HomeMy WebLinkAbout50- UPLAND RESTORATION MEMOWET.LAND, LLC 8201 164TH AVE NE, SUITE 200, PMB 141, REDMOND, WA, 98052 206-309-8100
Upland Restoration Memo
To: Ann Burkhart
From: Jennifer Marriott
Date: 22 July 2022
Property: Pomona Woods
The County approved a small driveway/access stub that was constructed prior to establishing the final
driveway alignment. Since the driveway alignment has since been adjusted to avoid impacts to a wetland
buffer, the portions of this driveway stub that are outside of the new driveway will be restored as native,
upland forest. The upland restoration proposed will occur outside of all critical areas. This memo summarizes
the proposed voluntary upland restoration actions.
Agency Policies and Guidance
The proposed restoration plan was designed in accordance with the policies and guidance provided in the
following documents - Jefferson County Code (JCC) Chapter 18.22 Critical Areas. No other agencies have
jurisdiction over the upland restoration area.
Proposed Restoration Components
The mitigation plan includes the restoration of 1,978 square feet of uplands located outside of any designated
critical areas.
A planting plan is provided in Figure 1. The project proposes to plant 80 shrubs. The plants will be sourced from
onsite from within the proposed project area. Plants will be relocated onsite. Topsoil and mulch will also be
sourced from onsite from within the proposed disturbance areas of the Project. Planting specifications for the
voluntary upland restoration plan are provided as Figure 2.
Proposed upland restoration measures include:
1.Removing gravel;
2.Decompacting soils, scarify and amend with topsoil or compost;
3.Adding soil amendments, as determined necessary;
4.Installing a minimum of 3 inches of bark mulch in all bare soil areas; and
5.Planting a variety of native deciduous shrub species (Table 1).
Plantings will be watered by hand as needed to ensure successful establishment.
Exhibit 50
Exhibit 50 Page 0737
PAGE 2
Table 1. Upland Restoration Plant Schedule
Scientific
Name Common Name WIS Quantity Spacing Size (Min) Notes
Corylus cornuta Beaked hazelnut FACU 20 6' O.C. 24" Ht Full & bushy
Oemleria
cerasiformis Oso-berry FACU 30 6' O.C. 24" Ht Full & bushy
Ribes
sanguineum
Red flowering
currant FACU 30 6' O.C. 1 gal. Full & bushy
Maintenance Plan and Contingency Measures
A minimum of three (3) maintenance reviews will be performed within the first year following plant installation to
identify any conditions that could jeopardize the successful establishment of the restoration plantings.
The following list includes examples of maintenance (M) actions that may be implemented during the course of the
maintenance period. This list is not intended to be exhaustive, and other actions may be implemented as deemed
necessary.
• Replace all dead woody plant material during Year One (M).
• Remove/control weedy or exotic invasive plants in a manner consistent with current Agency guidelines and
recommendations. Use of herbicides or pesticides within the restoration area would only be implemented if
other measures failed or were considered unlikely to be successful. All non-native vegetation must be
removed and disposed of off-site (M).
• Weed all shrubs to the dripline and provide 3-inch deep mulch rings 24 inches in diameter for shrubs and 36
inches in diameter for trees (M).
• Remove trash and other debris from the restoration area twice a year (M).
• Selectively prune woody plants at the direction of Project Ecologist or Biologist to meet the restoration plan
goal of successful establishment (e.g., thinning and removal of dead or diseased portions of trees/shrubs)
(M).
If, during the course of the one-year maintenance period post plant installation, there appears to be a significant
problem with achieving the desired goal of successful establishment of all installed plants, the permittee shall
develop a Contingency Plan in order to get the restoration area back into compliance with the desired goal.
Contingency plans can include, but are not limited to, the following actions: additional plant installation, erosion
control, bank stabilization, modifications to hydrology, and plant substitutions of type, size, quantity, and/or
location. No coordination with the County will be completed for this voluntary restoration work as all work will be
done outside of regulated critical areas.
The following list includes examples of contingency (C) actions that may be implemented during the course of the
monitoring period. This list is not intended to be exhaustive, and other actions may be implemented as deemed
necessary.
Exhibit 50 Page 0738
PAGE 3
• Replace dead plants with the same species or a substitute that meets restoration plan goals, subject to
project Biologist/Ecologist and agency approval (C).
• Re-plant area after reason for failure has been identified (e.g., moisture regime, poor plant stock, disease,
shade/sun conditions, wildlife damage, etc.) (C).
Summary
Voluntary upland restoration is proposed for the County-approved access road along Oak Bay Road where this road
occurs outside of the currently proposed driveway alignment. A total of 1,978 square feet will be planted with native
deciduous species sourced from the proposed disturbance areas onsite. This will be a one-time planting that will
be monitored to ensure plant survival past the one-year mark, consistent with nursery-purchased plant material.
