HomeMy WebLinkAboutWetland Mitigation 950100909
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Mitigation and Wetland Buffer Enhancement Plan
Parcels # 950 100 905 (~E), 950 100907,950 100908, 950 100909,
950 100910,950 100913
April 2007
Prepared for:
Harriette Buckmann
21052ndAvenue
Port Angeles, WA, 98362
dixiellewell in@yahoo.com
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Harriette Buckmann
Mitigation and Wetland Buffer Enhancement Plan
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Parcels # 950 100905 (1/2 E), 950 100907,950 100908,950 100909,
950 100910,950 100913
April 2007
Contents
Introduction
Project Proposal
Mitigation Plan
Mitigation Measures
Best Management Practices (BMP's)
Revegetation Plan
Installation
Maintenance and Weed Control
Seeding to Stabilize Soils
Irrigation
Monitoring Plan
Monitoring Methodology
Monitoring Schedule
Project Goals and Objectives
Performance Standards
Contingency Plans
Summary
Appendix
Sheet #1 ADA Engineering LLC Survey Map
Sheet #2 Enhancement and Revegetation Plan
Plant List and Landscape Specification
Installation Specifications and Recommendations With Seed Mix
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Harriette Buckmann t ~Jo~ ~.;;'Iif,
Mitigation and Wetland Buffer Enhancement Plan
Parcels # 950 100905 (1/2 E), 950 100907,950 100908,950 100909,
950 100910,950 100913
April 2007
Introduction
A Category II wetland was delineated on June 2006 to determine the feasibility of one building envelope
within the subject parcels. Since the only feasible building site would be within the wetland buffer a
preliminary mitigation plan was developed (Wetland Delineation Report and Mitigation Plan, Olympic
Wetland Resources, Inc). These parcels were then surveyed on March 2007 and the exact parcel size and
location of the wetland edge was determined by ADA Engineering LLC. The entire combined parcel size
is 39,070 sq. ft. (.9 acre). The proposed building site is 1,444 sq. ft. and is located at the corner of Ferry
Street and South Beach Drive across the street from existing waterfront homes along Hood Canal. The
final survey map by ADA Engineering is included in the Appendix (Sheet # 1).
Project Proposal
This mitigation plan is prepared for a potential buyer to be submitted with a building permit for a single-
family residence. It will be the responsibility of the future buyer to complete the mitigation plan as
outlined below.
The majority of the subject parcels are within a wetland or wetland buffer. There are no feasible
alternatives for a homesite outside of wetland buffers, therefore these buffers will need to be reduced from
100 feet (buffer size on parcel is 2,400 sq. ft., which does not include roadways) to 10 feet (1,000 sq. ft.).
There will be no impacts to the wetland if the mitigation and revegetation plan is conducted as outlined in'
this report.
Although water and sewer are provided off-site, a septic tank will need to be installed within the 10 foot
buffer along South Beach Drive. This will cause temporary impacts within an area 10 X10 feet (100 sq.
ft.). This area will be revegetated with native grasses.
Mitigation Plan
Mitigation requirements have been prepared to meet the standards outlined in the Departlp~c,r!Ecology,
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Guidance on Wetland Mitigation in the State of Washington State (April 2004): This mItigation plan
summarizes functions and values of the existing wetland system, vegetation,fot restorati~~,.m~ntenance
and monitoring schedules, and performance standards. '
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Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
1
Olympic Wetland Resources, Inc,
April 2007
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Mitigation Measures f -! c.j.~-#--:.~ iff
. Combining Lots Creating one building lot from Lots 4 (E Y2), 5, 6 (two parcels), 7 and Lots 12
and 13 within the total area of 39,070 sq. ft. (.9 acres).
. Buffer Enhancement The buffer will be reduced from 2,400 sq. ft. to 1,000 sq. ft. to
accommodate a building envelope which will be 1,444 sq. ft. The entire reduced buffer will be
enhanced with dense plantings of native trees(20) and shrubs (70) and herbaceous grasses and
sedges.
. Preserving Open Space The area outside the specified building envelope and reduced buffer will
remain in open space. Of the 39,070 sq. ft. (.9 acres) 36,967 sq. ft. (.85 acre) will be preserved to
retain the original function and values of the wetland.
. Design Considerations Design considerations will include; a reduced footprint for the house
(two stories), single car garage, careful placement of the driveway, and reduction of other
impervious surfaces. Any low impact development techniques should be incorporated with the
site plan and building design.
