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"Instantaneous Instantaneous maximumn means the highest concentration or other measure of pollutant magnitude taken at any discrete point in time. (o) "Instantaneous minimum" means" the lowest concentration or other measure of pollutant magnitude taken at any discrete point in. time. (p) "Interceptor" means a receptacle or trap designed and constructed to intercept, separate, and prevent the passage of prohibited substances into the sewer system. (q) sources" New shall mean sources of industrial waste that commence discharging subsequent to the effective date of this section. (r) "Organic solvent" means any solvent which contains carbon in its molecular structure. (s) "Person" means any individual, partnership, firm, association, corporation or public agency. (t) "Plant" means the Palo Alto Regional Water Quality Control Plant. (u) "Point of discharge" means the point or points designated as such in the permit. Where. no designation is made it shall mean the point where the private sewer joins a public sewer. (v) "Pretreatment system" means a treatment system at an industrial or commercial facility that is designed to treat water prior to entering the City' s sewer system. (w) "Sanitary sewage" means water-carried wastes from residences, business property, institutions and industrial property excluding ground, surface, and storm waters and industrial wastes. (x) "Secondary containment" means the level of containment external to and separate from the primary containment. (y) "Seepage pit" means a device comprised of one or more pits extending into porous strata, lined with open- jointed masonry or similar walls, capped and provided with a means of access such as a manhole cover and into which wastewater disposal system effluent is discharged. (z) "Sewage treatment plant" means any arrangement of devices and structures used for treating sanitary sewage and industrial wastes. 3 -