A. Required: Each "large commercial-industrial user", "small nonresidential commercial-industrial user" and "tax-exempt user", as defined in Section 8-1-2 of this Chapter, shall submit periodic certified statements to the Sanitary District, as provided herein, no more than twelve (12) times per year, certifying the quantities and concentrations of its sewage, industrial wastes and other wastes discharged into the sewers and sewage works of the Sanitary District, or into any sewer connected therewith. The quantity of flow reported shall be the quantity for each reporting period of operation and such reports shall also show that no hazardous or toxic waste is being discharged. A separate, certified statement must be filed for each facility, business establishment or industrial plant. The total quantities and concentrations of sewage, industrial waste and other wastes to be measured and certified by the user shall be:
1. Liquid in gallons (gal).
2. Five (5) day BOD in milligrams per liter (mg/l).
3. Suspended solids in milligrams per liter (mg/l).
Should inspection by the Sanitary District reveal that any statement of quantities or other information filed by a user does not accurately represent actual conditions, the Sanitary District shall adjust the quantities and information according to the Sanitary District's determinations.
B. Standards For Examination: Unless otherwise provided, all measurements, tests, sampling and analysis required hereunder, shall be in accordance with the latest edition of Standard Methods for the Examination of Water and Waste Water, published jointly by the American Public Health Association, the American Waterworks Association and the Water Pollution Control Federation.
1. Sampling Chamber:
a. In order to provide for accurate sampling and measurement of industrial wastes, each commercial-industrial user and tax-exempt user shall provide, on each of its outlet sewers, a large manhole or sampling chamber. The sampling chamber should be located outside or near its plant boundary line where feasible. The sampling chamber shall be available to the Sanitary District to permit access. There shall be ample room in or near each sampling chamber in order to accurately sample for analysis.
b. Such sampling chamber shall be constructed and in proper operation within six (6) months of the effective date hereof.
c. Equipment and facilities of the Sanitary District placed in a sampling chamber for the purpose of determining the quantity and/or strength of the user's sewer discharge or verification of a user's reports with respect thereto shall not be moved, tampered with, adjusted, relocated, removed or otherwise damaged by the user. The City shall have the right to waive strict compliance with the requirement of a sampling chamber, provided adequate provisions are made by user in lieu thereof.
2. Liquid Quantity Measurements: Each sampling chamber wherein flow proportioned sampling is or must be performed pursuant to the requirements of this Chapter shall contain an accurate flow-measuring device, such as a flume or weir. The City shall have the right to waive strict compliance with the requirement of a measuring device, provided adequate provisions are made by user in lieu thereof.
3. Sampling:
a. Minimum requirements for determining representative concentrations shall include reevaluation at least once during each calendar year period. The determination of representative concentrations shall be based on samples that are taken hourly, refrigerated and composited daily to be representative of the sewage, industrial waste or other wastes discharged by a user during normal daily operations. Users who reevaluate their discharge once during the calendar year shall apply the resulting representative concentrations to the entire year. Reevaluations of discharges by a user when made more than once per calendar year shall be reported and employed in a manner which most reasonably characterizes the user's discharge.
b. Commercial-industrial and tax-exempt users whose flow exceeds an annual average of two hundred thousand (200,000) gallons per day (757,000 liters per day) shall sample in proportion to flow for a period of consecutive days constituting one normal work week.
c. Commercial-industrial and tax-exempt users whose flow is two hundred thousand (200,000) gallons per day (757,000 liters per day) or less shall sample for a period of at least two (2) consecutive working days. (Ord. 928, 36-1990)
d. Large commercial-industrial and tax-exempt users with wide fluctuations in the quantity and/or concentrations of wastes shall have an automatic flow measurement device and an automatic sampler, with samples taken in proportion to flow, with analysis provided as required by the Sanitary District to be representative of sewage, industrial wastes or other wastes generated by a user during normal operations. The user or its authorized representative shall certify in writing that samples were taken in accordance with the foregoing requirements. The facilities for, and details of, frequency of sampling, sampling chamber, metering device, sampling methods, and analysis of samples shall be subject, at any time, to inspection and verification by the Sanitary District. Plans for sampling chambers, with their locations shown on site plan, shall be submitted for approval to the Superintendent of Public Works. (Ord. 928, 3-6-1990; amd. 1998 Code)