Lake Delhi Dam Reconstruction Design Alternatives Report - Iowa

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Lake Delhi Dam ReconstructionDesign Alternatives ReportLake Delhi Combined Recreational Facilityand Water Quality DistrictTransportation, Infrastructure, and CapitalsAppropriations Subcommittee PresentationFebruary 2, 2012

Alternatives Report Presentation Agenda:I.IntroductionII.Project ObjectivesIII.Facility DescriptionIV.Field Investigation and Data CollectionV.Engineering AnalysisVI.Hazard ClassificationVII. Repair Alternatives Development andEvaluationVIII. Recommended ProjectIX.Construction Schedule/PhasingX.Construction Cost EstimateXI.Moving ForwardXII. Questions

I. IntroductionProject Team Stanley Consultants Gibbs Engineering and Surveying Braun INTERTEC Louis Berger Group Lake Delhi Combined RecreationalFacility and Water Quality District

II. Project Objectives Document Condition of Lake Delhi Dam Collect Data to Perform Technical Analysis andDesign of Dam Repairs Review Regulatory Requirements Complete Archaeological Reconnaissance Develop and Evaluate Alternatives for RepairingLake Delhi Dam Provide “Recommended Project”, Bringing Dam IntoCompliance with Current Dam Safety Standards. Provide Estimate of Construction Costs andSchedule.

III. Description of Existing FacilityFeatures Pool Area North Embankment North Abutment Wall Powerhouse Gated Spillway Stilling Basin South Buttress Wall South Embankment

IV. Field Investigation and DataCollection Document ReviewTopographic SurveyProperty ResearchGeotechnical InvestigationsStructural InvestigationsElectrical InvestigationsMechanical InvestigationsArcheological ReconnaissancePermitting Requirements Review

Document Review Original Design Drawings Repair Drawings/Specifications 1997 Ashton-Barnes Inspection, Stability, andSpillway Adequacy Report 2002 J.F. Brennan Co. Underwater InspectionReport and Videos 2004 DNR Inspection Report 2008 J.F. Brennan Co. Underwater InspectionReport and Videos 2009 DNR Inspection Report 2010 Stanley Consultants Inspection Report

Topographic Survey & Property Research Topographic Survey– Complete survey of Project Area – Gibbs– Supplement With Light Detection and Ranging (LiDar) Property Research – Gibbs–––––––Review Gibb’s Previous SurveysReview Gibb’s Previous Computer DrawingsGenerate Property Line Exhibit Compiling Previous WorkConduct Research at County CourthouseAdd In Geometry of Missing PlatsObtained Coordinates of accessible property pinsCompare Surveyed Property Pins to Property line exhibitand adjust Future Property Work

Geotechnical Investigations Field Investigations–Dam Site–Potential Borrow Evaluation–Laboratory Testing Geotechnical Parameter Development

Structural Investigations Initial Field Investigations–Concrete Condition Survey–Concrete Cores Review 1997 Ashton-Barnes StructuralStability Analyses Supplemental Investigations–Powerhouse/Spillway FoundationCoring

Electrical Investigations Power Distribution Trash Rakes and Hydroelectric Equipment Lift Gates Emergency Generator System

Mechanical Investigations Lift Gates Wicket Gates Trash Rake

Archeological Reconnaissance Louis Berger Group, Inc. (LBG) Reconnaissance Level Survey Reconnaissance included Lake Delhi Dam and all Exposedland areas within the former impoundment area Records review to identify high potential areas Field survey to investigate High potential areas Seven New Sites Within Study Area Total of 12 archaeological sites reported for the study area No burial sites were identified within the study area None of 12 sites has been evaluated for National Register Additional site investigations recommended at all 12 Additional reconnaissance survey recommended forselected portions of the study area

Permitting Requirements Review U.S. Army Corps of Engineers - Section 404Nationwide Permit (NWP) Iowa DNR – Section 401 Water QualityCertification Iowa DNR – Sovereign Lands ConstructionPermit Iowa DNR – Floodplain Development Permit Cultural Resources U. S. Fish and Wildlife Service (FWS)

V. Engineering Analysis GeotechnicalStructuralHydrology/HydraulicsHazard Classification

Geotechnical Analyses Slope StabilitySeepageBearing CapacitySettlementRock Anchor CapacityErosion/Scour Protection

Structural Analyses Structural Stability Analyses Preliminary Structure StabilizationDesign Preliminary Concrete Structure Design– Service and Auxiliary Spillways– Training/Retaining Walls– Concrete Repair

Hydrology/Hydraulics Lake Delhi Dam did not have sufficient hydraulic capacityto meet current Iowa dam safety criteria. Characterize Maquoketa River Flows at Dam. Developing a hydrologic model of Delhi Dam watershed. Developing a hydraulic model of Maquoketa Riverupstream and downstream of Lake Delhi Dam. Performing hazard classification and design flood analysis Developing Lake Delhi Dam spillway concepts. Addressing other hydraulic issues.– Minimum Flow– Cofferdam By-Pass– Lake Draw-Down

