Helena Chemical Company
| Helena Chemical Company EPA ID: FLD053502696 Location: Tampa, Hillsborough County, FL Congressional District: 11 NPL Status: Proposed: 02/07/92; Final 10/14/92 Project Manager Site Repository: University of South Florida 4202 E. Fowler Ave. Tampa, FL 33620 Documents:
Site Description Site Responsibility: This site is being addressed through responsible party’s actions. Threats and Contaminants Cleanup Approach Response Action Status Removal of the pesticide contaminated soils was completed in September 2000. Approximately 7,700 tons of contaminated soil were excavated and shipped off-site for biological treatment and disposal at the WMI facility Carlyss, Louisiana. The remedial design (RD) for treatment of contaminated groundwater has been delayed due to the discovery of an adjacent facility, Alaric Area Groundwater Plume Site, where volatile organic compounds discharged onto the ground have migrated into the groundwater and appear to be commingling with the western portion of the groundwater plume from the Helena Chemical Site. Sampling of the Site’s groundwater was initiated in late December 2006 and continued through 2007. This sampling was designed to determine whether the data exist to support an amendment to the ROD. The amendment proposed by the responsible party would modify the selected remedy for the Site’s groundwater from groundwater containment to monitored natural attenuation. This proposal was not received well by EPA and the Florida Department of Environmental Protection. As a result, in September 2008 the responsible party proposed a series of pilot-scale treatability studies designed to evaluate the degration of both the remaining low-level pesticide plume, as well as the xylene source area. The draft Work Plan for these studies was received during the week of March 23rd 2009 and was reviewed and commented on by both EPA and FDEP. Field work for the pilot-scale studies are scheduled to start in August 2009. Results of the 2007 sampling indicate generally low-level pesticide concentrations, however, above the ROD’s clean-up goals. A source area of xylene remains on the Helena Chemical property, with a shallow xylene plume migrating in a southeasterly direction. Between late April and mid-June 2004, approximately 1,824 tons of sulfur-contaminated soil were removed and shipped to Carlyss, LA for treatment and disposal. After removal of the sulfur, lime was mixed into the remaining soil, in order to neutralize the sulfuric acid created through the interaction of the sulfur and groundwater present at four feet below land surface. An additional 1,146 tons of bulk sulfur were removed during the spring of 2005. Lime was also mixed into the unexcavated soil, as described above. As of mid-2007, the addition of lime appears to have had minimal effects on area with very low pH. The site’s first Five Year Review Report was concluded in January 2006. The link to the Report is: http://www.epa.gov/superfund/sites/fiveyear/f0604002.pdf. Site Repository
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