Regulatory Agency: New York State Department of Environmental Conservation (NYSDEC)
Contaminants: Volatile Organics including Light Non-Aqueous Phase Liquid (LNAPL)
Remediation: Dual Phase High Vacuum Extraction (DPHVE) System and In-situ Chemical Oxidation (ISCO)
Treatment: Offsite Liquid Phase: Air Stripping & Activated Carbon (groundwater) Treatment
Vapor Phase: Electric Catalytic Oxidizer
Scope:Investigate, Remediate, Design, Build, and OperateProject Summary
- Enviro-Sciences supported and coordinated the design of both the DPHVE system and in-situ chemical oxidation program.
- The DPHVE system removed and treated approximately 1,480 pounds of contamination via soil vapor extraction and approximately 1,578,730 gallons of impacted groundwater.
- An exit strategy was negotiated with the NYSDEC.
Project Details
Based on identified contamination associated with former underground storage tanks (USTs), a Stipulation Agreement and Corrective Action Plan were executed with the NYSDEC to address the NYSDEC Spill Case.
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ESI was retained to achieve Spill Closure for the Site which included addressing approximately three-feet of LNAPL. ESI designed, installed, and operated a DPHVE system utilizing twelve (12) recovery wells.
By the time asymptotic conditions were reached, LNAPL was no longer being measured and the DPHVE system removed approximately 1,500 pounds of contamination via soil vapor extraction (SVE) and approximately 1,600,000 gallons of impacted groundwater that was treated and discharged under an approved New York City Department of Environmental Protection (NYCDEP)-permit.
Various meetings were held with the NYSDEC to discuss the asymptotic levels, current soil and groundwater concentrations remaining, and an exit strategy. The exit strategy negotiated included an ISCO treatment program and post-remedial monitoring. The program was to serve as a remediation polisher and included three (3) rounds of application with the use of twenty-eight (28) injection points.
Following post-remedial monitoring, a Spill Closure Report was submitted.
The Site is currently in the post-remedial monitoring phase. It is anticipated this Spill Case will have NYSDEC Closure in 2017.