CONSTRUCTION TECHNICAL SPECIFICATIONS COAST GUARD TRAINING ACADEMY IN CARTAGENAGENERAL BUILDING REGULATIONSIn the present specifications, greater emphasis is given on the characteristics and quality definition of finished construction work than on the necessary procedures description to obtain such results.

On the other hand, omission on detailed descriptions of construction procedure on most of the specifications reflects the basic supposition that the contractor knows construction practices.

1. The contractor shall provide all necessary tools, mechanical implements and vertical and horizontal transportation necessary for the proper work execution.

2. Temporary water, electricity and telephone facilities shall be at the contractor expense.

3. Elements and materials to be used on the construction shall be previously approved by The American Government or its representative by Submittaling technical cards, samples or laboratory results, 15 days calendar before the material is required on the work. Also, necessary tests may be ordered by the contractor to ensure that these tests are consistent with specifications.

4. Storage sites, camps and utilities shall be at contractor expense. Other temporary buildings considered necessary for the proper works development shall be also at contractor

expense. Their location shall be approved by The American Government or its representative.

5. As soon as the construction works are finished and prior to contract closed, the contractor shall remove all temporary constructions and excess material. The camps shall be thoroughly cleaned to the former conditions prior to undertaken construction works.

6. These specifications include ICONTEC, ACI Building Regulations, Seism resistant

Construction Regulations NSR-10 (Act 100 of 1997, Act 1229 of 2008 and resolution issued by Standing Advisory commission of Seism Resistant Construction regime from National Government) ASIM, CHEC, RAS 2000 Regulation of safe drinking water and basic quality, Technical Regulations of Electrical Installations (RETIE in Spanish) as pit as the manufacturer recommendations for installation and use of their products.

7. The contractor shall assume the protection and preservation of the works until it is definitely delivered or received by The American Government or its representative. If reparation is needed; it shall be at the contractor expense and in accordance with The American Government or its representative.

8. The prices shall include the cost of materials, labor, tools, equipment, transportation, quality control testing. Other elements and expenses necessary are also included for suitable execute of the contract as pit as indirect and financial costs.

9. If damages to third parties occur due to lack of foresight, careless or negligence, attributable to the contractor, this one shall be liable for any damage.

10. The American Government or its representative shall be demanding about works finishing and construction. Therefore, the contractor shall use high-quality materials and high- qualified labor.

The American Government or its representative shall reserve the right of approval or refuse of any work if they consider the work does not comply with the regulations issued on these specifications.

11.Helmet, gloves, glasses, foundations, belts or any other necessary element required by the

American Government or its representative shall be at the contractor expense.

During the work, first-aid elements shall be available and fulfill all the labor safe regulations included on Colombian Acts.

12. Trademarks, trade names or manufacturers stated on the drawings or specifications are set out as reference for high-quality of required material. The contractor may propose other

product names for American Government or its representative approve them, when these are considered equal or better in quality and comply with the regulations set out on these specifications. This shall not entail cost variation.

13. To start any operation, the contractor shall carry out tests clearly indicating the construction process to obtain the Government or representative approval.

14. Guard: facilities, stores, equipment, tools and other elements guard shall be provided by the contractor before and after their installation, until the work is finally received.

PARTICULAR WORK CONDITIONS LABORATORY TESTSThe contractor shall take responsibility for laboratory expenses. The laboratory is authorized in advance by The American Government or its representative. The contract drawn up to this operation shall include laboratory taking of samples. The results shall be delivered directly to the American Government or its representative. Its cost shall be included on indirect costs analysis.

CONSTRUCTION PROCEDURESProcedures execution on the works shall be subject to the contractor initiative in accordance with technical specifications stated on this solcitation for proposal comparison purposes and referred to sound engineering practice. The contractor shall be ultimately responsible for the application of such procedures which shall aim at obtain the best results in the completion of the work. However, The American Government or its representative shall, at any time, have the right of ordering changes to the used procedures for safe purposes and percentage of completion method, its coordination with the works of other contractors related to this one or for requiring the contractor to adjust to signed work contract.

UNAUTHORIZED OR DEFECTIVE WORKIf the work does not fulfill the specifications or The American Government or its representative instructions, shall be considered defective. So, the reparation and rebuilt shall be ordered. Therefore, it is considered refused; completed work shall not be measured or paid before necessary alignments and levels are given. The same is applied to any work unauthorized by The American Government or its representative and shall be corrected by THE CONTRACTOR.

THE CONTRACTOR shall not have right to receive any compensation for the refused work and demolition.

DAMAGE TO THE EXECUTED WORK AND THIRD PARTIESTHE CONTRACTOR shall take all responsibility for all the work to its completion and final approval. It shall also take responsibility for any damage caused to third parties, due to work construction and if damage is imputable to it. In this case, it shall repair the damage at its expense without implying changes to work planning either exception to such responsibilities or the agreed extension of the due date.

MATERIALSIn order to ensure a normal progress of the work and avoid lack of materials or any necessary high- quality elements, the contractor undertakes to provide on time all the required materials to the work construction and permanently keep a sufficient amount of it. The American Government or its representative shall reject material or used elements if they are nonconformance with regulations. The refused material shall be removed from the site and replaced by an approved material. The execution of the defective work shall be corrected in satisfaction without an extra payment required in favor of the contractor.

If verification of material general specifications in accordance with the regulations is required by The American Government or its representative, the contractor is required to carry out all necessary tests at its expense without implying an additional payment of the contract.

Once contract is awarded, if the American Government or its representative consider it necessary, shall demand a previous presentation of equipment supply schedule and materials by the constructor what shall be binding.

EQUIPMENTThe equipment to be used by the contractor, its depreciation and maintenance shall be at its expense, as pit as its operation, parking, insurance, etc, shall be at contractor expense. In this way, it shall keep, on the site, a sufficient amount of equipment in good condition and approved by the American Government or its representative. The purpose is to avoid delays or interruptions due to damage. Bad quality equipment, deficient maintenance or damage caused shall not be a cause to absolve contractual obligations.

The American Government or its representative may demand the removal from the site of any equipment or tool that they consider it is defective or not recommended to be used. The contractor shall replace, as soon as possible, the equipment to be removed by damage or maintenance in order not to delay the works.

SITE WORKERSAll of workers shall be directly contracted by the contractor itself. The workers do not acquire any labor links with the American Government or its representative. Therefore, salaries payments, compensation, bonuses and social benefits to those entitled to it shall be at the contractor expense, in accordance with agreed dead line.

SIGNALINGThe contractor is required to take all necessary cautions to prevent accidents occurring when the works included on the contract alter the normal vehicular and pedestrian flow. So, the contractor shall comply with the necessary construction general regulations.

The contractor shall place the signal and warnings to prevent accidents in daily and nocturnal time in accordance with amount, type, extension, shape, class, color and required distances, in accordance with the stated in former regulations or instructions given by the American Government or its representative.

Any accident caused by the lack of such as fences, barriers, warnings, guards and signals, shall be at the contractor expense. The American Government or its representative shall, at any time, order the partial or total work suspension if systemic breach by the contractor occurs to carry out the signaling requirement or instruction given in this respect.

When the works shall be done with a lack of natural lighting, the contractor shall supply proper electricity according to the type of work to be executed. If lighting is not enough, the American Government or its representative may order works suspension and the contractor shall not have the right to do any claim.

Dragged cord extensions, dangerously hanging or their cables bad-connected or insulated are. Fluorescent warnings and required flickering lights shall be placed to a proper distance from the work site.

The contractor shall take all the responsibility for the expenses generated by placement of signals and warnings and for the implementation of all necessary cautions for the prevention of accidents.

DISTINCTIVE INSIGNIAS OF PERSONNELThe contractor shall supply the personnel that work on the site with any distinctive insignia from the American Government or its representative and Naval base (badge and long denim dress). Use of protection helmet shall be mandatory for all the personnel.

THE CONTRACTOR shall supply, to the American Government and its representative, complete and correct information regarding the employed personnel amount in the work execution, its classification and affiliations to general health system and pension funds.

In addition to, the contractor shall be responsible for the permanent stating and execution of the occupational health program in accordance with the stated on current regulations. It shall take also the responsibility for risks arisen in the working environment and adopt the necessary cautions to reduce such risks (Decree 1295/94).

