DNS Planting Plan from applicant resub 7Pichner Deck and Wall Installation Critical Area and Fabitat Management Plan
LANDSERVICES NIJ
120 STATE AVE NE #190QLYMPIA, IJA 98501
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Land Services Northwest December 15, 2020
Picnner Deck and Wall Installation Critical Area and Habitat Management Plan
FIGURE 6
SITE PLAN IJITH PLANTINGZONES
<NOT A SURVEY)
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Pichner Deck and Wall Installation Critical Area and Habitat Management Plan
nstalled downslope from any disturbed earth and all earth disturbance will be limited to the
minimum necessary to achieve the purpose. No equipment or debris will be stored in the
buffer. Stormwater from the home and nearby impervious surfaces will be directed away from
the area until the vegetation has established. The bare slope will be mulched with 4 inches of
mulch as soon as possible to prevent erosion. The work will be done when the danger of
turbid discharge to the stream is minimized in the late spring. The slopes will be watered as
needed to promote vegetation growth, but not so much that it will cause erosion.
All plant installations will be done by hand to minimize the potential for erosion. Mulch will be
applied four inches thick in order to improve moisture retention and reduce erosion.
The planting plan was conducted by hand with hand tools (shovels, trowles, rakes, ect... ) with
minimal foot traffic to minimize the impact on the stabilization of the critical area. Additionally,
an extra 30 kinnikinick plants were integrated into the planting plan to cover the areas of the
vacated retaining walls to bolster the stability of the slope above zone 3 of the planting plan
Fig 6.
8.0 MITIGATION PLAN
8.1 Impacts
The project will mitigate for the unavoidable impacts to 1,452 square feet of r parian habitat
through the removal of invasive species such as English ivy and Himalayan frlackberry and
replanting of 3,812 square feet with a robust combination of groundcover, shrubs and trees.
These plants will lead to an improvement of functions and diversity ove- the existing
conditions. A net gain or positive impact is expected in landscape roughness, habitat
screening, food source, nutrient uptake and aesthetics and overall habitat resilience (Figure
5). See olanting plan
8.2 Mitigation Objectives
We will mitigate for the removal of vegetation and the installation of lawn, steps and walls by
providing a revegetation plan that will meet the projects objectives to:
a. Improve habitat as a food source and screening for wildlife
b. Prevent erosion
c. Discourage intrusion/degradation of the buffer
d. Provide aesthetic benefits for the residents in the viewshed of the projec_
e. Stem the intrusion of invasive species a
8.3 Buffer Mitigation Functions
If the buffer enhancement performs as expected, we canexpect the following lift in functions. The semi quantitative
method used in the Wetland Rating System (ECY, 2014) was adapted as the resolution of performance lift is only
valid to the semi quantitative Low, Medium, and High
Table 1 - Buffer Functions Comparison Before and After Mitigation
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lluiicA rcu
criteria
acreenmg'-""grient
Snags
Other
Structure
uptake
and
Habitat
Los
FeaturesBefore
7Medium
mitigatingmeasures
LOW
Meidum
Low
Medium
Medium
7allenualin
f1er
mitigating
High
High
Low
Medium
HighHigh
measures
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Pichrer Deck and Wall Installation Critical Area and Habitat Management Plan
8.4 Planting plan
The planting plan is provided. Trees will be planted at grade in holes 1-2 =imes the width of
the container or root ball. The mulch will be applied around each tree 2-4 inches deep in a
two -foot diameter around the tree with an edge to retain water. Rootbound trees will be cut
with sharp shears on the bottom in an x pattern to promote root growth. Four cuts will be
madte vertically to allow roots to spread. Trees will be thoroughly watered in after installation.
Shrl-bs will be installed in a similar manner.
The species selected are typical native northwest species that usually survive our summers;
however, it may be necessary to irrigate during the first two years to ensure survival. The
watering will be the minimal necessary to avoid creating erosion.
All retaining walls will be planted with kinnikinic to provide screening from the walls.
