Turbidity Monitoring

Dredging for the purpose of removing contaminated sediment for remediation is a common practice for projects under CERCLA or commonly called the “Superfund” program. Monitoring at the site gives managers a look at water quality conditions during the project. Alerts are set up to ensure that water quality remains viable for the surrounding environment throughout the duration of the project.

NexSens turbidity monitoring systems generally include a buoy platform which supports turbidity sondes/sensors and other selected monitoring instruments. The systems are powered by internal batteries charged by integrated solar panels. Data from these sensors are telemetered to the cloud for a real-time look at conditions from any device.

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NexSens M550 1-3NM Solar Marine Light

NexSens M550 solar marine lights are designed for mounting to the CB-Series data buoys per USCG requirements.

NexSens CB-450 Data Buoy

The CB-450 data buoy is ideally suited for dredge turbidity monitoring, temperature profiling, dissolved oxygen monitoring, limnology research, and weather monitoring on inland lakes.

NexSens Sonde Deployment Pipe Assemblies

Sonde deployment pipe assemblies are used to house and protect valuable environmental monitoring instruments while allowing adequate water flow for sampling.

YSI EXO3 Multi-Parameter Water Quality Sonde

EXO3 is a purpose-built sonde for monitoring major water quality parameters, including: pH, conductivity, temperature, turbidity and dissolved oxygen.

NexSens 3/16" Stainless Steel Mooring Lines

Custom built 3/16" (1/4" OD) vinyl coated SS mooring lines provide plenty of holding power for securing underwater deployments.

NexSens Stainless Steel Bow Shackles

Stainless steel bow shackles securely connect mooring chain and custom-built SS mooring lines to both NexSens data buoys and pyramid anchors.

NexSens Stainless Steel Swivels

Stainless steel bow shackles securely connect mooring chain and custom-built SS mooring lines to both NexSens data buoys and pyramid anchors.

NexSens Galvanized Chain

Galvanized chain is used to construct mooring lines for buoy-based water quality applications requiring single or multi-point moorings.

NexSens Pyramid Anchors

For excellent holding power, cast iron or steel mooring anchors such as these pyramids are far superior to granite or concrete blocks.

Case Studies

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Snake River Dredge Turbidity Monitoring

The Snake River flows through parts of Washington and Idaho and is an important lane for transportation and shipping goods in the Pacific Northwest. But, over time, its value is impacted by sediment buildup that slows transportation down. The U.S. Army Corps of Engineers, charged with providing safe and reliable means of transportation throughout the United States’ many important channels and waterways, typically steps in to dredge the river when sediment levels get too high. Key to successful dredging projects is monitoring turbidity levels to make sure that fish and other aquatic life aren’t adversely affected by operations.

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Northern Caspian Sea Dredging

Kazakhstan is a country not often associated with having a shoreline, let alone a marine environment. However, in the western corner of Kazakhstan lies a section of coastline along the Caspian Sea. Through a network of rivers and channels, the Caspian Sea is actually connected to the trade routes of the world’s oceans. To support the expanding oil fields of Western Kazakhstan, a deep-water port is being constructed in the Northern Caspian Sea. The project has many challenges, including bringing ocean-going vessels into the shallow waters of the Northern Caspian. Averaging 2 meters water depth throughout much of the region, a large-scale dredging project has begun to dig a shipping channel over 60 kilometers long.

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Turbidity Dredge Monitoring

A large Midwest consulting firm was contracted to remove contaminated sediments from an embayment of Lake Michigan. The firm was required to monitor turbidity at two depths and five locations surrounding the dredge in order to ensure contaminated sediment levels did not exceed a specified range in the water. If sediment levels fell outside of the range, the dredge operator would have to be notified to slow down or alter the dredging operation. As an embayment of Lake Michigan, with significant wave action and harsh weather conditions, the dredge site offered significant challenges for deploying and maintaining the monitoring sensors.

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