This publication provides introductory technical guidance for civil engineers, environmental engineers and other professional engineers, construction managers and facility operators interested in collection and treatment of oil wastewater. Here is what is discussed: 1. OBJECTIVES, 2. SOURCES, 3. DISCHARGE CRITERIA, 4. POINT SOURCE CONTROL, 5. DISPOSAL OF OIL, 6. EMERGENCY CONTAINMENT AND CLEANUP, 7. OILY WASTEWATER CHARACTERISTICS, 8. COLLECTION AND TRANSFER, 9. OILY WASTEWATER TREATMENT, 10. DESIGN CRITERIA FOR OIL-WATER SEPARATORS AND APPURTENANCES.