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Edifcio das Naes Unidas para os PALOP'S
TABLE OF CONTENTS TOC - Page 1 of 1AN10064-0100D-TOC-40A2-GE-01 REV 0
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TABLE OF CONTENTS
A. CONTRACT FORMS AND CONDITIONS
A1. TENDER CONDITIONS AND PROCEDURES
A1.1 INSTRUCTIONS TO TENDERERS
A1.2 PRICING OF TENDER DOCUMENTS
A1.3 SUBMISSION OF TENDERS
A1.4 TENDER EXAMINATION AND ACCEPTANCE
A1.5 SCHEDULES
A2. TENDER AND CONTRACT FORMS
A2.1 FORM OF TENDER
A2.2 FORM OF AGREEMENT
A2.3 FORM OF BANK GUARANTEE (TENDER SECURITY)
A2.4 FORM OF BANK GUARANTEE (PERFORMANCE SECURITY)
A3. CONDITIONS OF CONTRACT
B. SPECIFICATION
40:0 GENERAL
40:1 PARTICULAR REQUIREMENTS
40:2 BORING AND SAMPLING
40:3 IN SITU TESTING
40:4 LABORATORY TESTING
C. METHOD OF MEASUREMENT
D. BILL OF QUANTITIES
E. DRAWINGS
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A. CONTRACT FORMS AND CONDITIONS
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A1. TENDER CONDITIONS AND PROCEDURES
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INSTRUCTIONS TO TENDERERS A1.1 - Page 1 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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A1.1 INSTRUCTIONS TO TENDERERS
1001 PURPOSE OF TENDER: to obtain a favourable offer from qualified contractors for
the execution and completion, in accordance with the Tender Documents, of the
Subsurface Investigation for the purpose of the design of foundations, excavation supportsand paving works for the Regional Centre of Information of PALOP in Luanda, Angola.
1005 TENDER DOCUMENTS: provided to Tenderer are as follows:
A1- Tender Conditions and Procedures
A2- Tender and Contract Forms
A3- Conditions of Contract
B- Specification
C- Method of Measurement
D- Bill of Quantities
E- Tender Drawing(s)
Addenda, circular letters and faxes, if any, issued by the Engineer prior to the
latest date fixed for the delivery of Tenders.
1010 SETS OF TENDER DOCUMENTS: one set of Tender Documents is issued to each
Tenderer
1015 DETAILS TO BE CONFIDENTIAL: Tenderer shall treat the Tender Documents as
private and confidential (save in so far as may be necessary for the purpose hereof) and
shall not publish or disclose the same or any particulars thereof in any trade or technical
paper or elsewhere. The Tender Documents shall not be used for any purpose other than
that for which they are intended.
1020 SIGN, DATE AND COMPLETE in ink, one set of the Tender Documents using
block letters. The signature must be that of a principal of the firm or a person legally
authorised for the purpose.
1025 QUERIES, AMBIGUITIES AND DISCREPANCIES in or between Tender
Documents must be referred to the Engineer by fax or in writing, not later than 3 days
before the date fixed for delivery of Tenders. Clarification by the Engineer will be
distributed to all Tenderers in the form of an addendum, circular letter, or fax.
1030 QUALIFICATION OF TENDER: the Tender is to be strictly in accordance with the
Tender Conditions and Tender Documents. Any qualification of a Tender or alteration to
the Tender Documents shall be deemed to be null and void.
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INSTRUCTIONS TO TENDERERS A1.1 - Page 2 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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The Tender must be submitted solely on the basis of the documents provided and shall be
free of any qualifications. If the Tenderer wishes to submit an alternative offer to the
Employer for consideration, such offer shall be additional to and completely separate from
this Tender and shall be submitted as a separate set of Tender Documents.
1035 SUBMITTALS: the Tenderer shall evidence his understanding, capability and
proposals for the execution and completion of the Works, and to this effect shall produce
and submit as an integral part of his Tender, the following information:
(a) Programme of Works in a bar-chart form indicating clearly : the main
activities with order of procedure, progress, duration and completion; key
dates including Commencement on Site, Interim Completion and Final
Completion, time allocated for review of reports by the Engineer, together
with a statement describing and explaining methods and strategy to be
adopted.
(b) A detailed listing of the Contractors Equipment proposed to be used in
carrying out the Works (in accordance to Schedule No. 1)
(c) A detailed listing of the key personnel proposed to be employed in
managing, supervising and carrying out the Works (in accordance to
Schedule No. 2)
1040 PARTIAL TENDER: Tender fully for the whole of the Works as described. A partialTender will not be considered.
1055 COST OF TENDER: no reimbursement whatsoever will be made for any cost,
expense or loss which may be incurred by the Tenderer in the preparation and submission
of his Tender.
1060 SITE VISIT: the Tenderer or any of his servants or agents will be granted permission
by the Employer to enter the Site for the purpose of inspection in connection with the
Tender. The Tenderer by entering the Site will be deemed to have released and
indemnified the Employer and his servants or agents from and against all liability in respect
of personal injury (whether fatal or otherwise), loss of or damage to property and any other
loss, damage, cost and expense whatsoever and howsoever caused (whether or not by the
act or neglect of the Employer) which but for the exercise of such permission would not
have arisen.
1065 PERIOD OF VALIDITY: the Tender shall remain valid and irrevocable for a period
of 60 days from the latest date fixed for delivery of Tenders.
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PRICING OF TENDER DOCUMENTS A1.2 - Page 1 of 1AN11064-0100D-CON-40A3-GE-01 REV A
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A1.2 PRICING OF TENDER DOCUMENTS
2001 UNPRICED ITEMS: costs relating to items which are not priced shall be deemed to
have been included elsewhere in the Tender.
2005 CURRENCY: All unit rates and prices shall be expressed in U.S. Dollars.
2010 ERRORS FOUND IN CHECKING TENDER PRICE: before accepting any Tender
accompanied by a Bill of Quantities, the Tenderers pricing will be checked arithmetically
and to ascertain that amounts have been correctly transferred from one part of the Tender
Documents to another. If any errors are found the difference between the Tender Price and
the corrected Tender Price, will be adjusted either by amending individual unit rates by
agreement, or by a percentage calculated upon the total amount of such errors in relation to
the Tender Price, so that the original Tender Price remains unaltered.
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SUBMISSION OF TENDERS A1.3 - Page 1 of 1AN11064-0100D-CON-40A3-GE-01 REV 0
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A1.3 SUBMISSION OF TENDERS
3001 DELIVERY OF TENDERS: validated Tender Documents are to be delivered in a
sealed envelope addressed to:
Dar Al-Handasah Consultants (Shair & Partners)
141 Av. Che Guevara,
P.O. Box: 2584
Luanda, Angola
Tel: +244 222 447 461
Fax: +244 222 449 882
E-mail: [email protected]
The envelope is to bear no marking other than as follows:
CONFIDENTIAL
DO NOT OPEN WITHOUT AUTHORITY
TENDER DOCUMENTS FOR THE SUBSURFACE INVESTIGATION
FOR THE REGIONAL CENTRE OF INFORMATION OF PALOP
Dar Al-Handasah Consultants (Shair & Partners)141 Av. Che Guevara,
P.O. Box: 2584
CONTRACT NO. {
Luanda, Angola
TO BE FILLED BY DAR LUANDA
}
3005 DISPATCH TENDER DOCUMENTS and validating data to arrive at the address
stated not later than twelve noon on the date given in the Letter of Invitation or such other
date as may be officially notified in writing under the hand of the Employer or Engineer to
all Tenderers. Tenders received after this time and date will not be considered.
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TENDER EXAMINATION AND ACCEPTANCE A1.4 - Page 1 of 1AN11064-0100D-CON-40A3-GE-01 REV 0
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A1.4 TENDER EXAMINATION AND ACCEPTANCE
4001 EXAMINATION : Tender Documents will be opened and examined by a committee
appointed by the Engineer. Prices will not be made public.
4005 CLARIFICATION BY TENDERER: a Tenderer may be required to prepare and
furnish clarification for any item in the Tender Documents. Failure to comply with such a
request may result in disqualification.
