HomeMy WebLinkAboutWetland Delineation Revision 701044004
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WESTECH COMPANY
Environmental Consulting - Site Permitting
REVISED WETLAND DELINEATION AND MITIGATION PLAN
DABOB POST OFFICE ROAD
PARCEL #701044004
JEFFERSON COUNTY, WASHINGTON
September 2006
G. Bradford Shea, Ph.D.
Kim Loafman
Submitted to:
JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street
Port Townsend, Washington 98368
Submitted by:
WESTECH COMPANY
P.O. Box 2876
Port Angeles, Washington 98362
P.O. Box 2876 - Port Angeles, Washington 98362 - Telephone: (360) 565-1333 - Fax: (360) 452-6708
email: bshea@tenforward.com
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REVISED WETLAND DELINEATION AND MITIGATION PLAN
DASOS POST OFFICE ROAD
PARCEL# 701044004
JEFFERSON COUNTY, WASHINGTON
September 2006
G. Bradford Shea, Ph.D.
Kim Loafman
Submitted to:
JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street
Port Townsend, Washington 98368
Submitted by:
WESTECH COMPANY
P.O. Box 2876
Port Angeles, Washington 98362
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CONTENTS
CHAPTER/SECTION
1.0 INTRODUCTION
2.0 METHODS
3.0 WETLAND DELINEATION RESULTS
3.1 Existing Conditions
3.2 Description of Wetlands
3.3 Land Uses and Habitat Values
3.4 Wetland Types and Buffers
4.0 MITIGATION PLAN
4.1 Regulatory Setting
4.2 Project Impacts
4.3 Plan Components
4.4 Detailed Mitigation Measures
4.5 Planting Plan
4.6 Implementation and Timing
4.7 Mitigation and Restoration Monitoring
4.8 Contingency Plan
5.0 CONCLUSIONS AND RECOMMENDATIONS
5.1 Conclusions
.Q.2. _ . Recommend_ations
6.0 REFERENCES
7.0 TABLES
Table 1. Upland and Wetland Vegetation
Table 2. Site Soils
Table 3. List of Native Plants for Buffer Zone, Stream and Wetland
Restoration and Enhancement
FIGURES
Figure 1. Location Map
Figure 2. Vicinity Map
Figure 3. Site Map Showing Stream and Wetland Boundaries
Figure 4. Mitigation/Planting Plan
APPENDICES
Appendix A - Wetland Maps and Data Forms
Appendix B - Site Photographs
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1.0 INTRODUCTION
The property described as Assessor's Parcel #701044004, located on Government Lot 4
in Jefferson County, Washington, is an 8.92 acre parcel of land owned by Ms. Jeanette
Mifsud and Mr. Joseph Vaughan. The property is located in the SE quarter of Section 4
of Township 27 North, Range 1 West (Figures 1 and 2). The owners have applied to
Jefferson County for a building permit for a single-family residence and associated septic
system, plus a detached shop building.
The property at Dabob Post Office Road was checked for Critical Areas by Westech
Company (Westech). One Type 3 stream was found on the northwest side of the parcel,
as well as a wetland rated as Category III. A Type 4 stream and associated Category III
wetland were found in the southeast corner of the property. Ms. Mifsud and Mr. Vaughan
contracted with Westech to delineate those Critical Areas and determine wetland type
and buffer zones.
Field investigation of streams and wetlands was conducted by Dr. Bradford Shea and Mr.
James McDougall during the period of October 2005 through January 2006. A Wetland
Delineation and Mitigation Plan, dated February 2006, was prepared by Westech
Company and was submitted to Jefferson County for approval.
Jefferson County Department of Community Development, in a letter dated August 1,
2006, requested that the landowners and Westech staff meet on-site with County
biologist, Donna Frostholm (Farfan 2006). That meeting was conducted on August 17,
2006.
During the field visit on August 17th, it was determined by Ms. Frostholm that the northern
.wetlandwasa-Category-Ilwetland-andthat-an.extensionofthatwetlandwas.presenton- .
the south side of the driveway (based on soil tests in the area). It was also found that a
gravel driveway had been constructed which intrudes on the Type 3 stream buffer, and
the Category II wetlands buffer zones. In addition, a well had been installed along the
southern boundary near the driveway. From a telephone pole on Dabob Post Office
Road electrical conduits were installed under the driveway in a wetland area.
As a result of these findings, Westech Company has prepared this report to reflect the
changes found on-site. This Revised Wetland Delineation and Mitigation Plan will
discuss results of the delineation and mitigation measures which should be implemented
to restore and enhance the disturbed areas.
