13-104419 (2)Kitts Corner Multifamily 2019 Performance Monitoring Report — Year 4
1.5. MAINTENANCE SUMMARY
During the spring and fall maintenance events, the trails and overlook in the mitigation areas
were observed to be well used by residents and wildlife. Maintenance items that were
completed this year included:
• Himalayan blackberry (Rubus armeniacus), thistle (Cirsium spp.), reed canarygrass
(Phalaris arundinacea), and poison hemlock (Conium maculatum) were removed.
• Bedstraw (Galium spp.) and evergreen bugloss (Pentalottis sempervirens) were bagged
and removed.
• All garbage on site was removed.
2.0 MITIGATION REQUIREMENTS
The mitigation areas are being measured for success according to the requirements outlined in
the approved Wetland Buffer Mitigation Plan by Talasaea Consultants, dated July 9, 2014. The
following performance standards were accepted by the City of Federal Way.
2.1. PERFORMANCE OBJECTIVES
Performance Standard Al: At least 15 species of desirable native plants will be present in the
buffer restoration and enhancement areas during the monitoring period. Percent survival of
planted woody species must be at least 100% at the end of Year 1 (per contractor warranty),
and at least 80 % for each subsequent year of the monitoring period.
Performance Standard A2 buffer restoration areas one *. Native woody species (planted
or volunteer) in the restored buffer areas shall achieve an average stem density of at least 0.03
stems per square foot by the end of Year 1 and an average stem density of at least 0.04 stems
per square foot by the end of Year 3. Total percent aerial woody plant coverage in the restored
buffer areas must be at least 35% by Year 4 and 50% by Year 5. Woody coverage may be
comprised of both planted and recolonized native species; however, to maintain species
diversity, at no time shall a single recolonized species (i.e., red alder) comprise more than 35%
of the total woody coverage. There must be at least three native species providing at least 20%
cover each, or four native species providing at least 15% cover each, or five native species
providing at least 10% cover each of the total aerial woody plant coverage.
*Note: The coverage performance standard is not applicable to existing vegetated buffer
enhancement areas because these areas already have 100% aerial coverage of woody plant
species.
_1 Performance Standard A3: Invasive/non-native weedy species shall be less than 15 percent
of total areal coverage for any year during the monitoring period within the buffer restoration and
enhancement areas. These species include, but are not limited to, Scot's broom, Himalayan
and evergreen blackberry, reed canarygrass, purple loosestrife, hedge bindweed, knotweed sp.,
and creeping nightshade. Additional species requiring control may be designated by the City or
by Talasaea Consultants during the monitoring period.
2.2. METHODOLOGY
J 2.2.1. Vegetation Sampling
Three permanent vegetation sampling transects (VSTs) were established during the baseline
assessment and evaluated for woody plant survival, stem density (Years 1-3), percent aerial
cover (Years 4-5), and percent invasive vegetation. The VSTs measure between 55 and 100
feet in length and are 10 feet wide. Percent survival of trees and shrubs will be evaluated by
performing a plant count of native desirable species colonizing the VST sampling areas and
J8 October 2019
1422M Kitts Year 4 2019 Performance Monitoring ReportV1
Copyright ® Talasaea Consultants, Inc., 2019
Page 2
Kitts Corner Multifamily
2019 Performance Monitoring Report —Year 4
expressing it as a percentage of the baseline plant count. Cover by herbaceous vegetation is
visually estimated within each sample area.
In Years 4 and 5, percent aerial cover of trees and shrubs (woody cover) will be evaluated along
each VST using the line -intercept sampling. Using line -intercept methodology, a measuring
tape is extended between two permanent markers. Shrubs and trees intercepted by the tape
are identified and the intercept distance is recorded. Percent woody cover is calculated by
totaling the intercept distances and expressing the total intercept distance as a proportion of the
tape (VST) length.
Native, desirable, colonizing species will be included are included in the survival count, stem
density, woody cover, and herbaceous cover calculations.
