(a) Each SIU or other discharger designated by the Director shall provide and operate, at the user's expense, a monitoring facility to allow for the inspection, sampling, and flow measurement of each commercial or industrial wastewater discharge. Each monitoring facility shall be situated on the user's premises, except when otherwise approved by the Director. There shall be ample room in or near each monitoring facility to allow sample collection and preparation. The facility and equipment shall be maintained at all times in a safe and proper operating condition at the expense of the user. All monitoring facilities shall be constructed and maintained in accordance with all applicable local construction standards and specifications. Construction shall be completed within ninety (90) days of receipt of written notice from the Director directing the user to construct the facilities unless otherwise specified by the Director.
(b) All users, if directed by the Director, shall have an inspection and sampling manhole with an opening of no less than twenty-four (24) inches in diameter and an internal diameter of no less than forty- eight (48) inches that contains flow measurement, recording and/or sampling equipment as may be required by the County to ensure compliance with this Chapter. The structure may be utilized by the user for the user's monitoring program if approved by the Director. The user shall obtain all required permits prior to construction of a monitoring facility.
(c) SIUs shall be responsible for the collection and testing of self monitoring samples as specified in the user's permit. All tests shall be done in accordance with approved laboratory standards. A copy of the results shall be forwarded directly to the Industrial Pretreatment Section at the Department of Sanitary Sewer Services. Samples shall be representative of the industrial wastewater. Care shall be exercised in the collection of samples to ensure that each sample is preserved in accordance with 40 C.F.R. Section l36.3(e).
(d) The frequency of monitoring by SIUs shall be as specified in the applicable national categorical pretreatment standards or at intervals determined by the Director. If pollutant concentration in the discharge varies significantly, or if the likelihood of a pollutant slug is so great that a “grab” sample of the wastewater is not representative of the wastewater, the County may require the installation of flow-proportional or time-proportional composite samplers.
(Ord. 2008-375. Adopted 9-29-08; Ord. 2015-555. Adopted 12-14-15.)