saddle creek retention treatment...
TRANSCRIPT
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Saddle Creek Retention Treatment Basin
Industry Day
April 26, 2018
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Disclaimer
This presentation is providing information to interested parties and is not contractually binding. City reserves the right to modify or
change as it sees fit.
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Safety Minute
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Project TeamCity Assistant Director: Jim TheilerCity Project Manager: Jake HansenCity Construction Manager: Eitan TsabariCity Administration: Heather Tippey‐Pierce
PMT Facility Coordinator: Scott AuritPMT Compliance Coordinator: Pat NelsonPMT Construction Manager Contact: Kent Bienlien
Design Project Manager: Dave White, Wade TrimDesign Project Engineer: John Weiland, Wade TrimDesign Structural Engineer: Brian Gombos, Wade TrimConstruction Representative: John Arvai, Wade Trim
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Meeting Agenda
MORNING10:00 AM – Introductions10:05 AM – Project History and Overview 10:35 AM – Project Requirements10:45 AM – Procurement and Prequalification11:15 AM ‐ Site Conditions and Risk Elements11:45 AM ‐ Q&A12:00‐1:00 PM – Networking Lunch Break (cafeteria available on‐site)
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Meeting Agenda (cont.)
AFTERNOON1:00 PM – Construction Sequencing 1:30 PM – Concrete Work1:50 PM – Process Overview and Equipment Requirements2:05 PM – Upcoming CSO Program Work2:15 PM – Q&A2:30‐3:30 PM – Visit Project Site
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Design Team
Brown & Caldwell Kirkham MichaelAlley Poyner Macchietto Alvine Engineering Vireo
Lovgren MarketingTerraconJohnna Roberts Emanon Group Associated Engineering
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Wade Trim Background
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RTB Facilities Experience
MI
24
1
3
2
111
2NE
MO
TN
IN OH
PA
NY
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RTB Facilities Experience
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CSO Program and Project History
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City’s Long Term CSO Control Plan
Meeting the increased requirements of the federal Clean Water Act
• Balancing the following needs:
– Compliance
– Affordability
– Acceptance
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Major Elements of FinalLong Term Control Plan
UndergroundStorage Tanks
Targeted Sewer Separation
Green Solutions
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CSO Program Timeline
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Project History
• Original Project Design: 2013‐2015• Bidding: 2015• Value Engineering: 2015‐2016• Early Soils Removal Project: 2016• Redesign: 2017‐2018
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Project Background
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Purpose of the Project
Treat and reduce the volume of combined stormwater and sewage entering the Little Papillion Creek to improve water quality and meet EPA requirements by removing solids from combined sewage and disinfecting flows
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Additional Objectives
• Reduce odors in CSO 205 Channel and Facility Operations
• Replace old grit facility and conveyance sewer
• Provide office space for City staff
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Project Area
MUD
Overflow
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Combined Sewer Overflows
• Overflows occur on average between 50 and 60 days in most years
• As little as 0.10th inch of rain can cause an overflow
Overflow
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CSO 205 Channel
Little Papillion Creek
Existing Grit
Facility
Existing ConditionsTO WASTEWATER TREATMENT PLANT
Papillion Creek Interceptor
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Project Overview
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What is an RTB?