2.2.2. Photo Points
A series of photographs representing panoramic views of the mitigation areas were established
during the baseline assessment at seven (7) locations. The locations of the monitoring photo -
points are shown on Figure 2. These photographs document general condition throughout the
site as well as provide a qualitative representation of the performance of the mitigation areas.
The panoramic photos are presented as Figures 3-6. Photos of interpretive signage are
included on Figure 7.
2.2.3. Vegetation Sampling Data
The following table presents the data collected during the fall monitoring event (Tables 1).
Table 2. Fall 2019 Vegetation Transect Data - Year 4 (18 September 2019)
Tr -nsect #
Percent
Survival
Percent Woody
Cover**
Percent
Invasive Cover
Percent
I Herbaceous Cover I
VST-1
171.4
69.4
2.0
15.0
VST-2
151.1
65.0
0.0
5.0 1
VST-3
176.6
80.5
4.0
5.0
Average
1 166.3%
71.6%
2.0%
8.3%
Required*
80% Years 2-5
35% Year 4
50% Year 5
<15%
Not Required
Success criteria as required by the City of Federal Way
** Woody cover is not required until Year 4.
3.0 SUMMARY DATA
Talasaea Consultants conducted fall performance monitoring on 18 September 2019 for the
Kitts Corner Multifamily housing complex mitigation areas. The following is a summary of our
findings.
3.1. PERFORMANCE STANDARD Al: SPECIES DIVERSITY & WOODY SURVIVAL
A variety of trees, shrubs, groundcover species were chosen to increase structural and species
diversity of the wetland buffers. A total of 26 desirable native plant species were cataloged in
the buffer areas which satisfies Performance Standard Al (Table 2).
Table 3: Catalog of Native Vegetation in Mitigation Areas (18 September 2019)
Quantity
Scientific name
Common name
1
Acer circinatum
Vine maple
2
Acer macrophyllum
Big -leaf maple
3
Alnus rubra
Red alder
4
Amelanchier alnifolia
Serviceberry
8 October 2019 Copyright* Talasaea Consultants, Inc., 2019
1422M Kitts Year 4 2019 Performance Monitoring ReportV1 Page 3
Kitts Corner Multifamily 2019 Performance Monitoring Report — Year 4
5 1 Betula papyrifera
Paper birch
6 Cornus alba
Red -osier dogwood
7 Cornus nuttallii
Pacific Dogwood
8
Crataegus douglasii
Black hawthorn
9
Frangula purshiana
Cascara
10
Gaultheria shallon
Salal
11
Holodiscus discolor
Oceanspray
12
Mahonia aquifolium
Tall Oregongrape
13
Oemleria cerasiformis
Indian plum
14
Polystichum munitum
Sword fern
15
Populus balsamifera
Black cottonwood
16
Pseudotsuga menziesii
Douglas fir
17
Rosa gymnocarpa
Baldhip rose
18
Rosa nutkana
Nootka rose
19
Rubus parviflorus
Thimbleberry
20
Rubus spectabilis
Salmonberry
21
Sambucus racemosa
Red elderberry
22
Sorbus sitchensis
Sitka mountain ash
23
Symphoricarpos albus
Common snowberry
24
Thuja plicata
Western red cedar
25
Tsuga heterophylla
Western hemlock
26
Vaccinium ovatum
Evergreen huckleberry
Woody survival across the site was calculated at 166.3% during the fall performance monitoring.
This satisfies the woody survival requirement described in Performance Standard Al.
3.2. PERFORMANCE STANDARD A2: STEM DENSITY & WOODY COVERAGE
Installed vegetation in the mitigation areas are healthy and continue to spread through natural
propagation. Stem density is no longer required as part of the performance standards. We will
cease reporting stem density and only provide calculations for woody coverage for the
remainder of the monitoring period.
