Attacment 1 Additional Specs.pdf

203 – REMOVAL OF STRUCTURES AND OBSTRUCTIONS

Description

203.01 Replace this section with the following:

This work consists of removing and scattering the logs from the log stringer bridges and log crib abutments, and removing and disposing of the sawn timber in the decks and guardrail at Silver

Creek and Willame Creek.

Construction requirements

203.04 Removing Material

Replace this section with the following:

Remove and dispose of the native log stringer bridges and log bridge crib abutments, at Silver

Creek and Willame Creek by scattering the logs in the local forest area as directed by the

Contracting Officer.

Construct structurally adequate debris shields to contain debris within the construction limits.

Do not permit debris to enter waterways or areas designated not to be disturbed.

203.05 Disposing of Material.

Delete the following sections:

(b) Burn and

(c) Bury

208 - Structure Excavation and Backfill for Selected Major Structures

Construction Requirements

208.04 General.

Add the following to the end of the second sentence of the third paragraph:

"... to the CO a minimum of 5 days prior to beginning excavation work."

Add the following to the end of the third sentence of the third paragraph:

"...to the CO a minimum of 15 days prior to installation."

208.09 Foundation Preparation.

Add the following after the first paragraph:

The foundation elevation is defined as the bottom of footings, for spread footing placement; the bottom of the pile cap, for construction of pile foundations; and the toe of the wall, for construction of retaining walls, except wingwalls at bridges.

Replace all material from any over-excavation below the designated footing elevation with concrete, compacted gravel, or foundation fill at the direction of the CO.

When boulders or irregular, fractured, or seamed bedrock precludes excavation to the designated footing elevation without further loosening of previously solid material, the CO may order removal of such loose material and allow payment for concrete, gravel, or structural backfill that is required to restore foundation material to the designated elevation

208.13 Measurement.

Add the following to the second paragraph:

(f) Material excavated to construct end walls or wing walls which lie outside the excavation limits specified above.

Add the following paragraph:

Foundation over-excavation and the resulting replacement material will not be measured for payment unless the CO determines the over-excavation was unavoidable because of the nature of the material.

251 - Riprap

251.03_nat_us_06_18_2007

251.03 General.

Add the following:

Place riprap under or adjacent to structures before placing prefabricated superstructure units or constructing superstructure falsework unless otherwise approved by the CO.

251.08 Measurement.

Payment for excavation and embankment required for placement of riprap is indirectly included in the pay item for riprap.

262 – Grouted Rebar Columns

262.01 This work consists of all necessary equipment, labor and materials needed to drill and install grouted rebar columns as shown on the drawings and in accordance with these specifications. Drill and install grouted rebar columns using 3 inch minimum diameter casing to construct the grouted rebar columns as Type B micropiles with low pressure grouting. Install and grout in general accordance with Publication no. FHWA NHI-05-039 Micropile Design and

Construction Reference Manual.

Material

256.02 Conform to the following Subsection:

Reinforcing Steel 709.01

Grout 722.02(e)

262.03 Equipment Requirements.

(a) Grouting Equipment. Use a high speed high shear (colloidal type) mixer with two separate holding tanks and water dosing tanks capable of providing a continuous mixing and pumping operation (one for flushing grout and one for final grout) with the holding tanks to have a variable speed high-efficiency paddle mixer that maintains a thoroughly mixed grout while waiting to be pumped. Ensure tanks or mixers have sufficient capacity to allow continuous, uninterrupted flushing or grouting during drilling. Connect the grout pump directly to the agitated storage tank to provide a continuous pumping operation.

Provide a piston or plunger pump with a minimum flow rate of approximately 4.3 cubic feet per minute (32 gallons per minute) and pressure capability of 300 pounds per square inch (psi).

Provide a secondary pressure capability of a minimum of 1,000 psi to clean out grout or dirt blockages in hoses or hollow-core bars.

(b) Drilling Equipment. Provide drilling equipment capable of drilling gravel to boulder sized material and advance casing to required depths for grouted rebar columns.

262.04 Installation Requirements.

(a) Grouting. Provide a neat cement grout with a water/cement (w/c) ratio of 0.4 to 0.5.

Additives are not allowed without approval by the Contracting Officer.

Batch grout at the specified W/C ratio into the mixer using a calibrated tank or flow meter.