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2.0 METHODS
Wetlands were delineated in the field based on field methods recommended in the
Washinaton State Wetlands Identification and Delineation Manual (DOE 1997). Wetland
rating was accomplished according to the Guidelines of the Washinaton State Wetlands
Ratina System (Western Washinaton) (DOE 1993). Methods were essentially those
recommended by the U.S. Army Corps of Engineers for Routine On-Site Field Method of
Delineation of Wetlands (U.S. ACOE 1989). Guidelines and requirements of the
Jefferson County Critical Areas Code were applied as applicable (Unified Development
Code, Section 3, Land Use Districts 2001).
Wetland plants were primarily identified in the field, with subsequent collection and keying
when necessary. Plants were identified using the following sources:
Cooke 1997
Guard 1995
Pojar and MacKinnon 1994
Hitchcock and Cronquist 1973
Lyons 1997
Taylor 1995
Keying of plants using magnifying lenses and dissecting microscope was used as
necessary. Determination of wetland indicator status utilized regional keys published by
U.S. Fish and Wildlife Service (USFWS 1988).
Soils were determined through field examination. Soils were dug or augured to depths of
up to 18 inches using a wetland shovel, a 24 inch soil probe and a standard augur. Soil
. . -consistency-was-determined-by-feeling.for.grain size and .texture;...Soilmoisturewas.
determined at that time. In the event of saturated conditions in the hole, depth to
standing water was noted. Soil color was determined through comparison of field
samples with standard Munsell Color Charts (Munsell 1994). Soil was also examined for
presence of mottles, gley and other indicators of anaerobic soil oxidation.
Hydrologic conditions were determined through examination of topographic relief and
drainage patterns. Soil moistness was determined by hand as indicated above and in the
event of standing water, depth to standing water was noted.
Wetlands were determined based on the Routine On-Site Field Method used by
Washington Department of Ecology and the U.S. Army Corps of Engineers. Wetlands
were determined by a combination of vegetation, soil and hydrology indicators. Specific
transect and quadrat points were sampled along apparent wetland edges. Various points
were sampled for vegetation, soil and hydrology in order to determine wetland
boundaries. Appendix A contains wetland maps and data forms for one typical sample
point from each of the delineated wetlands.
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Wetlands were marked in the field with 24 inch wooden stakes. Wetland boundaries in
forested areas were indicated by use of "Wetland Delineation Boundary" flagging tape
placed at appropriate points in trees and shrubs. All boundaries were staked and/or
flagged every 20-25 feet. Wetland buffer zones were determined based on field
measurements and regulatory requirements and were staked in the field and marked with
orange and black striped flagging every 40-50 feet.
Specifically, field surveys included noting site characteristics such as hydrology, soil
conditions, and identification of plant species found growing in the area. Photo
documentation was also acquired. This reconnaissance of the Property assisted in
identifying characteristics which are used to classify wetland type. Wetlands were then
delineated. Once the wetland was rated by Westech staff, measurements were taken so
that the buffer zones could be marked for the regulated Critical Areas.
Jefferson County Assessor's parcel maps and U.S. Geological Survey maps were utilized
as base maps for wetland mapping. Design studies and maps for septic approval have
been prepared by Mr. John Fleming, P.E.. Mr. Fleming also identified and marked the
property lines, and provided brushed trails for access at some locations.
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3.0 WETLAND DELINEATION RESULTS
3.1 Existino Conditions
The Site is located on nearly level soils with the eastern end having a steeper gradient.
Elevation is roughly 10-25 feet above mean sea level (msl) in the western portion of the
Site (near DaboblTarboo Bay). The main portion of the property is less than 20 feet msl,
but the eastern portion rises in elevation to about 100 feet msl. The Site vegetation is
composed of a large field area with trees and shrubs near the streams and wetlands.
The eastern hillside is densely forested and contains both deciduous and coniferous
trees. The proposed location for the house is within the field area as shown in Figure 3.
Westech Company has located two wetlands on the Site that are oriented around the two
streams. (Figure 3). The Type 3 stream found on the northwestern portion of the parcel
has a forested/shrub-scrub wetland area (labeled as Wetland A) surrounding it with a field
wetland area (labeled as Wetland B) near the driveway. Wetland A varies from 40 to 150
feet wide extending south from the stream channel. Only the south side of this stream
was delineated since the home-site is on that side of the stream.
A separate wetland (labeled as Wetland C) is located in the southeast corner of the
parcel and is associated with a Type 4 stream. This area was found to contain a forested
wetland with sections of shrub-scrub wetland. Only the north side of this stream was
delineated since the south side was found to be off of the property. This wetland's width
averages approximately 50 feet from the stream channel.
