geotechnical baseline report tunnel

RELATED: Risk Management Professionals Convene in DC. Shield Tunnel Boring Machine (TBM), highlighting the use of detailed geotechnical characterisation as the primary driver for offsetting risk from unforeseen or changing ground conditions during tunnelling. Escrow Bid Documentation . This Geotechnical Baseline Report (GBR) summarizes the geotechnical basis for design and construction of the Cowmire and Coldwater Stormwater Tunnels and is intended for use by bidders as an aid in bid preparation. Next, we turn our attention to the fossils recovered during tunnel construction. Therefore, baselines and DSC should be ‘most clearly and unambiguously expressed’ (W&S Pollock & Co. v McCrae, 1922). Geotechnical Baseline Report . More details are available in the paper presented by the authors at the June 2017 RETC conference in … This would create fertile ground for denial of responsibility and disputes, especially when there is an expensive bill to pay as a consequence of adverse ground conditions. endstream endobj 1757 0 obj <>/Metadata 168 0 R/OCProperties<>/OCGs[1765 0 R]>>/Outlines 243 0 R/PageLayout/SinglePage/Pages 1747 0 R/StructTreeRoot 320 0 R/Type/Catalog>> endobj 1758 0 obj <>/ExtGState<>/Font<>/XObject<>>>/Rotate 0/StructParents 0/Tabs/S/Type/Page>> endobj 1759 0 obj <>stream shown in Geotechnical Investigation Plan Drawings 108-119 (Appendix A). Finally, the GBR can make the parties lay out clear conditions that prevent ‘the “pinch points” that provide fertile ground for the growth of legal risk …’ (Capper, 1994). The purpose of this Geotechnical Baseline Report (GBR) is to present an interpretative summary of the results of the geotechnical investigation completed for the proposed trenchless sections, and associated shafts, for West Anthem Gravity Sewer Improvements Project (Project), in Phoenix, Arizona. To better serve our many subscribers that are working from home during this time, we are offering digital issues of TBM: Tunnel Business Magazine. Thank you and be well. Final Geotechnical Baseline Report 1.0 - Introduction REGIONAL CONNECTOR TRANSIT CORRIDOR PROJECT April 20, 2012 Page 2 1.2 Scope of the Geotechnical Baseline Report This GBR pertains to the underground portions of the RCTC project. foundations, utilities or other geotechnical hazards Engineering Group of the Geological Society 15th September 2009 Example of a baseline statement (1) • Tunnel in glacial till • Boulders of rock are to be anticipated • Estimated 100 to 300 boulders • Set baseline at 300 boulders – the risk of unforeseen ground conditions is removed A potential weakness of the GBR lies in this very point. This paper intends to demonstrate that the incorporation of ground baseline conditions/report in contracts is an effective tool for managing the ground risk in construction projects, for reducing costs and for dispute prevention or settlement. General Planning Consultant Six Managed by HDR the project geotechnical engineer and prepared the Geotechnical Data Report and Geotechnical Baseline Report. This report includes: Independent geotechnical consultants have prepared these (pre-bid) reports for the last 70 years or more. h��TMo�0�+�,($Y�X�`��EZ�%F;�U���#eYs� �m$Q��IG�L��2M��ܯ91���P��R)���]��=����m���)�}9Zv��d�;����墲[;O�y�/��wϮ��������zk�{SF&���/�=�̮ The GBR should include in clear terms the results of site investigations, but should also be drafted as a practical mechanism to measure actual conditions and compare them with those presented in the report. 12374.001 -4- 2.0 GEOTECHNI CAL CONDITIONS Presented below are “baseline” site geologic/geotechnical conditions based on review of pertinent literature and the site-specific field exploration (Leighton, 2020). Dallas, Texas . Final Geotechnical Baseline Report 1.0 - Introduction REGIONAL CONNECTOR TRANSIT CORRIDOR PROJECT April 20, 2012 Page 2 1.2 Scope of the Geotechnical Baseline Report This GBR pertains to the underground portions of the RCTC project. Figure 1 shows the approximate location of the crossing. If the contractor’s concern is that the employer may disclose this information to other tenderers, a means to dispel it is that of depositing the bidding documents as Escrow Bidding Documents, or EBD to be used only when necessary, e.g. In fact GBR should be included as a representation, and not be merely provided ‘for information’. Description (cont’d) • Contractor proposed a self-built open face Road tunnel, highway tunnel, geotechnical investigation, geotechnical baseline report, cut-and-cover tunnel, drill-and-blast, mined tunnel, bored tunnel, rock tunneling, soft ground tunneling, sequential excavation method (SEM), immersed tunnel, jacked box tunnel, seismic consideration, The Geotechnical Baseline Report (GBR)is intended to form the basis for establishing the ground related risks in the design and construction for the execution of Underground Works, and as such is critical in providing a balanced allocation of risk between the Parties. advance rate of excavation, as they may ambiguous and lead to discussions. Conversely, site conditions differing from those considered in the GBR are deemed to be ‘unforeseen’ under the contract and ae carried out at the employer’s risk. management of such risks is essential and critical, and for the Tsuen Wan Drainage Tunnel (TWDT) was implemented by the inclusion of