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(18) Any waters or wastes in which the total fixed solids <br /> exceed 1,500 mg/1. <br /> <br /> {lg) Any waters or wastes in which the ammonia exceeds 15 <br /> rog/1. <br /> <br /> (20) Any waters or wastes containing amounts of chromium, zinc, <br /> nickel, copper, or other heavy metals which are in an ionic or chemically <br /> active state. <br /> <br /> (21) Any waters or wastes containing cyanide or other such <br /> poisonous substances. <br /> <br /> (22) Any waters or wastes containing suspended solids of such <br /> character and quality that unusual attention or expense is required to <br /> handle such materials at the waste treatment plant. <br /> <br /> {23) Any waters or wastes which, in concentration of any given <br /> constitueot of in quantity of flow, exceeds for any period of duration <br /> longer than fifteen (~$) minutes more than five (5) times the average <br /> twenty-four (24) hour concentrations or flows during normal operation. <br /> <br /> (24) Any water or wastes having an Objectionable color which is <br /> not sufficiently removable in the existing sewage treatment plant <br /> processes to pass receiving stream standards. <br /> <br /> (b) Limitations on Wastewater Discharges. No person shall <br />discharge or convey, or permit or allow to be discharged or conveyed, to <br />a public sewer any wastewater containing pollutants of such character or <br />quantity that will: <br /> <br /> (1) Not be susceptible to treatment or interfere with the <br />process or efficiency of the treatment system, <br /> <br /> (2) Constitute a hazard to human or animal life, or to the <br />stream or water course receiving the treatment plant effluent. <br /> <br /> (3) Violate pretreatment standards, as promulgated by the <br />United States Environmental Protection Aguncy in 40 CFR, Parts 403 and <br />128, the State of North Carolina, or the City of Concord, North <br />Carolina, or the County of Cabarrus, North Carolina. <br /> <br /> (4) Cause the treatment plant to violate its NPDES permit or <br />applicable receiving water standards. <br /> <br /> (c) Special Agreements. Nothing in this section shall be construed <br />as preventing any special agreement or arrangement between the Board and <br />any user of the wa stewater treatment system whereby wastewater of unusual <br />strength or character is accepted into the system and specially treated <br />subject to any payments or user charges as may be applicable. <br /> <br /> id) No person shall discharge or cause to be discharged any storm <br />water, surface water, ground water, roof runoff, or subsurface drainage <br />into any sanitary sewer. No person shall connect, or cause to be <br /> <br /> <br />