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From page 152... ... B-1 Appendix B: Case Study Reports As part of Task 3a of the research proposal, a case study protocol was developed based on the findings from the surveys, the content analysis and the literature review with the objective of identifying, analyzing and understanding the current models for successful geotechnical risk management on projects delivered using DB project delivery. This protocol is then used to conduct structured face-to-face interviews, producing results with established points of comparison and a high level of reliability. Read the entire page →
From page 153... ... B-2 This appendix details the findings from each of the performed case study interviews and provides supporting information on the way the geotechnical risks were contractually handled by the different agencies. Table B Read the entire page →
From page 154... ... B-3 Location: St. Louis, Missouri Award Year: 2012 Contract Amount: $111,000,000 Status: Completed Scope of work: The project consists of building a new bridge over the Missouri River to connect St. Read the entire page →
From page 155... ... B-4 Project Delivery Method: MoDOT performed an initial Risk Assessment on the I-64 Daniel Boone Bridge Project and determined that Design-Build Delivery Method was an appropriate delivery method for the project risks. The advantages of MoDOT's innovative Design-Build contracting method are as follows: Design-Build (DB) Read the entire page →
From page 156... ... B-5 The Proposers shall provide the Additional Applicable Standards that include construction specifications, special provisions, design requirements (by discipline) , standard drawings, materials and testing requirements, and manuals proposed for the Project." Differing Site Conditions (DSC) Read the entire page →
From page 157... ... B-6 notification as soon as practicable. The Contractor shall immediately stop Work and secure the area…" Agency approach to manage the geotechnical risk: The overall approach to manage the geotechnical risks in this project was to provide as much information as possible to the proposers in the form of a GBR. Read the entire page →
From page 158... ... B-7 Case Study 2: I-15/I-215 Interchange – San Bernardino, California This project was selected as a case study due to the highly complex geotechnical conditions that were identified and addressed prior to advertising the RFP. This project is located in an area between two major faults (San Andreas and Jacinto) Read the entire page →
From page 159... ... B-8 Contractual Provisions: Alternative Technical Concepts: ATCs were received from non-winning proposers utilizing spread footings. - Contractual clause extract: "3.7 Alternative Technical Concepts Department has chosen to use the Alternative Technical Concepts (ATC) Read the entire page →
From page 160... ... B-9 (a) subsurface or latent physical conditions that differ from those reasonably assumed by Design-Builder based on incorrect boring logs provided in Book 2 to the extent that correct boring logs would have resulted in accurate assumptions, or (b) Read the entire page →
From page 161... ... B-10 using design-bid-build or CM/GC contract. In the case of DB project, a detailed geotechnical exploration and design parameters should be provided up front prior to the release of the RFP. Read the entire page →
From page 162... ... B-11 adequate to support future structures such as the combination of extremely high embankment with extremely weak soil. In addition, the design of environmental specifications to be made was considered as a geotechnical risk. Read the entire page →
From page 163... ... B-12 The Design/Builder shall present proposed concepts for variation to vertical and horizontal alignment shown in the contract plans, variations to median widths and variations to the Black Ankle Valley bridge at the Design Alternate Meetings. The Design/Builder may also propose revisions to the contract, including the Scope of Services, Special Provisions, or Specifications, for review by the Department. Read the entire page →
From page 164... ... B-13 as much geotechnical investigation is made as DBB project delivery, but also to do it right. INDOT consulted the geotechnical risk with its pre-qualified consultants, and specified a mandatory soil improvement design in the contract. Read the entire page →
From page 165... ... B-14 5 lanes in each direction with the addition of a high occupancy vehicle (HOV) lane and a general purpose lane. Read the entire page →
From page 166... ... B-15 problem was to redesign the embankment so the dimensions are reduced and the load on the soil lowered. Project Delivery Method: The decision to use DB was motivated by 1) Read the entire page →
From page 167... ... B-16 Department comments will be limited to a statement that the proposer's approach appears to be generally acceptable and within the requirements of the RFP documents, or identification of areas in which the approach appears to be inconsistent with the RFP requirements. Department comments will be returned to the proposer not later than two (2) Read the entire page →
From page 168... ... B-17 shall be responsible for, and agrees to issue Change Orders for additional costs due to changes in the Work directly attributable to Differing Site Conditions and not reasonably avoidable by Contractor. 13.9.1.1 Burden of Proof. Read the entire page →
