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Caldwell Mitigation Planting & Monitoring Plan MSA | i
Caldwell Residential Development
Mitigation Planting & Monitoring Plan
June 4, 2021
For: Dan & Tami Caldwell
486 SE Gabert Road
Gresham, OR 97088-5508
Jefferson County Parcel: 931500112
Permit # SDP2021-00003
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Table of Contents
1 Project Overview .................................................................................................................................. 1
1.1 Introduction ................................................................................................................................. 1
1.2 Applicant Information ................................................................................................................. 1
1.3 Project Location ........................................................................................................................... 1
1.4 Project Description ...................................................................................................................... 2
2 Summary of Existing Conditions ......................................................................................................... 4
3 Mitigation ............................................................................................................................................. 4
3.1 Proposed Mitigation .................................................................................................................... 4
3.2 Mitigation Goals .......................................................................................................................... 4
4 Performance Standards ......................................................................................................................... 5
4.1 Buffer Enhancement .................................................................................................................... 5
4.2 Emergent Cover ........................................................................................................................... 5
4.3 Survival........................................................................................................................................ 5
4.4 Invasive Species .......................................................................................................................... 6
4.5 Soil ............................................................................................................................................... 6
5 Approach .............................................................................................................................................. 6
5.1 Site Preparation ........................................................................................................................... 6
5.2 Plant Procurement ....................................................................................................................... 6
5.3 Planting Instructions .................................................................................................................... 6
5.4 Inspection and Maintenance Criteria ........................................................................................... 7
6 Planting Plan ........................................................................................................................................ 8
7 Monitoring .......................................................................................................................................... 14
7.1 As-Built Report ......................................................................................................................... 14
7.2 Monitoring Schedule ................................................................................................................. 14
7.3 Monitoring Methods .................................................................................................................. 14
8 Maintenance ....................................................................................................................................... 15
Attachment 1. Site Photos ........................................................................................................................... 16
Attachment 2. Native Plant Sources for the Pacific Northwest .................................................................. 21
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List of Figures
Figure 1. Vicinity Map .................................................................................................................................. 1
Figure 2. Proposed Site Plan ......................................................................................................................... 3
Figure 3. Planting Instructions ...................................................................................................................... 7
Figure 4. Planting Areas ............................................................................................................................... 8
List of Tables
Table 1. Area A: 5 shrubs with a mix of at least two species from list. Native Salal and Evergreen
Huckleberry are naturalizing here. This is also an English Ivy removal area. .............................................. 9
Table 2. Area B: 10 plants with a mix of at least three species from list. Native Salal and Rose are
naturalizing here. ......................................................................................................................................... 10
Table 3. Area C: 6 shrubs and 2 trees with a mix of at least two shrub species from the list. Native Salal
and Rose are naturalizing here. ................................................................................................................... 11
Table 4. Area D: 2 small trees would work well here. This is north of the Golden Chain tree on a small,
sloped area. ................................................................................................................................................. 12
Table 5. Area E: 20 plants with a mix of at least 4 different species from the list. Native Salal and
Huckleberry in this area already. ................................................................................................................ 13
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1 Project Overview
1.1 Introduction
A mitigation planting and monitoring plan has been prepared by Marine Surveys & Assessments
(MSA) to compensate for the development of new vertical expansion on an existing single-
family structure within a critical area buffer. This plan developed for Dan and Tami Caldwell is
in compliance with the Jefferson County Code (JCC) 18.25.660(9)(a)(iii) for no net loss
mitigation.
1.2 Applicant Information
Name: Dan & Tami Caldwell
Mailing Address: 486 SE Gabert Road, Gresham, OR 97088-5508
Phone Number: 503-310-1841
Email Address: sj24dgc@gmail.com
1.3 Project Location
NE ¼ of Section 4, Township 28N, Range 1E
Address: 990 Olympus Blvd, Port Ludlow, WA 98365
Jefferson County Parcel: #931500112
Latitude: North 47º57’15.17”; Longitude: West -122º40’45.43”
Figure 1. Vicinity Map
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1.4 Project Description
The proposed work is the expansion of an existing non-conforming single-family residential
structure vertically by more than 25%. The house currently has an unfinished basement and a
first floor, both of which will be finished or remodeled within the existing footprint. The
footprint for the proposed upper floor will be smaller than the existing house footprint but will
result in an increase greater than 25%. The residential expansion is proposed along Admiralty
Inlet (Figure 2). Because a vertical expansion of more than 25% is proposed, a planting plan is
required as per Jefferson County Code (JCC) 18.25.660(9)(a) for legal nonconforming
developments.
