HomeMy WebLinkAboutSpecial Report (053)
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Olympic Wetland Resources, Jne,
Dixie L1ewellin, Principal Biologist
A wetland delineation was coriducted on March22, 2004 for Quen Zorrah. The subject parcel is located
within the Bishop Hill Subdivision east of Center Valley Road. The delineated Class II wetland is
confined to a drainage corridor that drops approximately 4- feet in elevation from the surrounding terrain.
Recent logging has removed the majority of vegetation from the 100 buffer associated with this Class II
wetland.
The proposed building site is within the cleared 1 DO-foot buffer. Buffer averaging and reduction are
allowed, under certain circumstances, as defined in the Unified Development Code (Section 3.8
Averaging Buffer Widths). Reducing the buffer for the preferred home site location will not adversely
impact the wetland functions and values. The buffer will be increased to the west of the building site (as
indicated in the Appendix Sheet # 1, Buffer Averaging Map). A high quality wetland was identified to
the west and north of the subject parcel; this wetland will receive added benefits from an increased
buffer. The buffer will be reduced by approximately 75 feet for the single-family residence and increase
the same amount to the west; the total square footage of buffer will remain the same.
The site is has a high diversity of native species, withI4 wetland species, and 12 upland species. Over
time pre-existing plant communities will become established if aggressive weeds such as Scot's broom,
Himalayan blackberry, and thistle are controlled. It is recommended that additional native trees and
shrubs be planted to enhance the impacted buffer. Species could include cedar (does best in shade),
spruce, Douglas' fir, vine maple, salmonberry, and Indian plum. Included with this letter is a summary
of installation specification and recommendations.
If you need any further information please feel free to contact me.
Dixie Llewellin, Principal Biologist
Olympic Wetland Resources, Inc.
Certified for Wetland Delineation, 1987 Manual.
Wetland Training Institute, June 1995.
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I ~,;y fl1le: Buffer Averaging Map SmIe: Sheet
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\ 't..- Parcel #901 355 009
\ 856 50Ib Street May 2004 #1
~\ . Port i1wnsend, WA 98368 ctlellt: Quen Zorrah
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360385-6432 2023 E. Sims Way #206 Job #: 2004 8488
Port Townsend, WA 98368
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Draine e
Corrid
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Buffer
to
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662'
Access
Road
All wetland locations
and sizes are approximate;
to establish exact points
a formal survey is required
Delineated Wetland Edge
100' Buffer From Wetland Edge
Buffer Average
. Flagged delineation markers
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Installation Specifications and Recommendations
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Fall Instal/ation
Planting sho.lIld 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 wanner 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.
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
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
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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
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.
Re-seeding
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 Red fescue 40%
echampsia cespitosa Tufted hairgrass 30%
olium multiflorum nnual ryegrass 20%
Trifolium hybridum lsike clover 10%
Planting recommendations: 25 Ib, 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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