Discussion:
The Capital Improvement Plan (CIP) was amended in 2020 to include the Quarry Lake Water Level Management Plan study which was completed and presented to the City Council on June 2, 2020. This project was subsequently pushed to 2021 and is now included in the 2021 CIP. The Quarry Lake Outlet and Erosion Project includes the design and construction of stormwater infrastructure to provide an outlet to Quarry Lake, address two erosion issues along the lake shore, and relocate a portion of the trail and dock (see attached Draft 2021 CIP summary sheet).
As presented recently and included in the water level study, Quarry Lake is landlocked because there is no outlet to allow water to discharge from the basin. Since mining operations were completed and Quarry Lake was established, water levels have been steadily rising. As a result, a normal water level has not been established. In 2019, Quarry Lake was pumped down to protect existing infrastructure from inundation and potential damage from frozen conditions. The drawdown was also to provide time to complete the water level study to evaluate outlet options and to identify a normal water level to manage the lake. In 2020, WSB completed a water level study and evaluated outlet options to Quarry Lake. A gravity outlet option was identified by this plan as the recommended outlet option.
City staff needs assistance from a design consultant to complete the design of the project. City staff have worked with WSB to develop a scope of services needed to deliver the plans and specifications. WSB has the experience, technical skill and capacity to provide the needed services and is in the city's approved consultant pool. The attached Professional Services Agreement authorizes and describes the scope and fees for their work on this project.