JOHN P. TURNER, PH.D., P.E., PG, D.GE Senior Principal Engineer

Professional Experience

Years of experience at DBA: Joined May 2011 Professor Emeritus of Civil & Architectural Engineering, University of Wyoming (2011) Professor of Civil & Architectural Engineering, University of Wyoming (1986-2011) Visiting Professor of Civil Engineering, University of Canterbury, New Zealand (1994 and 2002) Visiting Professor of Civil Engineering, Sydney University, Australia (1993) Graduate Research Assistant, Department of Civil Engineering, Cornell University (1982-1986) Engineering Geologist, Herbert & Associates, Virginia Beach, VA (1976 – 1978)

Education

Ph.D., Geotechnical Engineering, Cornell University, 1986 B.S., Civil Engineering, University of Wyoming, 1981 M.S., Civil Engineering, University of Wyoming, 1982 B.S., Geology, James Madison University, 1976

Professional Registration and Licensure

Licensed Professional Engineer: CA, CO, MD, NY, OK, OR, WY Licensed Professional Geologist, KY Diplomate, Geotechnical Engineering – The Academy of Geo-Professionals

Fields of Expertise

Design, construction, and load testing of deep foundations; specialist in rock-socketed drilled shafts; micropiles Design and construction of anchored geo-support systems for support of excavation (SOE) and landslide stabilization Geotechnical site investigation and evaluation of soil and rock properties; Engineering geology Geotechnical Engineering Education Expert Services for Litigation and Claims Disputes

Recent Major Projects

Purple Line Light Rail Transit – Bethesda, MD (2016 – present) – Engineering design of foundations and retaining walls for 16-mile extension of the Washington DC Metro in Maryland. Shallow and deep foundations for 34 bridges consisting of drilled shafts, driven piles, micropiles, anchored footings. Retaining walls including soil nailing, anchored and cantilevered soldier piles, stem walls, and MSE walls. Design-build project for Maryland Transit Administration.

TH-53 Bridge – Virginia, MN – Foundation design, engineered slopes, and rockfall mitigation for 250-ft high bridge spanning an open-pit iron ore mine on the Mesabi Range in Northern Minnesota. Client: Parsons Transportation Group; Owner: State of Minnesota. Bridge completed in Spring 2018.

Goethals Bridge – Port Authority of NY-NJ – Foundation design engineer as member of design-build team replacing the existing Goethals Bridge with cable-stayed bridge supported on large-diameter rock-socketed drilled shafts; consultant on load testing to establish design parameters for rock sockets. Repair of drilled shafts with defective concrete. Clients: Parsons Transportation Group and NYNJ Link. Bridge completed in March 2018.

Tangent Pile Retaining Wall for Slide Stabilization- Kansas City (2016) – Design of tangent pile wall for stabilization of landslide affecting adjacent buildings. Client: Powers, Taylor, and Mills Engineered Foundation Construction, LLC.

Fore River Bridge – Quincy-Weymouth, MA (2012-2013) – Design consultant for large-diameter drilled shafts in rock supporting vertical lift bridge; consultant on O-cell load testing to establish design parameters for rock sockets. Client: Parsons Transportation Group.

Bridge at Pitkins Curve – Big Sur, CA (2007-2011) – Consultant to Caltrans on design and construction of rock-socketed drilled shaft foundations for bridge spanning a major coastal landslide.

Expert Services - Engineering analysis, preparation of expert opinions, and expert testimony. Recent cases include: DSC claims for hard rock in drilled shaft construction (San Diego, CA, Redding, CA, Johnston County, OK); defective drilled shafts constructed under slurry (Santa Fe, NM); rockfall hazard in open pit mines (Gillette, WY); damage to adjacent structures in response to retaining wall construction (Aspen, CO); forensic analysis on causes of landslide (Jackson, WY).

