contract 2197 –‘muela construction adit leakage rehabilitation

18 July 2019

LHWPPre-Tender Meeting:Contract 2197 – ‘Muela Construction Adit Leakage Rehabilitation

LHDA 2197 PRE-TENDER MEETING OUTLINE • Welcome, Registration & Administration

• Housekeeping and Safety▪ Registration – Mandatory▪ Indemnity Form▪ Certificate of Attendance – Bidders only

• Presentation Overview

• Overview of LHDA 2197 Contract Scope

• Structure of Tender Document

• Specific Procurement Requirements

• Tender Evaluation

• Commencement

• Q&A

• Site Visit Briefing

‘Muela Access Tunnel to valve chamberPlan Layout

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‘Muela Underground WorksAccess tunnel to valve chamber - Section

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‘Muela Underground WorksAccess adit plan layout

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‘Muela Surge Shaft Section

Contract LHDA 2197: MUELA ADIT LEAKAGE REPAIRIsometric Model showing the Works and Identified Geological Fracture

Contract LHDA 2197: MUELA ADIT LEAKAGE REPAIRIsometric Model showing potential Leakage Source Locations

Probable source of leakage at bottom of concrete section

Probable source of leakage at Throttle Plate

Unlikely but possible source

of leakage

Contract LHDA 2197: MUELA ADIT LEAKAGE REPAIR

Waterway Photos

Bottom section of

Surge Shaft looking up

waterways into steel

lined Riser Shaft.

Note Throttle Plate in

middle of Riser Shaft.


Waterway Photos

Top section of Surge

Shaft looking down

towards waterways.

Note Riser Shaft at

bottom.


Waterway Photos

Transfer Tunnel

Concrete Lining behind

Adit Bulkhead Dome.

Scope of Works

The work to be carried out under this Contract comprises inter alia the following:

• Undertake a water pressure testing to identify source locations of leakage from the Shaft into the water bearing feature.

• Rotary core drilling and pressure grouting required to seal the water leakage in the ‘Muela Adit and Penstock Valve Chamber. This will require grouting of the vertical fracture zone and other associated water bearing features around the Surge Shaft.

• Non-destructive radiographic testing of welds in the Riser Shaft and ground penetration radar scanning for potential voids behind the steel and concrete linings in areas identified as potential leakage sources.

• Undertake welding repairs of welds in existing steel linings and throttle plate in the Surge Shaft Riser Shaft.

• Contact and cavity grouting of any voids detected behind the linings.

• Corrosion protection of portions of steel linings which had undergone weld repairs and corrosion protection repairs in areas where the existing corrosion protection in the Riser Shaft has failed or suffered damage.

• Ancillary works such as installing access from top and bottom of shaft and providing measures to protect existing equipment in the Valve Chamber and access adits.

• Checking adequacy of work done upon refilling of the System and undertaking any additional grouting if considered practical.

• Fulfilment of other general contractual obligations inter alia in respect of such matters as programming, construction and quality control, health and safety, training, environmental and liaison requirements, etc.

• Providing the necessary Works and measures to ensure appropriate environmental protection and mitigation of detrimental effects thereon.


The Contractor shall include in his team the following Specialists

• Drilling and Grouting specialist

• A roping specialist to install craneage and related equipment and safety gear. The contractor will also undertake himself ortrain staff to undertake visual inspections; installation of strain gauges and monitoring thereof; NDT testing from the top ofthe Riser Shaft and caulking of leakage locations identified during inspections.

• Staging or access infrastructure specialist contractor to install mobile access platforms for testing and weld repair work to bedone from the bottom and upwards in the Riser Shaft. The Contractor may also elect to undertake work in the Riser Shaftfrom the top of the Surge Shaft. His intended method will be described in the relevant method statements.

• Non-destructive testing (NDT) specialist to undertake scanning of the field welds in the Riser Shaft steel lining, analysis ofresults and reporting. A combination of GPR (Ground Penetrating Radar) or X-Ray scanning devices will also be used todetect the presence of any voids or cracks behind the steel liner in the Riser Shaft and along the bottom section of theconcrete lined part of the Surge Shaft.

