We design and implement custom strategies to remove or neutralize contaminants in soil, groundwater, and surface water—restoring site safety, value, and compliance.
Our team navigates complex regulatory frameworks to secure the environmental permits you need—streamlining approvals for construction, industrial operations, and site redevelopment.
We conduct thorough Phase I & II Environmental Site Assessments (ESAs) to identify environmental risks, ensuring informed real estate and business decisions.
Using advanced groundwater and contaminant transport models, we simulate environmental conditions to support site assessments, remediation design, and regulatory reporting.
Environmental data for contaminated site assessments—using industry-standard sampling and analysis techniques for soil, vapor, and water media.
We manage and maintain remediation systems—ensuring optimal performance, regulatory compliance, and cost-effective long-term site management.
Steve Swenson, Principal Geologist with Swenson – Marzec & Associates, Inc. developed a robust conceptual site model which demonstrated residual free product associated with a former gasoline station and situated within the shallow bedrock did not pose a threat to human health or the environment. Through the working relationship between the Illinois EPA, the Principal Geologist, the Client, and the City of Belvidere, a Tier 3 request for closure was submitted to the Illinois EPA and subsequently, a No Further Remediation Letter issued.
Steve Swenson, Principal Geologist with Swenson – Marzec & Associates, Inc. achieved closure from the Wisconsin Department of Natural Resources (WDNR) for a release of chlorinated solvents at an industrial site in Milwaukee, Wisconsin. Steve Swenson successfully demonstrated to the WDNR that: 1) remediation of the chlorinated solvents, exceeding saturation limits, were economically feasible; 2) the presence of the chlorinated solvents did not pose a threat to the employees; and 3) numerical modeling demonstrated the chlorinated solvents would naturally attenuate prior to reaching a receptor. Based on the work completed by Steve Swenson, the Site achieved closure in 2022.
At the direction of legal counsel, Steve Swenson, a Principal Geologist at Swenson – Marzec & Associates, Inc. was retained by the owner of a regional gasoline station for a release of unleaded gasoline and diesel fuel. The project was unique as the previous station owner did not obtain a variance from the Illinois Pollution Control Board to install the underground storage tanks within the setback of a municipal water well. By demonstrating the gasoline storage tanks do not pose a threat to the municipal water well, a variance was granted allowing the service station to continue to operate. Subsequently, air sparging was selected as the remedial method to promote bioremediation of the residual gasoline and diesel. Remediation of the Site lasted approximately 18 months at which time closure from the Illinois EPA was granted.