QA_19C02026Q0023_CMR Perimeter Wall.pdf

SENSITIVE BUT UNCLASSIFIED

Q&A

RFQ_19C02026Q0023

CMR Perimeter wall Reinforcement Design

1. Must all three geotechnical alternatives provide for preservation of the existing wall, or is it permissible to propose alternatives involving construction of a new retaining structure?

RTA 1: construction of a new retaining wall structure can be proposed as one of the alternatives.

2. What cultural heritage implications apply to the retaining wall?

RTA 2: The wall is not cultural heritage

3. What is the scope of work with respect to the permitting procedures before the Instituto Distrital de Patrimonio Cultural (IDPC), Bogotá's district cultural heritage authority?

RTA3: No IDPC permit procedures shall be included as part of this solicitation

4. Should the geotechnical alternatives be developed on the assumption that the trees will be removed, or that they will remain in their current location?

RTA 4: Among the 3 posibilities of solution required, the contractor shall contemplate both scenarios.

5. Is it feasible to carry out retaining/earth-retention works within the property boundaries?

RTA5: If the questions refer to carry out soil testing activities inside the CMR boundaries, yes. This shall be included as part of this solicitation.

6. Will the costs of preparing and implementing the Plan de Manejo de Tránsito (PMT, traffic management plan) for the geotechnical exploration be reimbursed by the Client?

RTA 6: this cost shall be included in the hour cost as part of this solicitation.

7. Which guarantees/bonds are required by the Client for the design, and what are their terms (coverage periods)?

https://ilmsariba.state.sbu/Buyer/Main/aw?awh=r&awssk=92ml&dard=1

RTA 7: No guarantees or bonds are required for the design services under this project. The required assurance for this project is the Contractor’s full and satisfactory delivery of all services, documents, designs, and deliverables specified in the SOW.

8. Are there any prior geotechnical, topographic, or structural pathology

(condition assessment) studies of the wall, or records of previous maintenance/repair works?

RTA8: Please attachment 3 & 4 with available information

9. Is there a reference budget or an expected cost range for the construction phase? It helps us to address the proposal alternatives.

RTA9: The budget shall be developed based on the chosen conceptual option that needs to be developed in detail.

10. May the trees located on top of the wall be pruned, relocated (transplanted), or removed as part of the proposed solution?

RTA10: Refer to answer No.4

11. What are the actually authorized working hours for the drilling (borehole) operations?

RTA11: Working hours are Monday-Friday from 8am-5pm. No local and American holidays.

12. If earhtworks are required in existing slope, those changes shall be approved by Instituto Distrital de Patrimonio Cultural (IDPC)?

RTA12: Not required.

13. If we were awarded for design project will be banned for construction project?

RTA13: The design company cannot participate in the construction bid.

14. Please confirm why if this is a design project in Quantity Chart template there is an AIU cost structure, including a VAT for profit?

RTA13: Please see revised quantity chart for proposal or attachment 2.

Neither AIU Nor DBA shall be quoted

15. Wall Length and Geometry: Section B.2.1 identifies the wall height as approximately 2.8–3.5 meters but does not specify the overall wall length.

Based on our preliminary review, we estimate an approximate length of 61 meters on one side of the access gate. Please confirm whether the scope includes both sections of the retaining wall located on either side of the gate.

If so, please provide or confirm the approximate total linear length to be evaluated and stabilized.

Please also confirm whether the wall height and cross-section are uniform or vary along its length.

RTA15: Refer to answer No. 8

16. Photographic Record / Existing Distress: Is there an available photographic record documenting the current condition of the retaining wall, including any observed cracking, lateral displacement, deterioration, drainage issues, or other visible distress, that can be provided to offerors?

RTA16: Refer to answer No. 8

17. SAM Registration: Section J states that SAM registration is not required for proposal submission.

On the other hand, the Cover Letter lists “Proof of SAM Registration” as optional; however, it also states that offerors shall be registered in SAM prior to submission and that failure to be registered may result in the proposal being considered non-responsible.

Could you please confirm whether an active SAM registration and proof thereof, including the UEI number, are mandatory at the time of quotation submission?

RTA 17: Registration in SAM.gov is not required. But if you are already registered, you can send us the registration proof.

18. Performance and Payment Bonds / Structural Stability Bond: Item 12A of SF-

1442 expressly indicates “NO” in response to the question, “The Contractor must furnish any required Performance and Payment Bonds?” However, Section 10.4 of the SOW requires a formal letter confirming the offeror’s ability to secure the required Performance Bonds, Structural Stability Bonds, and Third-Party Liability Insurance.

Could you please clarify whether Performance Bonds, Payment Bonds, and/or Structural Stability Bonds will be required from the successful contractor?

RTA18: No guarantees or bonds are required for the design services under this project. The required assurance for this project is the Contractor’s full and

19. Errors and Omissions / Professional Liability Insurance: Section J requires a copy of a liability insurance policy covering errors and omissions.

Could you please confirm if a liability insurance policy covering errors and omissions is required?

RTA19: No guarantees or bonds are required for the design services under this project. The required assurance for this project is the Contractor’s full and

20. Financial Statements – Submission Timing: Section J lists a copy of the firm's financial statement among the information to be included in the quotation.

However, Section J.4.0 states: “If asked by the Contracting Officer, the offeror shall provide a current statement of its financial condition” Could you please confirm whether the financial statements described in Section J.4.0 must be submitted with the initial quotation or only upon request by the Contracting Officer.