From page 169... ... B-18 Case Study 5: I-15 SR-73 Pioneer Crossing – Lehi, Utah This project is the second case study obtained from Utah DOT and is particularly interesting to this research to illustrate how geotechnical risks are currently being handled as compared to their first large DB project in 1996, the I-15 Corridor Reconstruction Project in Salt Lake City. This project was not initially identified as one with a high geotechnical risk, but the presence of a wetland in the area combined with the implementation of an ATC increased the risk and ended up requiring a geotechnical-related change order. Read the entire page →
From page 170... ... B-19 Geotechnical Risks: This project was not considered to have particularly high geotechnical risks when estimated by UDOT. The presence of a wetland was identified but the original alignment was not intended to use that area. Read the entire page →
From page 171... ... B-20 (B) Allow the Department to consider Proposer ATCs in making the selection decision; (C) Read the entire page →
From page 172... ... B-21 Any ATC that has been pre-approved may be included in the Project, subject to the conditions set forth herein. If a Proposer is unsure whether a concept is consistent with the requirements of the RFP or if that concept would be considered an ATC by the Department, the Department recommends that Proposer submit such a concept for review as an ATC." Differing Site Conditions (DSC) Read the entire page →
From page 173... ... B-22 A Immediately notify the Department verbally of alleged changes to the Contract due to Differing Site Conditions. Read the entire page →
From page 174... ... B-23 shall be made promptly after completion of the site exploration in the area, and the Plans shall be based on the conditions as identified in such exploration. Read the entire page →
From page 175... ... B-24 Geotechnical risk considerations for DB projects: UDOT's opinion stands that liquefaction and seismic-related risks could preclude a project from being DB delivery method given that the effect of these risks will not be apparent during construction or the warranty period. Therefore, the design-builder might attempt to ignore those risks. Read the entire page →
From page 176... ... B-25 Figure B.1 - Plan View of Dallas Horseshoe Project Project components: - Replace bridges that cross Trinity River on I-30 and I-35E - Connect roadways where they converge near the downtown Dallas Central Business District - Upgrade outdated roadway design improving safety, and increasing capacity and mobility - Meets the North Central Texas Council of Governments 2035 Metropolitan Transportation Plan (MTP) Geotechnical Risks: This project is considered to have high geotechnical risks due to the high uncertainty related to presence of around 30 to 40 feet of loose clay and soft soil (poor soil conditions) Read the entire page →
From page 177... ... B-26 Project Delivery Method: The Project Delivery Method used is Design-Build with the exception of the Margaret McDermott Bridges, for which the design was developed by the owner and provided in the specifications (Design-Bid-Build) Read the entire page →
From page 178... ... B-27 nevertheless be proposed in accordance with the terms and conditions set forth in this ITP. Sections 3.1 through 3.5 set forth the process for pre-Proposal review of ATCs. Read the entire page →
From page 179... ... B-28 develop the Project in accordance with existing approvals without additional cost or extension of time. Any ATC that has been pre-approved may be included in the Proposal, subject to the conditions set forth herein. Read the entire page →
From page 180... ... B-29 additional costs resulting from the $150,000 "deductible" amounts borne by DB Contractor. Read the entire page →
From page 181... ... B-30 13.8.1.5. Each request for a Change Order relating to a Differing Site Condition shall be accompanied by a statement signed by a qualified professional setting forth all relevant assumptions made by DB Contractor with respect to the condition of the Site, justifying the basis for such assumptions, explaining exactly how the existing conditions differ from those assumptions, and stating the efforts undertaken by DB Contractor to find alternative design or construction solutions to eliminate or minimize the problem and the associated costs. Read the entire page →
From page 182... ... B-31 Except as otherwise provided and subject to the limitations in this Section 13.8 and other provisions of this Agreement, TxDOT shall be responsible for the aggregate additional construction costs incurred by DB Contractor directly attributable to such Margaret McDermott Bridges Design Change, such that a Change Order will be issued in the amount of 100% of such additional costs. In determining whether a Change Order is allowed under this Section 13.8.5, DB Contractor shall bear the burden of proving that all costs incurred are reasonable and necessary and could not have been avoided by reasonable construction techniques." Agency approach to manage the geotechnical risk: Given the inherent geotechnical risk, TxDOT procured the project as a DB delivery in order to encourage innovation. Read the entire page →
From page 183... ... B-32 documentation of the Project Management Plan that are labeled "A" in the column titled "Required By" in Attachment 2-1 to the Technical Provisions. It also authorizes DB Contractor to enter Project Right of Way owned by TxDOT for the purpose of conducting surveys and site investigations, including geotechnical, Hazardous Materials and Utilities investigations. Read the entire page →
From page 184... ... B-33 and progressively issue notices to proceed as preliminary studies and design advance under a guaranteed maximum price. Location: Montgomery and Frederick Counties, Maryland Award Year: 2017 (Est.) Read the entire page →
From page 185... ... B-34 The SHA has developed goals for the project. The goals are as follows: 1. Read the entire page →
