Am-0006_W9128F-19-R-0005.pdf

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 items 8 and 15, and returning or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT 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.

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

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT 1. CONTRACT ID CODE

2. AMENDMENT/MODIFICATION NUMBER 3. EFFECTIVE DATE 4. REQUISITION/PURCHASE REQUISITION NUMBER 5. PROJECT NUMBER (If applicable)

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

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

FACILITY CODE

9A. AMENDMENT OF SOLICITATION NUMBER

9B. DATED (SEE ITEM 11)

10A. MODIFICATION OF CONTRACT/ORDER NUMBER

10B. DATED (SEE ITEM 13)

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers is extended. is not extended.

12. ACCOUNTING AND APPROPRIATION DATA (If required) copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NUMBER AS DESCRIBED IN ITEM 14.

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

NUMBER IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

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

15C. DATE SIGNED

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

16C. DATE SIGNED

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

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

PAGE OF PAGES

6. ISSUED BY CODE

8. NAME AND ADDRESS OF CONTRACTOR (Number, street, county, State and ZIP Code) (X)

CODE

15B. CONTRACTOR/OFFEROR

(Signature of person authorized to sign)

16B. UNITED STATES OF AMERICA

(Signature of Contracting Officer)

Previous edition unusable

Amendment No. 0006 W9128F

SOF MOUNTAINEERING FACILITY, PN 81899 (FY19), FORT CARSON, COLORADO

See attached documentation for content of the amendment revisions to solicitation

Date for receipt of proposals is 22 FEB 2019 at 1000 hours

Government Point of Contact: Bill Rawe, Contract Specialist (402) 996-3722

U.S.ARMY CORPS OF ENGINEERS, OMAHA

Rocky Mountain Area Office Attn: CONTRACTING DIVISION (CENWO-CT-M) 5475 Tech Center Drive, Suite 205 Colorado Springs, CO 80919

See Item 6

W9128F-19-R-0005

02/15/2019

01/10/2019

02/15/2019

Am #0006 - 1

Am #0006 - 2 (Continuation SF 30)

15 February 2019 Solicitation No. W9128F 19 R 0005

Date of Issue: 10 JAN 2019 Date of Receiving Proposals: 22 FEB 2019

SUBJECT: Amendment No. 0006 to Request for Proposal Solicitation Package for Design and Construction of SOF MOUNTAINEERING FACILITY.

TO: Prospective Offerors and Others Concerned

1. The specifications and drawings for subject project are hereby modified as follows (revise all specification indices, attachment lists, and drawing indices accordingly).

a. Specifications. (Descriptive Changes.)

(1) Section 01 83 00 Page 8, paragraph 1.3.6, in the first sentence “Interior partitions shall...to the partition.” delete “16 psf” and substitute “10 psf”.

b. Specifications (New and/or Revised and Reissued). Delete and substitute or add specification pages or sections as noted below. The substituted pages or sections are revised and reissued with this amendment. For convenience, on the revised specification pages, changes have been identified with highlighting, all portions of the revised specification pages apply regardless of whether changes are shown with highlighting.

Pages or Sections Deleted Pages or Sections Substituted or Added Appendix B – Preliminary Appendix B – Preliminary Geotechnical Report - Geotechnical Report – page 5 page 5

2. This amendment is a part of the proposing papers and its receipt shall be acknowledged. All other conditions and requirements of the request for proposal remain unchanged.

3. Electronic Proposals. Provide proposals via the instructions provided in Section 00 22 00 of the Request for Proposal.

4. Offers will be received until 10:00 a.m., local time at place of receiving proposals, 22 FEB 2019.

Attachments:

Specification Pages listed in 1.b., above

U.S. Army Corps of Engineers, Omaha District 1616 Capitol Avenue Omaha, Nebraska 68102-4901

15 FEB 2019

nep/2160

Engineering Recommendations Provisions pertaining to design; based on previous design at Fort Carson are provided below. This preliminary design identifies soil conditions that the design build contractor must consider for proper foundation design.

Foundation Design The soils located on the project site are predominately composed of clay and shale; extending at least 25.0’ bgs. Swell tests performed indicate that the soil will heave. Swelling of expansive foundation soils should be considered during the preliminary design phase. The level of structural cracking that will be acceptable should be determined in accordance with ACI 224R-01. It is the Contractor’s responsibility to verify all laboratory test results. Typical foundations in this area of the installation contain both structures founded on conventional spread footings bearing on a layer of non-expansive engineered fill and those founded on drilled piers. It is the Contractor’s responsibility determine the specifics of the foundation system based on the available information and the information they will obtain during the final investigation.

Foundations shall be designed to limit the total settlement of any element not to exceed 1.0 inch and the differential settlement between any two adjacent elements shall not exceed 0.5 inches.

Utility Construction The addition of new utility lines requires either open trench or trenchless construction. For any open trench operations, 29 Code of Federal Regulations (CFR) Part 1926, Subpart P titled “Excavations” should be consulted to ensure adequate trench protection is in place. Contractors must also consider the shallow ground water table and create a dewatering plan suitable of keeping groundwater out of any open excavations for a period of time such all utilities may be installed.

Corrosion and Sulfate Risk Soil resistivity, conductivity, pH and sulfate tests were performed on four representative samples obtained from various depths across the project site.

Based on the results from resistivity testing; the soils on this site present a severe risk for corrosion potential. If steel pipes and or foundations are used, increased thickness of steel members or steel walled pipes must be considered to mitigate the risk of corrosive soil.

Sulfate attack is an issue that can be damaging to any concrete pavements. Sulfate ion content tests were performed on four representative samples from various depths across the project site and can be seen in table 2 above. According to the American Concrete Institution publication 201.2R a “Guide to Durable Concrete”, a “Very Severe” exposure classification to sulfate attack occurs when laboratory test results indicate that the Sulfate in Water (ppm) exceeds 10,000. For this project, native soils near the surface pose a very severe risk of sulfate attack.

Based on criteria outlined in ACI 201.2, a “severe” exposure condition is present, and sulfate-resistant cement will be required for concrete or grout in contact with soil and within 24 inches above final grade. Cement shall be:

Am #0006

Swelling of expansiveg phase. The foundation soils should be considered during the preliminary design level of g p y g p should be determined in accordance with ACIstructural cracking that will be acceptable 224R-01.