Osborn Engineering MedMart Project Convention Center Foundation Analysis March 5, 2009

Osborn Background Founded in 1892/ Cleveland FirmFounded in 1892/ Cleveland Firm Commitment to Client-Oriented ServiceCommitment to Client-Oriented Service Staff Size: 70Staff Size: 70 Engineering Disciplines:Engineering Disciplines: –Structural –Civil –Electrical –Mechanical –Fire Protection –Energy Efficiency Notable Cleveland Project ExperienceNotable Cleveland Project Experience

Osborn Experience 2005 & 2008 Mall Site Concepts Convention Center Studies Since 1998 Analysis of Society For Savings Bank Renovation Cleveland Browns Stadium Progressive Field Williard Park Garage Analysis Burke Airport Vibration

Scope Of The Study Project Scope Understand the MMPI Concept Soil and Material Testing Analyze Existing Foundation System Determine the Feasibility of Reusing Existing FoundationDetermine the Feasibility of Reusing Existing Foundation Analyze Potential Impact on Adjacent BuildingsAnalyze Potential Impact on Adjacent Buildings

Study Process Workshops with MMPI, County & City Independent Soils and Material Testing Extensive Review of Existing Convention Center Independent Review of Project Approach Develop Our Own Design Determine Feasibility of Reusing Foundation Assess Risks

Significant Findings Condition and Strength of Mat Foundation is Very Sound Concrete Testing Very Positive Chloride-Ion Results Not A Problem Reinforcing Steel Looks New

Significant Findings Soil Conditions Are As Expected Cleveland’s Blue Clay 150 Ft. To Bedrock Can Continue To Support Convention Center

Significant Findings No Water Concerns Static Water Table 25 Ft. Below Foundation Existing Dewatering System Is Efficient No Water Infiltration No Geyser!

Mat Foundation Can Support New Structure New Loads Are Less Than Existing Loads Can Use Footers Or Caissons Recommended To Use Caissons Cost Premium Of < $2 Mil. Significant Findings

Very Little Risk To Surrounding Buildings Re-use Continues To Support Surrounding Areas Recommend Wall Anchors

Significant Findings Existing Structure Supporting Lakeside Ave. Can Continue To Be Used

Mall Level Can Be Maintained Within Existing Parameters, or Less Top of Existing Wall Around Mall

Osborn Engineering MedMart Project Convention Center Foundation Analysis March 5, 2009