OLD FLY ASH WASTE PILE

 

SITE DESCRIPTION

The Old Fly Ash Waste Pile is located in the southeastern portion of the IAAAP. It was used to deposit fly ash from the Main Heating Plant and the building 1-62 Heating Plant from 1940 until 1976. It lies east of Plant Road H between Yards D and E. The eastern boundary of the site slopes steeply down to Brush Creek; the top of the site is approximately 40 feet vertical above the creek. Ash was dumped directly on the ground surface. Sludge from the Sewage Disposal Plant was placed on this landfill once or twice a year since the early 1940’s. It is unclear when this practice stopped. There is no record of the amounts of ash or sludge placed here. The majority of the surface of the Fly Ash Waste Pile is vegetated. Surface runoff flows into Brush Creek.

The PA/SI was completed in 1991, and the limited RI was completed in May 1996.

In 1999 it was discovered that the steep slope of this Old Fly Ash Waste Pile has begun to fall away into Brush Creek. It appears there may be an impact to Brush Creek. Further evaluation is necessary. Uncontrolled dumping of solid waste including tires, bricks, and 5-gallon cans, was found at this site in May 1999. 

Additional soil, fly ash, sediment and groundwater samples were collected in 2004 by MKM and documented in the Draft Final Report for the Soil Data Collection.  Elevated levels of Arsenic, Boron, and Lead were detected above background levels in groundwater as determined in the MCL. 

A Draft Final (Rev. 1) OU-4 SRI was submitted to EPA for review in July 2008 and is currently in “informal dispute”.     

A Revised Draft OU-3 RI/FS was submitted to EPA for review in April 2008.

CLEANUP STRATEGY

This site is included in the PBC awarded in 2004. 

The IRP will be responsible for groundwater and soil contamination.  The recommendation for groundwater is No Further Action as documented in the Revised Draft OU-3 RI/FS. 

 

Soil and sediment contamination advances to the FS stage and will be addressed in the OU-4 FS.  If remedial action is required, it will be addressed under LTM.