Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:°F = 1.8°C +32 WATER-QUALITY UNITS Concentrations of water-quality constituents are given in milligrams per liter (mg/L) and micrograms per liter (µg/L). Milligrams per liter (mg/L) are equivalent to parts per million (ppm). Micrograms per liter (µg/L) are equivalent to parts per billion (ppb). Turbidity is given in nephelometric turbidity units (NTUs), specific conductance in microseimens per centimeter at 25°C, (µS/cm), and bacteria concentrations in colony forming units (CFU) per 100 mL. Water volume is given in units of liters (L), cubic feet (ft 3), and gallons (gal). Rainfall intensity is in inches per hour (in/hr). Loads are in mass or trillion colony forming units (TCFUs) per unit time, per storm, or per year. Yields are given in mass or TCFUs per unit time, storm, or year per unit area.