Legacy Remediation team recently wrapped up a Direct Push Injection in Eastern Ventura County. We were treating petroleum hydrocarbon contaminated groundwater with PetroFix provided by Regenesis.
PetroFix is a micron-scale activated carbon (1-2 microns), combined with electron acceptors. The activated carbon adsorbs the dissolved phase hydrocarbon contamination, and the electron acceptors stimulate biodegradation.
Our crew mobilized our standard Injection Trailer towed by our Injection Support Truck.
Since the treatment interval is shallow, and the available work space is tight, our client asked that try to keep a small footprint, so we decide to mobilized our Geoprobe 54LT.
We first cored the 6" concrete pavement with an electric core drill.
As is often the case, the first 5 feet was the hardest part of the job.
As we were hand clearing the first 5 feet with with a hand auger, we encountered 6-8 of these 2-4 inch cobbles all the way down.
The injection approach specified bottom-up direct push injection.
We advanced 1.5" bottom-up injection tools, targeting 2-foot long treatment intervals.
Our 54LT, that has been upgraded with a larger hammer and it was able to get to depth, however due to the cobbles, the advancement rate was slow.
We ended up brining out a 7822 to help speed things up, the 54LT was mostly used to move the tooling to the next treatment interval.
The liquid PetroFix was provided in 2,000 lb IBC Totes.
We transferred the PetroFix to our mix tanks with an air diaphragm pump, since the neat PetroFix product is somewhat viscous.
Our mix water came from a nearby fire hydrant.
The local water municipality installed a the meter, and we installed our backflow device.
We prepared the PetroFix mixture in our onboard 150 gallon Stainless Steel Mix Tanks.
As you can see the final mixture is very black in color, but the viscosity is similar to water.
The mixture was pumped an injected through our 20 point injection manifold, however due to the relatively small injection volume per point, we only had time to inject into one point at a time.
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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