PREVENTION OF ACCIDENTS AND SAFETY MEASURESDuring the execution of the contract, the contractor shall, at any time, provide the necessary resources to ensure the hygiene, quality and security in every work used facility, employees, workers, subcontractors and goods.

The contractor shall impose to its employees, workers, subcontractors, providers and to every people related to the contract execution, the compliment of all conditions related to hygiene, security, quality, prevention of accidents and the current safe cautions, or the ones stated on this paper.

The contractor shall take the responsibility for all the accidents that suffered not only by his employees, workers, or subcontractors, but third parties too caused by negligence or careless by him. He shall also take the responsibility of ensuring that their personnel, employees as pit as workers or subcontractors take the cautions or safety measures necessary to prevent accidents. Therefore, all correspondent compensations shall be taken by the contractor.

During the contract execution, the contractor shall observe every authority regulations under its jurisdiction to be executed on the contract. The regulations are related to security, accidents

prevention, occupational disease, hygiene and quality and general regulations to be observed by public entities.

Prior to initiating the contract, the contractor shall prepare a complete schedule with all the caution measures to be taken during the works execution. These ones shall be undertaken to the American Government or its representative, which shall also order any other additional caution that considers necessary.

During the execution of the contract, the American Government or its representative shall demand to the contractor any additional measure that it considers convenient or necessary to ensure accidents prevention and he shall have to proceed accordingly. If the contractor does not satisfactorily comply with hygiene or safety requirements or with the American Government or its representative indications are not followed by him, there shall be a partial or total suspension of the work by the American Government or its representative. The contractor shall not have the right to demand a deadline extension. He shall take the penalties for this concept.

In case of imminent danger to people, works or goods, the American Government or its representative may omit the written notification and order corrective measures to be taken immediately. In these cases, the contractor shall not have the right to any recognition or compensation. The expenses necessary for the compliment of hygiene or safety measures or accidents prevention shall be taken by the contractor without any additional payment. Its value shall be included in indirect costs analysis or unit labor costs subheading, required on those cases to the proper offer comparison.

SITE CLEANING OR WORK PLACE CLEANINGDuring the development of the works, the contractor shall keep the site and surroundings in good condition. To this purpose, he shall properly remove waste, daily or as often as the American Government or its representative demands. He shall remove trash construction materials in such a way that it shall not arise, at any time, unpleasant or dangerous accumulation of garbage. When any part of the work is finished, the contractor shall remove, as soon as possible, all the equipment, temporary facilities and trash construction materials that shall not be used afterwards in the same site or around for the execution of other places of the work. He shall appropriately take all waste, trash construction materials generated by the works to the waste storage facility authorized by competent entity.

WORK DELIVERY AND RECEIVEThe contractor shall follow the instructions stated on the contract in accordance with the epigraphs titled Substantial Completion and Final Acceptance. The American Government or its representative shall give its approval or shall make the necessary observations for the contractor to satisfactorily complete the work. Likewise, the contractor is required to execute the final tests necessary to the works to be received.

FINAL CLEANING AND RESTURATIONAt the work completion, the contractor shall remove from surroundings installations, buildings, waste, trash construction materials and similar ones that he owns or have been used under his

guidance. Once the cleaning has been done, used extensions shall be restored in such a way that these ones shall have similar or better conditions than they used to have previously.

A. GENERAL BUILDING REGULATIONSThe Works shall be executed in accordance with the general building specifications stated on the Colombian Seism resistant building regulation NSR-10 (400 act of 1997, act 1229 of 2008 and resolution published by permanent commission of seism resistant construction by the National Government) and the particular specifications. The general specifications are part of the documents present on this contract. The particular specifications take precedence over the general ones. Where specific regulations are not stated, the materials, the equipment, the testes and supplied works by the contractor shall comply with the requirements of applicable regulations mentioned below:

NSR-10 The Colombian Seism Resistant building regulation.

INCONTEC (the Colombian technical standards institute)

ICPC (the Colombian institute of cement producers)

ASTM American Society for Testing and Materials

AISC American Institute of Steel Construction

ACI American Concrete Institute

RAS 2000 Local Health and Safety standards for drinking water.

RETILAP Technical Regulations for public lighting.

NEC National Electrical Code

The requirements here stated shall be seen as a basic guide, not a limitation for the work scope.

B. WORK DESCRIPTIONThe contractor shall work with the best techniques on Architecture and Engineering the necessary works for the construction of the Training Academy for Coastguard of the Colombian Navy.

The work scope included on these specifications is referred to the construction but not limited to construction of preliminaries works, drains and underground facilities, foundation, concrete structures, masonry,roofing,water andsanitation facilities, gas facilities, power and telecommunication facilities, metal carpentry, stuccos, flooring, painting, finishes, cleaning, exterior works and others. It includes labor supply, material supply, construction equipment supply and transportation of equipment to the work places. It includes the necessary tests to verify the acceptance and good quality of the materials or pre-manufactured elements with these materials. The work includes also the restitution of existing works that suffer damage due to the execution of stated works on this contract.

C. PARTICULAR SPECIFICATIONSThose works, which are not determined by the general specifications, shall take undertaken in whole in accordance with the particular specifications that are determined below. These specifications complete, replace or modify general specifications that may arise due to a big construction.

1.0. PRELIMINARIES CONSIDERATIONS Signs, Signals and safety measurements.This specification refers to the construction of Signs, signals and other necessary works on the places that indicate danger, to protect the work and pedestrian physical integrity. The works, the signs or signals shall be raised on the places indicated by US government or its representative and the Contractor shall supply the materials, labor and necessary equipment or its construction and maintenance while the work is being done.

Vicnity memorandumA document called Vicinty memorandum shall be done prior to work initiating where current condition of the surroundings is stated to the execution of the project. It shall include project extension, edifications, sidewalks, and existent streets. This shall go with a complete photographical register and a video. It shall be signed by Academy director or his representative and the contractor.

1.01.01.Campsiteandtemporaryfacilitiesforworkersandadministrativestaff. Extension=30.00 m2.The Contractor shall construct a camp using materials such as wood or galvanized sheet and cement-fiber tile, with their correspondent material storage places, workers dress rooms, office and bathrooms.

The location of this campsite shall be in a place coordinated by the contractor, the commander of the Academy and US government or its representative. The contractor shall be responsible for the safety of items left in this place and shall remove the campsite upon completion of the work, leaving the area under the same conditions as before the works began.

The eventual provision of any service by the end user to the contractor shall be of untied aid and eventual temporary suspension, failures or permanent suspension, shall not lead to any financial claim and / or delays or similar justification by the contractor. The contractor shall provide alternative means for these situations.. Camp extension: 30.00m2

1.01.02. Temporary enclosure in polypropylene fabric h=2:20m.It includes the works and necessary elements to isolate the extension where the construction shall be undertaken to prevent strange people from entering, at the rate of ate a good aspect and prevent possible accidents.

This shall be done with polypropylene fabric to a height of 2.20mts and shall be supported with wood or metal trusses to a distance not longer than 3.00mt and properly secured. The closure shall easily be removable to make easier materials entry.

1.01.03. Location and replantingThis operation refers to the supply of every means necessary to locate, set out and determine the stated levels on the Architectural and Structural Drawings. On the location of structural axes, the contractor shall accurately employ devices and mark permanently the axes that are part of the structure in such a way that later ensureing possible at any time is. The contractor shall locate all the axes, fixed points (if exist) and the levels in accordance with general references.

Clearing and GrubbingPrior to works of any type of construction, filling of earth or selected material, in natural terrain, strange materials such as waste, debris, and residual water shall be removed. These materials are located on the organic or vegetal layer that may be 20cm thickness; also a Grubbing shall be performed with the necessary depth to remove roots and other material that might alter the normal work development.

2.0. FOUNDATION2.01. EXCAVATION, FILLING AND REPLACEMENTS2.01.01. Manual excavation for foundation, including loading, removal, hauling, final disposal and shoring.This specification refers to the execution of the excavation required for the work, It includes labor supply, machinery, equipment, and necessary material for the proper and complete excavation execution in accordance with the lineaments, slope and levels indicated on the drawings and ordered by the American Government and its representative. In this item, it is included the necessary works for special treatments afterwards.

In general, the excavation pits sides shall be vertical faces consistent with the structure measuring, when the use of form does not need to be funded on the cement. When the use of those forms is necessary, the excavation pits shall be extended to 40cm outside the vertical concrete faces.

