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TPH-D: Total petroleum hydrocarbons as diesel <br /> TPH-G: Total petroleum hydrocarbons as gasoline <br /> mg/kg: Milligrams per kilogram <br /> ND: Not detected at or above laboratory detection limit (see laboratory report for specific analyses) <br /> NA: Not Analyzed <br /> mg/L: Milligrams per liter <br /> pg/L: Micrograms per liter <br />