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replaced or as needed. The instructions for calibration procedures are provided with the <br />meter. <br />C. Specific Conductance (SPCO) Meter. SPCO is also taken at each discharge site with a <br />portable meter. The meter is usually calibrated monthly or when repairs to the meter are <br />made or when the batteries are replaced or as needed. The instructions for calibration <br />procedures are provided with the meter. <br />D. Thermometer. Whenever water samples are taken the temperature is recorded. The <br />combination pH /SPCO meter is also used to record the temperature. Calibrations are <br />done as needed. <br />IV. Sampling Schedule <br />The monitoring schedules for the NPDES sites are presented by Table 4.8 -12 with sample loca- <br />tions shown on Map M52. The monitoring frequency is specified by NPDES permit CO- 0032115. <br />In order not to bias sampling dates, Trapper traditionally conducted surface water sampling on <br />Tuesday of each week. In accordance with the most recent NPDES permit, a monthly monitoring <br />interval has been specified. Sampling will now be conducted during the first full week of each <br />month. <br />Typically not all sample sites are active (discharging) during the scheduled sampling period. Inac- <br />tive sites may not be directly visited the first week of the month or at all due to inaccessibility <br />during inclement weather. Monthly parameters will be taken during the first week of each month. <br />Also, the parameters required on a quarterly frequency are collected during the first month of each <br />quarter. <br />Most of the drainages at Trapper discharge only under spring runoff conditions or under major <br />precipitation events. When discharges do occur during the sampling period, the complete suite of <br />parameters (list A -3 of Table 4.8 -12) is taken to insure NPDES and CDRMS sampling <br />requirements are met. Sample schedules are monitored to insure necessary samples are <br />obtained and sample frequencies are met. <br />The following parameters or conditions shall be monitored monthly during monthly sampling: <br />1) Flow <br />2) In -situ pH <br />3) In -situ SPCO <br />4) Oil and Grease. If no sheen is present, then no sample is required. If a sheen is present, then <br />a grab sample must be taken. <br />5) In -situ temperature <br />Appendix Q, Section XXXI, Part B discusses spring and seep monitoring and analysis. <br />GCR 11/12 <br />Pemut Revisions \TR- 110\APP -Q31] <br />T? �kC <br />Sc"V\' Zk: v <br />