Seattle Public high schools have a wide variety of really good science classes. They range from the BioTech program at Ballard (celebrating its 10th year in 2011) to Marine Science to Forensics and many others. Here is a link to the SPS page on this issue.
The district is now moving onto science curriculum alignment as part of their overall alignment process. I do understand the idea of alignment so that students who move from school to school (and it happens more than you might think) will find the same level of instruction. This is fine.
The issue is that the district wants to make 4 science classes mandatory for graduation. Those classes are physical science, biology, chemistry and physics.
What that means is that most of the other science classes, unless they get certified as a substitute for one of the four, will be electives (AP and IB science courses will also count as substitutes). With so many other subject requirements for graduation, it is unlikely that most of the elective science classes would survive. It would be a big loss.