On August 17, 2021, City Council awarded the River Bluffs Improvement Project CIF-20-007 to Northwest Asphalt, Inc., from Shakopee, MN. Northwest Asphalt began storm sewer installation in late October, and recently completed the underground utilities.

During excavation and installation of storm sewer manholes and sewer pipe on Atwood Street, 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 storm sewer pipe and catch basin manholes.