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COLORADO DEPARTMEM' OF HEALTH, Water Quality Control Division Rationale -Page 22, Permit 1/0. CO11034142 Table VI-8 - Motdtoring Requlrrments (OtgfaU 023) ammeter:..'..'.'. ' ...:::.:..:::::.:...::.: ,....: ..-.:::::r:•:::: caar~rei»enl.A~!e4titt~tY.:; :. ,,,SNtiPk.:~Pt..:.:'::.:::,.,'.;:'::`:..:: Flow, MGD Weekly Instantaneous or Continuous BOD„ mg/1! I/month Grab - TSS, mg/1 t 1 /month Grab TRC, mg/1 !/week Grab Oil and Grease, mgR 1/wrek Visual pH, s. u. 1 /week Grab - TDS, mg/l 1/quarter Grab Fecal Colijotm, q/100 ml //month Grab ' In addition to rmnttoring the final discharge, influent samples shall be taken and analyzed jot this parameter at the same frequency as required jot this parameter in the discharge. • If a visible sheen is noted, a grab sample shall be collected and analyzed for oil and grease. The results are to be reported on the DMR under paramttn 00556. Table VI-9 - Monitoring F'egttirrments (Ou{/aUs 004, 007, 009, Oll, 012, 013, 014, OIS, 016, 017, 018, 019, 020, and 021) Paranieter........'. .'.:;..'.'.,'::::,::::Meruw~ttunlPretlriencs....;:..SamalrlYDe:•::.:-..:. .:.. Flow, MGD 1/month Continuous Oil and Grease, mg/P 1/week Visual+ pH, s. u. 1 /week Grab TDS, mg/P 1 /quarter Grab Senleable Solids, ml/1 1/month Grab If a visible sheen is noted, a grab sample shall be collected and analyzed jot oil and grease. The results are to be reported on the DMR under parameter 00556. Monitoring requirements have not changed from the previous permit with the exception of total recoverable iron and total recoverable zinc at Outfalis 003, 022, and 024. /nstead ojmonitoring jar total recoverable iron and total recoverable zinc as done in the previous pmnit, the proposed permit is requiring the perminee to monitor jar potentially dissolved iron and potentially dissolved zinc. 77u water quality-based ejjluem limitations for these parameters were based upon the potentially dissolved method of analysis. Monitoring frequencies jot zinc remain the same from the previous permit. Monitoring frequencies for iron have been increased to a frequency of once/week due to the uncertainty in the permittee's ability to comply with the potemially dissolved iron limitations. The previous permit limited total recoverable iron and a comparison could not be conducted to determine if the reported concentrations of total recoverable iron in the discharges would exceed the water quality-based effluent limitation jot potentially dissolved iron.