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Pg. 3 (r) "Sewerage" shall mean the system of sewers and appurtenances for •the collection, transportation, pumping and treatment of sewage and industrial wastes. (s) "Sewer service charge" shall mean the charge levied by §24-2 on all users of the city sanitary sewerage system, whose wastes do not exceed in strength the concentration values established as representative of normal domestic sewage. (t) "Slug" shall mean any discharge of water, sewage or industrial waste which, in concentration of any given constituent, or in quantity of flow, exceeds for any period of duration longer than fifteen minutes more than five times the average twenty-four hour concentration or flows during_ the normal operation. (u) "Standard Methods" shall mean the examination and analytical procedures set forth in the latest edition, at the time of analysis, of Standard Methods for the Examination of Water and Wastewater as prepared, approved and published jointly by the American Public Health Association, the American Water Works Association and the Water Pollution Control Federation. (v) "Storm sewer or storm drain" shall mean a sewer which carries storm and surface waters and unpolluted drainage but excludes sewage and • industrial wastes. (w) "Storm water run-off" shall mean that portion of the rainfall that is drained into the storm sewers. (x) "Surcharge" shall mean a charge in addition to the water and sewer rates set forth in 924-2 based upon the additional operating cost of treatment for suspended solids, B.O.D. and chlorine demand exceeding the concentration established for "normal domestic sewage". (y) "Suspended solids" shall mean solids that either float on the surface of, or are in suspension in, water, sewage, or other liquids, and which are removable by laboratory filtering. Quantitative determination of suspended solids shall be made in accordance with procedures set forth in "Standard Methods". (z) "Unpolluted water or waste" shall mean any water or waste containing none of the following: Free or emulsified grease or oil, acid or alkali, phenols, or other substances imparting taste and odor in receiving water; toxic or poisonous substances in suspension, colloidal state or solution; and noxious or odorous gases. It shall contain not more than ten parts per million each of suspended solids and B.O.D. The • color shall not exceed 75 Color Units.