The 800-acre, multi-use Promontory project has been under construction since 2000. Complex in design and large in area, the project includes commercial parcels, office parcels, parks, a fire station site, a school site, several ponds, and both single-family residential and multi-family residential parcels. Infrastructure improvements needed to serve this large development were extensive and enigmatic but were addressed and solved by the Calibre team. In addition to typical land development infrastructure, such as local streets, water distribution lines, sanitary sewer laterals, and storm sewer, the site is served by a raw water delivery system, several collector roadways, a principal arterial roadway, several major arterials, multiple roundabouts, two connections to State Highways, a large sanitary sewer outfall, and a lengthy offsite storm drain connection. The initial phase of our design provided up-front master planning of the drainage system, the water and sewer lines, the lot layout, and the grading. Our master-planning goal was to minimize the costs of such a large-scale site while striving for the highest quality development and maintaining the integrity of the land plan. To facilitate and ensure the success of the Promontory Project, we worked with the developer, surveyor, planner, traffic engineer, and City representatives during this process in as a means of resolving key development issues.