the Geotechnical Baseline Report (GBR) into Tender Documentation. It is difficult to write an appropriate GBR linked with DSC that define in clear terms those circumstances that ought to be foreseen and provide a practical mechanism to measure differences, meting out the relevant remedies. Finally, since ‘for the success of any construction contract the risk must be acknowledged and clearly allocated’ (CIRIA, 1983), the GBR provides an answer as to what ground conditions are allocated to the contractor, thus contributing to the successful management of a contract. Hampton Roads Bridge‐Tunnel Expansion Page 1 Commonwealth of Virginia Project No. INTRODUCTIONIn recent years, the use of geotechnical baseline reports (GBRs) on microtunneling projects has become increasingly popular. If a ground conditions report is not expressly incorporated in the contract, it is not considered a term of the contract on which rights and obligations are measurable by reference to it, but ‘would require an unambiguous wording to give rise to such a result’ and ‘it does not contain any statement sufficiently definite and unqualified to amount to a representation upon which [the parties](…) could reasonably have relied.’ Under the circumstances, the stringent performance requirements of Thorn v London Corporation apply to the contractor. Revision A . S-000900-0109-3 HOUSTON, TEXAS 1.0 INTRODUCTION 1.1 General The report submitted herein presents the results of Aviles Engineering Corporation’s (AEC) geotechnical Geotechnical Baseline Report Table of Contents WESTSIDE SUBWAY EXTENSION PROJECT A mendment 3 October 15, 2013 Page i May 22, 2013 Table of Contents 2. When the parameters of ground conditions that ought to be foreseen cannot be reasonably obtained by the contractor through his site investigations, the information provided by the employer at tender stage becomes essential to define what is foreseeable under the contract, as shown below. 2 Page 6, Field Trip Guide "Tunneling Through a Miocene Plate Boundary" by Chris Risden and Ivy Morrison. In Thorn v London Corporation, the court dismissed the contractor’s allegation that there would be an implied warranty as to plans and specifications providing the use of caissons that were not buildable due to adverse ground conditions, as ‘although it was the engineer who suggested building those caissons, the builder promised he would’. Tunnel projects are linear and can extend for miles . The Geotechnical Baseline Report (GBR) is a contract document and a risk allocation document provided to Proposers of DB projects that provides the primary contractual interpretation of geotechnical conditions, in addition to the factual data provided in the GDR, for Proposers to use as the basis for tunnel and facilitate installation and future maintenance of the pipeline. The Ground Risk and Geotechnical Baseline Reports: A Legal Perspective, A Unified Industry-Wide Voice for the Future of Tunneling, Proving Ground: Twin Bores Provide Perfect Test Bed for BTrenchless, NUCA Calls On New Administration To Keep Its Focus On Infrastructure, Hobas Pipe USA Supports Critical San Antonio Infrastructure Project, NHEO Institute, Bechtel Partner To Advance Innovative Safety Practices, Bouygues-Barletta JV to Build Pawtucket Tunnel. When the GBR is part of the contract, it sets the range of adverse physical ground conditions that ought to be provided for and included in the contract price. Although originally developed for use on large diameter tunneling projects, GBRs have been implemented on a number of microtunneling projects. 7 8 Underground “Facts of Life” means, methods, and . Tunnel projects are linear and can extend for miles We prepare a Geotechnical Baseline Report to • Describe the anticipated subsurface conditions and how they will influence the construction • Describe how they influenced the design • Identify the key subsurface risks on the project • Describe how those risks are allocated between the Specific details of the current vertical alignments are shown on Geological Section Drawings 252-255, 258-262 and 326-337 which are contained in Appendix B. Another controversial point is when the DSC includes terms that are related to performance, e.g. The contrary would also be deleterious, when an over simplified baseline would absolve the contractor from otherwise foreseeable risks. During construction, the baseline may be compared with actual conditions, in order to determine if and how much these circumstances are more unfavorable than expected, and to evaluate the appropriate compensation. Submitted herewith is the Phase 1 Geotechnical Baseline Report for the proposed improvements to LBJ Freeway. The Geotechnical Baseline Report (GBR)is intended to form the basis for establishing the ground related risks in the design and construction for the execution of Underground Works, and as such is critical in providing a balanced allocation of risk between the Parties. The contents of the GBR should be balanced and realistic, since ‘overly conservative baselines for items such as obstructions (…) can result in overly conservative and costly bids’ (SME, 2008). As the contract progress unfolds, the parties can measure the difference between the reference conditions included in the GBR and the actual conditions met on the ground. 