Attachments:
Figure 1. Existing Conditions & Restoration Plan
Figure 2. Restoration Planting Specifications
Exhibit 50 Page 0739
Pomona WoodsVoluntary Upland Restoration PlanOak Bay Road, Jefferson County, WashingtonSOURCE: ESRI TOPOGRAPHY AND HILLSHADE
EXISTING CONDITIONS & RESTORATION PLANREVISIONS
DATE/DESCRIPTION
(206) 309 - 8100FIGURE 1
JOB NUMBER:
DESIGNED BY:
DRAWN BY:
CHECKED BY:
DATE:
#0084
JMM
KAN
JMM
07/18/2022
VOLUNTARY UPLAND RESTORATION PLAN
SEE INSET MAP
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UPLAND RESTORATION PLANT SCHEDULE
Scientific Name Common Name WIS Quantity Spacing Size (Min) Notes
Corylus cornuta Beaked hazelnut FACU 20 6' O.C. 24" Ht Full & bushy
Gaultheria shallon Salal FACU 30 6' O.C. 1 gal. Full & bushy
Oemleria cerasiformis Oso-berry FACU 30 6' O.C. 24" Ht Full & bushy
0 5 10 152.5
Feet
SCALE: 1" = 5'
Pomona Woods
Proposed Project
Gravel Access Road
Upland Restoration
( 1,978 sf)
Wetlands
Off-site
On-site
Wetland Buffer
High Impact Buffer
Moderate Impact Buffer
Low Impact Buffer
Stream Buffer
Stream
LEGEND
Exhibit 50 Page 0740
Pomona WoodsVoluntary Upland Restoration PlanOak Bay Road, Jefferson County, WashingtonRESTORATION SPECIFICATIONSREVISIONS
DATE/DESCRIPTION
(206) 309 - 8100FIGURE 2
JOB NUMBER:
DESIGNED BY:
DRAWN BY:
CHECKED BY:
DATE:
#0084
JMM
KAN
JMM
07/18/2022
RESTORATION SPECIFICATIONS
1. GENERAL
1.1. Sequencing
1.1.1. General Construction
1.1.1.1. Contractor shall give the project biologist or ecologist a minimum of
ten (10) days notice prior to beginning of construction.
1.1.1.2. No construction work shall commence until there is a meeting
between the client; the project biologist or ecologist; general, clearing,
and/or earthwork contractors; and the landscape contractor. The
approved plans and specifications shall be reviewed to ensure that all
parties involved understand the intent and the specific details related
to the construction documents, specifications, and site constraints.
1.1.1.3. Locations of existing utilities have been established by field survey or
obtained from available records and should be considered
approximate only and not necessarily complete. It is the sole
responsibility of the contractor to: (1) independently verify the
accuracy of utility locations and (2) discover and avoid any utilities
within the mitigation plan area(s) that are not shown, but which may
be affected by implementation of the plan. Such area(s) are to be
clearly marked in the field. The project biologist or ecologist shall
review any conflicts with the approved grading plan prior to start of
construction.
1.1.1.4. A copy of the approved plans must be on-site whenever construction is
in progress, and shall remain on-site until project completion.
1.1.1.5. Construction must be performed in accordance with all agency
standards, rules, codes, permit conditions, and/or other applicable
ordinances and policies.
1.1.1.6. The project owner/applicant is responsible for obtaining any other
related or required permits prior to the start of construction.
1.1.1.7. A qualified wetland consultant shall be on-site, as necessary, to
monitor construction and approve minor revisions to the plan, to be
included in as-built drawings.
1.1.1.8. During construction, the contractor must use materials and
construction methods that prevent toxic substances and other
pollutants from entering mitigation areas or other natural waters of
the state.
1.1.1.9. Preventative measures shall be used to protect existing storm drainage
systems, existing utilities, and roads.
1.1.1.10. The contractor shall provide sediment and erosion controls
around the project area prior to soil disturbance from construction
activity.
1.1.2. Restoration Construction: The following provides the general sequence of
activities anticipated to be necessary to complete this restoration project.
Some of these activities may be conducted concurrently as the project
progresses.
1.1.2.1. Conduct a site meeting between the contractor; the project biologist or
ecologist; and the owner’s representative to review the project plans,
work areas, staging/stockpile areas, material disposal areas, and
existing vegetation to be retained.
1.1.2.2. Remove gravel from upland restoration area.
1.1.2.3. Ensure a minimum of 12 inches of topsoil prior to plant installation.
Topsoil to be sourced from disturbed areas onsite.
