Sewage lines next to watersheds can be a real challenge and require an experienced team to make sure contamination does not occur. Our team was selected because of our unique combined experience between the construction and environmental divisions. The Upper Thompson Sanitation District needed to begin its installation of new sewer mains along the river channel. L4 was up to the task with a tight deadline and completed the project on time and on budget. No leaks, contamination, or problems.