Always place water before cement into mixer. Mix grout for a minimum of two minutes or as directed by the cement supplier. Thereafter, continuously agitate grout in the storage tank. Do not add additional water unless authorized by the Contracting Officer. Inject grout within 45 minutes after the water is initially added to the cement. When the ambient temperature is 90 degrees Fahrenheit, or higher, inject grout within 15 minutes after mixing.

Do not allow grout to exceed a temperature of 90 degrees Fahrenheit. Add shaved ice to the water before mixing cement to control the grout temperature. To prevent flash-setting of the grout, cover mixing tanks with wetted cloths and spray grout hoses and anchor bars with water.

Mix sufficient flushing grout and pump into storage tanks.

(b) Grouted Rebar Column Installation. Advance casing to micropile depth using water as the drilling medium; bentonite or other hole stabilization additives are not allowed. Flush holes clean of excess cuttings. Install rebar with centralizers located a maximum of 3 feet from the top and bottom of the bars and at intervening spacing not exceeding 10 feet. Reinforcing steel couplers may be used provided they develop the full strength of the reinforcing steel as specified by the supplier.

Tremie grout from bottom up, to fill the casing. Extract casing incrementally with pressure added to the grout column not to exceed 150 psi. Place grout in one continuous operation such that grout flushes continuously out of the hole. Take necessary precautions to provide grout that is free of lumps and air pockets.

262.05 Acceptance. Material for grouted columns will be evaluated under Subsections 106.02 and 106.03. Construction of grouted columns and services will be evaluated under Subsections

106.02 and 106.04. Grouting will be evaluated under Subsections 106.02 and 106.04.

Measurement

262.06 Measure the Section 262 item listed in the bid schedule according to Subsection 109.02.

Payment

262.07 The accepted quantities will be paid at the contract price per unit of measurement for the

Section 262 pay item listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

308 - Minor Crushed Aggregate

Delete section 308 in its entirety and replace with the following:

308.01 This work consists of placing Government furnished aggregate or furnishing and placing crushed aggregate for bedding, backfill and roadway aggregate course.

308.02 Conform to the following Subsections:

Crushed aggregate 703.06

Water 725.01

308.03 Preparing Surface. Prepare the roadway surface on which aggregate course is placed as shown on the plans.

308.04 Placing Crushed Aggregate.

(a) Roadway aggregate. Mix the aggregate and adjust the moisture content to obtain a uniform mixture with a moisture content suitable for compaction. Spread and shape the mixture on the prepared surface in a uniform layer.

Do not place the mixture in a layer exceeding 6 inches in compacted thickness. When more than one layer is necessary, compact each layer according to Subsection 308.05(a) before placing the next layer.

(b) Bedding and backfill aggregate. Place and shape the mixture in layers that, when compacted, do not exceed 6 inches in depth.

308.05 Compacting and Finishing Crushed Aggregate.

(a) Roadway aggregate. Compact as follows

Compact the aggregate by operating compaction equipment over the total width until visible deformation ceases. A minimum of three complete roller passes shall be made at a moisture content suitable for compaction.

(b) Bedding and backfill aggregate. Compact in 6 inch lifts by using a Forest Service approved mechanical compactor until no visible deformation is observed over the entire area of aggregate.

308.06 Acceptance. Crushed aggregate will be evaluated under Subsections 106.02 and 106.03.

Furnish a production certification including gradation and quality properties for each source.

Construction of roadway aggregate courses will be evaluated under Subsections 106.02 and

106.04. Method 2 compaction will be evaluated under Section 106.04.

Placement of bedding and backfill aggregate will be evaluated under Subsection 106.02 and

Section 209.

Preparation of the surfaces on which crushed aggregate is placed will be evaluated under Section

303 and 209 as applicable.

308.07 Measure the Section 308 items listed in the bid schedule according to Subsection 109.02 and the following as applicable.

Measure crushed aggregate by the cubic yard in-place on the road.

Measure width horizontally to include the top of aggregate width including designed widenings.

Measure the length horizontally along the centerline of the roadway.

