Site AssessmentRemediation Projects
PROJECT
PROJECT DESCRIPTION
PRP Group
DNAPL site with chlorinated solvent plume extending across multiple parcels of land. Transformed groundwater pump & treat system to chemical injection / oxidation treatment system for cost-effective source and plume reduction. Continuous monitoring and data review to verify effective remediation.
Downtown Orlando
Dramatic reduction of a chlorinated solvent plume spread across large parts of downtown Orlando, threatening the surface water quality in Lake Concord. This complex DNAPL project requires LSSA to partner with multiple stake-holders, delivery partners, and environmental consultants. LSSA lead on groundwater issues showcases multi-discipline capabilities from environmental sampling to complex groundwater modeling.
Industrial DNAPL Site
Prepared and implemented turn-key Interim Source Removal and Contamination Assessment Report at a large complex multi-aquifer DNAPL site (at a secure federal contractor facility). Technical issues included the potential for leakage between the Surficial and the Floridan Aquifer Systems, onsite worker health effects from vapor intrusion, and contamination of public and private drinking water supplies. Designed and implemented an in-situ groundwater remediation system to remove chlorinated hydrocarbon compounds and 1,4-dioxane from groundwater. Remedy implemented for mass removal and containment to prevent further vertical migration to the Floridan Aquifer through a karst feature present at the site.
Industrial Chlorinated Site
Remediation of a large chlorinated solvent site at a secure government contractor facility. Operated an in-situ groundwater remediation system. Demonstrated effective long-term natural attenuation through modeling and cutting edge microbial monitoring assessment with highly accurate predictions of VOC plume degradation accepted by USEPA and FDEP. After 15 years of managing a pump & treat groundwater remedy, L.S. Sims & Associates convinced EPA that natural attenuation (biologically driven reductive de-chlorination) was an appropriate remedy.
RCRA AST
Completed source removal including removal of RCRA Waste from on-site AST. Completed decontamination and removal of AST. Operated pump & treat system for 14 years. Successfully prevented FDEP from changing cleanup standards to include 1,4-Dioxane as a constituent of concern requiring remediation. Have submitted data evaluation demonstrating that asymtotic levels have been reached in recovery wells and additional pumping will be ineffective. Gained FDEP approval to deactivate pump & treat remedy. Currently preparing design document for completing In-Situ Chemical Oxidation to address remaining area of impacted groundwater.
Diesel Fuel Leak
Completed assessment to delineate soil impacted by diesel fuel leak. Completed soil removal and backfill. Prepared Closure Report. Turn-key removal of multiple drums of diesel-contaminated soil.
RCRA Facility Investigation
Completed a RCRA facility investigation, including installation of groundwater monitoring wells, sampling and confirmatory sampling of soil and groundwater, evaluation of soil leaching potential and successful negotiation with FDEP for closure for the site.
Dual Phase Extraction – Air Sparging
Prepared and implemented a RAP using bio-injections to remediate contaminated groundwater prior to site rebuild. Prepared and implemented a RAP using Dual-phase extraction and air sparging remediation to treat high concentrations of petroleum contaminants in silty soils, resulting in site cleanup in one year with recommendation of monitoring only.
Tank Removal & Groundwater Clean-up
Transformed Light Non-Aqueous Phase Liquid (LNAPL) source and 30,000 square foot groundwater plume to monitor-only. Designed and supervised removal of six above ground storage tanks, completed a large source removal, and implemented in-situ groundwater remediation system.
Flexible In-Site Remediation
Remediation of LNAPL source and extensive groundwater plume to less than 1,000 square feet using flexible design of air sparging and soil vapor extraction allowing for adaptation through remediation life-cycle.
Imminent Threat to Natural Attenuation
Transformed site status from FDEP petroleum “Imminent Threat” to monitored natural attenuation. Demolished a 3,200 square foot building, removed four (4) 10,000-gallon USTs , dewatered the site and monitored groundwater. Extensive coordination with FDEP on public health risk assessment (benzene, MTBE).