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• Soil Pits - SoilISpoil Fertility and Quality <br />No new soil material placement occurred in 2017; therefore, no soil pits were established <br />and no soil/spoil quality samples were collected or analyzed. <br />• Soil Balance <br />No soil salvage occurred in 2017. Therefore, as for the three previous years (2013, 2014, <br />2015, 2016), the current soil material balance reflects an average soil replacement depth of <br />2 feet (24 inches). <br />• Soil Salvage, Storage and Replacement <br />No soil material was replaced in 2017. Stockpile A contains 91.2 acre-feet (147,150 cy) of <br />soil material. <br />oee ivl-1 iopsou Kemoval Map jor. lockpile "A" location. <br />REVEGETATION <br />Seeding and Shrub Planting <br />Table 12.2, PSCM Upland Area Seed Mix, and Table 12.3, PSCM Mesic Site Conditions <br />Seed Mix, reflect the species and seeding rates for the approved revegetation seed mixes. <br />Although no seeding was required in 2014 through 2017, supplemental broadcast seeding <br />was completed in 2014 for recently disturbed ditches, slopes near the portal, and selected <br />areas within the 356.4 acre disturbance boundary to stabilize these areas and increase <br />vegetative cover. No shrubs or trees were planted in 2017. <br />Weed Control <br />Noxious weed surveys were completed to identify areas of weed infestations on the PSCM <br />reclaimed areas in 2017. Targeted weed control spraying was conducted using selective <br />herbicide mixtures to control several identified species, with thistle and hounds -tongue as <br />the primary targeted species, and secondary spraying of any areas of whitetop, mullen, and <br />toadflax. Weed control areas will be monitored in 2018 for effectiveness and any necessary <br />follow-up treatment. <br />See Attachment B — Weed Control Logs, for details on the 2017 herbicide spray <br />applications (actual log is on file at the mine site). Since sprayed areas were relatively <br />small and adequately described in the weed control log, a map will not be provided with the <br />2017 report. Note that the building perimeters (office, shop, etc.), substations, and road <br />perimeters were monitored and sprayed as needed. <br />Revegetation Success Monitoring <br />The CDRMS approved Minor Revision (MR -27) for minor changes to the vegetation <br />success criteria of the solid waste disposal or landfill area. The landfill is an area <br />comprised of approximately 8.0 acres and was approved for Phase I Bond Release as a part <br />of SL -4 (Seneca 11) in June of 2010. PSCM proposed the vegetation success criteria be <br />changed to that of the more recently disturbed areas associated with the underground mine <br />as described in Section 2.05.4 (Reclamation Plan) of the approved mine permit. As a result <br />2016 ARR 4 <br />