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Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 8 4.0 SITE-SPECIFIC INTEGRATED WEED MANGEMENT PLAN Overall weed management at the Site will be monitored during semi-annual inspections (prior to and after seeding) to evaluate the effectiveness of previous activities conducted and for the strategies being implemented. Changes to control methods and/or implementation schedule will be made, as necessary. Due to the current extent of the pit, access to all the areas of concern for equipment is limited. If weeds are determined to be spreading beyond current containment, ASCI will implement mechanical controls (e.g., mowing) to manage priority targeted weed species present when backfill of the Site allows for safe passage of equipment to access areas of concern identified. This will prevent seed production/spreading of weeds and allow for further cultural establishment of the native plant species and competitive grasses already present at the Site. Mowing will be conducted two (2) times per year during the operational life of the mine once feasible to implement.The first mowing will occur in the spring to early summer as the plants bolt, but before the plants flower(roughly April through early June). The second mowing will occur in the fall as the plants prepare for winter dormancy(late September or early October). Due to the adjacent South Platte River on the western boundary,the application of spray herbicides poses a significant risk to these sensitive receptors (Figure 1). Factors outside the control of a licensed commercial spraying applicator(e.g.,sustained wind speeds or gusts greater than 10 miles per hour [mph] during application causing drift, herbicide runoff, etc.) could result in the contamination of waters and/or other private property. To avoid possible adverse impacts from herbicides, ASCI will begin to implement chemical/herbicide controls the season prior to reclamation seeding. Chemical/herbicide controls implemented will consist of full application and/or spot treatment of weeds, as appropriate. The actual chemical(s)/herbicide(s) used will be selected by the licensed commercial spraying applicator; however, herbicides that can be applied to range and pasturelands are provided on the fact sheets presented in Appendix A and general chemical/herbicide selection sheets are presented in Appendix B. Per Weld County Public Works Department-Weed Management Division recommendation, a Piper E-Z combination(Liquid: 20 oz./acre; Granular: 10 oz./acre)is recommended for soft bare ground and to keep existing grasses. 5.0 BASIC WEED MANAGEMENT GUIDELINES Noxious weed management is not a one-time effort. To obtain your desired level of management, you will need to perform control measures for several years. Work will include observation, control application, observation of controls effectiveness and eradication of the weed population. Work at small infestations and the perimeters of larger infestations first. This will help keep infestations from spreading outward and will help to control new outbreaks. By confining the weeds into areas, they will be more manageable. Keep records of the controls you use and the results.This will provide analysis of the weed control progress and make any needed modifications to the specific weed control program.