. Fencing The construction area will be marked with temporary orange barrier fencing. A
permanent split rail fence will be installed along the wetland buffer boundary as indicated on The
Enhancement and Revegetation Plan (Sheet #2).
. Monitoring This project will require 5 years of monitoring after the residential construction and
revegetation project are complete. This will ensure that the performance standards for this
mitigation plan are met.
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Best Management Practices (BMP's)
These Conservation Practices will be implemented at all times during and after construction.
1. Avoid or control soil loss and protect water quality from degradation caused by nutrients,
animal waste, toxins, and sediment; and
2. Avoid or minimize adverse impacts to surface water and ground water flow, and circulation
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'=:3 3 . Avoid or control the movement of sediment and erosion control caused by land alteration
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~ activities. It is recommended that the project to be conducted during dry weather to minimize
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~ 4. Avoid or minimize adverse impacts to the chemical, physical, and biological characteristics of
~ critical areas; and
'.B 5. No fertilizers, pesticides, or other lawn chemicals will be applied to the yard or adjacent buffer
~ vegetation.
~ BMP's are those practices as defined by the Jefferson County, State of Washington Department of
Agriculture, State of Washington Department of Ecology, State of Washington Department ofFish
and Wildlife, conservation district, and other professional organizations.
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Revegetation Plan
The building site and wetland buffers have been disturbed by previous land use activities and consist of
non-native grasses and weedy species. Through this enhancement plan the function of the buffer will be
improved. Final location of recommended plant species should be determined when construction is
complete. Recommendations for plant locations are included in the Appendix (Sheet #2, Enhancement
and Revegetation Plan). A plant list is included in the Appendix.
Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
2
Olympic Wetland Resources, Inc.
April 2007
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e p an mc u es a 1St 0 native speCIes t at wou e appropnate lor t IS wet coasta SIte. 01 s WI
need to be amended with imported soils and compost for the success of planted species. Species in the
plan are mostly water tolerant and are chosen to withstand the shallow water table present at this site.
Species recommended within the wetland herbaceous layer are Lyngby's sedge, wild rye, and seacoast
bulrush. These should be densely planted once the septic tank is installed. Within the tree layer both
shore pine and quaking aspen have been chosen due to high success rates on shoreline restorations. The
shrub layer will consist of hazelnut, twinberry, willow, and red-osier dogwood. Red-flowering currant
will need to be planted upland and closer to the building site. A total of 300 grasses and sedges, 20 trees,
and over 70 shrubs are included in this enhancement plan.
Installation
All plant material sHould come from healthy plants grown in containers as specified. It is
desirable to obtain plants that are adapted to this region and propagated in local nurseries.
For this project native species should be planted in dense grouping. In general, trees should be
planted 6 to 8 feet apart and shrubs 3 to 5 feet apart, herbaceous species 6"to 8" apart. Native
plant design encourages grouping of species in clusters to mimic the natural surroundings, rather
than in rows or grids. Installing mulch circles (bark, wood chips, compost) to 3" deep and a
minimum of 3 feet in diameter around each tree and shrub is recommended. Mulch circles help
woody specimens to become established by preserving moisture and reducing competition for
nutrients from grasses. Success rates of a restoration project are greatly improved when
commercial tree protectors are used on newly planted trees and shrubs. With this added
protection mortality is reduced during weeding and deer grazing.
Maintenance and Weed Control
The use of appropriate native species ensures that ongoing maintenance is minimized once the
plants are established. All new plantings must become established to successfully out-compete
aggressive non-native species. In past mitigation projects for this site red alders dominated the
planted species. Alders should be controlled to allow the native trees and shrubs to become
established. All invasive non-native plants should be controlled or removed. It is critical that the
Himalayan blackberries, Scot's broom, and poison hemlock are controlled; they can easily out
_ compete and cover planted species in one season.
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.~ll areas of exposed soils along the project route will be re-seeded with the seed mix. The seed
~ix should be spread after the final grading from the construction is complete and all trees and
~hrubs are planted and mulched. Seed mix recommendations are included in the Appendix under
:..Bhe Installation Specification and Recommendations.
