David Drengenberg, PE, SE SENIOR ENGINEER + DIRECTOR of STRUCTURAL ENGINEERING and MECHANICS Mr

David Drengenberg, PE, SE SENIOR ENGINEER + DIRECTOR OF STRUCTURAL ENGINEERING AND MECHANICS Mr. Drengenberg has performed a wide variety of forensic engineering work relative to buildings and civil facilities as a member of CTLGroup’s Structural Engineering + Mechanics and Structural Evaluation divisions. Typical projects may require the investigation of design and construction deficiencies, which involve defect documentation, analysis, repair development, repair implementation, quality oversight, and associated litigation support related to defects and construction accidents. Other projects include investigation and causation analysis of structural and cladding damage attributable to wind, snow, fire, and earth pressures. Mr. Drengenberg has also assisted in development and implementation of safety recommendations, code revisions related to high-rise construction, and implemented structural quality training programs for New York City building inspectors.

Academic Credentials M.S. in Structural Engineering Representative Project Experience University of Illinois at Failure and Defect Investigation Urbana-Champaign, 2003 • Collapse investigation of a steel framed commercial facility - Illinois. Work included B.S. in Civil Engineering site investigation, wind analysis, causation reporting, and repair recommendations. University of Illinois at • Construction failure investigation of a steel seawall bulkhead system - Georgia. Work Urbana-Champaign, 2001 included site investigation, design analysis, repair analysis, development of an expert report, and mediation. • Investigation of construction defects in a megatall high-rise concrete foundation - Licensure/Certification Malaysia. Work included extensive site investigation, analysis, and critical formulation Professional Engineer of repair recommendations with project stakeholders. DC, IL, IN, MA, NC, OR, PA, SC, • Collapse investigation of two brick masonry buildings during demolition - Pennsylvania. TX, WI Work included stability analyses, and development of an expert report. • Investigation and documentation of construction defects in a high-rise concrete Structural Engineer foundation - California. Work included extensive site investigation, documentation, IL and analysis. NCEES • Collapse investigation of a steel framed commercial facility - Maryland. Work included site investigation, snow load analysis, causation reporting, and reconstruction recommendations. Professional Affiliations American Society of Civil Litigation Support Engineers • Collapse investigation of masonry building components supported by temporary shoring - Pennsylvania. Work included site investigation, analysis, code review, and expert reporting. Contact Information • Failure investigation of elevated concrete slab during construction - Oregon. Work 5400 Old Orchard Road included site investigation, analysis, development of expert opinions, and mediation. Skokie, Illinois 60077 • Documentation and initial structural assessment of collapsed temporary metal stage - Indiana. (847) 972-3064 • Peer review of report related to collapse of temporary metal framed structure for the [email protected] State Engineering Board of Texas. • Investigation of residential roof damage insurance claim - Colorado. Work included site investigation, snow load analysis, expert reporting, and expert testimony. • Investigation of residential hurricane claim - Texas. Work included site investigation, wind analysis, expert reporting, and expert testimony. • Investigation of precast building component collapse caused by vehicle impact - Kentucky. Work included site investigation, causation analysis, and reporting. • Supervised team of field engineers performing extensive conventional and post tensioned concrete investigative demolition, documentation, and repair development in support of litigation - Indiana

www.CTLGroup.com Structural Evaluation + Rehabilitation David Drengenberg, • Investigation and analysis of hurricane damage to several large commercial P.E., S.E. properties - St. Thomas USVI. Work is ongoing and has included site investigations, documentation, and wind analysis. • Investigation of construction defects at a concrete masonry structure - Wisconsin. Work is ongoing and includes destructive and non-destructive evaluation techniques. • Investigation of numerous residential wind damage claims - U.S. Midwest. Work is ongoing and includes site investigation, analysis, and causation reporting. • Investigation of structural damage insurance claims related to snow - Illinois. Work included site investigation, snow load analysis, and causation reporting. • Investigation of numerous residential and multi-family structure wind damage claims resulting from Hurricane Harvey - Gulf Coast. Work included site investigation, wind analysis, and causation reporting. • Investigation of numerous residential and multi-family structure wind damage claims resulting from Hurricane Harvey - Gulf Coast. Work included site investigation, wind analysis, and causation reporting. • Structural repair of several precast concrete parking structures - United States. Work is ongoing and includes field investigation, repair development, and construction repair oversight. • Investigation of construction defects in a commercial reinforced concrete turbine pedestal - Ontario. Work included several site investigations, destructive and non- destructive concrete testing, and repair design. • Structural assessment of concrete structures damaged by fire - France and Qatar. Work included site investigation, analysis, and reporting.

Quality Assurance Inspection • Quality control and construction troubleshooting for Department of Defense construction projects - U.K. and Thailand. Work included site observations, design review, and remedial repair development and installation. • Supervised team of engineers performing construction quality and safety investigations at more than 100 reinforced concrete high-rise properties for the City of New York. Work included the development of code modification recommendations to address construction quality and construction safety gaps for the City of New York.

Publications Drengenberg, D. and S. Stacey. 2018. “Investigation and Repair of a Megatall Building Transfer Mat.” Technical Council on Forensic Engineering, ASCE 8th Forensic Engineering Congress.

Corley, W. G. and D. Drengenberg. 2011. “Evolution of Building Code Requirements in a Post 9/11 World.” CTBUH Journal, Issue III.

www.CTLGroup.com Conferences and Seminars David Drengenberg, Drengenberg, D. 2012. “NYC High Rise Construction Study: Structural Integrity and Safety P.E., S.E. During the Construction Phase.” University of Illinois Structural Engineering Conference, Champaign, Illinois. April 17.

Corley, W. G., S. Smith, and D. Drengenberg. 2011. “WTC, Insurance Disputes and Code Changes Ten Years Later.” Construction SuperConference, San Francisco, California. December 16.

Corley, W. G., J. E. Brewe, and D. Drengenberg. 2011. “Building Code Improvements Resulting from World Trade Center and Oklahoma City Attacks.” 9th International Conference on Shock + Impact Loads on Structures. Fukuoka, Japan. November 16-18.

Drengenberg, D. 2011. “High-Rise Safety + Defects in the Big Apple.” Society of Illinois Construction Attorneys, Chicago Bar Association, Chicago, Illinois. May 17

Monitoring Structural Response During Load Tests at a Nuclear Power Plant, Exelon Structural “Construction New York Style: A Case Study of Risk and Responsibility for Site Safety in the Big Apple” CNA Insurance 52nd Annual Meeting of Invited Attorneys

Prior Experience CTLGroup, Skokie, Illinois Senior Structural Engineer, 2016 Senior Engineer, 2010 - 2016 Staff Engineer, 2007 - 2010

Continuing Education • 8th Congress on Forensic Engineering (American Society of Civil Engineers) • Structures Symposium (Structural Engineers Association of Illinois) • Wind load Provisions of ASCE 7 (American Society of Civil Engineers) • Low-rise Building Design for High Winds and Hurricanes (American Society of Civil Engineers) • Structural Building Assessment (American Society of Civil Engineers) • ACI 318-14 Code Seminar (Portland Cement Association) • Napa Earthquake Recommendations Seminar (FEMA) • Wind Load Design I, II, III (American Society of Civil Engineers) • Special Inspections (Precast/Prestressed Concrete Institute)