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Site remediation is a key SHA service area, complementing and founded upon our capabilities in site hydrogeological evaluation, contamination assessment, geotechnical engineering, and understanding of regulatory framework. Our remediation expertise spans a range of services, including formulation of alternatives, feasibility evaluations, pilot testing, detailed design, cost analysis, preparation of bid documents, remedial implementation, operations and maintenance, and performance monitoring and assessment. Our capabilities in remediation technology include:
- Groundwater Extraction and Treatment for Source Control and Containment
- Vapor Intrusion Mitigation
- Free Product Recovery
- Enhanced Biochemical Degradation/ Bioremediation
- In-situ Chemical Oxidation
- Air Sparging/Soil Vapor Extraction
- Permeable Reactive Barriers
- Thermally-Enhanced Contaminant Recovery Techniques
- Waste Isolation
- Geosynthetic Materials Application
- Capping and Liner System Design
Drawing on the breadth and depth of our experience with remediation design and execution, we are frequently requested to provide second opinions or peer reviews of existing remediation projects with the objective of making recommendations for improving strategy, design, and/or operations to better achieve remedial goals. We are typically fully engaged in the implementation of our recommendations, including management of remedial system construction, startup testing and shakedown, and support of operations, maintenance, monitoring, and regulatory reporting.
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Contaminated Soil and Groundwater Cleanup
Brownfields Site - Northeastern Ohio
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 The site of a former commercial dry cleaning operation was redeveloped as a commercial retail center. Redevelopment depended upon remediation of perchloroethylene (PCE) in the underlying soils, and engineered controls to address concerns about the health and safety of store employees and customers. SHA completed an extensive subsurface investigation, as well as contaminant transport and fate analysis. SHA subsequently designed and monitored the installation of a soil vapor extraction (SVE) system to remediate the PCE, and an active subslab ventilation system to limit the potential for vapor migration into a major national franchise retail store. To date, nearly two tons of PCE solvent have been removed from the subsurface.
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Contaminated Site Redevelopment
Retail Store - Quincy, Massachusetts
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SHA provided geotechnical and geoenvironmental services for redevelopment of a site for a new 119,000 sf retail store. Key project components included: design and construction of a shallow structural mat foundation to allow for construction of the building over existing fill material and old building foundations left in-place, and to reduce the client's liability associated with excavation and disposal of contaminated soil and groundwater. The project involved the installation of utilities through heavily contaminated areas below the groundwater table, design of a subslab ventilation system with geomembrane beneath the building slab, plus negotiation and coordination with the potentially responsible party.
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Characterization and Remediation of Former Plating Facility
Somerville, Massachusetts
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A former plating facility was being considered for commercial redevelopment. Site soils contained elevated concentrations of chromium, cyanide, nickel, lead and other inorganics, as well as polynuclear aromatic hydrocarbons free product oil and volatile organic compounds. Groundwater contained elevated concentrations of chromium and nickel. Groundwater chemistry was complicated by high pH (up to 12). SHA assessed specific source areas of metals on-site, transport and fate of metals in groundwater, and explanation of elevated metals concentrations in groundwater in light of the high pH stabilization of soils. SHA oversaw the excavation and on-site stabilization of contaminated soil; the extraction and treatment of contaminated groundwater; and the construction of new site infrastructure including a major storm drain.
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Hydrogeologic Investigations and Remediation
Industrial Sites - Haute Savoie and Ille et Vilaine Regions, France
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 Hydrogeologic investigations were completed at two industrial sites where releases of chlorinated volatile organic compounds and petroleum hydrocarbons were found to have occurred. Due to the nature of these assignments and the availability of equipment to support field explorations, pragmatic approaches were used to assess subsurface conditions. At both sites, soil gas and groundwater analyses were used to characterize the extent of contamination, complete an exposure assessment of impacts to human and environmental receptors, and to develop remedial plans for contaminant mass removal and hydraulic containment. SHA has made presentations to regulatory authorities in both regions, and has completed final design of remediation systems at these sites. At one site, the remediation system has been successfully installed and is operational; at the second site, installation is waiting final regulatory approval.
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Comprehensive Remedial Investigation, Risk Assessment, Feasibility Study, Remedial Design and Implementation
Midwest Hydrocarbon and Solvent Handling Facility
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 SHA investigated the extent and fate of hydrocarbon and solvent contamination originating from a facility used for shipping, handling, and bulking hydrocarbon products, including 140,000 gallons in underground storage and 1.3 million gallons in above-ground storage. The facility has also been used historically for handling chlorinated solvent products. The remedial program consisted of capping of contaminated soils; free product and groundwater recovery using separate pumping systems; and beneficial re-use of the water at an adjacent mill. The groundwater extraction wells yield approximately 1000 gpm. SHA completed full design drawings and specifications, provided contracting support to our client, and managed construction and start-up of the remedial system. The system is operating and meeting its design objectives.
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Free-product Hydrocarbon Recovery Design
Industrial Facility - Brazil
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 SHA was requested to complete an environmental investigation and design a remediation system to address the presence of subsurface hydrocarbons at an industrial facility in Brazil. We developed a Work Plan for approval by State regulatory authority Delegacia do Meio Abiente and have subsequently worked under oversight by the State technical regulatory branch CETESB. SHA designed, in collaboration with Brazilian civil engineers, a 1,000 foot physical containment barrier wall system, with an interior stone-lined collection trench. SHA subsequently directed and tested a series of mechanical extraction technologies, and performed a cost analysis to assist with final component selection. SHA has completed design of the hydrocarbon removal system, and has assisted with its installation and operation.
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Vacuum-Enhanced Oil Recovery System
Midwest Industrial Facility
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 SHA performed the engineering design, construction management, and is currently performing operations and maintenance services for a nine extraction well, vacuum-enhanced oil recovery system for an industrial client. This remediation system has recovered more than 35,000 gallons of oil from the subsurface during four years of operation. To remove the oil trapped in low-permeability subsurface deposits, we designed a high-vacuum, liquid ring pumping system to extract total fluids from the recovery wells, and an oil/water separation treatment system to remove oil from the recovered fluid mixture. The system was designed for fully automated, unattended operation, except for weekly visits to clean the oil/water separator. As such, all equipment and instrumentation is interconnected with a microprocessor-based control system which allows for remote monitoring and control of system operations via personal computer and dial-up modem connection.
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Fast-tracked Contaminated Site Development
BJs Wholesale Club - Tilton, New Hampshire
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SHA provided complete geotechnical and geoenvironmental services during design and construction of this fast-tracked project at the site of a former 40-year old asphalt plant built in a wetland and with petroleum soil and groundwater contamination issues. Geotechnical design challenges included determining extent of compressible organic soils buried beneath historic fill soils located in proposed building areas; improvement/densification of thick existing uncontrolled fill soils and waste asphalt so that they could support buildings, roadways and parking areas; and, sequential free-product removal followed by construction phase dewatering to allow identification and removal of buried organic soils. Further complicating the project was the need to find, site and permit a water supply well within the constrained 5-acre site. The store has been completed and is open for business.
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