6. The effluent from any treatment plant must comply with the following standards:
(1) the 5-day carbonaceous biochemical oxygen demand (CBOD5) must be less than or equal to 25 mg/l;
(2) the concentration of suspended solids (SS) must be less than or equal to 25 mg/l, except if it is shown that the excess is caused by algae proliferating in sewage lagoons;
(3) the pH value must be between 6.0 and 9.5.
Compliance of the concentrations provided for in subparagraphs 1 and 2 of the first paragraph is assessed periodically on the basis of an average effluent discharge calculated for the periods listed in Schedule I.
The operator of a treatment plant must collect samples or take measurements of the effluent from its plant at the frequencies provided for in Schedule I and the operator must analyze them according to the procedure established in the Schedule.