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Scientific Investigations Report 2009–5025

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2009–5025

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Conversion Factors and Datums

Conversion Factors

Multiply By To obtain
meter (m) 3.281 foot (ft)
kilometer (km) 0.6214 mile (mi)
square kilometer (km2) 0.3861 square mile (mi2)
milliliter (mL) 0.03381 fluid ounce (oz)
liter (L) 1.057 quart (qt)
milligram per liter (mg/L) 1 part per million (ppm)
milligram (mg) 0.00003527 ounce, avoirdupois (oz)
microgram per liter (µg/L) 1 part per billion (ppb)
micrometer (µm) 3.937 × 10–5 inch (in.)

Temperature in degrees Celsius (°C) can be converted to degrees Fahrenheit (°F) as follows:

°F=(1.8×°C)+32.

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25°C).

Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). One thousand micrograms per liter is equivalent to 1 milligram per liter. Milligrams per liter is equivalent to parts per million. Micrograms per liter is equivalent to parts per billion.

Datums

In this report, the term “elevation” refers to distance above the National Geodetic Vertical Datum of 1929 (NGVD 29).

Horizontal coordinate information is referenced to the North American Datum of 1927 (NAD 27).

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