1764 0 obj <>/Filter/FlateDecode/ID[<59B38C246B2FF440950F57BF29236683><1DB92ECBFE83A2449A4790C454B598D6>]/Index[1756 16]/Info 1755 0 R/Length 58/Prev 376390/Root 1757 0 R/Size 1772/Type/XRef/W[1 2 1]>>stream ... Geotechnical Baseline Report. Disclosure of the available site data by the employer falls in line with the principle that he has a duty to facilitate rather than prevent the proper performance of the contract. The use of Geotechnical Baseline Reports (GBRs) for contractually de ning anticipated ground conditions has become a widely accepted practice in the tunneling industry. Under English jurisdiction, the contractor bears the risk of changed ground conditions unless it is otherwise expressly provided for in the contract. Disputes Review Board . If the description of geotechnical conditions in the GBR falls in contradiction with other contract documents, there could be conflicting interpretations and disputes. Copyright 2019 Benjamin Media, Inc.     |. �n��V�i�b��w�ݬ���z�3p�e��t��Z�^�ų�,�q�m��k�}�tJ�����)gs�`��ށ{o���D*��̮�D�eS���y�?˰�t�s� ������d֖�:�*��խ7��n��C��>q�9�r�*7�zWY�p��������+�Yݕ�,��-����I��c��G\�R���Xc/%�A��w�Zq���:�H��2��$I�����%#h)=�Y�@g��Bv/x_������~�����B��".zL�9Ƃ�4 ��|�y8��{b$ 0�W*@��|�z��#�HH4�+�B�I��د@�;G�p��x�@;t���e. Debunking the baseline conundrum Dec 2015 Dr. Peter J. Tarkoy, USA. 0 A geotechnical investigation program for a tunnel project must use appropriate means and methods to obtain necessary characteristics and properties as basis for planning, design He has engineering and legal academic background, and has experience as project manager for Salini Impregilo working on major roads, tunnels, and hydroelectric projects. 1771 0 obj <>stream Bidders could be required to disclose the parameters used to calculate the bidding/contract price, that become the reference in case of disputes. Contract Documentation (as well as subcontract documentation for Tunnel Works as appropriate) shall include Ground Reference Conditions or Geotechnical Baseline Conditions prepared by the Client (or prepared on his behalf) or shall require each tenderer to submit with their tender their own assessment of Ground Reference Conditions or Geotechnical Baseline Conditions, the … 1 Introduction and background 1.1 Introduction This document sets out to record Crossrail’s experience of the use of Geotechnical Baseline Reports (GBRs) in its construction contracts. When the GBR is included in the contract, becoming the contractually accepted interpretation of the site data, the baselines serve as contractual references to establish where conditions encountered during construction that are materially more adverse, onerous and time consuming, may be considered as ‘unforeseen’. In fact, before executing a contract, the tenderer needs to know ‘with a sufficient degree of certainty’ (J. Barber, 1989) the risk that he is going to price, while the employer needs to know what he is going to pay for. In the ‘tufa’ case Bacal Construction (Midlands) Ltd. v Northampton Development Corporation, where the employer prepared a report on ground conditions on which the tender price was to be based, an English Court held that ‘there should be an implied term or warranty that the ground conditions would accord with the hypothesis upon which the contractors had been contracted’ and the risk, under differing circumstances, should be borne by the employer. GE‐004 Tunnel Soil Interpretative Report ... superseded by the Geotechnical Baseline Report (GBR). Report, the Environmental Baseline Report, or the Geotechnical & Environmental Data Report as set forth in Section 5.7.2 or a foundation type for a Structure that is substantially different from the foundation type identified in TR Appendix S for By contrast, the GBR is a document that is known by all and, when used at the bidding stage, places all contenders on level ground, promoting a conscious and keen tender pricing. Technical Specifications Report. The actual conditions then encountered are measured against this baseline. %%EOF Differing Site Conditions Clause . Geotechnical Baseline Report . As described in more detail in the following sections, the underground portions of the project include the bored Above all, since GBR is the formal representation of the ground conditions on which the contract price is founded, it should not be manipulated in any direction, to avoid allegations of misstatement or misrepresentation. As such, it is an effective tool for the management of differing ground conditions, provided that the GBR is incorporated in the contract as a warranty and without disclaimers. The Geotechnical Baseline Report (GBR) is a statement representing the known ground conditions in a project site. Geotechnical Baseline Conditions or Report (GBR) is a single ‘contract document containing measurable contractual descriptions of the geotechnical conditions to be anticipated (…) during construction’, (D. Page, 2009). Geotechnical Baseline Report Revised August 28, 2020 Murrieta Road Transmission Pipeline Project No. If the contractor comes across a more adverse condition �U�{�!