Surface Water Trigger Levels Sample Clauses

Surface Water Trigger Levels. In May 2000, the GNA established three Tiered Trigger levels in surface water as part of its comprehensive surface water, groundwater and aquatic resources protection program. This surface water TTLF includes numeric standards with required responses when exceeded for total phosphorus, total inorganic nitrogen; and total recoverable arsenic, cadmium, chromium, copper, iron, lead, manganese, nickel and zinc. Surface water trigger levels have been updated for the GNA AMP as described herein and shown in Table 6-2. This update includes relocation of the downstream compliance monitoring location to site EBR-005. Site EBR-005 is located in the East Boulder River just downstream of where water quality investigations, including synoptic sampling, have predicted all mine-influenced groundwater is discharged to the East Boulder River (Hydrometrics March 2017). Water chemistry data at this location has shown mine related water quality change in recent years. Another modification to the original surface water TTLF included in this AMP are updated Tier 3 Trigger level values to current Montana Numeric Water Quality Standards defined in Circular DEQ-7 (Montana DEQ, June 2019), and in the case of nutrients (TIN and TP) to levels in the Scientific and Technical Basis of the Numeric Nutrient Criteria for Montana’s Wadeable Streams and Rivers defined for the Level IV Non-calcareous Foothill Grassland eco-region (Montana DEQ, May 2013). The Tier 1 concentration change values were not modified from the values established by the EBOC in the TTLF adopted in May 2003. Tier 2 concentration change values were recalculated as the 50% difference between the original Tier 1 Trigger values and updated Tier 3 Trigger values. Tier 2 concentration change allowances increased for all parameters except arsenic and lead. Surface water Tier 1 and Tier 2 Trigger levels are measured as a concentration change between monitoring stations in the East Boulder River located upstream and downstream of mine operations and known water quality discharges. The upstream monitoring station is defined as EBR-003, and the downstream monitoring station is EBR-005. Surface water trigger values for Tier 3 are measured as an in-stream concentration only at the downstream monitoring station in the East Boulder River from July through September; and as a concentration change from upstream and downstream monitoring stations from October through May. Table 6-2. GNA East Boulder Mine AMP Surface Water TTLF. Surface...
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