EDR - Film Production Studio
MARKET: Entertainment Studio – Moving to new location.
In-Situ Solid Carbon Biobarrier
Remediation Project Summary
When our client needed to expand their operations to a larger, better suited facility, Pinchin assisted with the due diligence work for the purchase of the Site. We completed a Phase I Environmental Site Assessment (ESA), and Phase II ESA. These assessments identified that chlorinated volatile organic compounds (CVOCs), in particular trichloroethylene (TCE), cis-1,2-dichloroethylene (cis-1,2-DCE), vinyl chloride (VC), and 1,1-dichloroethene (1,1-DCE) were present at the Site. Based on Pinchin’s findings, we prepared possible remediation scenarios and estimated costs for the client’s consideration. Despite the presence of CVOCs, the facility’s layout, location and features were near ideal for the studio’s operations. The client felt the cost of remediating and managing the site was within their financial and risk tolerance levels. They purchased the Site with the intent of remediating and managing the environmental impacts.
The Phase II ESA identified that the highest concentrations of CVOCs were located in fracture rock on part of the property boundary. A Remedial Technology Evaluation was completed to identify the most technically feasible and cost effective means to meet the client’s remediation and Site management objectives. A comprehensive in situ bioremediation approach was selected to treat CVOCs both on-Site and at the property boundary. Bench-scale tests were conducted to evaluate a low-cost carbon substrate. Included in the bioremediation approach was a solid carbon biobarrier placed along the boundary (to treat CVOCs prior to migrating on-Site) and an emulsified oil injection system to treat CVOCs that had migrated on-Site. The solid carbon was selected for the biobarrier because the fractured bedrock is a challenging environment for delivery, distribution and retention of soluble carbon substrates due to non-uniform openings and relatively fast moving groundwater. Continuous supply of soluble substrate within the bedrock formation would be very costly and may not create the conditions necessary to treat the CVOCs in the bedrock.
Where solid substrates have been used for this application in non-bedrock environments, many applications have resulted in biofouling due to robust microbial growth. In these situations, the pore space is clogged and groundwater flow is reduced resulting in very little treatment and increased risk as these untreated contaminants migrate offsite. At this Site, the solid substrate was mixed with sand and placed in a trench excavated into the bedrock perpendicular to groundwater flow so that groundwater containing CVOCs have the required retention time to degrade the CVOCs.
To date, Pinchin’s solution has proven cost-effective and technically successful, reducing the client’s legal and environmental risks. The in situ bioremediation system has been in operation for approximately two years with groundwater monitoring results showing considerable reductions in CVOCs within the area of influence of the biobarrier. On average, total CVOCs concentrations have been reduced by 70% beyond the biobarrier, with some CVOC concentrations being reduced by as much as 95%. Results to date, have indicated that some biofouling has occurred but this has not substantially altered the groundwater flow path. Pinchin is providing ongoing consulting support andcontinues to monitor the fate of CVOCs at the Site to determine if further concentration reductions will occur or if adjustments are need to be made to meet the Site management objectives.
Market Sector: Transactional Due Diligence, Site Remediation
Remediation Technology Evaluation,
Bench Scale Testing and Full-Scale Remediation Implementation