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rart I Page No. 9 Permit No.: CO-0043648 (iv) Record the pH [o the nearest 0.10 unit and temperature to the nearest 0.5 degree Celsius. The lime of collection should be recorded to the nearest five minutes. (v) Record weather conditions for each sample (e. g., warm-sunny; cloudy and cold; raining; etc.). Record stream flow conditions (e. g., low and clear; iced over, high and turbid; etc.). ' (vi) Minitnize the number of people collecting and running the samples. The object is [o ensure that each is done the same way every time. B. MONITORING REQUIREMENTS 1. Frequency and Sample Tv rye Monitoring will be required as shown in the following tables. Refer to the permit for locations of monitoring points. !n the selection of monitoring Gequency for each parameter, several factors were considered, including the Gequency of detection and level of the pollutant found in past monitoring, the level of the corresponding effluent limit, the potential toxicity of the pollutant, and the need for accuracy m the measurement of the parameter. If the results of monitoring performed in compliance with the specified frequencies demonsVate that an alternate Gequency would be more appropriate, the permit may be reopened, subject to the provisions of the ReQtrlations for the State Discharge Permit Svslem, in order to incorporate that frequency. For discharges which flow intermittently, samples must be collected at least once within the calendar period that is delineated by the monitoring frequency, whenever any discharge occurs wuhin that calendar period. For discharge point 001 A, no special sampling restrictions related [o stonnwa[er apply. However, the data that is collected must provide an accurate representation of the quantity and quality of the water flowing past the point. If samples aze collected when direct surface runoff resulting from rainfall is included in the flow being monitored, this must be noted and reported on the monthly DMR. Table I.B.-I. Monitoring for Points: OOIA -Discharge From the Sediment Pond Located Below the Valley Leach Facility to Arequa Gulch OOSB -Precipitation induced Discharge From the Valley Leach Facility to Arequa Gulch Eflluenf Parameter Measurement Frequency Sample Type Flow, MGD 3 Days/Week Instantaneous TSS, mg/I Weekly Grab Oil and Grease, mg/I 3 Days/Week Visual pH, su (minimum-maximum) 3 Days/Week in-Situ Ammonia, Total, mg/I as N Weekly Grab Cyanide, WAD, mg/I 3 Days/Week Grab Aluminum, Potentially Diss, mg/1 Weekly Grab Cadmium, Potentially Dissolved, mg/I Weekly Grab Copper, Potentially Dissolved, mg/I Once/fwo Weeks Grab Iron, Total Recoverable, mg/I Weekly Grab Lead. Potentially Dissolved Monthly Grab Manganese, Potentially Diss, mg/I Weekly Grab Mercury, Total, mg/I Monody Grab Ntckel, Potentially Dissolved, mg/I Once/iwo Weeks Grab Zinc, Potentially Dissolved, mg/I Weekly Grab