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complete substitute for adequate treatment to achieve compliance with the limitations contained in the National Categorical Pretreatment Standards, unless expressly authorized by an applicable pretreatment standard, or in any other pollutant - specific limitation developed by WSACC or State. 2.7 Pretreatment of Wastewa (a) Pretreatment Facilities Users shall provide wastewater treatment as necessary to comply with this ordinance, and wastewater permits issued under Section 4.2 of this ordinance and shall achieve compliance with all national categorical pretreatment standards, local limits and the prohibitions set out in Section 2.1 of the ordinance within the time limitations as specified by the EPA, the State, or the Executive Director, whichever is more stringent. Any facilities necessary for compliance shall be provided, operated, and maintained at the user's expense. Users shall not discharge wastewater requiring treatment either directly or indirectly to WSACC's wastewater treatment system without first notifying and obtaining approval fi the Executive Director. Detailed plans for the pretreatment facilities signed and sealed by a North Carolina Professional Engineer shall be delivered to and received by WSACC for review and an "Authorization to Construct" shall be issued by WSACC prior to construction of the pretreatment facilities. The user shall be solely responsible for the design, construction and operation of such pretreatment facilities as may be necessary to comply with the provisions of this ordinance. The review of such plans and operating procedures and the issuance of the "Authorization to Construct" will in no way relieve the user fi the responsibility of modifying the facilities as necessary to produce an effluent acceptable to WSACC under the provisions of this ordinance. Any subsequent changes in the pretreatment facilities or method of operation shall be reported to and be approved by the Executive Director prior to the user's initiation of the changes. (b) Additional Pretreatment Measures (1) Whenever deemed necessary, the Executive Director may require users to restrict their discharge during peak flow periods, designate that certain wastewater be discharged only into specific sewers, relocate and/or consolidate points of discharge, separate sewage waste streams from industrial waste steams, and such other conditions as may be necessary to protect the PQTW and determine the user's compliance with the requirements of this ordinance. Suspension of wastewater treatment service shall be subject to Section 8.1(f). (2) Crease, oil and sand interceptors shall be provided when, in the opinion of the Executive Director, they are necessary for the proper handling of wastewater containing excessive amounts of grease and oil, or sand; except that such interceptors shall not be required for residential users. All restaurants and slaughtering operations shall have grease interceptors or grease removal facilities. All interception units shall be of type and capacity approved by the Executive Director and shall be so located to be easily accessible for cleaning and inspection. Such interceptors shall be inspected, cleaned, and repaired regularly, as needed, by the user at their expense. (3) Flow Equalization. The Executive Director may require any person discharging into the PQTW to install and maintain, on the property and at their expense, a suitable storage and flow - control facility to ensure equalization of flow. A wastewater discharge permit may be issued solely for flow equalization. Such facility shall have a capacity of at least eighty (80) percent of the normal volume of one (1) twenty four hour production period of wastewater and outlet to the sewer controlled by a waterworks -type controller, or other approved device, the setting of which shall be directed by the Executive Director. (4) Control Manhole. Any person discharging non - domestic wastewater into WSACC's sanitary sewer 19 Attachment number 4 H -3 Page 274