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ENVIRONMENTAL CONSTRUCTION AND REMEDIATION Bear Creek Valley Geo-Con recently completed what we believe to be the first permeable reactive wall installed using the Bio-Polymer slurry trenching technique. The reactive gate consists of a 30-foot (900 cm) iron filing "gate", with two 100-foot (3,000 cm) wings composed of pea gravel. The system is 2 feet (60 cm) wide and extends down to bedrock, which is approximately 26 feet (780 cm) below ground surface. The purpose of the permeable reactive wall is to collect a plume of groundwater contaminated with VOCs. The trench intercepts the groundwater, funneling it through the pea gravel to the iron filing gate. As the groundwater passes through the filing gate, the VOCs are removed. This project was originally specified and contracted to Avisco, Inc., to be built by excavating dry and backfilling with the filings and pea gravel. Upon nearing completion of the first cut-approximately 20 feet (600 cm) deep, the trench collapsed. Geo-Con then proposed to complete the project using a Bio-Polymer slurry to maintain trench stability during gravel and iron filling installation. Geo-Con was able to complete the project in three days, expediting the project schedule and providing a considerable cost savings over other installation methods.
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