2015-06-08_REVISION - M1980244

• Permit No: M1980244
• IBM Index Class Name: REVISION
• Doc Date: 6/8/2015
• Doc Name: Request TR75
• From: CC&V
• To: DRMS
• Type & Sequence: TR75
• Email Name: TC1
• Email Name: WHE
• Media Type: D
• Archive: No

by preventing small problems from becoming large problems while expending a minim
of effort.
By evaluating the parameters of population size and density, infestations can be ranked
for priority of treatment. A recommended matrix for prioritization is provided here.
The size of noxious weed infestations will be rated from 1 to 3, and the density of the
infestation (percent cover) will be rated from 1 to 3. Large infestations include infested
areas 1/10 acre or larger with a rating of three. Medium infestations include areas 100
square feet to 1/10 acre with a rating of two. Small infestations include areas smaller than
100 square feet. A light density is defined as an infested area where noxious weeds make
up less than 10% of the total vegetation. Moderate density is defined as 10-50% cover of
noxious weeds, and heavy density is defines as with more than 50% noxious weeds
cover. Size and density evaluations can be made with a quick visual assessment, as the
precise ranking is not as important as the overall strategy for the site.
Table 1. Population Size and Density Prioritization
3.3 Integrated Pest Management (IPM) Methods
Successful weed management begins with an understanding of the target plant species
and the environment within which it grows. An Integrated Pest Management (IPM)
approach will be implemented for the treatment of weeds on the mine property. An IPM
approach enables selection of one or more weed management methods based on the
characteristic of the weed species, site specific environmental conditions, and
management priorities. IPM methods include chemical, mechanical, cultural, and
biological control.
3.3.1 Cultural Control
Germination and establishment of weeds can be significantly reduced by following
accepted revegetation techniques that favor the growth of desirable species. These
include prompt seeding and revegetation of disturbed areas (e.g. topsoil stockpiles,
overburden storage, drainages within mine property, and reclaimed areas) with
appropriate seed mixes, maintaining optimum fertility and moisture levels, seeding
optimum density, and selecting suitable species for revegetation. Minimizing areas of
disturbance and exposed soil prevents opportunities for aggressive species to establish,
and establishing desirable and native species can help to limit establishment of
undesirable weeds.
Cresson Project Weed Management Plan 4
Density of
Infestation
Size of
Population
Density
Plants per
Population
Size
Populations
Rating
Level
area
Ratin
Small
<100 sq. ft.
1
Light
<10%
1
100 sq. ft. to
Medium
1/10 acre
2
Moderate
10%-50%
2
Large
1/10 acre>
3
1 Heavy
50%>
3
3.3 Integrated Pest Management (IPM) Methods
Successful weed management begins with an understanding of the target plant species
and the environment within which it grows. An Integrated Pest Management (IPM)
approach will be implemented for the treatment of weeds on the mine property. An IPM
approach enables selection of one or more weed management methods based on the
characteristic of the weed species, site specific environmental conditions, and
management priorities. IPM methods include chemical, mechanical, cultural, and
biological control.
3.3.1 Cultural Control
Germination and establishment of weeds can be significantly reduced by following
accepted revegetation techniques that favor the growth of desirable species. These
include prompt seeding and revegetation of disturbed areas (e.g. topsoil stockpiles,
overburden storage, drainages within mine property, and reclaimed areas) with
appropriate seed mixes, maintaining optimum fertility and moisture levels, seeding
optimum density, and selecting suitable species for revegetation. Minimizing areas of
disturbance and exposed soil prevents opportunities for aggressive species to establish,
and establishing desirable and native species can help to limit establishment of
undesirable weeds.
Cresson Project Weed Management Plan 4