Terraphase is providing Licensed Professional Engineering services at a site enrolled in the New York State Department of Environmental Conservation (NYSDEC) Brownfield Cleanup Program (BCP), governed by 6 NYCRR Part 375. The site has a history of sheet metal working and manufacturing operations.
Scope of Services
Terraphase prepared and implemented a Remedial Investigation Work Plan to delineate and characterize the nature and extent of contamination at the Site. The remedial investigation revealed petroleum hydrocarbon impacts to soil and groundwater from an on-site underground storage tank (UST), as well as chlorinated volatile organic compound (CVOC) impacts to sub-slab soil vapor.
Based on the investigation results, Terraphase evaluated remedial alternatives and developed a remedial design, which was presented in an Interim Remedial Measure Work Plan approved by NYSDEC.
Notable Accomplishments
- Designed and completed hot-spot excavation and off-site disposal of UST and impacted soil, with field screening during excavation
- Implemented an in-situ chemical oxidation program using activated sodium persulfate to address elevated total petroleum hydrocarbons, benzene, toluene, ethylbenzene, and xylene levels, with a follow-up application of liquid carbon for adsorption and bioremediation support
- Designed and installed a sub-slab depressurization system compliant with New York City Building Codes, incorporating vertical suction pits, horizontal extraction piping, and rooftop inline blowers to mitigate CVOCs in sub-slab vapor