The contractor shall excavation pits procedures which are not dangerous for the slops stability and in that way particularly ensure that personnel life and integrity is protected on these activities. The excavation method to be used for the footings shall be approved by the American Government or its representative. However, the approval by this government does not remove, at any instance, the responsibility of the contractor.

The contractor shall supply the equipment and materials to keep, every temporary drainage and bombing systems necessary to drain superficial water from the flooding and excavated slops and keep them water free and protected from erosion at his expense. When the excavation has been completed to the specifics levels and slopes, the contractor shall report this to the American Government or its representative for the authorizing works continuation.

The contractor shall remove again by himself, the filling or concrete from any excavation that has been roofed with these materials without previous authorization by the American Government and its representative. When time between the excavation culmination and concrete placement has passed, filling, piping and others, excavation shall be interrupted at an upper level in 20 cms to the definite excavation depth. This shall be done to protect the land and get the structure founded on the ground without drilling the 20cm protectors that only shall be removed when the sub sequential working constructions are close to initiate.

When a landslide caused by negligence or inappropriate procedures by the contractor has occurred, excess material shallbe removed and the sub sequent additional filling shall be executed in accordance with to the correspondent specification and the cost shall be at the contractor expense. Also excessive excavation undertaken by his convieneance or negligence shall be at his expense, except the one ordered by the American Gorvenment or its representative, and or previously authorized on the drawings or included on the specifications. The excavated materials shall not be classified for the payment to be effected or any additional issue on the prices stated on

the work budget caused by the former ground class, characteristics or condition. Therefore, the excavation materials shall not be selected by its physical condition or any other cause that may occur such as excavation site, rain, routes, work problems because the water does not permit excavation or ensure soil survey.

Manual excavation of drainsIt refers to the excavations to install the PVC sanitary pipe, in accordance with layout on hydro- sanitary and rain water drawings. The trenchs shall be makes in accordance with the foundation and details drawings; excavation deep and width may vary, the trench width may be as comfortable as possible for a man to work (see chart No 1); for the 2, 3, 4,5 and 6 pipe respectively. The excavation sides shall be completely vertical. A 5 cm thickness layer shall be placed in order to prevent pipe to be bad placed and may be broken or fold. Afterwards, the pipe is placed.

TRENCH WIDTHS NOMINAL DIAMETER CHART NO 12.01.02. Mechanical excavation in regular material, including shoring, loading, removal, hauling, and payments to final disposal.It refers to earthworks in large and deep volumes necessary for the execution of foundations, binding beams, rigid beams, retaining walls and others; include the cutting, loading and removing of waste material to place them on sites for authorized final disposal which shall be placed by the contractor and approved by the American Government or its representative.

The excavations shall be carried out the sites indicated on the structural drawings and correspondent with the horizontal extensions and levels elevations (Ensure levels and extensions stated on the structural drawings) and authorized in accordance with by the American Government and its representative.

The excavations depth shall be left completely cleaned. The contractor shall execute at his expense every temporary works and necessary ones to drain and protect against flooding on the building extension and all of the works ordered by the American Government or its representative to be complied as indicated on these specifications.

The contractor shall use shoring in unstable or swamped ground. Also the contractor shall use shoring, when excavations have depths longer than one meter and the sides are vertical.

The constructor shall propose, to be considered by the American government or its representative, the most appropriate equipments for the operations to be undertake, These ones shall not cause unnecessary damage to the buildings and ensure the physical progress execution, in accordance with the work schedule that allows the development of following construction stages.

2.01.03. Piles excavation (d=40cm) includes the excavation, loading and removal of waste materials, equipment transportation, assembling and removal.The constructor shall take all the necessary cautions to prevent damage to existent structures and existent facilities in neighborhoods of job site. These cautions include, but are not limit, the selection of construction methods and procedures that avoid excessive socavation in tanks, monitoring and vibration control caused by the pile driving shirts and tank perforation.

Every damage and disturbance produced by this cause shall be assumed by the contractors and therefore, every technical action and any other ones to be undertaken to confront and solve a stated situation, shall be at his expense.

The foundation and piling excavations shall be undertaken in accordance with the dimensions and levels indicated on the drawings or ordered by the American Government or its representative.

Excavation method to be used shall be proposed by the contractor and shall be the most appropriate for the objectives proposed and the structural drawings stated. The contractor shall choose and use the system that he considers is appropriate to perfom this work. This one shall be submited to the American Government or its representative for approval.

The constructor shall take samples or core of rock indicated on the drawings or ordered by the American government or its representative to determine material characteristics which are underground pile excavation. The American government or its representative shall determine, once core or samples have been ensureed, the final excavation depth of the pit and shall approve further works.

The constructor shall provide the equipment in order to verify the dimension and alignments of the excavation of each piles. Such verification shall be done under supervision of the American Government or its representative. The pit final depth shall be measured after final cleaning has been completed. The pit excavation shall be cleaned until fifty per cent (50%) of the ground, has, as minimum, less than one centimeter (1cm), and no place on the ground has four centimeters of sediment. The pit cleaning shall be approved by the American Government or its representative.

2.01.04. Compacted filling in granular materialThis item refers to the supply, transportation, placement, and filling compacting on the surroundings or at the length of the concrete structures, pipes, filters, beddings, trenchs and wide spaces where drawings indicate or in accordance with what the American Government or its representative demands with selected materials. Every work that causes a further filling shall be ensureed and approved by the American Government or its representative prior to works related to filling to initiate.

The filling shall be placed according to level and slope indicated on the drawings and demanded by the American Government or its representative. Also it shall be placed on horizontal layers greater than 15cm in compacted thickness until reach levels or required elevations.

The ground where filling shall be placed, shall be grass-free, roots free and without organic vegetal soil, garbage and topsoil.

When the material requests it by conditions and type, water shall be added to get optimal wet for the compacting.

Every underground concrete shall be approved by the American Government or its representative prior to filling works initiation and it shall demand a removal of the filling material placed if this requirement has not been complied.

The filling works shall be initiated 8 days after that concrete has been placed.

The stated cost on this item shall include excavation on the borrow areas, crushed, classification, transportation, placement and compacting of the filling material. Also the labor, the operations, machinery and equipments necessary for the proper work execution are included.

Tests

Sieve analysis to the No. 200 sieve, a test per each 1000 m; methods: or ASTM D422 - 63 or AASHO T - 88 - 57. Liquid limit, plastic limit and plasticity index; a test per each 1000m2; methods - 59 ASTM D423 - 61T and T 01 - 54. Modified proctor to determine mximum dry density and optimal wet, a test per each 200m2;

methods: ASTM D1557 - 64T AASHO T 180 - 57. Moisture content during compacting: a test per each 300m2, use a quick and proper system. Field density test of the compacted soil; a test every 300m2; methods ASTM D 1556 - 64

AASHO T 147 - 54.The American Government or its representative may demand tests to be modified more often and also demand tests execution different from the one stated if it considers necessary.

The materials to be employed shall comply with the stated specifications on the soil survey. Stone aggregates

The materials used for construction granular sub-base may be natural rocks or material resulted from the crushing rock fragments or a combination.

Granulometry: it shall be adjusted to the zones indicated on the soil survey.

The zone to be employed shall be stated on the project documents or as indicated by TheAmerican Government or its representative.

In order to prevent segregation and ensure levels of density and resistance demanded on the present specification, the material provided by the constructor shall result in

granulometric curve uniform and very parallel to the limits of the authorized zone, with sudden interruptions on the upper part of the sieve to the lower adjacent part, etc.

The maximum nominal size of the aggregate to be used shall not exceed the half of the thickness of the compacted layer.

Consistence limits:

The material fraction from the granular sub-base that surpasses No40 sieve shall have a liquid limit lower than twenty five percent (25%) and a plasticity index lower to six percent (6%).Cleaning

The extension equivalent of the lowest fraction to the sieve No. 4 shall be at least twenty per cent (25%)

Resistance to abrasin.

The wear of material measured by Los Angeles machine test shall not be greater than fifty per cent (50%).

Bearing capacity

The compacted material to ninety five percent (95%) of modified Proctor shall have a CBR

equal or greater than twenty five per cent (25%). Tolerance for acceptance

The grade shall be performed to the cross sections, longitudinal profiles and lines indicated on the drawings. Distances between the longitudinal profiles of axis to about 1.5 cms if not systematically repeated.

The base thickness shall be verify by perforation means, spaced maximum every 50mts on the longitudinal profile of axis, shall not be lower than the projected distance (1.5cm).

