Lake Bemidji South Shore Restoration and Enhancement

Transcription

1 Lake Bemidji South Shore Restoration and Enhancement Craig Gray, PE Director of Public Works & City Engineer Sherry Van Duyn, PE, CHMM Senior Civil Engineer 1

2 Project Location 2

3 Former Lake Uses Logging and sawmill operations ~ Superwood Corp/Nuply/ Georgia Pacific (hardboard manufacturer) 1940s Youth Conservation Corp constructed beach house, also later used by Nuply and then ShoreQuest Development as office Property currently owned by Bemidji Economic Development Association 3

4 Past Cleanup & Restoration City and DEED cleaned up 50 acres for Sanford Center DNR extended the Paul Bunyan State Trail Eastern shoreline parcel sold to DNR for an Aquatic Management Area Next: South Shore Beach Cleanup 4

5 Proposed Development First Plan

6 Proposed Development Current Plan 6

7 Project Timeline Multiple Environmental Investigations, Grants, Permits and Assessments Phase II Investigation Apex Environmental February 2005 Phase II Investigation for DNR on Sediments Barr Engineering December 2007 Phase II Investigation Widseth Smith Nolting May 2011 DRAP Addendum, Design, Permitting Landmark Environmental & Anderson Engineering LSOHC Grant Application and Award June 2014 June October 2006 Phase I Investigation for DNR Service Engineering Group July 2008 Alternative Urban Areawide Review WSN, Bonestroo, & Archaeological Research Services October 2011 Development Response Action Plan (DRAP) Widseth Smith Nolting June 2013 Debris Investigation by City May 2015 Design Changes for Grant Late August 2015 Construction Start

8 Finding and Obtaining Public Grant Funding CITY Funded Design, Permitting, Cost estimating Would require raising taxes, city voted no DEED Denied, significant grants awarded to neighboring project No significant increase in new jobs US EPA Brownfields Didn t qualify Phase I hadn t been completed on property before purchase Outdoor Heritage Fund Granted for purposes of improving aquatic and waterfowl habitats 8

9 Bring in regulators and stakeholders early Invited environmental agencies to preliminary design meeting to get input for project and kept up to date through project U.S. Army Corps of Engineers Minnesota Department of Natural Resources Minnesota Pollution Control Agency Greater Bemidji Area Joint Planning Board 9

10 Current Conditions

11 Current Conditions 11

12 Current Conditions 12

13 Current Conditions 13

14 Wood Debris Wood debris ranging in size from sawdust to planks and logs Debris extends into the lake up to 175 feet Cleanup will involve 1440 feet of shoreline Cleanup totals 5.5 acres of lake bottom 14

15 Environmental Issues Multiple investigations completed over last 10 years Soil, sediment, groundwater, surface water, wood debris sampled for wide variety of contaminants Two contaminated areas identified Soil with polynuclear aromatic hydrocarbons (PAHs) Sediment area with arsenic Wood debris had low levels of formaldehyde Groundwater has low levels of formaldehyde but MPCA deemed meets use goals Debris in lake delineated DNR Assessment 2014 Vegetation requires substantial cleanup and restoration to improve water quality, habitat and erosion control 15

16 Design Plans Wood debris removal area excavated and backfilled with screened clean sand from onsite borrow area Cofferdam Limits Sand beach area Borrow & Spoil Area 16

17 1440 Beach Onsite clean sand from borrow area screened and placed as backfill in lake in excavated area (1440 ft by 200 ft). Thickness not to exceed excavated depth (average 1 ft.). Beach raked and import clean sand placed in sand beach area.

