The seasonal industrial wastewater (SIW) treatment system is one of the major components of the Eugene/Springfield regional wastewater management program. This system is designed to collect, treat, an dispose of the food processing wastes generated by Agripac, Inc., in the most cost-effective and environmentally sound manner. Agripac produces an extremely high-strength waste for several months of the year, with biochemical oxygen demand (BOD) and suspended solids values exceeding 45,000 pounds per day (ppd) during the maximum week. For this reason, a separate treatment and disposal system relying on spray irrigation rather than processing at the regional treatment plant has been developed.