United States Navy San Diego Bay Maintenance Dredging Program: Challenges, Collaboration, and Innovative Solutions to Complex Issues Kimbrie Gobbi* and Barry Snyder – Wood Environment & Infrastructure Solutions, and Michele Desrochers, NAVFAC SW, San Diego, CA United States Navy in San Diego Bay
. San Diego Bay home to U.S. Navy since 1904 . Three primary bases . NBC Complex actually made of 2 bases on Coronado Island . Infrequent maintenance dredging . Arid climate Low sedimentation . Approximately every 5 to 20 years
2 Maintenance Dredging in San Diego Bay – The Numbers
Quantity Sampling Effort 2012 2013 2014 2015 2016 2017 20182 Naval Bases 3 1 1 1 1 1 1 Maintenance 10 2 2 3 3 6 1 Dredging Areas Composite Areas 18 5 5 3 7 14 1
Field Days 20 8 6 5 7 13 3
Core Samples 329 101 81 21 28 65 6 Collected CY of Material ~267k ~76k ~35k ~62k ~108k ~166k ~17k Evaluated1
1 – Including the two foot overdredge allowance. Volumes are conservative estimates. 2 – 2018 sampling efforts have not yet been completed. k = 1,000; CY = cubic yards; ~ = approximately
3 San Diego Bay Navy-Specific Concerns for Dredging
. Anticipating the Need to Dredge prior to Critical Need Arising . Variable Aquatic Environments . Special Permitting and Environmental Review Considerations . Contracting Considerations and Schedules . Security and Access . Space Limitations . Munitions and Explosives of Concern (MEC) . Legacy Contaminants
4 Anticipating Need
. Pre-Emptive Hydrographic Surveys
5 Anticipating Need
. Pre-Emptive Hydrographic Surveys
6 Special Permitting and Environmental Review Considerations
. Critical Applications . NOSSA . Categorical Exclusion, Finding of No Significant Impact, or Environmental Assessment under NEPA . Nationwide Permit 6 . Eelgrass Survey . 10/404/103 Permit . 401 Permit Notification
Data from surveys by Merkel & Associates
7 Contracting Considerations and Schedules
. Contracting Considerations . Aggressive Schedule Demands . Innovative Sampling and Testing Schemes . Allows for Early Decision Making
9 months – including NEPA Environmental Assessment and Permitting!
8 Security and Access
. Site Access Coordination
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9 Space Limitations
. Limited Drying Space Causes Project Delays – Requires Re-Test
~31,462 cy Approved as SUAD
10 Space Limitations
11 Mole Pier Suitability 2016
~6,913 cy Approved as SUAD
12 Munitions and Explosives of Concern
Vibracore Magnetometer
13 Munitions and Explosives of Concern
The “Grizzly”
Photos courtesy of Jon Finegold – Manson Construction
14 Legacy Contaminants
15 Awarded Projects for the San Diego Bay Navy Facilities
. Naval Base San Diego . Maintenance Dredging –Piers 4, 5, 8, and North Mole Pier –Pier 1, Paleta Creek, Pier 3, and Pier 10 Photo: Eduardo Contreras –Dry Dock at South Mole Pier . Capital Improvement at Pier 6 . Naval Base Point Loma (subbase) . Capital Improvement at Pier 5000
16 Acknowledgements
. United States Navy, Naval Facilities Southwest . United States Army Corps of Engineers . United States Environmental Protection Agency . Wood/KMEA team aka KMJV . Seaventures, Inc. - marine vessel subcontractor . Aquatic Blue – vibracore subcontractor . TEG Oceanographic Services - vibracore subcontractor . Eurofins Calscience - sediment and tissue analytical chemistry and physical characteristics . EcoAnalysts Laboratory – Toxicity Evaluations . Merkel & Associates for eelgrass surveys and data
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