If they must be submitted with the quotation, please confirm the required reporting periods/cut-off dates for the Comparative Income (Profit-Loss) Statement, Balance Sheet, and Cash Flow Statement.

RTA20: The offeror shall provide the company’s financial statements for the last three (3) fiscal years, including the Balance Sheet, Income Statement, and related notes, duly certified by the company’s Statutory Auditor (Revisor Fiscal).

21. Is DBA required as part of this solicitation?

RTA21: No, DBA will not be required.

USA EMBASSY BOGOTA UNIT QUANTITY

Item COP

Phase I Site Investigation Site reconnaissance & condition assessment Ls 1 $0 Principal Hr Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Topographic & geometry survey Ls 1 $0 Principal Hr Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Junior Geotechnical Engineer Hr Core drilling & field investigation Ls 1 $0 Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Junior Geotechnical Engineer Hr Clerical / Administrative Hr Laboratory testing Ls 1 $0 Senior Geotechnical Engineer Hr Clerical / Administrative Hr Junior Geotechnical Engineer Hr

Phase II Geotechnical and Structural Assesment Geotechnical analysis Ls 1 $0 Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Junior Geotechnical Engineer Hr Structural & geotechnical modeling Ls 1 $0 Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Principal Hr CADD / BIM Operator Hr Stability verification Ls 1 $0 Senior Geotechnical Engineer Hr Senior Structural Engineer Hr Principal Hr Architectural development Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr CADD / BIM Operator Hr Phase III Concept Engineering Design and Solutions Technical recommendation Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr Phase IV Detalied and Engineering Design with Specialties Detailed engineering design (IFC) Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr CADD / BIM Operator Hr Senior Geotechnical Engineer Hr Drainage & landscaping integration Ls 1 $0 Senior Structural Engineer Hr CADD / BIM Operator Hr

QUANITY CHART FOR PROPOSAL - CMR RETAINING WALL

United States Department of State U.S. Embassy Bogota, Colombia

Facility Management

Senior Geotechnical Engineer Hr Phase V Documentation, Specification and Scheduling Technical specifications (OBO) Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr Cost estimate & schedule Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr Phase VI Agency Review and Support FAC/OBO review & comments resolution Ls 1 $0 Senior Architect Hr Senior Structural Engineer Hr Principal Hr Total Cost $0

VAT 19%

Grand Total COP

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EVALUATION OF AN EXISTING RETAINING

WALL LOCATED AT THE CHIEF OF MISSION

RESIDENCE (CMR) IN BOGOTA, COLOMBIA

DICEIN LTDA

DISEÑOS Y CONSTRUCCIONES

ESPECIALIZADAS EN

INGENIERÍA

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RETAINING WALL CMR\INFORMES\EG RETAINING WALL

CMR (JAP).docx

DISEÑOS Y CONSTRUCCIONES ESPECIALIZADAS EN INGENIERÍA – DICEÍN LTDA

Calle 85 A No. 24 – 71 – Segundo Piso B. El Polo

PBX: 218 85 10 – 691 34 21 - Correo Electrónico: info@dicein.com www.dicein.com

CONTROL SHEET

Name / Position Date Signature

PRODUCED AND

REVIEWED:

JORGE ARTURO PINEDA

TECHNICAL COORDINATOR November 2.009

REVIEWED AND

APPROVED:

ALEXANDRA BEJARANO

MANAGER November 2.009

CHANGE CONTROL

Version No. Date Description change

00 October 2.009 Initial Version

CONTROL OF DISTRIBUTION OF COPIES

DISTRIBUTED TO:

Copy No. DATE Name / Position ENTITY

November 2.009

ING. PEDRO BUENO

AMERICAN EMBASSY

02 November 2.009 DICEIN LTDA ARCHIVE

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CA – F - 027

ESPECIALIZADAS EN INGENIERIA

PROJECT SUMMARY SHEET VERSION SGC – JUNE 2.009

SERIAL NUMBER OF

PROJECT D-P-0128 -09

PROJECT SCOPE

EVALUATION OF AN EXISTING RETAINING WALL LOCATED AT THE CHIEF OF MISSION RESIDENCE

(CMR) IN BOGOTA, COLOMBIA

CONTRACTING

ENTITY

AMERICAN EMBASSY

DATE 20 NOVEMBER 2009

Ground exploration Four (4) boreholes executed with mechanical equipment.

Four (4) exploration trenches.

RESUME FOR THE

GEOTHECNICAL

SOLUTION

SLOPE STABILITY FOR THE SOIL MASS BEHIND THE RETAINING WALL: ACCORDING TO THE

TOPOGRAPHICAL SURVEY AND THE SLOPE STABILITY ANALYSIS DEVELOPED FOR EACH SOIL PROFILE DEFINED IN SECTION 6.1, IT WAS FOUND THAT THE SOIL MASS DOESN´T COMPROMISES THE STABILITY

OF THE RETAINING WALL.

FOREST SURVEY: ALL TREES LOCATED NEAR THE TOP OF THE RETAINING WALL MUST BE CUT OFF AND

REPLACE ACCORDING TO FINAL RECOMMENDATIONS PRESENTED IN SECTION 5.5.

SOUTHWEST SIDE RETAINING WALL: ACCORDING TO STABILITY ANALYSIS THESE PARTICULAR SECTION

ONLY NEED MAINTENANCE WORKS DESCRIBED IN SECTION 8.3.1.