(9) Expansion/Enlargement with a Conditional Use Permit.
(a) The administrator shall require a conditional use permit for any of the following:
(i) Enlargement or expansion of nonconforming single-family residences by the
addition of space to the exterior of the main structure or normal appurtenances where
the total footprint will increase by more than 25 percent or the expansion/enlargement
occurs vertically, laterally or landward, but not waterward, of the structure.
(ii) Enlargement or expansion of single-family residences where the addition of space
to the exterior of the main structure is likely to adversely affect critical areas, or is
likely to obstruct the view of an adjacent development.
(iii) When allowed, an equivalent area of shoreline buffer area shall be enhanced
through planting of native vegetation, plus additional mitigation to be required as
appropriate. The administrator shall require a planting plan to ensure this standard is
implemented.
The original 962 ft2 home will not expand landward or waterward, but will increase vertically by
more than 25% with the addition of a second floor. No other existing structures at the site will be
modified or removed at this time. This plan outlines MSA’s recommendations to mitigate for the
building area within the critical area buffer.
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Figure 2. Proposed Site Plan
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2 Summary of Existing Conditions
The project is located on a 1.55 acre parcel located in an area zoned as Rural Residential – One
Unit per 5 Acres (RR-5). The parcel is bordered on the north and south sides by similarly
wooded shorefront rural residential properties. Olympus Boulevard borders the west side of the
parcel and to the east is Admiralty Inlet.
The parcel slopes to the east towards Admiralty Inlet. Native vegetation is abundant adjacent to
the shoreline. Native species include: Western Red Cedar (Thuja plicata), Douglas Fir
(Pseudotsuga menziesii), Western Hemlock (Tsuga heterophylla), Sword Fern (Polystichum
munitum), Lady Fern (Athyrium felix-femina), Salal (Gaultheria shallon), Red Elderberry
(Sambucus racemosa), Western Azalea (Rhododendron macrophyllum), Evergreen Huckleberry
(Vaccinium ovatum), Nootka Rose (Rosa nutkana), Red Flowering Currant (Ribes sanguineum),
Thimbleberry (Rubus parviflorus), Serviceberry (Amelanchier alnifolia), ornamental landscape
species, grass species and some invasive English Ivy (Hedera hlix).
3 Mitigation
3.1 Proposed Mitigation
The intent of this mitigation plan is to minimize potential impacts caused by the construction
project and vertical expansion by enhancing ecological value and function on the site. Planting
areas have been identified around the structure, adjacent to the shoreline. The area is already
nicely vegetated with native species except for a few small patches of English Ivy (see
Attachment 1 for site photos). All of the areas contain small, volunteer Salal (Gaultheria
shallon). Salal should not be pulled in order to plant other species. Native volunteer species will
be included in the percent cover performance standard as will the removal of English Ivy. Five
planting areas have been identified (Figure 4) and will be monitored for success as per the
performance standards listed later on. Those areas are labeled A - E and can be seen in section 6
below.
3.2 Mitigation Goals
Goal (1) Buffer Enhancement: Add native species in planting areas within the buffer. The new
planting areas will total at least 962 ft2 (1:1 mitigation for new expansion within the buffer) and
will be located in five areas on the property (Figure 4). The planting plan will enhance the
ecological value and function of the habitat within the critical area buffer by reducing erosion,
improving nutrient input, and creating wildlife habitat.
Goal (2) Emergent Cover: 60% by year one, 80% by year three, 90% by year five.
Goal (3) Survival: 100% by year one, 85% survival by year five.
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Goal (4) Invasive Species: No more than 10% cover by invasive species in any monitoring year.
Goal (5) Soil: For newly planted plants, deconsolidate and amend soil where holes are dug
before plants are installed and add a minimum of 3” mulch.
