEMS, pay mobilization at the rate of 100 percent, or up to 10 percent of the original contract amount, whichever is less.

(d) Pay any unpaid amount for mobilization upon final acceptance of all work items.

908.03 Method. Measure in accordance with Section 906.

SECTION 910—CLEARING AND GRUBBING

910.01 Work. Work consists of clearing and grubbing vegetation as described herein.

Construction

910.02 Clearing Limits.

STA 0+00 to 21+20: Clearing limits are 3 feet minimum each side of trail centerline

STA 21+20 to 47+14: Clearing limits are 6 feet minimum each side of trail centerline.

STA 47+14 to 71+61: Clearing limits are 3 feet each side of trail centerline.

910.03 Material to Be Cleared and Grubbed and Disposal of Cleared and Grubbed material.

STA 0+00 to 21+20: Remove all alder trees including roots from within the clearing limits. Dispose of downhill in a manner that minimizes the visibility of the slash from the trail.

STA 21+20 to 47+14: Cut all vegetation within the clearing limits flush with the ground. Place cleared material, outside of the clearing limits in a manner that minimizes it’s visibility from the trail corridor, or incorporate into the embankment in a manner that does not conflict with the installation of the aggregate trail. Remove large stumps within trailway.

STA 47+14 to 71+61: Cut brush and trees less than 4” dbh. Leave trees larger than 4” dbh located outside the trailway standing except if they hinder passage, as approved. Cut tree limbs and branches within 7 feet of the ground and more than 1/2 inch in diameter that extend into the clearing limits. Cut tree limbs flush with the outside of the branch collar

Entire Project: Do not place clearing and grubbing debris in water courses, snow ponds, lakes, meadows, or in locations where it could impede the flows to, through, or from drainage structures.

Measurement

910.04 Method. There will be no separate measurement for this item.

910.05 Basis. Clearing and Grubbing will be considered incidental to the pay item under which the work is being done, and additional payment will not be made.

SECTION 912—EXCAVATION AND EMBANKMENT

912.01 Work.

STA 0+00 to 21+20: Work consists of installing approximately 17 open cross-drains where staked, and ditches at staked locations.

STA 21+20 to 47+14: Work consists of pioneering the trail route with an excavator, excavation, embankment, and backfill construction required to shape and finish the trailbed, ditches, cross-drains, backslopes, and fill slopes.

STA 47+14 to 71+61: Work consists of hand-excavating for the installation of various types of Aggregate Surfacing and Boardwalks.

912.02 Work

STA 0+00 to 21+20: Smooth roadbed after removing alder trees. Install cross drains measuring 18” wide x 12” deep or as marked leading from ditch to daylight on downslope side of road. Install ditch measuring 18” wide x 12” deep or as staked, where staked.

If Pay Item #9, Trail Type A on STA 0+00 to STA 21+20, is awarded, prepare roadbed by removing rocks protruding more than 3” above the surface and rake away organic matter. Place aggregate directly on prepared roadbed.

STA 21+20 to 47+14: Pioneer a bench with an excavator generally following flagged line but making adjustments as necessary to maintain 18% maximum centerline grade. Adjust alignment where possible to place trailbed on solid mineral soil. Rough-in the ditching and culvert locations as construction proceeds so drainage is collected and does not run across bench.

After bench is pioneered, the COR will stake the final trail centerline and ditches and culvert locations. This may be outside of the pioneered bench in some locations to accomplished proper finished grade or for other reasons. After staking, complete pioneering in staked location to grades specified, and install final ditching and culverts. Install Aggregate Trail Type A if that Option item is awarded.

STA 47+14 to 71+61: Conserve and use soil and herbaceous vegetation and moss removed during excavation to revegetate excavated areas to provide a neat appearance and to control erosion.

Place excess and unsuitable excavation beyond the downslope edge of the trailbed, except in locations where the material would be placed within 5’ of a stream or in staked locations where it is desirable not to impact the native vegetation; in these locations place in approved locations. Do not obstruct drainage and spread to a depth not exceeding 4 inches. This includes any material removed in the grubbing operation and deposited in the same area.

