Integrating Design & Construction Ann Arbor Wastewater Treatment Plant Facilities Renovations Project
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1 Integrating Design & Construction Ann Arbor Wastewater Treatment Plant Facilities Renovations Project Presenters: Earl J. Kenzie, P.E. Ann Arbor Chris Englert, P.E. Englert Engin. Thomas Porter ARCADIS Imagine the result 1 2 July 2015 ARCADIS
2 The Seven Ps The Benefits of Integrating Design and Construction for a Complex Project OR. Prior Proper Planning Prevents Piss Poor Performance
3 City of Ann Arbor WWTP Permitted capacity MGD Average daily flow 16.6 MGD Maximum hydraulic flow 48 MGD
4 City of Ann Arbor WWTP Treatment Processes Liquid Treatment Primary Physical Secondary Biological Chemical Physical Tertiary Physical Disinfection Ultra-violet (UV) Solids Removal Screenings Grit Fats, oils & grease (FOG) Biosolids Lime stabilization and subsurface land application Centrifuge dewatering and landfill disposal
5 Plant Layout Newer East Plant 20 mgd 1977 Old West Plant 9.5 mgd
6 City of Ann Arbor WWTP
7 Facilities Renovations Project Construction Schedule Notice to Proceed: June 2012 West Plant Start-up: October 2015 Project Completion: September 2017 Construction Budget Approximately $96 million (currently)
8 Project Features Two new treatment passes including primary settling tanks, aeration tanks and secondary settling tanks Flow splitter improvements New plant wide electrical distribution system New stand-by electrical generators New Administration Building Replace East Plant blowers Miscellaneous East Plant improvements
9 WWTP Site Limitations Norfolk Southern RR Access Road Huron River Fleming Creek
10 Project Challenges Emphasis during design and construction is the Maintenance Of Plant Operations (MOPO) Integration of Design and Construction
11 Project Challenges Maintenance Of Plant Operations Construction Sequencing & Staging FEMA Flood Plain Issues Geotechnical Geotechnical Instrumentation Artesian Dewatering Deep Excavations Near Existing Operating Plant Facilities Electrical Complete Replacement of Electrical Distribution System
12 Construction Sequencing During Design
13 Construction Sequencing During Design
14 Stage 1 - Construction Sequence During Design
15 Stage 2 - Construction Sequence During Design
16 Stage 3 - Construction Sequence During Design
17 Stage 4 - Construction Sequence During Design
18 Stage 5 - Construction Sequence During Design
19 FEMA Impacts to Project Schedule Embankment History Embankment Improvements before FRP could proceed Site Embankment Improvements FEMA CLOMR / LOMR Process
20 1980 FIRM Before Embankment Improvements FEMA Identified 500-year Floodplain FEMA Identified 100-year Floodplain FEMA Identified Floodway
21 2014 FIRM After Embankment Improvements Modeled 500-year Floodplain Modeled 100-year Floodplain Modeled Floodway
22 Geotechnical Challenges Geotechnical Instrumentation to Monitor Existing Structures During Construction Site-wide Artesian Conditions and Depressurization Before Construction Excavation & Construction Near Existing Operational Structures
23 Geotechnical Instrumentation Instruments Inclinometers Monitoring Points and Ground Surface Markers Telltales Monitoring Wells Piezometers
24 Artesian Dewatering
25 Artesian Dewatering #6
26 Artesian Dewatering #7
27 Earth Retention Adjacent to Operating Facilities
28 Earth Retention Adjacent to Operating Facilities
29 Earth Retention Adjacent to Operating Facilities #3
30 Electrical Sequencing Replacement of the entire electrical distribution system Maintain a primary and redundant power source throughout construction and startup Significant electrical sequencing specified in the contract documents and executed during construction
31 Central Electrical Building (CEB)
32 CEB Primary Switch Gear Room
33 CEB Generator Room
34 Drone View of West Plant Construction
35 Preparation for Startup Training Commissioning Wet Test Seeding Plan Demonstration Test Go
36 Questions & Discussion 36 2 July 2015 ARCADIS
Ann Arbor Wastewater Treatment Plant Facilities Renovations Project October 2017
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