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1 yd3 / cu yd = 764,554,857.98 µg / mcg
1 µg / mcg = 0.0000000013 yd3 / cu yd
Definition of cubic yards of water provided by WikiPedia
A cubic yard is an Imperial / U.S. customary (non-SI non-metric) unit of volume, used in the United States, Canada, and the UK. It is defined as the volume of a cube with sides of 1 yard (3 feet, 36 inches, 0.9144 metres) in length.
Definition of micro-gram of water provided by SMARTe.org
Concentrations of chemicals in water are typically measured in units of the mass of chemical (milligrams, mg or micrograms, ug) per volume of water (liter, L, l).