Pool Impacts of Dam

VI. Hazard Classification Low/Moderate/High Impacts Spillway Capacity/Cost of New Project A detailed hazard classification analysis wascompleted and results indicate that a reconstructedLake Delhi Dam most closely matches the DNR’sModerate Hazard Classification. Reviewed by Iowa DNR Included in Dam Construction Permit Application

VII. Repair AlternativesDevelopment and Evaluation Alternative Development/EvaluationProcess Project Features With MultipleAlternatives Project Features Without Alternatives

Alternative Development/EvaluationProcess “Brain Storming” session. Establish District Objectives. Review parameters for designdevelopment and alternative evaluation. Initiate the creative “brain storming”process for alternative development.

Alternative Development/EvaluationProcess (Cont’d) District Objectives Meet requirements of current dam safety and design standards.Minimize operation/maintenance requirements.Maintain or improve upstream and downstream flow conditions.Provide adequate (50 year) service life.Increase public safety at dam site.Improve public recreational opportunities.Reduce potential for damage from debris flow.Provide cost-effective solution.Constructability.Minimize right-of-way impacts.Minimize permitting requirements.Provide opportunity for greater pool control.Enhance fisheries opportunities.Improve water quality.

Alternative Development/Evaluation Process(Cont’d) Brain-Storm Potential ReconstructionAlternatives Review brain-stormed alternatives in terms ofProject Objectives and Feasibility ofConstruction Select Alternatives for Continued Development Complete Conceptual Design of SelectedAlternatives

Project Features With One or More FeasibleAlternatives North Embankment Double Sheet Pile Wall Cellular Sheet Pile Structure Reinforced Concrete Walls * North Downstream Abutment Wall Leave the existing wall as-is Remove and replace the masonry block portion of the wallwith large block or mechanically stabilized earth (MSE)wall * Remove and replace the masonry block portion of the wallwith a reinforced concrete wall

Project Features With One or MoreFeasible Alternatives (Cont’d) Powerhouse/Spillway Stabilization FERC Stability Requirements U.S. Army Corps of Engineers Stability Requirements * Powerhouse Bridge Deck Epoxy Seal Waterproof Membrane * Spillway Gate Repair/Replacement Radial Gates Crest Gates Lift Gates *

Project Features With One or More FeasibleAlternatives (Cont’d) New Spillway Fuse PlugAdd Additional Lift or Radial GatesConduit Spillway Through EmbankmentLabyrinth Weir Dual Level Single Level * Pneumatic Crest Gates Minimum Flow Passage Refurbish Wicket Gates Install Valves in New Lift Gates *

Project Features With One or MoreFeasible Alternatives (Cont’d) New South Spillway Embankment Construction Homogeneous Earth Zoned * Roller Compacted Concrete (RCC) Existing South Embankment Remove and Replace Improve Existing and Bench Into New *

Option Features Fish Passage Recommendation – Not Practical Cost Maintenance Property Impacts Length Invasive Species Dam Safety

Option Features (Cont’d) Recreational Amenities Handicapped Accessible Fishing Pier.Canoe Portage Trail.Boat Ramp.Observation Deck. Sediment Control and Removal Dredging During Construction Sediment Control Features

Non-Alternative/Option Project Features Site Access Utilities Powerhouse/Spillway Concrete Repair South Buttress Wall Modification/Repair Electrical and Controls Safety Features Archeological Mitigation Property/Easement Acquisition

VII. Recommended Project Based on the project objective evaluationand cost comparison, reconstructionalternatives were selected for incorporationinto the “recommended project.” “Recommended Alternatives” werecombined with Non-Alternative Featuresfor “Recommended Project”

IX. Construction Schedule/Phasing Goal – Pool in 2013 Recommend Two Phase Construction Preliminary scheduling - construction could be accomplishedin one construction season Assumptions Experienced contractor with sufficient resources Normal weather Normal river flows Normal permitting timeline 6 day work week

Phase I

Phase II

X. Construction Cost Estimate Combine Costs Estimates for Recommended AlternativesNon-Alternative Item Cost EstimatesDesign and Engineering During Construction CostsUnit Costs Based on Published Values and Stanley DataBase Apply Mark-Ups Undeveloped Design Costs Construction Contingencies Escalation for Inflation Recommended Project:Approximately 11.9 million

XI. Moving Forward Present Alternative Report to Agencies Initiate Detailed Design and Preparation ofContract Documents Permitting and Agency Coordination Property/Easement Acquisition Identify Qualified Contractors Bid Project Construction

XII. Questions ?

1997 Ashton-Barnes Inspection, Stability, and Spillway Adequacy Report 2002 J.F. Brennan Co. Underwater Inspection Report and Videos 2004 DNR Inspection Report 2008 J.F. Brennan Co. Underwater Inspection Report and Videos 2009 DNR Inspection Report 2010 Stanley Consultants Inspection Report

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