308.08 The accepted quantities will be paid at the contract price per unit of measurement for the

Section 308 pay item listed in the bid schedule. Payment will be full compensation for the work

552 - Structural Concrete

552.01 Replace the first paragraph with the following:

This work consists of furnishing, placing, finishing, and curing precast concrete for caps, backwalls and wingwalls,including all steel reinforcing, shapes, plates and inserts. The work also includes transporting and placing the precast concrete members at the bridge sites, as shown on the drawings and as specified in this contract. Installation includes any necessary grouting, welding, or other necessary connections.

552.02 Add the following:

Anchor bolts 717.01

Elasomeric Bearing Pads 171.10

Dowels 717.17

Epoxy resin adhesives 725.21

High strength non-shrink grout 701.02

Mortar 701.02

Portland cement 701.01

Reinforcing Steel 554

Reinforcing Steel & Wire Rope 709.01

Sealants, fillers, seal, and sleeves 712.01

Storing, Transporting, & Erecting 553.08

Steel Structures 555

Structural Steel 707.01

Provide precast concrete members of the size, shape, strength, air content, and finish that are shown on the plans. Fabricate precast concrete members in a plant certified by the

Precast/Prestressed Concrete Institute (PCI). Submit a copy of the transmittal letter of the latest

PCI inspection with the shop drawings.

Perform all sampling, testing, and inspection necessary to ensure quality control of the component materials and the concrete. Sample and test for quality control and acceptance testing in accordance with the AASHTO or ASTM test methods prescribed in Section 552.

Maintain adequate records of all inspections and tests. Keep records that indicate the nature and number of observations made, the number and type of deficiencies found, the quantities approved and rejected, and the nature of any corrective action taken.

Sample and test every batch (100 percent sampling and testing) for air content and slump at the start of concrete production. Random sampling and testing for air content and slump at the rate of one for every five successive batches may be substituted for 100 percent sampling and testing if the test results for three successive batches are within the specification limitations for air content or slump; but reinstate 100 percent sampling and testing if a test result for any random sample is outside the specification limitations for either air content or slump.

Make compression tests to determine the minimum strength requirements on cylinders. Make a minimum of four cylinders from each day’s production, and cure them in the same manner as the precast units. Use testing methods in accordance with AASHTO T 22.

Furnish, or have the supplier furnish, a Certificate of Compliance to the CO Certifying that the above materials comply with the applicable specifications. In addition, furnish to the CO a copy of all test results performed by the Contractor or supplier that are necessary to ensure compliance.

552.03 Composition (Concrete Mix Design).

Delete Tables 552-1, 2, and 3 and replace with the following:

Table 552-1

Composition of Concrete

Class of

Concrete

Minimum

Cement

Content

(pound per cubic yard)

Maximum

W/C

Ratio

Slump (1)

(inches)

Maximum

Nominal Coarse

Aggregate

Size (5)

(inches)

A 611 0.49 2 to 4 1½

A(AE) 611 0.44 1 to 4 1½

B 517 0.58 2 to 4 2½

B(AE) 517 0.58 2 to 4 2½

C 658 0.49 2 to 4 ¾

C(AE) 658 0.44 1 to 3 ¾

D(AE)

(2)

611 0.40 1 to 3 1½

E(AE)

(3)

611 0.40 4 to 6 (4)

¾

P

(Prestressed) 658 0.44 0 to 4 1

P(AE) 658 0.44 0 to 4 1

Seal 658 0.54 4 to 8 1½

HPC4000

(7)

615 0.40 2 to 4 ¾ (1)

Maximum slump is 8 inches if approved mix design includes a high-range water reducer.

(2) Concrete with a water reducing and retarding admixture conforming to AASHTO

M 194, type D.

(3) A latex modified concrete with 0.037 gallons of modifier per pound of cement.

(4) Measure the slump 4 to 5 minutes after the concrete is discharged from the mixer.

(5) Meeting the processing requirements of AASHTO M43, Table 1 – Standard

Sizes of Processed Aggregate.

(6)

Use Class P (AE) concrete in the entire depth of the top flange of all multi-beam bridge girders. In lieu of this, Class P (AE) concrete may be used for fabrication of the entire girder, and throughout the entire depth of prestressed slabs. In all cases, furnish concrete meeting the 28 day specified minimum concrete strength requirements for the prestressed members as shown on the plans, unless otherwise specified.

