Soil & Groundwater Investigation / Remediation

In addition to the required technical skills you expect, Converse has an understanding of the local regulatory environment, community concerns, innovative investigation and remediation approaches, technical limitations, and an ability to apply specific risk-based remediation goals to your project, not just regulatory standards. The integration of all of these capabilities is essential to reach a successful project conclusion.

Converse develops cost-effective solutions for investigating and remediating soil, groundwater or air by approaching your issues as if they were our own. Our objective is to determine what your remediation goals are, and then apply the least-cost remedial solutions that meet your time frame and the technical needs. Our knowledge of the advantages of remedial technologies, combined with both our strong reputation with the local regulators, and our ability to apply risk based techniques, make us uniquely qualified to succeed.

Phase II Investigations
Phase II Site Investigation can vary depending on the site conditions. A Phase II can consist of a couple surface samples to assess the levels of potential contamination to installing numerous groundwater monitoring wells and soil borings to define the extent of impacts. We utilize a variety of investigative techniques to complete Phase II work, such as surface sampling, geoprobe sampling, drill rig sampling, geophysical ground penetrating radar (GPR), and soil gas/ soil vapor sampling.

Groundwater Sampling
There are several techniques for groundwater sampling; the most common industry practice is conventional purge and sample. In addition to this method we are familiar with low flow purging and sampling (for low production wells or to reduce the amount of purge water and disposal coast) and using passive diffusion samplers which eliminate purge water and resulting disposal costs.

Remediation
Every site has unique conditions that may alter the remediation strategy. We have completed remediation for various petroleum hydrocarbons such as gasoline, diesel fuel, and oil, as well as a host of solvents such as tetrachlorethylene (aka perchlorethylene or PCE) and trichlorethylene (TCE). We offer experience and expertise of applied remedial technology in the following for hydrocarbon and various solvent releases:

• Natural attenuation
• Enhanced natural attenuation
• In-situ and ex-situ bioremediation
• Air sparging, C-Sparging
• Over purging
• Soil vapor (vacuum) extraction
• Dual phase extraction
• Reactive walls
• Hydrocarbon product recovery
• Excavation and removal
• Oxygen Enhancement (hydrogen peroxide, oxygen release compound)
• Oxygen Reduction (hydrogen release compound)
• Thermal desorption

Risk Assessment
We provide health-based risk assessments to enable us to provide a more realistic solution for achieving site closure. Each state has unique requirements for accepting health-based risk assessments, but there are national standards. Converse has risk assessors that are familiar with developing site specific target levels for your site and being able to apply those standards so the regulatory agency can utilize them.

Underground Storage Tanks and Above Ground Storage Tanks
We have provided remediation at hundreds of UST and AST sites for releases of hydrocarbons and other chemicals. We also provide tank removal oversight as is required by most local agencies dring the removal of USTs.