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KEY TO ABBREVIATIONS and OD REFERENCES < Less than; When appearing in results column indicates analyte not detected at the value following. This datura supercedes the listed Reporting Limit. * Reporting Limits are a function of the dilution factor for any given sample. To obtain the actual reporting limits for this sample, multiply the stated Reporting Limits by the dilution factor (but do not multiply reported values) . ICVS Initial Calibration Verification Standard (External Standard) . mean Average; sum of measurements divided by number of measurements. mg/Kg (ppm) : Concentration in units of milligrams of analyte per kilogram of sample, wet-weight basis (parts per million) . mg/L Concentration in units of milligrams of analyte per liter of sample. mL/L/hr Milliliters per liter per hour. MPN/200 mL Most probable number of bacteria per one hundred milliliters of sample. N/A Not applicable. NA Not analyzed. . ND Not detected; the analyte concentration is less than applicable listed reporting limit. NTU Nephelometric turbidity units. RPO Relative percent difference, 100 [Value 1 - Value 2]/mean value. SNA Standard not available. ug/Kg (ppb) Concentration in units of micrograms of analyte per kilogram of sample, wet-weight basis (parts per billion) . ug/L Concentration in units of micrograms of analyte per liter of sample. umhos/cm Micromhos per centimeter. Method References Methods 100 through 493: see "Methods for Chemical Analysis of Water & Wastes", U.S. EPA, 600/4-79-020, rev. 1983. Methods 601 thresh 625: see "Guidelines Establishing Test Procedures for the Analysis of Pollutants" U.S. EPA, 40 CFR, Part 136, rev. 1988. Methods 1000 through 9999: see "Test Methods for Evaluating Solid Waste", U.S. EPA SW-846, 3rd edition, 1986. SM: see "Standard Methods for the Examination of Water & Wastewater, 17th Edition, APHA, 1989.