specifications.doc

SPECIFICATION LISTING

IDITAROD NATIONAL HISTORIC TRAIL – MIDPOINT ACCESS, MIDPOINT ACCESS TO TINCAN, & JOHNSON PASS NORTH TO TINCAN

CHUGACH NATIONAL FOREST

SPECIFICATION NUMBER

SPECIFICATION TITLE

EM-7720-103 (September 1996) “STANDARD SPECIFICATIONS FOR CONSTRUCTION AND MAINTENANCE OF TRAILS” is incorporated by reference. Note: This document is out of print from the Government Printing Office. It can be obtained electronically from:

http://www.fs.fed.us/r1/helena/contracting/96_Trail_Specs_English.pdf The following sections shall apply to this contract:

SI (Metric) to English Conversion Factors

Abbreviations, Acronyms & Terms

Definitions

Intent of Contract

Maintenance for Traffic

Control of Materials

Measurement and Payment

Quality Assurance and Quantity Measurement Staking, Flagging, and Cleanup Clearing and Grubbing Excavation and Embankment Turnpike Culverts Log Stringer Bridge Puncheon Mobilization

Material for Timber Structures Drainage Pipe Geosynthetics THE FOLLOWING SPECIAL PROJECT SPECIFICATIONS APPLY TO THIS CONTRACT [included in full text herefollowing]:

Geocell Abutment Stabilization

Geocell

Abbreviations, Acronyms and Terms (February 2006) Control of Materials (August 2006) Measurement and Payment (February 2006) Staking, Flagging, and Cleanup (February 2007)

Turnpike (February 2005) Log Stringer Bridge (January 2007)

Water Pollution Prevention (February 2006)

Material for Timber Structures (February 2007) Section 260 - Geocell Abutment Stabilization

Description

260.01 Work. Construct geocell abutment stabilization at each abutment using Presto Geoweb Cellular Confinement System, Webtec TerraCell, or approved equal in accordance with the plans and manufacturers recommendations.

Materials

260.02 Requirements. Ensure that material conforms to specifications in the following subsections:

Coarse Granular Backfill

703.03

Geocell

Geotextile, Type IV (A,B,C.D,E, or F)

714.01

Construction

260.03 General. Perform the work specified in Section 206. Use ditches, grading or similar methods to prevent surface runoff that may occur during inclement weather from ponding in the foundation excavation.

260.04 Geotextile Installation. Place the geotextile according to Section 221 or 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.

Lay the geotextile without tension, stress, wrinkles or creases. Sew or overlap adjacent strips a minimum of 12” at joints. Insert securing pins through both strips of overlapped geotextile at minimum intervals of 3 feet, but no closer than 2 inches to each edge, to prevent the geotextile from being displaced.

Have the installed geotextile approved by the CO prior to setting the geocells.

260.05 Geocell Installation. 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 to the lines SHOWN ON THE PLANS.

Connect geocell panels in accordance with the manufacturer’s recommendations.

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

Place coarse granular backfill meeting subsection 703.03 into the expanded cells with equipment appropriate for the site conditions such as a backhoe or a front-end loader. Do not drop infill material more than 3 feet to avoid damage or displacement of the cell walls.

Overfill the geocell cells and level to a minimum of 2 inches above the top of the cell walls. A front-end loader may be used to place the infill provided that it only traffics above geocell sections that have been filled and covered with the minimum 2 inches of additional material. 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 the cell walls are not exposed after fine grading is completed.

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

Measurement

260.07 Method. Use the method of measurement that is DESIGNATED IN THE SCHEDULE OF ITEMS.

Payment will be based on the contract unit price of geocell material placed and accepted. This will be exclusive of wastage and material placed outside the neat lines SHOWN ON THE PLANS.

Payment

260.08 Basis. The accepted quantities will be paid for at the contract unit price for the PAY ITEM DESIGNATED IN THE SCHEDULE OF ITEMS.

