PACE was retained by County of San Joaquin to provide preliminary drainage design for the Stockton Airport East development. Stockton Airport East development is a 544-acre industrial and commercial development located east of Stockton Airport runway. PACE provided preliminary drainage design for the Stockton Airport East development. A hydrology study, including onsite hydrology and offsite hydrology, was conducted to estimate design flow rate and runoff volume using San Joaquin County Hydrology Method. The detention basins were proposed to mitigate 100-year 48-hour storm onsite flow. The onsite storm drain system was designed using 10-year 48-hour storm per City of Stockton criteria. Four new drainage alternatives were proposed to solve the drainage problem.