These are Gulf of Mexico Offshore Oil and Gas platforms (ships) with NPDES discharge permits. Due to changes in the permit language effective Feb. 16, 2002, Respondent is changing drilling muds to begin using compliant fluids. The transition will result in a diminimus mixing of non-compliant fluids in the initial discharges. This settlement is to resolve the discharges using non-compliant muds (Ecoflow) in the transition to the new compliant fluids. The new fluids will be more protective of water quality standards, particularly in regards to toxicity. Unocal is transtioning all of their OCS facilities in the western portion of the Gulf of Mexico to compliant fluids as part of this settlement.