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rart I Page No. 9 Permit No.: CO-0043648 (iv) Record the pH to the nearest 0.10 umt and temperature to [he nearest 0.5 degree Celsius The time of collection should be recorded to [he 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) Minimize the number of people collecting and running the samples. The object is to ensure that each is done the same way every time. B. MONITORING REQUIREMENTS 1. Frequency and Samnle Tvpe Monitoring will be required os shown in the following tables. Refer to the permit for locations of monitoring points. In the selection of monitoring frequency for each parameter, several factors were considered, including the frequency of detection and level of the pollutant found in past monitoring, the level of the corresponding e8luent limit, the potential toxicity of the pollutant, and the need for accuracy in the measurement of the parameter. If the results of monitoring performed in compliance with the specified frequencies demonsvate that an alternate frequency would be more appropriate, the permit may be reopened, subject to the provisions of the Reeulations for the State Discharge Permit Svstem, in order to incorporate that frequency. For discharges which flow intermittently, samples must be collected at {east once within the calendar period that is delineated by the monitoring frequency, whenever any discharge occurs within that calendar period. For discharge point 001 A, no special sampling restrictions related to stormwater 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 are collected when direct surface runoff resulting from rainfall is included in the flow being monitored, this must be noted and reported on the mont}dy DMR. Table I.B.-1. 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 Effluent Parameter ~ ~ ~ ~ ~ Measurement Frequency ~ Sample Type Flow, MGD 3 Days/Week Instantaneous TSS, mg/I Weekly Grab Oil and Grease, mg/1 3 Days/Week Visual pH, su (minimum-maximum) 3 DayslWeek 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/l Weekly Grab Copper, Potentially Dissolved, mg/I Once(fvvo Weeks Grab Iron, Total Recoverable, mg/1 Weekly Grab Lead. Potentially Dissolved Mont}dy Grab Manganese, Potentially Diss, mg11 Weekly Grab Mercury, Total, mg/I Mont}dy Grab Nickel, Potentially Dissolved, mg/I Once/fwo Weeks Grab Zinc, Potentially Dissolved, mg/I Weekly Grab