4010 ACCEPTANCE OR REJECTION: no undertaking is given or implied to accept the
lowest or any Tender and no reason will be assigned for the acceptance or rejection of any
Tender.
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SCHEDULES A1.5 - Page 1 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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A1.5 SCHEDULES
SCHEDULE No. 1
CONTRACTOR'S EQUIPMENT
-----------------------------------------------------------------------------------------------------------------------------
The Tenderer shall enter in this Schedule under appropriate headings all major items
including drilling rods, bits, split spoons, core barrel, laboratory testing equipment etc.
of Contractor's Equipment which he proposes to bring on to the Site for the execution
of the Works, or to be used in the laboratory for performance of laboratory tests in
accordance to the following form.
Calibration certificate should be provided where applicable.
(Use separate or additional sheets)
-----------------------------------------------------------------------------------------------------------------------------Description Characteristics: Quantity Estimated
(Type, Size, Capacity, Duration
Model, Make, Power Rating, etc. on Site
Year) (Days)
----------------------------------------------------------------------------------------------------------------------------
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SCHEDULES A1.5 - Page 2 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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SCHEDULE No. 2
KEY PERSONNEL
-----------------------------------------------------------------------------------------------------------------------------
The Tenderer shall enter in this Schedule names and duration of the key personnel thathe proposes to employ at Head Office, Laboratory and on Site to manage, supervise
and carry out the Works. together with their qualifications, experience, positions held
and nationality.
(Use separate or additional sheets)-----------------------------------------------------------------------------------------------------------------------------
Designation Name Qualifications, Summary of Years
and and Present Experience with the
Nationality Occupation Firm
-----------------------------------------------------------------------------------------------------------------------------
Head Office
Owner/Partner/
Director in Charge
Other Key Staff
(List Below)
Laboratory
Laboratory Engineer
Laboratory Technician
Other Key Staff
(List Below)
Site Office
Site Engineer / Geologist
Driller(s)
Other Key Staff
(List Below)
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A2. TENDER AND CONTRACT FORMS
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FORM OF TENDER A2.1 - Page 1 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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A2.1 FORM OF TENDER
FOR
SUBSURFACE INVESTIGATION
To: Dar Al-Handasah Consultants (Shair & Partners), Angola
1. Having examined the Site and the Tender and Contract Documents for the above-
named works, we, the undersigned, offer to execute and complete the whole of the
Works comprised by the Contract for the Tender Price of
............................................................... US
Dollars (US$ ...........) or such other sum as may become payable in
accordance with the Tender and Contract Documents.
2. We undertake, if our Tender is accepted, to commence the Works within five (5)
days after receipt of the Engineer's order to commence and to complete the Works
and submit all reports in accordance with Clause 24 of the Conditions of Contract.
3. We agree to abide by this Tender for a period of 60 days from the date hereof and it
may be accepted by you at any time before the expiry of that period.
4. We agree that any alteration to the Tender Documents or any qualification of the
Tender contained in a separate letter accompanying our Tender or otherwise, will be
deemed to be null and void unless also accompanied by an unqualified Tender.
5. We undertake, if our Tender is accepted, to enter into and execute the Form of
Agreement as and when requested so to do.
6. Unless and until an Agreement is prepared and executed, this Tender, together with
your written acceptance thereof, shall constitute a binding agreement between us.
7. We understand that you are not bound to accept the lowest nor any Tender you may
receive.
8. We unconditionally accept that no reimbursement whatsoever will be made for anycosts, expense or loss which we may have incurred in the preparation and
submission of our Tender.
9. We attach as an integral part of our Tender for approval and acceptance, the
following information:
(i) Proposed Programme of Works(ii) List of Contractors Equipment (in accordance with Schedule No. 1)(iii) List of Key Personnel (in accordance with Schedule No. 2)
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FORM OF TENDER A2.1 - Page 2 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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Signed & sealed .........................................................
In the Capacity of .......................................................
Duly authorised to sign tenders for and on behalf of:
....................................................................................
....................................................................................
Address .......................................................................
....................................................................................
Date .............................................................................
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FORM OF AGREEMENT A2.2 - Page 1 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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SPECIMEN
A2.2 FORM OF AGREEMENT
FOR
SUBSURFACE INVESTIGATION
THIS AGREEMENT is made on the .................. day of ...... 2011
between Dar Al-Handasah Consultants (Shair & Partners) (hereinafter called 'the
Employer') of the one part and .................................... (hereinafter
called 'the Contractor') of the other part.
WHEREAS the Employer has accepted a Tender from the Contractor for the execution and
completion of the above-named Works, this Agreement witnesses as follows:
1. In this Agreement words and expressions shall have the same meanings as are
respectively assigned to them in the Conditions of Contract hereinafter referred to.
2. The following documents shall be deemed to form the whole of the Contract
Documents and shall be read and construed as part of this Agreement:
the Letter of Acceptance
the Tender
the Conditions of Contractthe Specification
the Methods of Measurement
the Bill of Quantities
the Drawings
3. In consideration of the payments to be made by the Employer to the Contractor, the
Contractor hereby covenants to execute and complete the Works comprised by the
Contract in strict conformity with the provisions of the Contract.
4. In consideration of the execution and completion of the Works by the Contractor,
the Employer hereby covenants to pay the Contractor the Contract Price of
..U.S.Dollars (U.S.$..),
or such other sum as may become payable in accordance with the provisions of the
Contract, at the times and in the manner prescribed by the Contract.
IN WITNESS whereof the parties hereto have signed below on the date first written above.
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FORM OF AGREEMENT A2.2 - Page 2 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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EMPLOYER
Dar Al-Handasah Consultants (Shair & Partners)
Signed ...............................................................
Name .................................................................
CONTRACTOR
Signed ..............................................................
Name ................................................................
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FORM OF BANK GUARANTEE (TENDER SECURITY) A2.3 - Page 1 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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SPECIMEN
A2.3 FORM OF BANK GUARANTEE
(TENDER SECURITY)
FOR
THE TENDER OF
SUBSURFACE INVESTIGATION
WHEREAS .........................................................................................................................
(hereinafter called the Tenderer) has submitted his Tender dated ........................................
day of ...................... 2011 for the . (hereinafter called the
Tender).
BY THIS GUARANTEE we ...............................................................................................
of .................................................................................................................................
having our registered office at ..........................................................................................
.....................................................................................................................................
(hereinafter called the Bank) are bound unto .. (hereinafter
called the Employer) in the sum of ..
US Dollars (US$...) for which payment well and truly to be made to the said
Employer the Bank binds itself, its successors and assigns by these presents.
SEALED with the Common Seal of the Bank this ..................... day of ................. 2011
THE CONDITIONS of this obligation are:
(1) if the Tenderer withdraws his tender during the period of tender validity stated in
the Form of Tender; or
(2) if the Tenderer, having been notified of the acceptance of his tender by the
Employer during the period of tender validity,
a) fails or refuses to execute the Form of Agreement, or
b) fails or refuses to furnish the Performance Security,
we undertake to pay to the Employer the above amount upon receipt of his first written
demand, without the Employer having to substantiate his demand, provided that in his
demand the Employer will note that the amount claimed by him is due to him as a result of
the occurrence of one or both of the two conditions, specifying the occurred condition or
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FORM OF BANK GUARANTEE (TENDER SECURITY) A2.3 - Page 2 of 2AN11064-0100D-CON-40A3-GE-01 REV 0
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conditions.
This Guarantee will remain in force up to and including the date 60 days after the closing
date for submission of tenders or as extended by the Employer at any time prior to this
date, notice of which extension to the Bank being hereby waived, and any demand in
respect thereof should reach the Bank not later than the above date.
Signature for the Bank .........................................................................................................
In the capacity of .................................................................................................................
Signature of Witness ...........................................................................................................
Name ..................................................................................................................................
Address ...............................................................................................................................
............................................................................................................................................