Remove organic soil to the depth required to accommodate the aggregate surfacing and provide the finished grades specified on the drawings.

Obtain approval of trailbed prior to placing, aggregate surfacing, and concrete steps.

912.03 Cut and Fill Slopes. Construct trail so cut and fill slopes are less than the angle of repose. Trim exposed roots flush with the finished cut slope.

912.04 Method. Measure in accordance with Section 906.

912.05 Basis. Excavation and Embankment will be considered incidental to the pay item under which the work is being done, and additional payment will not be made.

SECTION 913 - DEMOLITION OF ABANDONED TRAILS

911.01 Work. This work includes the demolition and disposal of the old boardwalk in two areas.

911.03 Demolition of staircase in the vicinity of STA 0+00. Cut posts within 6” of the ground and cut staircase into pieces and place out of sight of the proposed trail as seen from around STA 0+00. Bend over or remove protruding nails.

911.04 Demolition of Single-Plank Boardwalk. Select most competent material and use as Corduroy under Aggregate Trail Type C as approved. Remove unused material, including all planks, sill, nails, etc.

from the project area and dispose offsite.

911.05 Method. Measure in accordance with Section 906.

SECTION 921—CULVERTS

921.01. Culverts. This work consists of furnishing and installing culverts without headwalls, including excavation and backfill, selecting and hauling of log and rock materials, and constructing catch basins.

Materials

921.02 Requirements. Use black polyethylene pipe that is corrugated on the exterior and smooth on the interior meeting the requirements of ASTM F 714.

921.03 Excavation and Embankment. Perform excavation and embankment in accordance with Section 912.

921.04 Placement. Place culverts to provide for unobstructed inlet and outlet flow. Remove logs, debris, soil, rock, and other obstructions above and below the culvert that would impede flow into the culvert or away from the trailway. Minimize disturbance to streambeds.

Construct a catch basin to facilitate flow from trail ditches into the culvert.

921. 05 Installation. Install culverts of the types and at the locations as DESIGNATED ON THE GROUND.

(a) Placing. Skew ditch relief culverts as staked to provide a downgrade equal to or greater than the uphill ditch. Place culverts at stream crossings in the natural streambed on stream grade.

Attach end sections to the pipe by connecting bands or other means as recommended by the manufacturer.

(b) Bedding. Excavate and remove all unsuitable material and rocks over 3 inches to a minimum depth of 6 inches below the pipe invert and to a minimum width of 1.5 pipe diameters. Bed pipe with compacted suitable material free of rocks larger than 3 inches and in a stable foundation of undisturbed or compacted soil. Make the bed shaped to fit the lower quadrant of the pipe exterior and provide uniform continuous support along the entire length of the pipe.

921.06 Backfilling. Backfill and compact around culverts with suitable material that is free of rocks over 3 inches. Provide for the cover height as SHOWN ON THE DRAWINGS.

921.07 Method. Measure in accordance with Section 906.

SECTION 936—METAL STAIRCASE – NOTE: The aluminum staircase structural design is not complete. Final structural design will be issued as an amendment to the solicitation.

938.01 Work. This work consists of constructing Type: Staircase

938.02 Aluminum Members. Provide 6061-T6 grade aluminum, ASTM B 221. Comply with Table 938-1.

Table 938-1 Aluminum Member Description Carriage Aluminum Association Standard Channel: CS 10 X 8.36 Support post Pipe: NPS 2 1/2, Schedule 40, 60 inches long Support post bottom plate 3/16 inch aluminum plate Post sleeve Pipe: NPS 3, Schedule 80 Post sleeve cap Sized to thread onto post sleeve Post sleeve stabilizer Angle – Equal Leg: L 1 X 1 X ¼ Post sleeve mount Aluminum Association Standard Channel: CS 10 X 8.36 Handrail post Square Tube: RT 2 X 2 X 1/4 Handrail mount 3/16 inch aluminum plate Handrail post mount Aluminum Association Standard Channel: CS 10 X 8.36 Ledger Angle – Equal Leg: L 2 X 2 X 3/16 Bearing flange 1/2 inch aluminum plate.