Woody coverage has increased to 71.6% in Year 4, exceeding the Year 5 standards for woody
coverage (50%) as outlined in Performance Standard A2.
3.3. PERFORMANCE STANDARD A3: INVASIVE SPECIES
At the time of the fall monitoring event, maintenance had recently been completed and percent
invasive/non-native cover was estimated at 2%, satisfying Performance Standard A3.
Invasive and non-native species coverage has been maintained under 15% for the duration of
the monitoring period.
4.0 CONCLUSIONS
The fall 2019 performance monitoring for the wetland buffer areas at Kitts Corner Multifamily
development was conducted to evaluate site conditions, to record the health and growth of the
vegetation, and to evaluate wildlife usage of the site.
The buffer areas were observed to be mulched and stable with no signs of erosion or rilling.
The rock -lined swale was stable and no over -bank scour was observed. One snag and
numerous down logs and stumps were placed in the buffer mitigation areas to provide habitat
features for wildlife. A bird -nesting box was attached to the snag to initially augment the natural
8 October 2019
1422M Kitts Year 4 2019 Performance Monitoring ReportV1
Copyright ® Talasaea Consultants, Inc., 2019
Page 4
Kitts Corner Multifamily
2019 Performance Monitoring Report —Year 4
habitat for swallow species. Birds, mammals, reptiles, amphibians, and invertebrates observed
in the wetland buffer areas (either by direct or indirect means) identified and recorded during
this and previous site visits includes: Anna's hummingbird, American robin, dark -eyed junco,
red-tailed hawk, a pair of mallards, butterfly, and several dragonfly species. As vegetation
grows and matures, we expect wildlife species usage will increase.
Four interpretive signs were installed at this site to provide environmental education to the
residents about wetlands and buffers. The signs were installed within the passive recreation
trails with the intent to help residents feel invested in the environment in which they live. Photos
of the interpretive signs have been include to illustrate their upkeep and maintenance (Figure
7).
The mitigation areas are healthy and are expected to exceed all required performance
standards by the end of the monitoring period. Twenty-six (26) desirable tree and shrub species
were identified within the buffer areas as well as 166.3% survival during the fall monitoring
event, meeting the requirements outlined in Performance Standard Al. Woody coverage
measured at 71.6%, far exceeding the Year 4 standards described in Performance Standard
A2. Routine maintenance is scheduled to occur biannually to control and eradicate invasive
and non-native species below 15% cover. Percent cover during the fall monitoring event was
calculated at 2.0% due to recent maintenance efforts, meeting Performance Standard A3.
The mitigation areas are showing signs of both increased species and structural diversity, which
will provide additional habitat for wildlife in an urban setting. Rainwater runoff from select
buildings are dispersed into the wetland buffers via dispersion trenches, providing additional
hydrology to the wetlands. The two soft -surface trails, viewpoints and interpretive signage
provide an opportunity for passive recreation and environmental education. The mitigation
wetland buffer areas are likely providing improved water quality to the network of adjacent
wetlands and streams, including West Hylebos Wetlands Park and West Hylebos Creek.
8 October 2019
1422M Kitts Year 4 2019 Performance Monitoring ReportV1
Copyright ® Talasaea Consultants, Inc., 2019
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RECEIVED
� ST_ ALASAEA
CONSULTANTS, INC.
TO: Jim Harris
OF: City of Federal Way
Federal Way City Hall
3325 8th Ave S
Federal Way, WA 98003
TRANSMITTING THE FOLLOWING
letter
duplicate copies
X report
originals
specifications
proposal
other
SEP 18 2020
Community Development
Department
LETTER OF TRANSMITTAL
FROM: Aaron Ellig
PROJECT: Kitts Corner Multifamily
TAL-1422M
SUBJECT: Year 5 Performance Monitoring Rpt
DATE: 15 September 2020
FOR:
review & comment
information
X approval
use & files
as requested
action noted
?( submittal
1 DESCRIPTION OF MATERIALS:
Attached is the Wetland Buffer Mitigation Plan — 2020 Performance Monitoring Report Year 5
for the mitigation areas associated with the Kitts Corner Multifamily Apartments (City Project No.