18 Restore, Enhance, & Educate Remove wood debris and contamination Restore with native vegetation and erosion control to stabilize shoreline Addresses water quality and aquatic habitat Restores lake bottom for high quality fish (walleye, pike, perch, muskie) Provides public education on water quality and aquatic restoration work

19 Outcome & Benefits Collaborative effort to: Cleanup and restore 5.5 acres of the lake and 3 acres of shoreline from former industrial uses Restore and enhance native vegetation Improve water quality Improve aquatic habitat Connect people to the outdoors Educate on water quality and restoration 19

20 Summary of Restoration & Enhancement Construct water barrier type cofferdam and dewater area Excavate wood debris and contaminated sediment area from lake and along shoreline Excavate contaminated soil area next to building. Contaminated soil and sediment will be properly disposed at Polk County landfill. Backfill clean screened sand from onsite borrow area into lake (sand will replace excavated areas to depth excavated or slightly less thickness of debris estimated to be 1 thick on average, so backfill clean sand up to 1 thick or slightly less and grade to slope) Mechanically screen wood and haul to local companies to process or use as mulch Remaining sand/debris to be placed onsite at depth north of bike trail. Sand will be excavated from this area and reused as fill in lake (soil swap). Replace topsoil and seed. Regrade and rake beach area Restore native vegetation. Remove weeds, install native vegetation, weed control, erosion control 20

21 Construction Planning -Preliminary Cost Estimate & Schedule Contractor Estimates (Bolander, Belair, Veit) Best cost is by unit price, so exact cost isn t known until completion. Volumes estimated by engineer for the bid form based on previous investigations Construction required low lake levels and non fish-spawning season. Construction estimated to take 2 months Requires closing and rerouting bike trail Extensive permit process

22 Permits Required Extensive Permits and Coordination with Multiple Agencies DNR Public Waters Works Permit Army Corps Permit MPCA Section 401 Certification Environmental Review Need Determination by Local Government Unit GBAJPB Response Action Plan Addendum to MPCA MPCA Beneficial Reuse Determination for reuse of wood debris as mulch DNR Water Appropriations Permit for dewatering Submit prior to construction MPCA Construction National Pollutant Discharge Elimination System Stormwater Permit Submit at start of construction 22

23 Schedule Activity Approximate Date Award Contract July 2015 (Start of Funding) Start Cleanup, Restoration and August 2015 Enhancement Temporary Cofferdam September 2015 Installation and Dewatering Contaminated Soil Removal and October 2015 Wood Debris Screening Grading & Site Restoration Late October 2015 Native Landscape Planting May 2016 Regional Park Development Summer

24 TOTAL COSTS Restoration and Enhancement Lake Bemidji South Shore Construction Costs Grant Award Bid Award Actual $1,400,000 $1,176,000 In Process Restoration $150,000 In Process Engineering Oversight, Permits, MPCA, City $100,000 $134,000 In Process Total Costs $1,650,000 1,310,000 TBD

25 Grant Requirements Grant Applications Multiple grants may be necessary Award of Grant Grant Agreements Grant Fund Use Timing Work Plans Reporting and Submittals to Grant Agency Disbursement Process Audits & Inspections 25

26 Construction Site Preparation August

27 Installing the AquaBarrier September

28 Cofferdam Installation Water barrier cofferdam structure AquaBarrier water filled bladder system Decontamination Not enough sections arrived on site Failure of a section, project on hold 28

29 AquaBarrier Cofferdam 29

30 Regulatory Compliance & Permit Conditions DNR Decontamination procedures for Aquatic Invasive Species Water discharge permit reporting Fish relocation Army Corps work in water, effluent standards, restoration MPCA beneficial reuse, contamination, dewatering plan and discharge standards 30

31 Dewatering the Project Area 31

32 Excavating Along the Shoreline 32

33 Excavating Along the Shoreline 33

34 Borrow and Spoil Area 34

35 Staging Areas 35

36 Soil Contamination Polynuclear Aromatic Hydrocarbon Arsenic Clay pigeons (petroleum pitch) 36

37 Be Flexible When Challenges Arise Endangered species habitat Watch for archaeological discoveries Things don t always go according to plan Northern Long-Eared Brown Bat Earthen dam extension to cofferdam 37

38 Conclusions Start early - Planning takes time and money Multiple environmental investigations and assessments Engage the public, use local resources Conduct surveys to gauge public opinion Multiple site uses appeal to many Include the regulators and project stakeholders from the beginning Look and apply for available public funding (may need multiple sources) Get creative on engineering design Be flexible, projects change and don t always go as planned 38