NORTHEAST SIDE RETAINING WALL: ACCORDING TO STABILITY ANALYSIS THESE PARTICULAR SECTION MUST BE REPLACED IN ITS TOTAL LENGTH BY A NEW REDESIGNED CANTILEVER WALL PRESENTED IN

SECTION 7.3.3.

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INDEX

1. GENERALITIES

1.1. INTRODUCTION

1.2. LOCATION AND DESCRIPTION OF THE PROYECT

1.3. BACKGROUND

1.4. SCOPE

1.5. RECOPILATION AND ANALYSIS FOR EXISTING INFORMATION

1.6. GENERAL DESCRIPTION OF THE REPORT

2.1. GEOLOGY AND GEOMORPHOLOGY

2.1.1. REGIONAL AND LOCAL GEOLOGY

2.1.2. GEOMORPHOLOGY

2.2. HYDROLOGY AND WEATHER

3 FIELD VISIT AND SUBSOIL EXPLORATION

3.1. FIELD VISIT

3.2. DRILLING TESTS PERFORATIONS AND BOREHOLES

3.3. LABORATORY TESTS

4 TOPOGRAPHICAL SURVEY

4.1 FIELD METHODOLOGY

4.2 MATERIALIZATION AND LYING OUT OF POINTS TO MONITOR

4.3 PROCESS OF OFFICE

4.4 STAFF

4.5 EQUIPMENT AND FEATURES

5 FOREST SURVEY

5.1 PURPOSE AND SCOPE

5.2 METODOLOGY

5.2.1 FIELD PHASE

5.2.2 PHASE OFFICE

5.3 RESULTS

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5.3.1 FLOWER IDENTIFICATION

5.3.2 DIAGNOSIS

5.4 INSTRUCTIONS FOR THE CYPRESSES NEAR THE WALL

5.5 RECOMENDATIONS

6 GEOTECHNICAL REPORT

6.1 STRATIGRAPHY AND INDEX PROPERTIES

6.2 WATER TABLE LEVEL

6.3 COMMENTS ABOUT THE SUBSOIL EXPLORATION PROGRAM

6.3.1 RETAINING WALL GEOMETRY

6.4 STRENGHT AND STIFFNESS PROPERTIES OF THE SOIL BEHIND THE RETAINING

WALL

6.4.1 UNCONFINED COMPRESSIVE STRENGTH

6.4.2 UNIT WEIGHT (DENSITY)

6.4.3 DIRECT SHEAR STRENGTH

6.5 SEISMICITY

6.6 CRACKS INVENTORY

7 GEOTECHNICAL ANALYSIS FOR THE ACTUAL RETAINING WALL

7.1 SLOPE STABILITY ANALYSIS

7.2 LATERAL EARTH PRESSURES

7.2.1 CROSS SECTION ANALYSIS

7.2.1 STATIC LATERAL EARTH PRESSURES ANALYSIS

7.2.2 PSEUDO-STATIC LATERAL EARTH PRESSURES ANALYSIS

7.3 PROPOSED REDESIGN OF THE RETAINING WALL

7.3.1 GRAVITY WALL – ALTERNATIVE 1

7.3.2 GRAVITY WALL – ALTERNATIVE 2

7.3.3 CANTILEVER WALL – ALTERNATIVE 3

8 CONCLUSIONS AND RECOMMENDATIONS

8.1. TOPOGRAPHICAL SURVEY

8.2. REMOVAL OF VEGETATION COVER

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8.3. RETAINING WALL

8.3.1. SOUTHWEST SIDE WALL

8.3.2. NORTHEAST SIDE WALL

8.4. OTHER RECOMENDATIONS

9. LIMITATIONS

Lista de Tablas Table 1. Subsoil drill exploration inside CMR – Bogotá. (NR: Not registered)

Table 2. Subsoil trenchs exploration inside CMR – Bogotá. (NR: Not registered)

Table 3. Normativity associated to the subsoil exploration program

Table 4. Summary of existing species in the area inventoried

Table 5. Summary of principal characteristics for existing species in the survey area, section 1 (source:

IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”.)

Table 6. Summary of principal characteristics for existing species in the area inventoried, section 2 (Source: IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”)

Table 7. Summaryof principal morphological, phandsiological yothers for the species on the survey(Source: IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”). 25

Table 8. Conventions used (Source: IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”)

Table 9. List of individuals studied in the House, state and recommendations

Table 10, Resume properties chart for Soil Profile 1

Table 11, Resume properties chart for Soil Profile 2

Table 12, Resume properties chart for Soil Profile 3

Table 13, Representative values for the rock cores tested at unconfined compression

Table 14, Representative values for the simple tested by direct shear

Table 15. Parámetros Geosísmicos (Tomados de “Mapa de microzonificación sísmica de Bogotá“)

Table 16, Safety factors associated to the slope stability scenarios modeled for each soil profile presented behind the retaining wall

Table 17, Static lateral earth pressure results for each soil profile

Table 18, Pseudo-static lateral earth pressure results for each soil profile

Table 19, Static lateral earth pressure results for each soil profile, for the proposed gravity wall – alternative 1

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Table 20, Pseudo-static lateral earth pressure results for each soil profile, for the proposed gravity wall – alternative 1

Table 21, Static lateral earth pressure results for each soil profile, for the proposed gravity wall – alternative 2

Table 22, Pseudo-static lateral earth pressure results for each soil profile, for the proposed gravity wall – alternative 2