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Saddle Creek RTB Facility
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Site Plan
RTB Outfall
MUD
MUD Parking
RTB Basin
UNO Parking
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CSO 205 Channel
Little Pap
illion Cree
k
To WWTP
Existing Grit
Facility
Saddle Creek Storm Sewer
Improved Conditions
Dewatering Pump Station
Papillion
Creek In
tercep
tor
X
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Underground Tank Compartments
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Facility Fly Over
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Facility Walk Through
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Design Schedule
• 90% Design May 2018• Prequalification June/July 2018• 100% Design September 2018• Advertise for Bid October 2018• Bids Due December 2018
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Construction Schedule
• Construction NTP April 2019• Substantial Completion December 2022• Final Completion June 2023
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Project Requirements
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City of Omaha Requirements
• Contracting License– Class A or B required
• Sales Tax Exemption• Economic Equity and Inclusion Plan (EEIP)
– https://humanrights.cityofomaha.org/economic‐inclusion
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Economic Equity Inclusion Plan
• Small and Emerging Small Business Participation• Workforce Opportunities for Working Age Students and Adults
• Youth Engagement
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Federal Loan Requirements
• WIFIA and SRF Funding• DBE Participation Goals Anticipated
– 6% MBE– 8% WBE– Will be confirmed prior to bid by EPA
• Buy American Iron & Steel• Davis Bacon Wages
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Project Requirements
• General Contractor Self‐Performance Requirement• Escrow of Bidding Documents• Retainage• Allowances• Partnering Meetings• Value Engineering
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Stakeholders
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NRD/USACENRD/USACE
MUD
UNOPARKING
BUSINESSESLOCAL
BUSINESSES
Utilities and Stakeholders
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GAS16” 125#
GASGATEMUD ACCESS
GATE
Metropolitan Utilities District
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Omaha Public Power District
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University of Nebraska‐Omaha
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Papillion Creek – NRD
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US Army Corps of Engineers
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US Army Corps of Engineers
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• Nebraska Department Environmental Quality• City of Omaha Street Maintenance Division• City of Omaha Environmental Services • City of Omaha Planning Department• Douglas County – DOTCOMM• State Fire Marshall
Other
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Procurement Approach
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Procurement Approach
• Step 1 – Prequalification• Step 2 – Lowest Responsible Bid with Pre‐Qualified Prime Contractors
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• Candidate Information• Part 1 – Required Information• Part 2 – Mandatory Criteria• Part 3 – Project References• Part 4 – Technical Criteria
Prequalification Submittal
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Part 1: Required Information• Organizational Structure• History of the Business and Organizational
Performance• Financial Information• Certification of Surety • If a JV, Part 1 Applies to Each Entity of JV
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• Meet Part 2, 3 and 4 Minimum Requirements• If approved, added to Specification as a Prequalified Prime Bidder
Acceptance Criteria
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Part 2: Mandatory Criteria• 7 Questions on Mandatory Requirements• Pass/Fail Criteria• If a JV, Criteria Applies to Each Entity of JV
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Part 2: Mandatory Criteria• Denied performance and bonds from failure to perform adequately
• Terminated for cause by an Owner• Ineligible to bid on or be awarded a public works contract because of prevailing wage or Apprenticeship Program violations
• Convicted of crime involving bidding, award, or performance of government contract
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Part 2: Mandatory Criteria• Liable in court for false claims, material misrepresentation, dishonesty, or fraud against public entity
• Legally debarred from bidding on or being awarded public work or government project
• Bankruptcy
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Part 3: Project References• Three (3) Relevant Projects within Last 10 Years, at least 75% Complete
• Includes Work addressing at least of 3 or 4 of the 8 Technical Criteria (From Part 4)
• Reference Questionnaire Validated by the Owner• If a JV, Criteria Applies to Each Entity of JV
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Part 4: Technical Criteria• Experience in 8 Technical Areas• Submit Project References or Principal Staff References
• Pass/Fail Criteria• If a JV, Criteria Applies to the Combined Experience of the JV
