They include light alcohols, acetone, trichloroethylene, perchloroethylene, dichloroethylene, benzene, vinyl chloride, toluene, and methylene chloride. These potentially toxic chemicals are used as solvents, degreasers, paints, thinners, and fuels. Because of their volatile nature, they readily evaporate into the air, increasing the potential exposure to humans. Due to their low water solubility, environmental persistence, and widespread industrial use, they are commonly found in soil and water. This type of rock may or may not be very permeable.
V is the velocity of the liquid or gas.
A marked drop in volume indicates a leak. A spiral motion of fluid within a limited area, especially a whirling mass of water or air that sucks everything near it toward its center. This whirlpool is caused by water flowing out of a small opening in the bottom of a basin or reservoir. A funnel-shaped opening is created downward from the water surface. U-Shaped Valleys , by contrast, are characteristic of glacial erosion.