Site Investigation and Remediation for PCBs and Petroleum Impacts
GeoInsight was retained to conduct a wide range of environmental investigation and remediation services for an international insurance company at a property located in Simsbury, Connecticut. The 45-acre property was formerly occupied by an aircraft parts manufacturing facility. In 1984, the property was redeveloped as high-end office space utilizing the former manufacturing building. As a result of the former manufacturing operations, the property was impacted by PCBs and petroleum and was subject to both the Connecticut Transfer Act and the Federal Toxic Substances Control Act (TSCA). GeoInsight’s ability to address regulatory requirements associated with the Connecticut Department of Energy and Environmental Protection (CTDEEP) and USEPA’s TSCA Program was key to achieving project closure for this complex project.
Comprehensive field investigations – We undertook comprehensive field investigations to delineate extensive PCB and petroleum impacts to soil at the site to meet CTDEEP and EPA requirements.
Preparation of remedial plans – Following the field investigations, we prepared detailed remedial plans for the EPA under the TSCA program. Because of the extensive investigation, we were able to limit the amount of soil that needed to be removed as a TSCA waste; therefore, saving the client money.
Remedial oversight and ELUR – Following regulatory approval of our remedial plans, we oversaw the contractors during the remedial phase. Our plan included the collection and analysis of soil samples to meet TSCA requirements. To meet regulatory requirements for impacted soil beneath the building, we prepared an Environmental Land Use Restriction (ELUR), which was approved by the CTDEEP.
Regulatory Closure – We helped the client achieve regulatory closure through the EPA’s TSCA Program and the Connecticut Transfer Act Program.
Scope of Services
- Comprehensive Site Investigations & Remedial Design
- Remediation of PCB Areas
- Remediation of Petroleum Areas
- Groundwater Monitoring
- Environmental Land Use Restriction
- Regulatory Closure
Comprehensive site investigations and remedial design – GeoInsight performed a comprehensive Phase I assessment to evaluate current and former environmental conditions at the property. Based upon this information, GeoInsight conducted Phase II and III subsurface investigations to assess 28 environmental areas of concern (AOCs), primarily attributed to the former manufacturing operations. The investigation activities included preparation of detailed investigation plans, investigation of soil and groundwater quality at each AOC, and delineating identified impacts to soil and groundwater from petroleum compounds, volatile organic compounds (VOCs), metals, and polychlorinated biphenyls (PCBs). The results of the investigations were used to develop comprehensive remedial approaches for identified impacts to the subsurface at eight of the AOCs. These remediation areas included a former hazardous waste handling area with releases of PCBs, as discussed below.
Remediation of PCB areas – Following delineation of PCB and petroleum impacts at a former hazardous waste handling area, GeoInsight prepared a detailed Self Implementing Cleanup Plan (SICP) and Quality Assurance Project Plan (QAPP) for approval by the United States Environmental Protection Agency (USEPA) and Connecticut Department of Energy and Environmental Protection (CTDEEP). The objective of the SICP was to remediate the PCB and petroleum impacts in that area in accordance with Connecticut Transfer Act and Federal TSCA requirements. The remediation included the excavation and off-site disposal of 1,100 tons of PCB-impacted soil and concrete and 1,000 gallons of groundwater at licensed disposal facilities. During the remediation process, GeoInsight conducted a comprehensive post-remediation soil sampling program in accordance with the SICP and implemented a detailed air monitoring program for on-site personnel. Following the PCB remediation, GeoInsight prepared a detailed SICP Closure Report for submittal to the USEPA. The report documented the remediation activities and provided detailed Tier 1 data validation for the investigation and confirmation sample analysis. Upon approval from the USEPA, GeoInsight initiated a groundwater monitoring program to help achieve regulatory closure for that area.
Remediation of petroleum areas – In addition to the PCB-impacted area, GeoInsight remediated seven localized areas of petroleum impacted soil from former manufacturing operations at the site. The remediation included the excavation and off-site disposal of 600 tons of soil at a licensed disposal facility. Following the remediation at those areas, GeoInsight conducted a comprehensive post-remediation soil sampling program and initiated a groundwater monitoring program to help achieve regulatory closure.
Groundwater monitoring program – Following the remediation activities, we installed a monitoring well network across the site to evaluate groundwater quality, as required by Connecticut Regulations. Monitoring was conducted on a quarterly schedule. Once regulatory conditions were met for groundwater at the Site, the monitoring wells were decommissioned.
Environmental land use restriction – As part of the remedial approach for this site, GeoInsight implemented an Environmental Land Use Restriction (ELUR) for the property. After receiving approvals by the USEPA and CTDEEP, this mechanism was used to help achieve regulatory closure by allowing certain PCB impacted soils to be left beneath the building.
Regulatory closure – Following the remediation activities, GeoInsight prepared detailed Closure and Verification Reports for submittal to the EPA and the CTDEEP. Following the completion of the above remediation activities, groundwater compliance monitoring, and implementation of the ELUR, a GeoInsight Licensed Environmental Professional (LEP) filed a detailed Verification with the CTDEEP to achieve regulatory closure of the environmental issues.