The levels of the surface base finished shall not vary greater than 3cms from the project ones.

2.02. GENERAL SPECIFICATIONS FOR REINFORCED CONCRETES IN: FOUNDATION BEAMS, MACHINES ROOMS, COLUMN FOOTING, PILES, SQUARE COLUMNS, CIRCULAR COLUMNS, BEAMS, JOISTS AND BRACE BEAMS, AERIAL BEAMS, SLABS AND STAIRS.These specifications refer to the constructions of concretes, column footing in concrete, foundation beams, subfloor beams, concrete slabs, waterproof concretes, square columns, round columns, joist and brace beams, aerial beams, channel concrete, aerial slabs, stairs and any other concrete elements in accordance with the details included on the structural and architectural drawings, following the standards of Colombian construction seism resistant regulation NSR-10.

All structures shall be done with the dimensions included on the structural drawings, using metal or wooden forms in excellent conditions, straight and clean. It includes the supply of materials, preparation and mixes design, supply, removal and placement of forms, transportation. Also includes placement, finishing, curing, reparation, tools, resistance tests of used mixes and generally all the operations to execute the works in accordance with the drawings, specifications and indications given by the American Government or its representative. Every work related to the use of concrete, shall be mainly in accordance with the stipulations applicable to the Colombian code of seism-resistant constructions.

MaterialsEvery material shall be supplied by the contractor and in advance require, the American Government or its representative approval. During the works execution, the contractor shall provide, to the American government or its representative, the samples that this government demands from the materials as pit as the produced mix of concrete to ensure that its quality is preserved and in accordance with specifications. All of samples shall be taken under the supervision of the American Government or its representative. The required tests shall be assumed by the contractor.

CementThe cement to be used shall be Portland type I that conforms to ICONTEC and ASTM-C-150. The cement purchased by the contractor shall be from the same type and brand used for the mix design. The contractor shall provide proper means for the cement storage and protection against wet on roof sites and on wood platforms. Cement shall not be used if: it was stored for more than 2 months, which it has been partially harden or that has agglutinated cement lumps. Neither if the reroofed cement from refused bags. If a cement sample is refused by the American Government or its representative, all the cement lot from which the sample has been taken, shall be refused. The contractor shall remove it thoroughly from the work site and replace it by other with an accepted quality.

Additives

Concrete additives shall be used with the written approval by the American Government or its representative. In such case, the contractor shall submit the additives sufficiently prior to its use, samples of proposed additives as pit as the manufacturer specifications. The use of additives with calcium chloride or any other corrosive substances shall not be allowed on reinforced concrete elements. The cost of used additives shall be at the contractor expens and it is not allowed to use additives in order to correct deficiencies on the quality of materials, either on methods or the contractors equipment.

Aggregates

The aggregates used shall conform to ICONTEC 174 standard. The contractor shall obtain the aggregates from sources that shall be submitted to the approval by the American Government or its representative. It does not mean that the supply source is not part of the approval of every material taken from it. At least, 30 days prior to initiation of concrete elaboration, the contractor shall submit, to the approval of American Government or its representative, representative samples of every aggregate that desires to use.

a.- Fine aggregate

The fine aggregate shall be natural or elaborated or both and shall be free of dust, silts, alkalis, acids and organic or contaminated materials. The rocks that get desintegrated forming thin, flat and elongated particles, whatever processing equipment, shall not be approved to be used in fine aggregate production. Those particles whose dimension exceeds five times their minimal dimension, shall be considered as thin, flat and elongated.

b. - Coarse aggregate

This material shall be solid, strong and clean particles, obtained from the natural or crushed gravel or both. The aggregate shall be free of elonged or soft particles, organic matter, and other objectionable materials. Additionally the coarse aggregate shall meet the requirements as follow:

Percentage of slate, coals, crumbly materials shall be not more than 1% by weight.

Percentage in ferrous metal shall be not more than 0.3%.

Maximum dimension shall be not more than the fifth part in minimal concrete thickness, neither three quarters of minimal distance among reinforcing rods.

Material shall be sieved, washed, classified and submitted to the required processes to obtain an acceptable material. This aggregate shall be provided within the specified limits

of the following table:SieveSquare mesh (mm.)Percentage in weight(A)Percentage by weightpassing (B)

1 38=100 90

12510045 20

19100-9010 0

3/81055 305 0

No. 450 - 5=

c. cyclopean aggregate

The cyclopean aggregate shall be a broken stone of high-quality, with angular and cubic shape. This material tested in Los Angeles machine test, shall not have wear more than 50%. The ratio between large and small dimension shall not exceed 2:1. This aggregate shall have water saturation when added to concrete. Once aggregate has been placed, it shall be mixed with cement and washed sand, if it is necessary.

Water

Water use on concrete composition shall be fresh and clean, free of injurios amounts of acids, alkalis, oils, grease, silt, organic matter and any other substance that may reduce concrete resistance and durability. If water to be used is untreated, it shall produce mortar cylinders with compressive strength at 7 and 28 days similar to manufactured mortar cylinders in the same at the rate of s but with distilled water, in accordance with the ASTM C-109 standard Compresive strength of hydraulic cement mortars.

Concrete a.- Types

The contractor shall prepare different types of concrete required for the work, as indicated on the plan, in accordance with the table below:

TypeStrenght

(Kg./cm.)28 days (fc)(PSI)Maximum size(mm)Aggregate(inches)

D2814000512

H211300012

I762500321

K1402000321

L1051500321

b.- Mix design

Mix design to be used on the work shall be contractor responsibility and shall be done on every type of concrete, requested on these specifications and using the materials approved by the American Government or its representative, taking into account laboratory tests performed previusly. However, all mix design, modifications or revisions shall be submitted by approval of the American Government or its representative. Every time design is submitted for approval by the American Government or its representative, the contractor shall supply designed tests that reflect the greatest possible approximation to the concrete quality to be used on the work, including the ones from other tests results correspondent to each sample.

American Government or its representative previously approves materials resistance and strength on the laboratory. It does not mean either that concrete works shall be accepted or constructor be excerpted from fulfill all specifications and plan requirements.

Acceptance shall depend on proper execution of minimal resistance to compression according to concrete type. This resistance shall be determined in accordance with mixes added to works. Mix design includes the determination of mix kilograms amount to produce a cubical meter.

c.- Mix

Mix components at the rate of and aggregates grading shall be the result of the design approved in advance by the American design or its representative. Any changes in cement, aggregates, mix at the rate of or redesign require the authorization of the American Government or its representative. The concrete adding materials shall be added simultaneously on the mixer, except the water that shall be previously poured. Then, it shall be flown continuously while the solid materials are emptied. After all the components are into the mixer, concrete material shall be obtained on the mixer for a period not more than 25% of the mixing time. Mixing time shall not be, at any case, lower than 1.5minutes.

d.- Construction procedures

The contractor may elaborate and place concrete only under the American Government or its representative authorization.Previously, mix design, equipment, excavations, false work and forms, reinforcing steel, embedded elements properly installed and placement procedures of proposed concretes shall be received. No prior approval excerpts the contractor to his responsibility for any damage or failure neither to his obligation to finish the works in accordance with the drawings and specifications.

e.- Concrete placement

Concrete collocation, procedures, devices for transporting, pouring sequence shall be approved in advance by the American Government or its representative; natural or artificial site lighting, during placement shall be sufficient to reinforcing steel proper control, forms distributions and finished sides regularity and quality regulations.

The means employed for concrete transporting shall not cause segregation. It shall not be poured more than two times from the mixer downloading to its placement on the site. The mix shall not be placed prior to cure and within the 30 minutes after its preparation. If mix that does not follow these

requirements or has an excessive settlement, it shall not be incorporated to the work. It shall be removed at the contractor disposition and the American Government or its representative satisfaction. used equipment and concrete placement methods shall allow a good regulation on the amount added. Therefore, settlement or concrete impacts against the camber slips and reinforcing shall be avoided.