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Part 4: Technical Criteria (cont.)• Single project experience in the construction of water or
wastewater treatment plants in excess of $30M• Single project experience with multi‐disciplined heavy‐civil
construction contracts in excess of $60M• Structural and mass concrete in excess of 15,000 CY within 24
months• Staged and retained deep excavation such as braced sheet pile,
lagged wall, or concrete secant wall construction; with more than 10,000 SF of retained excavation at depths of over 25 vertical feet
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Part 4: Technical Criteria (cont.)• Single project involving more than 10,000 VF of foundation
piling (H‐pile, auger cast, drilled pier, micropile, etc.)• Single project that involves a 2 MG or larger concrete storage
reservoir or tank• Projects requiring stream or flow diversion• Projects with groundwater dewatering for excavations deeper
than 25 feet
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Finalize Pre‐qualification Documents 05/23/18Advertise and Issue RFQ Documents (*) 06/06/18Orientation Meeting and Site Visit 06/13/18Questionnaire Submittals Due 07/11/18Issue Notice of Approvals 08/08/18
* 90% Documents provided
Prequalification Schedule (Tentative)
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Step 2: Lowest Responsible Bid
• Pre‐Qualified Prime Contractors• Project Advertisement • Pre‐Bid• Question and Answers• Potential Addendums• Public Bid Opening
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BIM Model Available
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Bidding Schedule (Tentative)
• Advertise for Bid October 24, 2018• Pre‐Bid Meeting November 7, 2018• Bids Due December 19, 2018
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Site Conditions
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1952 Aerial
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1975 Aerial
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Current Site Conditions
• Active Sewers• Existing Facilities• Floodplain• Geotechnical Conditions
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Active Sewers
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Existing Grit Facility
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Existing Grit Facility
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Existing Grit Facility
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Active Floodplain
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Soil Borings
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Groundwater
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Prior Investigations
• Phase I Environmental Site Assessment and Limited Subsurface Investigation
• Asbestos Survey, Lead‐Based Paint Screening, and Hazardous Building Materials Assessment Report
• Wetland Delineation and Waters of the U.S. Determination
• Biological Survey Update
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Prior Investigations (Cont.)
• Geotechnical Engineering Report• Construction Dewatering Assessment• Geotechnical Report – 64th Avenue Reconstruction
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Site Preparation
• Tree Removal• Construction & Debris (C&D) Removal
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Site Preparation
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MUD Access RoadLittle
Papillion Creek
Removal to 1018
Approximate Groundwater Level
66” InterceptorApprox. Inv. El.: 1002.44
16” HP Gas Main
Site Preparation
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Risk Elements
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Major Project Revisions/Risk Mitigation
• C&D Landfill Debris Removed• 50% Reduction in Tank Size and Layout Adjusted• Dewatering Pump Station Within Main Tank• Storm Event Start Up Testing by Owner• Backup Power by Dual Feed• HVAC System Simplified• Extended the Performance Period
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Risk Elements
• Costs• Schedule• Underground Conditions • Mass Concrete Management • Work in a Floodplain• Maintenance of Sewer Flows
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Little Papio Creek Watershed
• Long, narrow watershed
• Tributary area 55 mi2
• Time to peak: approximately 2 hours
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1 Year Flood
1 YEAR FLOOD
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10 YEAR FLOOD
10 Year Flood
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100 YEAR FLOOD
100 Year Flood
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TO PAPILLION CREEK WWTP
EXISTING SADDLE CREEK STORM SEWER
60” DIVERSION SEWER
PAPILLION CREEK IN
TERCEPTOR (PCI) 66”
NEW FLOW METERING MH
CSO 205 CHANNEL
LITTLE PAPILLION CREEK
3A
3B
1
6
5
4
7
EXISTING 36”/42” SEWER
2 2
EXISTING DUPONT GRIT FACILITY
PCI 60”
Flow Management
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Description
Dry Weather Flow Wet Weather Flow
Condition Flow (MGD)Depth
Condition Flow (MGD)Depth
(ft) (ft)
1 CSO 205 Box Sewers Upstream of Diversion Weir – 2@ 10’x12’
Min. 3.8 0.2 Min. ≥9.0 ≥1.0Avg. 6.4 0.5 Avg. 79 2.5
Peak <9 <1.0TY Peak 874 5.7
10 Yr 1,850 Surcharged
2 Dupont Grit Pit, 36" and 42" Outlet Sewer
Min. 3.8 0.5 Min. ≥9 ≥1.5Avg. 6.4 1 Avg. 16 2.25Peak <9 <1.5 Peak (2) 40 3.5
3A CSO 205 Outfall – 2 @ 10’x12’
Min. N.A. N.A. Min. 0.1 0.1Avg. N.A. N.A. TY Avg. 116 1.4Peak N.A. N.A.