1.1.2.4. Plant shrubs and ferns as indicated on mitigation plans. Plant material
to be sourced from disturbed areas onsite.
1.1.2.5. Install at least 3 inches of mulch. Mulch to be sourced from the
disturbed areas onsite.
1.2. Quality Assurance
1.2.1. Plant Material: All plant materials shall be sourced from the Site and relocated
from within the proposed disturbance areas and relocated into the restoration
area.
1.3. Inspection, Storage and Handling
1.3.1. Protection: Plant material shall be protected during delivery to prevent
desiccation and damage to the branches, trunk, root system, or earth ball.
Branches shall be protected by tying-in. Exposed branches shall be covered
during transport.
1.3.2. Fertilizer: Fertilizer shall be delivered in manufacturer’s standard sized bags
showing weight, analysis, and manufacturer’s name. Store under a waterproof
cover or in a dry place as designed by the owner’s representative.
1.3.3. Inspection: All plant materials shall be inspected upon arrival at the job site by
the owner’s representative for conformity to type and quantity with regard to
their respective specifications.
1.3.4. Mulch: A mulch sample shall be inspected by the project biologist or ecologist
prior to the mulch being delivered to the site.
1.3.5. Storage:
1.3.5.1. Plant material not installed on the day of arrival at the site shall be
stored and protected in designated areas. Plants stored on the project
site shall be protected from extreme weather conditions by insulating
the roots, root balls or contains with sawdust, soil, compost, bark or
woodchips. Plant material shall be protected from direct exposure to
wind and sun. Bare-root plant material shall be heeled-in. Cuttings and
emergent plants must be protected from drying at all times and shall
be heeled-in with moist soil or other insulating material. All plant
material stored on-site shall be watered daily until installed.
1.3.5.2. Storage of other materials shall be in designated areas.
1.4. Scheduling
1.4.1. Planting Season: Install woody plants between October 1 and February 15
whenever the temperature is above 32 degrees F and the soil is in a workable
condition, unless otherwise approved in writing.
1.4.2. Plant Installation: Except for container-grown plant material, the maximum
time between the digging and installation of plant material shall be 21 days.
The maximum time between plant installation and mulch placement shall be
72 hours.
1.5. Warranty
1.5.1. Plant material will not have a warranty as it will be sourced from the proposed
disturbance areas onsite. If any plants die before the one-year period, they will
be replaced either from relocation from onsite or purchased from a local
nursery.
2. PRODUCTS AND MATERIALS
2.1. Plants
2.1.1. General: All plant material will conform to the varieties specified or shown in
the plant list(s) indicated on the mitigation plants and be true to botanical
name as listed in: Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific
Northwest. University of Washington Press.
2.1.2. Shrubs:
2.1.2.1. Plant materials shall be locally grown (western Washington, western
Oregon, or western BC), healthy, bushy, in vigorous growing condition,
and guaranteed to be true to size, name, and variety. If replacement of
plant material is necessary due to construction damage or plant failure
within one year of installation, the sizes, species, and quantities shall
be equal to specified plants, as indicated on the plans.
2.1.2.2. Plants shall be well-rooted, or normal growth and character, and free
from disease or infestation. The project biologist or ecologist reserves
the right to require replacement of substitution of any plants deemed
unsuitable.
2.1.2.3. Shrubs shall have a minimum of three stems and shall be a minimum
height of 18 inches.
2.1.2.4. Shrubs shall have developed root and branch systems. Do not prune
branches before delivery.
2.1.2.5. Plants shall be free of splits and checks, bark abrasions, and disfiguring
knots.
2.1.2.6. For deciduous plants, buds shall be intact and reasonably closed at
time of planting, if dormant.
2.1.2.7. Plants shall conform to sizes indicated on the plant schedule. Plants
may be larger than the minimum sizes specified.
2.1.3. Noxious Species: All plant stock and other re-vegetation materials shall be free
from the seed or other plant components of any noxious or invasive species, as
identified by the King County Noxious Weed Control Board.
2.1.4. Substitutions: Substitutions will not be permitted without a written request
and approval from the owner’s representative, the project biologist or
ecologist, and applicable agencies.
2.2. Planting Soil
2.2.1. Topsoil: If suitable stockpiled native topsoil is not available for mitigation
plantings, topsoil shall be obtained from outside sources. Stockpiled or
imported topsoil shall be fertile, friable, sandy loam surface soil, free of
subsoil, clay lumps, brush, weeds, roots, stumps, stones larger than 1 inch in
any direction, litter, or anyother extraneous or toxic matter harmful to plant
growth.
2.2.2. Organic Content: Imported topsoil shall consist of organic materials amended
as necessary to produce a bulk organic content of at least 10 percent and not
greater than 20 percent, as determined by AASHTO-T-194.