4 Performance Standards
Performance standards are measurable criteria for determining if the goals and objectives of the
mitigation project are being achieved. All installed plants will be measured, photographed, and
monitored using the following performance standards:
4.1 Buffer Enhancement
Native plants will be installed in year one and photographs will be taken during subsequent
monitoring years. A comparison of photographs from previous years along with the percent
cover and survivorship standards outlined below will help in assessing the quality of the buffer.
The planting areas are outlined in Figure 4, as well as a plant list for each planting area, can be
found in Tables 1-5 in section 6.
Photo stations for the planting sites will be determined once the plants are installed and an as-
built report will be the baseline for future monitoring years. To meet survival performance
standards, individual plants that die must be replaced with the same species unless otherwise
suggested by the project biologist due to site conditions.
4.2 Emergent Cover
The percent cover standard will be monitored by using the Point Intercept Method of surveying
the planting plots. One or more transect lines will be established by stretching a measuring tape
between two points. The location of the transect will be staked and flagged at each end so that
the same transect can be surveyed each monitoring year. A data form will be used to collect
information at a minimum of 5-foot intervals, stopping along the tape to record what is located
directly beneath it at each interval point. If no plants are present, bare ground will be noted. Once
data is recorded, the following formula will be used to calculate the percent of bare ground:
(# of points with bare ground / total # of points evaluated) x 100 = % of bare ground
4.3 Survival
Immediately after planting, all plants will be counted and documented. At the end of each
growing season (late August - early September), plots will be visited and a count of surviving
plants will be documented. The percent survival for the plots will be calculated by dividing the
total number of plants after planting by the total number of surviving plants at the end of the
season.
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4.4 Invasive Species
Invasive species will be kept below 10% during all monitoring years. No chemicals shall be used
for invasive species control, only mechanical methods.
4.5 Soil
A minimum of 20% organic matter by bulk density in the soil will be verified by invoices.
5 Approach
5.1 Site Preparation
Topsoil around and beneath newly installed native plants will be comprised of a minimum of
20% organic matter. MSA recommends that the amended soil consist of 6” of coarse sand and 6”
of vegetative compost, which should be worked into the soil before planting. After plant
installation, a layer of mulch at least 3” thick will be placed as a groundcover around the plants.
5.2 Plant Procurement
Plants will be selected from a regional native plant nursery. See Attachment 2 for a list of native
plant nurseries and resources.
5.3 Planting Instructions
Whenever possible, planting should be done between mid-October and mid-December as plants
grow roots during the cool weather, even when the tops of the plants are dormant. Planting
between mid-December and mid-April is also acceptable but more attention to supplemental
watering may be required due to drier seasonal weather conditions. Any nursery instructions that
come with the plants should be read and followed.
Plants should be laid out by hand. Dig a bowl-shaped hole for each plant at least twice the width,
and slightly deeper, than the potted plant’s container. Roughen the sides and the bottom of the
hole with a pick or shovel. If the soil is especially dry, fill the hole with water and let it soak in
before continuing.
Remove the plant from its container gently without pulling on the stem of the plant. Loosen
bound roots on the outer inch of soil and cut any roots that encircle the root ball to ensure that the
plant will not continue to grow within its “memory” of the pot wall confines. Set the plant in the
hole so that the top of the soil remains level with the surrounding soil. Fill the surrounding space
with loose topsoil comprised of at least 20% organic matter. Native topsoils are preferred,
whenever possible. Cover any exposed roots but do not pile dirt onto the stem or root collar, as
this can kill some plants. To discourage root rot, gently tamp down the filled soil to remove any
air pockets that may exist below ground, while allowing the soil to remain somewhat loose.
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Form a temporary basin or trench around each plant to encourage water collection, and then
water thoroughly (Figure 3).
Figure 3. Planting Instructions
(sourced from City of Seattle Department of Planning and Development Environmentally Critical Areas
Standard Mitigation Plan)
Immediately after watering, mulch such as wood chips, leaves, or brown carbon rich compost
should be added to a 3” thickness over the entire planting area without covering the stems of the
plants. The mulch will aid in moisture, nutrient retention, and weed control. Heavyduty
woodchips are preferable in areas where noxious or invasive species may become a problem.
