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<br />discharged, on approval of the City Engineer, to a storm sewer or
<br />natural outlet.
<br />(2) Roof runoff is required to be directed by a downspout or roof drain
<br />away from a building by means of underground storm sewer piping.
<br />Such storm sewer piping shall be constructed in accordance with
<br />standards set by the City Engineer and shall discharge to a storm
<br />sewer. In the event that a storm sewer is not readily available, as
<br />determined by the City Engineer, to serve storm sewer piping for
<br />roof runoff, then such roof runoff may be discharged by
<br />underground storm sewer piping to a ditch or stream or to a leaching
<br />bed designed and constructed in accordance with standards set by the
<br />City Engineer. Splash blocks may only be used when authorized
<br />under the provisions of Section 911.19, or for small roof areas such
<br />as sheds or garages accessory to existing single family residences
<br />when approved by the City Engineer, and no water is allowed to
<br />drain onto adjacent property, accumulate in depressions or otherwise
<br />become a public hazard or nuisance.
<br />(c) No person shall discharge or cause to be discharged any of the following
<br />described waters or wastes into any public sewers:
<br />(1) Any wastewater having a temperature which will inhibit biological
<br /> activity in the POTW treatment plant resulting in interference; but in
<br /> no case, wastewater with a temperature at the introduction into the
<br /> POTW which exceeds forty degrees Centigrade, 104 degrees
<br /> Fahrenheit.
<br />(2) Any gasoline, benzene, naphtha, fuel oil or other flammable or
<br /> explosive liquids, solids or gases which by reason of their nature or
<br /> quantity are or may be sufficient, either alone or by interaction, to
<br /> cause fire or explosion or be injurious in any other way to thc.
<br /> operation of the POTW. Under no circumstances shall the flashpoint
<br /> of any discharge be less than 140 degrees Fahrenheit or sixty degrees
<br /> Centigrade as measured using the closed cup test method specified in
<br /> 40 CFR 261.21.
<br />(3) Any discharge of petroleum oil, nonbiodegradeable cutting oil or
<br /> products of mineral oil origin in amounts that can cause interference
<br /> or pass through; but in no case, water or wastes containing free oils,
<br /> emulsified oils and grease exceeding an average of 100 parts per
<br /> million or 833 pounds per million gallons, of ether soluble matter.
<br />(4) Any waters or wastes containing toxic or poisonous solids, liquids or
<br /> gases in sufficient quantity, either singly or by interaction with other
<br /> quantity, either singly or by interaction with other wastes, to injury
<br /> or interfere with any sewage treatment process, constitute a hazard to
<br /> humans or animals, create a public nuisance or create any hazard in
<br /> the receiving waters of the sewage treatment plant, mcluding
<br /> cyanides.
<br />(5) Any garbage that has not been properly shredded. The installation
<br /> and operation of any garbage grinder equipped with a motor of three-
<br /> fourths horsepower, 0.76 hp metric, or greater shall be subject to the
<br /> review and approval of the Building Commissioner.
<br />(6) Any ashes, cinders, sand, mud, straw, shavings, metal, glass, rags,
<br /> feathers, tar plastics, wood paunch, manure, hair and fleshings,
<br /> entrails, lime slurry, lime residues, chemical residues, pamt
<br /> residues, cannery waste, bulk solids or any other solid or viscous
<br /> substance capable of causing obstruction to the flow in sewers or
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