Bearing plate 3/8 inch aluminum plate Splice channel 3/8 inch bent aluminum plate. Cold bend a channel section to fit within carriage member.

Splice plate – flange 1/2 inch aluminum plate Upper footing connection tab 1/2 inch aluminum plate.

938.03 Filler Alloy. Use filler alloy ER5356, or an acceptable alternate approved by the CO.

938.04 Staircase Treads. Provide fiberglass reinforced plastics molded stair treads by Fibertred® (800- 527-4043, info@fibergrate.com) or approved equal. Color: gray. Cut treads to dimensions indicated on the submitted shop drawings, see 938.07. Treat all areas hewn, notched, cut, or drilled, with resin sealing kit in accordance manufacturer’s instructions. ASTM E84 rating: 25 or less.

938.05 Hardware. For bolts, nuts, and washers, provide ASTM Type 316 stainless steel hardware. Use washers under bolt heads and nuts.

In addition to stainless steel hardware, provide polymer washers to separate each stainless steel washer from aluminum.

Provide expansion anchor bolts for concrete where SHOWN IN THE DRAWINGS. Submit the following for approval by CO prior to acquisition of expansion anchor bolts:

(a) Concrete anchorage device sample

(b) Manufacturer’s installation instructions

(c) Material data and certifications

Use type 316 stainless steel, type “M” hold-down clips to fasten treads to ledgers.

938.06 Mastic. Provide bituminous material to protect aluminum from concrete. Submit the following for approval by CO prior to acquisition of bituminous material:

(a) Manufacturer’s application instructions

(b) Material data and certifications

Fabrication

938.07 Staircase Log.

Table 938-2 Staircase Identifying Number Length (ft) Finished Slope (degrees)

1 26 24.0 2 18 25.0 3 38 32.5 4 25 28.5 5 34 36.0 6 34 24.5 7 20 22.0 8 26 21.0

938.08 Shop Fabrication Schedule. Submit a shop fabrication schedule to the CO prior to fabrication. Do not commence fabrication prior to CO approval of submitted shop fabrication schedule.

Shop fabrication schedule to include the following for each staircase: riser height, tread depth, tread underlap, tread width, ledger length, bearing flange length, splice locations, number and location of support posts, and number and location of handrail posts. Also include weld design for handrail mount and bearing flange.

938.09 Standards. Comply with Aluminum Association specifications for aluminum structures. Comply with AWS D1.2, most recent edition.

938.10 Inspection. During fabrication, the Government will conduct visual inspection of materials, welding equipment, worker qualifications, and the work.

Portions of the work may be rejected if inspection discovers deficiencies.

938.11 Mastic. Completely cover the following areas with approved bituminous material:

(a) Bottom of bearing flanges

(b) All surfaces of bearing plates, excluding portion within support post

(c) Exterior surface of support posts, excluding upper 18 inches

(d) Vertical portion of upper footing connection tabs which faces away from the carriages

(e) Upper ends of carriages which lie in the same plane as the portion of the connection tabs mentioned in section 938.11 (d)

Apply bituminous material in accordance with manufacturer’s installation instructions. When staircases are installed on concrete footings (NIC), bituminous material will prevent direct contact between aluminum and concrete. Bituminous material is also intended to prevent direct contact between soils and support posts and bearing plates.

938.12 Method. Measure in accordance with Section 906.

SECTION 936—METAL STAIRCASE

Materials

936.02 Wood Handrail. Provide 2 x 2 Alaskan Yellow Cedar handrails with ½” round over, all four corners.

Cedar to be clear of knots and other defects. Provide minimum number of splices, 16 feet length minimum.

Provide handrails for the descending right side of the staircases.

