A. Sewers:
1. Wastewater, waste, or any matter having any of the following characteristics or constituents shall not, under any circumstance, be discharged into, be placed where they might find their way into, or be allowed to run, leak or escape into any part of the sewer system:
a. Ashes, cinders, sand, earth, coal, rubbish or any matter which is chemically or physically stable for at least five (5) days at twenty degrees centigrade (20°C) or which would form a deposit or obstruction or damage or reduce the capacity of the sewer into which it was placed;
b. Inflammable, explosive or poisonous liquids, gases or solids or any matter which after entrance into a sewer might reasonably be expected to form into flammable, explosive or poisonous liquids, gases or solids;
c. Liquid matter of any nature containing suspended solids in excess of one thousand (1,000) parts per million;
d. Matter of any nature containing five (5) day biochemical oxygen demand in excess of three hundred milligrams per liter (300 mg/l);
e. Animal or vegetable greases, oils or matter containing animal or vegetable greases or oils of any nature in excess of three hundred (300) parts per million;
f. Liquid matter with a log hydrogen ion (pH) concentration below 5.5 or above 9.0 measured at the point where discharge enters the sewer main;
g. Any matter that would be poisonous to or inhibit the biologic organisms associated with any sewage treatment process, and which in the opinion of the department, might interfere with the satisfactory operation of any treatment facility or any portion of the sewer system.
2. Upon obtaining the written approval of the director, sewage wastes or other matter herein excluded may be discharged into the sewage system upon the payment to the city of the additional costs for processing the same as hereinafter provided and set forth. (1973 Code § 13.40.020)
B. Storm Drains: In addition to the matter excluded heretofore, all other matter of any nature shall be excluded from those parts of the sewer system designated by the director as storm sewers, excepting only surface drainage waters. All drainage waters shall be directed into storm sewers only under the authorization and direction of the director. (1973 Code § 13.40.030)
C. Sanitary Sewers: In addition to the matter excluded heretofore, all surface drainage water (inflow) shall be excluded from all parts of the sewer system designated by the director as the sanitary sewer system. (1973 Code § 13.40.040)