Table 23, Static lateral earth pressure results for each soil profile, for the proposed cantilever wall – alternative 3

Table 24, Pseudo-static lateral earth pressure results for each soil profile, for the proposed cantilever wall – alternative 3

Figure List

Figure 1. General location at national and regional level

Figure 2. Bogotá localities map, the green square remarks the location of the project

Figure 3, routes of access of the Project. (Source: Google Maps)

Figure 4, Geologic Map of Bogotá, inside the remark zone is the Project site

Figure 5, Frecuence of arboreal species founden in the forest survey

Figure 6, Soil profile 1 (Boreholes 1 and 2)

Figure 7, Soil profile 2 (Borehole 3)

Figure 8, Soil profile 3 (Borehole 4)

Figure 9, typical cross section assumed for the retaining wall (all dimensions in meters)

Figure 10, failure surface for the critical scenario of the soil mass behind the retaining wall for the soil profile 1(STED v6.54i)

Figure 11, failure surface for the critical scenario of the soil mass behind the retaining wall for the soil profile 2(STED v6.54i)

Figure 12, failure surface for the critical scenario of the soil mass behind the retaining wall for the soil profile 1(STED v6.54i)

Figure 13, simplified cross section of the retaining wall, the subdivision points made part of the lateral earth pressure analysis, (all dimensions in meters)

Figure 14, cross section gravity wall - alternative 1

Figure 15, cross section gravity wall - alternative 2

Figure 16, cross section cantilever wall - alternative 3

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Photography List

Photography 1. Cypress tree evaluated (individual 1)

Photography 2. Acacia tree near the wall

Photography 3. Jasmine tree near the wall

Photography 4. Ash trees near the wall, with few leaves

Photography 5. Eucalyptus trees overmature

Photography 6. Pine Tree steep

Photography 7. Overview of House hedge

Photography 8. Panoramic of the west side Hedge

APPENDICES

APPENDIX 1. SUBSOIL EXPLORATION

Drilling record Laboratory test record Resume Charts for geotechnical parameters Topographical field record

APPENDIX 2. CALCULATION CHARTS

Slope stability analysis Lateral earth pressures analysis Structural design for retaining wall

APPENDIX 3. TECHNIC SPECIFICATIONS

APPENDIX 4. DESIGN DRAWS

Soil profile cross sections and land survey Soil profile cross sections Cracks inventory Forest inventory Structural design of proposed retaining wall

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EVALUATION OF AN EXISTING RETAINING WALL

LOCATED AT THE CHIEF OF MISSION RESIDENCE (CMR)

IN BOGOTA, COLOMBIA

1. GENERALITIES

1.1. INTRODUCTION

The GENERAL SERVICES OFFICE, of the American Embassy in Bogotá hired with DICEIN Ltda the evaluation of an existing retaining wall located at the chief of mission residence (CMR) in Bogotá – Colombia.

The report contains a summary of the field work performed, the scope of subsurface exploration performed, field/laboratory tests, the performance of geotechnical analysis, and the particular structural analysis done. All the respective plans are shown in the appendixes.

1.2. LOCATION AND DESCRIPTION OF THE PROYECT

The site project is located in the city of Bogotá, near the eastern hills at the 78 street with 3rd avenue, in “Los Rosales” neighborhood, more precisely at the urban nomenclature 78 # 3–13.

On figures 1, 2, and 3 are shown the geographical context of the Project, and the site location.

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Figure 1. General location at national and regional level.

Figure 2. Bogotá localities map, the green square remarks the location of the project.

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Figure 3, routes of access of the Project. (Source: Google Maps)

1.3. BACKGROUND

According to the request for the present project (reference 6), the CMR residence is a two-story concrete structure constructed in 1951 and is about 5.9 kilometers northeast of the Chancery. The rectangular shaped site is approximately 2.2 hectares in size. Site improvements include a tennis court, guard booths, several out-buildings, two access roads, typical parking and landscaping, security fencing, and a perimeter wall on the northern perimeter of the site.

Above and below ground utilities are present throughout the site. Topographically, the site is located on the side of a sloping hill that trends south to north, ranging in elevation between + 647 m and + 613 m, respectively. There are two access points on the site. One access point is via the western boundary of the site. The second access point is located on the northern boundary of the site and bisects the northern retaining/perimeter wall. This access point was recently completed in February 2004. Site vegetation consists of well maintained and landscaped trees, shrubs, gardens, and lawn areas. Numerous large diameter trees are located within the site and adjacent to the northern perimeter of the site.

Av. 7

A v.

(C irc u n va la r)

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The northern perimeter wall was constructed in 1950 and also serves as retaining wall. The wall consists of two segments, the northeast and northwest segments and are approximately 70 and 60 meters long, respectively. The RTW ranges between 2.8 and 3.5 meters in height.

1.4. SCOPE

The main scope for the present report is to establish the proper conclusions and recommendations about the stability and structural integrity of the retaining wall in mention, according to the requirements given by the applicable standards of ASTM or its equivalent with the Colombian Techniques Standards –“Normas Técnicas Colombianas, NTC”-, and the costruction and behave seismic response –“Norma Sismo Resistente, NSR 98”-.

The principal scopes of the present report are:

• Geologic and geomorphologic research at regional and local level near the project area.

• The implementation of an accurate subsoil research program, with highly quality standards to obtain the best geotechnical information related to project’s place, according the demanded requirements in the study specifications.