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-Irrigation
In past mitigation projects near this site hydrology was present year-round and irrigation did not
seem to be required. If the planted species appear to be stressed in the summer months they must
be irrigated. Trees and shrubs require a minimum of 1 inch of water per week or 2 inches every
two weeks from July thorough September.
Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
3
Olympic Wetland Resources, Inc.
April 2007
Monitoring Plan
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Monitoring Methodology
A monitoring form will be used to determine plant survivorship, species density, and general condition of
planted species. This information will determine whether plant survivorship and percent cover provided
are sufficient to meet the performance standards.
Elements in the monitoring forms should include:
. plant names (common and scientific), type (tree, shrub) and numbers planted at each site;
. general condition of planted species (alive, stressed, dead);
. percent survival of trees and shrubs;
. species to be replaced;
. contribution of volunteer species;
. estimate of "desirable" plant species cover and "non desirable" plant species cover, and;
. appearance and approximate location of non-native invasive species, which include
Himalayan blackberries, reed canarygrass, Scot's broom and Canadian thistle.
Permanent photopoints will be established to document the changes of the vegetation layer over time.
Over the course of the 5-year monitoring program, the growth and development of the plant communities
should be discernible in the series of photographs. Photographs from all photopoints will be included in
the annual reports.
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Monitoring Schedule
Monitoring will be conducted by a professional wetland biologist. The monitoring program is to begin
after the final planting is complete to ensure that healthy stock is installed. Monitoring will be conducted
during the growing season in late June or early July and continue for 5 years.
Summary reports will be prepared annually and submitted to the Jefferson County Department of
Community Development. The reports will consist of a general description and condition of the planted
areas. Counts will be made of all species that need to be replaced and the location of undesirable weed
infestations will be recorded.
A sample Monitoring and Maintenance Schedule is outlined below.
M 't' d M . t S h d I
Onl onng an am enance c e ue
Fall Spring Fall Spring Fall Spring Fall Spring Fall Spring Fall
Maintenance
Planting
Maintenance * X X X X X
Irrigation * X X X
Replace plants as needed X X X X
Monitoring
Vegetation and Habitat X X X X X
Photopoint X X X X X
Annual Report X X X X X
*lrrigation May through September; Weeding twice a year
Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
4
Olympic Wetland Resources, Inc.
April 2007
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Project Goals and Objectives
The goals and objectives for this project are as follows:
HrR :. ,~ 2007
. to avoid all impacts to the wetland
. to reduced buffer from 100 feet to 10 feet and revegetate with dense native wetland and
upland vegetation;
. to increase diversity of plant species with appropriate native trees and shrubs;
. to enhance the habitat for resident and migratory wildlife;
. to provide protective measures during the construction process to minimize impacts to
wetlands or buffers (BMP's during and after construction);
. to remove and control non-indigenous plant species within the mitigation areas;
. to guarantee the success of the project through maintenance and irrigation of planted
species as needed; and
. to document the success of the project through monitoring (annual monitoring reports for 5
years).
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Performance Standards
Monitoring will determine whether the performance standards identified in this mitigation plan are met.
The proposed length of time for mitigation compliance is five years. This time period will allow for the
planted and volunteer species to become established. Enhancement will be considered successful if the
buffer plantings meet the following criteria:
. Survivorship of tree and shrub species is expected to be 100% after the first growing season. All
plants that do not survive the first year should be replanted.
. The wetland buffer mitigation will be considered successful if 80% or greater of desirable cover is
achieved and the plants are healthy and vigorous. Desirable species include volunteer native trees
and shrubs (Nootka rose) and native and non-native pasture grasses.
. No more than 15% invasive species should be present at any time during the monitoring process.
Non-desirable species include Scots' broom, reed canarygrass, poison hemlock, thistle, (both
Canadian and bull), and Himalayan blackberry.
Contingency Plans
The purpose of the contingency plan is to evaluate available alternatives if monitoring indicates that the
project goal and objectives have not been achieved. Contingency plans will vary depending upon which
goals have not been met and will apply to each specific mitigation activity. Appropriate corrective action
will be recommended after the first year of the monitoring process and will include the following:
. replanting of any dead vegetation in the first year and additional replanting if density goals are not
met over the following four years;
. increased maintenance, which may include additional watering and/or weeding;
. additional protection to established buffers to compensate for the length of completion of mitigation
if the density goals are not being met.
