Soil & Groundwater Articles

  • Wastewater Treatment Methods Pros and Cons: Disinfection & Coagulation

    At every stage in a wastewater treatment process is important to achieve the desired treatment results. However, primary treatment and tertiary are critical to the overall process. In the primary treatment process solids are reduced to a large extent. Without this step, subesequent treatment would be less effective. In tertiary treatment, harmful microbiological matter is rendered inactive or ...

  • Micro Pulse LiDAR: A Critical Tool for Emissions Source Detection

    Micro Pulse LiDAR remote sensing data are used to calculate a highly accurate Planetary Boundary Layer (PBL) height to improve plume models that help assess emissions sources. Poor air quality is a growing health issue that has a negative impact on the quality of life for millions of people. To help alleviate this serious problem, scientists at Bubbleology Research International (BRI) have ...

  • Mining Emissions Effectively Monitored with Micro Pulse LiDAR Technology

    Mining operations include blasting, excavating, scraping, and sifting large amounts of dirt. These activities create dust and other emissions that are transported by air currents to surrounding areas. It is easy to say that dangerous particulate matter (PM) generated by mining should be monitored and kept to a minimum; however, it is very challenging to measure the levels of contaminants in the ...

  • Researchers are Advancing Science Using Micro Pulse LiDAR Technology

    There are so many examples of interesting research using Micro Pulse LiDAR (MPL) technology it is difficult to decide on my favorites; however, I have chosen to highlight the following two papers because these applications for the MPL and MiniMPL address problems that are very important to global health. I’ve created a summary of each report and provided the citation in case you are ...

  • Protect the supply network against rising sea levels with the wastop non-return valve Case Study

    Problem: As the Baltic Sea’s quality levels have fallen, stricter requirements have been imposed on what may be discharged into the sea. The Port of Åhus is now the biggest container port in South-East Sweden and one of Southern Sweden’s most prominent bulk ports. Within the area are several different industrial facilities whose emissions are not allowed to go into ...


    By Wapro AB

  • What are Core Samplers?

    A core, in marine research, is a cylindrical section taken from sediments underlying a water body. Core samplers, the instruments used to obtain cores, range from the simple to the complex. The variety of corer types reflect the breadth and variety of marine research. For example, the simplest corers are hand-operated types used in shallow waters to collect sediment cores containing fauna. ...

  • What is a messenger?

    The work horse of water sampling is the simple messenger, the bullet-shaped weight which strikes the trip mechanism and snaps the sampler shut. Send the messenger down the line when you are ready to take your sample – you choose where and when. When you lower your bottle or dredge into the water,it remains open until you close it. Messengers afford nearly foolproof operation – highly ...

  • What are some maintenance Tips for Wildco Core Samplers?

    Cleaning Wildco® corer valves: Keep valves and seats in corer heads free of dirt, grease and oil to maintain a good air seal. It’s best to clean valve and seat after each sample with 70% ethyl alcohol. Chemical removal of rust stains from stainless steel: Stainless steel parts may show a rust stain, indicating an active corrosion cell area which should be deactivated. These are ...

  • New requirements for safe use and storage of liquid nitrogen and dry ice

    The College of American Pathologists ("CAP")recently imposed new requirementsto address risks related to the use and storage of liquid nitrogen ("LN2") and dry ice. Background The new requirements come after a deadly incident in 2017, when liquid nitrogen leaked at a Georgia lab that was not accredited through CAP.  Emergency responders were called to the scene when an employee ...

  • Habitat Restoration – Irish Cove Brook - Case Study

    Construction Date: Fall 2012 Location: Bras d'Or Lake, Cape Breton NS Category: Sand Wand™ Habitat Restoration Irish Cove Brook is located on the southeastern side of the Bras d’Or Lake, Cape Breton NS. The lower reaches of the stream are downstream of the #4 Trunk Highway, flowing ...


    By Streamside, LLC.

  • Habitat Restoration – Salmon Trout River - Case Study

    Construction Date: Summer 2012/Summer 2013 Location: Big Bay, Michigan Category: Sand Wand™ Habitat Restoration A little background Coaster brook trout were once common throughout Lake Superior basin tributaries and near shore waters, but the populations were wiped ...


    By Streamside, LLC.

  • What are Characteristics of good core samplers?

    Perpendicular placement: The core sampler must make a vertical or straight entry into sediments to secure a reliably representative cross-section sample. Penetration: It must penetrate the sediments you expect to find and adaptable for many field situations. Core retention: There should be minimal loss of any part of the sample during return to the surface. Maximum sample ...

  • Shon Sheffrey Dam Willowstick Survey - Case Study

    Atkins used Willowstick to design targeted grouting and successfully stop leakage through earth embankment dam Atkins was commissioned by Welsh Water to reduce leakage at earth dam nicknamed “the sieve”. Client admitted they would need to come up with a new name after Atkins successfully located and stopped all leakage pathways with a Willowstick assisted grouting programme. ...


    By Willowstick Technologies LLC

  • Texas Earthen Dam Seepage Flow Path Study - Case Study

    Willowstick characterizes seepage flow paths through through the dam Background An engineering company was set to build a new outlet structure for a reservoir. They had been monitoring the dam for seepage and wanted to gain a better understanding of where seepage was occurring. Of significant importance to the client was the desire to characterize any preferential seepage ...


    By Willowstick Technologies LLC

  • The Use Of Innovative Groundwater Seepage Detection Techniques - Case Study

    INTRODUCTION Groundwater seepage can exacerbate environmental pollution through contaminant transport, pose a threat to dam safety and can also be associated with valuable mineral deposits. Dam safety, environmental remedial works and mineral location normally involve comparatively expensive techniques, but, if the extent and location of groundwater seepage can be accurately ...


    By Willowstick Technologies LLC

  • Samanalawewa Dam Willowstick Survey - Case Study

    Willowstick rapidly located leak at dam troubled for decades After 18 years of unsuccessful remediation work costing tens of millions of dollars Willowstick identified the exact leakage pathway in less than a month. This enabled the client to carry out targeted remediation works at a fraction of the original cost. The leakage path identified by Willowstick was significantly ...


    By Willowstick Technologies LLC

  • Headrace Tunnel—Leak Detection - Case Study

    This hydropower plant in Central America is a vital part of its country’s infrastructure, supplying 18% of the country’s power. THE PROBLEM: HEADRACE TUNNEL LEAKAGE Our client observed their 4km headrace tunnel had major leakage problems. In an attempt to better understand the problem, the client underwent several inspections which ultimately proved unsuccessful. ...


    By Willowstick Technologies LLC

  • Wimbleball Dam Willowstick Survey - Case Study

    Atkins use Willowstick to significantly reduce cost of remediation scheme at concrete dam The cost of a proposed leakage remediation scheme at Wimbleball dam was dramatically reduced after Willowstick identified different leakage path than previously assumed. Leaking grout “curtain” suspected During construction a grout “curtain” was ...


    By Willowstick Technologies LLC

  • Earthfill Dam—Targeted Remediation - Case Study

    THE CHALLENGE An earthfill dam, in Austria, had a planned underseepage, with several piezometers installed to understand the water flowing beneath the dam. The owner wanted to know if there were preferential seepage paths or if the seepage was evenly distributed in the foundation. THE SOLUTION In 2015, Willowstick completed an investigation at the dam, ...


    By Willowstick Technologies LLC

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