The proposed amendments to the Water Pollution Regulations identified as 'Docket A' of the IEPA Proposal R77-12 consist of several definition changes, the addition of a new definition, modifications to certain rules, and the addition of a new rule. To facilitate the assessment and discussion of these numerous and diverse amendments, they were grouped into five categories as listed below: (1) Sewer and Sewage Definition Changes, (2) Combined Sewer Regulations Changes, (3) Secondary Contact Water Quality Standard Changes, (4) Dilution Ratio Definition, and (5) Implementation Plan Changes. These amendments and the significant benefits and costs resulting from them are summarized. (Portions of this document are not fully legible)