Amendment 0004 - NP-BLRI 2B13 2H17 Etc.pdf

(x)

693C7322B000004 x x

1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE

RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN REJECTION OF YOUR

OFFER. If by virtue of this amendment you desire to change an offer already submitted , such change may be made by letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

ASHBURN VA 20147

ATTN: CONSTRUCTION

693C73

SUITE E2-3-300

QUANTUM PARK, 22001 LOUDOUN COUNTY PKWY

EASTERN FEDERAL LANDS HIGHWAY DIVISION

FEDERAL HIGHWAY ADMINISTRATION

ASHBURN VA 20147

ATTN: ACQUISITIONS

693C73

SUITE E2-3-300

QUANTUM PARK, 22001 LOUDOUN COUNTY PKWY

EASTERN FEDERAL LANDS HIGHWAY DIVISION

FEDERAL HIGHWAY ADMINISTRATION

See Block 1401/26/20220004

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended , by one of the following methods: (a) By completing

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

12/16/2021

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

Project NP-BLRI 2B13, 2H17, ETC

The purpose of this Amendment is to:

1) Revise plans sheet.

2) Revise Solicitation J-pages (Special Contract Requirements, SCRs) to make required changes.

3) Provide additional clarification on a previous response to a bidder question.

4) The bid opening date remains February 1, 2022, at 2:00 pm EST.

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

(Signature of person authorized to sign) (Signature of Contracting Officer)

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

Previous edition unusable

Except as provided herein, all terms and conditions of the document referenced in Item 9 A or 10A, as heretofore changed, remains unchanged and in full force and effect .

Amendment 0004

Info Page 1 of 2

U.S. DEPARTMENT OF TRANSPORTATION

FEDERAL HIGHWAY ADMINISTRATION

EASTERN FEDERAL LANDS HIGHWAY DIVISION

Amendment No. 0004

Project NP-BLRI 2B13, 2H17, ETC

Blue Ridge Parkway

Solicitation: 693C73-22-B-000004

The purpose of this Amendment is to:

1) Revise plans sheet.

2) Revise Solicitation J-pages (Special Contract Requirements, SCRs) to make required changes.

3) Provide additional clarification on a previous response to a bidder question.

4) The bid opening date remains February 1, 2022, at 2:00 pm EST.

Plan Sheets Changes

1) Replace plan sheet B01.

Solicitation J Pages Changes

1) Replace entire Section 305 of the SCRS with the new SCR Section 305 with Amendment 4.

Question

This is a follow up question on the referenced project as it relates to your response on January

15th and the Addendum that came out yesterday (January 21st) with new FDR Special Contract

Requirements.

First, let me make a couple of comments:

• Based on the previous response, specifically the last sentence of your response, I had interpreted that to mean that it was up to the contractor to determine a mix design to provide an 8” cement stabilized base and that whether to incorporate the existing asphalt into that was up to us. In other words, if we could meet the strength requirements with the appropriate cement content on the underlying stone base and subgrade materials then the incorporation of asphalt into the mixing process is not a requirement.

• The New FDR Special Provision includes a new section, 305.03 General, a) Sampling, that specifically states, “Collect representative samples of the pavement and base from the project” and this statement is underlined in the new provision. I interpret this to mean that incorporating the existing asphalt into the FDR process is required and not necessarily left up to the contractor in the design process.

• Perhaps I have misinterpreted your first response and you intend it to be a requirement to incorporate the asphalt in FDR.

• Here are the reasons this answer is so important:

Amendment 0004

Info Page 2 of 2 o If asphalt is required to be incorporated into the FDR, then the mixing process will have to be 12” deep instead of 8” o Since the profile elevation is to remain the same and 3.5” of new asphalt placed, then roughly 4” of mixed material will have to be hauled off after mixing. This material will have no recycling value to be used back into the new asphalt mix. There would also be waste on the cement if hauled off after treatment.

Response: See revisions to sheet B01 and SCR section 305 included in Amendment 4.

Section 305

Section 305. — FULL DEPTH RECLAMATION WITH CEMENT

Description

305.01 This work consists of pulverizing an existing pavement and base in-place, adding crushed aggregate if required, mixing this material with cement and water, and shaping and compacting the mix to produce a stabilized base.

