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shall construct and maintain a suitable control manhole to facilitate observation, measurements and sampling of all wastewater including domestic wastewater from the industry. The corrh•ol manhole shall be constructed downstream from any treatment, storage or other approved system at a suitable and satisfactory location and built in a manner approved by the Executive Director or his designee. (5) Measuring Device. Where a storage tank is not required, the control manhole shall be equipped with a permanent type volume measuring device such as a nozzle, or other device approved by the Executive Director. The manhole shall be installed by the person discharging the wastewater at his own expense and shall be maintained by him so as to be safe, accessible and in proper operating condition at all tunes. (6) Interrupted Service Note. Notice shall be given to the Executive Director or his designee when normal indusby will be interrupted for seventy two (72) hours or longer and wastewater will not be available for discharge, or when a change of process is contemplated or malfunction of the treatment facility occurs or is anticipated which will alter demands on the wastewater treatment facilities. Normal operations shall include allowance for legal holidays and other announced plant shutdowns. (7) Users with the potential to discharge flammable substances may be required to install, maintain and operate, at the user's expense, an approved combustible gas detection meter. (8) WSACC may require a user, who has the potential to discharge wastewater in violation of pretreatment standards, to install, maintain, and operate at the user's expense, an approved pH controller and meter related to pH. Plans for the construction of the equalization tank, control manhole, controlling devices, and volume measuring devices shall be approved by the Executive Director prior to the beginning of construction. 2.8 Accidental Discharge /ShrgControl Plans (a) The Executive Director shall evaluate whether each significant industrial user needs a plan or other action to control or prevent slug discharges as defined in Section 1.2 (a)(55). All SIUs must be evaluated within one year of being designated an SIU. The Executive Director may require any user to develop, submit for approval, and implement such a plan or other specific action. Alternatively, the Executive Director may develop such a plan for any user. (b) Facilities to prevent accidental or slug discharges of prohibited materials shall be provided and maintained at the owner's or user's expense. Detailed plans of the facilities and operating procedures must be delivered to and received by WSACC for review before construction of the facility. Completion of an accidental or slug discharge plan may be required before a wastewater discharge permit will be issued. Review of such plans and operating procedures shall not relieve the STU fi•om the responsibility of modifying the S1U's facilities as necessary to meet the requirements of this ordinance. (c) All SIUs are required to notify the POW immediately of any changes at its facility affecting the potential or spills, and other accidental discharge, discharge of a non - routine, episodic nature, a non- customary batch discharge, or a slug load. Also, see Sections 5.5 and 5.6. (d) An accidental discharge/ slug control plan shall address, at a minimum, the following: (la) Description of discharge practices, including non - routine batch discharges; (2b) Description of stored chemicals; 20 Attachment number 4 H -3 Page 275