A 500 foot long gravel driveway was installed within the last six months to access the
proposed building site (See Site Photographs in Appendix B). This driveway is 15 feet
-wide,Soil..takenfrom.twofootwidedrainageditches-on .both-sidesofthedrivewaywas
placed to the side, creating mounds one to two feet high. This soil had been seeded with
perennial ryegrass which has since revegetated the area.
Veaetation
Site vegetation consists of mixed shrub and field grasses in the upland areas and forest,
shrub-scrub and emergent grasses and sedges in the wetland areas. Upland areas are
dominated by Douglas fir and big leaf maple, especially on the eastern hillside. Forested
wetlands are dominated by alder and willows, with some western red cedar. Understory
plants in wetlands include salmonberry, horsetail, reed canary grass and Nootka rose. A
more complete list of plants is included in Table 1.
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Soils
Soils on the Site are of the Alderwood-Sinclair soil association (SCS 1975). These are
generally moderately well drained, gravelly soils on slopes underlain by compact glacial
till. The soils of the Site are of the Kitsap series, which generally consist of soils that have
been formed in glacial lacustrine or marine sediments on upland benches, terraces,
canyon slopes and ocean bluffs. Slopes range from 0 to 50 percent and annual
precipitation ranges from 25 to 45 inches. The specific soil type mapped on the Site is
listed below:
. Kitsap silt loam, 0 to 15 percent slopes (KtC). This soil is found in most places
with slopes that range from 4 to 9 percent. It is moderately well drained and the
permeability is very slow. Runoff is slow to medium and the hazard of soil erosion
is slight to moderate. The color to a depth of four inches is dark brown to grayish
brown with a silty texture. From 4 to 14 inches, a dark yellowish-brown silt loam
can be found. A dark grayish-brown silt loam lies below 14 inches and above 21
inches. Silty clay loams underlie this layer Included with this soil mapping unit are
small areas of Kitsap gravelly loam, 0 to 30 percent slopes, and small areas of
Alderwood, Sinclair, Cassolary, Everett, Hoypus, and Indianola soils.
Table 2 discusses specific soil characteristics found in different areas on the Subject
Property .
Hvdroloav
On this gradually sloping parcel of land, the hydrology of the Site consists of two streams
that originate from groundwater seeps. These streams flow southwest across the
..propertyjpass.under DabobPost Office RoadNia .culverts.thenemptyinto TarbooBay~.
There does not appear to be any blockage or obstruction of the two streams that would
cause unnecessary flooding. When the streams reach the relatively flat areas at the west
end of the parcel, the water slows. Over time, this may have resulted in deposits of fine
sediments that helped create the wetlands because of slow permeability of the on-site
soils.
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3.2 Description of Wetlands
There are three wetland areas found on the Site; one is located at the eastern end of the
parcel and the other two are located on the northwestern side of the parcel. These
wetlands are associated with the two streams also found on the property. This is shown
in Figure 3.
Wetland Area A
The large wetland located in the northwestern portion of the property consists of shrub-
scrub vegetation with large alder trees. This wetland borders a Type 3 stream that flows
to the southwest. Large patches of Himalayan blackberry can be found throughout this
wetland, but it is more concentrated towards the southern portion of the property.
Salmonberry and horsetail are the most dominant wetland plants with piggyback plant
included as well.
Wetland Area B
This is a small wetland area on the property. It is located south of the newly installed
driveway. Vegetation has been disturbed in this area and consists of facultative grasses
intermixed with upland grasses. The determination of this area as a wetland is based on
soil tests conducted in the area by Jefferson County staff biologist Donna Frostholm.
Wetland Area C
This wetland is categorized as a forested wetland with shrub-scrub vegetation found at
the northwestern edge in the more open areas. This wetland borders a Type 4 stream.
Large coniferous and deciduous trees such as red alder and western red cedar are
located within this wetland. The understory includes piggyback plant, horsetail, and
salmonberry with sedges in the wettest areas. Himalayan blackberry can be found in this
wetland as well.
Northern Stream Channel (Tvpe 3)
This stream appears to be perennial (year around) and flows through a well defined
channel from east to west. The channel is generally only two-four feet in width with a low
bank one-three feet in height. In some areas the channel is partially blocked by silt or
vegetation. Representatives of the Washington State Department of Natural Resources
(DNR) and Washington State Department of Fish and Wildlife 0NDFW) checked the
stream and found small fish near the mouth. Based on that finding, these agency
personnel classified the stream as a Type 3 stream (Fleming 2005, personal
communication).
Southern Stream Channel (Tvpe 4)
This stream appears to originate from groundwater seeps located on the southeastern
portion of the property. It appears to be a seasonal or perennial stream, most likely a
Type 4 (although if the seeps generally dry up during summer months, it may be a Type 5
stream).
