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Coors Energy Company Keenesburg Mine-Phase III Bond Release Application <br /> Revegetation Success Demonstration <br /> 5.3 Species Composition <br /> Areas 29/23, 30, and 31 each exhibited four perennial grass species with a non-noxious relative <br /> cover of 3%to 40% (Table 9). Thus, all three areas have met the species composition criteria for <br /> Phase III bond release. <br /> Table 9: Non-Noxious Relative Cover(%) of Perennial Grasses in Areas 29/23, 30, and 31 <br /> 2021 2022 <br /> Area Area <br /> Scientific Name Common Name 29/23 30 31 29/23 30 31 <br /> Andropogon hallii sand bluestem 23.6 39.8 24.1 7.7 27.3 7.3 <br /> Bouteloua curtipendula sideoats grama 3.1 <br /> Bouteloua gracilis blue grama 8.0 4.7 3.1 3.1 <br /> Calamovilfa longifolia prairie sandreed 10.9 7.2 39.9 7.9 3.3 <br /> Schizachyrium scoparium little bluestem 3.0 <br /> Sporobolus airoides alkali sacaton 3.1 <br /> Sporobolus cryptandrus sand dropseed 24.8 26.7 20.6 9.1 18.1 8.7 <br /> Total Species >3% and<40% 4 4 4 4 4 4 <br /> Standard Passed? Yes Yes Yes Yes Yes Yes <br /> 6 Summary <br /> Quantitative monitoring of Reclamation Areas 29/23, 30, and 31 revealed that all three areas met <br /> the revegetation success standards for Phase III bond release (Table 10). <br /> Table 10: Success Standard Summary for Areas 29/23, 30, and 31 <br /> 2021 2022 <br /> Area Area Area Area Area Area <br /> Reclamation Standard 29/23 30 31 29/23 30 31 <br /> Vegetation Cover Yes Yes Yes Yes Yes Yes <br /> Herbaceous Production Yes Yes Yes Yes Yes Yes <br /> Species Composition Yes Yes Yes Yes Yes Yes <br /> Eligible for Release Yes Yes Yes Yes Yes Yes <br /> 7 References <br /> Colorado Division of Reclamation, Mining and Safety(DRMS).1995. Guideline Regarding <br /> Selected Coal Mine Bond Release Issues,April 18, 1995. URL: <br /> https://mining.state.co.us/Programs/Coal/RulesRegs/DocumentsBondReleaseGuidelines. <br /> pdf. <br /> Colorado Division of Reclamation, Mining and Safety(DRMS). 2020. Regulations for Coal <br /> Mining 2 CCR 407-2, effective July 1, 2020. URL: <br /> https://drive.google.com/file/d/1DA6xsyeomnlZZDgxoYZrOTTcYS 8O4YAh/view. <br /> USDA,NRCS. 2022. The PLANTS Database.National Plant Data Team, Greensboro,NC. <br /> URL: http://plants.usda.gov, accessed August 2018. <br /> SL-12 11 May 2024 <br />