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Home My WebLink About15-05-13 Item 5 - PPT i.• At. �i i� h_ � �• -,'n�f �- YR_ � -.4, a_ss� -!rte-y�l T � � ''� -�.s IA Spa or Developing a Bay-wide Management Strategy for Maintenance Dredging Presented by Chris Miller, City of Newport Beach, and Adam Gale, Anchor QEA March 24, 2014 Project Goals Develop a more effective and useful maintenance dredging permit approach .,, W 47Z e Park �V `ANTn Ari, a d Victoria St Hc.c i i-- Talbert a 114D, Upper Ad Regional = Newport CALIFORNIA ParkF` Bay `, F. 9��s Regional - San Francisco a Park ' Project Location 7 � Los Angeles Newpo t l` Y Project Location E Co Not to Scale �dSt611 c' L ona del Mar c 0 a Crystal Cove St Park Crystal Cove 3 The Need for Maintenance Dredging I _' 1 1 r _ - - - _ -- ,meati �•"_� Y�"��.� - .�-.e_ Purpose of RGP • Regional General Permits ( RGPs ) "are developed to avoid unnecessary regulatory control over activities that do not justify individual control or which are adequately regulated by another agency" ( 33 CFR 320 . 1 (a ) ( 3 ) ) mammon �5 4 ---?�.! • ` t=}-:.-.+r y,..et.--; ^ � i . . � .s t.ter_ X History of RGP 54 • Permit originated in 1974 • Known as the Blanket Dredging Permit • Evolved into RGP- 18 in 1989 and RGP - 54 in 2000 • Renewed every 5 years c 4 ---?�.! • ` t=}-:.-.+r y,..et.--; ^ � i . . � .s t.ter_ X Harbor Commission Dredging Subcommittee • Key members - The public , including private residents and business owners - Consultants - Harbor Commission staff • Forming approach for new and better RGP 54 4 Existing RGP 54 2014 Proposed RGP 54 Annual Maximum Volume 20,000 cubic yards (cy) 75,000 cy Individual Project 1 ,000 cy 8,000 cy Volume Limit Maximum Maximum of -7 feet MLLW Maximum of -10 feet MLLW plus 2 feet of overdredge Dredge Depth plus 1 foot of overdredge (1 paid and 1 unpaid) (based on authorized depth of harbor) Sediment Testing Periodic 5 e years) characterization Periodic baywide characterization (5 years) on ((5 Eelgrass No impacts allowed Impacts permitted and will be mitigated pursuant to SCEMP or future applicable policy Repair or replace docks, bulkheads, and piles with similar Structures No maintenance allowed structures; reconfiguration of existing docks to meet modern standards and boater needs will be allowed (still being considered) 4 -t' Baywide Sediment Sampling • Sampling conducted in July 2013 • Sediment cores collected at 58 stations within Newport Bay via electrically powered vibracore • Sampling and analysis results discussed at DMMT .o WF Al malt ' PON'ON - s Baywide Sediment • • Results LEGEND: EXTE Suitable to-10 feet MLLW plus 2 • —feetdoverdepth for unrestricted disposal at the lA3 DDMD$. Grain size required pnor to beach DOVER replenishment to demonstrate SHORES suitability. �s �':r - -Suitahleto-10 feetMLLW plus? II "CC •, feet of overdepth for unrestricted !>' disposal at the lAd ODMOS. _IA . .# _ Material proposed for beach ' -' - placement must have grain size veriflmtion and chemical terting " , , with agenry concurrence[o verify . sultabiliry prior to placement. ® Suitable to-7 feet MLLW plus 1 �w� foot of overdepth for unrestricted O �� _ disposal at the lA3 ODMDS. Z-layer testing to confirm It postdredge surface contains (y.� mercuryless thanlppm prior to '•:v , Q �� - dredging to demonstrate newly e><posed surface Is clean.Grain size required prior to heath � replenishment to demonrtrate sultabiliry. ®Area not included under proposed RGP 54. t Eelgrass • Nursery for juvenile fish species • Support both commercial and recreational fisheries • Habitat for fish and bird foraging ground • Minimizes and slows coastal erosion Source: EcoMarine 2012 Eelgrass Regulatory Requirements • Eelgrass is considered a sensitive resource by state and federal agencies • Federal agencies are required to consult with NMFS on all actions or proposed actions authorized , funded , or undertaken by agencies that could adversely affect eelgrass • Mitigation requirements per the Southern California Eelgrass Mitigation Policy, or "SCEMP " 4 Biannual Eelgrass Surveys ., � '��y�j -� � �tt►tF+ -rte � ..•r s r � �3 - LINDA ISLE BAYSIDE VILLAGE _ MARINA COAST HIGHWAY j ,,RIDGE ? i BALBOA YACHT • {r BASIN w �0 BALBOA NLAN4' F BRIDGE J BALBOA ISLAND 15TDOCK BA(6pA pFV/MSU : PACIFIC OCEAN .. ... «-�.A Summary • Once implemented and approved , new RGP 54 will allow the following key activities - Maintenance dredging to - 10 feet MLLW ( plus 2 feet of overdepth ) - Cumulative annual dredging limit up to 80, 000 cy - Maximum 8 , 000 cy per project limit - Impacts to eelgrass permitted with appropriate mitigation 4 Questions 4504 i rr r rrr�•� —=e1 ` did - t . r.-7T''�---•-�.=A� ...::��.�. �.�- .--- ate.-,-n - _. - —__ - _ ` �---+A,-,i t re7 e �� - -•r a ""�C— �ix � o LFK Source: WRA October 2013 For More Information Chris Miller cmillerC newportbeachca . o,ov (949 ) 644- 3043