2.2.3. Compost: Compost shall meet the definition for composted materials as
defined by the Washington State Department of Ecology.
2.3. Mulch
2.3.1. Bark or woodchip mulch shall derived from Douglas fir, pine, or hemlock
species. The mulch shall not contain resin, tannin, or other compounds in
quantities that would be detrimental to animal, plant life, or water quality.
Sawdust shall not be as mulch.
2.3.2. Mulch shall be medium-coarse ground with an approximately 3-inch minus
particle size. Fine particles shall be minimized so that not more than 30
percent, by loose volume, will pass through a US No. 4 sieve.
3. EXECUTION
3.1. Soil Preparation
3.1.1. Planting Area Conditions: Contractor shall verify that plant installation
conditions are suitable within the project area(s). Any unsatisfactory
conditions shall be corrected prior to start of work. When conditions
detrimental to plant growth are encountered, such as rubble fill, poor
drainage, compacted soils, significant existing or invasive vegetation, or other
obstructions, contractor shall notify the project biologist or ecologist prior to
planting. The beginning of work by the contractor constitutes acceptance of
conditions as satisfactory.
3.1.2. Planting in Graded Areas: In graded planting areas, plants shall be installed in
newly placed topsoil.
3.1.3. Soil Decompaction/Scarification: Soils in graded/disturbed areas that are
compacted and unsuitable for proper plant growth shall be decompacted
and/or scarified to a minimum depth of 6 inches prior to topsoil installation.
3.2. Planting
3.2.1. Plant Layout: Proposed locations of shrubs shall be staked and identified
within an approved coding system or by placement of the actual plant
material. For large groupings of a single species of shrub, landscape contractor
may stake the planting boundaries.
3.2.2. Obtain layout approved from the project biologist or ecologist prior to
excavation of planting pits.
3.2.3. Plant Pit Dimensions:
3.2.3.1. Pit Depth: Not to exceed the root ball or container depth.
3.2.3.2. Pit Width: Measured at the ground surface, 2 times the width of the
root ball or container, as indicated in typical planting details. For bare-
root plants, diameter equal to the width of the root spread.
3.2.4. Setting Plants:
3.2.4.1. Shrub Planting: Shrub stock shall be planted in hand-dug holes
according to planting details shown on the mitigation plans. Shrub
root balls shall be set so that roots collars are 1 inch above adjacent
grade. All backfill shall be gently tamped in place.
3.2.4.2. Surface Finish: Form a saucer as indicated on typical planting details,
or as directed. Grade soil to form a basin on the lower side of slope
plantings to catch and retain water.
3.2.4.3. Actual plant symbol quantities shown on the plants shall prevail over
quantities shown on the plant schedule in the event of a discrepancy.
3.2.5. Mulching:
3.2.5.1. Non-Graded Buffer Areas: Provide a 36-inch diameter, 3-inch deep
mulch ring around the base of each tree, and a 24-inch diameter, 3-
inch deep mulch ring around the base of each shrub.
3.2.5.2. Water plants thoroughly after mulching.
3.2.6. Pruning: Prune immediately after planting only as directed by the project
biologist or ecologist.
3.2.7. Restore Existing Natural or Landscaped Areas:
3.2.7.1. Existing natural or landscapes areas that are damaged during
construction shall be restored to their original condition, unless
improvements or modifications are specified for those areas.
3.2.7.2. Contractor shall exercise care to prevent injury to the trunk, roots, or
branches of any trees or shrubs that are to remain. Any living woody
plant that is damaged during construction shall be treated within 24
hours of occurrence, and the project biologist or ecologist shall be
notified immediately of the incident. Damage treatment shall include
evenly cutting broken branches, broken roots, and damaged tree bark.
Injured plants shall be thoroughly watered and additional measures
shall be taken, as appropriate, to aid in plant survival.
3.2.8. Final Inspection and Approval: The contractor shall notify the project biologist
or ecologist in writing at least ten days prior to the requested date pf a project
completion inspection. If items are to be corrected, a punch list shall be
prepared by the project biologist or ecologist and submitted to the contractor
for completion. After punch list items have been completed, the project
biologist or ecologist shall review the project again for final acceptance of plan
implementation. If punch list items require plant replacement, and the
inspection occurs outside of a suitable planting season, plants shall be
replaced during the next planting season.
3.2.9. As-Built Plan: Contractor is responsible for verifying plant locations and
quantities on the plant schedule with those represented as symbols on the
mitigation plans. Contractor shall keep a complete set of prints at the job site
during construction for the purpose of recording in-the-field changes or
modifications to the approved plans. This information shall be updated on a
daily basis as necessary.
Exhibit 50 Page 0741