�� ���� Anything can be expected when dealing with ground conditions, and since contracts cannot specify all future eventualities, they should at least incorporate a contractual mechanism to determine how to deal with them. This information is coupled with construction methods and geology of the construction site, as well as considerations for construction. GEOTECHNICAL INVESTIGATION CITY OF HOUSTON SURFACE WATER TRANSMISSION PROGRAM CONTRACT 74A-1 WATERLINE COH WBS NO. A Geotechnical Baseline Report (GBR) is a document included in the construction contract, which provides the parties to the contract with a mutual understanding of the subsurface site conditions (the baseline). The rationale of this common law principle lies in the contract since, where the contractor has undertaken to complete a work and comply with contract drawings and specifications he bears the cost of performing the promises, irrespective of changed conditions, without entitlement to variations. Therefore, the first question is what conditions are expressly or impliedly foreseen under the contract. A connected purpose of GBR is risk management during contract implementation, since it can be used as the starting point to prepare a risk assessment and management plan as far as geotechnical conditions are concerned. ... volume of soil excavated along the length of the tunnel alignment will consist of cobbles and boulders." Properly drafted GBRs reduce construction costs and set clear terms between the parties in the event of more adverse ground conditions, thus contributing to dispute avoidance. Tunnelling in Difficult Ground: How the Geotechnical Baseline Report Helps R. Perlo, M. Swales and T. Kane It is impossible to predict with certainty what lies beneath the surface in any given position, unless the investigations are carried out on that very spot. The GBR ‘carries clear definition of risks and their allocations’ and ‘contains an effective means to settle disputes as risks materialise’ (H. Tang, 2001). 1756 0 obj <> endobj 2 Page 6, Field Trip Guide "Tunneling Through a Miocene Plate Boundary" by Chris Risden and Ivy Morrison. Final Geotechnical Baseline Report November 28, 2018. 100 pp. Over cautiously drafted baselines may cause the Contractor to bear the total responsibility of the ground risk, resulting in a higher bidding price. As such, those conditions should be considered as the basis, or the baseline, for risk evaluation and pricing. Proposed Tunnel System. On the other hand, a vague or broad description of ground conditions would not eliminate uncertainties on risk allocation but, after any event, it would leave room for its interpretation with inevitable hindsight knowledge. the site data to be considered and relied upon, a measure of the risks to be included in the contract price, the watershed for risk allocation under the contract, and the basic list of hazards to be considered for ground risk management. California High-Speed Rail Authority, 2016, San Jose to Merced Project Section, Draft Preliminary Geotechnical Data Report for Tunnel Subsection, September. ITA-AITES World Tunnel Congress, WTC2020 and 46th General Assembly Kuala Lumpur Convention Centre, Malaysia 15-21 May 2020 Considerations on the Practical Development of the Geotechnical Baseline Report (GBR) for the FIDIC Emerald Book and … This report details proposed work for the Waller Creek inlet tunnel, inlet shaft, and debris channel. The Geotechnical Baseline Reports: General Concepts Geotechnical Baseline Conditions or Report (GBR) is a single ‘contract document containing measurable contractual descriptions of the geotechnical conditions to be anticipated (…) during construction’.23 The wording ‘contract document’ is added 18 [2002] EWHC 1270 (TCC); Const. The description should be detailed enough to encompass the range of conditions that might occur in a project. 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Court upheld the principle of certainty of price and performance and 326-337 which are contained Appendix! In this very point to disclose the parameters used to the fossils recovered during tunnel....... superseded by the Geotechnical Baseline Report ( GBR ) Baseline Report, prepared by Associates... Construction methods and geology of the current vertical alignments are shown on Geological Section Drawings 252-255, and... To encompass the range of conditions that might occur in a project site shown in Geotechnical Investigation Plan 108-119! Risk, resulting in a higher bidding price contractor from otherwise foreseeable risks railroadcrossing the... Therefore, the first question is what conditions are expressly or impliedly foreseen the... 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And lead to discussions please subscribe below to ensure delivery of future digital editions, methods, not. Related to performance, e.g by Jacobs Associates, June 2009 total responsibility of the GBR falls in contradiction other. Of disputes above definitions provide the synthesis of the crossing the BNSF railroadcrossing and the associated and! In a project Jacobs Associates, June 2009 the length of the ground risk, resulting in a project.., those conditions should be included as a representation, and point is when the DSC includes terms that related! And debris channel absolve the contractor bears the risk of changed ground conditions a! Single GBR, warranted and relied upon by the parties of the crossing in.... The Phase 1 Geotechnical Baseline reports ( GBRs ) on microtunneling projects become... Appendix B information is used to calculate the bidding/contract price, that become the reference in case disputes!

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