• Welding contractor to repair any cracked field welds identified during the NDT testing. NDT specialist to rescan all repairwork on completion.

• Corrosion protection application contractor reapply corrosion protection on the repaired areas. The specialist contractor willalso be tasked to repair any other damage to the corrosion protection identified during inspections during the course of theOutage.


The envisaged Program of Work

• Mobilise and establish on Site: 01 September to 30 September 2019.

• Commencement of Planned Maintenance Outage: 01 October 2019. Refilling of the System to commence on 25November and recommissioning of the System on 1 December 2019.

• Dewatering of Transfer Tunnel and ‘Muela Power Station: 01 October to 06 October 2019.

• Complete installation of craneage and roping at top of Surge Shaft: 06 October 2019.

• Commencement of core drilling of lead holes from the Cross-Cut Gallery: 01 October 2019.

• LHDA to remove ‘Muela Access Adit Bulkhead Dome to gain access into the underground works: 07 October 2019.

• Installation of access infrastructure up the Riser Shaft: 07 October, installation progressing with the progress of NDTup the Riser Shaft. NDT work undertaken both from bottom (and top of Riser Shaft using roping team if required):07 October to 13 October 2019.

• Water pressure testing from lead cored hole in the Cross-Cut Gallery, marking and caulking of leakage locationsinside Shaft and Waterways: 07 October to 13 October 2019.

• Inspection of the Works by specialists from Client, Consultant and the Contractor: 07 October to 13 October 2019.

• Commencement of coring Drilling and Grouting from the Cross-Cut Gallery, Valve chamber and ‘Muela Adit: 14October 2019.

• Completion of all work and handing over: 24 November 2019.

• Re-filling of Transfer Tunnel and Power Station: 25 November 2019.

• Generation of Power and water transfer recommences: 1 December 2019.


Program of Work

• Goal is to have a Contractor appointed by 2 September 2019.

• Part 1 – Tender Procedures:

▪ Section 1 - Standard Instructions to Tenderers (ITT)

▪ Section 2 - Tender Data

▪ Section 3 - Evaluation Criteria

▪ Section 4 - Returnable Schedules

▪ Section 5 - LHWP Anti-Corruption Policy

STRUCTURE OF LHDA 2197 TENDER DOCUMENT

• Part 2 – Works Requirements

▪ Section 6 - Scope of Works

▪ Section 7 - Drawings

▪ Section 8 - Specifications

▪ Section 9 - Supplementary Information (Not Used)


• Part 3 – Conditions of Contract & Contract Forms

▪ Section 10 - General Conditions of Contract

▪ Section 11 – Annexure and Particular Conditions

▪ Section 12 - Tax Requirements

▪ Section 13 - Payment Procedures

▪ Section 14 - Contract Forms


SPECIFIC PROCUREMENT REQUIREMENTS

• Submission of Tender Document before Closing Date: Thursday, 8 August 2019 (10:00hrs) Lesotho Time

• Place: LHDA, 7th Floor, Lesotho Bank Tower, Maseru

• Late submissions will not be accepted

• One original plus four hard-copies

• Comply with the Instructions in Section 1 of the Tender Document

• Submission to be signed by suitably authorized person, every page initialled, Power of Attorney to be provided

NB: Section 1 – Instructions to Tenderers

Section 3 – Evaluation Criteria regarding basis for Bidders being ineligible or disqualified

• Section 2 – Tender Data Sheet requirements▪ Mandatory Pre-Tender Meeting – Copies available

▪ Alternative Tenders are not permitted (TN1)

▪ Validity of Bids – 60 Calendar Days

▪ Tender Security of LSL 100 000.00 (or ZAR)

▪ Submission 1 original, 4 hard copies & 1 CD ROM

▪ Clarifications – In writing 14 days prior to submission date

(24 July 2019)