• The implementation of standardized laboratory tests, which allow characterizing the materials geo-mechanic behavior of the foundation soil of the project’s place.

• The right implementation of Geotechnical Engineering theoretical concepts – foundations, soils, stability, among others - and Structural Engineering combined with the practical expertise, in order to achieve the formulation of the best technical alternatives to the recuperation or reconstruction of the existing wall.

• Integration of QUALITY concept in the implementation in ever single stage of the Geotechnical Research in the specialized consultancy in geotechnical and structures;

as well as in the achievement of its results.

1.5. RECOPILATION AND ANALYSIS FOR EXISTING INFORMATION

During the elaboration of the present report we take care some information in the next references:

• “Foundation Analysis and Design”. Bowles J.E. 1997. Fifth Edition, Ed. McGraw-Hill.

(Reference 1)

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• “Principios de Ingeniería de Cimentaciones”, Braja M. Das, 2001. Cuarta Edición, Ed.

Thomson Learning. (Reference 2)

• “Normas Colombianas de Diseño y Construcción Sismo Resistente (NSR-98)”.

Asociación Colombiana de Ingeniería Sísmica, 1998. (Reference 3)

• “Mapa Geológico y Memoria Explicativa de la Sabana de Bogotá”.

INGEOMINAS, 2005. (Reference 4)

• “Rock Foundations – Engineer Manual 1110-1-2908”. US Army Corps of Engineers, 1994. (Reference 5)

• “Request for Quotations – No. S-CO200-09-Q-0018” General Services Office, 2009.

(Reference 6)

• CPU – Jardín Botánico de Bogotá (JBB). Informe Final del Diseño Preliminar para el Manual Verde, 1999. (Reference 7)

• DAMA. Manual de Arborización Urbana para Santa Fe de Bogotá (1998). (Reference 8)

• DAPD. Manual de Espacio Público, 2000. (Reference 9)

• IDU – DAMA – JBB. Guía de Lineamientos Ambientales para el Diseño de Proyectos de Infraestructura Urbana y Espacio Publico Construido, 2002. (Reference 10)

• IDU – DAMA – JBB Complementación del Diseño Preliminar para el Manual Verde, 2002. (Reference 11)

• IDU – DAMA – JBB. Manual de Procedimientos de Gestión Ambiental del Proyectos de Infraestructura y Espacio Publico Construido, 2002. (Reference 12)

• IDRD. Plan de Manejo Ambiental Típico para el Sistema de Parques Distritales, 2001.

(Reference 13)

• JBB. Manual de Arborización para Bogotá D.C, 2000. (Reference 14)

• Mahecha, G. Clave para la identificación de géneros de árboles, arbustos y palmas, entrada por hojas, estípulas y exudaciones. JBB – UDFJC. 2007. (Reference 15)

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1.6. GENERAL DESCRIPTION OF THE REPORT

This report is divided into nine (9) chapters, which presents the results of field/laboratory activities, particularities of the geotechnical analysis and its main conclusions and recommendations for the integral geotechnical solution. The following is a summary of the contents of each chapter:

In Chapter 1, we present the description of the features of the project to develop the scope of this report, recopilation and analysis of existing information.

In Chapter 2, is presented the geological description of the project area, together with the geomorphology, weather prevailing where the project is located.

In Chapter 3, is presented in detail the subsoil exploration program carried out in order to establish the physical and geomechanical properties.

In Chapter 4, we show the variation of physical and geomechanical properties of the materials that form the foundation soil profiles developed, recording the depth and subsurface geoseismic main parameters of the project site.

In Chapter 5, is presented the detail of the forest survey, the methodology developed, indentifying the principal flowers, trees and their incidence on the stability of the retaining wall, and the proper manner to proceed for its intervention.

In Chapter 6, is presented the variation of physical and geomechanical properties of the materials that form the foundation soil profiles developed, recording the depth and subsurface geoseismic main parameters of the project site, also is presented the cracks inventory developed along the retaining wall.

In Chapter 7, is presented in detail the geotechnical analysis of stability developed for different cases, taking into account the incidence of the slope, lateral earth pressures behind the wall, and some proposals for the stabilization of the actual retaining wall.

In Chapter 8, is presented the final conclusion according to the surveys developed, analysis and all the recommendations proper for the structural design and construction for the retaining wall for each section. Also is presented other recommendations to take into account in the activities near the wall.

In Chapter 9, is presented the principal limitations for the present report, consistent with the activities and the reliability of geotechnical parameters established, among other possible sources of uncertainty.

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2. GEOLOGICAL, GEOMORPHOLOGICAL AND HYDROLOGICAL

CHARACTERISTICS OF THE SITE PROJECT

2.1. GEOLOGY AND GEOMORPHOLOGY

2.1.1. Regional and local Geology

The Project site is located over the Labor-Tierna geologic formation (K2t), composed principally by sanstones and interlayer mudstones on the top, occasionally it is possible to find bentonitic clays between layers, the average depth of the formation is between 177m and 66m (Etayo, 1968), the age rate of the formation is from the Cretaceous period in the Maastrichtian (aprox. 70 million years ago). Aditionally, in the west side of the project are located slope deposits (coluvions), composed by coarse blocks surrounded by a silt-sandy matrix, with a age rated in the Holocene (11 thousand years ago). In tectonical view the area is crossed by de east for the Bogota’s anticlinal, properly for the near position to the central mountain range system, in the eastern hills.