Staking of trees or shrubs should not be necessary unless in an area of high winds or the tree is
tall and has little roots. If staking is deemed necessary, use a thick rope or padding around the
trunk of the tree to prevent damage to the bark, and use the minimum amount of tension
necessary to achieve balance.
5.4 Inspection and Maintenance Criteria
Maintenance must be done twice yearly. No herbicides or pesticides are to be used, and all work
should be performed by hand whenever possible, with the lightest possible equipment where
such use is necessary.
During year one, every failed plant must be replaced. During year one, and during the first year
after any replacement planting, plantings must receive one inch of water at least once weekly
between June 15 and September 15. Trees and shrubs must be weeded to the dripline, and mulch
must be maintained at a depth of three inches. Weed herbaceous plantings as necessary (flowers,
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ferns, etc.). All litter and non-native vegetation must be removed and properly disposed of off-
site.
6 Planting Plan
To cover a minimum of 962 ft2 with native plants, it has been determined that 45 plants will be
required in five planting areas (Figure 4). There are no spacing requirements, only a total number
of plants per area in order to preserve the already thriving Salal, which is an excellent erosion
control plant and provides habitat. Plant species appropriate for this site are listed in the tables
below. Each table represents a planting area and plant numbers are dependent upon the amount
of existing native vegetation already present. Quantity of species chosen for planting will be
recorded during the as-built visit. This will allow the applicant more freedom to design an
aesthetically pleasing landscape. Plants will be selected from a regional native plant nursery. The
species in the following tables were chosen to create bird and insect habitat, while taking into
account hardiness, ecology, and aesthetics. Site photos of the proposed planting areas can be
seen in Attachment 1.
Figure 4. Planting Areas
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Table 1. Area A: 5 shrubs with a mix of at least two species from list. Native Salal and Evergreen
Huckleberry are naturalizing here. This is also an English Ivy removal area.
Quantity Botanical Name Common Name Spacing Sun/Shade
TBD Holodiscus discolor Oceanspray Spacing: 4’
O.C. - shrub Sun or shade
TBD Vaccinium ovatum Evergreen
Huckleberry
Spacing: 4’
O.C. - shrub Shade or partial sun
TBD Rosa nutkana Nootka Rose Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Symphoricarpos albus Snowberry Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Mahonia aquifolium Tall Oregon Grape Spacing: 4’
O.C. - shrub Sun or shade
TBD Polystichum munitum Sword Fern Spacing: 2’
O.C. - shrub Shade or partial sun
TBD Ribes sanguineum Red Flowering
Currant
Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Rubus spectabilis Salmonberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Rubus parviflorus Thimbleberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Corylus cornuta Beaked Hazelnut Spacing: 4’
O.C. - shrub Sun to shade
TBD Pinus contorta var.
contorta Shore Pine Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Salix hookeriana Hookers Willow Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Rhamnus purshiana Cascara Spacing: 8’
O.C. - Tree Sun to shade
TBD Cornus nuttallii Pacific Dogwood Spacing: 8’
O.C. - Tree Part shade
TBD Thuja plicata Western Redcedar Spacing: 8’
O.C. - Tree Part shade to shade
TBD Pseudotsuga
menziesii Douglas-fir Spacing: 8’
O.C. - Tree Sun to part shade
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Table 2. Area B: 10 plants with a mix of at least three species from list. Native Salal and Rose are
naturalizing here.
Quantity Botanical Name Common Name Spacing Sun/Shade
TBD Holodiscus discolor Oceanspray Spacing: 4’
O.C. - shrub Sun or shade
TBD Vaccinium ovatum Evergreen
Huckleberry
Spacing: 4’
O.C. - shrub Shade or partial sun
TBD Rosa nutkana Nootka Rose Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Symphoricarpos albus Snowberry Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Mahonia aquifolium Tall Oregon Grape Spacing: 4’
O.C. - shrub Sun or shade
TBD Polystichum munitum Sword Fern Spacing: 2’
O.C. - shrub Shade or partial sun
TBD Ribes sanguineum Red Flowering
Currant
Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Rubus spectabilis Salmonberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Rubus parviflorus Thimbleberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Corylus cornuta Beaked Hazelnut Spacing: 4’
O.C. - shrub Sun to shade
TBD Pinus contorta var.
