the millions of liters of polluted water mixed with fracking lewis returns to the surface where the liquid must be disposed of. often near this with the liquids and volatile compounds can evaporate into the air. for the 8-day year life of the well, trucks must take away the polluted mixture. this can be 50% of everything coming up the well, mostly volatile organic compounds. potential pommells with this process are not just relegated to the fracking of the well but every aspect of reduction. the main is when they leak out of the sides of the shaft into the water table through cracked cases. also, the chemicals are mixed and sofas and stored in a large pond and a must be insulated from the college which is sometimes not done. once it is drilled and production, it can still be invisibly polluted. as much as 9% of the methane and out of theay leak well. most shale basins are even flat and maintain a fairly regular deep layer with you a hard rock contractions that would allow water to move upward. dog did from the university of the free state supported natural gas extraction until he embarked