Case Studies

In Situ Chemical Reduction with Soil Mixing: Warrenton, VA

Project Summary

As a part of an Area Requiring Environmental Evaluation (AREE), volatile organic compounds (VOCs) were found in the clayey soils and groundwater at this former Army Base.  In situ Chemical Reduction (ISCR) technology was selected to remediate the site. Based on studies by Colorado State University, a mixture of 2% ZVI (zero valent iron), bentonite clay and a very small amount of emulsified vegetable oil was selected for mixing with the site soils to reduce the VOCs and stimulate biological degradation of the contaminates.

Geo-Solutions was contracted to provide the Soil Mixing  machine, slurry mixing and pumping equipment, and specialty operators for the ISCR work. Geo-Solutions mobilized and made equipment ready for soil mixing work in about two days.

Thirty-five soil mix treatment columns, eight foot in diameter and up to 19 ft deep were installed.  ZVI was added to the top of the columns while a slurry of bentonite and oil was injected through the hollow Kelly bar of soil mixing machine to blend and distribute the ISCR treatment into the depths of the columns. The entire soil mixing proportion of the work, including mobilization and demobilization was completed in three weeks.

Geo-Solutions also demonstrated new methods to inject the ZVI through the hollow Kelly bar, but this method was not fully utilized due to the shallow treatment depths of this project.  This application of ISCR by Geo-Solutions demonstrated the success of the technology and the economics of using newer, modern Soil Mixing equipment to perform the work. 

Location	Date
Warrenton, VA	December 2006
References
Client:	Owner:
Tetra Tech NUS	Envirocon
Pittsburgh, PA	Murrysville, PA

Treatment Area Dimensions:

1,200 cy of soil up to 19 ft deep.

Geo-Solutions Can Help

To download, read, and learn more about the various soil mixing sample specs and technical papers we offer online here at Geo-Solutions.com, click on the links below or to your left:

• Soil Mixing Sample Spec - Geo-Solutions provides a soil mixing sample spec which can be modified for real world use on your project. Download sample specification for Soil Mixing .

• Soil Mixing Technical Papers - Browse our library of Soil Mixing Technical Papers.

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