Professional Memberships and Honors

American Society of Civil Engineers (ASCE) and Geo-Institute (GI) of ASCE Past Chairman, Committee on Deep Foundations Past Member, Editorial Board, Journal of Geotechnical and Geoenvironmental Engineering ADSC: The International Association of Foundation Drilling Honorary Technical Affiliate President’s Award (2000) Outstanding Service Award (1992) Deep Foundations Institute (DFI) Instructor for NHI-FHWA courses: Drilled Shafts; Soil Nail Walls; Micropiles

Selected Publications

Turner, J.P. (2018). “Geotechnical Resistances of Drilled Shafts in Triassic Basin Sedimentary Rocks”, Proceedings, 30th Central PA Geotechnical Conference, American Society of Civil Engineers, Hershey, PA, Oct 31 – Nov 2, 2018.

Turner, J.P., Dapp, S.S., and Brown, D.A. (2016). “Rock-Socketed Drilled Shafts for the Goethals Bridge Replacement”, Proceedings, 41st Annual Conference on Deep Foundations, Deep Foundations Institute, New York, NY, Oct 2016, pp. 337-346.

Dapp, S.S., Turner, J.P., and Brown, D.A. (2016). “Load Tests on Drilled Shafts at Goethals Bridge Replacement”, Proceedings, 41st Annual Conference on Deep Foundations, Deep Foundations Institute, New York, NY, Oct 2016, pp. 551-560.

Daita, B., Turner, J.P., and Jen, M. (2016). “Goethals Bridge Replacement Foundation Design Modifications in Response to Field Conditions”, Proceedings, 41st Annual Conference on Deep Foundations, Deep Foundations Institute, New York, NY, Oct 2016, pp. 465-475.

Turner, B.J. and Turner, J.P. (2016). “Analysis of Structural Capacity and Stiffness of Drilled Shafts with Construction Defects and Repairs”, Proceedings, 41st Annual Conference on Deep Foundations, Deep Foundations Institute, New York, NY, Oct 2016, pp. 751-761.

Graham, D.S., Turner, J.P., and Axtell, P.J. (2016). “Rockfall Hazard Mitigation at the TH-53 Bridge, Virginia, MN”, Proceedings, 67th Highway Geology Symposium, Colorado Springs, CO, July 2016, pp. 202-221.

Turner, J.P. and Halvorson, M. (2013), “Design Method for Slide-Stabilizing Micropile Walls” Geotechnical Special Publication No. 231, Geo-Congress 2013: Stability and Performance of Slopes and Embankments III, ASCE, Reston, VA, pp 1971-1983.

Turner, J.P., Duffy, J.D., Buell, R., and Zheng, X. (2012), “Rock-Socketed Foundations for the Bridge at Pitkins Curve”, Geotechnical Special Publication No. 225: Geo-Congress 2012: State of the Art and Practice in Geotechnical Engineering, ASCE, Reston, VA, pp. 414-423.

Brown, D., Turner, J., and Castelli, R. (2010). “Drilled Shafts: Construction Procedures and LRFD Design Methods,” Geotechnical Engineering Circular No. 10 and FHWA/NHI Publication 10-016, Reference Manual and Participants Guide for National Highway Inst. Course 132014, 972p.

Turner, J.P. and Ramey, S.B. (2010), “Base Resistance of Drilled Shafts in Fractured Rock”, Geotechnical Special Publication No. 198: The Art of Foundation Engineering Practice, ASCE, Reston, VA, pp. 687-701.

Turner, J.P., Anderson, S.A., and Siel, B.D. (2007), “Slope Stabilization by Ground Anchors”, Landslides and Society: AEG Special Publication No. 22, Association of Environmental and Engineering Geologists, Editors: A.K. Turner and R.L. Schuster, Denver, CO, pp. 297-316. [also Theme Lecture, 1st North American Conference on Landslides].

Turner, J.P. (2006), "Rock Socketed Drilled Shafts for Highway Transportation Structures", Synthesis of Highway Practice No. 360, Transportation Research Board, National Academies, Washington, D.C., 136 p.

Turner, J.P. (2005), "Lessons Learned from Anchored Slide Stabilization", Proceedings of GEO3, International Conference on Quality Assurance and Quality Control in Geo Construction, ADSC: International Association of Foundation Drilling, Dallas, TX, pp. 8-25.