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Record of Decision System (RODS)

SAVANNA ARMY DEPOT ACTIVITY

Abstract

Site Name:  SAVANNA ARMY DEPOT ACTIVITY
Address:  7MI N OF SAVANNA ON RTE 84 
City & State:  SAVANNA  IL  61074
County:  JO DAVIESS
 
EPA ID:  IL3210020803
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-92/200
ROD Date:  03/31/1992
Operable Unit(s):  01
 
Media:  Soil, Debris, Surface Water
 
Contaminant:  VOCs, Organics
 
Abstract:  SITE HISTORY/DESCRIPTION: The Savanna Army Depot activity (SVADA) site, an active military installation, is located 70 miles west of Rockford, Illinois, in a remote and sparsely populated area. Land use in the area is predominantly agricultural and recreational, with a wetlands area located onsite. Part of the site lies within the 50-year floodplain of the Mississippi River. From 1943 to 1969, ammunition washout operations were conducted in the northwestern portion of the facility. As a result, wastewater containing explosive compounds was produced, discharged to a drain trough, and piped to four unlined lagoons, referred to as the "lower lagoons," which drained into a ditch and on to the Mississippi River. In 1961, two new unlined lagoons, or "upper lagoons," began receiving the wastewater, thus replacing the lower lagoons. Wastes that flowed into the upper lagoons drained into the soil below them. The trinitrotoluene (TNT) washout facility has not been operational since 1969, and the lagoon areas arecurrently not in use. Since 1979, the SVADA lagoon areas have been the subject of several U.S. Army investigations, which revealed significant contamination of the soil with high concentrations of the explosive TNT and other organic compounds. The soil is also a continued source of ground water contamination. This ROD addresses a final remedy for the Washout Lagoon Area Soil at SVADA as OU1. A future ROD will address the ground water in the vicinity of the lagoons. The primary contaminants of concern affecting the soil, debris, and surface water are VOCs and organics, including TNT; nitrobenzene (NB); 2,4-dinitrotoluene (DNT); 2-amino-4,6-DNT; 1,3,5-trinitrobenzene (TNB); and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), a pesticide. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil clean-up goals are based on health-based criteria and include TNT 21 mg/kg; 2,4-DNT 9.3 mg/kg; 2-A-4,6-DNT 1,191 mg/kg; 1,3,5-TNB 3.7 mg/kg; RDX 5.75 mg/kg; and NB 37.2 mg/kg. Treated soil will be subjected to TCLP and testing for other hazardous waste characteristics. Residual soil left in the ground will have no concentrations of explosive compounds that are greater than health-based criteria. INSTITUTIONAL CONTROLS: Not applicable
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes excavating an estimated 18,230 cubic yards of contaminated soil from the upper and lower lagoons, drain troughs, and piping; treating the soil onsite using a rotary kiln incineration thermal treatment process, followed by onsite disposal of the treated soil and flyash in the upper lagoon area; reprocessing any treated soil, which fails the hazardous waste characteristic tests; treating soil that does not meet TCLP standards using stabilization, prior to disposal; decanting standing water in the lagoons, with treatment, if necessary; restoring any affected wetlands; and conducting perimeter air monitoring. The estimated present worth cost for this remedial action is $10,251,000, which includes an annual O&M costof $11,400 for 2 years.
 
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