Geo-Con, Inc.

Deep groundwater collection tenches by the bio-polymer drain method

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Courtesy of Geo-Con, Inc.

Introduction
The installation of deep drainage trenches has long been a risk-filled and costly endeavor, conventional installation techniques involve dewatering, sheeting and shoring, and danger to personnel working in the trench from trench collapse. Recently, due to the public's concern for the environment and the need to preserve groundwater resources, there has been an increased demand for deeper and more sophisticated groundwater extraction an interception trenches. these trenches are even more difficult to construct because of the volatilization of toxins, and increased groundwater and trench spoil disposal restrictions and costs.

The introduction of a new construction method, the Bio-Polymer Slurry Drainage Trench (B-P Drain), now provides a quicker, safer, more cost-effective method to install deep drainage trenches. This new method is a modification of the well-known slurry trench method which uses biodegradable trenching slurry to temporarily support the trench walls and control trench width. Using the B-P Drain method the usual drainage structures, e.g. wells, perforated pipes, and free-draining aggregates can be placed without dewatering, sheeting or shoring, or men working in the trench. Experienced personnel and quality control are especially critical in constructing B-P Drains. This paper provides an overview of the technique and illustrations of a few example projects.

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