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PART <br />Page 8 of 19 <br />Permit No.: CO -048233 <br />Parameter <br />Practical <br />Quantitation <br />Limits, <br />Parameter <br />Practical <br />Quantitation <br />Limits, ItgA <br />Aluminum <br />50 pgtI <br />Manganese <br />2 <br />Ammonia <br />I mg/1 <br />Mercury <br />0.1 µ l <br />Arsenic <br />1 <br />Mercury low-level <br />0.003 <br />Barium <br />5 1 <br />Nickel <br />50 µ <br />Beryllium <br />1 1 <br />N -Ammonia <br />50 1 <br />BOD / CBOD <br />I mgfl <br />N Nitrate/Nitrite <br />0.5 m <br />Boron <br />50 jigtl <br />N -Nitrate <br />50 <br />Cadmium <br />1 l <br />N -Nitrite <br />10 VgtI <br />Calcium <br />20 <br />Total Nitrogen <br />0.5 m <br />Chloride <br />2 mg/1 <br />Phenols <br />100 <br />Chlorine <br />0.1 m <br />Phosphorus <br />10 1 <br />Total Residual Chlorine <br />Radium 226 <br />1 Ci/I <br />DPD colorimetric <br />0.10 mg/1 <br />Radium 228 <br />1 Ci/1 <br />Am erometric titration <br />0.05 m <br />Selenium <br />1 <br />Chromium <br />20 1 <br />Silver <br />0.5 VgA <br />Chromium, Hexavalent <br />20 <br />Sodium <br />0.2 m I <br />Copper <br />5 p <br />Sulfate <br />5 mgtl <br />Cyanide Direct / Distilled <br />10 <br />Sulfide <br />0.2 m <br />Cyanide, WAD+A47 <br />5 ggfl <br />Total Dissolved Solids <br />10 m <br />Fluoride <br />0.1 m <br />Total Suspended Solids <br />10 m <br />Iron <br />10 <br />Thallium - <br />1. Rgtl <br />Lead <br />1 <br />Uranium <br />1 <br />Magnesium <br />20 <br />Zinc- <br />10 µ 1 <br />These limits. apply to the total recoverable -or the potentially dissolved fraction of metals. <br />For hexavalent chromium, samples must be unacidifiedso dissolved concentrations will be measured rather than potentially <br />dissolved concentrations. The procedure for determining settleable solids is contained in 40 CFR 434.64. Thepractical <br />quantitation limit for measuring settleable solids under this part shall be 0.4 mUl. <br />In the calculation of average concentrations, those analytical results that are less than thepractical quantitation limit shall be <br />considered to be zero for calculation purposes. If all individual analytical results that would be used in the calculations are <br />below the practical quantitation limit, then "less than x ", where x is the practical quantitation limit, shall be reported on the <br />monthly DMR. Otherwise, report the calculated value. <br />4. Records <br />The permittee shall establish and maintain records. Those records shall include the following: <br />a. The date, type, exact location, and time of sampling or measurements; <br />b. The individual(s) who performed the sampling or measurements; <br />c. The date(s) the analyses were performed; <br />d. The individual(s) who performed the analyses; <br />e. The analytical techniques or methods used; <br />f. The results of such analyses;. and <br />g. Any other observations which may result in an impact on the quality or quantity of the dicharge as indicated in 40 CFR <br />122.44 (i)(1)(iii). <br />The permittee shall retain for a minimum of three (3) years records of all monitoring information, including all original stip <br />chart recordings for continuous monitoring instrumentation, all calibrationand maintenance records, copies of all reports <br />required by this permit and records of all data used to complete the application for this permit. This period of retention kall <br />be extended during the course of any unresolved litigation regarding the discharge of pollutants by the permittee or when <br />requested by the Division or EPA. <br />• <br />