|Shallow Water Hazard Surveys |
& C has more than three generations of shallow water hazard survey and geophysical surveying experience.
Our integrated service approach offers clients a wide
variety of shallow water hazard survey and geophysical mapping options to address all your survey
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.
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
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.
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.
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.
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.
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
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.
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.
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.
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.
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 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.
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.
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
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
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.
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
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.
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.
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.