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Home My WebLink AboutCOW 2008-09-08 Item 3B - Discussion - Seismic Evaluation Results by Reid Middleton COUNCIL AGENDA SYNOPSIS [t i y Initials ITEM No. g Meeting Date Prepared by Mayor's review l Council review 1 09/08/08 1 3M MC 1 1 I1 iv rsoa b ITEM INFORMATION I CAS NUMBER: 08-110 I ORIGINAL AGENDA DATE: SEPTEMBER 8, 2008 AGENDA ITEM TITLE Seismic Evaluation Results Presentation CATEGORY Discussion Motion Resolution Ordinance ❑Bid Award Public Hearing Other Mtg Date 09/08/08 Mtg Date Mtg Date i11tg Date Mtg Date Mtg Date ivitg Date: SPONSOR Council Mayor Adm Svcs DCD Finance Fire Legal P&R Police PW SPONSOR'S Reid Middleton was contracted to provide Seismic Evaluations for eleven City buildings; SUMMARY City Hall, 6300 Bldg, 4 Fire Stations, Tukwila Community Center, George Long, and Minkler Shops (three buildings). All of the buildings, with the exception of Fire Station 53 (built in 1995) do not meet the Immediate Occupancy Objective. Concept -level seismic upgrade designs will be presented along with cost estimates. REVthWED BY COW Mtg. CA &P Cmte F &S Cmte Transportation Cmte Utilities Cmte Arts Comm. Parks Comm. Planning Comm. DA'Z'E: 09/03/08 RECOMMENDATIONS: SPONSOR /ADMI\N. Information only at this time. COMfIrTEE Unanimous approval; forward to COW for discussion. COST IMPACT 1 FUND SOURCE EXPENDITURE REQUIRED AMOUNT BUDGETED APPROPRIATION REQUIRED $0.00 $0.00 $0.00 Fund Source: Comments: 1 MTG. DATE I RECORD OF COUNCIL ACTION I 09/08/08 1 MTG. DATE I ATTACHMENTS 09/08/08 1 Information Memo dated September 3, 2008 (revised after 9/3/08 F&S meeting) I 1 Power Point Presentation Finance Safety Committee Meeting Minutes from September 3, 2008 (Please bring your copy of the Seismic Report distributed previously) 1 1 COPIES OF THE PRESENTATION SLIDES TO BE PROVIDED SEPARATELY INFORMATIONAL MEMORANDUM To: Mayor Haggerton From: Public Works Director Date: September 3, 2008 Subject: Seismic Hazards Screening Report PLEASE BRING YOUR COPY OF THE EVALUATION REPORT ISSUE: Review the results of the Seismic Hazards Screening Evaluation. DISCUSSION: After a preliminary evaluation, Reid Middleton was contracted to provide Seismic Hazard Screening and Reporting services, using FEMA 154 and ASCE 31 -03 screening criteria for nine City buildings (Minkler Maintenance Shops were divided into three separate buildings). Reid Middleton's effort evaluated the building's structural performance for the Immediate Occupancy objective. The Immediate Occupancy performance objective was chosen because each of the buildings being evaluated provide a critical function or service that will be needed by the community either during a disaster or the long recovery period immediately following the disaster. All of the buildings, with the exception of Fire Station 53, were found to have serious seismic deficiencies, do not meet the Immediate Occupancy Objective, and more than likely would not be able to provide the service or function required. Concept -level seismic upgrade designs have been completed and are included in the report. These designs describe the options to mitigate structural deficiencies. Cost estimates for the concept -level upgrades have also been developed. RECOMMENDATION: Present to the Committee of the Whole for consideration. PLEASE BRING YOUR COPY OF THE EVALUATION REPORT City of Tukwila a: ce' a Finance Safety Committee isoa FINANCE AND SAFETY COMMITTEE Meeting Minutes September 3, 2008 5:00 p. nz. PRESENT Councilmembers: Dennis Robertson, Chair; Pam Linder and Kathy Hougardy Staff: Jim Morrow, Bob Noland, Chris Flores, David Haynes, Chris Flores, Rhonda Berry, Christy O'Flaherty and Kimberly Matej Guests: Corbin Hammer, Project Engineer and Dave Swanson, Principal with Reid Middleton, Inc. CALL TO ORDER: Committee Chair Robertson called the meeting to order at 5:10 p.m. I. PRESENTATIONS No presentations. II. BUSINESS AGENDA A. Seismic Evaluation Results Presentation