The cost for furnishing and placing the Coarse Granular Backfill required for geocell infill is incidental to this pay item and no separate payment will be made.

The cost for furnishing and placing geotextile for the geocell installation is incidental to this pay item and no separate payment will be made.

Payment will be made under:

Pay Item

Pay Unit

260 (01) Geocell abutment stabilization, __inch depth

Square Yard

Section 726 - Geocell 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.

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

(a) Density ………………………… 0.935-0.965 g/cm3 per ASTM D1505

(b) Environmental Stress

Crack Resistance (ESCR) ……… 2000 hour per ASTM D1693 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.

Ensure that cell seam strength is uniform over the full depth of the cell. Test short-term peel strength per U.S. Army Corps of Engineers Technical Report GL-86-19, Appendix A. Provide a minimum seam peel strength of 2000 N (450 lb) for the 203 mm (8.0 in) depth cell.

Test seam hang-strength for a period of 30 days minimum at room temperature. Room temperature is defined in ASTM E41. Use test samples made by welding two 102 mm (4 in) wide polyethylene strips together. Ensure that a test sample consisting of two carbon black stabilized strips supports a 72.5 kg (160 lb) load for the test period and that a test sample consisting of carbon black stabilized strip and a HALS stabilized strip supports a 63.5 kg (140 lb) load for the test period.

Furnish the CO with a certificate signed by a legally authorized official from the company that manufactured the geocell. Ensure that the certificate attests that the geocell meets the chemical, physical, material and manufacturing requirements stated in the specification. When requested by the CO, furnish a sample of the geocell from each lot for verification testing.

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.

Section 901 – Abbreviations, Acronyms, and Terms

901.01 Terms, Organizations, and Standards

(b) Abbreviations and Acronyms. Add the following:

CP

control point

C.Y.

cubic yard

FT

foot

LB pound

L.F. linear foot

MI miles

RP

reference point

SS

slope stake

S.Y. square yard

“ inches

‘ foot

(c) SI slope notation (vertical:horizontal). Delete this entire subsection and substitute the following:

(c) Slope notation. Express all slopes as the ratio of a number of units horizontal to one unit vertical.

Section 905 – Control of Materials

905.02 Material Sources Add the following to the end of this subsection:

(c) Native Materials. Sources of native materials such as cushion material, mineral soil, suitable material, and logs are available on the project. If native materials are unavailable at construction site(s), materials shall be imported from within the construction limits or other approved areas for a horizontal distance of up to 300’.

Section 906 – Measurement and Payment

906.02 Determination of Quantities. Add the following to the second paragraph:

Do not include overlap when measuring quantity for payment of geotextiles.

906.03 Units of Measurement. Delete the first two sentences of this subsection and substitute the following:

Payments will be made by units defined and determined according to Standard English measure and by the following:

(a) Cubic Yard. A measurement computed by one of the following methods:

906.03 Units of Measurement. Add the following text to the end of this subsection:

Standard Specifications for Construction and Maintenance of Trails (EM-7720-103) are based on modern metric units of measurement. The dimensions and units of measure SHOWN ON THE DRAWINGS and used to develop SPECIAL PROJECT SPECIFICATIONS for this contract, utilize U.S. Standard English units of measure. All measurements, material requirements, and other International System of Units referenced in the EM-7720-103 shall be converted to U.S. Standard English units of measure. SI (Metric) to English Conversion Factors is included in the EM-7720-103 to assist with any required conversions.

Work required by the contract will be paid based on the PAY UNIT (U.S. Standard English measure) as DESIGNATED IN THE SCHEDULE OF ITEMS.

Under each Specification Section with PAY ITEMS of work DESIGNATED IN THE SCHEDULE OF ITEMS for measurement and payment under this contract, the last subsection “Payment - Basis” shall have the following format:

PAY ITEM – Numbering system and work description to remain the same unless modified by Special Project Specification.

