John demonstrated commitment to his work, as we had to cancel our first appointment. John quickly got us back on his schedule within 7 days from our first appointment.Assessment of our need regarding piping and sealant of our crawlspace came next. After a thorough assessment of our needs. John took me on a tour of the inner workings of my house and the dirt pack beneath it to explain what was needed and why.We had determined our need by doing our own Radon test and checking how prevalent increased Radon was in Kansas. The test showed our Radon level to be 4.9. About 98% of Kansas has a Radon level greater than 4.0.We were on John's schedule for Radon mitigation. John arrived on time and worked steadily, from 9 am until he was finished, around 6 pm. He cleaned his worksite in our basement. He explained how all of the equipment would work, prior to installation and demonstrated it in action, after installation.John had me re-check the Radon level (he provided the test kit) at 3 days. The Radon level with the mitigation plan working is less than 1.0!John was very patient despite encountering our 2 vicious(?) dogs (min-pin & dachshund) trying to protect their house from, a perceived attack from, John. lol's Excellent workmanship, very conscious of my need to know, and eager to make sure the system is working. I highly recommend Clarity Radon Mitigation service. Their price was very reasonable and they stand behind their work.