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COLORADO DEPARTMEM OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Rationale -Page 7, Permit No. CO-tXx10221 <br />• Table V-7 -Self-Monitoring RcsuUs for OutfaB 009 <br /> Repotud Previous No. of <br /> Corscersbutions Permit Ilrttitalian <br />Parameter Avg/Min/Max limitation Excursions <br />Flow, MGD <br />30day avg 0.0618/0.0063/0.1173 none - <br />daily maz 0.0835/0.0157/0.1512 none - <br />TSS, mg/f <br />30dav avg 13/<5/26 35 0 <br />dailti• maz 13/<5/26 70 0 <br />Toro! Iron, mg/f <br />30dar avg 0.28/0.03/0.52 3.0 0 <br />daily maz 0.28/0.03/0.52 6.0 0 <br />Settleable Solids, mf/f <0.4/<0.4/<0.4 0.5 0 <br />Oil & Grease, mg/f none visible 70 0 <br />pH, s.u. -/8.01/8.87 6.5-9.0 0 <br />Total Dissolved Solids, mg/f <br />30day avg 450/410/490 none - <br />daily maz 490/490/490 none ' <br />2. State Samoline: There are no recent slate sampling results available for this facility. <br />. B. Compliance With Terms and Conditions of Previous Permit <br />E(Ruent Limirarions: The data shown in the preceding tables indicate apparent violations of the permit. <br />aJ One TSS exceedence from outfall 003 was the result of surface runoff Samples before and after this sample <br />were well below the effluent limitations. <br />b/ One failure of the chronic WET test for both the Ceriodaohnia and the Pimeahales species for outfall 004 arul <br />one failure of the chronic R'ET rest jot the Ceriodaohnia sp. only jot ourfall O08 occurred. Subsequent testing <br />did not indicate failures. <br />cj One failure of the acute WET test for the Ceriodaohnia sp. for autfall 005 occurred. Accelerated testing did not <br />indicate c pattern of roricin~. <br />2. Other Pern~ir Reauirernenrs: The permirtee has been in apparent compliance with all other terms and conditions of <br />the permit. <br />V/. TERMS AND COND/T1ONS OF PERM/T <br />~1. Determination of Effluent Limitations <br />1. Ef/Iuent Limirarions: In deti~e[oping suitable effluent limitations, the Division must reviex~ all applicable standards <br />and regulations and apply those x~hich are more stringent. This review includes, but is not limited to: the water <br />qualir)• standard based effluent limitations, federal guidelines and standards (40 CFR Subchapter N) and State <br />Effluent Regulations (70.1.0). Such a review has been done Jor this facility. The following limitations will apple. <br />The basis for these limitations is discussed in Section VI.A.2 and VI.A.3. <br />