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Seneca IIW AHR 2020 <br /> Requirement Requirement citation Comment <br /> 10. Interim Narrative CWQCC regulation 41 As per permit section Appendix 3b, and TR63 it was <br /> Standard for Ground Water determined that bedrock groundwater points of <br /> compliance are unwarranted at the Seneca IIW Mine. <br /> 14 wells are monitored for groundwater quality. <br /> Well WHAL 7-2 monitors Hubberson Gulch <br /> alluvium downstream of NPDES outfalls, 06, 16 and <br /> 17. <br /> Well DACL02 serves as the Seneca IIW Mine's Dry <br /> Creek Alluvial ground water point of compliance. <br /> Ambient values for site DACL02 met all the Reg.41 <br /> standards during the 2020 water year. <br /> Alkaline pH values were noted at WSSF3. <br /> The manganese agricultural use standard (0.2 mg/1), was <br /> not exceeded. Based on CWCC Reg. 41,the standard of <br /> 0.2 mg/l, applies to plants grown in acidic soils (<6.0 <br /> pH). In alkaline soils, as found throughout the Yoast <br /> and Seneca IIW region,the EPA standard would be 10 <br /> mg/l. The maximum manganese value observed at any <br /> well site was 2.2 mg/l. Pre mining manganese values <br /> often exceeded the standard. <br /> 11. Sampling frequency at Tab 15,Table 1 of The report indicates that all frequencies were met. <br /> surface water CDRMS mining permit <br /> C1982057 <br /> 12. Parameters to be Tab 15,Table 2 Parameters to be sampled are conductivity <br /> sampled at surface water CDRMS mining (umhos/cm), pH (units), temperature (C), total <br /> sites permit C1982057 recoverable iron (mg/1), dissolved manganese (mg/1), <br /> total mercury (ug/1), dissolved nitrate (mg/1), dissolved <br /> nitrite (mg/1),total ammonia (mg/I), dissolved <br /> selenium (ug/1), dissolved sulfate (mg/1),total sulfide <br /> (mg/1),total suspended solids (mg/I) and total <br /> dissolved solids (mg/1). All required parameters were <br /> analyzed. <br /> 4 <br />