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Seeding of disturbed areas will be done as areas are finished with preparation including grading
<br />and topsoil spreading. Planting will be most successful if done between mid - November and the
<br />end of April. Planting can be performed in May if necessary, but after May it is not advisable to
<br />plant. Planting before November is not advised as the potential for a warm growth environment
<br />and early germination would likely result in a major failure of the revegetation and require
<br />reseeding.
<br />Fertilizer may be applied to re- soiled areas in a manner that will encourage emergence and
<br />survival of the grasses without encouraging competition from weeds. Starter fertilizer could be
<br />applied before, or at the time of, seeding. If necessary, full fertilization will be applied after
<br />emergence. Fertilizer mixtures will be based upon soil tests made on samples taken from re-
<br />soiled areas prior to seeding.
<br />If a significant invasion of noxious weeds occurs after seeding, the weeds will be mowed before
<br />they can go to seed. The areas will be mowed periodically for additional control as needed.
<br />Mechanical control will be used as a first priority. Chemical methods will only be used if no
<br />other alternative produces acceptable results.
<br />Periodic inspection for noxious weeds, at least once a year early in the season, will be done. The
<br />weed inspection will search for not only the expected species but also any new List A or B
<br />species introductions. It is likely that non - noxious and List C species will also be found. Non -
<br />noxious weeds, which are often native invaders, do not need to be controlled, but if the
<br />population of a List C species is controllable then it will be included in the control program.
<br />List C noxious species are problematic but are usually not as serious as List B species. List B
<br />species in Colorado and utilized for Weld County weed management include: Absinth
<br />wormwood, Black henbane, Bouncingbet, Bull thistle, Canada thistle, Chinese clematis,
<br />Common tansy, Common teasel, Corn chamomile, Cutleaf teasel, Dalmatian toadflax, Dame's
<br />rocket, Diffuse knapweed, Eurasian watermilfoil, Hoary cress, Houndstongue, Jointed goatgrass,
<br />Leafy spurge, Mayweed chamomile, Moth mullein, Musk thistle, Oxeye daisy, Perennial
<br />pepperweed, Plumeless thistle, Quackgrass, Russian knapweed, Russian - olive, Salt cedar,
<br />Scentless chamomile, Scotch thistle, Spotted knapweed, Spurred anoda, Sulfur cinquefoil,
<br />Venice mallow, Wild caraway, Yellow nutsedge, and Yellow toadflax.
<br />All List A species must be eradicated by law. These weeds include African rue, Bohemian
<br />knotweed, Camelthorn, Common crupina, Cypress spurge, Dyer's woad, Elongated mustard,
<br />Giant knotweed, Giant salvinia, Hydrilla, Japanese knotweed, meadow knapweed, Mediterranean
<br />sage, Medusahead, Myrtle spurge, Orange hawkweed, Purple loosestrife, Rush skeletonweed,
<br />Squarrose knapweed, Tansy ragwort, and Yellow starthistle. The current complete list of
<br />noxious weed species and local management plans is available from the Weld County Weed
<br />Division.
<br />During mining and reclamation activities for the proposed amendment area, slurry wall
<br />installation will disturb upland areas and potential reservoir slope regrading may disturb existing
<br />lake shorelines. With reservoir water level fluctuations and routine slope maintenance,
<br />revegetation of the reservoir shorelines with a moisture dependent grass seed mix is not practical.
<br />The recommended reclamation seed mixture for reservoir slopes following slurry wall
<br />installation is comprised mainly of the upland grasses. Additionally, upland grasses will be used
<br />Greeley 25"' Avenue Site
<br />DRMS 112 Permit Amendment Application Page 13
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