Figure 4, Geologic Map of Bogotá, inside the remark zone is the Project site.

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2.1.2. Geomorphology

Project site is located in a sloping zone in north-east direction, with differences of level near the retaining wall of 4.5 m in the north side, and 1.0 m in the south side; crossed by a access road connecting the 4th avenue with CMR.

2.2. HYDROLOGY AND WEATHER

The Project zone presents an average weather temperature of 14,2°C, relative humidity in rainy months of 74 – 77%, in dry months 66 – 74%, and a total annual precipitation level of 1000 –1200 mm. The hydrological net is composed principally by Rosales creeck, which is one of the tributaries of the Arzobispo River.

3 FIELD VISIT AND SUBSOIL EXPLORATION

In this chapter are shown the principal characteristics and scopes of the subsoil investigation executed and the applicable standards of laboratory tests.

3.1. FIELD VISIT

It was made a reconnaissance visit to the project site by a group of geotechnical engineers, in order to obtain a first approximation to the physical environment of the area and determine the extent of the subsoil exploration work established by the client and its correspondence to the scope of the project.

3.2. DRILLING TESTS PERFORATIONS AND BOREHOLES

In order to obtain a full knowledge about the stratigraphy and subsurface mechanical properties of soils and rocks, it was carried out a research program to the extent described below and shown on tables 1 and 2:

It was developed four (04) boreholes with a level below the ground level between 4.0 m and

8.3 m, and four (04) trenches with depths of 0.9 and 2.0 m below the ground level. Samples were taken from each stratum founded, with Split Spoon for altered samples, Shelby tube for unaltered samples, NQ core for rock samples, and bags for superficial samples.

Each sample was visually classified on field, labeled, and properly package for its transport to laboratory. From the drilling tests and boreholes it was made a field record, taking note of type and depth of each sample, visual description of the materials present in each layer, and the depth when occurs stratigraphy changes accordingly with the field tests made.

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EXECUTED DRILLS

PERFORATION DEPTH (m) GWT (m) NORTH COORD. EAST COORD. Num of Samples

1 4.20 NR 4°39’35.7” 74°02´54.2” 6

2 7.50 NR 4°39’35.8” 74°02’58.8” 15

3 4.00 NR 4°39’35.6” 74°02’55.5” 7

4 8.30 NR 4°39’34.4” 74°02’57.2” 13

Table 1. Subsoil drill exploration inside CMR – Bogotá. (NR: Not registered)

EXECUTED TRENCHS

PERFORATION DEPTH (m) GWT (m) NORTH COORD. EAST COORD. Num of Samples

1 1.00 NR 4°39’36.7” 74°02´35.1” -

2 1.00 NR 4°39’36.7” 74°02’54.5” -

3 0.90 NR 4°39’35.9” 74°02’56.7” -

4 2.00 NR 4°39’35.5” 74°02’56.5” -

Table 2. Subsoil trenchs exploration inside CMR – Bogotá. (NR: Not registered)

3.3. LABORATORY TESTS

The laboratory tests program included humidity content, granulometry with wash on sieve 200, consistency limits, Direct Shear, Unitary y Specific weight, and unconfined Compression.

Those tests were made taking care of the standards showed in table 3.

EXPLORATION PROGRAM OF SUBSOIL

TEST STANDARD

Standard Recommended Practice, for Investigating and Samplig Soil and Rock, for Engineering Purposes ASTM-D-240

Test Method for Dry Preparation of Soil Samples for Particle-Size Analysis and Determination of Soil Constants ASTM-D-421

Test Method for Particle-Size Analysis of Soils ASTM-D-422

Standard Practice for Thin-Walled Tube Sampling of Soils for Geotechnical Purposes ASTM – D1587-08

Standard Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils ASTM – D4318-05

Standard Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass ASTM – D2216 - 05

Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer ASTM – D-854 - 06

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Standard Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System) ASTM – D2487

Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions ASTM D3080 - 04

Standard Test Method for Unconfined Compressive Strength of Cohesive Soil ASTM – D2166-06

Table 3. Normativity associated to the subsoil exploration program

In Appendix 1, Subsoil research, are shown the laboratory tests made in samples taken from the subsoil exploration.

4 TOPOGRAPHICAL SURVEY

4.1 Field methodology

Based on two points within the project materialized with arbitrary coordinates, topographic survey was carried out of the retaining wall with hanging ledge definition, sidewalks, sidewalk curb, hard areas, fences, power poles, telephone poles, valves, water meters, sewage meter boxes, important trees, road crossings and other important details in the section for proper demarcation. It also took the record of the fissures on the internal access road.

All details were taken with a total station and stored in electronic book, where the points that allow the definition of the plant were leveled trigonometrically to generate contours.

Details were taking with the next procedure:

• Telephone boxes: point raised in its center.

• Energy boxes: points raised at least three corners of the same and classified as double boxes, single boxes or boxes simple step.

• Sanitary sewers: points raised at its center point.

• Aqueduct valves: points raised at its center point.

• Water meters: point raised at its center.

• Sewage meter boxes: points raised at least three corners.

• Hydrants: The point raised in the center.

• Traffic lights: raised dots on its axis distance and azimuth at the center.

• Sinks grid: points raised in two points of it.

• Sink side entrance: points raised in two points of it.

Poles

• Power poles: points raised in the horizontal dimension and azimuth to the center axis.

