A. Analytical Requirements: All pollutant analyses, including sampling techniques, whether performed by the user, an independent contractor, or the city, shall be performed in accordance with the techniques prescribed in 40 CFR part 136 and amendments thereto, unless otherwise specified in an applicable categorical pretreatment standard. Where 40 CFR part 136 does not include a sampling or analytical technique for the pollutant in question, sampling and analyses shall be performed in accordance with sampling and analytical procedures approved by the administrator of the U.S. EPA.
B. Sample Collection:
1. Except as indicated in subsection B2 of this section, the user shall collect wastewater samples using flow proportional composite collection techniques. The city may authorize the use of time proportional sampling or the appropriate minimum number of grab samples where the user demonstrates that this will provide a representative sample of the effluent being discharged. In addition, grab samples may be required to show compliance with instantaneous discharge limits.
2. Unless otherwise prescribed by the city, samples for oil and grease, temperature, pH, cyanide, phenols, sulfides, and volatile organic compounds must be obtained using grab collection techniques. Multiple grab samples collected during a twenty four (24) hour period may be composited prior to analysis. (Dilution may be a problem in composited.)
3. Samples shall be collected immediately downstream from pretreatment facilities if such exist or immediately downstream from the regulated or manufacturing process if no pretreatment exists or as determined by the city and contained in the user's indirect discharge permit. (Ord. 228, 6-10-2009)