Remediation Status: In active remediation

Why the technology was selected:
DHEC likes the technology and wanted to try someone different for the design of the system. Engineered Products and Services out of Atlanta, GA was tasked with the design and construction of the system.

Date implemented:
November 2004

Final remediation design:
Thirty injection points were installed. Not all of them are currently in use. Some are in reserve for future use. Placement of these points was based on contamintion levels but had to take into consideration the location of buildings, roads, overhead lines and underground utilities. The system has a timer to allow rotation of ozone to different points. The points are separated into eight zones, where only a few of the points are operational at at time. The ozone system itself is housed in a building that was placed along-side the drycleaner. The system includes an autodialer to alert EPS or ET in case of upset conditions (power failure, compressor shutdown, high ozone levels). A trench was dug to place the 4" and 3" PVC and HDPE casings and the depth protects the casing from traffic loads. Horizontal drilling was used in areas where feasible to cut down on the asphalt cutting and patching. The sleeve pipes will carry 3/8" EPDM tubing to each sparge point.

Results to date:
Contamination lowered by two orders of magnitude in almost all areas.

Next Steps:
Next step is to continue with the injection of the ozone. The injection schedule may have to be reset. There is some petroleum contamination that is interferring with the reduction of PCE contamination in one area.

Cost to Design and Implement:
$401,805