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• 6.3.5 Water Discharge/Erosion Control <br />The WRN nahcolite solution mine has been designed as a zero discharge facility in regard to <br />wastewater. Containment structures are designed and constructed to contain the runoff <br />expected from a 25-year precipitation event. Disturbed areas associated with access roads, the <br />well field and plant site are reclaimed as soon as practical following disturbance. Semi- annual <br />WRN inspections/clean-uptyere preformed and annual report submitted to CDPHE WQCD. <br />6.3.6 Historic and Scientific Values <br />Per the BLM, Record of Decision, WRN is required to avoid sites identified for potential <br />listing on the National Register of Historic Places (NRHP). No NRHP sites have been <br />identified in current or planned disturbed areas. If during operations, WRN or a contractor <br />• discovers any cultural or fossil remains, the BLM Area Manager will be contacted <br />immediately and a plan to avoid or mitigate will be developed by the BLM and WRN. <br />6.3.7 Fish and Wildlife Mitigation <br />If any threatened or endangered species could be affected, conservation measures developed <br />through the Section 7 consultation process will be required. As a result of hazards associated <br />with evaporation ponds, an eight-foot fence was constructed to exclude deer, elk and cattle. <br />Deer/vehicle collision reports are submitted to the BLM for evaluation of project impact (see <br />Section 6.2.2). Raptor nest sites were encountered during the 1994 - 1999 raptor inventory <br />sampling. BLM officials were notified and mitigation measures were formulated. An annual <br />• 95 <br />