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A3. CONDITIONS OF CONTRACT
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CONDITIONS OF CONTRACT A3 - Page 1 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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A3. CONDITIONS OF CONTRACT
FOR
SUBSURFACE INVESTIGATION
1. DEFINITIONS
In the Contract, the following words shall have the meaning assigned to them by
this Clause:
(a) 'Employer' means: (TO BE FILLED BY DAR LUANDA)
{Name}
{Street / Building}
{PO. Box: }
{City/Capital, Country}
{Tel: }
{Fax: }
{E-mail: (if any}
(b) 'Engineer' means:
Dar Al-Handasah Consultants (Shair & Partners)141 Av. Che Guevara,
P.O. Box: 2584
Luanda, Angola
Tel: +244 222 447 461
Fax: +244 222 449 882
E-mail: [email protected]
(b) 'Contractor' means the person or firm or company whose Tender has been
accepted by the Employer.
(c) 'Sub-contractor' means any person or firm or company to whom a part of the
Works has, with the consent of the Engineer, been sub-contracted by the
Contractor.
(d) 'Contract' means the Contract Documents listed in the Form of Agreement
and such further documents as may be expressly incorporated in the Letter
of Acceptance.
(e) 'Letter of Acceptance' means the formal acceptance by the Employer of the
Contractor's Tender
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CONDITIONS OF CONTRACT A3 - Page 2 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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(f) Works' means the Subsurface Investigation of the Site as described in
paragraph (h) of this Clause for the proposed Regional Centre of
Information of Palop and comprising geotechnical investigation of surface
and sub-surface conditions.
(g) 'Site' means the area or areas where the Works are to be carried out. The
geographic location of the Site is close to the TPA Production Studios &
Emission Center with the plot limits as defined on the Drawings..
(h) 'Contract Price' means the amount Tender Price stated in the Contractor's
Tender, subject to such adjustment as may be necessary in accordance with
the Contract.
(i) 'Equipment' means all plant, machinery, apparatus, appliances and things of
whatsoever nature necessarily required for the proper performance,
execution and completion of the Works, whether owned, hired, or leased by
the Contractor or any Sub-contractor.
(j) 'day' means calendar day.
2. DOCUMENTS
The Contract Documents are complementary and are to be taken as mutually
explanatory of one another; what is required by any one of them shall be deemed to
be as binding as if required by all.
3. LANGUAGE OF THE CONTRACT
The language of the Contract is English. All reports, drawings and other written
matters shall be in English.
4. LAW OF THE CONTRACT
The Contract is subject to and shall be construed according to Laws of State of
Angola.
5. EXTENT OF CONTRACT
The Contract comprises the execution and completion of the Works and, except in
so far as the Contract otherwise provides, the supply of all approved professionally
skilled personnel, superintendence, labour, materials, equipment, plant and
everything whether of a temporary or permanent nature required for such execution
and completion, so far as the necessity for providing the same is specified in or
reasonably to be inferred from the Contract.
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CONDITIONS OF CONTRACT A3 - Page 3 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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6. CONTRACT AGREEMENT
The Contractor shall, if called upon so to do, enter into and execute a Contract
Agreement in the form annexed to these Conditions with such modification as maybe necessary.
CONTRACTOR'S GENERAL OBLIGATIONS
7. RESPONSIBILITY
The Contractor shall take full responsibility for execution and completion of the
Works in accordance with the Contract and for the adequacy, stability and safety of
all site operations and methods of working, the suitability of Equipment and
methods of sampling, testing and any other matters in connection with the Works.
8. KNOWLEDGE OF WORKS AND SITE CONDITIONS
The Contractor acknowledges and shall be deemed, prior to submitting his Tender,
to have thoroughly studied all Documents relating to the Contract, carried out an
inspection and examination of the Site and its surroundings and obtained all
information necessary to acquire a full and complete understanding, knowledge and
evaluation of the nature and scope of the Works and the provisions and prevailingconditions applicable to their performance, and have satisfied himself and made due
allowance in his Tender, as to:
(a) the category, quality and quantity of Equipment and labor that is necessarily
required to execute and complete the Works in a timely manner, including
without limitation: all technical data, local operating conditions and other
requirements concerning and applicable to the use of such Equipment.
(b) the form and nature of the Site, including without limitation: means of
access, hydrological, climatic and meteorological conditions;
(c) any statutes, orders, regulations, bye-laws or other constraints or restrictions
applicable to the Site or Works;
(d) all risks, contingencies and all other circumstances which may influence or
affect the undertaking, execution and completion of the Works.
9. WORK TO BE TO SATISFACTION OF ENGINEER
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CONDITIONS OF CONTRACT A3 - Page 4 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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The Contractor shall execute and complete the Works in strict accordance with the
Contract to the satisfaction of the Engineer and shall comply with and adhere
strictly to the Engineer's instructions and directions on any matter (whether
mentioned in the Contract or not) touching on or concerning the Works.
10. INSTRUCTIONS
The Contractor shall take instructions and directions from the Engineer only. The
Engineer's written decision on any question of the interpretation of the Specification
and the performance of the work shall be final and subject only to the provisions of
Clause 38, the parties shall be bound by such decisions.
11. REVISED PROGRAMME OF WORKS
If at any time it should appear to the Engineer that the Contractors actual progress
of the Works does not conform to the Programme of Works attached to his accepted
Tender, the Contractor shall produce at the request of the Engineer, a revised
Programme of Works showing such modifications as are necessary to ensure
completion of the Works within the Time for Completion.
12. CONTRACTORS EQUIPMENT
The Contractor shall not, except with the express permission and approval of the
Engineer, omit, modify, substitute or remove any item or quantity of ContractorsEquipment listed in the Schedule attached to his accepted Tender.
13. KEY PERSONNEL
The Contractor shall not, except with the express permission and approval of the
Engineer, omit, modify, substitute or remove any Key Personnel listed in the
Schedule attached to his accepted Tender.
14. STATUTORY OBLIGATIONS, FEES AND CHARGES
The Contractor shall comply with all obligations and submit all notices required by
any statute, order, regulation or bye-law applicable to the Works and shall pay all
fees and charges in respect of the Works legally payable by him.
15. EXISTING UTILITIES AND SERVICES
The Contractor is deemed to be fully acquainted with the location of all existing
utilities and services on and in the vicinity of the Site and is solely responsible for
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CONDITIONS OF CONTRACT A3 - Page 5 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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any interruption or damage caused to such utilities and services by his site
operations. All damage must be reported immediately to the Engineer and the
relevant Authority. The Contractor shall pay for any repair costs and associated
charges imposed by any relevant Authority for rectification of any interruption or
damage so caused.
16. CONTRACTOR'S REPRESENTATIVE
The Contractor shall at all times keep on the Site a qualified representative who is
competent to supervise the Works and to receive notices on behalf of the Contractor
and act upon the instructions from the Engineer.
17. GUARANTEE
The Contractor guarantees that the Works shall be undertaken and performed in
accordance with currently accepted geotechnical investigation practices and
standards and that all work shall be executed and completed in compliance with the
requirements thereof.
18. REMOVAL OF IMPROPER RESOURCES
The Contractor shall upon the order of the Engineer promptly remove from the Site
any unfit or unsuitable resource, including but not necessarily limited to personnel,
workmen, materials and Equipment, which in the opinion of the Engineer is not fitfor the function or purpose intended. The Contractor shall promptly replace such
resource to the approval of the Engineer and shall bear all costs incurred by such
removal and replacement.
19. RE-EXECUTION OF WORK AND REPLACEMENT OF UNFIT WORK
The Contractor shall upon the order of the Engineer promptly abandon any work
which in the opinion of the Engineer is not fit for the purpose intended. The
Contractor shall re-execute all such work as the Engineer deems necessary in
conformity with the approved mode and method of working to replace the work
which was declared unfit for its intended purpose and he shall bear all costs
incurred by such re-execution and replacement.
20. SUB-CONTRACTING
Except for engaging the services of a public or an approved commercial laboratory
the Contractor shall not sub-contract the Works or any part thereof without the prior
consent and approval of the Engineer.
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CONDITIONS OF CONTRACT A3 - Page 6 of 11AN11064-0100D-CON-40A3-GE-01REV 0
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21. HEALTH AND SAFETY
Without prejudice to the Contractor's responsibility to provide for the safety and
security of the Contractor's personnel, the Contractor shall comply with all and any
health and safety regulations imposed by Authorities having jurisdiction.