▪ Answers to clarifications will be published on

http://www.lhda.org.ls/lhdaweb/procurement/currentTenders#list-phaseI


• Tenderers may associate with others in JV • Tenderers may subcontract up to max 40% of

the contract amount• Subcontractors value > 10% to be named, and

activity(s) identified• Price adjustment (escalation) will not apply

• Contract award information will be posted on the LHWP Phase I web site


• Undertaken in three (3) stages:

▪ Stage 1 - Initial Determination of Responsiveness

▪ Stage 2 - Minimum Technical Requirements

▪ Stage 3 - Financial

SECTION 3: EVALUATION OF TENDERS

• Initial Determination of Responsiveness:

▪ Compliance with the tender requirements

▪ Attendance of Pre-Tender Meeting & signed

attendance register

▪ Observance of pricing instructions

▪ Return & complete all Returnable Schedules

▪ No material Deviations, Reservations or

Omissions

Tenders failing to meet the responsiveness requirements will not proceed to Stage 2

STAGE 1 – RESPONSIVENESS

• Minimum Technical Requirements

▪ Tenders will be scored & required to achieve a

minimum of 70 points and 60 against the subtotal for

Criterion 2, 3, 5 and 7

1. Management Approach and Organisational structure (5 points)

2. Key Personnel (25 Points – Minimum 15 Points)

3. Contractor’s Equipment (15 points – Minimum 9 points)

4. Proposed methodology (20 points)

5. Contractor’s experience (15 points – Minimum 9 points)

6. Historical non-performance (5 points)

7. Financial Capability (15 points – Minimum 9 points)

Tenders failing to meet the minimum technical requirements will not proceed to Stage 3

STAGE 2 – TECHNICAL REQUIREMENTS

The score for Tender Price shall be determined as follows:

(a) Application of the prescripts of ITT 33 to the corrected Tender Price

(b) Calculate a score for the Tender Price using the following formula:

𝑁𝐹 = 1 −𝑃𝑡 − 𝑃𝑚𝑖𝑛𝑃𝑚𝑖𝑛

Where:

NF = the score for Tender Price awarded for the tender under consideration

Pt = Corrected Tender Price of the tender under consideration (with adjustments made in accordance with ITT 33)

Pmin = Corrected Tender Price of the lowest cost tender satisfying the minimum technical requirements (with adjustments made in accordance with ITT 33)

NP = Total Preference Score = NF

STAGE 3 – FINANCIAL

CONTRACT

• FIDIC Short Form of Contract, First Edition 1999 (Green Book)

• Appendix and Particular Conditions

• Any reference to the “Engineer” shall mean the “Employer’s

Representative” in terms of the Contract

COMMENCEMENT

• Letter of Acceptance (LoA) 2 September 2019

▪ Performance security (10% of Contract price)

required within 14 days of LoA

▪ Programme within 7 days of LoA

▪ Commencement within 28 days of LoA

• Negotiations with preferred tenderer 26 – 30 August

ADDENDUM & CLARIFICATIONS

• Published on LHDA Phase 1 website

http://www.lhda.org.ls/lhdaweb/procurement/currentTenders#list-phaseI

▪ Check the LHDA website on a regular basis

• No currently published Addenda / Clarifications

• Questions to be e-mailed to MSKC

• All written queries will be responded to formally via the LHWP Phase I website

• Only formal written responses published on the LHWP Phase I web site will be taken as binding

• Enquiries: [email protected]

QUESTIONS & ANSWERS

BRIEFING FOR SITE VISIT

• Safety Matters – PPE requirements

• All visitors to Site to sign an Indemnity Form▪ Construction Adit▪ Be aware of water and electricity▪ Use flashlights▪ Uneven surface

• Surge Shaft.▪ Stay on the road and in convoy. Steep drop-off.▪ Shaft is very deep.▪ Take care not to drop any foreign objects.▪ Take drinking water, appropriate clothing &

footwear▪ Note: No ablution facilities available on Site

• On Site – please stay in the group• Site visit - promptly after this meeting

THANK YOU …AND GOOD LUCK

contract 2197 –‘muela construction adit leakage rehabilitation

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