Amendment 0006 to W912UM23R0010_18APR23.pdf

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

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.

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

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

a. This amendment is issued to provide Attachment F - Geo Report to Solicitation documents.

b. All other terms and conditions remain the same.

1. CONTRACT ID CODE PAGE OF PAGES

J 1 2

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

16C. DATE SIGNED

BY

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

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

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912UM23R0010

X 9B. DATED (SEE ITEM 11)

23-Mar-2023

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

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

Offer 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 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 telegram 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 telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

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

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

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

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, 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)

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

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

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO.

5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

18-Apr-2023

CODE

CONTRACTING DIVISION

U.S. ARMY CORPS OF ENGINEERS

FAR EAST DISTRICT

UNIT #15546

APO AP 96271

W912UM 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

EMAIL:TEL:

W912UM23R0010

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

(End of Summary of Changes)

CEPOF-EDG-G 10 Oct 2019

MEMORANDUM FOR CEPOF- PPA (Mr. Pil Park)

SUBJECT: Memorandum for the Foundation Design Recommendations for the FY19 MCA PN 91589 Command and Control Facility, Command Post (CP) Tango, Korea (G&EE Project 20-001G/Report G2020-003)

1. A Command and Control Facility (C2F) will be constructed in tunnel Zero in CP Tango. The proposed facility is a two-story PEB (Prefabricated Engineered Building) building with approximate dimension of 15.6 meters by 15.6 meters.

Refer to the project location in Plate 1.

The enclosed memorandum provides the foundation recommendations for the proposed C2F based on the visual inspection and field strength test results performed by the Geotechnical and Environmental Engineering (G&EE) Branch.

2. A geotechnical engineer and a geologist visited a project site on 8 Oct 2019 and performed the visual inspection and field strength tests to estimate the rock bearing capacities. The proposed facility area were filled with rock fragments form the excavation by blasting at the time of site visit. Depth of the rock fragments ranged from 1 to 2 meters based on the information from the project engineer (Mr. Jay Kashiwamura). Therefore, the rock strengths were measured at the side walls on the assumption that the rock strengths at the walls are similar to the bottom.

3. Schmidt hammer was used to estimate rock strengths. Three locations (locations A, B, and C, refer to Plate 2) were chosen and the estimate rock strengths and rock joint frequency/joint conditions are provided in Table 1.

The conversion procedure from Schmidt hammer values to unconfined compression strengths (UCS) was also shown on Plate 2.

Table 1: Estimated Rock Strengths and Joint Conditions

Test Location Schmidt Value

Rock UCS (Mpa)

Joint frequency Infilling Aperture

A 70 147 3 Joints in 4 meters no filling closed

B 52 42 2 Joints in 3 meters filled with clay narrow less than 1 cm aperture

C 42 21 2 joints in 2 meters no filling closed

4. From the field test results and our visual inspections, the rock bearing capacity are estimated as follows.

Qallowable in Rock = Ksp * UCS --------------- (eq.1)

Figure1: Ksp coefficient (referred to Canadian Foundation Engineering Manual

4th Edition)

Based on the Figure 1, the estimated allowable rock bearing capacity is 3,150 kPa. Considering provided structure load of 478 kPa and rock bearing capacity obtained, the proposed C2F can be adequately supported on a shallow foundation system (mat foundation).

Based on the visual inspection at the project site, the detecting water level is much higher than the building Finished Floor Elevation (FFE), which would require dewatering. Therefore, adequate drainage controls during construction need to be implemented as required to maintain a dry excavation. In addition, waterproofing will be required to protect smearing water in the building and foundation system.

5. For clarification or additional recommendations, please contact Mr. Yu, Yon-Chun at 755-6545 or Mr. Lee, Sun H. at 755-6115. The Geotechnical and Environmental Engineering Branch should be alerted to any significant changes to the project design so that additional geotechnical input can be provided as appropriate.

Attachment:

FAR EAST DISTRICT

CORPS OF ENGINEERS

Geotechnical and Environmental Engineering Branch

Project Location Map PLATE 1FY19 MCA PN 91589 Command and Control Facility, CP Tango (G&EE# 20-001G)

Proposed command and control facility

FAR EAST DISTRICT

CORPS OF ENGINEERS

Geotechnical and Environmental Engineering Branch

Schmidt Hammer Test Locations (Approx.)

PLATE 2FY19 MCA PN 91589 Command and Control Facility, CP Tango (G&EE# 20-001G)

A

B

C

A

B

C