Conversion Factors, Datums, and Abbreviations and Acronyms


Conversion Factors


Inch/Pound to SI


Multiply	By	To obtain
foot (ft)	0.3048	meter (m)
mile (mi)	1.609	kilometer (km)
square mile (mi2)	2.590	square kilometer (km2)
cubic foot per second (ft3/s)	0.02832	cubic meter per second (m3/s)
million gallons per day (Mgal/d)	1.547	cubic meter per second (m3/s)

SI to Inch/Pound


Multiply	By	To obtain
gram per day (g/d)	0.03527	ounce, avoirdupois (oz)
liter (L)	0.2642	gallon (gal)
liter per day (L/d)	0.2642	gallon per day (gal/d)

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


°F=(1.8×°C)+32.


Concentrations of chemical constituents in water are given either in milligrams per liter (mg/L), micrograms per liter (µg/L), or nanograms per liter (ng/L).


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


CAS Registry Numbers® is a Registered Trademark of the American Chemical Society. CAS recommends the verification of the CASRNs through CAS Client Services^SM.


Datums


Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88).


Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).


Abbreviations and Acronyms


7Q10	the lowest streamflow for seven consecutive days that occurs on average once every 10 years
AOC	anthropogenic organic compounds
CAS	Chemical Abstracts Service
CERC	Columbia Environmental Research Center
CSO	Combined sewer overflow
E	estimated
EEQ	estradiol equivalent factor
EPA	U.S. Environmental Protection Agency
GC/MS	gas chromatography/mass spectrometry
MDL	Method detection limit
NPDES	National Pollutant Discharge Elimination System
NWQL	National Water-Quality Laboratory
ODEQ	Oregon Department of Environmental Quality
PAH	Polycyclic aromatic hydrocarbons
PBDE	Polybrominated diphenyl ethers
PCB	Polychlorinated biphenyls
PIL	plan initiation level (SB 737)
QC	quality control
RL	Reporting limit
RPD	relative percent difference
SB	Senate Bill
USGS	U.S. Geological Survey
WWTP	Wastewater-treatment plant
YES	Yeast estrogen screen

First posted April 25, 2012