DREDGING YOUR DOCKS 2012 Organized By CRA Hydrographic
Surveyors Orion Marine Group
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DREDGING YOUR DOCKS 2012 Supported by USCOE Galveston District
U. S. Coast Guard Port of Houston Houston Pilots Lone Star Harbor
Safety Com.
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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
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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
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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.
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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
Survey Recommendations annually Calculates siltation rates &
dredge cycles Help evaluates annual dredge budgets Documents pre-
post storm elevations Provides pilots & customers with depth
data
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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
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DREDGE MATERIAL PLACEMENT AREA DMPA selection Location Permit
Cost Availability
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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)
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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.
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SEDIMENT SAMPLING Analytical Testing Metals Organics
Hydrocarbons Pesticides Sample result are usually acceptable for 6
months to one year period
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SEDIMENT SAMPLING Field work Lab analysis Final report
Submittal process Approval ***It takes approximately two week to
obtain a final report***
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 HYDRAULIC
DREDGING
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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
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MECHANICAL HYDRAULIC OFF-LOADING Hydraulic or electric powered
Deployed by a crane barge Normally used for short distance
pumps
DREDGE PROJECT MANAGEMENT Dredging Manage & test effluent
discharge Coordinate vessel traffic Debris & trash Schedule
docks Daily time tickets Interim surveys Post dredge survey
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POST DREDGE CLOSEOUT Review dredge daily logs, and time tickets
Review contractors & 3 rd party post dredge survey Evaluate the
results Mutually agree on a quantities Submit to DMPA Owner Pay
disposal fees Pay contractor
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PROJECT PLANNING Periodic hydrographic survey Review
sedimentation rates Establish dredge cycles Be aware USCOE projects
Coordinating with neighboring facilities
Slide 33
PROJECT PLANNING Cont. Keep permits up to date Have a dredging
relief plan DMPA applications & contracts Establish alternate
DMPA Consider on-site disposal options