936.03 Reinforced Concrete for Aluminum Staircases. Provide Type I or Type II concrete. Conform to Table 936-2.

Table 936-2 Property Specification

Cement content 611 pounds per cubic yard minimum Water/cement ratio 0.49 maximum Slump 5 inches maximum Air content 4 % minimum Size of coarse aggregate AASHTO M 43 with 100% passing the 1.5 inch sieve 28-day compressive strength 3,000 pounds per square inch minimum

Do not use calcium chloride or admixtures containing chloride from sources other than impurities in admixture ingredients.

936.04 Reinforcing Bar. Provide ASTM A615 Gr 60 no. 4 steel reinforcing bar.

Installation

936.05 Footings. Obtain government approval of subgrade before pouring footings.

Remove and dispose of existing organic and/or unsuitable material below bottom of proposed footings.

Excavate to competent bearing material.

Remove exposed tree roots on or in the proposed footing location that are greater than 1/8" in diameter.

Scatter removed roots on the lower side of the trailway beyond the clearing limits and outside of water courses. Fill holes caused by rock and root removal with suitable material and compact to form a smooth subgrade.

Place and compact D1 aggregate at a minimum 3 inch thickness below bottom of footing. Compact by hand over the full area of each layer until visual displacement ceases. Following compaction, correct any irregularities or depressions that develop by adding or removing material until the surface is smooth and uniform.

After completing footing work and allowing for concrete to cure (see 936.07), backfill with excavated material.

Where staked on ground by Government, provide slope armoring to hold fill underneath upper concrete footing. Use rip rap, minimum size: class 3, or Alaskan Yellow Cedar logs, minimum diameter: 8”. Obtain approval for method used to secure slope armoring to soil.

936.07 Concrete Placement. Prepare formwork to provide adequate strength to prevent bulging or movement. Moisten surface that will contact concrete immediately prior to pouring.

Clear subgrade of excess moisture and ponding. Remove all unsuitable material per 936.06.

Obtain approval of the placement of the reinforcement prior to pouring. Do not use plastic supports. Provide 2 inches clear cover for all reinforcement.

Place concrete to avoid segregation of materials. Do not exceed 30 minutes between delivery of batch for a single pour.

Finish surface to a medium broom texture free of large aggregates or voids.

Cure concrete a minimum of 7 days. Protect curing concrete from rain or weather for a minimum of 2 days by covering with a water-impermeable barrier.

936.08 Carriage Height. Install carriages to follow the ground profile and to be 12 inches maximum between bottom of carriage and ground. Higher installations may be approved by C.O. in situations where site conditions make 12 inch height infeasible.

936.09 Handrail. Install one continuous handrail on the descending right side of the staircase.

Terminate the upper end of handrails at a point directly above a point 6 inches back from the nosing of the top riser of the flight. Terminate the lower end of handrails at a point directly above the nosing of the lowest riser of the flight.

Upper-most and lower-most handrail posts on each staircase to be installed as close to the carriage ends as possible.

If splice is necessary, install splice directly above handrail post.

936.10 Method. Measure in accordance with Section 906 and the following:

936.11 Basis. Pay for the accepted quantities in accordance with Section 906 at the contract unit price for each PAY ITEM SHOWN IN THE SCHEDULE OF ITEMS.

Make payment under:

PAY ITEM PAY UNIT

936(01) Staircase Installation……..…………….………………LF (Linear Feet) or LSQ

SECTION 938—BOARDWALKS

938.01 This work consists of Boardwalk Type A, Boardwalk Type B, and Boardwalk Type C.

938.02 Timber. Boardwalk lumber to be full-dimension, rough sawn, Grade #1 or Btr. Species to be Alaska Yellow Cedar or Western Red Cedar.

938.03 Net Non-Skid Surface. Use nylon salmon seine net, 3-1/4"x #60 100MD DB&T BRD, as available from Seattle Marine, 1-800--426-2783 or 206-285-5010, Attn: Mike Nord, or approved equal. Attach with ½” Arrow stainless steel or monel rusproof staples. Stretch net over sides and stable to sides /end and on surface to securely hold down net and provide a neat appearance. .

