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QC-ing the QC Equipment

Posted by Dillon Hogan on April 03, 2018

All Systems Go

At Brennan, we utilize hydrographic survey systems to measure progress on all of our dredging projects. These systems typically include a positioning system, such as RTK-GPS, and a multi-beam echo-sounder. The Real Time Kinematic, Global Positioning System, or RTK-GPS, is a precise satellite navigation tool, whereas an echo-sounder is a sonar device for measuring depth. Combining the two allows us to achieve very accurate measurements on the location of the river bottom. We take the data points created during these measurements and create a 3-dimensional model using Hypack® software. By running a survey before we dredge, and then one afterward, we can create two models and compare them to one another. The difference between the two models is the total volume of in-situ yardage that we have removed. Typically, we are paid by the in-situ volume of sediment (in cubic yards) that we remove so it is very important that these measurements are extremely accurate. Therefore, establishing quality control checks on the equipment before we survey is an extremely important step in achieving accurate measurements.

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3 Crucial Steps for Dredging Near Utilities

Posted by Dillon Hogan on January 23, 2018

Dredging around utilities is challenging, and mistakes can be expensive and dangerous. When utilities, such as power lines, natural gas lines or fiber optics, are above ground they can be easily marked, and a plan can be developed to avoid them. However, when these same utilities are underwater, locating them and working around them adds an additional layer of risk for the contractor.

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Advantages vs. Disadvantages of Turbidity Curtains for Environmental Dredging

Posted by Dillon Hogan on January 08, 2018

Turbidity is a hot-button issue in the environmental dredging industry because if it is not controlled, contamination can spread to clean areas. Since every dredge project will experience the presence of suspended sediments in the water column, proper measures are taken to control this problem.

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No Roads, No Problem - The Advantages of Using Amphibious Equipment

Posted by Samantha Schmitz on September 18, 2015

One of the challenges faced during a remediation, restoration, or construction project located
in the middle of a marshland is access.  Typically contractors have to construct temporary roads to safely reach work areas.  This requirement is costly, especially in the case of an environmental remediation project where all materials have to be removed and disposed of as hazardous waste.  Building temporary roads also negatively impacts the sensitive wetland environment and its inhabitants.   There are other options that can save time and money, while greatly reducing the negative impact on both aquatic plant and animal species. 

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What Everybody Ought to Know About Environmental Dredging

Posted by Samantha Schmitz on May 18, 2012

Recently Susan Pastor with the U.S. Environmental Protection Agency wrote an article in the Spring 2012 edition of the Fox River Current titled “Latest Technology Guides Hydraulic Dredge”.  The article was about the use of a Real Time Kinematic Global Positioning System (RTK-GPS) to aid the dredge operator in removing contaminated sediments from the Fox River in Green Bay, WI.  In the article she writes about the use of the system and how it improves the accuracy in which a dredge operator can remove targeted sediments to designated depths.  These operators can view their progress in real time using pricey, high accuracy equipment.

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