The Contractor shall immediately report to the Engineer any accidents, involving
death or injury to Contractor's personnel or any other person, and any loss or
damage to the Works or Equipment or any other property.
22. PERFORMANCE SECURITY
Not Applicable
COMMENCEMENT, PROGRESS AND COMPLETION
23. COMMENCEMENT OF WORKS
The Contractor shall commence the Works on Site within five (5) days after the
receipt by him of an order in writing to this effect from the Engineer and shall
proceed with the same with due expedition and without delay.
24. TIME FOR COMPLETION
The Contractor shall complete the whole of the Works within Twenty Five (25)
}
days (herein referred to as Time for Completion) from the date of the Engineer's
order to commence pursuant to Clause 23, or such extended time as may be allowed
by the Engineer.
The Contractor shall provide and maintain sufficient Equipment and Personnel on
Site in order to complete all sitework operations including tests-pits, boreholes,
sampling, insitu testing and the like within five (5)
days from the date of the
Engineer's order to commence, or such extended time as may be allowed by the
Engineer.
25. RESTRICTION ON WORKING HOURS
Subject to any provision to the contrary contained in the Contract, none of the
Works shall, save as hereinafter provided, be carried on during the night or on
locally recognised days of rest without the consent of the Engineer, except when
work is unavoidable or absolutely necessary for the saving of life or property or for
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the safety of the Works, in which case the Contractor shall immediately advise the
Engineer.
26. EXTENSION OF TIME
If the amount or nature of any extra or additional work or any instruction by the
Engineer should be such as to fairly entitle the Contractor to an extension of time
for completion of the Works, the Engineer shall determine the amount of such
extension and notify the Contractor accordingly.
27. LIQUIDATED DAMAGES
In the event that the whole of Works are not completed within the time stated in
Clause 24 or such extended time as may be allowed by the Engineer, then the
Contractor shall pay to the Employer as liquidated damages for such default and not
as a penalty, one percent (1%) of the Contract Price for every day or part of a day
which shall elapse, between the time for completion and the date of completion
stated in the Certificate of Completion issued by the Engineer pursuant to Clause
29. Liquidated damage for such default shall not exceed fifteen percent (15%) of
the Total Contract Price.
28. SUSPENSION OF WORK
The Contractor shall on the written order of the Engineer suspend progress of theWorks or any part thereof for such time or times as the Engineer may consider
necessary to ensure that the Works may be executed properly. The Engineer shall
certify the cost of such suspension (if any) and allow such extension of time as in
his opinion shall be fair and proper.
29. COMPLETION OF WORKS
When the Engineer is satisfied that all Works on Site have been completed,
including in situ tests, reinstatement of ground and clearance of the Site, he will
issue a Certificate of Interim Completion. Thereafter, when the Engineer is satisfied
that the Contractor has fulfilled all other outstanding obligations including
submittal of the Final Report together with the full results of borehole logs, all
laboratory and in situ tests, he shall issue a Certificate of Final Completion to the
Contractor stating the date on which the Works were finally completed.
30. SUSPENSION THROUGH FAULT OF CONTRACTOR
If the Contractor is in default of his obligations under this Contract, or if in the
Engineer's opinion the Contractor is not performing the Works or any significant
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part of it in a reasonable and standard manner, the Engineer shall, without prejudice
to the Employer's right to terminate the Contract have the right to suspend the
progress of the Works or any part thereof.
Suspension of the work or part thereof caused by or attributable to the Contractor's
default shall not be compensated for, nor shall it excuse the Contractor from any ofhis obligations under the Contract.
Suspension of the Contract shall continue until the Contractor has, in the opinion of
the Engineer, remedied the default.
31. TERMINATION FOR DEFAULT
If, in the opinion of the Engineer, the Contractor is not performing the Works with
due diligence, or if the Contractor consistently fails to obey the Engineer's
instructions given under the Contract or if otherwise fails to perform any of his
obligations under the Contract, the Employer may give seven days written notice to
the Contractor of his failure to fulfil the Contract or to remedy the default. If the
Contractor fails to remedy the default during this time, the Employer may
terminate the Contract forthwith and employ others to complete the Works.
The Contractor will not be entitled to any payment until the whole of the Works
have been completed and thereafter until the costs of execution, completion,
remedying of any defect, damages for any delay in completion and all other
expenses incurred by the Employer have been ascertained and the amount thereof
certified by the Engineer. The Contractor shall then be entitled to receive only suchsum (if any) as the Engineer may certify would have been payable to him upon due
completion by him, after deducting the said amount.
RISKS AND INSURANCES
32. CARE OF WORKS
(a) From commencement until to completion of the Works the Contractor shall
take full responsibility for the care thereof and shall rectify and make good,
at his own cost, as instructed by the Engineer, any damage, loss or injury
that may occur to the Works, from any cause whatsoever, other than the
excepted risks defined under sub-clause (b) of this Clause.
(b) The 'excepted risks` are war hostilities (whether war be declared or not),
invasion, acts of foreign enemies, rebellion, revolution, insurrection or
military or usurped power, civil war or riot, commotion or disorder.
33. DAMAGE TO PERSONS AND PROPERTY
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The Contractor shall indemnify and keep indemnified the Employer against all
losses and claims in respect of death or injury to any person, or loss of or damage to
any property whatsoever including that of the Engineer which may arise out of or in
consequence of the execution of the Works and against all claims, demands and
proceedings, damages, costs, charges and expenses whatsoever in respect of or inrelation thereto.
34. INSURANCE OF WORKS ETC.
Without limiting his obligations and responsibilities under Clause 32 hereof the
Contractor shall insure the Works against all loss or damage from whatsoever cause
arising (other than the excepted risks) and for which he is responsible under the
terms of the Contract and in such manner that the Contractor is covered during the
period of execution of the Works to the full cost of re-execution and replacement of
such Works.
35. THIRD PARTY INSURANCE
Without limiting his obligations and responsibilities under Clause 33 hereof the
Contractor shall insure in the joint names of the Contractor and the Employer,
against liabilities for death or injury to any person (including any employee of the
Engineer or the Employer) or loss of or damage to any property (including that of
the Engineer) caused by or arising out of the execution of the Works.
36. ACCIDENT OR INJURY TO WORKMEN
The Employer shall not be liable for any damages or compensation payable at law
in respect of, or in consequence of any accident, death or injury to any workman or
other person in the employment of the Contractor. The Contractor shall maintain
all insurance required by law in respect of such liability.
37. TERMS AND EVIDENCE OF INSURANCE
The Contractor shall effect all insurances for which he is responsible under the
Contract with insurers and in terms approved by the Engineer.
The Contractor shall, prior to commencing the Works on Site, provide evidence to
the Engineer that such insurances have been obtained and effected, and shall when
required, produce to the Engineer the insurance policies in force and the receipt for
payment of the current premiums.
VARIATIONS AND FINAL ACCOUNT
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38. VARIATIONS
The Engineer may order any addition to or omission from the work to be performed
or order any other change in the Works and the Contractor shall promptly complywith such order. Any such order shall be in writing or shall be promptly confirmed
in writing by the Engineer if issued verbally. Whenever possible, the monetary
value of the variation shall be agreed between the Engineer and Contractor before it
is implemented and shall be valued at rates and prices entered in the Bill of
Quantities where such rates and prices are applicable to the varied work and on a
fair and reasonable basis where such rates and prices are not applicable.
39. FINAL ACCOUNT
As soon as possible after issue of the Engineer's Certificate of Final Completion
pursuant to Clause 29, the Contractor shall submit a Final Account showing:
(a) the value of work executed in accordance with the Contract.(b) any other amounts that the Contractor considers that he is entitled to under
the Contract.
The Engineer shall check the Final Account and may ask for further substantiation
of any amount stated in the Final Account and shall negotiate and agree with the
Contractor any adjustments to the amounts stated. The Engineer may also deductthe amount of any damages or other claim due to the Employer from the Contractor
under the Contract.
In the event of disagreement between the Engineer and the Contractor on any
amount stated in the Final Account, the Employer may withhold such amount
pending resolution of the disagreement but all undisputed amounts shall be paid in
accordance with Clause 41.
