Aspect designed an innovative media-filtration treatment system to complete a Level 3 Corrective Action at a 5-acre auto-recycling facility as a component of settling a Clean Water Act citizen suit. Our design was aimed at treating low to moderate levels of copper and turbidity. The media bed consisted of oyster shells over a bioretention soil mix. The system was constructed by the client at low cost. The client has not triggered a Level 2 or 3 Corrective Action since installation of the system.