contorta Shore Pine Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Salix hookeriana Hookers Willow Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Rhamnus purshiana Cascara Spacing: 8’
O.C. - Tree Sun to shade
TBD Cornus nuttallii Pacific Dogwood Spacing: 8’
O.C. - Tree Part shade
TBD Thuja plicata Western Redcedar Spacing: 8’
O.C. - Tree Part shade to shade
TBD Pseudotsuga
menziesii Douglas-fir Spacing: 8’
O.C. - Tree Sun to part shade
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Table 3. Area C: 6 shrubs and 2 trees with a mix of at least two shrub species from the list. Native
Salal and Rose are naturalizing here.
Quantity Botanical Name Common Name Spacing Sun/Shade
TBD Holodiscus discolor Oceanspray Spacing: 4’
O.C. - shrub Sun or shade
TBD Vaccinium ovatum Evergreen
Huckleberry
Spacing: 4’
O.C. - shrub Shade or partial sun
TBD Rosa nutkana Nootka Rose Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Symphoricarpos albus Snowberry Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Mahonia aquifolium Tall Oregon Grape Spacing: 4’
O.C. - shrub Sun or shade
TBD Polystichum munitum Sword Fern Spacing: 2’
O.C. - shrub Shade or partial sun
TBD Ribes sanguineum Red Flowering
Currant
Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Rubus spectabilis Salmonberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Rubus parviflorus Thimbleberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Corylus cornuta Beaked Hazelnut Spacing: 4’
O.C. - shrub Sun to shade
TBD Pinus contorta var.
contorta Shore Pine Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Salix hookeriana Hookers Willow Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Rhamnus purshiana Cascara Spacing: 8’
O.C. - Tree Sun to shade
TBD Cornus nuttallii Pacific Dogwood Spacing: 8’
O.C. - Tree Part shade
TBD Thuja plicata Western Redcedar Spacing: 8’
O.C. - Tree Part shade to shade
TBD Pseudotsuga
menziesii Douglas-fir Spacing: 8’
O.C. - Tree Sun to part shade
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Table 4. Area D: 2 small trees would work well here. This is north of the Golden Chain tree on a
small, sloped area.
Quantity Botanical Name Common Name Spacing Sun/Shade
TBD Holodiscus discolor Oceanspray Spacing: 4’
O.C. - shrub Sun or shade
TBD Vaccinium ovatum Evergreen
Huckleberry
Spacing: 4’
O.C. - shrub Shade or partial sun
TBD Rosa nutkana Nootka Rose Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Symphoricarpos albus Snowberry Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Mahonia aquifolium Tall Oregon Grape Spacing: 4’
O.C. - shrub Sun or shade
TBD Polystichum munitum Sword Fern Spacing: 2’
O.C. - shrub Shade or partial sun
TBD Ribes sanguineum Red Flowering
Currant
Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Rubus spectabilis Salmonberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Rubus parviflorus Thimbleberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Corylus cornuta Beaked Hazelnut Spacing: 4’
O.C. - shrub Sun to shade
TBD Pinus contorta var.
contorta Shore Pine Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Salix hookeriana Hookers Willow Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Rhamnus purshiana Cascara Spacing: 8’
O.C. - Tree Sun to shade
TBD Cornus nuttallii Pacific Dogwood Spacing: 8’
O.C. - Tree Part shade
TBD Thuja plicata Western Redcedar Spacing: 8’
O.C. - Tree Part shade to shade
TBD Pseudotsuga
menziesii Douglas-fir Spacing: 8’
O.C. - Tree Sun to part shade
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Table 5. Area E*: 20 plants with a mix of at least 4 different species from the list. Native Salal and
Huckleberry in this area already.