40. INCREASE OR DECREASE IN COSTS
No adjustment of the Contract Price shall be made in respect of any rise or fall in
the costs of labour, materials, testing or any other matters affecting the cost of
execution of the Works.
PAYMENTS
41. PAYMENT
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The Contractor shall be paid the Contract Price in accordance with the following
procedure:
(a) Forty percent (40%) upon issue of the Engineers Certificate of Final
Completion pursuant to Clause 29.
(b) Sixty percent (60%) upon agreement of the Final Account pursuant to Clause
39.
DISPUTES
42. DISPUTES
If within 60 (sixty) days after the date of submission by the Contractor of the Final
Account any outstanding dispute or difference has not been amicably agreed then
such dispute or difference shall be referred to and finally settled under the Laws of
State of Angola .
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AN11064-0100D-SPC-40A-GE-01 REV 0
PRC-EN-03 (F1A) REV 2 page 1/1
AN11064-0100D-SPC-40A-GE-01 REV 0
Table of contents
Ref Division section titleDesign discipline
Lead IDC
B Specification for Subsurface Investigation GE ENV,TR
IDC department
Department AR EL ENV GE LS PMC ME MR ST/BR TR
Approved
Date
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B. SPECIFICATION
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B. SPECIFICATION
FOR
SUBSURFACE INVESTIGATION
40:0 GENERAL
0101 REFERENCED STANDARDS: Unless the Contract Documents include more
stringent requirements, referenced standards have the same force and effect as if bound or
copied directly into the Specification to the extent referenced and such standards are made
a part of the Contract by such reference.
0151 REFERENCED STANDARDS: The Contractor shall comply with the latest
published edition of referenced standards, including any supplements or revisions, in effect
as of the date fixed for submission of Tenders:
where a particular referenced standard is published or available in both imperial and
metric versions, then the metric version shall apply, unless otherwise indicated or
approved.
where compliance with two or more standards is specified and the standards
establish different or conflicting provisions for minimum quantitative or qualitative
requirements, comply with the most stringent requirement. Refer uncertainties and
requirements that are different, but apparently equal, for a decision by the Engineer,before proceeding.
the Contractor shall obtain copies of the latest published edition of all standards
referred to in the Specification. These shall be kept on the Site and made available
upon request for reference and use by the Engineer.
40:1 PARTICULAR REQUIREMENTS
1051 TYPE OF INVESTIGATION AND REPORT REQUIRED: geotechnical
investigation and report giving a full description of subsurface conditions and results of in
situ and laboratory testing together with recommendations for foundation design and
construction. Detailed description of the surface conditions and features within the site
shall be provided.
1055 TYPE OF INVESTIGATION AND REPORT REQUIRED: geotechnical
investigation and factual report giving a full description of subsurface conditions and
results of in situ and laboratory testing. Detailed description of the surface conditions and
features within the site shall be provided.
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1071 DESCRIPTION OF THE SITE: Construction of the Edifc.das Naes Unidas para
os PALOP'S at Angola.
1101 BOREHOLES: the total linear meters of borehole drillings shall be 205 m. A total
of 8 boreholes shall be drilled at the location and to a depth as shown in the drawings.
1102 BOREHOLES: the Contractor will be given the opportunity to comment on the
number, depths and positions of boreholes and invited to suggest alterations and additions
both before and during execution of the work.
1103 BOREHOLES: Boreholes shall be drilled to the depths shown on Drawings. If rock is
encountered, continuous coring shall be carried for a minimum of 5.0 m into good quality
rock or to the depths shown on Drawings whichever is achieved first or as directed by the
Engineer. Good quality rock is defined as rock with rock quality designation (RQD) value
more than 75% for a core run of 1.0 m and a core recovery of not less than 90%.
1121 TRIAL PITS: a total of three (3) trial pits shall be excavated to 3 m depth at the
locations shown in the drawing.
1151 IN SITU TESTS:
Standard Penetration Test
Dutch Cone (Static) Penetration Test
Pressuremeter Test
In Situ Permeability Constant Head
In Situ Permeability Falling Head
1201 LABORATORY TESTS: The following tests are to be carried out as frequently as
required, subject to the Engineer's approval, to describe adequately the natural variability in
the soil deposit:
moisture content
sieve analysis for granular materials
mechanical analysis by sedimentation for fine materials
dry and bulk densities of cemented and cohesive soil
plasticity indices
Linear shrinkage of soil
specific gravity
chemical analysis of soil and ground water
calcium carbonate content of soil or rock
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unconfined compression tests on cohesive soils
unconsolidated undrained triaxial compression tests on cohesive soils
consolidated drained direct shear (or triaxial) compression tests on cohesive soils
one dimensional consolidation tests on cohesive soils
determination of the dry density/moisture content relationship of soil
determination of the California Bearing Ratio (CBR)uniaxial compression tests on rock cores
static elastic modules of cores
point load index of rock samples.
1251 RESPONSIBILITY: The Contractor is responsible for:
true and proper setting out of boreholes and test locations in relation to permanent
reference points or bench marks
accuracy of levels of tops of boreholes
accuracy of depth records to given bench marks on or near the site
accuracy of his observations generally and for his reports on the observations.
1253 QUALITY ASSURANCE - CODES AND STANDARDS: Comply with provisions
of following codes, specifications, and standards, except where more stringent
requirements are shown or specified: ASTM Standards, BSI Standards, ISRM 1985, Earth
Manual.
1301 QUALITY ASSURANCE - SUPERVISION: the Contractor's agent for the work is to
be, or alternatively he is to have on his staff, a soils' engineer, engineering geologist, or
geotechnical engineer fully experienced in site investigation work. This specialist is to be
on the site full time readily available to both the drillers and the Engineer.
1351 PROJECT CONDITIONS - SERVICES AND STRUCTURES: where underground
services or structures are thought to exist in the immediate vicinity of a borehole position,
an exploratory pit is to be dug to such a depth that it is reasonably certain that all
underground services and structures have been uncovered. After this normal boring may
proceed.
1401 PROJECT CONDITIONS - POLLUTION: do not foul the atmosphere, any river,
stream, watercourse or sewer. Make provision for discharge or disposal from the work or
temporary work of water waste products and spoil however arising. Method of disposal is
to be to the satisfaction of the Engineer and of any other authority or person having an
interest in any land or watercourse over or in which water and waste products may be dis-
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charged. Requirements of this clause will not limit any of the Contractor's statutory
obligations or liabilities.
1402 PROJECT CONDITIONS - POLLUTION: ascertain any natural or man-made
sources of pollution which might deleteriously affect groundwater.
1451 POSITION OF BOREHOLES: fix positions of boreholes and standpipes as installed
from features of the site for ease of reference and record their co-ordinates in the report on
the investigation.
1501 OBTAINING AND STORING SAMPLES: methods of sampling and subsequent
handling, labelling and storage of samples are to be in accordance with the applicable
procedures described in ASTM 04.08.
1551 SUBMITTALS - DAILY BOREHOLE RECORDS: daily borehole records shall be
submitted to the Engineer not later than noon on the following day.
1552 DAILY TEST PIT RECORDS: daily test pit records shall be submitted to the
Engineer not later than noon on the following day.
1553 DAILY REPORTS: should include weather conditions, work progress, difficultiesand any other significant event.
1554 SUBMITTALS - PROGRAMME OF LABORATORY TESTING: programme of
laboratory testing is to be oriented towards obtaining data pertinent to the work.
Programme and type of laboratory testing are to be submitted to the Engineer for approval
for each borehole within 48 hours, after completion of the borehole.
1555 SUBMITTALS - GEOLOGICAL MAP: submit a detailed engineering geological
map showing surface deposits whether naturally occurring or man-made at a scale agreed
by the Engineer.
1556 SUBMITTALS - DRAFT REPORT: two (2) copies of the draft report including all
the requirements detailed in Clause 1560 below shall be submitted to the Engineer for
approval at least six (6) days before the end of the Contract Period. The Engineer shall
inform the Contractor of any corrections or amendments within three (3) days of receipt of
the draft.
