Norwest: Industrial and Manufacturing


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Industrial and Manufacturing Overview Oil and Gas Mining Power Generation Industrial and Manufacturing Government and Regulatory Agencies	Home > Experience > Industries Served > Industrial and Manufacturing Environmental Site Assessments ● Environmental Remediation Plans ● Surface Water Assessment ● Groundwater Contamination ● Environmental Litigation Support ● Environmental Due Diligence Norwest has extensive experience assisting industrial and manufacturing clients in managing surface water, groundwater and environmental remediation issues. Norwest’s clients include chemical and petrochemical facilities, refineries, commercial land developers and manufacturing facilities. In addition, Norwest provides expert technical support for law firms and insurance companies working on environmental cases and land transfer due diligence. Our senior professionals are well qualified to provide expert witness testimony on a wide variety of environmental and water resources issues. Norwest has provided Phase 1 and Phase 2 Environmental Site Assessment (ESA) services on behalf of both sellers and potential purchasers of industrial property since the mid-1980s. Our clients have included Lyondell Chemical Company, El Paso Energy Company, Textron, the Hartford Insurance Group, and Atlantic Richfield Company among others. Due to our long history with larger industrial clients, many of our engagements have spanned the full range of environmental consulting services, from Phase 1 and Phase 2 ESAs to remediation design and implementation. This broad experience base allows Norwest professionals to bring a broad perspective to our clients as compared with consultants who focus solely on Phase 1 and Phase 2 ESA documentation.	Case Study: Industrial Case Study: LNAPL Remediation Situation: An old chemical plant had accumulated at least 3 feet of thick benzene and styrene floating on groundwater in thick gravels, which periodically produced slicks on the Ohio River. Norwest performed site assessment, risk assessment. and pilot testing. Solution: Initial mass reduction was accomplished by vapor extraction with a thermal oxidizer until vapor yield declined. Norwest then engineered a sparge fence along the riverbank and created sparging clusters in hot spots. Periodic air injection via a large underwater mobile compressor broke up floating hydrocarbon that essentially lifted vapors into the vadose zone and promoted aerobic biodegradation above and below the water table. This “biosparging” mode required no recovered vapor or water treatment, and no fugitive vapors were detected. Monitored oxygen and carbon dioxide in the vadose zone correlated with hydrocarbon destruction. The floating product was completely removed after one year of operation and groundwater quality was improved to the point of meeting risk assessment criteria. Result: Norwest remediated a site that had been a candidate for NPL listing in one year’s active operation, with no groundwater treatment and vapor treatment limited to an initial vapor extraction phase.
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