- Concentrations in the compost pile were measured for the seven constituents with cleanup levels, 14 other chlorinated pesticides, and 11 thiocarbamate and organo-phosphate compounds
- Concentrations were measured at the start of the field demonstration (T0) and at the end (T64) of a 64 week period
- The cleanup levels were achieved for 4 of 7 constituents (DDE, DDT, dieldrin, and molinate)
- DDD and toxaphene concentrations were reduced by more than 90%; chlordane concentrations were reduced by nearly 90%
The Stauffer Management Company (SMC) Superfund site is an inactive pesticide manufacturing/distribution facility in Tampa, Florida. From 1951 to 1986, the site was used to formulate organochlorine and organophosphate pesticides. From 1953 to 1973, waste materials from the facility were disposed of on site, leading to pesticide contamination in soil, surface water, sediment, and groundwater.
A ROD, signed in December 1995, specified bioremediation for treatment of pesticide-contaminated surface soils and sediments at the site. From June 1997 to September 1998, a field demonstration of SMC's XenoremTM composting process was conducted in an enclosed warehouse at the site, using soil taken from "hot spots" at the site. Amendments consisted of cow manure and straw, and the pile was alternated between anaerobic and aerobic conditions.
The ROD identified cleanup levels for seven constituents in surface soil, and concentrations of these and other constituents were measured at the start and end of the field demonstration, over a 64 week period. The cleanup levels were achieved for DDE, DDT, dieldrin, and molinate, but not for chlordane, DDD, or toxaphene. Concentrations of DDD and toxaphene were reduced by more than 90% and chlordane by nearly 90%. Although no data are available about the cost for the field demonstration, SMC indicated that typical costs for use of this technology for treating chlorinated pesticides are $132/yd3.