Norwest: Environmental Assessment & Remediation


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Environmental Assessment & Remediation Our Services Geology Engineering Field Services Water Resources Surface and Groundwater Hydrology Water Control and Management Water Permitting and Compliance Environmental Assessment & Remediation Environmental Management Consulting	Home > Our Services > Water Resources > Environmental Assessment & Remediation Environmental Assessment & Remediation Surface water and groundwater investigations are critical components required for environmental assessments of resource development projects. Our services include baseline characterization and impact evaluation, soil and groundwater remediation, baseline monitoring, and groundwater fate and transport modeling. With combined strengths in hydrology and engineering, we look for cost effective measures to reduce or eliminate unfavorable impacts. Norwest has provided Phase 1 and Phase 2 environmental site assessment services on behalf of both sellers and potential purchasers of industrial property since the mid-1980s. Our involvement with such clients includes carrying Phase 1 and Phase 2 assessments forward into remediation design and implementation. This broad background allows us to offer a deeper perspective on environmental assessments than many consultants focused solely on documentation alone. Our services include: Environmental Impact Assessments (EA, EIS) Risk Assessments - Phase I , II, CERCLA, RBCA evaluations Regulatory Compliance and Due Diligence Audits Soil and Groundwater Remediation Soil Vapor Extraction Sparging Chemical Oxidation Soil heating In-Situ Bioremediation Groundwater Pump & Treat Containment and Barriers Evaporation basins Landfarming Groundwater Fate & Transport Modeling Monitored Natural Attenuation Support RCRA/CERCLA Regulatory Support MTBE degradation demonstrations Expert Testimony Alternate Concentrations Limit Petitions Health and Safety Programs and Compliance	Case Study Benzene Pool in Groundwater Situation: An active chemical plant had periodic excursions of oil slicks into the adjacent river. Norwest performed an environmental assessment under RCRA guidelines and identified a several acre pool of mostly benzene floating at the water table beneath the plant, as well as satellite “hot spots”, due to spills of coking oils in the 1940s. Solution: Norwest wrote a remedial action plan, designed, constructed and operated a biosparge fence which eliminated the floating organics in less than one year, without treatment of vapors or water, with extensive respirometry tests to demonstrate biodegradation. During the term of this remedial effort, the state enacted RBCA regulation, and Norwest was able, with its site experience gained in the active remediation and peripheral natural attenuation, and studies of the rate of release of organics from clay areas, to show that central and satellite plumes were diminishing and posed no risk to health or the environment. After a period of confirmatory monitoring the site was closed.
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