(7)

Include High-Range Water-Reducing Admixture (super plasticizer) conforming to AASHTO M 194 and silica fume.

Table 552-2

Minimum Air Content for Air Entrained Concrete

Nominal Maximum

Aggregate Size (1)

As Delivered

Minimum Air

Content

(2) (3)

2½ inch 3.5

2 inch 3.5

1½ inch 4.0

1 inch 4.5

¾ inch 4.5

½ inch 5.5 (1)

Meeting the processing requirements of AASHTO

M 43, Table 1 – Standard Sizes of Processed

Aggregate.

(2)

These air contents apply to the total mix. When testing these concretes, aggregates larger than 1½ inches are removed by handpicking or sieving, and air content is determined on the minus 1½-inch fraction of the mix. Air content of the total mix is computed from the value determined on the minus 1½-inch fraction.

(3)

For P(AE) concrete, the as delivered minimum air contents may be reduced 1.0 % and the maximum air content is 6.0 %

Table 552-3

Required Average Compressive Strength (1)

Specified Compressive

Strength (f’c)

(psi)

Required Average

Compressive Strength

(f’cr)

(psi)

Less than 3000 f’c + 1000

3000 to 5000 f’c + 1200

Over 5000 1.10f’c + 700

(1) Use this table when there is not enough data available to establish a standard deviation

Delete the first paragraph after Table 552-2 and replace with the following:

Submit written concrete mix designs for approval at least 30 calendar days before production.

Add the following under the list of items to be included in the mix design submittal:

(y) Evaluation of potential aggregate reactivity

552.04 Storage and Handling of Materials.

Replace this section with the following:

552.04 Precast Concrete Members.

Performance. Construct precast concrete structural members in accordance with the following sections and subsections, as applicable:

Submit four sets of shop drawings to the CO for approval, including the concrete mix design for each class of concrete proposed for use, a minimum of 21 days before fabrication of the precast member(s).

Casting Yard. Cast precast concrete structural members in a PCI certified plant.

Handling, Transporting, & Erecting. Provide additional reinforcement, as needed, to meet the requirements of handling, transporting, and erecting precast members.

552.08 Delivery.

(a) Truck mixer/agitator.

Do not exceed 130 total revolutions at mixing speed, including both initial mixing and remixing. Do not exceed 300 total revolutions, including both mixing and agitating speed.

552.09 Quality Control of Mix.

Add the following after the first paragraph:

At least 2 weeks prior to the start of concrete placement operations, arrange a pre-concrete placement conference. Coordinate attendance with the CO and any applicable subcontractors.

Be prepared to discuss and/or submit the following:

(1) Proposed concrete placement schedule.

(2) Review approved concrete mix design and determination of batch weights.

(3) Discuss Section 153, Contractor Quality Control, minimum frequency schedule for process control sampling and testing (to be performed by the Contractor).

(4) Discuss batching, mixing, placing, and curing requirements.

(5) Discuss Subsections 106.03, Certification, and 106.05, Statistical Evaluation of

Material for Acceptance.

552.11 Handling and Placing Concrete.

Add the following after the forth paragraph:

Use an approved form release agent to produce a minimum of staining, air holes, and hydration discoloration.

552.20 Measurement.

Replace the second paragraph with the following:

Do not measure reinforcing steel, concrete, anchorages, plates, nuts, and other material contained within or attached to the unit for precast concrete structural members.

552.21 Payment.

Replace the second paragraph with the following:

Do not measure reinforcing steel, concrete, anchorages, plates, nuts, and other material contained within or attached to the unit for precast concrete structural members.

554 - Reinforcing Steel

554.03_nat_us_06_20_2007

554.03 Order Lists.

Delete the first paragraph and replace with the following:

Do not submit order lists or bending diagrams for approval.

554.08 Placing & Fastening.

Delete the first sentence and replace with the following:

Place, fasten, and support the bars according to the CRSI Manual of Standard Practice. Use precast concrete blocks or metal supports, but only use precast mortar blocks in areas permanently hidden from view in the completed structure.

556 - Bridge Railing

556.01

Delete the first paragraph and replace with the following:

This work consists of furnishing and erecting the steel type IV, class B thrie beam railing, including attachment hardware. The bridge rail posts and all miscellaneous rail items are government furnished.