938.04 Nails. Provide stainless steel, Grade 304, spiral shank nails.

938.05 Boardwalk. Miter decking joints at sills to achieve a tight fit. Leave 3/8" gap between decking planks. Install planks crown side up and selectively match adjacent planks to ensure a maximum elevation difference of 1/4". If boards contain wane, place the wane side down.

938.06 Net non-skid. Wrap net over edges of decking boards. Install net so finished product is stretched tight. Staple at rate of approximately 15 staples per square foot. Staple edges 3” on center minimum. Use squeeze or power type stapler for accurate placement and full embedment. Make all cuts to net neatly for clean installation.

938.07 Method. Measure the quantities in accordance with Section 906.

938.08 Basis. Pay for the accepted quantities in accordance with Section 906.

SECTION 941—AGGREGATE TRAIL CONSTRUCTION

941.01 Work. The work consists of constructing Aggregate Trail Type A, Aggregate Trail Type B, Aggregate Trail Type C, and Aggregate Trail Type D.

941.02 Handling Materials. Stockpile, remove, transport, and spread aggregates in a manner that will preserve specified gradation and avoid contamination.

941.03 Aggregate Surfacing. For all Aggregate Trail Types, provide 1-1/2” minus, well graded crushed rock. Provide a sample for approval prior to delivery to the project site.

941.04 Seed-Free Aggregate. Provide aggregate materials that are free of viable seeds or vegetative material. Ensure that contamination does not occur from equipment and tools used to handle aggregate or construct trail. Thoroughly wash all equipment and tools that come into contact with aggregate or are used at the work site, to remove all soil, debris, and other material that could contain seed or vegetative material.

Use only aggregate from an active stockpile that is certified weed free. Provide notification one week before moving material from the source facility to allow inspection.

941.04 Geotextile. PermaTex Woven Geotextile #2200 or equivalent.

941.05 Trailbed Preparation and Approval. See Specification 912.03.

941.06 Placing Geotextile. Install geotextile per manufacturer’s recommendations.

941.07 Handling of Aggregate. Contain aggregate in woven bags until it is installed on the trail. Do not place aggregate directly on the ground outside of the trailway without a tarp or some other means of separation.

941.08 Compaction and Finished Grading. For Aggregate Surfacing (AS), compact firmly by hand.

Following final spreading, smoothing and compaction, correct any irregularities or depressions that develop by adding or removing material until the surface is smooth and uniform.

941.09 Acceptance, Testing, Sampling, and Tolerances. Provide the minimum compacted thickness of aggregate surfacing shown on the Construction Log. If excess aggregate has been delivered to the work area it may be stockpiled in approved locations or spread evenly over the trail; the method to be approved and at no cost to the Government.

Do not vary the aggregate width by more than ± 2 inch from the specified width or place it consistently narrower or wider than the specified width, except as SHOWN ON THE DRAWINGS.

941.10 Aggregate Stockpiled Near Trail. Stockpile aggregate surfacing (not from native sources) at discreet and dispersed locations near the reconstructed portion of the trail. Place aggregate where staked on the ground by the government. Leave aggregate in the bags.

941.11 Method. Measure the quantities in accordance with Section 906.

SECTION 942- CONCRETE STEP

942.01 Work. This work consists of preparing the trailbed and furnishing, hauling, and placing aggregate base course and Concrete Steps (CS).

942.04 Concrete Steps. Provide precast concrete steps as provided by Northwest Precast, 212 10th St SE, Puyallup, WA 98372, ph. (253) 770-9119. Steps to be manufactured the same as existing Concrete Steps installed on Sunnahae trail previously that were manufactured by Northwest Precast.

Steps to be manufactured supplier’s facility under controlled circumstances. Provide sandblasted finish on top and front face. Provide 10,000 psi concrete mix precast steps for approval prior to fabrication.

942.05 Trailbed Preparation and Approval. See Specification 912.03.

942.06 Handling of Aggregate. Do not place aggregate directly on the ground outside of the trailway without a tarp or some other means of separation. Do not allow the aggregate to become contaminated by seeds.