13-104418-00-UP & 23-104419-SE). Please review and let me know if you have any questions or
comments.
Thank you,
_J
Aaron Ellig
Ecologist
Sent via: Mail x Courier Other
cc:
X File
X Mr. Tom Neubauer, tom.neubauer@heartiand.wa.com
Resource & Environmental Planning
l i020 Bear Creek Road Northeast • Woodinville, Washington 98072 • Bus: (425) 861-7550 • Pax: (425) 861-7549 • Email: exvarren@ talaseea cum
WETLAND BUFFER MITIGATION PLAN
2020 PERFORMANCE MONITORING REPORT - YEAR 5
KITTS CORNER MULTIFAMILY
CITY OF FEDERAL WAY
PROJECT NO. 13-104418-00-UP & 23-104419-SE
FEDERAL WAY, WASHINGTON
Prepared For
KITTS CORNER MULTIFAMILY
c/o DevCo, Inc.
10900 NE 811 Street, Suite 1200
Bellevue, Washington 98004
Prepared By
TALASAEA CONSULTANTS, INC
15020 Bear Creek Road NE.
Woodinville, Washington 98077
(425) 861-7550
15 September 2020
Kitts Corner M
TABLE OF CONTENTS
2020 Performance Monitoring Report - Year 5
1.0
PROJECT OVERVIEW .................... ..........................................................
-- ............................. 1
1.1.
PROJECT SUMMARY...................................................................................................................1
1.2.
SITE LOCATION...........................................................................................................................1
1.3.
PROJECT TIMEFRAME.................... .....:.................... ........................... ..........................................
1
1.4.
PERFORMANCE SUMMARY ................................................ .............................................................
-2
1.5,
MAINTENANCE SUMMARY .................. .....,...-................... ..............................................
------------ --2
2.0
MITIGATION REQUIREMENTS................................................................................--.--..............2
2.1.
PERFORMANCE OBJECTIVES........................................................................................................2
2.2.
METHODOLOGY ......................... ............... :............................ .........:...............
--- ..................... 3
2.2.1.
Vegetation Sampling ........ ................. :..........:...... ,..,..-........... ,......
............. ..................... .....3
2.2.2
Photo Points ...............
2.2.3.
Vegetation Sampling Data .................. ..................................... ...........................................
3
3.0
SUMMARY DATA.......................................................................................................................4
3.1.
PERFORMANCE STANDARD Al : SPECIES DIVERSITY & WOODY SURVIVAL
.......................................4
3.2.
PERFORMANCE STANDARD AZ STEM DENSITY & WOODY COVERAGE......................
.....:................4
3.3.
PERFORMANCE STANDARDA3: INVASIVESPECIES.........................................................................5
4.0
CONCLUSIONS ......................... -............. ............................................................ ...................... 5
Figures
Figure 1:
Vicinity Map & Directions
Figure 2:
Vegetation Transect & Photo Point Locations
Figure 3:
Baseline & Year 5 Photo Point 1
Figure 4:
Baseline & Year 5 Photo Point 2
Figure 5:
Baseline & Year 5 Photo Point 3
Figure 6:
Baseline & Year 5 Photo Point 4
Figure 7:
Baseline & Year 5 Photo Point 5
Figure 8:
Baseline & Year 5 Photo Point 6
Figure 9:
Baseline & Year 5 Photo Point 7
Figure 10:
Interpretive Signage
List of Tables
Table 1: Baseline Assessment Data — Year 0 (25 February 2016)...................................... 3
Table 2: Fall 2020 Vegetation Transect Data — Year 5 (10 September 2020)....... 3
Table 3: Catalog of Native Vegetation in Mitigation Areas (10 September 2020)...-- ................:. 4
15 September 2020 Copyright ' Talasaea Consultants, Inc., 2020
1422M Kitts Year 5 2020 Performance Monitoring Report Page i
Kitts Corner Multifamily
1.0 PROJECT OVERVIEW
2020 Performance Monitoring Report — Year 5
CITY OF FEDERAL WAY PERMIT NO. 11 3-104418-00-UP & 23404419-SE
Permittee: DevCo, Inc.
