This project is proposing to meet the requirements of EQ 9 in the following way: The homes will be constructed with a structural basement floor. This floor is supported by the foundation walls and creates a "crawlspace" below the basement. The crawlspace is approximately 18"-24" tall, and there is a 10 mil poly barrier directly on the soil. The poly is lapped up onto the foundation wall approximately 10"-12" and is sealed to the concrete face of the wall. All seams in the poly are also lapped and sealed. Additionally all the poly is sealed to all penetrations such as pipe columns and the sump pit. The sump pit remains in the crawl space and does not extend into the basement. The basement floor has a number of transfer grills in the floor, sized to allow a specific volume of air to pass thru them. A continuous duty rated in-line fan is installed in a 6" diameter pipe the connects the crawlspace to the exterior of the home. As the fan operates it draws air from the crawlspace and vents it directly to the exterior. A negative pressure is created in the crawlspace that promotes the movement of air from the positively pressurized basement, thru the transfer grills and into the crawlspace. The movement of air is always from the basement to the crawlspace. There is no air exchange from the crawl space to the basement. Unless something malfunctions, the fan can never be shut off. It is hard-wired to run continuously. The system is equipped with an alarm system where if the fan does malfunction, an alarm will sound and something will have to be done to fix it.The builder will include detailed information about the purpose of the fan, and importance of not ripping the 10 mil poly with regards to radon mitigation, in the homeowner booklet and during the walkthrough.