Summary
A highly impacted Category II wetland was delineated for Harriette Buckmann by Olympic Wetland
Resources, Inc. and surveyed by ADA Engineering. A potential building site (1,444 sq. ft.) has been
established within 7 parcels (39,070 sq. ft). Since there are no other feasible alternatives, buffers and
Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
5
Olympic Wetland Resources, Inc.
April 2007
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street right-of-ways will need to be reduced. Additional temporary buffer impacts of approximately 100
sq. ft. will occur during the installation of a septic tank for the off site sewer.
Mitigation measures to compensate for buffer reduction include: combining 7 lots (.9 acres) to create one
feasible building site with the remaining .85 acres preserved as open space. Additional mitigation
measures include practicing BMP's at all times during construction or septic tank installation, and using
low impact development concepts and techniques. After the final construction and grading are complete a
revegetation plan will be implemented followed by 5 years of monitoring. As outlined in the plan a
permanent split rail fence will be installed and native trees, shrubs, and wetland tolerant herbaceous
species will be densely planted within the remaining 10 foot buffer. This mitigation plan should be
submitted when the applicant applies for a building permit.
Through this enhancement plan existing functions and values of the wetland will be retained. If this
mitigation plan is implemented as outlined, all wetland impacts will be avoided and over time overall
functions and values of the wetland buffer will be increased.
The final authority over this wetland determination and mitigation plan rests with the Jefferson County
Hearings Examiner and Jefferson County Department of Community Development. If there are further
questions or planning requirements for this project please do not hesitate to call.
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Dixie Llewellin
Principal Biologist, Olympic Wetland Resources, Inc.
Certified for Wetland Delineation, 1987 Manual
Wetland Training Institute, June 1995
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Buckmann Mitigation and Wetland Buffer Plan
Report File Number 2007-0605
6
Olympic Wetland Resources, Inc.
April 2007
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;\.ppendix'
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Sheet #1 ADA Engineering LLC Survey Map
Sheet #2 Enhancement and Revegetation Plan
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Plant List and Landscape Specification .
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Installation Specifications and Recommendations With Seed Mix
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Harriette Buckman
2105 2nd Avenue
Port Angeles, WA 98362
Scale: Sheet
A Indicated
Dote: # 1
April 2007
Olympic Wetland Resources, Int
856 50th Street
Port Townsend, WA 98368 aient:
360 385-6432
ADA Engineering Survey Map
South Beach Drive
Job#:
2007-0605
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BASIS OF MERIDIAN /
WITH BRASS PIN l' DEEP (OCT. 2006) AT
Of PEABOOY WAY AND WESTERlY RIGHT-OF-WAY /
ROllO (STATE HIGHWAY NO. 9E).
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DESCRIPTIO
A PORTION OF G
NORTH. RANGE 1
WASHINGTON: FU'
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TAX LOT 950100
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TAX lOT 950100
VOLUME 3. PAGE
TAX LOr 950100
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Enhancement and Revegetation Plan 1;'=20'
South Bea~h Dri~ _ _ I Ilo1eAprlI 2007 I #2
Harriette Buckmann L
2105 2nd Avenue IJOb#2007_0605
Port Angeles, WA 98362 .
Olympi( Wetland Resour(es, Int
856 50th Street I 01
Port Townsend, WA 98368 (Ii~nt:
360 385-6432
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Parcels
950100908,950100909(Lot6)
~ 950100910 (Lot 7)
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Road Setback
Reduced to
10 feet
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[J Aspen (10)
$ Shore Pine (10)
, Red osier dogwood (30)
i t Hazelnut (10)
I 'Twinberry (10)
i 'Red Flowering Currant (20)
L:yngbY'S sedge, Wild rye and
Seacoast bulrush will be planted
in wet areas
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Buckmann Wetland Plant List and Landscape Specifications
Carex lyngbyei 6" 6" 100
Le mus mol/is 6" 6" 100
Scir us maritimus 6" 6" 100
Total 300
Quaking aspen 10' 10
Shore pine 10' 10
Total 20
Cor ius cornuta Hazelnut 2gal 4' 10
Lonicera involucrata Twinbe 2gal 4' 10
Ribes sanguineum Red-flowering curran 1-2gal 4' 20
Cornus stolonifera Red-osier dogwood 2gal 5' 30
Total 70
Total Plants 390
Legend
Scientific and common names: Scientific name according to Hitchcock and Conquist (1976) Flora of the Pacific Northwest
Location: Plant location on site, also refer to planting plan for clarification.