10900 NE 8th Street, Suite 1200
Bellevue, Washington 98004
Contact: Mr. Tom Neubauer, tom.neubauer@heartlandwa.com
Consultant: Talasaea Consultants, Inc.
15020 Bear Creek Road NE
Woodinville, Washington 98077
(425) 861-7550
Contact: Ann Olsen, Senior Project Manager, aolsen@talasaea.com
Aaron Ellig, Ecologist, aellig@talasaea.com
Field Survey: Conducted on 10 September 2020 by Aaron Ellig
1.1. PROJECT SUMMARY
The purpose of the approved mitigation plan was to 1) provide passive recreation in the buffers
for Wetlands 1 and 2 consistent with City guidelines, 2) restore wetland buffer areas disturbed
by temporary construction impacts, and 3) enhance degraded buffer areas. To accomplish
these goals, the mitigation included the following:
• Passive recreation opportunities within the wetland buffer through the construction of
two soft -surface pedestrian trails with viewpoints, benches, and four interpretive signs;
• Restoration of the functions and values of the wetland buffer lost due to temporary
impacts from site construction by restoring approximately 6,919 sf of buffer area; and
• Enhancement of 31,214 sf of degraded buffer areas.
1.2. SITE LOCATION
The subject property is located at 1173 S 336th St, Federal Way as shown in Figure 1. The
mitigation areas are located on both the west and east property lines and are identifiable by
either a 2-rail fence or black vinyl coated chain -link fence. Critical Area Protection Area signs
are posted along the buffer boundaries. Driving directions to the Project Site are located in
Figure 1.
1.3. PROJECT TIMEFRAME
Construction of the mitigation areas was completed in January 2016 and monitoring is required
by the City of Federal Way for five years (concluding in 2020). A baseline assessment was
conducted on February 25, 2016, to document baseline conditions at Year 0. Routine
performance monitoring began in spring 2016 according to the approved monitoring schedule.
Maintenance reviews were conducted in the spring and fall of each year to address any
maintenance concerns and a maintenance memo was sent to the landscaping contractor
detailing maintenance items to be completed. Annual performance monitoring reports were
prepared in the fall and included data from the performance monitoring events. This report
includes data from the fall 2020 monitoring event and concludes Year 5 of required monitoring.
The Site has consistently met all approved performance standards for the duration of the
monitoring period. At this time we would like to re nest final sign -off with the City of Federal
Way.
15 September 2020 Copyright"'' Talasaea Consultants, Inc., 2020
1422M Kitts Year 5 2020 Performance Monitoring Report Page 1
Kitts Corner Multifamily
1.4. PERFORMANCE SUMMARY
2020 Performance Monitoring Report — Year 5
To evaluate performance standards for the project, future monitoring was compared to the
baseline conditions documented on February 25, 2016. The installed vegetation within the
mitigation areas appears healthy and continues to show new growth. All performance
standards are being met at this time.
1.5. MAINTENANCE SUMMARY
During the spring and fall maintenance events, the trails and overlook in the mitigation areas
were observed to be well used by residents and wildlife. Maintenance items that were
completed this year included:
• Removal of Himalayan blackberry (Rubus armeniacus), thistle (Cirsium spp.), reed
canarygrass (Phalaris arundinacea), and poison hemlock (Conium maculatum);
• Bedstraw (Gallium spp.) and evergreen bugloss (Pentaglottis sempervirens) were
bagged and removed;
• All broken or damaged mitigation fencing was repaired or replaced; and
• All garbage was picked up and removed from the mitigation areas.