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3.3 Land Uses and Habitat Values
The Site is currently is a partially developed property. A gravel driveway and a well have
recently been added. The landowners plan to build a single-family residence and install
an associated drainfield. A detached shop building will also be constructed near the
house-site which is a large field in the center of the property situated between the two
streams.
A large wooded area exists at the east end of the parcel where steeper slopes are
present. Deciduous trees border the two streams with large patches of blackberry and
salmonberry near the edge of the field. The presence of both field and forest areas
indicates moderately good habitat for mammals, birds and many other animals.
The wetlands on the Site appear to provide habitat for small mammals and birds. Larger
mammals including black-tailed deer and birds such as migratory waterfowl inhabit the
area. Fish were not observed using the streams by Westech staff, but Mr. Fleming stated
that WDFW had found fish in the mouth of the Type 3 stream located in the northwest
portion of the property. The wetlands appear to be year-round in terms of saturation and
generally do not appear to contain standing water except during winter months.
3.4 Wetland Tvpes and Buffers
Two of the wetland areas on the Subject Property (Wetlands A and B) have been
classified and appear to be Category II wetlands (Frostholm Person Communication
2006). The third wetland on the Site (Wetland C) is a Category III wetland (Wetland C).
They are diverse and contain mostly native species. Wetland locations are shown in
.Eigures3. These..wetlands appeartol>e above the regulatory threshold... in size. ....
The Category II wetland areas require a 100 foot buffer and the Category III wetland
requires a 50 foot buffer for development of a single-family residence. Flagging indicating
that size buffer zone has been placed around the south side of Wetland A, the western
side of Wetland B and the north side of Wetland C, all sides closest to the proposed
building site. Buffers 100 feet in extent have also been marked in the field for the two
streams as per Jefferson County Code requirements.
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4.0 MITIGATION PLAN
4.1 Reaulatorv Settina
This Mitigation Plan is intended to offset impacts occurring from existing land use
activities on the Site such as:
1) Placement of an access driveway intruding on the Type 3 stream buffer, one of
the Category II wetlands and the Category II wetlands' buffer zones.
2) Development of a 38 foot deep artesian well along the southern boundary near
the driveway.
3) Installation of electrical conduits running from a telephone pole on Dabob
Post Office Road under the driveway in a wetland area.
This Mitigation Plan is also intended to offset potential future impacts which may occur
upon construction of the residence and shop, as well as installation of a drainfield.
These mitigation measures will restore disturbed areas and also to enhance buffer areas
which have not been disturbed to any significant extent.
4.2 Proiect Impacts
Potential and existing impacts of the project include the following:
1) Disturbance of Negetation anddsoils alongdthe driveway relate d.to.construction
of the driveway itself, electrical utility installation, and digging of the well. The
driveway is 15 feet in width with two foot wide drainage ditches to either side for
a distance of approximately 550 feet. Portions of the lower driveway cross an
area which was a portion of Wetland Area B. An additional 350-400 feet of the
driveway is located in the wetland buffer.
2) Elimination of most native vegetation at the house-pad, and disturbance and
removal of some vegetation during installation of the drainfield. This is
expected to be relatively minor short-term disturbance.
3) Potential increased stormwater runoff and possible erosion due to construction
activities and increased impervious surfaces.
These impacts can be offset as described in the sections below. The mitigation
measures developed in this Plan are intended to fully offset impacts and to enhance the
existing habitat through additional plantings and implementation of erosion control
measures.
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4.3 Plan Components
The components of this Mitigation Plan are as follows:
1) Control potential erosion that may effect wetlands and streams through
project timing, emplacement of control measures, and revegetation.
2) Planting vegetation including shrubs and trees within planned areas to
enhance stream and wetland habitats, and to further protect the streams
and wetlands.
3) Utilizing proper drainage techniques along the driveway and at the home-
site.
These Plan components are described in detail in Section 4.4 below.
4.4 Detailed Mitiaation Measures
The detailed mitigation measures corresponding to the Plan Components listed above are
as follows:
1 a. Conduct grading and construction prior to October 1 and after April 1 to
avoid construction during the rainy season and consequent increased risk
of erosion and siltation.
1 b. Place a silt-fence at the downhill edge of the home and shop construction
site. to contain soil.and-sediments which might otherwise reach the stream
or wetlands.
1 c. Utilize other erosion control devices Oute netting, straw bales, etc.) as
necessary if erosion is observed. on the Site during construction.
1d. Revegetate graded areas as quickly as possible. Cover graded areas with
straw, netting or other stabilizer if to be left uncovered for more than seven
days during the dry season or more than two days during the rainy season.
2a. Planting of trees and shrubs should be carried out in the areas indicated in
Figure 4. Native species should be used in conformance with those listed in
Table 3.