• Telephone pole: Points raised in the horizontal dimension and azimuth to the center axis.

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• High voltage poles: points raised in the horizontal dimension and azimuth to the center axis.

Fencing:

• Points raised; breaks, corners, curves, etc. Specifying the type of enclosure: wire fence, net fence, or in aluminum cladding.

Sidewalk curb:

• Points raised, all the necessary points are specifying in the next way:

PC: Point where sidewalk curb begins.

PCC: Point where sidewalk curb curve.

PT: Point where sidewalk curb ends.

Facings:

• Points raised: all the necessary points that were considered specifying the detail. These details are: corners, curves (PC, PCC, PT) breaks and addresses.

Trees:

• Point raised: in the horizontal dimension at the azimuth axis and the center.

Construction:

• They got all the points related to construction, as corners, cracks, addresses and other details that alignments clarify their status as facings.

Wall

• It was raised up all the horizontal and vertical brakes of the wall located in the western side of the project (4th avenue).

4.2 MATERIALIZATION AND LYING OUT OF POINTS TO MONITOR.

After the topographical survey around the wall, it were materialized six (6) points within the project, and twelve (12) points on the wall located in the 4th avenue between 78th and 80th street in order to track and record the relevant movements of each point.

These points were taken with total station with which is calculated coordinates (north, east and altitude), so bring an adequate horizontal and vertical control of the wall.

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4.3 PROCESS OF OFFICE

Once the data taken in the field and encumbered in the internal memory of the station, it was transferred directly from the station to computer in order to reduce possible errors caused by the manipulation of data.

In the field book it was specified in great detail the approximate graph of work area, noting in it the sidewalk curbs directions, walls, corners, ledges, divisions, names of the properties, nomenclature, etc. In the field books of topography it was drawing as much information of terrain as possible, in order to guide in the adequate way the information processing.

With the field information on the computer, it was calculated the X and Y coordinate in specialized topographical software, from coordinate data generated arbitrarily. With listings of these items it were transferred to a drawing software (Autocad v-2007), in order to achieve the final plane, obtaining the cloud of points in autocad and then link them and in this way generate the drawing of the boundaries of the ground, edges of ways, constructions and other details. After that it was generated the contour of the workplace, and the point cloud taken.

Office work was carried out parallel with field work, establishing a daily control of the quality of the information collected by the committees, which in time allowed for the respective quality control, to minimize and correct a in a quick manner the possible inconsistencies, avoiding damming of final outlets.

4.4 STAFF

The work being carried out by professional surveyor duly registered with the National Professional Board of Surveying (Consejo Profesional de Topografía), with extensive experience in this type of project, who benefited from qualified personnel and properly calibrated equipment to ensure the accuracy of work.

The commission staff within field was as follows:

• Commission for lifting and leveling:

(01) Surveyor

(01) Draftsman (field)

(01) Chainman I

(01) Chainman II

• Office staff was as follows:

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(01) Calculator

(01) Drafters

Field commissions were coordinated by a surveyor engineer in with extensive experience in such projects, who maintained bound the works of field with those of office.

4.5 EQUIPMENT AND FEATURES

All equipment used in the project is duly skippered and have the respective calibration certificate (see Appendix 2). The equipment used in field by the committees was as follows:

• Electronic total station with internal field book.

• Automatic precision level

• Additional parts and accessories (tripods, look, pots, etc.).

• Vehicle

The office equipment was as follows

• Two computers.

• Printer

5 FOREST SURVEY

The Chief mission residence is environmentally characterized by having a wet cool microclimate, with low air and noise pollution (relative to the rest of the city). The soils observed in this region show good physical characteristics and moderate fertility.

5.1 PURPOSE AND SCOPE

The forest survey made in the house U.S. Embassy in order to describe the existing species and their status, consists of making field data and further analysis.

The present report provides an analysis of current state of tree cover in the sector assessed and has the highest probability of impact on the retaining wall that gives the fourth avenue and that is currently in geotechnical evaluation. With this forestry work to provide guidelines for analyzing the impact of tree component on the wall cracking and additionally make a proposal for forest management required for the proper maintenance sector home evaluated.

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5.2 METODOLOGY

For the implementation of forest compiling information are ahead two stages, the first is the characterization of vegetation by taking field data and the second is the diagnosis of the obtained information, from analysis of data from office.

5.2.1 Field phase

The activities developed to characterize the vegetation are the georeferencing of all individuals with height less than two feet and subsequent numbering and marking in the field.

This was followed by the identification of present species, based on the characteristics of trees, based on the experience of the professional attendance and support of specialized guides.

5.2.2 Phase office

To prepare the report began with the verification of the exact name of the scientific names, for that purpose use the support of the Key to the identification of general of trees, shrubs and palms1.

Office development in the systematization and analysis, with support from Excel to perform dynamic tables that serve to streamline the systematization of the data, based on these data identified the most common species.

Subsequently was placed in field the characterized individuals in the topographic plane which indicates the location of the species found in the park.

The methodology for the selection process of tree species and / or shrub to use in the landscape component, was based on the scheme proposed in the document entitled "Preliminary Design Complementation Green Handbook”.

The methodology of diagnosis and making recommendations are based on analysis of the physical characteristics of individuals and plant inventory, further evaluated the characteristics of existing species and their potential impact on the wall.

1 Mahecha, G. Clave para la identificación de géneros de árboles, arbustos y palmas, entrada por hojas, estípulas y exudaciones.

