2015-09-11_PERMIT FILE - M1979059

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Codlson Excavating Co Inc-Brownwood Pit Page 3 of 5 For parameters such as TIN, the analytical methods chosen shall be those that can measure to the potential or final numeric effluent limit, based on the sum of the PQLs for nitrate, nitrite and ammonia. When the analytical method which complies with the above requirements has a PQL greater than the permit limit, and the permittee's analytical result is less than the PQL, the permittee shall report "BDL" on the DMR. Such reports will not be considered as violations of the permit limit, as long as the lowest available PQL is used for the analysis. When the analytical method which complies with the above requirements has a PQL that is equal to or less than the permit limitation, and the permittee's analytical result is less than the PQL, "< X" (where X = the actual PQL achieved by the laboratory) shall be reported on the DMR. For parameters that have a report only limitation, and the permittee's analytical result is less than the PQL, "< X" (where X = the actual PQL achieved by the laboratory) shall be reported on the DMR. In the calculation of average concentrations (i.e. 7- day average, 30 -day average, 2 -year rolling average), any individual analytical result that is less than the PQL shall be considered to be zero for the calculation purposes. When reporting: if all individual analytical results are less than the PQL, the permittee shall report either'BDL" or "<X" (where X = the actual PQL achieved by the laboratory), following the guidance above. If one or more individual results is greater than the PQL, an average shall be calculated and reported. Note that it does not matter if the final calculated average is greater or less than the PQL, it must be reported as a value. Note that when calculating T.I.N. for a single sampling event, any value less than the PQL (for total ammonia, total nitrite, or total nitrate) shall be treated as zero. The T.I.N. concentration for a single sampling event shall then be determined as the sum of the analytical results (zeros if applicable) of same day sampling for total ammonia and total nitrite and total nitrate. From these calculated T.I.N. concentrations, the daily maximum and thirty day average concentrations shall be calculated and must be reported as a value. The present lowest PQLs for specific parameters, as determined by the State Laboratory (November 2008) are provided below. If the analytical method cannot achieve a PQL that is less than or equal to the permit limit, then the method, or a more precise method, must achieve a PQL that is less than or equal to the PQL in the Table H-1 below. A listing of the PQLs for organic parameters that must meet the above requirement can be found in the Division's Practical Quantitation Limitation Guidance Document, July 2008. These limits apply to the total recoverable or the potentially dissolved fraction of metals. Parameter PQLs Parameter PQLs Aluminum 50 µg/I Mercury 0.1 µg11 Ammonia 1 mg/I Mercury (low-level) 0.003 µg/I Arsenic 1 WI Nickel 50 µg/l Barium 5 Pg/I N -Ammonia 50 µg/I Beryllium 1 W, N Nitrate/Nitrite 0.5 mg/I BOD / CBOD 1 mg/I N -Nitrate 50 µg/I Boron 50 Itg/I N -Nitrite 10 µg/I Cadmium 1 [WI Total Nitrogen 0.5 mg/I Calcium 20 µg11 Phenols 100 µg11 Chloride 2 mg/I Phosphorus 10 µg11 Chlorine 0.1 mg/I Radium 226 1 pCi/I Total Residual Chlorine Radium 228 1 pCi/I DPD colorimetric 0.10 mg/I Selenium 1 µg/1 Am erometric titration 0.05 mg/I Silver 0.5 µg/I Chromium 20 I Sodium 0.2 mg/I Chromium, Hexavalent 20 WI Sulfate 5 mg/I Copper 5 WI Sulfide 0.2 mg/I Cyanide (Direct / Distilled) 10 µg/I Total Dissolved Solids 10 mg/I Cyanide, WAD+A47 5 µg/1 Total Suspended Solids 10 mg/I Fluoride 0.1 mg/1 Thallium 1 µg/I Iron 10 µg/I Uranium 1 µg/I Lead 1 µg/t zinc 10 lig1l Magnesium 20 µg11 Nonylphenol D7065 10 Wdi Manganese 2 µg/I Nonylphenol D7485 0.33 µg/I