Newport Bay Water Quality Programs and Projects

Transcription

1 Newport Bay Water Quality Programs and Projects City of Newport Beach/UCI Water Quality Meeting November 9, 2017 David Webb 1 Director of Public Works

2 Newport Beach Statistics

3 Newport Bay Watershed Partnership to Address Water Quality Concerns within the Newport Bay Watershed Councilmember Duffield Represents City on Executive Committee Partners County of Orange City of Newport Beach City of Irvine City of Tustin City of Santa Ana City of Lake Forest City of Costa Mesa Irvine Ranch Water District The Irvine Company CA Dept. Fish & Wildlife Santa Ana Regional WQ Control Board 3

4 Sediment Deposition into Bay Original Issue: Unchecked Sediments being Deposited into Upper & Lower Bay Sediment Control Practices Began in 1983 Sediment TMDL was Established in 1999 (set numerical limits) 4

5 Sediment TMDL Numeric Targets Compliance Indicator Sediment Load to S. D. Creek Numeric Target 62,500 tons (10-yr avg.) Compliance Summary In compliance Sediment Load Into Newport Bay Min. Depth In-Bay Unit I/III Min. Depth In-Bay Unit II 62,500 tons (10-yr avg.) -7 ft MSL In compliance beginning in 2008 (with maintenance of S.D. Creek basins) In compliance (with 1998 dredging project) -7 ft MSL In compliance: 2009 current Newport Bay * Habitat Acreages 1% change Out of compliance by 2004 survey Continued expansion of saltmarsh Saltmarsh = 350 acres, TMDL baseline = 277 acres * TMDL establishes habitat target as primary measure of success of the TMDL 5

6 Harbor Dredging Ongoing Need Main Channels, Residential Slips and Commercial Marinas Improves: Navigation Tidal Flushing Water Quality Annual Corps Harbor Depth Survey 2017

7 Harbor Dredging (cont.) US Army Corps Regional General Permit (RGP-54) Used for residential slips and commercial marinas only Allows managed impacts to eelgrass. Provides relief in the harbor Now folks can dredge near-shore! 26 applications processed to date in 2017

8 Harbor Dredging (cont.) Future Harbor-Wide Channel Dredging Developing Larger Harbor Project Objectives and Scope Conceptual Project Introduction Meeting with the Corps of Engineers on February 16, 2017 Current Thoughts for Consideration: Remove 650,000+ cy of Material above Federal Design Depth Remove Material over Longer Duration using Smaller Suction Dredge Equipment (If Permitable) Looking at Disposal into the Nearshore/Beach Zone (If Permitable) Will Need Harbor-Wide Sediment Testing & Disposal Plan

9 Harbor Dredging (cont.) Harbor Beach Sand Replenishment Recent Beneficial Reuse of Dredged Sand at Lido Isle Bridge Public Beach

10 Harbor Beach Sand Maintenance Recently Partnered with the County of Orange to Import Good Quality Beach Sand from the Santa Ana River Trucked Sand onto Balboa Island and China Cove Beaches

11 Nutrients and Algal Blooms Original Issue: Excessive Nutrients causing Algal Blooms in Creek & Bay Nutrient TMDL Adopted in 1998 Requirement - Reduce Nitrogen and Phosphorus Loads by 50% relative to Loads Reduce Summer Loads by 50% by 2007 Reduce Winter Loads by 50% by 2012 Treatment Methods Established: Nursery Irrigation runoff Recirculation and Reuse Education of Landscape Maintenance and Gardener Services Upstream Natural Treatment Systems All Targets are Currently Being Met 11

12 Fecal Coliform Indicator Bacteria (FIB) TMDL FIB TMDL Adopted in TMDL is for Fecal Coliform Only Originally Four Permanent Water Quality FIB Postings in the Bay One Remaining Posting at Arches Drain Construction of Arches Dry Weather Diversion Spring 2018 Currently County of Orange/Watershed Partners/OC Coast Keepers working with RWQCB to determine Next Steps and Path Forward 12

13 Vessel Holding Tank Pump-Outs 5 Public Sewage Pump-Out Stations Frequent Use Require On-going Maintenance Systems Replaced in Proposed Bilge Pump- Out FY CIP Dye Testing the Lines

14 Copper Based Boat Paints Most of the Harbor Generally Falls Below California Toxic Rule Limits (CTR ppb) Copper Concentrations in some areas of Newport Harbor slightly exceed CTR water quality criteria Rhine Wharf area J-Mooring field West Newport Island Lots of Variables in Play Tidal Flushing Rates, Depth of Channels Concentration and Sizes of Vessels Types and Concentrations of Cu Paints currently in use Frequency and Method of Vessel Bottom Cleaning Sampling set size, locations, dates taken, Relevant or Out-Dated Overly Conservative CTR value, Loading Rates, New Lower Copper Paint Formulas on the Horizon Other 14

15 High Flushing Tide Copper Levels Winter 2015 Residence time for Spring tides

16 Low Flushing Tide Copper Levels Summer 2015 Residence time for Neap tides

17 Trash and Debris Capture and Collection Devises Install 435 Screens on Catch Basins in the Dry Season. Approximately 40 Continuous Deflective Separation (CDS) Units Installed Citywide. (public and private) Annually Clean 3.2 Miles of Drainage Channels and 3,234 Catch Basins. Street Sweep over 36,000 Curb Miles per year. 17

18 Trash and Debris Capture and Collection Devices City Maintained Upper Bay Log Boom (Upgrade Planned) (More than 75 Tons of Debris Removed this Storm Season) City Installed and Maintains 6 Trash Skimmers City Coordinates/Participates in Various Clean-Up Events 18

19 Santa Ana-Delhi Channel Trash Collection & Low Flow Diversion Project Project Partners City of Santa Ana County of Orange City of Newport Beach City of Costa Mesa Project Goals Trash Collection Dry Weather Flow Diversion Selenium Reduction Currently Under Construction Est. Completion: Fall

20 Polaris Drive Trash Collection Project Project Goal Trash Collection Project Schedule TBD 20

21 Trash and Debris Capture and Collection Device Possible Water Wheel: 52 long x 24 wide x 14 high Possible Project Location asdfasdf

22 Balboa Island Seawall Cap Extension Project Seawall Capping Project Raise South and West sides by 9 to 9.0 Raise North Side by Estimated Construction Period Spring 2018

23 1 st NEWPORT HARBOR UNDERWATER CLEANUP Balboa Bay Club June 3, 2017

24 1 st NEWPORT HARBOR UNDERWATER EVENT TOTALS: 221 Volunteers 12 Duffy Boats Estimated 1,100 pounds of trash 14 Environmental Exhibitors CLEANUP

25 So the Good News is: Newport Beach WQ is Very Good 25

26 Newport Beach WQ is Very Good 26

27 Newport Beach WQ is Very Good 27

28 Significant Water Quality Accomplishments We are seeing the best water quality observed in the Bay since the 1960 s. 28

29 Questions & Comments Your Public Works Department A Well-Engineered Machine Protecting and Providing Quality Public Improvements and Services