Atlanta Brownfields Redevelopment

A geophysical survey was conducted at the site under the direction of ENERCON to determine whether an underground storage tank (UST) basin was located in the southeast portion of the site. Results of this EM-31 survey indicated a highly conductive zone in the southeast portion of the site, representing a potential buried metal object, and/or the presence of a subsurface irregularity. Subsequently, soil borings/groundwater wells were drilled in this area to assess subsurface soil and water conditions in the area of the suspect anomaly. Results of the investigation identified elevated levels of petroleum hydrocarbons in soil and groundwater in the area of the subsurface anomaly. Laboratory results indicated the contamination had migrated beneath the sidewalk/roadway. Excavation of the anomaly area and petroleum contaminated soil in this portion of the site was authorized under a previous scope of work. This task was put on hold until further assessment of the west portion of the property was completed.

Soil and groundwater investigation of the UST area identified low levels of petroleum hydrocarbons in soil and groundwater. During completion of subsequent monitoring indicated free product was identified in monitoring well MW1, south of the tank pit area. Visual observations of the free product collected from MW1 indicated that the product may have originated from an additional source. As a follow-up to this issue, two additional monitoring wells and analysis of industrial contaminants (semi-volatile organic compounds, volatile organic compounds and polychlorinated biphenyls (PCBs)) was performed to characterize the type of contaminants present. Laboratory analysis reported the presence of chlorinated solvents and petroleum related contaminants. Potential sources included; contaminants associated with the historic laundry facility (boilers, etc.) and/or chemicals associated with the former metal recycling facility activities. In addition, an inspection of the Atlanta Belt Company facility located directly adjacent to the site (to the west), identified various chemicals stored on that property near the area where the former boilers were located on the subject site. Due to the varying groundwater elevations and flow at the site, ENERCON determined if chemicals from the adjacent property had impacted the subject site, or what affects the subject site may have on the adjoining property. Groundwater information from additional assessments was helpful in evaluating physical groundwater conditions at the site.

ENERCON managed the excavation of hazardous constituents and petroleum contaminants in compliance with Georgia's Type 1 Risk Reduction Standards (RRS), which are equivalent to residential cleanup standards. ENERCON's subcontractors excavated and removed approximately 4879 tons (3750 cubic yards) of soil from four areas of the site to obtain site closure from the regulatory agency. This property has subsequently been redeveloped with residential lofts and the client received the U.S. Environmental Protection Agency Region IV Brownfields Award.

TOP