* Area E will run parallel to the existing shed on its eastern side
Quantity Botanical Name Common Name Spacing Sun/Shade
TBD Holodiscus discolor Oceanspray Spacing: 4’
O.C. - shrub Sun or shade
TBD Vaccinium ovatum Evergreen
Huckleberry
Spacing: 4’
O.C. - shrub Shade or partial sun
TBD Rosa nutkana Nootka Rose Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Symphoricarpos albus Snowberry Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Mahonia aquifolium Tall Oregon Grape Spacing: 4’
O.C. - shrub Sun or shade
TBD Polystichum munitum Sword Fern Spacing: 2’
O.C. - shrub Shade or partial sun
TBD Ribes sanguineum Red Flowering
Currant
Spacing: 4’
O.C. - shrub Sun or partial shade
TBD Rubus spectabilis Salmonberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Rubus parviflorus Thimbleberry Spacing: 4’
O.C. - shrub Sun or shade
TBD Corylus cornuta Beaked Hazelnut Spacing: 4’
O.C. - shrub Sun to shade
TBD Pinus contorta var.
contorta Shore Pine Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Salix hookeriana Hookers Willow Spacing: 8’
O.C. - Tree Sun to partial shade
TBD Rhamnus purshiana Cascara Spacing: 8’
O.C. - Tree Sun to shade
TBD Cornus nuttallii Pacific Dogwood Spacing: 8’
O.C. - Tree Part shade
TBD Thuja plicata Western Redcedar Spacing: 8’
O.C. - Tree Part shade to shade
TBD Pseudotsuga
menziesii Douglas-fir Spacing: 8’
O.C. - Tree Sun to part shade
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7 Monitoring
7.1 As-Built Report
An as-built drawing and report will be submitted as documentation of the implementation of the
approved planting plan within one month of installation. The plan will include a
quantitative final list of species for each planting area, vegetation descriptions, and photo
documentation from established photo stations. A panoramic photo of the entire mitigation site
will also be provided. Photos should be taken between June and September, during the growing
season.
7.2 Monitoring Schedule
Monitoring will take place over a period of five years at the end of the growing season (late
August or early September) of each monitoring year. The performance standards will be
monitored by measuring plots within the planting area, which will be established and mapped
after the planting occurs. Collected data and photos will be compiled into an annual Riparian
Planting Report, which will be submitted by October 31 each monitoring year for five years.
7.3 Monitoring Methods
Each annual monitoring report shall include written and photographic documentation on plant
mortality and any replanting efforts. There will be specific locations where photos will be taken
from for each plot, and these photo points will be referenced on the as-built plan. The site will
have at least two photo points per planting area. Each year, photos will be taken at the established
photo points for each area, and these successive photos will be used for comparison over the five
years. Photos will be taken at all established photo points for all monitoring years to provide
visual documentation of the performance standards progress, or lack thereof. In addition to photos
at designated locations, photo documentation must include a panoramic view of each planting
area. Submitted photos must be formatted on standard 8.5" by 11" paper, and must include the date
the photo was taken, as well as the direction from which the photo was taken. The established
photo location points must be identified on a site drawing.
Percent cover will be measured using the point intercept method as described above in the
Performance Standards (section 4). There will be at least one transect per planting area and
transect locations will be shown on the site plan. Up to 20% of any stratum can be composed of
desirable native volunteers when measuring cover. No more than 10% cover of non-native or
other invasive species is permissible in any monitoring year. The Monitoring Report will
document whether the performance standards are being met.
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8 Maintenance
Maintenance shall occur at least twice during the growing season to ensure the survival of all
native species within the mitigation area, including volunteer natives. Watering by hand or
sprinkler may be necessary during year number one until the plants are established (see section
5.5). Water requirements will depend on the timing of planting with the seasons and weather
conditions. Once plants are established, extra watering may not be necessary. Hand weeding may
be necessary around all plants that are being monitored for survival and coverage.
If the required survival rate is not met by the end of any monitoring year, plants lost to mortality
will be replaced to achieve the percentage cover performance standard described above. Prior to
replacement, observations will be made on plants that did not survive in order to attempt to
determine whether their survival was affected by species/site selection, damage caused by
wildlife, or other factors. Subsequent contingency actions must be designed to respond directly
to any stressor(s) that are determined to have increased the mortality of planted native species. If
it is found that a particular species is not surviving well at the site, a more appropriate species
will be selected for its replacement. If excessive damage by wildlife, exposure, or other elements
is observed, protective measures may need to be introduced. Monitoring years may be added if
significant re-planting becomes necessary.
Monitoring on an annual basis for five years will occur with photographs to determine the
survival rate of the transplanted area. If 100% success is achieved before reaching the five-year
mark, monitoring will continue without extra replanting efforts.
