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COLORADO DEPART4lENT OF PUBL/C HE,ILTH AND ENV/RONMENT. LVuter Quality Coturo! Drvrsiorr <br />Rnhonale Arnenrlrnent No. 1. Page 8, Permit No. CO-000022/ <br />The Division finds Uta[ the pernriuee has demonstrated dint these outjnlls remain consistently in contplinnce wilt <br />• dre pN and oil nrtd grease limiranorts. There is rto renson m expect thnt thry world be our of rnrnpliart; a unless <br />algne m ponds in summer contributes to u nse in pH and it appears that the penninee mnrrnges their ponds to <br />avoid this. There is no benefit from weekly monitoring. Thus, this permit amendment will inchrde a monitoring <br />redrretion to a trtortthly frequency for orrtfalls 002, 004, 005, 006, 003. 009, 010 and 011 jot pH, oil and <br />grease, and flow. The nmended fregttertcies for the existing outfalls are shown in Tnbles VI-6, VI-7 mid V(-3. <br />Table VI-4 -- hlonilonng Requirements for Outfalls 012, 013, Old, 016, and 017 <br />Parameter Measurernertl Frequency Sample Type <br />Flow, h1GD Weekly /nstnntaneous <br />ar Continuous <br />Total Suspended Solids, mg/P Montltly Grab <br />Total Iron, mg/P Monrh[y Grab <br />Settleable Solids, mP/P Monthly Grab <br />Oil and Grease, rng/P iYlonlhly Visual a/ <br />pH, s. u. Weekly In-situ <br />Total Dissolved Solids, rng/P Quarterly Grab <br />Whnl Fflluonr Tnririty Arnty nrmrtarly Rrnh <br />Tabte VI-S- rYfonitoring Requirements <br />Parameter jot Outjall 015 <br />Measurement Frequency <br />Sample Type <br />Flow, MGD Weekty Instarttarreous <br />• or Continuous <br />Total Suspended Solids, mg/P Monthly Grnb <br />Total Iron, mg/P Monthly Grnb <br />Settleable Solids, mP/P Monthly Grnb <br />Oil and Grease, mg/P rVfonthly Visual n/ <br />pH, s. u. <br />Tnlnl !)i ccnlvvd Cnlidc,lpp/P Weekly <br />lhtnrrarly !n-situ <br />(:rnh <br />Table VI-6 -- Monitoring Requirements jot Outfalls 002, 003, OOS, 006, OIO and OII <br />Parameter rbleasurement Frequency Sample Type <br />Flow, MGD /nstantarteous <br />All ou~lalls except 003 Monthly or Continuous <br />Outfall 003 Weekly <br />Total Suspended Solids, mg/P Monthly Grab <br />Total Iron, mg/P Montltly Grab <br />Settleable Solids, mP/P Monthly Grab <br />Otl and Grease, mg/P Visual a/ <br />All out(alls except 003 Montldv <br />Outfall 003 Weekly <br />• pH, s. u. <br />Al( out(alfs except 009 <br />Monthly <br />kl <br />W /n-star <br />Outfa 003 ee <br />y <br />Total Dissolved Solids, mg/P Quanerl}' Grab <br />