From page 186... ... B-35 Once the design has been completed to the necessary level for any work package to submit a price, the SHA will attempt to reconcile a Construction Agreed Price (CAP) for the construction of that work package. Read the entire page →
From page 187... ... B-36 Administration will consider placing acquisition services on the Design-Builder if agreed upon in the development of a CAP. When utility relocations are required, the Administration will establish relocation costs for utilities to be relocated by parties other than the Design-Builder. Read the entire page →
From page 188... ... B-37 RFQ page 21: "A stipend in the amount of $750,000.00 may be paid to a Proposer not meeting either of the above conditions if the Proposer has a Proposed Technical Concept (PTC) the Administration wishes to utilize in the final design." Differing Site Conditions (DSC) Read the entire page →
From page 189... ... B-38 the location studied. The Administration assumes no responsibility in respect to the sufficiency of the studies for design. Read the entire page →
From page 190... ... B-39 specific impact on the Design and Preconstruction Services. For the avoidance of doubt: (1) Read the entire page →
From page 191... ... B-40 Geotechnical risk considerations for DB projects: According to the interviewee, the major disadvantage of DB delivery is the loss of DOT control on the project. Public considerations can be sensitive when working on projects near park or areas of public interest. Read the entire page →
From page 192... ... B-41 northern section of project, the required dewatering to occur prior to construction, the micro tunnel required with location of pre-determined receiving pits. The location of the project was categorized as: Below the pavement and topsoil layers, the borings encountered primarily medium dense to very dense sand and gravel consisting of gravel (a-1-a) Read the entire page →
From page 193... ... B-42 1) Subsurface or latent physical conditions at the site differing materially from those indicated in the Contract Documents and are not discoverable from an investigation and analysis of the site by the DBT meeting the standard of care for such an investigation and analysis. Read the entire page →
From page 194... ... B-43 2) All costs which exceed the amount identified in item #1 above will be computed and paid to the DBT without any markup. Read the entire page →
From page 195... ... B-44 Scope of work: Replacement of the I90 Bridge over Cuyahoga River Valley in downtown Cleveland. Includes associated roadway work to reconfigure the Interchanges adjacent to the bridge work. Read the entire page →
From page 196... ... B-45 "104.02.B Differing Site Conditions. Notify the Engineer as specified in C&MS 104.05 upon discovery of any of the following conditions: 1) Read the entire page →
From page 197... ... B-46 1) The first $500, 000 of direct costs and associated impact will be the responsibility of the DBT. Read the entire page →
From page 198... ... B-47 Case Study 10: Port Access Road – Charleston County, South Carolina This project was selected as a study due to the high geotechnical risk involved. The project is located in a highly seismic location and the subsurface conditions consisted of liquefiable soils, soft compressive clays, high variability due to dipping stratum, and the potential for environmental contamination. Read the entire page →
From page 199... ... B-48 Project Delivery Method: The following criteria determines the project delivery method: size/estimated dollar value of the project, challenging ground conditions, environmental contamination, and potential for innovation. The agency is evaluating the use of a decision-making matrix for future projects, a Design-Build Manual is under development. Read the entire page →
From page 201... ... B-50 - An attempt to reduce overall risk was made by conducting relatively extensive geotechnical and environmental testing prior to issuing an RFP. A specified dollar allowance was included in the RFP Agreement for testing and handling of hazardous materials (environmental contamination) Read the entire page →
From page 202... ... B-51 in GBRs or Data Reports. The agency believes that projects where there is significant risk of longterm settlement of embankments and/or structures, or any risks for which the agency needs to retain control are geotechnical factors that SCDOT would advise against the use of DB delivery method. Read the entire page →
From page 203... ... B-52 Markers 1 and 4. Portions of eastbound I-40 fell into the river. Read the entire page →
From page 204... ... B-53 "102-7 SUBSURFACE INVESTIGATION REPORT If a subsurface investigation report is available on a project, a copy may be obtained by the plan holders upon request. The subsurface report and the subsurface investigation on which it is based was made for study, planning and design and not for construction or pay purposes. Read the entire page →
From page 205... ... B-54 the type of materials and conditions that may be encountered. The bidder or contractor is cautioned to make independent subsurface investigations, as he deems necessary, to satisfy himself as to conditions to be encountered on this project. Read the entire page →

From page 152...

... B-1 Appendix B: Case Study Reports As part of Task 3a of the research proposal, a case study protocol was developed based on the findings from the surveys, the content analysis and the literature review with the objective of identifying, analyzing and understanding the current models for successful geotechnical risk management on projects delivered using DB project delivery. This protocol is then used to conduct structured face-to-face interviews, producing results with established points of comparison and a high level of reliability.