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. e ORDINANCE NO. ~c{~/ Page 10 (3) Maintain the trap in effective operating condition. . SECTION 14. REQUIREMENTS FOR BUILDING SEWERS. (a) Any person responsible for discharges through a building sewer carrying industrial wastes shall, at his own expense and as required by the Approving Authority (1) Install an accessible control manhole; (2) Install meters and other appurtenances to facilitate observation sampling and measurement of the waste; and (3) Install safety equipment and .faci1ities (ventila- tion, steps...) where needed. (4) Maintain the equipment and facilities. SECTION 15. SAMPLING AND TESTING. e (a) Sampling shall be conducted according to customarily accepted methods, reflecting the effect of constituents upon the sewage works and determining the existence of hazards to health, life, limb, and property. (NOTE: The particular analysis involved will determine whether a twenty-four (24) hour composite sample from all outfa11s of a premise is appropriate or whether a grab sample or samples should be taken. Normally, but not always, BOD and suspended solids analyses are ob- tained from 24-hour composites of all outfal1s. Where applicable, 16-hour, 8-hour or some other period may be required. periodic grab samples are used to deter- mine pH and oil and grease.) (b) Examination and analyses of the characteristics of waters and wastes required by the ordinance shall be (1) Conducted in accordance with the latest edition of "Standard Methods"; and e (2) Determined from suitable samples taken at the control manhole provided or other control point authorized by the Approving Authority. (c) BOD and suspended solids shall be determined from com- posite sampling, except to detect unauthorized discharges. (d) The Approving Authority shall determine which users or classes of users may contribute wastewater which is of greater strength than normal domestic wastewater. All users or classes of users so identified shall be sampled for flow BOD, TSS and pH at least annually. (e) City may select an independent firm or laboratory to determine flow, BOD, and suspended solids, if necessary. Flow may alternately be determined by water meter measure- ments if no other flow device is available and not other source of raw water is used. SECTION 16. USER CHARGE SYSTEM. . (a) Persons making discharges of industrial waste into the City of La Porte system shall pay a charge to cover all costs of collection and treatment.