The Legacy Remediation team recently wrapped up a 6-month Injection project at a DOD site located in Northern Nevada. The primary project objective was to treat chlorinated solvent and jet fuel contamination in groundwater. The selected remediation remedy was In-Situ Chemical Oxidation (ISCO) with Sodium Permanganate using groundwater recirculation.
The 40% Sodium Permanganate neat product was delivered in 275 gallon IBC Totes.
All of the project mix water was made up of extracted groundwater.
We provided and operated up to 8 groundwater extraction pumps.
Due to the harsh groundwater conditions, we used custom built stainless steel groundwater pumps fitted with viton seals.
The 40% Sodium Permangante and Groundwater were mixed together to make a 4.2% concentration mixture.
To keep a constant supply to our injection pump, we simply made alternating 300 gallon batches in our on-board mix tanks.
The Sodium Permangante mixture was distributed through a 6-point injection manifold, where we monitored the injection pressure, current flowrate, and total volume.
Digital Magnetic Flowmeters were utilized to ensure accuracy.
There were a total of 34 injection wells across the treatment area.
Due to the shallow water table we injected at a relatively low pressure and low flow rate. The injection pressure was typically less than 5 psi, and the flow rate was between 0.5-2.5 gpm.
One of the things that made this project unique was the Chaotic Mixing approach. On the average, we were injecting into 6 wells, and extracting water from 8 wells. Everyday we reference pre-determined table that laid out what Wells we would be injecting into, and what Wells we would be extracting from. So every day we would move our well head adapters to a new group of wells, and move our groundwater pumps to a new group of wells. Very early in the project, this chaotic mixing approach showed great oxidant distribution across the site.
This was a long project, and it had its share of challenges. We were onsite long enough to see all the seasons, from snow and ice, to flooding rains, to 105 degree temperatures.
I could not be happier with our field crew's dedication to safety, quality, and performance.
If you have any questions about this project, or if we can help support any of your current or upcoming projects, please contact us.
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