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• batteries are replaced. The instructions for calibration procedures are provided with the meter. B. Specific Conductance (SPCO) Meter. SPCO is also taken at each discharge site with the portable meter. Operating instructions and calibration procedures are provided with the meter. The meter is also calibrated monthly, normally during the first week of the month or when repairs to the meter are made or when the batteries are replaced. C. Thermometer. Whenever water samples are taken the temperature is recorded. The pH/SPCO meter is also used to record the temperature. IV. Sampling Schedule The monitoring schedule for the NPDES sites are presented by Table 4.8-12 with sample loca- tions shown on Map M52. The monitoring frequency is specified by NPDES permit CO-0032115. In order not to bias sampling dates, Trapper normally conducts suAace water sampling on Tuesday of each week. This practice was initiated in and has been followed since 1980. Typically not all sample sites are active (discharging) during the scheduled sampling day. Inactive sites may not be visited each week, but are visited at least monthly. Normally, the parameters requiring a monthly frequency are taken on the first Tuesday of each month. This allows time for resampling or to get a monthly sample if the sites are not discharging during the first week. Also, the parameters required on a quartedy frequency are collected during the first month of each quarter. The semi-annual samples are taken in the second and third quarters of the year if possible. • Most of the drainages at Trapper discharge only under spring runoff conditions or under major precipitation events. When the discharge does occur, the complete suite of parameters (list A-3 of Table 4.8-12) is taken to insure NPDES and CDMG sampling requirements are met. Sample schedules are monitored to insure necessary samples are obtained and sample frequencies are met. If the major precipitation events (snowmett, thunderstorms, etc) cause heavy runoff, all discharging sites may be sampled, regardless of the scheduled frequency. Regardless of the precipitation factor, the following parameters or conditions shall be monitored weekly: 1) flow 2) In-situ pH 3) In-situ SPCO 4) Oil and Grease. If no sheen is present, then no sample is required. If a sheen is present, then a grab sample must be taken. 5) In-situ temperature The NPDES 011 (East Pyeatt) drainage is an exception to the scheduled sample frequency. This sde is influenced by a spring that discharges below the last sediment control structure but above the NPDES sample point (i.e. Parshall Flume). In this drainage, only weekly parameters are recorded -unless there is a discharge occurring from the last sediment control structure. When pond discharge occurs, flow is recortled from the Parshall Flume. Other parameters are sampled directly from the discharge of the sediment control structure above the spring. This is done so that the spring does not bias sample results. . Appendix O, Section XXXI, Part B discusses spring and seep monttoring and analysis. LNM VD7 rDA1G1TR78NPP-0]9r ~IAY 1 3 1998