This document provides an overview and update on Guaranteed Maximum Price Amendment #13 (GMP #13) for the City Council workshop. It discusses the scope of GMP #13, which includes improvements to the Clean Water Facility and Phase 1 of Windjammer Park. It outlines community engagement on the park design and priorities. Cost estimates for GMP #13 are provided, broken down by funding sources. Potential impacts to sewer rates from the increased project costs are examined.