PAY UNIT – These units DESIGNATED IN THE SCHEDULE OF ITEMS have been changed from metric to corresponding unit of U.S. Standard English measure.

Section 908 – Staking, Flagging, and Cleanup

Delete this section and substitute the following:

Description

908.01 Work. The work consists of establishing any control points needed in addition to existing staking, reestablishing and staking centerline, and removing and disposing of all construction stakes, tags, flagging, and plastic ribbon from the project area.

Furnish all labor, equipment, materials, transportation and other incidentals necessary to complete the work in accordance with these specifications and acceptable engineering practice.

Materials

908.02 Stakes. Provide wooden stakes that have approximate dimensions of 1.5” x 0.5” x 24”. Other dimensions and materials may be used if approved in writing by the CO. Ensure stakes are of sufficient length to provide a solid set in the ground and space for marking above ground when applicable. Paint the top 2” of all stakes or mark with orange plastic flagging.

908.03 Supporting Services and Documents. The Government will set initial construction stakes, or flagging and control points, and furnish the contractor drawings, control point tables, and where applicable survey data as needed for the contractor to stake the centerline. Return all survey data to the CO.

908.04 Location Survey Line. A location line for this project has been established on the ground.

Furnish and maintain all additional stakes, flagging, templates, batter boards, and other materials and supplies necessary for marking and maintaining points and lines established. Do not perform work in the absence of control points.

Construction

Set centerline stakes at a maximum interval of 100’. Use survey methods that will insure precision of 1/100. In areas of trail restoration the existing trail alignment will constitute the design location. Offset stakes in restoration segments to the uphill side of the trail as needed. In all other areas control points, existing stakes, flagging, and survey data shall be used to reestablish the design location line. These stakes and flagging constitute the field control.

Remove all construction stakes, tags, flagging, and plastic ribbon from the project area within 10 days after final inspection of all other work on the project. Dispose of all stakes, tags, flagging, and plastic ribbon off Government administered land unless otherwise designated.

Section 908 – Staking, Flagging, and Cleanup (continued)

908.05 Marking Stakes. Mark all stakes with a stake pencil that leaves an imprint, or with waterproof ink, in a format approved by the CO. Display the centerline station on the stake facing back toward the project beginning, or trail centerline if stakes are offset.

908.06 Approval & Maintenance. Do not begin construction work within a trail segment until the stakes and marks established are approved in writing by the CO. The CO shall begin audits on completed centerline staking segments within three business days following formal request from the Contractor. The minimum segment for approval shall be 1 mile or the length of the project, whichever is less.

Approval of centerline staking shall not relieve the Contractor of responsibility for maintaining the survey work until construction has been completed and accepted, and for correcting errors made by the contractor.

Measurement

908.07 Method. Determine the quantity of centerline staking by measuring the slope distance along the trail centerline.

Payment

908.08 Basis. Make payment, for all units inspected and accepted, at the unit price SHOWN IN THE SCHEDULE OF ITEMS.

Make payment under:

PAY ITEM PAYUNIT

908(01) Centerline Staking ……………………………………………... L.F.

Section 913 – Turnpike

Construction

913.07 Drainage. Delete the text of this subsection and replace with the following:

Construct side ditches at all locations requiring turnpike unless otherwise SHOWN ON THE DRAWINGS and/or DESIGNATED ON THE GROUND. Construct cross-drainage and culverts at locations SHOWN ON THE DRAWINGS and/or DESIGNATED ON THE GROUND. Provide leadoff ditches from side ditches on the lower side of trail at points DESIGNATED ON THE GROUND or SHOWN ON THE DRAWINGS.

Section 931 – Log Stringer Bridge

Materials

931(02) Requirements. Delete the text of this subsection and replace with the following:

The location of trees for native timber materials will be DESIGNATED ON THE GROUND. Native materials are located within 300’ of the bridge site(s). Use materials meeting the requirements of section 962.