TY Peak 846 5.710 Yr 1,810 10
3B CSO 205 Channel
Min. N.A. (1) Min. 0.1 0.1Avg. N.A. (1) TY Avg. 116 7.2
Peak N.A. (1) TY Peak 846 10.210 Yr 1,810 13.2
4 Papillion Creek Interceptor ‐ 60" (upstream of 42”)
Min. 3 0.2 Min. ≥11.0 ≥0.8Avg. 8 0.6 Avg. 30 2.5Peak <11 <0.8 Peak (2) 65 5
5 Papillion Creek Interceptor ‐ 66" (downstream of 42”)
Min. 6.8 0.6 Min. ≥20.0 ≥1.2Avg. 14.4 1 Avg. 32 2.1Peak <20 <1.2 Peak (2) 84 5
6 UNO Storm Sewer – 36”Min. N.A. N.A. Min. 0.1 0.1Avg. N.A. N.A. Avg. 10 1.5Peak N.A. N.A. Peak (2) 22 3
7 Little Papillion Creek
Min. 3 1.6Min. > 10 > 1.9
3 Month (3) 1,400 9.3
Avg. 7 1.8 1 Yr (3) 3,400 14Peak <10 <1.9
10 Yr (3) 10,300 26100 Yr (3) 16,500 34
Flows and Levels
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MUD Access Road
Little Papillion Creek
Removal to 1018
Approximate Groundwater Level
66” InterceptorApprox. Inv. El.: 1002.44
16” HP Gas Main
Flood Levels
3 month
10 year
100 year
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Flooding Protection Plan
• Means and methods to protect the site, stored materials, equipment and work areas
• Design flood protection measures to a Threshold Event• Sequencing and scheduling details• Procedures for monitoring weather and flood levels• Communications protocol • Cleaning and restoration plans
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Flow Maintenance Plan• Means and methods to maintain dry and wet weather flows through Work areas
• Sequencing and scheduling details • Procedures for monitoring weather/flows/levels until the measures are removed
• Erosion control or other protection measures• Communications protocol • Cleaning plans before and after
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Suggested Construction and Sequencing Considerations
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Mobilization
3355
1122
44
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Working AreaCONSTRUCTION LIMITS
CONSTRUCTION LIMITS
USACE CHANNEL ROW
USACE CHANNEL ROW
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Access and Haul Routes
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Heavy Civil Elements• Dewatering• Temporary Earth Retention System• Excavation• Piling and Rock Anchors• Foundation and Basin Structures• Backfill
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Ground Conditions
El. 980
El. 900
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Hauling and Disposal of Excavated Soils
• Placed on the north staging area to elevate for floodplain control
• Reuse for backfill if determined as suitable• Dispose off site‐ Approved landfill‐ Approved industrial site
• Environmental allowance for any contamination project
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TERS and Excavation
1122
33
44
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Foundations and Base Slab
11
33
22
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Intermediate Structures
11
33
22
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Diversion Sewer
44
11
22
33
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Pump Station ‐ Foundation
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Pump Station at Basin Floor
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Pump Station at Top of Basin
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Pump Station at Grade
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Foundation Below Buildings
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Basin Slab Below Buildings
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Main Basin Areas Below Buildings
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Building Basement Floors
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Building Intermediate Levels
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Building Intermediate Levels
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Buildings Complete
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Diversion Structure
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Influent Sewers
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Site Improvements11
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Concrete Work
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Concrete Placements
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• Requirements for Water Containing Structures– ACI 350– Crack Control– Durability– Joint Spacing– Finish Requirements
Concrete
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Mass Concrete
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Mass ConcreteTemperature Control
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• Mix Design Optimization• Temperature Limitations • Cracking Sensitivity• Performance Criteria
Mass Concrete Design
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• Water cement ratio ~ 0.42• Strength requirement of 5000 psi, 56 days• Required SCM’s