Concrete splitting is not allowed if exceedes in 1.20m on its placement, in order to prevent materials segregation. Different vibrators (if work requieres) shall be used to produce concrete hardening

15minutes after its placement. These ones shall not be placed on forms or reinforcing steel. Neither these ones shall be used to move concrete to a long distance that may cause segregation. During concrete placement, the vibrator shall be handled at regular periods and almost vertical position. These ones shall penetrate the upper part of subyacent layer to lighten towards the new one.

f.- Tests

During pouring operations, the contractor shall supply all concrete, mix samples and a set of 3 concrete cylinders as minimum. In addition, extra sets of cylinders shall be placed as determined by the American Government or its representative. The samples shall be taken from different kinds in accordance with NSR 10 Colombian Seism Resistant Construction Regulation. The contractor shall prepare, cure and test the samples to the compression at 7,14 and 28 days respectively. The result of the tests shall be the resistance average to the correspondent compression of three tested cylinders, except if a liter has been wrongly tested. In that case, the result shall be the average shall obtained from the two latter ones. The contractor shall make an extra cylinder to serve as prove at the required moment to be undertaken to a further test.

If concrete average resistance is lower than the stated, the American Government or its representative shall reject it, ordering the demolition and rebuilding at the contractor expense. Before concrete acceptance or rejection is considered to be deficient by the American Government or its representative, this one shall order that concrete structure core to be taken as many times as it considers necessary. The government may also order that loading tests be done in accordance with stated on the pertinent regulations. Operation costs shall be at the contractors expense. The concrete acceptance level shall be satisfactory if the average results are equal or greater than the stated resistance and if no cylinder has a resistance a lower than stated (f'c = 4.000 psi).

Wherever it is required, the concrete cores shall be calculated at least 2 in diameter, in order to calculate questioned concrete resistance in accordance with ASTM-C42 specification. At least 3 cores shall be drilled, and obtained from each concrete element or area that has been considered partially deficient.

g.- Curing

The concrete that has just been placed, shall be carefully protected from running water, heavy rain, pedestrian traffic and equipment, direct exposition to sunlight, vibrations and other damaging aspects. All concrete exposed sides shall be cured for a period not lower than 7 days, counted from the placement initiation. The formed surface exposed to sun light, shall be kept wet until they are removed from the forms to prevent water evaporation. Immediately after forms have been removed, they shall be cured using this procedure.

The contractor shall do the curing through sealing composers, authorized in advance by the

American Government or its representative.

h.- Finishes

The finished sides shall be smooth, solid, soft, scales free, with no pressures, holes, stains, either any other defects or irregularities. These ones shall also follow all the requirements stated for finishing in accordance with stated on this epigraph or on the drawings. The irregularities are classified in rough or soft. The soft ones are the ones which are protrusions or rough cavities caused by wrong placement, movement or forms defects, and are determined by direct measure. The other irregularities which are considered soft, shall be measured by using a metal ruler or similar for curved sides. These ones shall be measured in accordance with concrete surface inclination, regarding the model ruler border and if it firmly touches the surface. The concrete surface finishes shall be executed by professional staff and monitored by the American Government or its representative. All sides exposed to sunlight or rains, which are seen across on the drawings,

1% shall have slopes, except if the drawings, the American Government or its representative indicate something different.

i.- Reparations

The concrete reparations shall be done by qualified staff under the American Government or its representative control. After 24 hours concrete placement and after the forms removing time, the contractor shall correct all imperfections on the concrete. If sides suffer damage, have load bearing concretes, breaches or significant empty spaces, they shall be chopped until withdraw thoroughly the imperfect concrete. This shall be done according to the American Government or its representative. The space left shall be filled with concrete or dry-consistent mortar to the required lines. The reparations shall be at the contractor expense If the American Government or its representative consider that there is excessive concrete, cavities or similar, the work may be rejected and shall be demolished. The prosecutor shall demand defective surfaces to be polished with Emeril or similar.

j. Waterproof concrete

Waterproofing operations on walls, floors foundation slabs or other structure sides exposed to pressure or hydrostatic sub-pressure shall be done using an integral water proofer, dissolved in concrete mixing water from the same quality and type approved by the American Government or its representative. All done in accordance with the manufacturer indications, using plastocrete type or similar.

k.- Leasing

After concrete works completion and before final acceptance by the American Government or its representative, the contractor shall withdraw false works and scaffolds from the site. The ground and garbage shall be taken out and damped to the authorized places outside the Academy.

l.- False Works or Forms

The contractor shall design, provide and place all the forms necessary for concrete confining and shaping according to the parameters stated on the structural drawings and ordered by the American Government and its representative.

If the concrete exceeds the stated limits, it shall be corrected or destroyed and replaced by the contractor at his expense. The camber slips shall be constructed in such a way that the sides of the

finished concrete have a uniform surface. The use of defective forms shall not be allowed though showing admissible tolerances to the extensions and finishes.

The tolerances are stated only for taking into account unnoticed or not frequent irregularities. The contractor shall not use again the same form if this one has been properly cleaned and repaired to obtain the specific finishes and revised and approved by the American Government and its representative.

The minimum admitted periods, after the concrete placement for the forms removing and false work, shall be determined by the American Government or its representative according to the concrete, work and weather characteristics. At any case, concrete with additives shall be removed before 24 hours. None of the respective authorizations of the American Government or its representative shall excerpt the contractor from his responsibility for the work quality and stability or for any defect or damage that may arise, especially if it is attributable to the excessive efforts in the structure caused by inappropriate procedures of forms removing.

m.- Facilities and contractors equipment

The equipment for concrete works is compound by the mixer, scale for aggregate weighting, devices or vehicles for transporting and placing aggregates and mixture, vibrators and any other necessary elements.

All the equipment shall be perfectly functioning. Any element that does not work properly, affecting work functioning or quality, shall be repaired or replaced by the contractor. The contractor shall provide with additional reserving mixers, vibarators and other elements to ensureoperation continuity, avoiding cold joints on the concrete structure.

All of the equipment and tools for mixing, placement and concrete consolidation regarding type, design, capacity and mechanical conditions, shall be approved by the American Government or its representative. The mixers shall be in a design that produces a homogenous mix, with uniform characteristics.

Vibrators to be used for concrete consolidation shall have internal reference that has 7000 r.p.m. as minimal frequency. Also it shall have the ability of visibly affecting the mix with a2.5cm in settlement to a minimal distance of 45cm from the vibrator. The scales used to weight the components of the mixer shall be the same handle type or springless quadrants and the contractor shall calibrate when demanded by the American Government or its representative.

n.- Elements embedded on the concrete

Elements embedded on the concrete such as anchorage rods, pipes, vent ducts shall be anchored fixedly on the sites indicated on the drawings. It is necessary to clean those elements to remove stainless, painting, scales and any other matter that obstruct good adherence between the metal and concrete. Once the cleaning is done, before pouring the concrete, it shall be painted with grout.

2.02.01. Lean concrete f'c =1.500 psi 5 cms in thickness

Supply, transporting and placement of lean concrete of f'c = 1500 psi that is applied to excavations bottom in order to protect foundation base. Lean concrete also protects mending against any kind of contamination or natural condition disturbance or ground excavations. Concrete layer 5cm in thickness.

2.02.02. f'c = 4.000 psi Concrete footingSupply, transporting and placement of f'c = 4000 psi concrete for the execution of concrete footing, which shall have 3settlement as maximum for foundations on sites determined on the Structural Project and the drawings. It includes: mix design, preparation, tests, internal transportation, placement, protection and curing. Mending is not included.

2.02.03. Foundation joisters in f'c = 4.000 psi reinforced concreteSupply, transporting and placement of reinforced concrete of f'c = 4000 psi for foundation beams, which shall have 3settlement as maximum if it is placed on sites indicated on the Structural Project and on the drawings. It includes: mix design, preparation, tests, internal transportation, placement, protection and curing. Mending is not included.

2.02.04. Subfloor beams in f'c = 4.000 psi reinforced concreteSupply, transporting and placement of f'c = 4000 psi reinforced concrete for subfloor beams in those sites indicated on the the Structural project and the drawings. It includes: mix design, forms placement, preparation, tests, internal transportation, placement, protection and curing. Mending is not included.

2.02.05. Subfloor slabs in f'c = 4.000 psi t = 0.05 mts reinforced concreteExecution of slabs on fc = 4000 psi reinforced concrete, with 0,05 m average thickness. These ones shall be installed as beams roof, joist and bracing beams in accordance with the constructing system designed for the project (foundation slabs). It shall be taken into account the coordination between Architectural drawings and structural drawings.

This work includes concrete supply, transporting and placement. It includes: mix design, preparation, tests, internal transportation, placement, protection, curing and all necessary additives to ensure a proper MANAGEMENT. Mending is not included.

