Hazardous Materials Survey, Phase I & II ESA
Investigations Prior to Site Demolition
Tioga was selected to perform a Phase I Environmental Site Assessment (ESA), including a limited asbestos, lead and radon survey, for a multi-family housing development located in Memphis, Tennessee. The 46-acre site, constructed in 1940, was planned for demolition and redevelopment as mixed-financed/mixed-income housing.
Tioga initially performed a limited survey by sampling for asbestos and lead-based paint in 23 vacant apartments. Radon samples were collected using passive diffusion charcoal canisters over the course of 72 hours.
A second, more extensive survey to sample for hazardous materials was performed in 52 vacant apartment units in 37 separate buildings. The survey report detailed the findings regarding asbestos, lead-based paint, encapsulated surface areas and a list of materials that would require special disposal requirements.
The asbestos survey was performed in accordance with the National Emissions Standards for Hazardous Air Pollutants (NESHAP), the Asbestos Hazard Emergency Response Act (AHERA) and ASTM procedures. Homogenous areas were identified, differentiated and sampled based on color, texture and apparent installation date. Lead-based paint sampling was performed with a Niton Model XLP 300A X-Ray Fluorescence spectrum analyzer instrument. Based upon the results, Toxicity Characteristic Leaching Procedures were performed for lead to determine the disposal method during construction and any components requiring disposal as a hazardous waste.
The Phase I ESA identified recognized environmental conditions in the form of current and historical filling stations, drycleaners and funeral homes on and around the site and in the potential use of contaminated materials as backfill for the bayou that once traversed the property. Based on these conditions, 31 soil borings and 13 temporary wells were installed as part of a Phase II ESA. Soil and groundwater samples were obtained and analyzed for volatile organics, semi-volatile organics and RCRA VIII metals. Results were compiled in a report that indicated the need for ongoing investigation.
Tioga followed up with limited surficial soil assessments in the area of the former bayou that traversed the site. Elevated levels of polyaromatic hydrocarbons (PAHs) were consistently identified within the first 0 to 2 feet of soils, likely due to the fill material that was used when the housing development was initially constructed.
Remediation was proposed at the property to remove the risk of direct contact with PAH contaminated soil. Tioga prepared a Work Plan and received approval for the scope through the Tennessee Department of Environment and Conservation. The cleanup consisted of excavation of surficial soils to a maximum depth of 30 inches. Soils were disposed of at a Class 1 landfill and the excavations were backfilled with clean soil. Tioga obtained confirmatory samples and provided a Surficial Soil Remediation Report to the Tennessee Department of Environment and Conservation to close out the project.