Radon mitigation follow-up

Thanks to everyone for their input on my post from 9/29. Thought you might like to know how the company visits went.
3 quotes 2 companies came to my house. 1 gave me a price over the phone. They didn't think they needed to come to my house (???) $850.00
First guy wanted to do diagnostics to see if radon mitigation would actually work. Thought it wouldn't work because I have a sump pump and if there was water 2 feet under the slab. $500.00 for diagnostics. The news that we probably couldn't remediate the radon got me a little freaked. He then proceeded to tell me the pipe had to go to soil under the slab. Then I knew he was a whacked.
Second guy...local, friendly, thought the first guy was wrong. Offered guarantee to reduce radon to 4, showed me exactly how he would run the pipe and where the hole would be drilled. I need to run the electrical for the fan. $750.00
Hired the second guy.
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