2.02.06. f'c = 4.000 psi waterproof reinforced concrete for machines roomSupply, transporting and placement of waterproof f'c = 4000 psi reinforced concrete for machines room, in those sites indicated on the Structural project and the drawings. It includes: mix design, preparation, tests, internal transportation, placement, protection and curing. Mending is not included. Forms and camber slips included.

Fort the tank , it is proposed to execute a SIKA PVC O22 joint tape stated on the item 2.03.09-

2.04.09. The tape is placed parametrically central and perpendicular towards the joint in such a way that the tape embedded on the concrete on the first stage and the second one, is equal or lower than the concrete roof. In this way, tape has approximately the same thick than the concrete section.

3.01.01. f'c = 4.000 psi concrete square columns on. Visible finishesExecution of columns on square section made by f'c = 4.000 psi concrete with visible finish. It shall be used Tablemac Smooth-board form or similar, super T or similar, according to location and extensions indicated on Architectural drawings and the Structural drawings. Concrete color shall be approved by the American Government or its representative. It includes: mix design, preparation, tests, internal transportation, placement, protection and curing.

3.01.02. f'c = 4.000 psi. Concrete circular columns on. Visible finishingExecution of columns on circular section on f'c = 4.000 psi concrete with visible finishing. It shall be used Tablemac Smooth-board form or similar, super T or similar, in accordance with location and extensions indicated on Architectural drawings and the Structural drawings. Concrete color shall be approved by the American Government or its representative. It includes: mix design, preparation, tests, internal transportation, placement, protection and curing.

3.01.03. f'c = 4.000 psi concrete beams for second floorExecution of aerial elements, made up with beams into subfloor lighted slabs, on f'c = 4.000 psi reinforced concrete. This is done in accordance with location and extensions indicated on Architectural drawings and on the Structural drawings. These elements are contrimmed on the panels and subfloor forms.

3.01.04. f'c = 4.000 psi concrete beams and bracing beams for second floorExecution of aerial elements, made up with beams and aerial bracing beams into subfloor lighted slabs, on f'c = 4.000 psi reinforced concrete. In accordance with location and extensions expressed on Architectural drawings and on the Structural drawings. These elements are contrimmed on the panels and subfloor forms.

3.01.05. Beams and aerial beams on f'c = 4.000 psi. concrete roofExecution of aerial elements, made up with beams and aerial beams into subfloor lighted slabs, on f'c = 4.000 psi reinforced concrete, in accordance with location and extensions indicated on Architectural drawings and on the Structural drawings. These elements are contrimmed on the panels and subfloor forms.

3.01.06. f'c = 4.000 psi Drain beamExecution of f'c = 4.000 psi reinforced concrete upper drain beams, in accordance with location and extensions shown on Architectural and Structural drawings. These elements receive roofs or slopes correspondent to inclined roof, used for rain water collection.

3.02.02. Light subfloor slabs h=0.35 mts (no lower layer) on f'c = 4.000 psi concrete. Beams, beams or braces are included.

Execution of slabs or aerial light slabs 0.35 mts in thickness, with a 5cms upper layer, no lower layer, on f'c = 4.000 psi reinforced concrete, for subfloor, following the indications on Structural and Architectural Drawings. The inner finish shall have a smooth board form finish. The panel used for lightening shall be made up with bamboo or similar.

3.02.03. f'c = 4.000 psi concrete flat solid slabs e = 0.10 mtsExecution of f'c = 4.000 psi reinforced concrete solid slabs h = 0.10 mts and characteristics indicated on Structural and Architectural Drawings. Form modulation for lower finish shall be approved by the American Government or its representative.

3.03.01. f'c = 4.000 psi. Reinforced concrete aerial stairs. Visible finishingExecution of f'c = 4.000 psi reinforced concrete aerial stairs, melted following instructions on Structural Drawings and Architectural Drawings. These ones shall be incrusted again, balanced and equilibrated following detailed specific drawings and stated finishes. The final finish for lower drawings and aluminum roofs shall be the visible concrete.

4.02.01. 0.10 x 0.20 mts Concrete small columns. Masonry confining on concrete slabs.Execution of 0.10 x 0.20 mts small columns on fc = 3.000 psi Concrete. They are melted on the site for masonry confining on concrete slabs, in accordance with location and extensions expressed on Structural and Architectural Drawings.

Concrete piles

The piles of block guardcoast are 11 meters in length (according to the structural drawings). It shall comply with the pile entry to existing coral rock stratum, which is approximately 4mts from the ground surface according to the soils survey.

Concrete strength: 24.5MPa 245Kg / cm ^ 2 3.500psi

Reinforcing steel strength: 420MPa 4.200Kg / cm ^ 2

Materials

Concrete.

The concrete used in the piles construction have features identified in the designs, accepting a maximum size in the aggregate up to 32 mm. These ones shall have workability enough to ensure absolute continuity in placement, even removing the casing, with a liquid consistency.

Mending.

The steel used in construction mending baskets is according to the specifications indicated in this specification.

The transverse mending is subject to the longitudinal, for tiding or welding.

Long tethers may be received In piles up to ten meters (10 m), the mending shall be welded to each other, at least one (1) of two (2) points of contact as in its length.

Steel sheetings.

The structural steel used in the manufacture of the casing sheetings shall be AASHTO M-270, # 36. Concrete stilts

Suspension or grout.

The grout used in the drilling process shall be a mineral suspension, with sufficient viscosity and gel-like characteristics to transport the excavated material to a suitable sieving system. The percentage and density of the material used in the suspension shall be sufficient to maintain the

excavation stability and allow the concrete to pour. An acceptable range of values of the physical properties of the suspension is given below:

PROPERTIESRANGETESTING METHOD

PRIOR TOSUSPENSON INMERSEAT CASTING TIME

Density (Kg/M3)1030 11001030 1100Sludge weighting

Viscosity28 4528 45Marsh Funnel

Ph8 - 118 - 11Ph measuring

instrument

Tabla 1. Suspension characteristics notes: The values of density 30 kg/m3 increase in saltwater.

The Marsh cone corresponds to the 152 mm inlet model and 4.76 mm outlet, funnel 305 mm in height and output 50 mm in height.

If sand removal is required, this content shall not exceed 4% by volume, at any point of the pit

drilling, according to the test established by the American Petroleum Institute.

The viscosity and pH tests shall be performed during the cavity excavation, to establish a consistent work pattern.

Before placing concrete mending pile, samples shall be taken from the bottom at intervals not exceeding 3 meters to the total height of the mineral grout.

Any highly contaminated grout accumulated in the pile bottom shall be removed. The mineral grout shall be added immediately before concrete pile placement according to the specified requirements.

Other suspensions containing polymers, polymers with bentonite additives or other clays can be used as sludge stabilization based on the experience of previous cases. If suspensions are used in similar or worse geotechnical conditions or in the case of excavation of full scale test in situ, these ones shall meet the specifications in Chart 1.

Equipment

The equipment required shall depend on the construction system adopted, but basically it includes cranes, drills, augers, buckets, bilge, sludge trap equipment, sampling equipment, drain pipes, casing pipes, concrete pumps, and generally any other necessary equipment for the proper execution of the work.

Execution of the work.

Good time prior to work starts, the constructor shall submit to the U.S. Government or its representative, for review and approval, working drawings that include the following main points:

List of proposed equipment.

Details of the construction sequence.

Details of the methods of digging pits. Details of the proposed method for mixing and recirculating the slurry desarenar, if required.

Details of the cleaning methods.

Placement Details mending.

Details of placement, curing and protection of concrete.

Details of the required load tests or special tests.

Additional information required by the U.S. Government or its representative.

The manufacturer cannot initiate construction of pre-dug piles while working drawings have not been approved by the U.S. Government or its representative.

Such approval shall not exerpt him to his responsability for the results obtained from the use of such drawings.

Protection of existing structures.

The constructor shall take all necessary cautions to prevent damage to structures and facilities in the neighbouring work area. These cautions include, though not limited, the construction selection, methods and procedures that prevent excessive scour in digging pits, monitoring and control of vibrations from the sheetings driving and pit drilling or blasting, in case they occur.

All damages and pains that occur for this reason shall be his sole and absolute responsibility. Therefore, all technical and any other measures to be implemented to address and resolve the situation in question shall be paid by the constructor.

Excavation method.

Any foundations excavation where exist pre-dug or drilled piles, shall be completed before piles construction starts. When installing piles, these ones shall be pre-excavated together with the embankments placement. The piles shall be constructed after backfilling.