Construction

931.03 General. Add the following to the end of this subsection:

One crossing is permitted at each bridge site in accordance with conditions outlined in the Best Management Practices and approved by the CO. Thereafter, do not operate machinery within the ordinary high water limits as DESIGNATED ON THE GROUND. When available utilize existing bridge structures to transport equipment and materials.

931.05 Mud Sills. Delete the last sentence of this subsection.

931.09 Handrails. Delete the first sentence of this subsection and replace with the following:

Construct rails with logs AS SHOWN ON THE DRAWINGS and use lengths greater than or equal to 10’. Install handrail on both sides of the bridge superstructure.

Section 956 – Water Pollution Prevention (Added Section)

Description

956.01 Work. The work consists of construction controls to protect the environment, facilities, machinery, workers, and the public from damage or injury.

Furnish all labor, equipment, materials, transportation and other incidentals necessary to complete the work in accordance with these specifications and Best Management Practices (BMP’s).

Rules and Regulations

956.02 Methods. All construction methods and procedures shall be in compliance with the State of Alaska, Department of Labor, Division of Occupational Safety and Health, Construction Standards and the State of Alaska, Division of Labor Standards. The contractor shall become familiar with current OSHA rules and observe these regulations at all times during the term of this contract.

956.03 Camping and Sanitary Facilities. Permits are required to camp on National Forest Lands. Permits may be obtained from the Glacier Ranger District Office. The contractor shall provide sanitary facilities at or near camp sites in accordance with all State of Alaska and Local Sanitation Codes.

Storm Water Pollution Prevention Plan (SWPPP)

956.04 Provisions. Address provisions outlined in 40 CFR 122.26, EPA’s General Permit Construction Activities 64 FR 68722 and EPA 832-R-92-005 and include at a minimum the following:

(1) Identify potential sources of pollution which may reasonably be expected to affect the quality of storm water discharge from the site(s).

(2) Select applicable BMP’s from EPA 832-R-92-005.

(3) Describe and ensure implementation of BMP’s which will be used to reduce the pollutants in storm water discharge at the construction site(s).

(4) Ensure compliance with the terms of EPA’s 64 FR 68722 for storm water discharge.

(5) Provide a completed signed original of the Notice of Intent and Notice of Termination (except for effective date), to comply with EPA’s General Permit for Construction Activities 64 FR 68722.

Section 956 – Water Pollution Prevention (continued)

Cleanup and Disposal

956.05 Requirements. Remove all temporary facilities and construction controls upon completion of the work unless otherwise required or approved by the CO. Leave work area clean and free of all debris associated with this section of work.

Measurement

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

Payment

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

Section 962 – Material for Timber Structures

962.01 Timber. Add the following paragraph to the end of this subsection:

TIMBER, LUMBER AND BOARDS

A. Alaska Yellow Cedar, tight knot, selected for appearance, resawn to standard nominal dimensions except where special shapes are specified or indicated. Sizes as indicated on drawings.

B. Moisture content of no more than19%, for lumber under 2” thick and 25% maximum for lumber over 2” thick.

C. Sawn bulkheads, deck spacers, sawn timber decking, and curbs shall be Alaska Yellow Cedar grade No. 2 or better.

962.04 Preservative. Delete the first sentence of the first paragraph and substitute the following:

Use wood preservative treatment methods meeting the requirements of AASHTO M 133 and the last paragraph to this subsection as SHOWN ON THE DRAWINGS.

Delete the last sentence of the third paragraph and substitute the following:

Field treat, with Copper Napthanate or approved equal, any area hewn, notched, cut, or drilled after initial preservative treatment.

962.04 Preservative. Add the following paragraph to the end of this subsection:

Mud sills, stringers other than native log, and sawn timber retainers may be Alaska Yellow Cedar or Western Hem-Fir grades No. 2 or better. Western Hem-Fir shall be pressure treated with Copper Napthanate having a minimum retention rate of 0.06 pcf (pounds per cubic foot) or approved equal.