– 25% to 50% Class F fly ash– 40 to 75% GGBFS; or combination
• Temp limits– Max temp in concrete during cure ~ 158 degrees– Temp differential ~ 35 degrees– Max temp of concrete at placement – 90 degrees
• Shrinkage limits
Mass Concrete Performance Criteria
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• Mix Design• Thermal Modeling• Placement Plan• Monitoring Procedures• Methods for Field Control of Temperatures
Thermal Control Plan
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Concrete Supplier Outreach
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• Owner Field QA Testing• Contractor QC Testing• Contractor Thermal Monitoring
• Hydrostatic Leak Testing
Concrete Testing
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• Monitor and Limit Differential and Max temperature
• Limit Thermal Cracking– Mix Design– Mix temp at placement– Insulation– Post‐placement cooling– Placement constraints
Summary of Thermal Crack Control
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Crack Allowance
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Process Overview and Equipment Requirements
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Process Equipment
• Gates – Isolation and Backwater• Screens• Clam Shell• Chemical Storage, Feed Pumps and Mixers• Flushing Gates• Pumps• Ventilation Fans• Odor Control Fans and Units
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Headworks Operations
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Screens
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Lugger Containers
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Chemical Storage
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Chemical Feed System
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Pumping Equipment
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Flushing Reservoirs
Flushing Gates
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Flushing Gates
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Flushing Gates
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Odor Control
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Ventilation Fans and Louvers
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Integration Scope of Services
• Sole Source Procurement Assigned to Prime• Labor• Equipment (PLC and Instrumentation)• Hardware and Software• Programming Services• Testing and Commissioning Support
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Facility Startup/Testing
• Off Site Simulated PLC Testing• Functional Equipment Check Out • On‐Site Simulated Control System and Equipment Functional Testing
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Clean and Dirty Water Facility Performance Testing
• Clean Water Test• Dirty Water Test
– Diversion System– Dry Weather Grit Pit– Dewatering Pumping System– Flushing Systems
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Owner Wet Weather Startup/Testing
• By Owner, after Substantial Completion• Using Real Chemicals• During Real Storm Events• Overall assessment of the system working performance and ability to meet permit requirements
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Upcoming CSO Program Work
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CSO Program Schedule
http://omahacso.com/resources/contractors‐corner/
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CSO Program Progress
Categories April 2018 Costs
Completed Projects $287,314,669
Projects in Bid/Construction $118,904,702
Projects in Design $209,100,345
Paid Out for Construction To‐Date $377,313,898
• Program Implementation Started in 2009• Current Program Estimated Cost is $2B
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Additional CSO Facility Projects2018• April 2018 – Burt‐Izard Lift Station• July/Aug 2018 – Riverview Lift Station• 3 other sewer separation projectsFuture Facility Projects• Monroe Lift Station Improvements• Deep Tunnel Diversion/Grit Facilities• Deep Tunnel Lift Station• Deep Tunnel RTB• CSO Storage Tanks
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Other Facility Projects• City of Omaha Master Plan for the WRRFs• MRWRRF (Missouri River Water Resource Recovery Facility)
Improvements• PCWRRF (Papillion Creek Water Resource Recovery Facility)
Improvements
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OmahaCSO.com Contractor’s Corner
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Questions and Open Discussion
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Project Website: http://www.omahacso.com/projects/saddlecreekrtb/
Project Factsheet and Contractor’s Corner Sheets
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Questions / Contacts
• Dave White, Wade Trim – [email protected]– 317‐517‐4603
• Jake Hansen, City of Omaha– [email protected]– 402‐444‐3922 ext. 2202
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Site Visit