Prior to acceptance of the completed structure, clean the bridge and approach rail of all foreign matter, including dirt, cement paste and petroleum products, leaving these surfaces in the same condition as when they left the fabricator. Use hand tool, solvent and blast cleaning as required but use power tool cleaning only as approved.

Material.

556.02

Galvanized coating repair 717.07

Structural steel tubing 717.01(h)

556.05 Steel Railing.

Add the following at the beginning of the first sentence.

"Except as provided for in the supplemental specifications or shown on the plans, ... "

571 – Prefabricated Steel Bridge

571.01 This work consists of erecting a simple-span welded weathering steel bridges, with glued laminated timber decks, treated timber running planks and weathering steel bridge rail post assemblies, as shown on the plans, superstructure shop drawings and in accordance with the specifications. The bridge components (with all connecting hardware, except ring shank nails to attach the running planks) are stockpiled at the Packwood Work Center Compound in Packwood, Washington. The Contractor must supply the running plank nails as called for on the plans and shop drawings.

571.02 Abutments. Construct required caps, bearing, and abutments as shown on the drawings and according to these specifications. Back wall and wing wall heights may need to be modified slightly to match the government furnished bridge superstructure height. This information will be given to the Contractor at the pre-work meeting.

General

571.03 Installation. The Contractor is responsible for inspecting the stockpiled material at the storage site, to ensure parts are not damaged, incomplete or missing. The Contractor is responsible for any damage to materials that results from transportation and installation. A ten percent overage of all bolts, washers, nuts and nails are included in the stockpiled materials.

571.04 Measure the Section 571 items listed in the bid schedule according to Subsection

109.02(h).

571.05 The accepted quantities will be paid at the contract price per unit of measurement for the

Section 571 items listed in the bid schedule. Payment will be full compensation for the work

617 - Guardrail

617.02_nat_us_07_03_2007

617.02

Galvanized coating repair 717.07

617.03 Posts.

Replace the first paragraph with the following:

Fabricate all timber components of guardrail as detailed in Subsection 557.04. Pressure treat all timber as detailed in Subsection 716.03, using creosote, pentachlorophenol (any solvent), ammoniacal copper zinc arsenate (ACZA), or chromated copper arsenate (CCA – Type A, B, or

C) in conformance with AASHTO M 133. Provide grading certification and pressure treatment test results, and meet the Best Management Practices (BMP’s) requirements of Subsection

716.03. Field treat cuts or abrasions made in fabricated timber after treatment in accordance with Subsection 557.04.

617.04 Rail Elements.

(a) Steel rail.

Replace the third paragraph with the following:

Repair all scrapes, cuts and other damaged coating areas on galvanized surfaces that are through to the base metal with galvanized coating repair.

617.05 Terminal Sections.

Add the following to the end of the second sentence:

"... unless otherwise shown on the plans."

703 - Aggregate

703.05_nat_us_12_07_2006

Delete 703.05 and replace with the following:

703.05 Subbase, Base, Surface Course, and Screened Aggregate.

(a) Subbase or base aggregate. Furnish hard, durable particles or fragments of crushed stone, crushed slag, or crushed gravel conforming the following:

(1) Gradation Table 703-2

(2) Liquid limit, AASHTO T 89 25 max.

(3) Plastic limit, AASHTO T 90 Nonplastic

(4) Los Angeles abrasion, AASHTO T 96 40% max.

(5) Sodium sulfate soundness loss (5 cycles), 12% max.

AASHTO T 104

(6) Durability index (coarse), AASHTO T 210 35 min.

(7) Durability index (fine), AASHTO T 210 35 min.

(8) Fractured faces, ASTM D 5821 50% min.

(9) Free from organic matter and lumps or balls of clay

Do not use material that breaks up when alternately frozen and thawed or wetted and dried.

Obtain the aggregate gradation by crushing, screening, and blending processes as necessary.

Fine aggregate, material passing the No. 4 sieve, shall consist of natural or crushed sand and fine mineral particles.

(b) Surface course aggregate. Furnish hard, durable particles or fragments of crushed stone, crushed slag, or crushed gravel conforming the following:

(1) Gradation Table 703-3

(2) Liquid limit, AASHTO T 89 35 max.

