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Seneca II W <br />AHR 2017 <br />Page 4 <br /> <br /> <br /> <br /> <br /> <br /> <br />Requirement Requirement citation Comment <br /> A high level mercury test with a method detection <br />limit of 0.2 ug/l for streams was run. All high level <br />test values this year were less than the detection limit. <br />The mercury standard (0.2 ug/l) was exceeded 11 <br />times at nine sites. <br /> <br />The Sulfide standard (0.02 mg/l) <br />was exceeded once at one site. <br />10. Interim Narrative <br />Standard for Ground Water <br />CWQCC regulation 41 As per permit section Appendix 3b, and TR63 it was <br />determined that bedrock groundwater points of <br />compliance are unwarranted at the Seneca IIW Mine. <br /> <br />Well WHAL72 monitors Hubberson Gulch alluvium <br />downstream of NPDES outfalls, 06, 16 and 17. <br /> <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 were below the Reg. <br />41 standards during the 2017 water year with the <br />exception of one exceedance of the ambient iron <br />standard of 8.06 mg/l with a value of 9.53 mg/l. Well <br />DCAL02 did not exceed the TDS, standard of 3165 <br />mg/l. <br /> <br />The Agricultural ground water standard (750 mg/l) for <br />boron was exceeded (900 MG/L) at one site one time <br />(WW14). <br /> <br />The pH standard was exceeded three times at three sites <br />(WW14, WWC25, WWCU25). The iron standard (5 <br />mg/l), was exceeded three times at three sites (DCAL02, <br />WHAL7-2, WW14). <br /> <br />The manganese standard (0.2 mg/l) was exceeded at four <br />sites (DCAL02, WHAL7-2, WOV14, WW14). Based <br />on CWCC Reg. 41, the standard of 0.2 mg/l, applies to <br />plants grow in acidic soils (<6.0 pH). In alkaline soils, <br />as found throughout the Yoast and Seneca IIW region, <br />the EPA standard would be 10 mg/l. The maximum <br />manganese value observed at any well site was 1.4 mg/l. <br />11. Sampling frequency at <br />surface water <br />Tab 15, Table 1 of <br />CDRMS mining permit <br />C1982057 <br />The report indicates that all frequencies were met. <br />12. Parameters to be <br />sampled at surface water <br />sites <br />Tab 15, Table 2 <br /> CDRMS mining <br />permit C1982057 <br />Parameters to be sampled are conductivity <br />(umhos/cm), pH (units), temperature (C), total <br />recoverable iron (mg/l), dissolved manganese (mg/l), <br />total mercury (ug/l), dissolved nitrate (mg/l), dissolved <br />nitrite (mg/l), total ammonia (mg/l), dissolved selenium <br />(ug/l), dissolved sulfate (mg/l), total sulfide (mg/l), total <br />suspended solids (mg/l) and total dissolved solids <br />(mg/l). All required parameters were analyzed. All <br />parameters were met.