Bring on your complex projects
We will gladly will take your straight forward and simple projects too, but complex projects are our specialty, and seem to be the normal.
For the next four (4) weeks one of our Southern California Gregg Remediation Teams are injecting EHC® ISCR Reagent, and a bioaugmentation culture into 45 Direct Push Injection Points at a site in Los Angeles. EHC is made by PeroxyChem and is composed of controlled-release carbon, zero valent iron (ZVI) particles and nutrients used for stimulating in situ chemical reduction (ISCR). This site in particular is contaminated with chlorinated solvents in groundwater.
In preparation of the project Gregg mobilized some of our equipment the and crew the week prior to receive the first EHC shipment. It was stored within the fenced storage area onsite.
During the same pre-project mobilization, we received a rental 6,500 gallon poly storage tank and filled it with potable water. We added Sodium Ascorbate to the water to remove the dissolved oxygen and chlorine. All mix water used for this project will be made anaerobic.
The dry EHC material is being delivered 50 pound bags, 40 bags to a pallet. Here a small amount of EHC is being weighed on a digital The scale for accuracy.
In following Gregg’s company policy, all points are being hand cleared to 5 feet bgs. As always DigAlert (Underground Service Alert of Southern California) was notified of our work and Gregg Drilling was added to the ticket as the “excavation contractor.”
Our treatment interval is between 30 to 60 feet bgs and our treatment approach is targeting 3-foot treatment intervals, top-down, at up to four simultaneous points. Our Injection Tooling is being advanced with a Geoprobe 7822 Direct Push Rig.
We are mixing and pumping the EHC in an Injection Trailer specifically designed for slurries. This Injection Trailer has dual mixers with multiple pumps to choose from. Our pumps can pump up to 75 gpm and up to 1,000 psi. We are using digital pressure gauges and Magnetic Flow Meters to track our Flow Rates and Volumes.
We are mixing and injecting the EHC at a 30% concentration, as you can see the final mixture is quite thick.
A Water Truck is being used to transport the hydrant water to the 6,500 gallon poly storage tank. The Water Truck is also being used to transport the anaerobic mix water to the work areas.
Nearby storm drains are being protected with plastic sheeting, sand bags and absorbent booms.
So we are not imposing on the local tennants, we rented a portable toilet and wash station for our crew.
On top of working at a very active facility, with long treatment intervals and heavy reagent loading, this project has many moving parts. Our experienced crew consisting of Sean Lance, Alex Jernigan, Juan Sifuentes and Amner Ramos are keeping it safe and making it happen.