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2b. Planting should be carried out by experienced persons. Plants may be
obtained from a native plant nursery or from other sources. Plants should
be watered during the first dry season if planted during the late spring or
summer. Recommended planting time would be early fall (late September
- October) so that fall and winter rains will encourage successful initial root
establishment.
3a. Drainage requirements should be specified by a qualified Civil Engineer.
There is a large quantity of water which apparently drains down from the
hills to the east. While much of this is carried in the streams, the presence
of fringe wetlands indicates that substantial amounts of near surface
groundwater may pass near the home-site. French drains, drywells or
similar measures may be necessary to divert and direct this water around
the home-site and back into natural patterns.
3b. The driveway is mainly oriented upslope to down-slope (east-west),
however, there is one area where the driveway will travel across the
gradient (within Wetland area B). Two a-inch culverts will be placed at the
top and bottom of this section of the driveway (See placement location in
Figure 3) to maintain a relatively dry access and prevent erosive washouts.
The installation of these culverts should be angled in such a way as to
intercept water flowing to the southwest. Placement of these culverts will
require temporary removal of 12-16 inches of driveway fill material.
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4.5 Plantina Plan
Revegetation and additional vegetation planting will occur as an integral part of the
project. Newly graded construction areas will be revegetated as quickly as possible
following the completion of construction. These areas will be reseeded with a native
grass seed mixture to stabilize soils and reduce erosion or sedimentation which may
otherwise affect wetlands or streams. Additional trees and shrubs will be planted within
enhancement and restoration areas as indicated in Figure 4 and Table 3.
Enhancement areas include the following:
. Areas 1A and 2A are located in the stream buffer north of the Type 3 stream.
These areas are on the side farthest from the stream where facultative and upland
plant species will be used.
. Areas 1 Band 2B are also located in the stream buffer north of the Type 3 stream.
However, these areas are on the side closest to the stream so wetland plant
species will be used.
Restoration areas include the following:
. Area 3A includes the disturbed buffer area north of the driveway near the power
pole. Both wetland and upland plant species will be used in this area. The small
wetland area near the power pole will be restored and the nearby buffer enhanced.
. Area 3B is the disturbed area of the wetland buffer south of the driveway.
. Area 4 encompasses part of the buffer zone and Wetland B. It includes disturbed
-areas near the well and along a section of the driveway, .
A total of 126 trees and shrubs will be planted as specified in Table 3 plus 40 emergent
wetland plants. Trees will be placed on a minimum of ten foot centers. Shrubs will be
spaced at least six feet apart within the planting areas. Plants should be planted in a
random configuration within each area to encourage a natural appearance. However,
plants have been divided into areas based on likely soil moisture regimes and should not
be substituted into other areas.
The Type 3 stream and Wetland A have areas overgrown with reed canary grass and
Himalayan blackberry. Both of these species are considered non-native and are invasive.
Reed canary grass was originally introduced from Europe as a pasture grass. Due to its
vigorous growth, relatively tall habit, and heavy seed production, it out-competes many
native species. Both of these species should be removed by hand methods to the extent
feasible.
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Removal of plants should be by hand methods or hand-carried power tools to avoid
significantly disturbing topsoils within the wetlands and buffer zones. Revegetation is a
must following removal of any weedy species. These areas should be replanted with
wetland obligate species such as sedges. Good choices include slough sedge (Carex
obnupta) or beaked sedge (Carex utriculata), for example.
To increase the potential for all the planted species to survive, four inches of mulch
should be placed around the installed plants with the mulch two inches away from the
stem of the plants. Non-native plants should be reduced to less than 10 percent cover in
all planting areas.
4.6 Imolementation and Timing
Project construction should occur after April 1 but before October 1 if at all feasible. If
work is conducted during the rainy season, all erosion control measures should be in
place prior to grading or construction. Plantings should be carried out in early spring
(March through April) or early fall (late September through October) if possible. If
plantings occur during summer months, supplemental watering may be necessary.
4.7 Mitiaation and Restoration Monitorina
Monitoring of success for the enhanced and restored areas should be carried out on the
following schedule:
1) Following construction, plant new native trees and shrubs within the first
u180~days,either.d uringtheearlyspring(March""April)ofutheearlyfall(late
September-October) seasons. Plant trees and shrubs according to the
Planting Plan (Table 3 and Figure 4).
2) Prepare an initial monitoring report, approximately six months to one year
following plantings, evaluating the success of the plantings. The report
should address the success of plantings, health and productivity of the new
plants, and any problems with erosion control. The landscape contractor
should guarantee 100% survival for the first year (standard industry
practice). Any plant mortality should be noted and corrected if plant survival
falls below that level during the first year or below 85 percent in successive
years.