(3) Plastic Index, AASHTO T 90

a) If the percent passing the No. 200 sieve is less than 12% 2 to 9

b) If the percent passing the No. 200 sieve is greater than 12% Less than 2

(4) Los Angeles abrasion, AASHTO T 96 40% max.

(5) Sodium sulfate soundness loss (5 cycles), 12% max.

AASHTO T 104

(6) Durability index (coarse), AASHTO T 210 35 min.

(7) Durability index (fine), AASHTO T 210 35 min.

(8) Fractured faces, ASTM D 5821 75% min.

(9) Free from organic matter and lumps or balls of clay

Do not furnish material that contains asbestos fibers.

Fine aggregate, material passing the No. 4 sieve, shall consist of natural or crushed sand and fine mineral particles.

(c) Screened aggregate – Furnish hard, durable particles or fragments of stone, slag, or gravel conforming the following:

(1) Gradation Table 703-16

(2) Plastic Index, AASHTO T 90 Less than 9

(3) Los Angeles abrasion, AASHTO T 96 55% max.

(4) Free from organic matter and lumps or balls of clay.

Delete Table 703-2 and replace with the following:

T a b le

-2 rg et

V a lu e

R a n g es f o r

S u b b a se a n d B a se

G ra d a ti o n

P er ce n t b y M a ss

P a ss in g D es ig n a te d

S ie v e

(A A

S H

T O

T a n d

T

G ra d in g D es ig n a ti

E

B a se

.0

.0

T h e v al u e in t h e p ar en th es es i s th e al lo w ab le d ev ia ti o n fr o m t h e ta rg et v al u es

D

B a

.0

.0

C

B a

.0

.0

B

S u b b a

.0

.0

A

S u b b a se

.0

.0

S ie v e

S iz e

½ i ch i

½ i

/4 i

/2 i

/8 i

N

Delete Table 703-3 and replace with the following:

b le

-3 rg et

V a lu e

R a n g es f o r

S u rf a ce G ra d a ti

P er ce n t b y M a ss

P a ss in g D es ig n a te d

S ie v e

(A A

S H

T O

T a n d

T

G ra d in g D es ig n a ti

U

.0

.0

T h e v al u e in t h e p ar en th es es i s th e al lo w ab le d ev ia ti o n fr o m t h e ta rg et v al u es

I f th e p la st ic it y i n d ex

P I) i s g re at er t h an th e T

V r an g e fo r th e

N o s ie v e si ze i s

-1

.0

.0

S

.0

.0

H

.0

.0

G

.0

.0

F

-1

-8

-6

-5

-3

-2

.0 -1

.0

S ie v e

S iz e

/2 i

/4 i

/2 i

/8 i

Add Table 703-16:

Table 703-16

Gradation Requirements for Screened Aggregate

Sieve Size

Percent by Mass Passing Designated Sieve (AASHTO T 27 and T 11)

Grading Designation

L M N O P Q R

6 inch 100 100

4 inch 100 100

3 inch 100 100

2 inch 100

No. 4 15-45 15-45 15-45

Add the following subsection:

703.09 Pea Gravel. Furnish hard, durable particles or fragments of natural screened pebbles and gravel in conformance with the size and gradation requirements of AASHTO M43, Table 1, size number 8. Furnish material free of organic matter, lumps or balls of clay, and other deleterious matter.

703.06_nat_us_03_02_2005

703.10(e) Flakiness Index.

Delete and replace with the following:

Flakiness Index, FLH T 508 30% max.

703.10(i) Adherent Coating.

Adherent coating on the aggregate, FLH T 512 0.5% max.

709 - Reinforcing Steel and Wire Rope

709.01_nat_us_07_03_2007

709.01 Reinforcing Steel.

(b) Reinforcing bars.

Delete paragraph one and replace with the following:

Furnish deformed, grade 60 bars conforming to AASHTO M 31 or ASTM 706.

(d) Tie bars.

Delete paragraph one and replace with the following:

Furnish deformed, grade 60 bars conforming to AASHTO M 31 or ASTM 706.

(e) Hook bolts.

Delete paragraph one and replace with the following:

Furnish plain, grade 60 bars conforming to AASHTO M 31 or ASTM 706 with M14 rolled threads or M16 cut threads. Furnish a threaded sleeve nut capable of sustaining a minimum axial load of 15,000 pounds.