On Bing maps the former SONGS designed mystery sirens that everyone calls Toshibas and STL-10s are still visible using the birds eye view tool ,I could only find a few of the old sirens including STL-10s since most of the sites have the replacement Whelen 2800s. Which the Whelens started being put up in around early 2006 in place of the mystery octagon shaped sirens and STL-10s. Since I could only find about 5 of the old sirens ,the image must be from Feb 2006 since in Mar 2006 all the Whelens have been finally installed. I also found the guy who designed these sirens. I will let you guys know when he calls me back since I'm currently waiting to ask him about how these old sirens worked ,and if he has a tape or audio recording of these sirens. After the Whelens were installed the STL-10s went to Curry County Oregon and are used for Tsunamis ,The mystery sirens weren't announced on if they were going anywhere ,but my guess is there in storage down by the plant or something.
Anyway here is screen shots of all the old sirens I could find.