PowerPoint Presentation

DREDGING YOUR DOCKS 2013Supported by:USACE Galveston District

U. S. Coast Guard

Sabine Neches Navigation District

DREDGING YOUR DOCKS 2013Organized By:CRA Hydrographic Surveyors

Orion Marine Group

DREDGING YOUR DOCKS 2013 Dredging

Private Terminal

PermitsHydrographic & Pre-Dredge SurveyDredge Material Placement Areas Sediment SamplingDredging Method SelectionCost & SchedulingDredge Project ManagementPost Dredge Closeout

PERMITS

Maintaining a current USACE permit, includes:Current date, owner & informationExecute a time extensions - 10 years, if requiredAmendment to add any potential DMPAConfirm dredge methods Submit any amendments for any new constructionApproval process and or public noticeConfirm USACE final approval

USACE Consent to Easement

Obtained thru the real-estate department

Required prior to dredging in any USACE DMPA.

Documents the disposal fees due to the USACE.

PERMITSNation 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.

PERMITSTCEQ Water Quality Certification

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.

PERMITSNavigation Districts & Private DMPA

Usually requires site specific criteria:

SurveysSediment samplingPaymentsContract terms.Should be documented on the USACE

HYDROGRAPHIC & PRE-DREDGE SURVEYHydrographic Surveys

HYDROGRAPHIC & PRE-DREDGE SURVEYHydrographic Surveys

Survey Recommendations annuallyCalculates siltation rates & dredge cyclesHelp evaluates annual dredge budgetsDocuments pre- post storm elevationsProvides pilots & customers with depth data

HYDROGRAPHIC & PRE-DREDGE SURVEYPre-Dredge Survey

Pre-Dredge Survey within two WeeksCompare Contractors with 3rd PartyVerify, Quantities, Tide Gauge, & intervalsVerify survey datum and station #sInclude over-dredge and side slopes

Pre-Dredge Survey

Pre-Dredge Survey

DREDGE MATERIAL PLACEMENT AREA DMPA selectionLocationPermit CostAvailability

DREDGE MATERIAL PLACEMENT AREA

Submittal & Approval ProcessApplication FeeSubmittal of surveyDredge quantitiesSediment samplesApproval of application & sediment samplesContract 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 TestingMetalsOrganicsHydrocarbonsPesticides

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 SELECTIONHydraulicMechanicalMechanical/hydraulic offloadingHopper dredging

Traditional diesel powered dredgeDredges available in different sizesMaterial is pipelined to spoil areaCan move larger volumes of materialRequires a larger spoil area

HYDRAULIC DREDGING

MECHANICAL DREDGING

Can be used for relief dredging Several types of mechanical systemsRequires multiple handling of materialMaterial can be transported by bargeSpoil 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 INCREASESFuel CostsSteel CostsDisposal CostsBonds & InsuranceOperating & Labor

FUEL COSTS

STRUCTURAL STEEL COSTS (per ton.)

DISPOSAL COSTS (per cu/yd.)

DISPOSAL COSTS Availability of suitable DMPAs. Increase in operating cost. Land acquisitions.

OTHER COST INCREASESConstruction Costs Government regulationsDistance to disposal areasEmission restrictions

SCHEDULINGPermit amendments 1 to 6 months DMPA application 2 to 5 weeksSediment sampling 2 weeksDMPA contracts 1 to 4 weeksTCEQ Water Quality Certification 1 to 2 weeksPre-dredge survey 1 weekDredge mobilization & pipeline 2 to 4 weeks***Coordinate with dredge availability***

SCHEDULING

Notification to customersCoordination with vessel trafficActual dredge time at dockChannel closures

DREDGE PROJECT MANAGEMENT

Select contractorNotice to marinersPre-construction meetingVessel & dredge schedulingDredge pipeline installation

DREDGE PROJECT MANAGEMENT

DredgingManage & test effluent discharge Coordinate vessel traffic Debris & trashSchedule docksDaily time ticketsInterim surveysPost dredge survey

POST DREDGE CLOSEOUT

Review dredge daily logs, and time ticketsReview contractors & 3rd party post dredge surveyEvaluate the results Mutually agree on a quantitiesSubmit to DMPA OwnerPay disposal fees Pay contractor

PROJECT PLANNING

Periodic hydrographic surveyReview sedimentation ratesEstablish dredge cyclesBe aware USACE projectsCoordinating with neighboring facilities

PROJECT PLANNING Cont.

Keep permits up to date

Have a dredging relief planDMPA applications & contractsEstablish alternate DMPAConsider on-site disposal options

THANK YOU FOR ATTENDING DREDGING YOUR DOCKS 2013