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1560 SUBMITTALS - FINAL REPORT: four (4) bound copies and one (1) unbound copy
of the accepted report in English, describing the work shall be produced in A4 size and
contain the following factual information:
Exploratory borehole records;
In situ test records;
Plots of all laboratory and in situ test results against depth;
Laboratory test records and summaries;
Plans with location of exploratory holes;
Plan showing surface deposits / rock outcrops, fill, geologic features (Engineering
Geological map);
Schedule of contents;
Independently bound appendix of colour photographs of all rock cores, test pits and
trenches and any other features relevant to the text and observations;
Geological cross section(s) of the site;
Soft copies using EXCEL version 5.0 or latest version, shall be submitted on
computer CD /DVD which shall include:
- All laboratory testing, in tabular and graphical form
- Summary tables of the laboratory testing results
- Soil and rock classification.
Soft copies of boreholes and test pits shall be submitted in Excel or any other
approved programme.
The soft copy of the text of the report shall be submitted in MICROSOFT WORD
Version 6.0 or latest version.
40:2 BORING AND SAMPLING
2050 EXPLORATORY PITS: an exploratory test pit shall be hand dug at borehole location
to ascertain that drilling shall avoid all existing underground utilities.
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2051 BORING METHOD: support boreholes with casing as necessary to prevent collapse
of sides. Bentonite may be used when this will not interfere with sampling of soil or in situ
testing.
2052 BORING METHOD: carry out work in such a way that groundwater levels over thesite are not generally affected and take precautions to prevent surface water entering
boreholes.
2053 BORING METHOD - BORING IN SOIL: boring in soil is to be to minimum
diameter of 150 mm, unless otherwise directed by the Engineer, and undertaken either by
shell and auger (cable percussion) or by rotary power hollow stem auger of type which
enables samples of at least 100 mm diameter to be obtained using open or piston samplers.
2054 BORING METHOD - BORING IN ROCK: unless otherwise specified for in situ
tests in boreholes, drill rock by rotary coring methods to obtain cores of not less than
76 mm diameter.
2055 BORING METHOD - BORING IN ROCK: use of rotary percussion method of
drilling (down the hole hammer) will only be allowed with the approval of the Engineer.
2071 BORING METHOD - DRILLING FLUID: drilling fluid is normally to be fresh water
in order not to contaminate the soil and affect the results of insitu permeability tests. Amixture of water and bentonite may be allowed, subject to the Engineers approval, if there
is difficulty in keeping borehole sides stable. Where the presence of collapsible soils is
suspected, air drilling shall be used to maintain the natural moisture content of the samples.
Use of air or air entrained foam or other fluids will be allowed only with the approved of
the Engineer or when it is the only means to obtain good quality samples (refer to Clause
2272).
2101 BORING THROUGH OBSTRUCTIONS: if an obstruction is encountered which
prevents further progress in boring by shell and auger or rotary power auger, attempt to
break through the obstruction by chiselling. If size or composition of obstruction is such
that little or no progress is made by chiselling, inform the Engineer and if instructed use
rotary coring methods to drill through and obtain cores of the obstruction not less than
100 mm diameter.
2102 BORING THROUGH OBSTRUCTIONS: if boring shows that the obstruction is
bedrock, continue rotary core drilling to depth and diameter required by the Engineer to
prove continuity and engineering characteristics of formation.
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2103 BORING THROUGH OBSTRUCTIONS: if boring shows that the obstruction is
boulder, ledge of rock or other object underlain by soil, inform and agree with the Engineer
the use of one of the following lines of action:
chisel out the cored borehole through the obstruction sufficient to allow shell andauger boring, in situ sampling and testing to continue below the obstruction continue
boring by rotary core drilling to required depth and diameter of borehole and agree
with the Engineer as to whether or not it is necessary to obtain undisturbed samples of
soils in a nearby borehole at levels beneath the obstruction
abandon borehole and drill another one nearby to obtain necessary samples.
2151 GROUNDWATER OBSERVATIONS: When groundwater is encountered in a
borehole immediately cease boring and observe and record by means of a dipmeter / water
level meter any movement in level of groundwater. Cease boring for half an hour at the
end of which period again record water level. Obtain the Engineer's instructions and, if re-
quired by him, install standpipe or piezometer as specified on completion of borehole.
2152 GROUNDWATER OBSERVATIONS: Observe and record changes in water level in
deeper aquifers. Make records of groundwater levels as specified and refer to datum used
for the work.
2153 GROUNDWATER OBSERVATIONS: If casing is used and this forms a sealagainst entry of groundwater, record depth at which no further entry or only insignificant
infiltration of water occurs.
2154 GROUNDWATER OBSERVATIONS: If it is necessary to add water to the
borehole to facilitate boring, use sparingly and not in such a manner as to prevent accurate
observation of groundwater conditions in the borehole.
2155 GROUNDWATER OBSERVATIONS: Install standpipes in bore-holes to the
numbers and depths required by the Engineer. Standpipe is to comprise a rigid polyvinyl
chloride or galvanised iron pipe 45 mm minimum diameter having at its lower end an
approved porous filter element or alternatively perforated for a length of at least 500 mm.
Surround filter or bottom of pipe with sand or sand and gravel mix graded to prevent entry
of soil particles into pipe. Place layer of graded mix in bottom of borehole prior to
lowering stand-pipe. Place sand or sand and gravel mix in position before withdrawing
borehole casing. Provide screwed cap to top of standpipe which is not to be less than 150
mm below ground level. Protect cap with short length of 150 mm diameter pipe set
vertically with upper end covered by paving slab set flush with ground surface.
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2156 GROUNDWATER OBSERVATIONS: When instructed by the Engineer fill
annulus above filter with a layer of bentonite - cement grout. Drop a plug of stiff bentonite
in the form of balls down borehole and carefully tamp into place and follow by pumping
down bentonite - cement grout to fill borehole to a level of at least 0.5 m above filter or as
instructed by the Engineer. When instructed by the Engineer also form a plug of bentonite
- cement mix of stiff plastic consistency and carefully tamp into place below level ofstandpipe to form seal against upward flow of groundwater into standpipe from a deeper
aquifer.
2157 GROUNDWATER OBSERVATIONS: During the period of the work take daily
readings of water levels in all standpipes by means of a dipmeter / water level meter or, if
so directed, at more frequent intervals. When directed by the Engineer return to the site at
intervals to make additional water level readings.
2201 SOIL SAMPLING - UNDISTURBED SAMPLES: obtain in all cohesive soils or
mixed soil having sufficient cohesion at depth intervals of 1m. The 200 mm of soil
immediately above the level of soil to be sampled should be removed without the casing
being lowered. Carefully clean boreholes before sampling.
2202 SOIL SAMPLING - UNDISTURBED SAMPLES: take samples in seamless
sampling tubes not less than 100 mm internal diameter and 450 mm long designed so that
samples can be sent to the laboratory without removal. Area ratio of sampling tube is to be
less than 15%.
2203 SOIL SAMPLING - UNDISTURBED SAMPLES: oil the sampling tool inside and
out. Force tool into soil by jacking or, where this is not possible, by carefully hammer
driving. Check distance tool is driven to prevent soil becoming compressed in sampler.
Use double tube samplers or piston samplers if these prove to be the only means of
obtaining acceptable samples. In soft clays take particular care to avoid disturbance of
sample. In hard clays or cemented soils use a Denison sampler or similar.
2204 SOIL SAMPLING - UNDISTURBED SAMPLES: immediately after taking
samples from the boreholes remove a 25 mm thick layer from each end and seal ends with
a thick coating of paraffin wax or other wax approved by the Engineer. Store the 25 mm
thick layers in an airtight container for classification testing. Place a close fitting lid or
screwed cap over each sample tube end and make tube airtight. Send samples to the
laboratory, suitably packed to prevent damage or disturbance. Number and label each tube
so that sample can be identified giving borehole, soil stratum, depth at which it was taken
and date.
2251 SOIL SAMPLING - DISTURBED SAMPLES: perform standard penetration test as
specified to recover a disturbed sample of soil at intervals of not more than l m in the top 5
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m and at intervals of 1.5m or at the change of each strata thereafter, unless otherwise
instructed by the Engineer.