The first 15 feet along the creek will be planted with shrubs like Red osier dogwood, Pacific
ninebark and Twinberry to provide erosion protection and structure over the creek which will
provide allochthonous inputs like macroinvertebrates for the fish below.
The second thirty feet will be primarily trees like Sitka spruce, Western hem ock and
Western red cedar and Red flowering currant to provide shade that will attenuate
temperatures and eventually shade out the invasive species that have become prevalent in
the area.
The remaining area near the wails will be planted with groundcover (Salal and Roses) for
erosion protection.
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Pichrer Deck and Wall Installation Critical Area and Habitat Management Plan
Table 2 Tree/Shrub Species Quantity and Spacing (3,812 sq ft)
on
rn
EHemlock
Scientific
Name
Tsuga
heterophyfla
Spacing
15 ft
Zone
2
Quantity
5
Cost per
unit
$5.04
Total
$25.00
Western reef
cedar
Thuja plicata
15 ft
2
5
$5.00
$25.00
Sitka spruce
sicea
sitchensis
15 ft
2
5
$20 40
$140 00
Clustered
rose
Nootka rose
Red
flowering
Rosa
pisocarpa
Rosa nutkana
Ribes
sanguineum
5 ft
5 ft
loft
3
3
2
5
5
10
$5.00
$5 04
$10.00
$25.00
$25 00
$100.00
current
Red osier
dogrrvood
Cornus alba
5 ft
20
5
$5.00
$100. 00
Pacific Nine
bark
Physocarpa
capitatus
5 ft
10
5
$5.00
$25.00
Twinoerry
Lonicera
involucrata
5 ft
1
5
$5.00
$25.00
kinnikinnick
Arctostaphylos
uva-ursi
2 ft
Walls+
20
$4.00
$80 40
Sal al
Goutheria
shallon
2 ft
3
20
$2.00
$40.40
Table 3 Total Costs
8.4 Performance Standards and Monitoring
The site will be monitored for five years with the as -built as Year 0. Photo points will be
established in 2 points that capture the overall condition of the planting area. Monitoring will
begin in the spring following the installation of the plants. Year 1 will requi-e 100 percent
survival. Year 2 must have 100 percent survival of planted native plants Years 3-5 will have
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Pichrer Deck and wall Installation Critical Area and Habitat Management Plan
an 80% survival rate, if the survival rate is not met in the final year, the deficit will be replanted,
and the site will be monitored for 1 more year. The survival percentage will include 10 percent
of a-iy native non-invasive volunteers. Monitoring will occur each spring after the plants have
sprouted leaves. Management will require prior removal of any blackberries, scotch broom or
holly or other invasive plants in the planting area and replacement of any dead plants as
reg4ired to meet the performance standards. A report of management actions and photos
of the area will go to the City of Edmonds Development Center within a month following each
site monitoring event.
The invasive removal area will be monitored as well. The invasive removal area will have any
non-native blackberries grubbed out. Holly will be cut down and any other invasives
encountered will be removed by hand.
A bond will be put in place to account for 15% of the cost of plant installation which with the
added 30 kinnikinnick plants come to a total of $700.00. Making the cost of the 15% bond at
$ 10 .00
9.0 CONTINGENCIES
The City will be consulted on any contingency measures that are developed. The report willbe in
an email by the applicant and will include pictures that illustrate the condition of the mitigation site.
Contingency/maintenance activities may include, but are not limited to.
1. Replacing plants lost to vandalism, drought, or disease, as necessary;
2. Irrigating the enhancement areas only as necessary during dry weather if plants appearto
be too dry, with a minimal quantity of water;
3. Remulching areas to protect from dry weather
4. Providing protection from rodents
10.0 CONCLUSIONS
Development activities accidently occurred in the riparian buffer when the applicant installedhis
steps, retaining walls and other landscape amenities. A geotechnical report has shown that these
structures can safely remain without destabilizing the slopes and causing damage to the property.
The applicant has carefully considered the best options forrevegetaling the slopes with vegetation
that is appropriate for limiting erosion and adding stability to the slope. This restoration will
provide benefits to the area in many different ways but most importantly, it will maintain the
functions and values of the stream for the citizens of Edmond.
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