JBB – UDFJC. 2007

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5.3 RESULTS

Regarding the aspect of the present vegetation can be seen that the management silvicultural given to this House has been based on the planting of introduced species since several decades ago, hence the tree individuals, on its Most are in advanced stages of maturity, therefore some of Overturning danger they present.

5.3.1 Flower Identification

In the Green Zone were in total 143 individuals, including up cypress hedges and scattered trees throughout the house assessed, consisting of individual trees and shrubs, with heights greater than one meter, especially the individuals present are found as part of hedges or live fence of a few species generally are in good healthy and good management of pruning by managers. The following is a summary table of the species found in the House of the Embassy.

Common name Scientific name Family Total

Acacia Acacia decurrens Mimosaceae 11 Cherrytree Prunus serotina Rosaceae 1 Candpress Cupressus sp. Cupressaceae 100 Eucalandptus Eucalyptus globulus Myrtaceae 6 Eucalandptus Eucalyptus sp. Myrtaceae 1 Victorian box Pittosporum ondulatum Pittosporaceae 10 Pine Pinus radiata Pinnaceae 4 Ash Fraxinus chinenesis Oleaceae 10 General total 143

Table 4. Summary of existing species in the area inventoried

As shown both in graph, as in the table most of the species present in the house are bearing tree species introduced, although most of these are already naturalized, only one individual is Cherry, a species native.

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Acacia Cerezo Ciprés Eucalipto Eucalipto hoja redonda

Jazmin Pino candelabro

Urapán

Nombre común

N úm er o de In di vi du os Rosaceae

Pittosporaceae Pinnaceae Oleaceae Myrtaceae Mimosaceae Cupressaceae

Figure 5, Frecuence of arboreal species founden in the forest survey.

They come in all 8 species belonging to 7 families, the most common species in the garden is the cypress, because in most parts of hedges and live fence were shaped by this species, the frequency of species can be observed in the previous graph.

It is noted that the Acacias and jasmine are the two species that remain in terms of frequency of Cypress and then as you can see the cherry and the round leaf eucalyptus are presented with only one individual.

5.3.2 Diagnosis

To provide guidelines for the management of trees, the tables about the characteristics of the species in the survey conducted are presented below:

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Id COMMON NAME SCIENTIFIC NAME FAMILAND KNOWLEDGE GRADE F1 F2 F3 F4 F5 F6 F7 F8 F9 F10

1 Candpress Cupresus ssp. CUPRESACEAE 10 3 6 8 3 5 3 7 6 8 8

2 Acacia ** Acacia decurrens MIMOSACEAE 9 3 3 5 7 5 10 8 0 7 3

3 Victorian box Pittosporum undulatum Ventenat PITTOSPORACEAE 9 7 7 5 10 3 8 8 10 8 3

4 Ash ** Fraxinus chinensis OLEACEAE 10 7 8 7 5 4 6 7 7 9 8

5 Eucalandptus ** Eucalandptus globulus MANDRTACEAE 10 6 8 9 6 9 3 7 8 9 9

6 Pine ** Pinus radiata PINACEAE 10 8 8 7 6 8 5 3 7 8 7

7 Cherrytree * Prunus serotina ssp. ROSACEAE 10 10 9 6 3 3 3 9 8 8 10

Table 5. Summary of principal characteristics for existing species in the survey area, section 1 (source: IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”.).

Common Name Specie

F1 Contribution esthetic, cultural ysandmbolic.

F2 Contribution to welfare phandsic ypsandchological, to the recreation, to education yto the rest.

F3 Contribution o minimization of particle, wind, vectors yodors.

F4 Conformation of spaces ysub -spaces

F5 Valorization of the propertyprivate ythe public space

F6 Control of erosion, stabilization of slopes, basins protection ywaters bodies de ysoils improvement

F7 Provision de nicho, habitat yfood for the fauna

F8 Regulation climatic yweather control

F9 Capitation of carbon dioxide

(CO2)

F10 Contribution productive wood, firewood medicines, tinctures, cfrats fruits, forage, employyingress

Candpress 3 6 8 3 5 3 7 6 8 8

Acacia ** 3 3 5 7 5 10 8 0 7 3

Victorian box 7 7 5 10 3 8 8 10 8 3

Ash ** 7 8 7 5 4 6 7 7 9 8

Eucalandptus ** 6 8 9 6 9 3 7 8 9 9

Pine ** 8 8 7 6 8 5 3 7 8 7

Cherrytree * 10 9 6 3 3 3 9 8 8 10

Table 6. Summary of principal characteristics for existing species in the area inventoried, section 2 (Source: IDU, DAMA, JBB, 2002 “Complementación del Diseño Preliminar del Manual Verde”).

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N° Common Name Scientific Name

SURVIVAL CHARACTERISTICS MORPHOLOGICALS CHARACTERISTICS PHANDSIOLOGICALS OTHERS

CHARACTERISTICS

H u m id

Z on e

Su b

- H u m id

Z on e

Se m i-d ry

Z on e

D ry

Z on e

Root Sandstem tr ee tr u n k

Cup yFoliage

Pr o po rt io n al fe llin g

H ar di n es s

Re sis ta n ce o f m ai n te n an ce

M ed iu m g ro w th

Li fe

C an dc le

A ttr ac tio n F au n a

Pr ov en an ce

C h ar ac te ris tic s

Le ve l o f i n tr u siv en es s

D ia m et er

Fo rm

P…