Total organochlorine pesticides plus PCBs should be less than 50 ng/L (APHA, 1992).
Failure to keep levels below 50 ng/L will result in heavy penalties.
mnli hypothesis: Failure to keep levels below 50 ng/L will result in heavy penalties. premise: Total organochlorine pesticides plus PCBs should be less than 50 ng/L (APHA, 1992).