A.01.38_-_Attachment_6_-_USACE_Site_Visit_Report.pdf

US Army Corps of Engineers Europe District

APO AE 09049

ar113

Site Visit Report 4-5 October 2016

Kombewa Clinic Structural Repairs Kombewa, Kenya

Prepared by:

Design Section

Engineering Branch

19 December 2016

Site Visit Report Kombewa Clinic Structural Repairs 19DEC2016 Kombewa, Kenya

This Site Visit Report was prepared by Nicholas Wagman, Structural Engineer, USACE NAU Europe District Wiesbaden, Germany.

Table of Contents

A. Personnel B. Background C. Findings D. Actions Taken on Site E. Recommendations F. Path Forward

A. PERSONNEL

USACE TEAM

Mr. David Colberg, R.A., Program Manager, USACE Europe District David.A.Colberg@usace.army.mil, Ph. 4961197442763, BB: +491723962904

Mr. Nicholas Wagman, P.E., Structural Engineer, USACE Europe District Nicholas.A.Wagman@usace.army.mil, Ph. 4961197442547, BB: +491724470290

SFC Michael Taylor, CEMO, USACE Europe District

KENYA MEDCOM TEAM

Mr. Albert Kabbara, Chief General Engineer, Walter Reed Army Institute of Research Albert.A.Kabbara.CIV@mail.mil, Ph: +1 301 319 9992, Mobile: +1 301 592 7351 LTC Charles Lewis, OSC Chief LewisCW@state.gov, Ph: +235 2251 7009 Ext. 4295

MAJ Terrance Montgomery, Chief of Staff and CFO, US Army Medical Research Directorate – Kenya Terrance.Montgomery@usamru-k.org

Mr. Charles Kemboi, Kenyan Local National, US Army Medical Research Directorate – Kenya Charles.Kemboi@usamru-k.org

B. BACKGROUND

The project is located in Kombewa, Kenya proximate to the larger city of Kisumu. The facility consists of a medical research clinic with several labs, pharmacy, diagnostic rooms, records storage, and office spaces.

The original single story reinforced concrete and masonry facility was constructed in 2002 by Dabasia Builders Limited. As-built drawings exist for the original facility. In mailto:David.A.Colberg@usace.army.mil mailto:Nicholas.A.Wagman@usace.army.mil mailto:Albert.A.Kabbara.CIV@mail.mil mailto:LewisCW@state.gov mailto:Terrance.Montgomery@usamru-k.org mailto:Charles.Kemboi@usamru-k.org

2012, an additional story was constructed. The original roof was removed and masonry walls with a reinforced concrete floor slab were added. Schematic drawings of the addition by Linmond Investment Co. Ltd. exist, but not final as-built drawings (to my knowledge at this time).

Areas of the second story floor slab have recently exhibited cracking which precipitated a structural assessment by Kenyan AE Gibb International. The report by Gibb International dated 31 May 2016 was used as a basis for this site investigation. The Gibb International report suggests the second story concrete slabs have insufficient cover for the steel reinforcement and poor cement quality, which creates concern about the adequacy of those slabs to handle the live loads imparted in the facility.

This site visit was undertaken on 4-5 October 2016 to validate the conditions described in the Gibb International report and to identify any other areas of structural repair in order to prepare a schematic design and design build RFP to perform necessary repairs.

C. FINDINGS

1. The second story concrete floor slabs exhibit cracking and excessive deflection, particularly in areas with heavy live loads. Most second floor rooms exhibit hairline map cracking in the floor slabs.

2. The cracking in the top of the walls the second story Clinical Research Room and Common Room suggests that the bond beam is not adequately connected to the masonry wall below. Investigation suggests poor concrete mix: there is excessive large aggregate with poor cement bonding. Minor map cracking in the walls elsewhere in the facility is more likely typical plaster cracking.

D. ACTIONS TAKEN ON SITE

1. On the advice of USACE Structural Engineer: the administrative room underneath the library was locked out and a shoring plan provided to stabilize the library floor until repairs have been made. The clinic staff were working to relocate files from the file storage/library area to reduce the load.

2. On the advice of USACE Structural Engineer: the open terrace above the Pharmacy was locked out and a shoring plan provided to replace the existing shoring in the Pharmacy which was inadequate.

3. The Research Laboratory shoring was inspected and determined to be adequate as temporary shoring.

E. RECOMMENDATIONS

1. The terrace above the pharmacy and administrative room below the library/records room should remain unoccupied until structural repairs are completed.

2. Heavy loads from equipment or records should be permanently relocated to the first floor where possible (e.g. lab equipment, refrigerators and freezers, file storage).

3. Concrete core samples of the floor slabs should be taken (in areas specified by USACE) to test and measure the strength of the concrete and its reinforcement to aid the design of structural remediations.

4. Recommended repairs shall include:

a. New steel columns and foundations to correct deflection and provide additional support in the Research Laboratory and Microscopy Lab ceilings.

b. A new bearing wall and foundation will replace an existing beam in the first story Data Records storage room. This wall will in turn support new steel stringers to increase the capacity of the floor under the second story Library/File Storage area.

c. 2 new cast in place concrete columns and foundations shall be added to support the cantilevered terrace around the center courtyard.

d. Depending on material test results, additional reinforcement may be required for the Clinical Laboratory.

F. PATH FORWARD

1. US Army Medical Research Directorate – Kenya is assisting USACE in obtaining material test data of the existing concrete slabs to aid the design effort. Plans with locations and instructions for obtaining the concrete samples were provided by USACE Structural Engineer. This test data results are expected mid-January 2017.

2. Upon receiving the concrete test data, USACE Structural Engineer will prepare a structural design package to repair or remediate the damaged slabs and provide additional structural support to prevent future slab cracking. The design build RFP package will be prepared in February including Internal Technical Review

(ITR).

19 December 2016