c s o - s s o a n d s t o r m w a t e r s e r v i c e s V:\CompanySOQs\GeneralWtr&WWSOQ\Sections\10CSO-SSO&StormWtrSvs\Cso-Sso&StormWtrSvcs.indd-149 1/7/05 149 CITY OF PORTLAND, OREGON Carollo uses models such as US EPA’s SWMM to evaluate wastewater collection systems and recommend improvements for CSO control. H I G H L I G H T S Replacement of 34,250 feet of 6-inch to 48-inch sewer in Portland city streets to reduce CSO discharges. Design

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