§ 420.02 General definitions.
In addition to the definitions set forth in 40 CFR part 401, the following definitions apply to this part:
(a) The term TSS (or total suspended solids, or total suspended residue) means the value obtained by the method specified in 40 CFR 136.3.
(b) The term oil and grease (or O&G) means the value obtained by the method specified in 40 CFR 136.3.
(c) The term ammonia-N (or ammonia-nitrogen) means the value obtained by manual distillation (at pH 9.5) followed by the Nesslerization method specified in 40 CFR 136.3.
(d) The term cyanide means total cyanide and is determined by the method specified in 40 CFR 136.3.
(e) The term phenols 4AAP (or phenolic compounds) means the value obtained by the method specified in 40 CFR 136.3.
(f) The term TRC (or total residual chlorine) means the value obtained by the iodometric titration with an amperometric endpoint method specified in 40 CFR 136.3.