1. Update on Canal Restoration Demonstration Projects and Related Issues July 15, 2014 Prepared by AMEC Environment & Infrastructure, Inc

2. 2 Update on DEP Grant for Sediment Characterization and Design/Permit of Geiger Key Culvert  Grant Paperwork signed December 16, 2013  Two Major Tasks in the Grant Scope:  Additional characterization of sediments at two demonstration projects selected for organic removal – #266 Doctors Arm BPK and #290 Ave J BPK  Design and permit of 3 rd ranked demonstration canal for culvert installation to enhance natural flushing – #472 Geiger Key, Geiger Mobile Homes

3. 3 Update on DEP Grant Sediment Characterization  Nine cores collected in each canal for detailed field logging and laboratory testing to refine removal volumes  Organic material found to top of limerock  6 feet of organics (top of sediment at ~-6 MLW)  Estimated volumes – #266 8,300 cubic yards – #290 4,700 cubic yards – 4-5 x higher than from dual frequency survey data estimates  Laboratory Testing  Physical Testing ( Organic Content/Grain Size Distribution)  Polymer Testing for dewatering  Chemical Testing for disposal (#290 only) – Arsenic 8.2 mg/kg and Copper 540 mg/kg (slightly above Residential SCTLs) – #266 previously tested as clean fill

4. 4 Update on DEP Grant for Design/Permit of Geiger Key Culvert  Design and Permit a culvert to connect canals #472 and #470 under Boca Chica Road  Field work completed in December 2013  Topographic and bathymetric survey  Benthic and threatened and endangered species surveys – no sensitive resources will be impacted  Geotechnical soil borings  Tidal study  Engineering site condition survey  Preliminary Design Plans including a Hydraulic Evaluation Report completed by February 17  Report approved by DEP State Hydrographic Engineer (Mariano Guardo)

5. 5 Update on DEP Grant for Design/Permit of Geiger Key Culvert (con’t)  Pre-application permitting meetings with Canal Restoration Designated Regulatory Staff completed by February 28, 2014  SFWMD ERP – Trisha Stone – Several General Permits (GP) could apply to the canal restorations – GP for Environmental Restoration or Enhancement projects (62- 330.31), if qualify. No mitigation required. – Culvert for Geiger Key meets criteria for Minor Activities within Existing County ROW (GP 62-330.447(1)(c))  USACE – Ivan Fannin & NOAA Fisheries – Brandon Howard – Construction methodology key to determining ‘no effect’ and if a Section 7 Consultation is required  FKNMS – Joanne Delaney – Reviewed benthic survey protocols  Monroe County ROW/Building Permits – Submitted by construction contractor

6. 6 Update on DEP Grant for Design/Permit of Geiger Key Culvert (con’t)  Final Designs completed and submitted with permit applications by April 8, 2014  All Permits Received within 35 days  SFWMD ERP General Permit - April 25, 2014  USACE Nationwide (NW) 7 - May 13, 2014 – NW 7 – Outfall Structures and Associated Intake Structures  FKNMS - May 2, 2014  Construction Plans with Technical Specifications submitted June 6 ready for bidding  Estimated Engineering Construction Cost $90,000 - $107,000  All deliverables submitted on, or ahead of schedule, within budget. SFWMD ERP 44-00-560-P SAJ-2014-01041 (NW-IF) FKNMS-2014-061

7. 7 Update on Monroe County Demonstration Projects  AMEC was approved to start work for the design and permitting of 6 Monroe County demonstration projects on May 21, 2014  Four different technologies being evaluated separately; one combination Weed BarriersOrganic Removal Culvert Installation PumpingBackfilling Same Canal – 2 categories

8. 8 Update on Monroe County Demonstration Projects (con’t)  Site visits performed in June to meet with homeowners to verify locations of equipment and identify areas required for construction  Field work underway in July/early August  Baseline conditions surveys/engineering reconnaissance  Mangrove surveys  Review of FIU benthic survey results  Bathymetric and planimetric surveys  Sediment and soil borings  Preliminary Design and Permitting - Aug/Sept/Oct The Loop Current

9. 9  Monroe County has agreed to sign as applicant and operator, as well as owner of submerged lands not identified as state or privately owned  “De Minimis” exemptions, GPs, and NW permits will be used where possible  USACE is re-issuing GP-82 and planning a meeting with the FKNMS to identify what additional GPs can be utilized in the future in the Keys  Pre-application meeting held July 1 with Monroe County Growth Management/Planning and Environmental Resources 1. Identified the need for a Temporary Use Variance for staging equipment in residential vacant lots 2. Comprehensive Plan language prohibiting maintenance dredging to below -6 feet mean low water – need for a waiver or Comp Plan change Monroe County Demonstration Project Permitting Status

10. 10 Canal #290 Avenue J Bathymetric Profile

11. 11 Canal #266 Doctors Arm Bathymetric Profile

12. 12  Expedite permitting  Bid the construction of the restorations  Target is to start several of the projects by January 2015  Construct restorations  Ranges from 2 weeks to 3 months  Monitor effectiveness (FIU)  Identify additional sources of funds to implement more restorations  Modify restoration implementation process as needed  Public outreach and education/Implement Best Management Practices in canals Next Steps for Monroe Demonstration Projects

13. 13 Revised #278 Eden Pines Conceptual Design  Canal #278 Eden Pines, Big Pine Key was selected for implementation of a pumping technology  The original conceptual design:  Intake pipe near the box culverts in Big Pine Slough, or  Discharge pipe in Big Pine Slough  Both locations required US FWS access, which was not forthcoming  Alternative designs have been evaluated

14. 14 Canal #278 Eden Pines Objectives and Design Basis Alternative Pump Evaluation Objectives: Increase Flushing Add Dissolved Oxygen Contain the pump system within the canal footprint Design Basis 4 day water system turnover >4 mg/L Dissolved Oxygen 4 feet minimum draft clearance at MLW Two pump systems were evaluated: Venturi Pump System Geyser Pump System

15. 15 Canal #278 Eden Pines Alternate Conceptual Pumping System Geyser Inertia Pumps (GIP): Pros – Lower energy consumption - smaller solar panel footprint (10’ x 5’). Cons – 1. Does not provide sufficient gas exchange, therefore a fine bubble diffuser will need to be added to the transmission line. 2. Does not pump water laterally more than 100’. 3. Requires land access for compressors. Venturi Pump System: Pros – Provides good gas exchange Cons – Higher energy consumption - larger solar panel footprint (50’ x5’).

16. 16 Canal #278 Eden Pines Alternate Conceptual Design GIP System Components: 10 pump sites (1/3 HP compressor for GIP and 1/3 HP compressor for diffuser) 10’ of 6” Perforated Suction pipe run along bottom canal. 100’ of 6” Discharge pipe affixed to canal headwall at mid-depth Solar Panels(50 sq ft for each system)

17. 17 Canal #278 Eden Pines Alternate Conceptual Design Venturi System Components: 10 pump sites (5 HP submersible pump with venturi) 12” PVC Discharge pipe run along the canal bottom 6” HDPE Perforated Suction pipe run along bottom canal. Solar Panels(250 sq ft for each system)

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