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Attachment 1. Site Photos
Area A looking north
Area A looking south
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Area B looking west
Area B looking east
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Area C looking north
Area C looking south
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Area D looking west
Area D looking south
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Area E looking south
Area E looking north
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Attachment 2. Native Plant Sources for the Pacific Northwest
Native Plant Sources for the Pacific Northwest
This list contains those nurseries known to Permitting staff that grow plants native to the Puget lowlands of Western Washington in quantities suitable for most mitigation sites. It was extracted from a longer list compiled by the Water and Land Resources Division (WLRD) of King County for your convenience, drawing
in part on the Hortus West native plant directory and journal: Hortus West, P.O. Box 2870, Wilsonville, OR
97070. 800-704-7927. Fax: 503-570-0855. E-mail: editor@hortuswest.com. It is not an endorsement of these
businesses. The full list is available from WLRD at 206-296-6519.
Nurseries that specialize in seeds are marked (SEEDS).
Abundant Life Seed Foundation (SEEDS) Davenport Seed Corporation (SEEDS) P.O. Box 772 P.O. Box 187
Port Townsend, WA 98368 Davenport, WA 99122-0187
360-385-5660 800-828-8873
Barford's Hardy Ferns Emmery's Gardens 23622 Bothell Way 2829 - 164th Avenue SW Bothell, WA 98248 Lynnwood, WA 98037
Phone: 425-438-0205 Phone: 425-743-4555
Fax: 206-483-0205 Fax: 425-743-0609
Botanica Firetrail Nursery P.O. Box 19544 3107 - 140th Street NW
Seattle, WA 98109 Marysville, WA 98271
206-634-1370 360-652-9021
Clark's Native Trees and Shrubs Frosty Hollow Ecological Restoration (SEED)
1215 - 126th Avenue SE P.O. Box 53 Everett, WA 98208 Langley, WA 98260
206-337-3976 360-579-2332
Cold Creek Nursery Heathwood Cottage Nursery
18602 NE 165th Street 18540 - 26th Avenue NE Woodinville, WA 98072 Lake Forest Park, WA 98072 425-788-0201 206-363-3189
Colvos Creek Farm IFA Nurseries, Inc.
P.O. Box 1512 463 Eadon Road
Vashon, WA 98070 Toledo, WA 98591
206-441-1509 425-864-2803
Inside Passage (SEEDS) Sound Native Plants P.O. Box 639 P.O. Box 10155
Port Townsend, WA 98368 Olympia, WA 98502
206-781-3575 Phone: 360-352-4122
Fax: 360-943-7026
Caldwell Mitigation Planting & Monitoring Plan MSA | 22
J & J Landscape Co. Storm Lake Growers 19538 - 75th NE 21809 - 89th SE Bothell, WA 98011 Snohomish, WA 98290
360-794-4842
Judd Creek Wetland and Native Plant Nursery Sweet Briar 20929 - 111th Avenue SE P.O. Box 25 Vashon, WA 98070 Woodinville, WA 98072
206-463-2812 425-821-2222
MSK Nursery Thorsett Landscaping Nursery 20066 - 15th Avenue NW 13503 Southeast 226th Place
Seattle, WA 98177 Kent, WA 98042 206-546-1281 253-361-5838
Northfork Nursery Wabash Farms Native Plants 15751 Polson Road Ornamental and Reclamation
Mt. Vernon, WA 98273-7142 19390 SE 400th
360-445-4741 Enumclaw, WA 98022
Phone: 360-825-7051 Fax: 360-825-1949
Pacific Natives & Ornamentals Weyerhauser-Western Revegetation Greenhouse P.O. Box 23 33405 - 8th Avenue South
Bothell, WA 98041 Federal Way, WA 98003 Phone: 425-483-8108 800-732-4769
Fax: 425-487-6198
Revegetate & Resource Plants Woodbrook Native Plant Nursery
17836 Cedar Grove Road 5919 78th Ave NW
Maple Valley, WA 98038 Gig Harbor, WA 98335
425-432-9018 253-857-6808, woodbrk@harbornet.com
Sourced from the King County Critical Areas Restoration and Enhancement document, Appendix A 2020