Having worked on the Mt. Si High School campus since 2004, LPD has provided civil site engineering services for a floodway analysis, new tennis courts, a classroom building expansion, and the addition of seven portable classroom buildings. Civil site designs involved grading, drainage, temporary erosion and sediment control (TESC) measures, utilities, sidewalks, and site layout plans.
An intricate floodway analysis and drainage design was necessary for the new gymnasium and athletic complex due to the site being located within the 100-year floodway and 100-year floodplain of the Snoqualmie River. The study results determined that to avoid significant seasonal flooding the football field was constructed on a raised structure.