Size: As typically planted for restoration projects.
Spacing: Recommended spacings.
Quantity: Total number of plants for project.
Native Plant Nurseries
Fourth Corner Nurseries, 3057 E. Bakerview Road Bellingham W A 98226 (360) 734-0079
Shore Road Nursery, 616 Shore Road Port Angeles, W A 98362 (360) 457-8482
Sound Native Plants, P.O. Box 7505, Olympia, W A 98507 (360) 943-7026
Woodbrook Nursery, 1620 59th Ave. Gig Harbor W A 98335 (206) 265-6271
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Installation Specifications and Recommendations
Fall Installation
Planting should be installed between mid-September and mid-November, unless the new
plantings can be watered throughout the summer. Plantings installed in the fall generally
outperform those installed in the late winter or spring. Plants put in the ground in the fall
have the advantage of an extended period for root growth before rapid top growth in the
spring. In the fall, the soil is warmer and more aerated than in the spring and most plants
experience active root growth during this time.
The cool, cloudy days and frequent precipitation of fall and winter also provide ideal
transplanting conditions. Until sufficient root systems develop, newly installed plants will
undergo transplanting stress that can be exacerbated by hot sunny days. Fall and winter
weather allows for reduced transpiration and provides ample moisture for the roots while
the plant recovers from transplant shock.
Root Disturbance
Immediately before installation plants with broken, damaged, or twisted roots
must be pruned. Matted or circling roots of containerized plantings must be
pruned or straightened and the sides of the root ball must be roughened from top
to bottom to a depth of approximately half an inch in two to four places.
If circling roots are left, they may eventually girdle the plant as they grow and
thicken in place. If the roots at the edge of the root ball are straightened and
extended, they will have access to a greater volume of soil in the planting hole.
Also, the roughened edges of the root ball will have better contact with the
backfill soil.
Disturbing and removing one-fourth to one-half of the roots in the outer inch of
the root ball will damage only the most sensitive plants; most often, this treatment
actually stimulates increased plant growth.
Plant Depth
The finished height of each plant's root ball will be slightly higher than that of the
surrounding soil. The exception is for sandy soils, in which case the soil heights
will be even. The top of the root ball will not be covered with backfill soil. A
watering basin will be formed around each planting by building a berm of soil at
least 30 inches in diameter.
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When planting a container-grown plant, the top of the root ball should not be ~
covered with any other soil. Covering the root ball with soil, particularly if it has a rr ~
finer texture than the potting or field-growing soil, will generally cause water to Cl:
flow around the root ball instead of into it; root balls covered in this way may
receive water only from below. To allow direct wetting of the root ball from
above, install the plant so that the top of the nursery soil is slightly higher than the
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surrounding soil level. If the soil is sandy, or of a large particle size, then the
nursery soil should be level with the surrounding soil.
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A watering basin made of mounded soil around each planting will further help to
catch water from above-the berm should be at least 30 inches in diameter
surrounding a plant. Mulch placed within the basin and on the berm will limit
moisture loss from the root ball and surrounding soil, but take care that it does not
come into contact with the stem of the plant as rodents or pathogens living in the
mulch may attack the bark.
Re-s'eeding
After the completion of the construction and planting projects, a seed mix will be evenly
spread on all bare areas. Please find a recommended seed mix below.
Table 2. Re-seeding Recommendations and Quantities
Scientific Name Common Name Percent
estuca rubra var. commutata eel fescue 40%
echampsia cespitosa ufted hairgrass 30%
olium multiflorum nual ryegrass 20%
Trifolium hybridum ike clover 10%
Planting recommendations: 25 lb. per acre
Maintenance: Weeding and Irrigation
The use of appropriate native species and careful planting ensures that the need for
ongoing maintenance will be minimized. However, some maintenance is required to
ensure that the young plants become established. It is recommended that weeding around
new plants be conducted once or twice a year during the months of May and September
for the first five years, and as often as needed after that. All Scot's broom, Himalayan
blackberry, and thistle should be monitored and eliminated from the site.
Irrigation may be required for upland species (vine maple, red-flowering currant, and
pine) for the fIrst three years or until plants are well established. Hand watering or
irrigating with overhead sprinklers once a week should be adequate during the hot
summer months. Wetland species that are planted near the creek corridor may require
less watering.
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