That's a great document. Here are some quotes without using the forum quoting mechanism. I only searched for references to reentry. I'm sure there are many more interesting details in the document. I also didn't check to see which individual documents these quotes came from (91 uses of "reentry" in the PDF).Page 6-7 had earlier plan:
SpaceX also proposes to add an area southwest of Hawaii, uprange of the passive descent ocean landing area, to account for the potential Starship debris field for the second and third launches of Starship that are not configured to survive atmospheric reentry.
When Starship is not configured to survive atmospheric reentry, Starship would tumble as it descends through the atmosphere and break apart at greater than 50 kilometers (km) above ground level (AGL).
Structural debris of both Starship and Super Heavy is made of inert materials, such as steel, carbon composite, silica heat tiles and is not anticipated to affect water quality. For these reasons, after considering the new information, the chance for marine species to be exposed to the residual propellant is still extremely low and therefore discountable, as the 2022 PEA concluded.
Following the Starship breakup, SpaceX would have a vessel in the area of highest likelihood of debris that would identify large debris for salvage.2,3 SpaceX would use the vessel to survey the debris field for approximately of 24 to 48 hours (using visual survey in the day and onboard vessel radar at night) depending on the outcome of the breakup. The initial survey area would be determined based on last known data location point received from the telemetry on the vehicle upon splashdown.
Super Heavy operations are suborbital and are not considered by the FAA to be a reentry vehicle because they have not completed one orbit around the Earth.
Based on modeling, the area beneath the Super Heavy landing location (31 kilometers offshore) that will receive the maximum overpressure (up to 15 psf) as it is landing would be a maximum of 1.28 kilometers in diameter. The maximum overpressure for a Starship reentry is 2.2 psf
SpaceX will provide notice of the launch and reentry schedule not less than 10 business days in advance of any launch, to the extent reasonably practicable.
SpaceX will submit reentry information, where applicable, at least 30 days prior to scheduled reentry or as soon as practicable for contingency reentry
The fuel is methane, the oxidizer is oxygen, but they together constitute propellant because oxidized methane is ejected (CO2 and H2O).Contradiction in terms? Or at least a hemioxymoron??