Site Investigation and Remediation
Geosyntec provides site assessment and remediation services utilizing proven technologies that are often considered innovative in their application. Our assessment and remediation specialists include some of the industry’s leading practitioners. The range of services that we provide includes site investigation, planning, design, feasibility studies, regulatory negotiations, permitting, procurement, construction management and quality assurance, decommissioning and demolition (D&D) management, and post-construction monitoring.
Whether it is decommissioning and remediation of a former refinery site, remediation and closure of a CERCLA landfill, stabilization of an API separator sludge lagoon, or clean up of a former MGP site, Geosyntec possesses the in-house scientific, engineering, and construction management expertise to design, permit, and implement a cost-effective, practical solution.
For source area remediation projects, Geosyntec bring decades of experience in geoenvironmental engineering and waste containment systems to the design of encapsulation remedies to prevent exposure to contaminants. We have designed and overseen the construction of on-site disposal facilities (OSDFs), for example, for the long-term, safe disposal of soil and other media at sites contaminated with many types of industrial wastes as well as low-level and mixed radionuclides. These OSDFs have saved our clients millions of dollars compared to off-site treatment and disposal alternatives, while reducing the potential long-term liability associated with off-site disposal.
Our engineers are also specialists in the application of soil and waste treatment technologies. We have used reducing and oxidizing agents, both organic and inorganic, to change metals, such as chromium and arsenic, to less toxic and less mobile oxidation states. We have used in situ bioremediation methods to treat perchlorate-impacted soils. We have used cement, fly ash, lime, and kiln dust to solidify and strengthen petroleum sludges, pickle liquor sludges, and a wide variety of other wastes. Geosyntec has designed many types of subsurface barriers and hydraulic cutoff walls for the containment of contaminated soils and to contain or redirect groundwater flow. We have designed subsurface permeable reactive barriers (PRBs) to treat groundwater containing chlorinated solvents, metals, petroleum hydrocarbons, and other contaminants. We have applied sub-surface heating (at temperatures up to 1,500°F) to destroy contaminants in situ at significantly lower cost than excavation and off-site disposal. We have applied soil vapor extraction systems, both alone and in conjunction with other technologies, to remove volatile chemicals from the subsurface, often incorporating off-gas treatment (e.g., vapor phase carbon treatment or thermal oxidation). We implement in situ chemical oxidation programs to treat chlorinated VOCs using a variety of reagents including potassium and sodium permanganate, Fenton’s reagent, and activated persulfate.