Need help creating a bubble chart with threshold boundary

I’m sorry I’ve to ask again, but I desperately need some help.

I’ve already asked this on stackoverflow as well, but did not receive any help. Am I missing something in my question or certain things aren’t clear? Please let me know. I’m not going to explain it again here, instead I’ll provide the link to my question.

My question : javascript - Creating a bubble chart in d3 js with a threshold boundary - Stack Overflow

Any kind of help would be appreciated.