Thanks to everybody for all of the replies.
I did not replace the seal.
Not sure how high of a reading I got inside the house as this was months ago and I don't remember.
Anyhow, the Chlorination did not work. I got a positive test on Fecal Coliform just a week after chlorinating the well.
I think I have decided that it will be cheaper to just install a chlorinator, I have a supplier nearby that can supply me 12% sodium hypochlorite that I use for my pool.
So... the questions is, should I bother going through several rounds of chlorinating the well? Or just cave and install a chlorinator? I am thinking that hiring a well man to come out with a camera will just be more expensive, and he may not find the source of the contamination, like a cracked casing.
If the chlorinator is the easier/cheaper way to go, is there any advise? I am a complete novice and wouldn't really know where to start.
Thanks in advance.