2.0 MITIGATION REQUIREMENTS
The mitigation areas are being measured for success according to the requirements outlined in
the approved Wetland Buffer Mitigation Plan by Talasaea Consultants, dated July 9, 2014. The
following performance standards were accepted by the City of Federal Way.
2.1. PERFORMANCE OBJECTIVES
Performance Standard A 1: At /east 15 species of desirable native plants will be present in the
buffer restoration and enhancement areas during the monitoring period. Percent survival of
planted woody species must beat least 100% at the end of Year 1 (per contractor warranty),
and at least 80% for each subsequent year of the monitoring period.
Performance Standard A2 buffer restoration areas only)*: Native woody species (planted
or volunteer) in the restored buffer areas shall achieve an average stem density of at least 0. 03
stems per square foot by the end of Year 1 and an average stem density of at least 0.04 stems
per square foot by the end of Year 3. Total percent aerial woody plant coverage in the restored
buffer areas must be at least 35% by Year 4 and 50% by Year 5. Woody coverage may be
comprised of both planted and recolonized native species; however, to maintain species
diversity, at no time shall a single recolonized species (i.e., red alder) comprise more than 35%
of the total woody coverage. There must be at least three native species providing at least 20%
cover each, or four native species providing at least 15% cover each, or five native species
providing at least 10% cover each of the total aerial woody plant coverage.
*Note: The coverage performance standard is not applicable to existing vegetated buffer
enhancement areas because these areas already have 100% aerial coverage of woody plant
species.
Performance Standard A3: Invasive/non-native weedy species shall be less than 15 percent
of total areal coverage for any year during the monitoring period within the buffer restoration and
enhancement areas. These species include, but are not limited to, Scot's broom, Himalayan
and evergreen blackberry, reed canarygrass, purple loosestrife, hedge bindweed, knotweed sp.,
and creeping nightshade. Additional species requiring control maybe designated by the City or
by Talasaea Consultants during the monitoring period.
15 September 2020
1422M Kitts Year 5 2020 Performance Monitoring Report
Copyright " Talasaea Consultants, Inc, 2020
Page 2
Kitts Corner Multifamily
2.2. METHODOLOGY
2.2.1. Vegetation Sampling
2020 Performance Monitoring Report - Year 5
Three (3) permanent vegetation sampling transects (VSTs) were established during the
baseline assessment and evaluated for woody plant survival, stem density (Years 1-3), percent
areal cover (Years 4-5), and percent invasive vegetation. The VSTs measured between 55 and
100 feet in length and are 10 feet wide. Percent survival of trees and shrubs was evaluated by
performing a plant count of native desirable species colonizing the VST sampling areas and
expressing it as a percentage of the baseline plant count. Cover by herbaceous vegetation was
visually estimated within each sample area.
In Years 4 and 5, percent areal cover of trees and shrubs (woody cover) was evaluated along
each VST using line -intercept sampling. Using line -intercept methodology, a measuring tape is
extended between two permanent markers. Shrubs and trees intercepted by the tape are
identified and the intercept distance is recorded. Percent woody cover is calculated by totaling
the intercept distances and expressing the total intercept distance as a proportion of the tape
(VST) length.
Native, desirable, colonizing species were included in the survival count, stem density, woody
cover, and herbaceous cover calculations.
2.2.2. Photo Points
A series of photographs representing panoramic views of the mitigation areas were established
during the baseline assessment at seven (7) locations. The locations of the monitoring photo -
points are shown in Figure 2. These photographs document general conditions throughout the
Site as well as provide a qualitative representation of the performance of the mitigation areas.
The panoramic photos are presented as Figures 3-9. Photos of interpretive signage are
included in Figure 10.
2.2.3. Vegetation Sampling Data
The following table presents the data collected during the baseline assessment (Table 1) and
the fall monitoring event (Table 2).
