2019-07-09_REVISION - M2004044 (30)

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Seeding of disturbed areas will be done as areas are finished with preparation including grading and topsoil spreading. Seeding will be most successful if done between mid-November and the end of April. Seeding can be performed in May if necessary, but after May it is not advisable to plant. Seeding before November is not advised as the potential for a warm growth environment and early germination would likely result in a major failure of the revegetation and require reseeding. Fertilizer may be applied to re-soiled areas in a manner that will encourage emergence and survival of the grasses without encouraging competition from weeds. Starter fertilizer can be applied before,or at the time of,seeding. If necessary,full fertilization will be applied after emergence. Fertilizer mixtures will be based upon soil tests made on samples taken from re-soiled areas prior to seeding. If a significant invasion of noxious weeds occurs after seeding,the weeds will be mowed before they can go to seed. The areas will be mowed periodically for additional control as needed. Mechanical control will be used as a first priority. Chemical methods will only be used if no other alternative produces acceptable results. Periodic inspection for noxious weeds, at least once a year early in the season, will be done. The weed inspection will search for not only the expected species but also any new List A or List B species introductions. It is likely that non-noxious and List C species will also be found. Non-noxious weeds, which are often native invaders,do not need to be controlled, but if the population of a List C species is controllable then it will be included in the control program. List C noxious species are problematic but are usually not as serious as List B species. Specific information regarding weeds is included in the Biological Resource Inventory included with Exhibit H. Aggregate Industries utilizes an integrated weed management protocol to manage weeds on their active mining sites this protocol includes: 1. Management Objective Manage noxious weeds and plant pests within the permit area. 2. Weed Species to be Controlled Aggregate Industries-WCR, Inc. (AI)will control those plant species identified by current State statute or regulation as noxious. Plant pests are defined as those biological species that significantly predate the desirable vegetation of the project site. 3. Weed Management Actions • Monitoring The presence of noxious weeds and plant pests will be monitored annually, at which time weed control efforts will be reviewed and specific management measures adjusted as necessary. Management measures will be undertaken where a single or combination of noxious weed species or plant pests comprises or shows a deleterious effect to the live vegetation cover in the mitigation area as determined by observations of a revegetation or weed control specialist. • Control Measures Al will contract with a licensed herbicide applicator/weed management specialist to implement the weed management plan. Noxious weeds or plant pests may be controlled by any combination of cultural, mechanical, biological,or chemical measures. Weed control measures will be developed specifically for the noxious weed species encountered and in consultation with Adams County, local weed control district and/or the Colorado State Department of Agriculture as necessary. Topsoil slated for removal from the site will be treated with a long-term residual pre-emergent or post-emergent herbicide to reduce noxious weeds prior to removal. Al will conduct an aggressive mowing program the first year following revegetation,withholding herbicide use until the following year to avoid Aggregate Industries Tucson South Resource Permit#M-2004-044112 Permit Amendment Page E-6