1.  Reported levels can be maximum or average values depending on regulatory reporting requirements.  2.  Range shows the highest and lowest reported values for a data set.  Range is only reported if there were two or more data points.  3. HCCPD is an abbreviation for Hexachlorocyclopentadiene--a chemical used in industrial applications.   
4.  Turbidity is a measure of the clarity of water.  Turbidity levels are monitored to indicate the effectiveness of our filtration system.