Material

305.02 Conform to the following Subsections:

Crushed aggregate 703.06 Hydraulic cement 701.01 Water 725.01(c)

Construction Requirements

305.03 General. Develop mixture design or designs for full depth reclamation with cement based on samples taken from the roadway within the project limits. Evaluate sample properties and develop mixture design or designs based on sample properties.

a) Sampling. Collect representative samples of the pavement and base from the project. Sample at a minimum rate of every half mile for the length of the project. Collect additional samples when a change in site conditions is evident. Alternate lanes for sampling if more than one lane of roadway is undergoing FDR.

b) Evaluation of roadway samples. Perform the following testing on each sample:

1) Gradation. AASHTO T27 and T11

2) Liquid Limit, Plastic Limit, Plasticity Index. AASHTO T89 and AASHTO T90

3) Soil Classification. AASHTO M145

Report results of sample evaluations to CO.

c) Proportioning and Mixture Design Development. Develop mixture designs as necessary to reflect variations in roadway composition and to conform to Table 305-1 requirements. Process and blend samples with the same characteristics as determined according Subsection 305.03 (b) to achieve a gradation representative of the in-place composition of the pulverized material.

Estimate the median cement content by weight of mix to meet the requirements shown in Table 305-1 for each mixture design. At this median cement content and at cement contents 1 percent above and below this median unless otherwise directed by the CO, determine the optimum moisture content, maximum density, and the parameters shown in Table 305-1.

Table 305-1 Soil-Aggregate-Cement Mix Design Parameters

Material or Property Requirement

Unconfined compressive strength, ASTM D1633, Method A (1)

Average Strength range (3 specimens)

200-400 psi

Maximum strength of a single specimen break

500 psi or less

Loss in mass, AASHTO T 135 & AASHTO T 136, 12 cycles

14% max.

(1) At 7-day cure at 70 °F according to ASTM D1632.

Submit a mix design or mixture designs for approval a minimum of 14 days before production which includes the following:

(1) Optimum cement content conforming to the requirements shown in Table 305-1;

(2) Maximum density and moisture content at the optimum cement content according to AASHTO T 134, minimum of 5 points;

(3) Source of each component material including certifications;

(4) Results of all tests and applicable charts and graphs;

(5) Gradation and proportion of imported crushed aggregate, if used;

(6) Proportion of base material to pavement and gradation of the mix;

(7) 200-pound sample of the pavement, base, and imported crushed aggregate, if requested; and

(8) 20-pound sample of Portland cement, if requested.

(9) Project stationing start and stop for each mixture design submitted.

Start production only after the mix design or mix designs are approved. Submit a new mix design if the CO requests due to a change in material.

305.04 General. See Subsection 304.03.

305.05 Production Start-Up Procedures.

(a) Preparatory phase meeting. Conduct a pre-stabilization preparatory phase meeting at least 7 days before the start of stabilizing operations according to Subsection 153.04(a).

(b) Control strip. Provide 7 days notice before starting production.

On the first day of production, stabilize a 1200-foot control strip, one-lane wide, at the designated lift thickness and mix design proportions. Construct the control strip on the project at an approved location.

Construct the control strip using construction procedures intended for the entire project. Sample and test according to Table 305-3 . Take nuclear gauge density readings behind each roller pass to determine the roller pattern necessary to achieve the specification requirements in Subsection 305.10.

Cease production after construction of the control strip until the stabilized base layer and the control strip are evaluated for acceptance. Test strip is accepted if required density as measured per Subsection

305.10 meets minimum requiremnt, and 7 day compressive strength meets the requirements of Table 305-2.

Table 305-2

Soil-Aggregate-Cement Test Strip Requirements

Material or Property Requirement

Unconfined compressive strength, ASTM D1633, Method A (1)

Average Strength range (3 specimens)

200-400 psi

Minimum strength of a single specimen break

100 psi or more

Maximum strength of a single specimen break

600 psi or less

(1)Fabricated according to ASTM D1632 . 7-day cure at 70 °F according to ASTM D1632.

Repeat the control strip process until an acceptable control strip is produced. See Subsection 106.01 for the disposition of material in unacceptable control strips. Accepted control strips may remain in place and will be accepted and measured as a part of the completed base. When a control strip is accepted, full production may start.

