Well 4 TCP and Nitrate Mitigation Project

The Well 4 TCP and Nitrate Mitigation Project, managed by the Mettler County Water District in California, is designed to bring the water system into compliance with State Water Resources Control Board Division of Drinking Water orders by mitigating TCP and nitrate contamination. The scope includes the installation of a granular activated carbon system with two vessels in series for TCP treatment and a blending system to mix Well 4 and Well 3 water to reduce nitrate levels. Infrastructure requirements involve an 18,000 square foot project site featuring GAC vessels on concrete foundations, a backwash supply tank, an upsized booster pump, a reclaim pump, and a 20-foot pipeline corridor, all secured by a chain link fence. A recent amendment to the project involves replacing failing water meters with new spacer tubes to maintain active service lines and installing new meter boxes and meters within the County right-of-way for improved access. This modification does not require additional equipment beyond the original project specifications and does not involve new service line installations. The project has been certified under CEQA as having no significant environmental effect, with construction anticipated to be completed within a twelve-month timeframe. The contractor must adhere to all Cal/OSHA regulations regarding equipment maintenance, spill prevention, and remediation to minimize the risk of pollutant release.