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Ms.Amy Eschberger
<br /> RE: Treiber Lakes M-2011-049
<br /> December 1, 2021
<br /> reservoir embankment slopes around the pumping discharge point shall be regraded and a riprap
<br /> inlet rundown shall be constructed to stabilize the area. Additional pumping into Treiber A shall
<br /> not occur until the inlet rundown is constructed. Future pumping discharges into the Treiber A
<br /> reservoir shall use the stabilized inlet rundown to minimize additional erosion to the reservoir
<br /> embankment. Design plans for the inlet rundown structure are included in Attachment E.
<br /> Additionally, when the Treiber A reservoir water level is lowered in spring of 2022, embankment
<br /> slopes around the reservoir shall be regraded where other erosion gullies and rills have developed.
<br /> Reve eta Problem #3 from the inspection report was addressed in our initial response dated
<br /> August 2, 2021, by providing photographs and other proof that the approved weed control plan
<br /> had been implemented at the Treiber Lakes site. The response also indicated that the weed control
<br /> plan would be reviewed_and updated, if necessary._Upon review,the Larimer County List A.and
<br /> List B noxious weed species were updated. Additionally, although the control measures provided
<br /> in the weed management plan appear to be sufficient,it was determined that more care and urgency
<br /> is required while implementing the plan.
<br /> UPDATED WEED MANAGEMENT PLAN
<br /> To control noxious weeds on the Treiber Lakes site during reclamation,the weeds shall be mowed
<br /> before they can go to seed. The areas shall be mowed at least once a year in the spring, but also
<br /> periodically for additional control as needed. Mechanical control shall be used as a first priority.
<br /> On steep slopes or near the water where riding mowers are hazardous, hand-held trimmers may be
<br /> used to mow select areas. Chemical methods shall only be used if no other alternative produces
<br /> acceptable results.
<br /> Periodic inspection for noxious weeds, at least once a year early in the season, shall be done. The
<br /> weed inspection shall search for not only the expected species but also any new List A or B species
<br /> introductions. It is likely that non-noxious and List C species will also be found. Non-noxious
<br /> weeds, which are often native invaders, do not need to be controlled, but if the population of a
<br /> List C species is controllable then it will be included in the control program.List C noxious species
<br /> are problematic but are usually not as serious as List B species.
<br /> List B species in Larimer County include: Canada thistle,Musk thistle,Bull thistle, Scotch thistle,
<br /> Dalmatian toadflax, Yellow toadflax, Diffuse knapweed, Spotted knapweed, Russian knapweed,
<br /> Leafy spurge, Houndstongue, Common teasel, Tamarisk, Hoary alyssum, Hoary cress, Absinth
<br /> wormwood, Black henbane, Bouncingbet, Chamomile, Chinese clematis, Common tansy, Cutleaf
<br /> teasel, Dame's rocket, Eurasian watermilfoil, Jointed goatgrass, Moth mullein, Oxeye daisy,
<br /> Russian-olive, Sulfur cinquefoil, Wild caraway, and Perennial pepperweed.
<br /> All List A species must be eradicated by law. These weeds include Yellow starthistle,
<br /> Mediterranean sage, Myrtle spurge, Cypress spurge, Orange hawkweed, Hairy willow-herb,
<br /> Purple loosestrife, and Knotweed species. The current complete list of noxious weed species is
<br /> available from the Larimer County Weed Management Program.
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