Use these start-up procedures when changing construction procedures, when resuming production after a termination of production due to unsatisfactory quality according to Subsection 106.04, or the starting of a new construction season.

305.06 Adding Crushed Aggregate. See Subsection 304.04.

305.07 Pulverizing. See Subsection 304.05.

305.08 Applying Cement.Do not add cement when the underlying surface is frozen, muddy, or when conditions allow for excessive loss to eroding or blowing. Start cement application when the air temperature is above 40 °F and is expected to stay above 40 °F for 48 hours. Apply cement by one of the following methods:

(a) Dry method. Use a metered mechanical spreader to uniformly apply the cement. Use canvas (or similar) skirts around the spreader box to minimize dust.

(b) Slurry method. Use approved equipment and dispersal processes to uniformly apply a cement and water slurry without pooling or run off. Equip slurry tanks with an agitator to keep the cement suspended in water. Apply the slurry to the pulverized material with 60 minutes from time water first contacts the cement. Make successive passes over the material if necessary to obtain the proper moisture and cement content for mixing and compacting.

305.09 Mixing.Start mixing within 30 minutes after cement application. Use a road reclaimer conforming to Subsection 304.05. Add water as necessary to adjust the moisture content of the mixture to within 2 percent of optimum as indicated in the approved mix design. Continue mixing until the cement is uniformly distributed within the in situ material creating a homogeneous full depth layer.

Complete mixing within 1 hour of the cement application.

305.10 Compacting and Finishing. Compact the processed material uniformly to at least 95 percent of maximum density as determined from AASHTO T 134. Provide rollers sized and configured to achieve the required compaction and finishing. Operate rollers according to the manufacturer’s recommendations. Compact the processed material full width by rolling from the sides to the center, parallel to the centerline of the road. Along curbs, headers, walls, and places not accessible to the roller, compact the material with approved tampers or compactors.

During compaction and final grading maintain the moisture content of the mixture to within 2 percent of optimum. Do not leave areas of stabilized material uncompacted or undisturbed for more than 30 minutes.

Complete compaction within 1 hour after mixing.

Finish the compacted surface according to Subsection 301.06 to produce a surface that is smooth, dense, and free of compaction planes, ridges, or loose material. Clean the compacted surface of loose material, dirt, or other deleterious material by approved methods. Complete finishing operations within 4 hours from the start of mixing including corrections to irregularities in the surface.

305.11 Construction Joints. When cement application operations are delayed or stopped for more than 2 hours, make a transverse construction joint by cutting back into the completed work to form an approximately vertical face. Tie new work into the completed work by remixing approximately 36 inches of the completed course.

305.12 Micro-cracking. Micro-crack the finished compacted surface 48 to 72 hours after completion of compaction using a 10 to 12 ton vibratory steel drum roller, set at maximum amplitude, advancing at approximately 2 miles per hour, and make three full passes, or as directed by the CO.

305.13 Curing. Allow material to cure a minimum of 24 hours before placing the next course. Cure by one of the methods below:

(a) Water method. Keep the surface continuously moist by applying water through a spray bar equipped with nozzles producing a fine, uniform spray. During the first 24 hours of curing, use a water truck with side spray to avoid driving on the newly stabilized layer. Apply water in a manner that prevents damage to the finished surface. Maintain a moist surface for at least 7 days or until next course if placed, whichever is less.

(b) Prime coat method. Seal the surface by placing an inverted prime coat according to Subsection 411.06(b). Provide and maintain a continuous film over the surface. Apply prime coat within 24 hours after compacting and finishing. Keep surface moist according to 305.13(a) until prime coat is placed.

If approved, allow local automobile traffic on the cement stabilized layer 4 hours after finishing operations are complete. Limit traffic speeds to 20 miles per hour. Stop traffic if there is surface marring or deformation. Do not allow truck traffic (other than equipment necessary to complete the next course) on the cement stabilized layer until the next course is placed.

305.14 Maintenance. Maintain the cement stabilized layer to the correct line, grade, and cross-section until placement of the next course. If the cement stabilized layer loses stability, density, or finish before placement of the next course, reprocess, recompact, and add cement as necessary to restore the strength of the damaged material.

Overlay the stabilized base within 14 days after compacting.