3) The performance standard for non-native, invasive species must be
adhered to. The percent cover of non-native species in enhancement
areas should not exceed ten percent. If monitoring indicates that more than
ten percent of these areas consists of non-native or invasive species,
contingency measures must be implemented.
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4) Monitoring needs to be conducted for five years with a monitoring report
submitted annually. Note any corrective actions which are necessary to
maintain the overall health and productivity of the streams, wetlands, and
buffer zones.
All reports should be submitted to Jefferson County for review and approval.
4.8 Continaencv Plan
A Contingency Plan should be prepared in the event that the plantings or erosion control
measures are unsuccessful. This should occur if planting survival is less than 70 percent
over the first two years or if major sedimentation is occurring which affects the streams or
wetlands. The Contingency Plan should include actions which will be taken to correct any
defects and accomplish the intended purpose of the Project.
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5.0 CONCLUSIONS AND RECOMMENDATIONS
4.1 Conclusions
Two streams were found on the property. These included a Type 3 Stream on the
northwestern corner of the parcel and a Type 4 Stream near the southeast property
corner. The Type 3 stream was flanked by two Category II wetland areas. The Type 4
stream had a Category III wetland associated with it. An access driveway and a well have
already been installed on the property. It appears that there is sufficient space for the
landowners to build a home and detached shop in the field area in between the proposed
reduced wetland buffer zones in the center of the property as illustrated in Figure 3. This
compensatory Mitigation Plan has been developed to offset impacts of existing
development on this Site and future project proposals as outlined by the landowners to
Westech staff. Implementation of this Mitigation Plan is expected to result in a no net loss
of wetland function, value or acreage.
4.2 Recommendations
Figure 3 shows mapped locations of regulatory wetlands, streams and associated buffer
zones found on the Site. The project appears to be exempt from the 150 foot buffer zone
from the shoreline of Tarboo Bay due to the presence of Dabob Post Office Road and
other existing developments (Greg Ballard 2005, personal communication).
It appears that the landowners have enough space to place the home in between the
buffer areas for Wetland A and the buffer for Wetland C, provided the buffer zone from
the Type 3 stream and Category II wetland are reduced by up to 25 feet as indicated in
Figure 3.
According to the Jefferson County Code, the house footprint -may .only.encroachintothe
stream buffer by 25 percent (25 feet on a 100 foot buffer zone) or no more than 38 feet
unless an Economic Use Variance is applied for and granted by the County. This clause
may allow for more room if needed on the southwest corner of the proposed home-site.
Wetland buffers are not limited by the 25 percent requirement.
Should the landowners submit a Buffer Reduction request or a Variance Application to
Jefferson County, Westech Company recommends that the County grant such a
Variance based on the Mitigation Plan developed and included within this report. The
Mitigation Plan for this project is intended to result in a zero or net positive impact on the
streams and wetlands on this Property.
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6.0 REFERENCES
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Ballard, G. 2005. Personal Communication between Dr. G. Bradford Shea of Westech
Company and Greg Ballard of Jefferson County Department of Community
Development. Port Angeles, Washington.
Cooke, S.S. 1997. A Field Guide to the Common Wetland Plants of Western
Washinaton and Northwestern Oreaon. Seattle Audubon Society. Seattle,
Washington.
Farfan, Michelle. 2006. Email received from Michelle Farfan, Project Planner, Jefferson
County Department of Community Development, on August 1, 2006. Port
Angeles, Washington.
Guard, J. 1995. Wetland Plants of Washinaton and Oregon. Lone Pine Publishing.
Renton, Washington.
Hitchcock, C.L. and A. Cronquist. 1973. Flora of the Pacific Northwest. University of
Washington Press. Seattle, Washington.
Jefferson County. 2001. Jefferson County Unified Development Code. Section 3, Land
Use Districts, Subsection 3.6 - Wetlands. Department of Community
Development. Port Townsend, Washington.
JSF Engineering. 2005. Unpublished maps and data furnished to Westech Company by
Mr. John Fleming, JSF Engineering. Port Angeles, Washington.
Lyons, C.P. 1997. Wildflowers of Washinaton. Lone Pine Publishing. Renton,
Washington.
Munsell Color. 1994. Munsell Soil Color Charts. GretagMacbeth. New Windsor, New
York.
Pojar, J. and A. MacKinnon. 1994. Plants of the Pacific Northwest Coast. Lone Pine
Publishing Company. Redmond, Washington.
Taylor, R. 1995. Northwest Weeds. Mountain Press Publishing Company. Missoula
Montana.
U.S. Army Corps of Engineers (ACOE). 1989.
Delineatina Jurisdictional Wetlands.
Washington, D.C.
Federal Manual for Identifvina and
U.S. Government Printing Office.
