2021-02-01_REPORT - C1982057 - Laserfiche WebLink

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4.0 SURFACE WATER SIN lies within the Dry Creek and Sage Creek Watersheds. The majority of the permit area drains to the west towards Hubberson Gulch (a tributary to Dry Creek) and Dry Creek, which flows north to the Yampa River. The remainder of the permit area drains northeast towards Sage Creek, which flows north-northeast to the Yampa River. The following table includes the list of SIN surface water monitoring points, the watershed they are located in, the frequency of monitoring, and the required parameters list. See Figure 1 for the location of the surface water monitoring points. Surface water monitoring was completed by experienced personnel using accepted monitoring practices. All samples were analyzed by ACZ Laboratories. Site Type Watershed Monitoring Frequency Parameter Flow Water Quality List WSH9 Surface Water Dry Creek June/Sept June/Sept SW Short NPDES17 NPDES Dry Creek M M NPDES NPDES16 NPDES Dry Creek M M NPDES WSH7* Surface Water Dry Creek NR NR NR NPDES6 NPDES Dry Creek M M NPDES WSHF1 Surface Water Dry Creek SA SA SW Long NPDES5 NPDES Dry Creek M M NPDES WSD5 Surface Water Dry Creek SA SA SW Long NPDES15 NPDES Sage Creek M M NPDES NPDES9 NPDES Sage Creek M M NPDES WSSF3 Surface Water Sage Creek SA SA SW Long Note *Monitoring at WSH7 was suspended per TR-69. However, since samples were collected in 2020 the location is retained on the monitoring list and the results have been reported. SA: Semiannual during spring snowmelt and summer baseflow NR: Not Required M: Monthly SW Long: Field conductivity, field pH, field temperature, total recoverable iron, dissolved manganese, total mercury, ammonia, nitrate, nitrite, dissolved selenium, sulfate, sulfide, total dissolved solids, total suspended solids SW Short: Field conductivity, field pH, field temperature, total recoverable iron, dissolved manganese, total suspended solids, total dissolved solids NPDES: See NPDES permit CO-0000221 Page 10 of 17