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The Problem
This project involved a complex underground vault construction at Westshore Terminals in Delta, BC. The primary challenge was the generation of high levels of Chromium contamination caused by Tremie concrete pours. With a massive pumping requirement of 475 GPM, the stakes were exceptionally high: all treated water required daily lab testing before being cleared for discharge directly into the Pacific Ocean. Any failure in the treatment process would have immediately halted the concrete pour, resulting in catastrophic project delays and environmental violations.
The Solutions
The setup featured three 20,000 gallon Weir tanks for high capacity sediment control, followed by sand filters and five Ion Exchange vessels packed with specific resins to target and remove Chromium. Automated pH control boxes were utilized to stabilize the water chemistry, ensuring every gallon met the stringent marine discharge requirements mandated for the sensitive Pacific environment.
The Result
The dewatering and treatment system successfully maintained a dry, stable site for the 5 month duration with zero dewatering related stoppages. Despite the high flow rate and chemical complexity, we achieved 100% environmental compliance with zero incidents. The Tremie pour stayed on schedule, supported by our same day response standard and rigorous daily testing, proving that even high risk chemical discharge into the ocean can be managed safely and efficiently.
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