Research, development and demonstration efforts sponsored by the Environmental Protection Agency since 1966 have resulted in advances in technology which can be applied as alternatives to sewer separation for abating pollution from combined sewers. All the sewerage facilities (the system) must be evaluated in order to plan modifications which will provide the capability to adequately control and treat wastewaters during and immediately following storm events. Control facilities such as in and off-system storage, flow regulation and routing, remote flow-sensing and control, coupled with treatment, are applicable solutions. These are briefly analyzed in this report. Physical, chemical, biological and physical-chemical treatment methods are under investigation, with a screening, dissolved-air flotation process and a high-rate multi-media filtration process offering the best current potential for producing good quality effluents.