They shall keep a log of each pile drilling, where there is an appropriate depth and quality of the excavated site, plus the income received during the process.

Excavations for foundation piles and flares shall be made of accordance with the size and elevations shown on the drawings and ordered by the U.S. Government or its representative. The manufacturer may select and use the system as it sees fit to do the job, which shall be submitted to the approval of the U.S. Government or its representative.

Erecting sheetings.

The sheetings shall be metallic, smooth, airtight and sufficiently strong to support the management enforcement and erecting, as well as the pressure exerted by the concrete and the surrounding ground material. The outer diameter of the sheetings shall not be less than the specified pile size.

The sheetings, which may be temporary or permanent, shall be erected by a suitable method, using equipment previously approved by the U.S. Government or its representative. In the case of permanent sheeting and at excavation end, the sheeting shall be cut to the indicated elevation.

Sheetings shall be removed if temporary concrete is manageable. Generally, the temporary withdrawal of the sheetings shall not be started until the concrete is not at or above the ground surface. It allows the use of a rotational movement of the sleeve exerting upwards pressure for easy removal or attachment using a vibratory method. The sheeting removal shall be done slowly, at a

uniform rate, parallel to a pile drive shaft. A specific head shall be maintained on sheetings bottom sufficient to resist the hydrostatic pressure exerted by the water or drilling fluid that is outside the sheetings.

Suspension or grout

When you need to use the suspension level, it shall be maintained at a convenient height to prevent the undermining of the excavation. The mineral grout shall be premixed with fresh water and allow sufficient hydration time, before inserting it into the well.

When project documents indicate, adequate tanks shall be provided for the suspension, but in this case does not allow suspension dug wells, unless the U.S. Government or its representative authorized in writing. Required measures shall be taken such as agitation, circulation and adjustment of the suspension properties, in order to avoid curing in the excavation hole.

Before placing concrete pile, it is important to take suspension samples from the bottom and at intervals not exceeding three meters (3.0 m) over the entire suspension height. Any highly contaminated slurry accumulated in the bottom pit, shall be eliminated.

The mineral suspension shall follow the specification requirements, immediately before placing the concrete pile.

Excavation inspection

The Constructor shall provide equipment for ensureing the dimensions and alignment of each pile excavation. Such verification shall be executed under the direction of the American government or its representative. The final pit depth shall be measured after completing the final cleaning.

The pitbore excavation shall be cleaned until fifty percent (50%) of the base. It shall be at least less than a centimeter (1.0 inch) of sediment and in any place of the base, more than four inches (4.0 cm) of sediment. Excavation leasing shall be approved by the U.S. Government or its representative.

Construction and placement of basket reinforcing

The basket includes steel mending indicated on the drawings, added to the reinforcing rods in the basket and spacers, centralizers and other necessary accessories fully assembled. It is placed as a unit immediately after the American government or its representative inspects and accepts the excavation, and before the

Concrete is placed.

Reinforcing steel on the excavation bottom shall be tided and supported within the tolerances allowed, until the concrete supports it.

When concrete is placed by pipe discharging, it shall use temporary anchorage devices to prevent the basket from lifting during concrete placement. Concrete spacers or other noncorrosive separation device, approved, shall be used at intervals not exceeding one and a half meters (1.5 m) along the shaft. It ensures concentric rack position into the excavation . When longitudinal reinforcing bars exceed twenty-five millimeters (25 mm) (No.8), the spacing shall be no more than three meters (3.0 m).

Placement, curing and concrete protection.

Concrete shall be placed as soon as possible after placing the reinforcing steel basket with all its attachments.

The Constructor shall aware that at no time the concrete drop height is more than 1.50 m. If the concrete is placed under water or suspension, it shall be placed through a drain tube (tube Tremie) or by pumping it. Tremie tube is maintained at all times with the tip buried at least two meters (2 m) in the fresh concrete. Thus, it is ensured contaminated concrete delivery to the surface for removal.

Concrete placement shall be continuous until the pit upper bound and when it is filled until there is evidence of good quality concrete.

Not be accepted under any circumstances, interruptions, motivating the rejection of the pile, if this happens.

For pits with diameters of less than two meters and forty centimeters (2.40 m), the time from the start of concrete placement to completion shall not exceed two (2) hours. For pits eaqual in diameter or greater, the concrete placement rate shall not be less than nine meters (9.0m) from the pit height for each two (2) hours period.

The concrete mix shall be designed in such a way that its plastic states to maintain the limit during two (2) hours placement.

The concrete pile shall be vibrated or manipulated with a rod, to a five meters (5.0 m) depth of below ground surface, except where the soft or suspended material remains in the excavation can be mixed with concrete.

After placement, transiently exposed pile surfaces shall be cured. No construction operations shall be executed at least forty-eight (48) hours after concrete placement to avoid movement of the ground adjacent to the pile. Only a moderate vibration shall be allowed.

Parts of piles exposed to water bodies shall be protected against the action of water, leaving the camber slip at least seven (7) days after concrete placement.

Test piles flared.

Test piles shall be done. These tests are used to determine whether the methods, equipment and procedures used by the Constructor are enough to achieve piles excavation that complies with the drawings and specifications requirements.

The constructor shall ensure methods and equipment as needed, at any time, during the drilling of holes for test piles, in order to successfully complete the excavation.

The location of the test pile shall be indicated by the U.S. Government or its representative.

The diameter and depth of holes test piles shall be the same as the definite pre-dug piles shown on the drawings or ordered by the U.S. Government or its representative. The holes are filled with plain

concrete, in the same way that the definite piles unless if the American Government or representative indicates a different material filler.

Construction tolerances.

For pre-dug piles construction the following construction tolerances shall be accepted:

The horizontal displacement of the pre-dug piles from the position indicated in the project drawings shall not exceed seven and a half inches (7.5 cm) in any direction on the projected top pile level.

The vertical alignment of the pile excavation shall not vary by more than projected alignment in two centimeters per meter (2 cm / m) in depth.

After placing the concrete, the mending basket top shall not be more than six inches (15 cm) above nor more than seven and a half inches (7.5 cm) below the projected position.

When using sheetings, outer diameter shall not be less than the pile diameter indicated on the drawings. Otherwise, the minimum diameter of the drilled pits shall be equal to the diameter shown in the drawings for diameters of two feet (60 cm) or less and up to two and a half inches (2.5 cm) less than said diameter, for larger diameter pits two feet (60cm).

The support piles area flared shall be excavated at least equal to the projected support area. Any other flared cylinder indicated dimension, may vary to fit the equipment used, subject to approval by the U.S. Government or its representative.

The pit top level shall not exceed one-inch (2.5 cm) of the indicated level. The bottom of the pit excavation shall be normal to the axis thereof, with a maximum deviation of six centimeters per meter (6 cm / m) diameter hole.

Do not accept any pile that does not comply with the stated tolerances. In this case, the Constructor shall submit for approval by the U.S. Government or its representative, and corrective methods can not continue with the construction of the pile, until the respective approval.

3.04. REINFORCING STEELa.- Description

This description is about the supply, transporting, storage, shaping and placement of reinforcing steel for concrete works, following structural drawings.

b.- Materials

Round smooth or corrugated rods that follow ICONTEC NTC 2289 standard. The rods shall be counted by inch number. The reinforcing rods and electric-welded meshes shall have national manufacture and national trademark and quality certified by the manufacturer. Steel rods that have resistances obtained by cold treatments shall not be used. All reinforcing rods shall follow the specifications content on ICONTEC NTC 2289 Standard.

c.- Supply and storage

Every reinforcing steel delivery that arrives the site or place where their shaping is executed shall be identified with logos that indicate manufacture, quality and steel bar codes correspondent to the lot. The rods shall be transported and stored on an organized way. These ones shall not be placed

on the floor. Instead, they shall be grouped and properly marked in accordance with the format, shape and reinforcing type.

d.- Cutting Chart

The contractor shall draw a cutting chart before the rods are cut and folded, according to the drawings and structural designs. When the drawings indicate removal, the contractor shall analyze it before iron is shaped. If any discrepancy or error arises, the contractor shall write a notification for the American Government or its representative.

e.- Folding

The rods shall be folded in cold conditions in accordance with the structural design drawings. The minimum folding radius, anchorage hooks extensions and constructing procedures shall be in accordance with specifications content on ICONTEC NTC 2289 standard.

f.- Splices

The reinforcing rods shall be supplied in accordance with the lengths on the cutting list. Fitting shall be allowed only if lengths indicated on the list are taken into account. Moreover, fitting indicated on the drawings or approved by the American Government or its representative shall be allowed.

