HomeMy WebLinkAboutWetland Mitigation Addendum 995600015Steve Cross
Addendum to Buffer Reduction Report
And
Revegetation Plan
Parcel # 995-600-015
September 2004
Contents
Introduction
Buffer Reduction Plan
Buffer Protection
Stormwater Control
Fencing
Revegetation Plan
Summary
Appendix
Sheet # 1 Buffer Reduction Map
Sheet #2 Planting Plan
Table # 1 Plant List and Landscape Specifications
Table #2 Re-seeding Recommendation and Quantities
Installation Specification and Recommendations
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Steve Cross
Addendum to Buffer Reduction
and Revegetation Plan
Parcel # 995-600-015
September 2004
Introduction
This report has been prepared for Steve Cross as part of apre-purchase feasibility study to define
a building site on the subject parcel, Lot 15 between Argyle Lane and the Port Ludlow Golf
Course, in Port Ludlow, Washington. The entire parcel falls within the 100-foot buffer of a
Class II Wetland and associated stream as outlined in the Bob Harrington Wetland Delineation
Report (Olympic Wetland Resources, Inc (OWR), November 2003). A previous buffer
reduction plan was prepared (OWR, January 2004) but a required setback of 50 to 60 feet from
the Port Ludlow Golf Course was not included. This report addresses the Golf Course setback
and includes a revegetation plan as required by a buffer reduction.
Buffer Reduction Plan
In order to accommodate a feasible building site, this project will require the reduction of the
standard 100-foot buffer by more than the allowable 25% (Section 3.6.9 (6) Reducing Buffer
Widths). Goals for this project are to define a building area with the least degradation or impacts
to the wetland buffers and to specify native species in the revegetation plan, which will
eventually restore original buffer functions and values.
During a meeting with Steve Cross on September 3, 2004 proposed building plans and site
locations were reviewed. The proposed structure, including construction impacts, will fall within
25 feet of the delineated wetland edge. The proposed house size, without the garage, is
approximately 1800 square feet. Neighboring houses range from 1700 square feet to 2600
square feet (not including garages which average an additional 500 square feet). The projects
will be built on the southern edge of the site, as far away from the wetland edge as possible.
Impacts will still be within 25 feet of the wetland edge.
Buffer reduction will be applied to allow the applicant to build a modest single-family residence
within Lot 15. Please refer to the enclosed map for a potential building site location (Appendix,
Sheet #1, Potential Building Envelope).
Buffer Protection
Vegetation should only be removed in the area specifically required for the building footprint
and driveway. The area to be cleared must be clearly marked before any site clearing begins.
Machinery will remain within the marked boundaries.
Presently this site consists of a high diversity of mature native vegetation (22 species). No
additional vegetation within the remaining buffer will be removed; the preservation of all
Addendum to Buffer Reduction and Planting Plan 1 Olympic Wetland Resources, Inc
September 2004
existing large trees and shrubs in the buffer is critical. Exceptions may include the small and
dead standing alders under the canopy of the evergreen trees along the golf course right-of -way.
In order to assess the site impacts from future construction, these alders were marked with
orange flagging during a site visit on September 8, 2004, at the request of Steve Cross. Removal
of the alders will be executed with minimal impacts to surrounding shrubs and no machinery will
be used in this location.
Stormwater Control
All storm water from the construction project and finished home site will be directed away from
the wetland. Sediment or runoff from the project should be minimized with the use of straw
bales or sediment fences. This will be required during the entire building process and will
continue to be required until the vegetation becomes established and can act as a natural filter. A
gravel base will be placed on driveways and parking areas.
Fencing
A permanent physical barrier will be installed between the driveway/home site and the remaining
wetland buffer. This fencing is critical to prevent further degradation to the wetland by future.
owners and preserve remaining vegetation within the wetland buffer. Final-xeyegetatLOn of the
site should not be conducted until the permanent fencing is installed. Fence sari con ist ofsplit
rail fencing, logs, or formal fencing. The fence should be permanently maitrtairied.
Revegetation Plan
t
The primary goal of this revegetation plan is to minimize further buffer imp~cts,by ~lattng y.
native trees and shrubs, which can tolerate conditions found on this site. Sp~c~~~'s`~`ho`sen fQr ~_._ ~ "
replanting are common to many landscape plans. Plantings may be rearranged to suit landscape
and aesthetic choices after final home site and fencing are complete. Existing trees and shrubs
should be protected during the construction and revegetation process. Secondary goals for this
plan include revegetation of the site to increase species diversity, thereby increasing habitat value
for wildlife.
The impacted area for a home site and a driveway is approximately 3,700 square feet (40' X 40',
home construction zone, and 12' X 60' driveway). The planting plan includes enhancing areas
adjacent to the driveway and to the perimeter of the construction site. The buffer required by the
Port Ludlow Golf course will be planted with short native shrubs so the view is not impacted.
Included in the Appendix is a planting plan with locations and numbers of each species to be
planted (Sheet #2).
Plants included in the revegetaion plan include vine maple, Sitka spruce, red cedar, hazelnut, red-
flowering currant, and Oregon grape. Complete landscape specifications are listed including
quantities, sizes, optimum locations, and spacing for each plant. All remaining bare areas should
be re-seeded with the seed mix included in the Appendix (Table #1 and Table #2). Also included
in the Appendix is a directory of local nurseries, which supply native plants.