Table 1: Baseline Assessment Data -_Year 0 25 February 2016)
Transect #
VST-1
Percent
Survival
100
Stem
Density
0.09
Percent Woody
Cover**
3.0
Percent
Invasive Cover
0.0
Percent Herbaceous
Cover
0.0
VST-2
100
0.08
2.0
0.0
0.0
VST-3
100
0.06
4.0
0.0
0.0
Average
100%
0.08
3.0%
0.0%
0.0%
Required*
Y 100% Year 1
80% Years 2-5
0.03 Year 1
0.04 Year 3
35% Year 4
50% Year 5
<15%
Not Required
*Success criteria as required by the City of Federal Way
** Woody cover is not required until Year 4
Table 2. Fall 2020 Vegetation Transect Data - Year 5 (10 September 2020)
Transect #
Percent
Survival
Percent Woody
Cover*'
Percent
Invasive Cover
Percent
Herbaceous Cover
VST-1
169.6
79.2
3.0 _
15.0
VST-2
230.2
198.3
74.3
0.0 _
5.0
_ 10.0
10.0
VST-3
83.0
Average
199.4%
78.8%
2.3%
11.6%
Required*
80% Years 2-5
35% Year 4
50% Year 5
<15%
Nat Required
*Success criteria as required by the City of Federal Way
** Woody cover is not required until Year 4,
15 September 2020
1422M Kitts Year 5 2020 Performance Monitoring Report
Copyright'' Talasaea Consultants, Inc., 2020
Page 3
Kitts Corner Multifamily
3.0 SUMMARY DATA
2020 Performance Monitoring Report — Year 5
Talasaea Consultants conducted fall performance monitoring on 10 September 2020 for the
Kitts Corner Multifamily housing complex mitigation areas. The following is a summary of our
findings.
3.1. PERFORMANCE STANDARD Al: SPECIES DIVERSITY & WOODY SURVIVAL
A variety of trees, shrubs, groundcover species were chosen to increase structural and species
diversity of the wetland buffers. A total of 26 desirable native plant species were cataloged in
the buffer areas which satisfies Performance Standard Al (Table 3).
Table 3: Catalog
of Native Vegetation in Mitigation
Scientific name
Acer circinatum
Acermacrophyllum
Areas (10 September 2U2U)
Common name
Vine maple
Big -leaf maple
Quantity
1
2
3
Alnus rubra
Red alder
4
Amelanchier alnifolia
Serviceberry
5
Betula papyrifera
Paper birch
6
Cornus alba
Red -osier dogwood
7
Cornus nuttallii
Pacific Dogwood
8
Crataegus douglasii
Black hawthorn
9
Frangula purshiana
Cascara
10
Gaultheria shallon
Salal
11
Holodiscus discolor
Oceanspray
12
Mahonia aquifolium
Tall Oregongrape
13
Oemleria cerasiformis
Indian plum
14
Polystichum munitum
Sword fern
15
Populus balsamifera
Black cottonwood
16
Pseudotsuga menziesii
Douglas fir
17
Rosa gymnocarpa
Baldhip rose
18
Rosa nutkana
Nootka rose
19
Rubus parviflorus
Thimbleberry
20
Rubus spectabilis
Salmonberry
21
Sambucus racemosa
Red elderberry
22
Sorbus sitchensis
Sitka mountain ash
23
Symphoricarpos albus
Common snowberry
24
Thuja plicata
Western red cedar
25
Tsuga heterophylla
Western hemlock
26
Vaccinium ovatum
Evergreen huckleberry
Woody survival across the Site was calculated at 199.4% during the fall performance
monitoring. This satisfies the woody survival requirement described in Performance Standard
Al.
3.2. PERFORMANCE STANDARD A2: STEM DENSITY & WOODY COVERAGE
Installed vegetation in the mitigation areas are healthy and continue to spread through natural
propagation. Stem density is no longer required as part of the performance standards. We
have ceased reporting stem density and only provided calculations for woody coverage.
