On April 19, 2022, City Council awarded the West End Lower Bluff Utility Improvements Project SEWER-24-001 to Northern Lines Contracting, from Bloomington, MN. Northern Lines Contracting began sanitary sewer and watermain installation in late October, and recently completed the underground utilities.

During excavation and installation of sanitary sewer pipe, lift station, manhole, and watermain pipe it was determined that the actual bedrock elevation in the pipe trench was higher than the elevation that was estimated during the initial design and included in the contract bid items. Although some soil borings were performed in the area of the project during the preliminary design, the uneven and undulating nature of bedrock can make it difficult to predict the exact quantity of bedrock excavation at the time of design.

Rock pecking and excavation of the extra bedrock has already been completed and the attached Change Order includes the necessary work (see attached revision). A summary of the work as part of this change order includes additional quantity for rock excavation needed to install the sanitary sewer pipe, lift station, manhole, and watermain pipe.