Project at a Glance
- In-situ ground water injection program for a commercial and former industrial and military use site.
- Contaminants included chlorinated solvents.
- Whitman prepared a Discharge to Ground Water Permit-by-Rule which was approved by NJDEP.
- 15 chemical injection points installed.
- Injections program expected to reduce chlorinated solvent concentrations to acceptable levels or to the point of natural attenuation.
Key Words
Environmental, injections, ground water, contamination, chlorinated solvents, remediation
Overview
In 2021 and 2022, Whitman completed 2 rounds of a 2-week in-situ ground water injection program for a commercial and former industrial and military use site with operations dating back to the 1930s. The contaminants of concern included chlorinated solvents in site ground water identified between 10 and 30 feet deep.
After evaluating the ground water contamination and determining the appropriate chemical injection strategy, Whitman prepared a Discharge to Ground Water Permit-By-Rule (DGW PBR) which was approved by NJDEP. A total of 15 chemical injection points were installed around four impacted monitoring wells and at select hydraulically upgradient locations. Whitman’s field team conducted the injections event. A total of 4,500 gallons of 5% sodium permanganate was injected into the site’s ground water, with approximately 300 gallons per injection location. The targeted intervals included 5 to 20 feet at each location and 20 to 30 feet at the highest impacted location. The sodium permanganate was pumped from and injected directly from the chemical storage tractor trailer with up to 300 feet of hose. Injection flow rates were constantly monitored to assure proper operating pressures and chemical volumes. Injection rates throughout the project ranged between 1 to 3 gallons per minute. The injections event resulted in a reduction of chlorinated solvents.
The second injections event was conducted in the Spring of 2022 as a follow up to the 2021 event. Both injections events proceeded successfully and on schedule with very minimal daylighting across the site.
The injections program hopes to fully remediate the ground water impacts or at least reduce the impacts to the point of eventual natural attenuation. Whitman will be monitoring the ground water long-term. Ultimately, with these remedial efforts, site redevelopment and future site use can proceed with reduced environmental risk.