2252 SOIL SAMPLING - DISTURBED SAMPLES: where undisturbed soil samples and
standard penetration test samples are not obtained, recover disturbed samples of soils fromboring tools. Obtain disturbed samples at such spacing to ensure that samples from
borehole either in the form of undisturbed samples, standard penetration test samples or
disturbed samples are obtained for every 1 m depth bored. Minimum weight of disturbed
samples is to be as specified in ASTM D 420.
2253 SOIL SAMPLING - DISTURBED SAMPLES: where soil samples are required for
compaction tests, the minimum weight of sample is to be 50 kg, unless otherwise instructed
by the Engineer.
2271 CORING: continuous cores of all cemented material are to be recovered, great care
being taken to obtain good recovery of weakly cemented material. Core barrel is to be
fitted with coring bit most suited to formations being drilled and which yields best
recovery.
2272 CORING: for coring in marl or other material that may be sensitive to water,
compressed air shall be used as drilling fluid to obtain good samples.
2273 CORING: coring runs are to be limited to not more than 2 m. However, if core
recovery is less than 80% the run is to be reduced until an acceptable recovery for
subsurface conditions is obtained, as approved by the Engineer.
2301 ROCK SAMPLING - ROTARY CORING METHODS: where boreholes are bored
using rotary coring methods, extract rock cores of not less than 76 mm diameter, unless
otherwise directed by the Engineer. After being brought to the surface remove core from
core barrel by methods designed to cause least possible further disturbance.
2302 ROCK SAMPLING - ROTARY CORING METHODS: where split inner core barrels
are not in use extract core by steadily applied pressure. Extraction by means of hammering
the barrel or explosive extrusion under high air pressure or water pressures will not be
permitted. After extrusion place core in a purpose made core box.
2303 ROCK SAMPLING - ROTARY CORING METHODS: adequately preserve cores
and log. Photograph weak rock cores and those subject to disintegration on recovery.
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2351 ROCK SAMPLING - CORE BOXES: to be of sound, robust construction able to
withstand weight of core and any full boxes which may subsequently be placed on them
and sufficiently watertight to protect core from rain. They are to be specially made to hold
size of core being obtained tightly in place in rows separated by wooden slats. Boxes are to
have strong metal hinged lid fitted with padlock, hasp and staple for closing and end ropes
for handling. Top and bottom of boxes are to be reinforced by cross straps to aid stackingand retrieval. Boxes are to be constructed of wood, marine plywood or other material
approved by the Engineer.
2401 ROCK SAMPLING - PLACING CORES IN BOXES: as cores are extruded lay them
in core box with shallowest core to left and deepest to right. Place highest row of core
nearest lid hinge. Box is to be identified inside and outside by the site name, borehole
number, core box number, depth of top and bottom of core included, the Contractor's name
and the date. Information is to be either painted on box or stamped on metal labels waxed
and nailed to box.
2402 ROCK SAMPLING - PLACING CORES IN BOXES: paint the depth of the top and
bottom of the total core and separate core runs on blocks of wood or other material
approved by the Engineer made to fit between dividing slots.
2403 ROCK SAMPLING - PLACING CORES IN BOXES: in order that zones of core loss
can be readily identified insert wooden dowels cut to appropriate lengths and suitably
identified either in sections where loss occurred or at base of particular core runs.
2404 ROCK SAMPLING - PLACING CORES IN BOXES: first seal with aluminium foil
and subsequently cover with wax, sections of core which are weak and friable, formed of
rocks or soils which are likely to dry out or otherwise alter in nature with time, before
placing in core box.
2405 PHOTOGRAPHS: all core boxes shall be photographed as soon as possible after
extraction. Photographs shall be free from distortion and shall include a scale and colour
chart. All boxes shall be clearly labeled and show the depth to the top and bottom of each
core run.
2451 HANDLING SOIL AND ROCK SAMPLES: Take care in handling and transporting
samples of soil and cores of rock from the site to the testing laboratory. Where possible
use transport manned by skilled personnel and arrange that those responsible for
transporting samples are informed of the need to avoid unnecessary disturbance.
2470 SOIL AND ROCK DESCRIPTION: All soil and rock description shall be in
accordance with BS 5930. Alternatively, the following general scheme could be used in the
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description of the surface geology and all soil and rock samples from either boreholes or
test pits.
SOIL ROCK
Prefixes
Strength or relative densityStructure and weathered state
(if appropriate)
Colour
Secondary constituents
Particle shape and grain size
(for coarse grained soils)
ColourGrain size
Texture and structure
Weathered or alteration state
Discontinuities
SOIL NAME (in capitals) ROCK NAME (in capitals)
Suffixes
Plasticity (for fine grained soils)
Minor constituents and lithologicalcharacteristics
Other information of special engineering
interest
Geological formation (in brackets)
Mechanical strength
Minor lithological characteristicsOther information of special engineering
interest
Geological formation (in brackets)
2501 GROUNDWATER SAMPLING: Take a sample of groundwater as soon as sufficient
water has entered borehole after boring has reached groundwater level.
2502 GROUNDWATER SAMPLING: If water has been added to bore-hole before
reaching groundwater level bale out all water in borehole and allow uncontaminated
groundwater to seep back into borehole before sample is taken.
2503 GROUNDWATER SAMPLING: Where groundwater is sealed off by borehole
casing and a lower aquifer is encountered take a sample of water from this and any
succeeding aquifers.
2504 GROUNDWATER SAMPLING: Sample of groundwater is to be at least 500 ml involume and placed in clean jars or bottles already rinsed with the water to be sampled and
labelled and stored as described in BS 5930.
2551 COMPLETION AND BACKFILLING BOREHOLES: Completion of boreholes and
start of backfilling are to be approved by the Engineer unless he has given prior instructions
on depth at which boreholes are to be terminated. Place soil back-filled into boreholes in
layers, each successive layer being tamped by boring tools.
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2552 COMPLETION AND BACKFILLING BOREHOLES: Backfilling is to be done as
casing is withdrawn.
2553 COMPLETION AND BACKFILLING BOREHOLES: When instructed by the
Engineer backfill boreholes with concrete having a cement content not less than 250kg/m3.
2554 COMPLETION AND BACKFILLING BOREHOLES: When instructed by the
Engineer backfill boreholes with bentonite/cement mix of approved consistency.
2555 COMPLETION AND BACKFILLING BOREHOLES: When instructed by the
Engineer suitably plug boreholes where they might otherwise penetrate an aquiclude and
thus lead to contamination of water in an aquifer or to problems presented by encountering
water when engineering works are undertaken within the relatively impermeable ground
represented by the aquiclude.
2556 COMPLETION AND BACKFILLING BOREHOLES: Where boreholes are to be
backfilled in areas of present or future underground water supplies obtain advice from
water authority concerned on the particular measures required to prevent pollution.
2601 TEST PITS - EXCAVATION: Excavate test pits having plan area of not less than 1.5
m2 in positions instructed by the Engineer. Provide all pumping and take all measures (e.g.sheet piling, timbering etc.) to ensure stability of adjacent structures or installations and
safe conditions for descent into and working in the pits. While observations are in progress
take all necessary steps to exclude water from test pits.
2602 TEST PITS - DISTURBED SAMPLES: take disturbed samples every 1m or at every
change of strata, whichever is the least. Minimum weight of samples is to be as specified in
ASTM D 422 for classification.
2603 TEST PITS - DISTURBED SAMPLES: take a minimum of two representative
samples suitable for compaction testing from each test pit in accordance with Clause 2253.
2604 TEST PITS - UNDISTURBED SAMPLES: take undisturbed samples, as required by
the Engineer, in accordance with Clauses 2202, 2203 and 2204.
2605 TEST PITS - GROUNDWATER SAMPLES: take groundwater samples in
accordance with Clause 2504.
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2606 TEST PITS - PHOTOGRAPHS: a minimum of two photographs per test pit shall be
taken. Photographs shall be free from distortion, shall be clearly labeled and shall include a
scale and colour chart.
2607 TEST PITS - BACKFILLING AND REINSTATEMENT: test pits shall not be
backfilled without the Engineers instruction. Place backfill into test pit in layers, each
successive layer being tamped. Reinstate surface to condition existing before excavation to
the satisfaction of the Engineer.
