Industrial Chlorinated Site

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


Downtown Orlando

Imminent Threat to Natural Attenuation

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.

Industrial DNAPL Site

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.

PRP Group

Class I Injection Well Construction and Testing

​Environmental Consulting

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.

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.

Diesel Fuel Leak

Dual Phase Extraction – Air Sparging

Tank Removal & Groundwater Clean-up


Prepared a Mechanical Integrity Test (MIT) Plan for two Class I injection wells at a waste water treatment plant (WWTP). After receipt of plan approval from FDEP, the mechanical integrity tests (MIT) were scheduled with the selected contractor and the plan executed.  MITs include collection of video surveys, pressure tests, temperature logs, and radioactive tracer surveys. The MITs were completed within the contract time and budget. The final report presenting the results of testing was approved and the wells’ operating permit was renewed.  

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 asymptotic 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.

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.

Prepared and submitted a construction and testing permit application for three Class V injection wells to be used as the primary and alternate disposal options for a small POTW. Upon successfully completing the design/permitting process, L.S. Sims & Associates, Inc. assisted in the contractor selection. LSSA provided on site construction and testing supervision during the installation of three injection wells and prepared the final report documenting construction activity and presenting test results. The wells were approved for service by FDEP and placed into service.

Mechanical Integrity Tests of Class I Injection Wells

L.S. Sims & Associates

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.

Class V Injection Well Construction and Testing

Quality. Integrity. Value. Part of your team.

Conducted a feasibility study to determine the viability of deep well disposal for citrus processing waste generated at a facility.  Submitted a Class I Test Injection Well Construction Permit Application to the FDEP.  The Construction Permit Application Package included design of the Injection Well, design of a dual zone monitor well, development of the drilling and testing program and technical specifications.  After approval of the application and issuance of the permit, L.S. Sims & Associates assisted Client in the Contractor Selection Process.  As part of the Bid Selection Process, LSSA pre-qualified potential bidders, prepared bid documents and evaluated bids for Client.  LSSA provided construction oversight and completed the well testing, geophysical logging and sampling as required by the FDEP well construction permit.  After submittal of the Final Summary Report and Operations Manual the FDEP approved the well for use during a test injection period.  The well was placed into operation and  LSSA staff are currently providing operations support for this system.  

Project Description


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.

Flexible In-Site Remediation

Copyright ©  L.S. Sims & Associates

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.

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).