305.15 Acceptance. See Table 305-3 for sampling, testing, and acceptance requirements.

Crushed aggregate will be evaluated under Subsection 106.03.

Cement will be evaluated under Subsections 106.02 and 106.03.

7 Day unbound compressive strength testing according to ASTM D1633 will be evaluated under Subsection 106.02 and 106.04

Construction of full depth reclamation with cement will be evaluated under Subsections 106.02 and 106.04.

Prime coat will be evaluated under Subsection 411.09.

Measurement

305.16 Measure the Section 305 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable:

Payment

305.17 The accepted quantities will be paid at the contract price per unit of measurement for the Section 305 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05.

Table 305-3 Sampling, Testing, and Acceptance Requirements

Material or Product

(Subsection)

Type of Acceptance (Subsection)

Characteristic Category Test Methods Specifications

Sampling Frequency

Point of Sampling

Split Sample

Reporting Time

Remarks

Roadway Samples Roadway Samples

Measured and tested for conformance (106.04)

Gradation

Liquid Limit

Plastic Limit

Soil Classification

AASHTO T27

and T11

AASHTO T89

AASHTO T90

AASHTO

M145

1 per Sample

Existing Roadway

When Requested

Minimum 45 days before production

Mix Design Full depth reclamation (FDR) with cement mixture

Measured and tested for conformance (106.04)

All – Subsection 305.03

1 per submitted mix design

Existing roadway

Yes Minimum 30 days before production

Table 305-3 (continued) Sampling, Testing, and Acceptance Requirements

Material or Product

(Subsection)

Type of Acceptance (Subsection)

Characteristic Category Test Methods Specifications

Sampling Frequency

Point of Sampling

Split Sample

Reporting Time

Remarks

Production Start-up (control strip)

FDR

Before Adding Cement

FDR with cement material

Measured and tested for conformance

− AASHTO

T 27,T11

AASHTO T27

Minimum

Behind reclaimer before mixing reclaimer before compaction

No

24 hours

Upon Completion of test

Minus 1-½ -inch sieve requirement only

Moisture-density (max density)

– AASHTO

T 134 minimum

" Yes " Minimum 5 points per proctor

Moisture content

(in-place)

– AASHTO

T 255 minimum

In-place after compaction

No " −

Density

Unconfined compression strength (7-day)

T 310 or other

Approved methods

Table 305-2

Subsection 305.05(b)

One set per 400 ft(1) before compaction

7 days

7-day cure

Sampling, Testing, and Acceptance Requirements

Material or Product

(Subsection)

Type of Acceptance (Subsection)

Characteristic Category Test Methods Specifications

Sampling Frequency

Point of Sampling

Split Sample

Reporting Time

Remarks

Production

FDR

Before Adding Cement

Measured and tested for conformance

Liquid Limit

Plastic Limit

Soil Classification

T 27, T11

AASHTO T89

AASHTO T90

AASHTO M145

Minimum

3500 yd2

Reclaimer before mixing cement

24 Hours

FDR with material

Measured and tested for conformance (106.04)

Moisture-density

(maximum density)

– AASHTO

T 134

1 per change of material

Behind reclaimer before compaction

Yes Before using in work

Minimum 5 points per proctor

Density – AASHTO T 310 or other approved procedures

2,000 yd2

In-place after compaction

No End of shift

Process control

(153.03)

Gradation – AASHTO T 27

Minimum

3500 yd2 before compaction

" Upon completion of test

Monitor percent passing the 1-½ -inch and No. 4 sieves

Moisture content

(in-place)

– AASHTO

T 255 or other approved methods

" In-place after compaction

Unconfined compression strength (7-day)

Table 305-2

Minimum 1 set per Day(1)

Behind reclaimer before compaction

" 7 days

7-day cure

Sampling, Testing, and Acceptance Requirements Material or

Product (Subsection)

Type of Acceptance (Subsection)

Characteristic Category Test Methods Specifications

Sampling Frequency

Point of Sampling

Split Sample

Reporting Time

Remarks

Finished Product FDR with cement material

Measured and tested for conformance (106.04)

Surface tolerance & grade

– Subsection 301.06

Determined by the CO

Completed FDR surface

No Before placement of next layer or as requested

(1) One set of unconfined compressive specimens consists of 3 samples fabricated according to ASTM D1632 and tested according to ASTM

D1633