There’s a video of both the STH-10 and STL-10 going off with ambience.

There’s also an STL-10 near by down the road at the Howard Faust treatment plant which is another water plant. So Chesterfield has an active STH-10 and STL-10.

1995 and if this is involving San Onofre 2006 was the final year they were produced. San Onofre has some of the last installed.

Actually it’s in Orange County not LA County. It’s near the LA and Orange County Line and Long Beach

Passed by the Seal Beach Naval Weapons Station in Seal Beach yesterday while on the freeway and noticed a brand new Modulator II siren on the base. This is the first and only Modulator in the Los Angeles Area. There is a Mod II also down on Point Loma in San Diego. The Mod is very difficult to see f...

Wasn’t there a few sentrys in the old system as well? I wonder what happened to those. I saw you made a thread on that

Well I guess we finnaly know what happened to the Model 120 sirens. Can a screenshot of the email be posted?

Your welcome. Also I did want to metion that down in Point Loma in San Diego there’s a fairly new Mod II Siren.

Many times when going to San Diego I’ve noticed at a beach near SONGS there is one of those WAVES style sirens. I’ve noticed them around Camp Pendleton in several areas but this one is easy to notice. Figured I’d share this since there’s a couple of these around SONGS on Camp Pendleton and nobody ha...

Patent Link
https://www.google.com/patents/US480720 ... hDoAQhIMAU