The splices or parallel rods overlappings that suffer a traction process and on the same structural element, shall be alternated as possible. If drawings indicate different lengths, these ones shall not be lower than 36diameters and shall be in accordance with the specifications content on INCONTEC NTC 2289 standard. For reinforcing bars tiding, black wire shall be used. Welding shall never be used.

g.- Replacements

Rods shall not be replaced by rods from different diameter, unless if it is approved by the American

Government or its representative. h.- Reinforcing placement

Prior to their placement, rods shall not have rust, painting, grease or any other strange material. The reinforcing rods shall be placed on its proper position following the drawings and fixed properly for preventing moving during its placement and concrete vibration.

The specific distances between the rod and the form shall remain on position by using pre- manufactured mortar blocks, spacers, metal shaft hangers or any other devices used to prevent moving approved by the American Government or its representative.

Rock or wooden blocks shall not be used to keep reinforcing on position. The American Government or its representative shall approve reinforcing on all structure parts, prior to concrete placement. Reinforcing rods shall be placed in such a way that the distance shall be at least 2.5m (1) between these ones and the anchorage BOLTS or embedded metal elements. Minimal coatings content on ICONTEC 2289 or on the NSR-10 standard shall be taken into account , unless if the American Government or its representative gives a different indication.

Steel weight shall be calculated regarding the bar lenghts indicated on the drawings and unit theoritical weights that are indicated as follows:

bar designationnumberDiameter in inchesDiameter in inches(mm)Nominal weightkg/m

26.350.249

33/89.500.560

412.700.994

55/815.901.552

619.102.235

77/822.203.042

8125.403.973

Joints

Joints shall be placed on the sites indicated on the drawings or by the American Government or its representative on the work. Joints on cold conditions shall not be allowed. The construction joints, contraction and expansion shall be in accordance with number, position and shape on the construction drawings. This do not imply cost changes or modifications on the deadline.

Construction joints

These are the surfaces where the concrete shall be placed on or against and that have acquired a rigidity grave, in such a way than the concrete, once cured, may not be added monolithically. The construction joints shall have horizontal flat surfaces, vertical ones or inclination demanded by the American Government or its representative. The joints that are not on the drawings, but necessary, shall be constructed and located in such a way that the structure, used for their installation, shall not be weakened. Such installation shall be approved in advance by the American Government or its representative.

Contraction Joints

The contraction joints indicated on the drawings shall be constructed forming the concrete on one of the joint side. The joint shall be allowed to set before placing the concrete on its adjacent side. Unless if the construction joints are supposed to be injected with grout, enough material layer shall be added on one of the joint sides to concrete surfaces. This shall be done before placing adjacent concrete to prevent adherence.

The expansion joints with filling shall be built in accordance with indications content on the drawings or considerations given the American Government or its representative. If sliding from a surface to other arises on the expansion joints, an additive shall be applied to prevent adherence.

REINFORCING STEEL FOR FOUNDATION BEAMS, MACHINE ROOM, FOOTINGS, PILES, SQUARE COLUMNS, CIRCULAR COLUMNS, BEAMS, BEAMS AND BRACING BEAMS, AERIAL BEAMS, SLABS AND STAIRS.

Reinforcing steel PDR-60 f'y = 4.200 kg/cm2 (420Mpa) including shaping, cutting, installation.

This specification includes the supply, transporting, cutting, folding, shaping and fy = 4.200 kg/cm2 (240 Mpa.) steel bars placement. It is for elements on reinforced concrete for structures and other works where this element is required, according to the structural designs, and details indicated on

the drawings, indications on Colombian Design Standards and Seism-resistant construction. The mending and placement shall follow ICONTEC 22898 Standard or NSR-10.

3.04.05. fy = 4.200 kg / cm2 (500 mpa) electrowelded mesh.

Supply, transporting, biding and placement of f'y = 4.200 kg/cm2 (420 Mpa),electro welded mesh for aerial slabs. It includes panel-shaped manufactured, compound by granulations or smooth high resistant steel wire, set on a octagonal position and electro welded on all the connecting points. These meshes shall be placed in accordance with the indications content on the Structural Drawings. These ones shall be used as concrete structures mendings (underground tanks, ramps and subfloor slabs), in accordance with the specific extensions content on the structural and reference drawings. The meshes shall follow the NTC 5806 (ASTM A1064); (NTC 2310) standards.

Meshes shall be bound using black wire to protect meshes against substances such as oils, greases, dust, mud, etc., which may affect concrete adherence. It is necessary to ensure if the meshes placed correspond with the cutting structural elements. Also it shall be ensureed if they follow the specifications on the structural drawings regarding separations, diameters, length, overlapping, sizes and specific resistances. Therefore, these shall be placed on its site 24 hours prior to the concrete pouring and for this pouring to be verified and approved by the American government or its representative.

Reinforcing Granulations for foundation slabs (3,5 mm, 4 mm, 6 mm y 7,5 mm)

This specification includes the supply, transporting, cuttig, floding, shaping and instalatiion of fy =

4.200 kg/cm2 (240 Mpa) steel bars for elements on reinforced concrete and other works that require this element, in accordance with the structural designs and details stated on the drawings, indications on the drawings, indications on Colombian Design Standards and Seism-resistant construction. The mending and placement shall follow INCONTEC 22898 Standard or NSR-10.

3.05. METAL STRUCTURES3.05.01. Supply, manufacture, transporting, assembling, and sea environment painting (base and finishing)

Manufacture, supply, installation and painting of architectural metal elements such as belts, anchors, turnbuckles, and other used for the Project Modules roofs. These shall be done on Acesco styles or similar, in accordance with structural and Architectural Drawings. It includes anticorrosive and finish paint in a color to be determined by the American Government or its representative. The constructor shall present the workshop drawing for approval by the American Government or its representative.

Delivery, storage and control

The manufactured sections and the components shall be sent completely identified in accordance with the workshop drawings. They shall be stored in accordance with the manufacturer indications, under low-wet level, properly protected against environment and construction operations.

Manufacture

Materials that have a proper size and thickness shall be used to produce solidness,

necessary durability on the finished product. Extension indicated or accepted on the Structural Drawings shall be manufactured, using previsions on the drawings regarding its manufacture and support.

For the execution of visible areas, smooth and materials with no perforations, threading marks, rolling marks, etc.

Defects on the surface shall be removed using abrasive or reconstructive procedures before starting cleaning activities and treatments prior to painting. All surface defects shall be removed on abrasive or reconstructive processes prior to star cleaning operations and treatments prior to painting.

Extensions

Extensions on the work shall be monitored allowing necessary adjustments on the facility. This shall be done in cases when the metal elements installations preceed other works such as concrete supports or similar.

Edges and basils

Alignments and element levels shall be polished on areas of metallic work exposed. All the joints among elements on round pipe shall be fish-mouth type.

4.0. WALLS ON MASONRYThis specification includes the walls to be constructed on faade and into the edification. For that purpose, the bricks or blocks to be employed on the work shall be complete, have straight edges and without chips. Their quality shall be uniform and undertaken to the American Government or its representative before used on the work. Their faces shall be rectangular and their extensions shall have a tolerance about 0.50cm related to their nominal extensions. The bricks or blocks used shall follow NTC 4205 Standard.

MORTAR 1:4

Mortar shall be compound by a cement part and four parts of extension (1:4) to join bricks or blocks regarding the case.

Note: the mixture and treatment standards for the work are also applied for the concretes in accordance with the cement storage and extension, and mixture procedure, transporting and handling on the placement site.

Semiwashed sand Extension

The extensin to be used for the mortar fissure preparation for brick or block shall the most known type of extension used for this purpose. Also it is necessary the extension to be on the area and that has a low level of CLAYS. This one shall be ensureed and approved by the American Government or its representative before placed on the mix.

The mortar to be required for the block or brick join shall be made for immediate use, rejecting the mix with a manufacture period greater than 30minutes.

The dimensions shall not contain substances such as acid, greases, plant debris or high amount of clay or mineral salts that obstruct adherence or negatively influence on the hardening process.

All the bricks or blocks shall be moistened prior to the placement to ensure that mortar fi