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the fall and winter months. Therefore, weekly, monthly, and quarterly sampling frequencies aze necessary depending on the season. Weekly monitoring is required for certain stations during the snowmelt-runoff months of March through June to provide data for rapidly changing conditions. Monthly or quarterly monitoring is necessary during interim months to characterize seasonal changes in flow and water quality. Data collection frequencies for all monitoring locations are presented in Table 1. Table 1 Data Collection FY~equency gtatioa TD :. ,....... ..::.:..:::.:'::. F.:::...uenc ': P-1 Monthly (July-February} Weekl arch-June POND-1 Monthl UN-1 Monthly (July-February) Weekl arch-June RC-1 Monthl / uarterl RC-2 Monthl / uarter] NOTE: Weekly sampling will take place for at least one full snowmelt season. If the streams are not running on a consistent basis, monitoring frequency will then be reduced to monthly. LWM is visited by site personnel once a week to conduct sampling and inspections pursuant to the current CDPS permit. This requirement includes sampling and/or inspecting Outfalls 001 and 002, the pipeline, and the surface impoundment. With the exception of more frequent weekly sampling during the snowmelt period, additional visits to LWM aze not scheduled. Three new monitoring locations have been identified in this plan as shown in Figures 2 and 3, Logan Wash Surface Water Monitoring Locations. These include UN-1, RC-1, and RC-2. It is anticipated that the unnamed tributary (iJN-1) will only contain flowing water during snowmelt- or rainfall-runoff periods. This station will be checked for flow and sampled at the frequency listed in Tale 1, but no samples will be collected if there is no flow. If station UN-1 is not flowing during a weekly or monthly sampling visit, Roan Creek sampling will be postponed until the next month when UN-1 is flowing, or until the quarterly sampling round. 12