DREDGING YOUR DOCKS 2012
Organized By
CRA Hydrographic Surveyors
Orion Marine Group
DREDGING YOUR DOCKS 2012
Supported by
USCOE Galveston District
U. S. Coast Guard
Port of Houston
Houston Pilots
Lone Star Harbor Safety Com.
DREDGING PRIVATE TERMINALS
•Permits
•Hydrographic & Pre-Dredge Survey
•Dredge Material Placement Areas
•Sediment Sampling
•Dredging Method Selection
•Cost & Scheduling
•Dredge Project Management
•Post Dredge Closeout
PERMITS
•Maintaining a current permit, includes:
•Current date, owner & information
•Execute a time extensions - 10 years, if required
•Amendment to add any potential DMPA
•Confirm dredge methods
• Submit any amendments for any new construction
•Approval process and or public notice
•Confirm USCOE final approval
PERMITS
Nation Wide #35
•The NWP #35 can be utilized for certain maintenance project.
•Dredging can be performed to previous authorized depths.
•Material must be deposited in upland site with proper siltation
controls.
PERMITS
Nation Wide #35
Texas Owners must meet the special provisions.
•Require owners to obtain a Water Quality Certification from the TCEQ
.
• TCEQ requirements 300 mg/l (TSS) or less suspended solids.
• It takes about s 1 to 2 weeks to obtain the certification.
HYDROGRAPHIC & PRE-DREDGE SURVEY
Hydrographic Surveys
HYDROGRAPHIC & PRE-DREDGE SURVEY
Hydrographic Surveys
•
•
•
•
•
Survey Recommendations –annually
Calculates siltation rates & dredge cycles
Help evaluates annual dredge budgets
Documents pre- post storm elevations
Provides pilots & customers with depth data
HYDROGRAPHIC & PRE-DREDGE SURVEY
Pre-Dredge Survey
•
•
•
•
•
Pre-Dredge Survey within two Weeks
Compare Contractors with 3rd Party
Verify, Quantities, Tide Gauge, & intervals
Verify survey datum and station #’s
Include over-dredge and side slopes
DREDGE MATERIAL PLACEMENT AREA
•DMPA selection
•Location
•Permit
•Cost
•Availability
DREDGE MATERIAL PLACEMENT AREA
•Submittal & Approval Process
•Application Fee
•Submittal of survey
•Dredge quantities
•Sediment samples
•Approval of application & sediment samples
•Contract Signing & Deposit (if required)
SEDIMENT SAMPLING
•Sediment sampling criteria.
•Sampling technique.
•Number of sediment samples required.
•Understand submittal & approval process.
•Acceptable, discretionary, & disapproved.
•Schedule enough time submittal & review process.
SEDIMENT SAMPLING
• Analytical Testing
•Metals
•Organics
•Hydrocarbons
•Pesticides
•Sample result are usually acceptable for 6 months to one
year period
SEDIMENT SAMPLING
•Field work
•Lab analysis
•Final report
•Submittal process
•Approval
***It takes approximately two week to obtain a final report***
DREDGING METHOD SELECTION
•Hydraulic
•Mechanical
•Mechanical/hydraulic offloading
•Hopper dredging
HYDRAULIC DREDGING
• Traditional diesel
powered dredge
• Dredges available in
different sizes
• Material is pipelined to
spoil area
• Can move larger
volumes of material
• Requires a larger spoil
area
MECHANICAL DREDGING
• Can be used for relief
dredging
• Several types of
mechanical systems
• Requires multiple
handling of material
• Material can be
transported by barge
• Spoil does not contain
much water
MECHANICAL
HYDRAULIC OFF-LOADING
• Hydraulic or electric
powered
• Deployed by a crane
barge
• Normally used for short
distance pumps
COST & SCHEDULING
COSTS INCREASES
•Fuel Costs
•Steel Costs
•Disposal Costs
•Bonds & Insurance
•Operating & Labor
FUEL COSTS
$3.50
$3.00
$2.50
$2.00
$1.50
$1.00
$0.50
$0.00
2001
2003
2005
2007
2012
STRUCTURAL STEEL COSTS (per ton.)
$80
$70
$60
$50
$40
$30
$20
$10
$0
2003
2005
2007
2012
DISPOSAL COSTS (per cu/yd.)
$7
$6
$5
$4
$3
$2
$1
$0
2000 2005 2007 2009 2012
DISPOSAL COSTS
• Availability of suitable DMPA’s.
• Increase in operating cost.
• Land acquisitions.
OTHER COST INCREASES
•Construction Costs
•Government regulations
•Distance to disposal areas
•Emission restrictions
SCHEDULING
Permit amendments – 1 to 6 months
DMPA application 2 to 5 weeks
Sediment sampling – 2 weeks
DMPA contracts – 1 to 4 weeks
TCEQ Water Quality Certification – 1 to 2 weeks
Pre-dredge survey – 1 week
Dredge mobilization & pipeline – 2 to 4 weeks
***Coordinate with dredge availability***
SCHEDULING
•Notification to customers
•Coordination with vessel traffic
•Actual dredge time at dock
•Channel closures
DREDGE PROJECT MANAGEMENT
•Select contractor
•Notice to mariners
•Pre-construction meeting
•Vessel & dredge scheduling
•Dredge pipeline installation
DREDGE PROJECT MANAGEMENT
•Dredging
•Manage & test effluent discharge
•Coordinate vessel traffic
•Debris & trash
•Schedule docks
•Daily time tickets
•Interim surveys
•Post dredge survey
POST DREDGE CLOSEOUT
•Review dredge daily logs, and time tickets
•Review contractors & 3rd party post dredge survey
•Evaluate the results
• Mutually agree on a quantities
•Submit to DMPA Owner
•Pay disposal fees
•Pay contractor
PROJECT PLANNING
Periodic hydrographic survey
Review sedimentation rates
Establish dredge cycles
Be aware USCOE projects
Coordinating with neighboring facilities
PROJECT PLANNING – Cont.
Keep permits up to date
Have a dredging relief plan
DMPA applications & contracts
Establish alternate DMPA
Consider on-site disposal options
THANK YOU FOR ATTENDING
DREDGING YOUR DOCKS 2012