Woody coverage has increased to 78.8% in Year 5, exceeding the Year 5 standards for woody
coverage of 50% as outlined in Performance Standard A2.
15 September 2020 Copyright"' Talasaea Consultants, Inc., 2020
1422M Kitts Year 5 2020 Performance Monitoring Report Page 4
Kitts Corner Multifamily 2020 Performance Monitoring Report— Year 5
3.3. PERFORMANCE STANDARD A3: INVASIVE SPECIES
At the time of the fall monitoring event, maintenance had recently been completed and percent
invasive/non-native cover was estimated at 2.3%, satisfying Performance Standard A3.
Invasive and non-native species coverage has been maintained under 15% for the duration of
the monitoring period.
4.0 CONCLUSIONS
The fall 2020 performance monitoring for the wetland buffer areas at Kitts Corner Multifamily
development was conducted to evaluate site conditions, to record the health and growth of the
vegetation, and to evaluate wildlife usage of the Site.
The buffer areas were observed to be stable with no signs of erasion or rilling. The rock -lined
swale was stable and no over -bank scour was observed. One snag and numerous down logs
and Stumps were placed in the buffer mitigation areas to provide habitat features for wildlife. A
bird -nesting box was attached to the snag to initially augment the natural habitat for swallow
species. Birds, mammals, reptiles, amphibians, and invertebrates observed in the wetland
buffer areas (either by direct or indirect means) identified and recorded during this and previous
site visits include Anna's hummingbird, American robin, dark -eyed junco, red-tailed hawk, a pair
of mallards, butterfly, and several dragonfly species. As vegetation grows and matures, we
expect wildlife species usage will continue to increase.
Four (4) interpretive signs were installed at this site to provide environmental education to the
residents about wetlands and buffers. The signs were installed within the passive recreation
trails with the intent to help residents feel invested in the environment in which they live. Photos
of the interpretive signs have been included to illustrate their upkeep and maintenance (Figure
10).
The mitigation areas are healthy and are exceeding all required performance standards.
Twenty-six (26) desirable tree and shrub species were identified within the buffer areas with
199.4% survival during the fall monitoring event, meeting the requirements outlined in
Performance Standard Al. Woody coverage measured at 78.8%, far exceeding the Year 5
requirements described in Performance Standard A2. Routine maintenance has occurred
biannually to control and maintain invasive and non-native species below 15% cover. Percent
cover of invasive species during the fall monitoring event was calculated at 2.3% due to recent
maintenance efforts, meeting Performance Standard A3.
The mitigation areas are showing increases in species diversity and structural diversity, which
will provide additional habitat for wildlife in an urban setting. Rainwater runoff from select
buildings is dispersed into the wetland buffers via dispersion trenches, providing additional
hydrology to the wetlands. The two soft -surface trails, viewpoints, and interpretive signage
provide an opportunity for passive recreation and environmental education. The wetland buffer
areas are likely providing improved water quality to the network of adjacent wetlands and
streams, including West Hylebos Wetlands Park and West Hylebos Creek.
The Site has consistently met all approved performance standards for the duration of the
monitoring period. At this time we would like to reguest final sign -off with the City of Federal
Way.
15 September 2020 Copyright"Talasaea Consultants, Inc., 2020
Page 5
1422M Kitts Year 5 2020 Performance Monitoring Report
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ADDRE55: 1201 5 EI36TIH STREET
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F I OURS # 1
TALASAEA
CONSULTANTS, INC. VICINITY MAP a DIRECTIONS
Resource & Environmental Planning KITTS GORNER MULTIFAMILY
15020 Bear Creek Road Northeast FEDERAL WAY, NASHINGTON
Woodinville, Washington 98077
Bus (425)861-7550 - Fax (425)861-7549
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b
DESIGN DRAWN PROJECT
A4 A55 1422M
SCALE
NTS
DATE I F
12-IG-2015
REVISED r
2-22-2016
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