TRI/CON ENGINEERING INC.
	PHASE III -- REMEDIATION GROUNDWATER MONITORING AND SAMPLING PROGRAMS

 

TRI/CON's staff have performed remediation services, or Phase III programs, at sites ranging from gas stations to National Priority List (Superfund) sites. Our approach to an impacted site incorporates geologic, hydrologic, and biologic aspects, contaminant characteristics, and regulatory requirements to select and implement cost and time effective solutions. In this regard, we will perform either preliminary or detailed site investigations, depending on the amount of available information, using the following:

• Site visit and reconnaissance
• Site mapping/geophysical methods
• Aquifer identification/testing
• Multimedia sampling and analysis
• Regulatory review
• Toxicity testing
• Contaminated zone characterization
• Risk analysis
• RI/FS for Superfund sites

Due to the variability of conditions at sites which may or may not require some remedial mitigation, TRI/CON approaches each project with a multi-discipline team of professionals and technical staff. This approach allows for a more comprehensive analysis of the contaminant problems and the appropriate mitigation approach.

After an initial evaluation of variables, TRI/CON discusses the site specific conditions, regulatory requirements, and costs with the client prior to preparing a remedial program. This allows TRI/CON to design a flexible mitigation package which will remediate the contaminant problem(s) in a cost effective and timely manner, satisfying the needs of the client and regulatory agency requirements.

TRI/CON's use of a multi-disciplinary team to evaluate and design a contaminant mitigation program allows for the development and evaluation of multiple scenarios and how these various scenarios best fit the specific conditions. TRI/CON uses multiple site characterization methodologies such as:

Gillette Papermate Remediation by Vapor Extraction for Chlorinated Solvents

• Site screening and preliminary contaminant plume definition with soil gas surveys, soil sampling, and groundwater sampling using the Geoprobe Sampling Unit

• Drilling and sampling soil borings and groundwater monitoring wells to characterize and define contaminant plume(s)

• Contaminant Fate Modeling and Contaminant Transport Modeling where appropriate

• Permeability testing of vadose and saturated zones to determine appropriate remedial design conditions.

Upon definition of the site variables, TRI/CON will then develop a site specific remedial plan to mitigate the contaminant problems in the most efficient and cost effective manner as specified by the site and/or client-regulatory mandated conditions.

TRI/CON has use and is currently using the following remedial techniques for mitigating soil and groundwater contaminant problems.

• In-situ and ex-situ venting and vacuum extraction systems
• Bio-enhanced in-situ and ex-situ soil venting systems
• Excavation and ex-situ treatment and/or fixation of contaminated soils
• In-situ groundwater air sparging and vacuum extraction recovery
• Total fluids pump and treat systems for contaminated groundwater
• Free product recovery augmented with total fluids pump and treat
• Combined soil venting and groundwater recovery projects to expedite site cleanup

In addition to offering full remedial services, TRI/CON also has trained technicians who can provide operations and maintenance of existing systems at very competitive rates.