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O ~f I Page 46 of 17 Permit No.: CO-0027154 A. TERMS AND CONDITIONS (continued) 10. Monitoring Requirements Discharge Point 605 In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Pa~I.A.l., the permi[[ee shall monitor all effluent parameters at the following required frequencies: a. Effective during periods of no precipitation or precipitation less than or equal to the 10-year-24 hour event Effluent Parameter Measurement Frequency c/ Sample T}•pe e/ Flow (MGD) Weekly Total Suspended Solids 1/ !lonthly (mg/1) Settleable Solids (ml/1)1/i/ Weekly Total Iron (mg/1) 2 X 4lonthly Hexavalent Chromium (mg/1) 2 X Monthly Total Copper (mg/1) 2 X Monthly Total Silver (mg/1) 2 X P(onthly Total Mercury (mg/1) 2 X Monthly Total Zink (mgll) 2 X Plon[hly Oil and Grease (mg/1) Weekly pH (s.u.) I•leekly Salinity g/ Qu arterly f/ h/ Instantaneous or Continuous Grab Grab Grab Grab Grab Grab Grab Grab l'isual or Grab Grab Grab Self Monitoring samples taken in compliance with the monitoring requirements specified above shall be taken at the following locations: 005, the outfall of sedimentation Pond D as shown in Figure 1 on Page 17a of the permit. 1/ Either TSS or settleable solids will require monitoring. It is the permittee's option on which monitoring to perform. During dry weather conditions TSS must be monitored. b. Effective during periods of precipitation in excess of the 10-year, 24-hour event. Effluent Parameter Measurement Frequency Sample Type e/ Flow (}tGD) Weekly Instantaneous or Continuous Total Suspended Solids 1/ (mg/1) Pionthly Crab Settleable Solids (ml/1) 1/i/ Weekly Crab Total Iron (mg/1) 2 x Monthly Grab Hexavalent Chromium (mg/1) 2 x Monthly Grab Total Copper (mg/1) 2 x Monthly Crab Modified /l' ~ ~3 (added)