Abstract
Landfill 5 Operable Unit
Air Sparging/Soil Vapor Extraction
Ft. Griffey, Ohio
Results:
The concentration of TCE in the soil gas extracted by the SVE system generally decreased from
210 parts per billion by volume (ppbv) to 140 ppbv during the period of April 1, 1995 through
July 27, 1995. The extracted soil gas concentration then increased to a maximum of 640 ppbv
during the period of August 1, 1995 through December 27, 1999.
Costs:
The total actual costs incurred for this project from Years 0-5 (1994-1999) are
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,852,104, with a
capital cost of 9,294. The total project costs remaining are ,111,483 (Years 6-15). The
technology-specific unit costs for soil vapor extraction and air sparging were calculated at .75
per cubic yard and .83/1,000 gallons, respectively. These unit costs include both actual and
projected costs that are applicable to each technology.
Description:
Ft. Griffey occupies approximately 86,000 acres along the northern bank of the Ohio River,
approximately 12 miles from Cincinnati, Ohio. Ft. Griffey began operating in 1917 and currently
serves as a military reservation. Ft. Griffey is divided by I-5 into North Ft. Griffey and the Main
Post.
The RI, completed in 1993 by RED, under contract with USACE, Lousiville District, included an
extensive landfill and soil gas survey and a groundwater investigation. The RI confirmed the
presence of chlorinated hydrocarbons and aromatic hydrocarbons contamination at LF5. Elevated
levels of TCE, PCE, and DCE were detected in the soil. TCE, VC and BTEX contamination was
detected in the groundwater. Elevated levels of Mn were also detected in the groundwater along
the western borders of South and Northwest LF5. However, the RI attributes these elevated levels
to the dissolution of Mn from geologic materials in the area of LF5.
The full-scale system operation began when the startup activities were completed on July 29,
1995. The full-scale system operation is currently ongoing. The concentration of TCE in the soil
gas extracted by the SVE system generally decreased from 210 parts per billion by volume (ppbv)
to 140 ppbv during the period of April 1, 1995 through July 27, 1995. The extracted soil gas
concentration then increased to a maximum of 640 ppbv during the period of August 1, 1995
through December 27, 1999. This increase generally corresponds to the opening of the passive
injection wells after July 29, 1995, suggesting that the use of the passive injection wells enhanced
the system's performance.
iv
Ft. Griffey Landfill 5 OU Interim RA Report
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