It's very, very hard to read an exact number on the CYA test--that's why it's a ballpark at best. Also, since the CYA is using turbidity of the water as an indicator, running the test with water that is cloudy to begin with can give you falsely high results. However, it's better to overchlorinate than underchlorinate, so... Using 100 as your number, then you need to be keeping your chlorine no less than 8 ppm, so you definitely need to get some chlorine in there ASAP.

Hopefully you can find your leak without too much of a problem--if all else fails, you can always just let the water continue to drain out--when the water level gets to the level of the leak, it will stop and at least give you a place to start looking!

Janet