Shallow Water Hazard Surveys

C & C has more than three generations of shallow water hazard survey and geophysical surveying experience.shallow water hazard surveys

Our integrated service approach offers clients a wide variety of shallow water hazard survey and geophysical mapping options to address all your survey requirements including: 

C & Cís shallow water hazard survey capability is unmatched. We are always on call and ready to provide geophysical survey support for you 24-hours-a-day.

Nautical Charting Surveys

C & C has decades of experience performing hydrographic surveys for the National Oceanic and Atmospheric Administration (NOAA) to support the National Nautical Charting Program. We have performed hydrographic survey projects for NOAA on all three US coasts collecting data to update the nationís nautical charts.

This ongoing work is performed to strict NOAA specifications and the data is provided in client specified formats. This includes determining the position and least depths on hazards to navigation, processing data including tidal tabulation, computation of tidal datum, tidal zoning, and compiling final deliverables. Surveys are performed with state-of-the-art technology including multibeam echosounders, high-speed side scan sonars, DGPS, and vertical beam echosounders.

Side scan confidence checks and speed of sound in the water column measurements are performed regularly to calibrate and validate all hydrographic instrumentation. Tide gauges are installed, calibrated, and monitored to provide water level correctors and bottom sampling is performed when specified.

Data Processing and Deliverables

C & Cís hydrographic survey experience includes processing multibeam and vertical beam echosounder data, including tidal tabulation, computation of tidal datum, tidal zoning determination, applying water level, vessel motion, DGPS antenna offsets, and velocity of sound correctors to determine the true depths. Side scan sonar data processing involves identifying sonar targets, applying layback corrections, correlating the data with echosounder data, compiling reports, and reporting potential hazards to navigation.

Deliverables include final Field Reports, Progress Reports, Side Scan Sonar Mosaics, and a final Descriptive Report that details the results and methods used for each task in the hydrographic charting task order. The report will contain a vessel diagram with sensor offset information, tide station reporting, bottom classification information, danger to navigation reporting, and additional survey logs and information pertinent to the hydrographic project. All digital data, both processed and raw, are delivered to the client along with a Descriptive Report.

Hurricane Debris Surveys

Following hurricane events, C & C performs debris mapping surveys Oil and Gas clients, the Corps of Engineers, and NOAA. We have performed debris mapping surveys along the coasts, within the bays, and in the lakes of Louisiana, Texas, and Mississippi. This work has involved the simultaneous deployments of five survey vessels with all data processing accomplished in difficult field environments. Tasks include identification of side scan sonar features, identifying potential hazards to navigation, verification of new and previously reported dangers to navigation, as well as acquiring and processing bathymetric and tide data. The precise coordinates of objects identified as debris or dangers to navigation were delivered to the client, along with digital side scan sonar images and least depths information. 

Archaeological Surveys

C & C has the survey vessels, equipment, personnel, and experience to perform your Prehistoric and Historic Marine Archaeological Surveys. Our professional staff includes geologists, geophysicists, and fulltime BOEM/BSEE approved marine archaeologists who specialize in providing Marine Archaeological Assessments. We have the experience and expertise to also analyze your data and develop your archaeological reports for submission to the regulatory authorities.

Prehistoric Marine Archaeological Surveys

The 200-foot contour is considered the seaward limit for human occupation on the continental shelf. Most prehistoric habitation sites found on the Gulf of Mexico continental shelf are covered with marine sediments and must therefore be surveyed with specialized instrumentation including side scan sonar, subbottom profiler, and magnetometer.

C & C possesses the personnel resources, survey vessels, and instrumentation necessary to collect the appropriate data to meet your Prehistoric Marine Archaeological Survey regulatory requirements. C & Cís professional staff will review your survey data and provide you with a comprehensive assessment report regarding prehistoric archaeology for your area of operations that will comply with the most recent BOEM/BSEE guidelines.

Historic Marine Archaeological Surveys

Historic Marine Archaeological Surveys are required for any areas in the Gulf of Mexico where proposed bottom-disturbing activities may impact submerged archaeological resources. This includes but is not limited to anchoring, pipeline, flowline, umbilical, and structure emplacement, site clearance trawling, and well placement. These surveys provide data needed to develop assessments about the potential of foundered historic vessels resting within the proximity of bottom-disturbing activities. Typical instrumentation employed for these surveys includes side scan sonar, subbottom profiler, and magnetometer for water depths of less than 200 meters. In water depths greater than 200 meters, a magnetometer is not required.

C & C Technologiesí professional staff includes fulltime BOEM/BSEE approved Marine Archaeologists who review survey data for potential shipwreck sites and research our proprietary archaeological database for any ships that may have foundered in the area. Clients benefit from C & Cís extensive experience in cost-effectively expediting these assessments while complying with the most current BOEM/BSEE guidelines.

Well Site Hazard Surveys

In new leases for the Gulf of Mexico, Hazard Surveys and Shallow Water Hazard Surveys must be conducted to assess any seafloor and subsurface conditions that could have an adverse effect on proposed well site operations. These surveys focus on the conditions at the seabed and in the foundation zone where hazardous features or unstable soil may exist. Seafloor (surface) geologic hazards may include faults, gas vents, surface channels, furrows, sinkholes, hydrate mounds, unstable slopes, and reefs. Seafloor (subsurface) geologic hazards could include gas-charged sediments, faults shallow-water flow, and buried channels. C & Cís professional staff will collect, analyze, and interpret this data then deliver a detailed and accurate well site hazard report to meet your engineering and regulatory requirements.

