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Lab Readings in ug/L vs ppb



Can someone tell me how these lab testing results translate into parts per billion (ppb)?
 
Thanks for your help.
 
Cheers,
Donald Sutherland
 
Eastern Range Detected Average
 2001 ND-1.45 ug/L 0.47 ug/L
 
Western 
2001 ND-1.56 ug/L 0.64 ug/L
 
Southern 
2001 ND-2.38 ug/L 0.94 ug/L