(a) Each user so directed by the City shall provide and operate, at the user's own expense, a monitoring facility to allow inspection, sampling and flow measurement of each sewer discharge to the City. Each monitoring facility shall be situated on the user's premises. Except where such a location would be impractical or cause undue hardship on the user, the City may concur with the facility being constructed in the public street or sidewalk area, provided that the facility is located so it will not be obstructed by landscaping or parked vehicles. There shall be ample room in or near such sampling facility to allow accurate sampling and preparation of samples for analysis. The facility, sampling and measuring 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 applicable local construction standards and specifications. Construction shall be completed within 120 days of receipt of written notice from the City directing the user to construct the facilities.
All sanitary sewers requiring monitoring shall have an inspection and sampling manhole or structure with an opening of not less than twenty-four inches in diameter and an internal diameter of not less than forty-eight inches, containing such flow measuring, recording and sampling equipment as may be required by the City to ensure compliance with this chapter.
(b) Users regulated by Categorical Standards shall take samples immediately downstream from pretreatment facilities or immediately downstream from the regulated process if no pretreatment exists. The necessary flows and concentrations shall be measured to allow the use of the combined waste stream formula of 40 CFR 403.6(e) where other wastewaters are mixed with the regulated wastewater prior to pretreatment. Users not regulated by Categorical Standards shall take samples in their final discharge.
(c) Composite sampling techniques shall be used where feasible, but a grab sample shall be acceptable where composite sampling is not feasible.
(d) Users shall employ sampling and analytical procedures that are acceptable to the Water Pollution Control Board for the pollutants in question.
(e) If sampling performed by an industrial user indicates a violation, the user shall notify the Wastewater Pollution Control Plant within twenty-four hours of becoming aware of the violation. The user shall also repeat the sampling and analysis and submit the results of such repeat sampling and analysis to the City within thirty days after becoming aware of the violation, except that the industrial user is not required to resample if:
(1) The City performs sampling at the facilities of the industrial user at a frequency of at least once per month; or
(2) The City performs sampling at the facilities of the user between the time when the user performs its initial sampling and the time when the user receives the results of this sampling.
The reports required in Section 932.12(c) and (d) shall be based upon data obtained through appropriate sampling and analysis performed during the period covered by the report, which data are representative of conditions occurring during the reporting period. The City shall require that frequency of monitoring necessary to assess and assure compliance by industrial users with applicable Pretreatment Standards and requirements.
If an industrial user subject to the reporting requirements in Section 932.12(c) and (d) monitors any pollutant more frequently than required by the City, using the procedures according to 40 CFR, Part 136, or those acceptable to the Board, the results of this monitoring shall be included in the report.
(Ord. 93-293. Passed 12-20-93.)