U.S. Fish and Wildlife Service (USFWS). 1988. National List of Species that Occur in
Wetlands; Region 9 (and Supplement). Biological Report 88(26.9). Portland,
Oregon.
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U.S. Geological Survey. 1953. Quadrangle Map of Quilcene, Washington. 1 :24,000
Scale. Published 1953, not photorevised. Boulder, Colorado.
U.S. Soil Conservation Service (SCS). 1975. Soil Survey of Jefferson County Area.
Washinaton. U.S. Department of Agriculture. Washington, D.C.
Washington Department of Ecology (WDOE). 1993. Washinaton State Wetlands Ratina
System: Western Washinaton. Second Edition. Publication # 93-74. Olympia,
Washington.
Washington Department of Ecology (WDOE). 1997. Washinaton State Wetlands
Identification and Delineation Manual. Publication #96-94. Olympia, Washington.
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TABLE 1. UPLAND AND WETLAND VEGETATION
Common Name Scientific Name Indicator *
Wetland plants
Western red cedar Thuja plicata FAC
Red alder Alnus rubra FAC
Soft rush Juncus effusus FACW
Tufted hairgrass Deschampsia cespitosa FACW
Red fescue Festuca rubra FAC
Foxtail (short-awn) Alopecurus aequalis OBl
Horsetail Equisetum arvense FAC
Reed canary grass Phalaris arundinacea FACW
Salmonberry Rubus spectabilis FAC
Nootka rose Rosa nutkana FAC
lyngby sedge Carex Iyngbyei OBl
Upland plants
Douglas fir Pseudotsuga menziesii FACU
Western hemlock Tsuga heterophylla FACU
Bigleaf maple Acer macrophyllum FACU
Red elderberry Sambucus racemosa FACU
Oceanspray Holodiscus discolor UPl
Teasel Dispacus sylvestris NI
.Whitedclover T Iitoliumrepens EACU
Canada thistle Cirsium arvense FACU
Stinging nettle Urtica dioica FACU
Trailing blackberry Rubus ursin us FACU
Himalayan blackberry Rubus discolor FACU
Sword fern Polystichum munitum FACU
Bracken fern Pferidium aquilinum FACU
Salal Gaultheria shallon FACU
Perennial ryegrass Lolium perenne FACU
*Indicators: UPl = Upland Plant, FACU= Facultative Upland Plant (more upland than
wetland), FAC = Facultative (borderline wetland plant), FACW = Facultative
Wetland Plant (prefers wetland conditions), OBl = Obligate (only found in
wetlands), NI= non indicator.
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TABLE 2. SITE SOILS
Wetland Tvpe Color Value/Chroma
Wetland A sandy-silt loam over glacial till dark brown 3/2 (10YR)
This soil is a very shallow, highly
organic dark-brown soil over glacial
till at 3-6 inches depth. Some mottles
were observed.
Wetland B Silty clay loam with mottles dark brown 3/2 (10YR)
Wetland C silt loam over glacial till dark grey-brown 3/1 (1 OYR)
This soil is a very gravelly
silt-loam over glacial till at
10-12 inches. Value varies
between 3/1 and 2/1 with gley.
Upland Forest These soils were lighter brown brown-tan 3/3 (10YR)
sandy-silt loams. These soils were
deep and well drained.
*Value/Chroma readings are from comparison of field samples with Munsell Soil Color
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I Charts.