Committee Chair Robertson stated that due to the size and complexity of the Seismic Hazards Screening Report, he would like to have the Committee focus on the basic report and its content. After that information has been presented, the Committee can move forward to a discussion of recommendations of from the consultant as well as staff. Representatives from Reid Middleton, Inc. gave a PowerPoint presentation to discuss the seismic evaluation results with the Committee. Dave Swanson discussed the extreme uncertainty of earthquake engineering, but stated that the seismic study results are fairly certain. The overall intent of the report will explain the current condition of the assessed facilities today. The presentation will lay the groundwork for actual seismic report. The presentation included an overview of the following: e Facilities and Importance o Considered facilities that provide critical services or functions to the City. o Assessed 11 City buildings. o Function and operational compared to immediate occupancy. o Threat potential of three types of earthquakes. e Project Approach Displacement- based, which is a standard approach used for existing buildings. o Applied Technology Council 21 Visual Screening Procedure Basic, conducted in between 1 -3 hours. Results caused the City to move further into seismic evaluation. o American Society of Civil Engineers 31 -03 Detailed Seismic Evaluations Minimum standard. Three tiers, each of which gets more complex. o American Society of Civil Engineers 41 -06 Performance Based Design Determining objectives, establishing a budget and designing a building for upgrade. Rapid Visual Seismic Screening Results o Provides relative rank and structural scores for each assessed building based on very basic visual screenings. Detailed report leads to different ranks and assessments. e Detailed Seismic Evaluation Results o Overviewed each building individually. Significant detail provided in full report. e Concept -Level Seismic Upgrades o Provided structural upgrade /retrofit or replacements recommendations for each facility. e Cost Estimates Finance Safety Committee Minutes Seotember 3, 2008 Pace 2 After a lengthy discussion regarding the study, the Committee recommended forwarding the presentation to the September 8 COW as an information only item. Due to the complexity, relative importance and potential costs associated with the seismic report, the Committee recommended the item be discussed at two separate Council meetings. The first meeting would focus on presentation of the report material followed by a second meeting which would focus on the recommendations resulting from the report. Several suggestions were made by Committee members to make the presentation material easier to understand at full Council. The Committee determined it will be clearer to separate the Facility Report (page 61 of the Committee Agenda packet) into two separate charts. One chart will concentrate on the Reid Middleton recommendations focusing only on retrofit, upgrades and replacement recommendations and costs. The second chart will add other factors for consideration elaborating on staff recommendations based on identified facility improvement needs, overall cost and timing issues. The inclusion of this additional information is essential in providing a big picture/high level view of encompassing the needs of the assessed City facilities. This item will return to Committee at a later date for presentation and discussion of staff's recommended actions, and will then return to full Council. FORWARD TO SEPTEMBER 8 COW FOR PRESENTATION AS INFORMATION ONLY AT THIS TIIIE. ITEM WILL RETURN TO COMMITTEE FOR FURTHER/ADDITIONAL CONSIDERATION. F. 2008 Second Ouarter Reports Item removed from current agenda per Committee Chair. III. ANNOUNCEMENTS No announcements. IV. MISCELLANEOUS Meeting adjourned at 7:45 p.m. Next meeting: Tuesday, September 16, 2008 5:00 p.m. Conference Room 3 Committee Chair Approval Minutes y KAM.