Proper installation procedures of newly planted species ensure higher survival rates.
Revegetation requirements are outlined in more detail in the Appendix (Installation
Specifications and Recommendations). It is critical to the success of any newly planted trees and
Addendum to Buffer Reduction and Planting Plan 2 Olympic Wetland Resources, Inc
September 2004
shrubs to be maintained for the first two to three years. Maintenance includes watering and
weeding and replacement of plant material that does not survive after the initial planting.
Summary
The subject parcel (Lot 15) owned by Bob Harrington and under pre-purchase feasibility study
by Steve Cross is completely within the boundaries of a Class II wetland buffer (100 feet). The
site has been delineated and a buffer reduction plan has been prepared (OWR November 2003,
and January 2004). Other setbacks for the site include a 50 to 60 foot setback from the golf
course. This report is an addendum to the above reports and includes the required revegetation
plan.
To accommodate a modest single-family residence (approximately 1800 square feet, excluding
.garage} buffers will need to be reduced to 25 feet in some locations. To mitigate impacts all
building will be located as far from the wetlands as possible, a fence will be installed, and the
enclosed revegetation plan will be implemented.
Boundaries of house and driveway footprint will be clearly marked prior to commencement of
clearing, in order to avoid further impacts to the reduced buffer. Impacts are estimated to be
3700 square feet. Mitigation strategies include revegetating the site with over 90 native trees and
shrubs. These plants will be installed after the permanent fence and final construction is
complete. The success of this project will be dependent on ongoing maintenance.
Final inspection should include compliance with the mitigation plan and should follow the
installation of the fence and all native vegetation. Final determination of buffer reduction and
building site approval will be by the Jefferson County Department of Community Development,
Critical Areas Division.
If I can be of further assistance, please don't hesitate to call.
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Dixie Llewellin, Principal Biologist
Olympic Wetland Resources, Inc. _ ._ ..-~
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1987 Corps of Engineer Manual
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Addendum to Buffer Reduction and Planting Plan 3 Olympic Wetland Resources, Inc
September 2004
Appendix
Sheet #1 Buffer Reduction Map
Sheet #2 Planting Plan
Table # 1 Plant List and Landscape Specifications
Table #2 Re-seeding Recommendation and Quantities
Installation Specification and Recommendations
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~'uie 1\faple (10) Sitla Spivee (8)
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Red Cedar (8)
DogROOd(15)
Red-flowering
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Oregon Grmpe (20) Cuirant(20)
Golf Course
Setback
Native plants chosen for this plan
are offen used in landscape settings.
Actual configuration of plants
can be rearranged after final
homesite consturction
and fencing are complete.
Table 1. Wetland Plant List and Landscape Specifications
Scientific Name Common Nance USFWS Loacation Condition Size Sppcng Quantity
Rating
Trees
Acer circinatum Vine maple FACU shade container 2-Sgal 6' 10
Picea sitchensis Sitka spruce FAC shade container 2-Sgal 10' 8
Thuja plicata Cedar FAC shade container 2-Sgal 10' 8
Total 26
Shrub
Berberis nervosa Dull Oregon grape FACU sunny container 1 gal 2' 20
Corms sericea Red-osier dogwood FAC sunny container 2ga1 4' 15
Corylus cornuta Hazelnut FACU shade container 2ga1 4' 10
Ribes sanguineum Red-flowering Curran FACU sunny container 1-2ga1 5' 20
Total 65
Legend
Scierititic and Common names: Scientific name according to Hitchcock and Conquist (1976) Flora of the Pacific Northwest
USFWS Rating: OBL Obligate wetland plants almost always found in wetland (99%), FACW Facultative wetland plants usually in wetlands (67-99%)
FAC Facultative wetland plants usually in wetlands but occasionally in uplands (34-66%)
Location: Plant location on site, also refer to planting plan for clarification.
Condition: As available from nurseries.
Size: As typically planted for restoration projects.
Spacing: Recommended spacings.
Quantity: Total number of plants for project.
Table 2. Re-seeding Recommendations and Quantities
Scientific Name Common Name Percent
Festuca rubs var.
commutata Red fescue 40%
Dechampsia cespitosa Tufted hair rass 30%
Lolium multiflorum Annual a rass 20%
Trifolium hybridum Alsike clover 10%
Planting recommendations: 25 lb. per acre
Native Plant Nurseries
Fourth Corner Nurseries, 3057 E. Bakerview Road Bellingham WA 98226 (360) 734-0079
Shore Road Nursery, 616 Shore Road Port Angeles, WA 98362 (360) 457-8482
Sound Native Plants, P.O. Box 7505, Olympia, WA 98507 (360) 943-7026
Woodbrook Nursery, 1620 59th Ave. Gig Harbor WA 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 34 inches in diameter.
When planting acontainer-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
finer texture than the potting or field-growing soil, will generally cause water to
flow around the root ball instead of into it; root balls covered in this way may "- ~ ~ T°
receive water only from below. To allow direct wetting of the root ball from ', ; ` ;~~ {~~ '
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above, install the plant so that the top of the nursery soil is slightly higher than the
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.
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.
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 and red-flowering currant) 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.
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