Attribute: ALKCODE_MO

code  description    
*    Monthly value includes one or more values measured below the detection limit     
A    Accepted monthly value     
E    Monthly value includes estimated values     
I    Monthly value incomplete - at least 5 days available, but 25 or fewer days available for month summary     
N    No analyses conducted for proportional samples taken during the month     
Q    Monthly value includes questionable sample values