Soil Vapor Extraction
- 19 horizontal vapor extraction wells, 11 horizontal air inlet wells (passive), a vacuum blower, a moisture separator, and an activated carbon adsorption system
- Air flow rate - 52.9 to 122.6 cfm (average per quarter); 80 cfm (average over 2.8 years of operation)
- Operating vacuum 27 - 40 inches of water
- Constructed over the horizontal SVE wells (24-inch vegetative cover, geotextile fabric, 12-inch thick drainage layer, 60 mil thick synthetic liner, 2-ft thick clay/till layer)
In Situ Bioremediation
- Nutrient addition - 8/86-10/86; 1/97-2/97; and 8/90
- Mechanical injection of nutrient solution (nitrogen, phosphorus, potassium, and sulfur)
- ROD date: September 30, 1987
|Remedial Project Manager:|
EPA Region 5
77 West Jackson Boulevard
Chicago, IL 60604-3590
100 N. Senate Avenue, 12th Fl.
North Indianapolis, IN 46206-6015
|PRP Lead Contractor:|
Geraghty & Miller, Inc.
88 Duryea Road
Melville, NY 11747
Volatile and Semivolatile Organic Compounds (VOCs) and (SVOCs)
- More than 35 compounds identified including tricholorethane (TCA), tetracholroethane (PCA), trichloroethene (TCE), tetracholroethene (PCE), carbon tetrachloride, and benzene
Improper waste management practices
Type/Quantity of Media Treated:
Soil - 200,000 cubic yards of soil, based on an area of 12 acres and a depth of 10 ft.
Purpose/Significance of Application:
SVE system using horizontal wells, in combination with in situ bioremediation, under a multimedia cap.
Regulatory Requirements/Cleanup Goals:
- Chemical-specific soil cleanup levels were not specified for this application. Instead, requirements were specified in terms of a system design goal.
- The design goal for the SVE system was to extract a total volume of soil vapor equal to 500 pore volumes from beneath the site within 30 years. The system was to be operated to extract between 2 and 35 pore volumes per year. After 500 pore volumes of soil vapor had been extracted, the system was to be operated as a passive system.
As of 1997, 430 pore volumes and about 30,000 pounds of VOCs had been extracted by the SVE system.
- Capital cost for the SVE system - $1.2 million
- O&M data were provided only as a aggregate for all remediation activities at the site; therefore, O&M costs specific to the SVE system were not available.
From 1970 to early 1980, the Seymour Recycling Corporation (SRC) and its corporate predecessor, Seymour Manufacturing Company, processed, stored, and incinerated chemical wastes at the Seymour site. The site, which occupies about 14 acres, was closed when SRC failed to meet a 1978 agreement with the State of Indiana to cease receiving wastes and to institute better waste management practices. In 1980, the site was placed under receivership by a state court. In 1982, EPA signed a Consent Decree with a small group of Potentially Responsible Parties (PRPs) to complete "surface cleanup" at the site. On September 9, 1983, the site was listed on the NPL. A ROD signed in September 1986 specified an interim groundwater pump-and-treat system remedy. A second ROD, signed in September 1987, specified more comprehensive remediation of the site, including the use of SVE.
The SVE system included 19 horizontal vapor extraction wells, 11 horizontal air inlet wells (passive), a vacuum blower, a moisture separator, and an activated carbon adsorption system. Approximately 12,700 linear feet of horizontal vapor extraction piping (laterals) were installed about 30 inches below grade. Wells were spaced approximately 50 ft apart and a multimedia cap was constructed above the wells. During installation of the SVE system, five lateral extraction wells were damaged. Repair of these wells was not feasible because of possible cap damage; therefore, the damaged wells were converted to fresh-air inlet wells. Air inlet wells were maintained at atmospheric pressure and extraction wells maintained at less than atmospheric pressure. This configuration resulted in ambient air entering the inlet wells at atmospheric pressure, being drawn through the unsaturated zone, and then being exhausted through the sub-atmospheric-pressure extraction wells. With the exception of the five damaged wells described above, all wells were designed to be able to operate as either extraction or inlet wells. In situ bioremediation was included in the remedy because it was believed that not all of the compounds detected at the site would be amenable to SVE treatment. As of 1997, 430 pore volumes and about 30,000 pounds of VOCs had been extracted by the SVE system. Remedial activities at the site were ongoing at the time of this report.