Site Description and Use
The site is identified as Parcel Numbers: 021 001 001 and 021 001 002 (approximately 15 acres) located at 800 Lumpkin Boulevard in Columbus, Muscogee County, Georgia. The site is currently comprised of an aboveground storage tank (AST) farm with twenty-two empty ASTs, secondary containment berms and a partially dismantled above-ground piping system, a rail unloading area, a truck loading rack and paved access. Other site features include an approximate 27,280 squarefoot vacant warehouse building, an approximate 3,960 square-foot office building, and a shipping dock. The property is completely fenced and currently vacant.
According to the historical topographic and Sanborn maps, the site existed as undeveloped land from as early as 1908. By at least 1929, the site was utilized as dumping grounds by the City of Columbus. No other site utilization or development was identified until 1955, at some time prior to which, the site was developed as a portion of the northern adjacent golf course. Between 1962 and 1966, the site was developed for use as a chemical storage and distribution facility consistent with its current configuration. Surrounding development has included the northern adjacent golf course and sports fields, with waste water treatment plants having recently been constructed to the east and west of the site. A previous Phase I ESA, conducted on the subject site in 2007, did not identify any RECs associated with the site. On behalf of the Georgia Port Authority, Terracon conducted a Phase I ESA for the site dated August 11, 2015 which identified multiple RECs related to the prolonged storage and/or multiple documented spills of hazardous materials and petroleum products on the site. A Limited Site Investigation (LSI) was performed by Terracon in September 2015, which included sampling the soil at various depths at fourteen locations for volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCS) and metals. Temporary monitoring wells were also installed at each boring location to sample the groundwater for the same constituents. The laboratory results indicated a detection of lead in soil above the State-established notification concentrations in one location between 8-10 feet in depth and in groundwater at one temporary monitoring well.
Soil investigations continued in November and December 2015, and in November 2015 a permanent monitoring well was installed in the same approximate location as the temporary monitoring well that indicated a concern regarding lead concentration in groundwater. The follow up soil investigations allowed for the delineation of lead concentrations to below the Notification Concentration of 400 mg/kg within the diked area of the tank farm. Upon completion of well development and purging, sampling of the permanent well indicated lead was not detected above the laboratory reporting limit of 0.0050 mg/L.
On behalf of the Georgia Port Authority, Terracon developed and submitted a Corrective Action Plan (CAP) for remediation of the impaired soil to the EPD with the HSRA Release Notification. In May 2016, per the CAP, approximately 220.76 tons of impacted soil was excavated and disposed at an EPD permitted Subtitle D landfill. Soil confirmation sampling, performed after the excavation, documented the impacted soil was successfully removed and remaining soils are below the EPDs Notification Concentration. Terracon concluded that neither the groundwater pathway nor the onsite pathway exceeded its respective threshold value and should no longer be listed on the Hazardous Site Inventory (HSI).
The site is currently vacant and the contents of the ASTs and associated aboveground piping network have been removed. However, at the time of the 2015-2016 LSI activities, industrial quantities of ethanol and aviation grade gasoline were still stored in three ASTs at the site by Omega Partners III, LLC. Given the hazardous nature of materials stored at the site, Terracon considers the three recently used ASTs and associated aboveground piping networks a REC to the site at this time.