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515 (f) Ail applications for the discharge of industrial wastes into the public sewers shall be made to the City. Approval will be granted such applications when evidence is submitted by the applicant that the discharge of wastes into the public sewer will comply with this Ordinance and applicable City, State and Federal requirements. (g) Grease, oil and sand interceptors shall be provided when, in the opinion of the County, they are necessary for the proper handling of liquid wastes containing grease in excessive amounts, or any flammable wastes, sand or other harmful ingredients; except that such interceptors shall not be required for private living quarters or dwelling units. Ail interceptors shall be maintained by the Owner at his expense in continuously efficient operation at all times. (h) Where preliminary treatment or holding facilities are provided for any purpose, they shall be maintained continously in satisfactory and effective operation by the owner at his expense, and there shall be no discharge of wastes requiring pretreatment~either directly or indirectly to the County's sewer system, without first notifying and obtaining approval from the County and City. Section IV - Powers and Authority for Inspection (a) The County Manager and duly authorized employees of the Board shall be permitted to enter upon all properties for the purpose of inspection, observation, measurement, sampling and testing in accordance with the provisions of this Ordinance. (b) Ail tests and analyses of the characteristics of waters and wastes to which reference is made in this Ordinance shall be made in accordance with the procedure given in the latest edition of STANDARD M~THODS FOR THE EXAMINATION OF WATER, SEWAGE AND INDUSTRIAL WASTES published by the American Public Health Association. Such tests and analyses shall be determined at the control manhole provided for in Section III, or at the point of discharge of any waters or wastes at the site of their origin on the premises of any person discharging such wastes into the sanitary sewers. Section V - Measurement and~Flow (a) The volume of flow used in determining the total discharge of industrial wastes shall be based upon: (1) Metered water consumption as shown in the records of meter readings maintained by the Board. In the event that a person discharging wastes into the public sewers produces evidence to the County that more than 25% of the total annual volume of water used for all purposes does not reach the public sewers, the individual discharger may, at his option, install flow measuring devices, which measure the actual volume of wastewater discharged to the sewer. Such devices shall be accessibly and safely located, and the measuring system as specified by the Board shall be installed in accordance with plans approved by the County. The metering system shall be installed and maintained at the owner's expense according to arrangements that may be made with the Board. (b) Where any person discharging wastes to the sanitary sewers procures all or any part of his water supply from sources other than the Board, the person discharging said waste shall install and maintain at his expense water meters of a type approved by the approving authority for the purposes of determining the proper volume of waste discharged to such sewers. Section VI - Determination of Character and Concentration of~Wastes (a) Inspection. The industrial waste of each person discharging such wastes into the public sewers shall be subject to periodic inspection and a determination of character and concentration of such wastes shall be made monthly for all "major" contributors and annually or more often as may be deemed necessary by the County Manager or his authorized assistant for the "minor" contributors. Such inspection and tests shall also be made immediately after any process change which may affect the quantity or quality of the wastes discharged. The determination of "major" and "minor" contributor classifications shall be by the County Manager. (b) Samples.. Samples shall be collected in such manner as to be representative of the actual quality of the waste. Laboratory methods used in the examination of such waste shall be those set ~orth in STANDARD METHODS as hereinbefore described.