Local Limits

Any and all individual discharges to the public sewer shall NOT contain pollutant levels exceeding the following concentrations (as per Sec. 26-40., Discharge of Heavy Metals as Toxic Materials of the Code of the City of Roanoke 1979, as amended):

Metals
Arsenic	0.18 mg/L	Manganese	1.0mg/L
Barium	5.0 mg/L	Mercury	0.003 mg.L
Boron	1.0 mg/L	Nickel	0.23 mg/L
Cadmium	0.03 mg/L	Selenium	0.02 mg/L
Chromium, Total	1.95 mg/L	Silver	0.54 mg/L
Chromium VI	0.06 mg/L	Zinc	0.8 mg/L
Copper	0.68 mg/L	Antimony	1.0 mg/L
Lead	0.3 mg/L	Beryllium	1.0 mg/L

Parameters
pH	> or equal to 5.0	TPH	200 mg/L
Dissolved Solids, including Sodium Chloride Sodium Sulfate	500 mg/L	Substances causing excessive discoloration
Inert Solids(Suspended),e.g.: Fullers earth Lime Slurries Lime Residues	250 mg/L	Fluoride other than that contained in the public water supply	>12 mg/L
Temperature	150 F(65 C)	Benzene,Toluene, Ethylbenzene and Xylene (B.T.E.X.)	< or equal to 5.0 mg/L
Cyanide (CN)	0.06 ppm	Color due to dyes	750 A.D.M.I.
Oil and Grease	200 mg/L