2610 TEST PITS - COLLAPSIBLE SOILS: Where possible, undisturbed samples shall be
obtained by hand carving for the purpose of odometer testing.
2620 TEST PITS - COLLAPSIBLE SOILS: dry density shall be measured at various
horizons in the pit. Plate load test in unsoaked and soaked conditions shall be performed to
determine the most critical collapse potential below foundation level.
2651 BOREHOLE RECORDS: Supply to the Engineer a journal of each days boring not
later than noon on the following working day.
2652 BOREHOLE RECORDS: Where boring is by shell and auger or rotary power auger
the journal is to state:
Job name
date and times of boring
borehole number
ground level at position of boring
type of plant used and method of boring
diameter of boring
diameter and depths of casing
all water levels encountered including measurements of fluctuation of adjacent tidal
waters, lakes or rivers
depths at which groundwater was sealed off
level at which groundwater was standing at commencement and termination of
working day (where a boring is on land but is near tidal waters the level of those
waters is to be recorded at intervals throughout the day)
level at which water, if any, was added to borehole
levels of water in standpipes
depths of base of each stratum from ground level and preliminary description of
stratum
records of in situ tests made and instrumentation installed
time for chiselling through obstruction and weight of chisel
other relevant remarks.
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2653 BOREHOLE RECORDS: Where boring is by rotary coring methods the journal is to
state:
Job name
date and times of boringborehole number
ground level at position of boring
type of plant used and method of operation including details of type of flushing
type of core barrel and bit
depth of hole at start and end of working day or shift as relevant depth of start and
finish of each core run
core diameter and changes in core size
state of bit
time to drill each core run
character and proportion of each flush return
level at which groundwater was standing at commencement and termination of
working day (where a boring is on land but is near tidal waters the level of those
waters is to be recorded at intervals throughout the day)
depths of base of each stratum from ground level and preliminary description of
strata
total core recovery (TCR) defined as percentage of the rock recovered during a
single core run, with information as to possible location of core loss
Rock Quality Designation (RQD) of each run; RQD is the ratio expressed as a per
cent of aggregate length of core pieces over 100mm in a run divided by length of
run
Solid core recovery defined as percentage of full diameter core recovered during a
single core run
Fracture Index defined as the number of fractures per unit meter.
details of in situ tests and instrumentation installed
other relevant remarks.
2654 BOREHOLE RECORDS: Where boring is from marine craft other relevant remarks
are to include:
state level to which borehole data to be referred
time and height of high and low water at a tide gauge and tidal heights at intervals
as directed by the Engineer
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time and height of water levels at borehole position at intervals as directed by the
Engineer
details of movement of water levels within borehole related to fluctuation of water
levels at borehole locations
detailed records of delays due to reasons other than failure of boring equipment
(e.g. craft dragging anchors, mist, shipping movements and broken drilling tubes)
detailed records of movements, vibration and oscillation of drilling tubes
detailed records of bowing of drilling tubes because of waves, tidal currents etc.
2655 TEST PIT RECORDS: Where test pits are excavated the journal is to state:
dates and times of excavation
test pit number
ground level at position of test pit
type of plant used and method of excavation
stability of sides and method of support
dimensions of pit
depth at which groundwater was encountered, assessment of rate of infiltration and
details of water pumped outdepths of base of each stratum from ground level and detailed description of
stratum
records of samples taken and in situ tests made
sketches of two sides of pit
sketch showing orientation of photographs
details of backfilling
other relevant remarks
2701 FINAL BOREHOLE LOGS: after completion of all soil tests and visual examination
of all samples in the laboratory prepare final borehole logs including grid or topographical
reference and details similar to those in borehole records but corrected in the light of all
information finally available and in the light of description by a qualified soils engineer or
engineering geologist.
2702 FINAL BOREHOLE LOGS: in the case of cores obtained by rotary drilling methods
the final borehole logs are to state in addition to information given in borehole records:
condition of each core run in terms of percentage recovery and rock quality
designation, i.e. percentage of solid core recovered in pieces longer than 100 mm
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definition of rock type, its alteration state and relative strength; details of natural
discontinuities and rock structures and nature of joint or fracture infillings.
2703 FINAL TEST PIT LOGS: after completion of all soil tests and visual examination ofall samples in the laboratory prepare final test pit logs including grid or topographical
reference and details similar to those in test pit records but corrected in the light of all
information finally available and in the light of description by a qualified soils engineer or
engineering geologist.
2751 VARIATIONS: the Engineer, upon examination of borehole logs, may request
changes in number, location and depth of boreholes. The Contractor will not be entitled to
modify his unit prices as a result of such changes.
40:3 IN SITU TESTING
3101 STANDARD PENETRATION TEST: This test is to be performed at 1.0 m intervals
in the top 5 m and at intervals of 1.5 m and at the change of each stratum thereafter. If
gravely soil is encountered the standard penetration tool is to be fitted with a cone at its tip
and test carried out as normal. Standard penetration test sampler is to have internal
diameter of 35 mm and external diameter of 50 mm and is to be driven with a 63.5 kg
hammer dropped 0.76 m. Hammer is to be dropped using free-drop trigger release
mechanism allowing control of the 0.76 m drop. Bottom of casing is to be stopped at testlevel and borehole cleaned down to bottom of casing and test is to start from that level
down. Casing is not to be lowered during performance of the standard penetration test.
3102 STANDARD PENETRATION TEST: This test is to be performed to ASTM D 1586.
Notwithstanding all precautions specified to avoid carrying out test in loosened soil, there
is good reason to believe that unrealistically low results are being obtained or soil flows
into borehole so fast as to prevent test being carried out, report to the Engineer and obtain
his instruction regarding whether an alternative test is to be undertaken.
3151 STATIC (DUTCH) CONE PENETRATION TEST - APPARATUS: Penetrometer
for static cone penetration test is to consist of a rod with cone and sleeve which surrounds
rod so arranged that both cone and sleeve can be advanced together or independently of
each other. Alternatively the cone is to be fixed to the end of a hollow rod without means
of independent movement. Cone is to have apex angle of 60 degrees and cross-sectional
area of 0.01 m2. Mantle is to be provided above cone.
3151 STATIC (DUTCH) CONE PENETRATION TEST - APPARATUS: Penetrometer is
to be forced into soil by means of a static load. Where required depth of penetration is not
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great and soil is suitable, static load may be provided manually. Elsewhere apply load by
mechanical means using as resistance either kentledge, screw anchors or other approved
means.
3151 STATIC (DUTCH) CONE PENETRATION TEST - APPARATUS: Measure loadapplied to penetrometer by pressure gauge, strain gauges or other means approved by the
Engineer.
3201 STATIC (DUTCH) CONE PENETRATION TEST - OPERATION OF
APPARATUS: To carry out test first drive cone and sleeve of penetrometer together into
soil to measure combined cone and shaft resistance. Then advance cone independently of
sleeve to measure cone resistance alone. Alternatively push down the hollow rod fixed to
the cone in a continuous movement. In this case measure resistance of soil to thrust by the
cone and skin friction on mantle above cone continuously by means of electrical resistance
strain gauges installed within these components.
3202 STATIC (DUTCH) CONE PENETRATION TEST - OPERATION OF
APPARATUS: Carry out tests at convenient intervals generally not exceeding 250 mm
until required depth of penetration has been reached.
3203 STATIC (DUTCH) CONE PENETRATION TEST - OPERATION OF
APPARATUS: If progress becomes impossible before specified depth has been reached,
drill a borehole to level where progress ceased and continue test from bottom of this bore-hole or successive boreholes drilled in like manner until specified depth has been reached.
3251 STATIC (DUTCH) CONE PENETRATION TEST - RESULTS OF TESTS: to be
presented in the form of three graphs:
combined penetration resistance of cone and sleeve plotted against depth
penetration resistance of cone plotted against depth
penetration resistance of sleeve plotted against depth.
Provide an interpretation of results if instructed.
3401 PRESSUREMETER TEST: Ensure that pressuremeter tests are carried out by those
competent in the testing technique and its interpretation. Method used should conf