26. The waters from a quarry or sand pit and discharged into the environment must meet the following standards:(1) the quantity of petroleum hydrocarbons (C10-C50) contained in the waters is less than or equal to 2 mg/l;
(2) the quantity of suspended matter contained in the waters is less than or equal to 50 mg/l;
(3) the waters’ pH ranges from 6 to 9.5.