Pipeline Engineering and Hazard Surveys

C & C provides fully integrated pipeline survey services. We have the vessels, specialized instrumentation, and professional experience to meet or exceed your shallow water pipeline survey requirements. Pre-lay Surveys are performed to identify any potential obstructions and to evaluate the structural integrity of the seafloor and subsurface, As-built Surveys verify that your pipeline was laid as your contract specified, and Inspection Surveys determine if any bottom disturbing activities may have affected the integrity of your pipeline assets.

In addition to providing you with the geophysical survey data, we also meet your data analysis and reporting requirements. Geophysical information from deepwater studies can seamlessly be integrated with shallow water data for the development of alignment sheets including detail on the bathymetry, environmental and geologic conditions, and archaeological concerns along the route. A comprehensive report including permit plats, GIS files, and geotechnical data can be provided that will comply with the most recent BOEM/BSEE requirements.

Route Clearance Surveys

C & C provides Route Clearance Surveys for pipeline Front End Engineering and Design (FEED) to help establish the optimum pipeline route. Standard sensors utilized for this survey include multibeam bathymetry, side scan sonar, and subbottom profiler. This survey data is used to develop the Scope of Work for your Pipeline Installation Contract.

Pre-lay Surveys

Performed subsequent to the Route Clearance Survey, which may have been completed as much as one year earlier, Pre-lay Surveys ensure that no new hazards or obstructions exist in the established pipeline route. These could include newly constructed pipelines, sunken vessels, and geologic incidents such a mudslides or slumping. As part of the Pre-lay Survey, C & C also offers geotechnical sampling and analysis along your pipeline route.

As-built Surveys

As-built Surveys verify that the pipeline was laid along the correct route. They also confirm that the pipeline remains in good condition with no evidence of spanning, buckling, or damage.

Decommissioning Clearance Surveys

C & C has the skill, experience, and assets required to assist your before, during, and after your decommissioning project. This includes initially researching our proprietary GIS database, CCGISmapô Professional, to determine if any pipelines, subsea infrastructure, or hazards exist within your operating areas, performing geophysical surveys to verify appropriate anchor touchdown locations, providing surface navigation for support vessels, and performing post-decommissioning clearance surveys with trawl vessels and scanning sonar.

Pipeline River Crossing Surveys

C & C provides Pipeline River Crossing Surveys to determine the bathymetry of waterways to be crossed for route development purposes and to aid in pipeline engineering design. These surveys are also performed within corridors of existing pipelines to verify their sediment cover, to identify potential problem areas, and to record a time-series record of localized sediment transfer properties.

Geotechnical Soil Sampling

C & C provides Geotechnical Soil Sampling services including piston and gravity cores up to 20 feet in length, box cores, and shallow grab samples. Soil samples provide geotechnical engineers with critical information regarding the environment they will be encountering at a project site. This information is used for the design and construction of pipelines, flowlines, umbilicals, and other subsea infrastructure and provides planning data for projects related to gravity anchors, suction piles, steel catenary risers, jack-up rig penetration, and soil thermal convection.

C & Cís Houston based Geotechnical Soil Testing Facility offers a full complement of state-of-the-art geotechnical laboratory testing services ranging from basic index tests to advanced static and dynamic tests. We also offer onboard field soil testing services including torvane, motorized miniature vane shear tests, in-situ miniature vane shear tests, automated T-Bar tests, and visual classification.

Telecommunications Cable and Pipeline Landing Site Surveys

C & C performs worldwide Landing Site Surveys for telecommunications cables and pipelines. Visual topographical features within proximity of the landing location are identified and mapped along with elevations and geographical coordinates. Where possible, a local survey monuments or benchmarks are identified and recorded for future survey control and construction purposes. Landing Site Surveys may also involve diver swim, small boat operations, and geotechnical sampling. C & Cís professional geoscientists provide interpretation with detailed final reports including Route Position Lists that minimize cable manufacturing and installation costs.

Anchor Scar Investigation Surveys

We offer side scan sonar and multibeam bathymetry surveys to determine mooring positions and identify drag scars associated with recent oil and gas activities. This information is useful in mitigating potential damage to hardground or other environmentally sensitive areas.

Sand Search Surveys

C & C employs subbottom profilers and side scan sonar to locate and determine the thickness of surface and near-seafloor sand deposits for beach renourishment projects. This data is interpreted on seismic workstations and volume calculations of the mapped sand deposits are determined. Isopatch (thickness) maps of the sand resources are developed and delivered to the client.

Burial Assessment Surveys

Pipelines, flowlines, and telecommunication cables typically require burial in shallow water environments for protection from fishing and anchoring activities. Drop cores combined with high-resolution geophysical survey data can accurately delineate where burial operations will encounter stiff resistance. C & C has worldwide experience collecting and interpreting shallow water hazard survey data in such zones on the continental shelf and upper slope.

Leg-hole Inspection Surveys

Depressions created from previously deployed jack-up rigs and lift boats can create problems for subsequent operations that require bottom touchdowns. C & C provides hazard surveys with side scan sonar and multibeam bathymetry to identify and accurately define the positions of leg-hole and mat depressions. Engineering drawings are provided to assist engineers with avoiding these significant bottom disturbances for the design and placement of future assets.



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