Alta 99th Avenue Apartments

Located on a 20-acre site, Alta 99th consists of 13 three-story apartment buildings, an amenity building, a pool area, a dog park, a sand volleyball court, and a pickleball court. Langan’s scope included an engineered site plan and plans for grading and drainage, private utilities, fire hydrants, stormwater management, offsite paving, and signage and striping. We conducted detailed stormwater retention calculations and designed a storm drain collection system to convey onsite stormwater to an interior common area, as the project did not allow for the use of typical underground storage systems. We also designed a “low flow” gravity sewer system that connects to the public main system in accordance with city requirements.