942.07 Compaction and Finished Grading. For Aggregate Base Course, compact firmly by hand.

Following final spreading, smoothing and compaction, correct any irregularities or depressions that develop by adding or removing material until the surface is smooth and uniform.

942.08 Acceptance, Testing, Sampling, and Tolerances. Provide the minimum compacted thickness of aggregate surfacing shown on the Reconstruction Log. If excess aggregate has been delivered to the work area it may be stockpiled in approved locations or spread evenly over the trail; the method to be approved and at no cost to the Government.

942.09 Representative Sample. Provide 2 samples of the precast concrete step and obtain review and approval prior to installation of steps. Prepare a 10’ representative sample of four Concrete Steps (CS) at an approved location that will serve as a standard of workmanship and materials for other work on the project. Obtain review of the representative sample, correct any deficiencies, and obtain final approval before proceeding with like work. When accepted, the sample will be incorporated into the work.

942.10 Method. Measure the quantities in accordance with Section 906. Aggregate Base Course in Concrete Steps work area is incidental to Type CS Pay item.

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SECTION 951 – SIGNS

951.01 This work consists of furnishing and installing signs, posts, including excavation, backfill, and associated materials and hardware.

Material

951.02 All materials shall conform to Forest Service EM-7100-15, Sign and Poster Guidelines for the Forest Service or as SHOWN ON THE DRAWINGS.

951.03 Signs to be provided by: Rockart Signs and Markers (www.rockartsigns.com) or approved equivalent.

951.04 Shop drawings for each sign to be provided for CO’s approval.

951.05 General. Erect signs and posts of the type and at the locations as DESIGNATED ON THE GROUND.

951.06 Post Installation. Set posts to be plumb. Backfill the post holes with suitable material in 6 inch layers and compact material to produce a solid installation.

951.07 Measure the quantities in accordance to Section 906.

http://www.rockartsigns.com/

SECTION 961- LOG STRINGER TRAIL BRIDGE

961.01 This work consists of constructing native double log stringer bridges, including mud sills, bulkheads, rail systems, curbs, decking, excavation, backfill, and approach fills as SHOWN ON THE DRAWINGS.

961.02 Materials. The location of trees for native timber materials will be as identified by the CO on the ground.

961.03 General. Construct native log stringer trail bridges at locations as DESIGNATED ON THE GROUND.

Pre-drill holes for fasteners when necessary to prevent splitting and drive spikes flush. Use washers with lag screws and bolts.

961.04 Excavation and Embankment. Perform excavation and embankment in accordance with Section 911.

961.05 Hardware. Furnish and install hardware as SHOWN ON THE DRAWINGS.

961.06 Mud Sills. Construct mud sills at each end of the span in the location staked on the ground. Construct mud sills to be level, bedded evenly, and buried to the depth necessary for the bottom of the log stringers to clear the ground surface by a minimum of 6 inches.

Hew sill logs to provide a bearing surface for the log stringers and to provide the log stringers with a level top surface. Do not hew sill logs more than one-third their diameter. Do not level the top surfaces of the log stringers by shimming or notching their ends.

961. 07 Stringers. Fasten log stringer to each mud sill with a drift pin that penetrates a minimum of 8 inches into the mud sill.

When plank decking is used, hew the top surfaces of log stringers up to 2 inches deep, as necessary, to provide bearing surfaces for deck planks.

961.08 Decking. Spike decking evenly at right angles to each stringer, unless otherwise SHOWN ON THE

DRAWINGS.

Lay split log decking alternately flat side down first, then round side down, ending with a flat side down.

When the round side is down, provide a bearing surface that is between 1½ inches and 2 inches wide.

Lay split and sawn deck planks on the stringer to provide bearing for the full width of the plank.

Trim protruding ends of the decking to give a straight-line appearance to the edges of the structure, except for decking that extends out to provide handrail support.

961.09 Approach Fills. Construct the approach fills with compacted suitable material.

961.10 Measure the quantities in accordance to Section 906.