Remediation System Installations
WCEC has designed, installed and/or operated over 50 remediation systems in Minnesota, over 20 remediation systems in Montana, and over 20 remediation systems in other states utilizing a wide range of technologies for sites impacted by agriculture chemicals, solvents, and petroleum hydrocarbons. Specifically, WCEC has implemented the following remedial technologies to target dissolved-phase, sorbed-phase or free-phase contamination: air sparging, soil vapor extraction, in-situ chemical oxidation, groundwater pump and treat, multiphase extraction, free-phase recovery with automated skimmer systems, on-site soil treatment and off-site soil treatment. Prior to installing a remediation system, WCEC creates an extensive conceptual design, defining anticipated steps needed to reach site cleanup and anticipating life cycle design/costs. During system installation, WCEC’s knowledgeable and experienced staff works closely with subcontractors to integrate the various system elements according to design specifications.
Following successful pilot testing at a site in southern Minnesota, WCEC recently designed and installed an air sparging curtain system to intercept dissolved-phase petroleum contamination from entering a Class 2B waterway. Upon startup of the system, benzene concentrations were reduced from over 900 ug/L to <5 ug/L in the down-gradient monitoring well. The system operation uptime has been over 95%.
Pilot Testing Services
WCEC has designed, overseen, and implemented pilot testing of various remediation technologies. WCEC completes multiphase extraction and soil vapor extraction pilot tests using their state-of-the-art mobile, automated contaminant recovery and treatment trailer. The trailer is equipped with a programmable logic controller, is capable of remote telemetry, and operates on 3-phase 208/240-volt electricity supplied on-site or by a generator. The trailer is capable of recovering and treating up to 20 gallons per minute liquids / 200 cfm soil vapors. Recovered liquids are treated through oil/water separation, air stripper and granular activated carbon. Recovered vapors can be treated with activated carbon or with a thermal oxidizer.
In 2007, WCEC implemented a multiphase extraction pilot test at a former gasoline station site in northern Minnesota. WCEC’s pilot test design identified and accounted for several critical and challenging conditions associated with the contamination within the subsurface. Due to strategic pilot test design, approximately 1000 kg of hydrocarbons were recovered while demonstrating a 65-ft radius of influence during the four-day pilot test. Following successful pilot testing, a full-scale multiphase extraction system was designed to address remaining site contamination.
WCEC utilizes a 30g/hr ozone sparge injection trailer to conduct pilot scale feasibility studies. WCEC provides delivery, setup, and monitoring during all phases of the pilot study. Following the injection series, data interpretation and system design are performed at the request of our clients.
WCEC is an Equal Opportunity Employer
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