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TABLE 3. LIST OF NATIVE PLANTS FOR BUFFER ZONE,
I STREAM AND WETLAND RESTORATION AND ENHANCEMENT
I Location Species Number Scientific Name Size
Area 1A Douglas fir 4 Pseudotsuga menziesii 3 gallon
I Salal 5 Gaultheria shallon 1 gallon
Area 1 B Western red cedar 6 Thuja plicata 3 gallon
I Salmonberry 5 Rubus spectabilis 1 gallon
Pacific ninebark 6 Physocarpus capitatus 1 gallon
I Area 2A Big-leaf maple 7 Acer macrophyllum 3 gallon
Vine maple 6 Acer circinatum 1 gallon
I Area 2B Western red cedar 4 Thuja plicata 3 gallon
Red alder 6 Alnus rubra 3 gallon
I Salmonberry 8 Rubus spectabilis 1 gallon
Area 3A (Buffer) Black hawthorn 6 Crataegus douglasii 3 gallon
I Oceanspray 10 Holodiscus discolor 1 gallon
Area 3A (Wetland) Lyngbeyisedge 10 Carex Lyngbeyi 1 gallon
I Soft rush 10 Juncus effusus 1 gallon
Area 3B (Buffer) Western red cedar 6 Thuja plicata 3 gallon
I Red alder 6 Alnus rubra 3 gallon
Pacific ninebark 6 Physocarpus capitatus 1 gallon
I Area 3B (Wetland) Lyngbeyisedge 10 Carex Iyngbeyi 1 gallon
Horsetail 10 Equisetum arvense 1 gallon
I Area 4A (Wetland) Red-osier dogwood 10 Comus stolonifera 1 gallon
Black twin berry 10 Lonicera involucrate 1 gallon
I Swamp gooseberry 7 Ribes lacustre 1 gallon
Scouler's willow 8 Salix scouleriana 1 gallon
I Area 4B (Buffer) Oceanspray 5 Holodiscus discolor 1 gallon
Pacific ninebark 5 Physocarpus capitatus " 1 gallon
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APPENDIX A
WETLAND MAPS AND DATA FORMS
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DATA FORM 1 Routine Wetland Determination (W A State Wetland Delineation Manual or 1987 Corps
Wetland Delineation Manual)
Project/Site: Dabob Post Office Road
Date: 1-30-06
~pplicant/owner: Joseph Vaughan and Jeanette Misfud County: Jefferson
State: Washington
~nvestigator(s): Dr. G. Bradford Shea, James McDougall and S/T/R: 4j27Nj1W
Dustin Rondeau
100 Normal Circumstances exist on the site? R Community ID: Wetland
.^ no
s the site significantly disturbed (atypical situation)? yes I Transect ID:
s the area a potential Problem Area? yes Plot ID: VSH 1
IvEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
Reed canary grass H-80% FACW+
Pharis arundinacea)
Soft rush H-5% FACW+
Juncus effusus)
Himalayan blackberry 5-5% FACU
Rubus discolor)
Horsetail H-5% FACW+
(Equisetum arvense)
Cutleaf blackberry 5-5% FACU+
Rubus laciniatus)
HYDROPHYTIC VEGETATION INDICATORS:
Dfo of dominants OBL, FACW, It FAC: 90%
Check all indicators that apply & explain below:
Regional knowledge of plant communities _X_ Wetland plant list (Nat'1 or regional) _X_ OTHER_
physiological. or reproductive adaptations Morphological adciptafions -
Technical Literature _X_ Wetland Plant Data Base -
Hydrophytic vegetation present? I\~~;~
~ no
Rationale for decision/Remarks: Majority of plant species were found to be wetland indicator species.
IHYDROLOGY
~s it the growing season? yes Iwater Marks: yes E Sediment Deposits: yes Ifg
iiJ
Based on: Time of year Drift Lines: ves ,,,,,%p!; Drainaae Patterns: yes IIi
IllQ
Ioxidized Root (live roots) fi Local Soil Survey: Bno
Ioepth of inundation: inches Ichannels < 12 in. .yes
Depth to free water in pit: inches Water-stained
Depth to saturated soil: _6_ inches FAC Neutral: yes ;r!Ji)l~r\V
Leaves: yes IQ
Check all that apply & explain below:
Stream, Lake or gage data: _ Other:
Aerial DhotoaraDhs: Other:
Wetland Hydrology present? II no
Rationale for decision/Remarks: Soil was saturated at a depth of six inches.
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SOILS
Map Unit Name Kitsao Series
Series & Phase)
~axonomy (Subgroup) KtC ( Kitsao silt loamL
Drainage Class
c
Field observations confirm
mapped type?
II
no
Profile Description
Matrix color Drawing of soil
Depth Horizon (Munsell Mottle colors Mottle abundance Texture, concretions, profile
(inches) moist) (Munsell moist) size & contrast structure, etc. (match description)
Medium
0-6" A Brown I 0-6" I
3/2 (10YR) Silty
Medium "" clay
6-12" B Brown ~ loam
3/2 (10YR) I 6-12" I
Medium
12+" C Brown .......... ~ Clay
3/2 10YR Muck
I 12-18" I Clay
.......... ~ Muck
Hydric Soil Indicators: (check all that apply)
.... ... .... ... ... ..
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer of Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
Gleyed or Low-Chroma Colors Other (explain in remarks)
Hydric soils present? m~ no
Rationale for decision/Remarks: Saturation level suggests hydric soils as does the soil texture.
Wetland Determination (circle)
Hydrophytic vegetation present? no
Hydric soils present? no Is the sampling point Ir no
.~....~
Wetland hydrology present? no within a wetland?
Rationale/Remarks: Hydrology, vegetation, and soils are all indicative of a wetland.
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DATA FORM 1 Routine Wetland Determination (WA State Wetland Delineation Manual or 1987 Corps
Wetland Delineation Manual)
Project/ Site: Dabob Post Office Road
Date: 1-30-06
Applicant/owner: Joseph Vaughan and Jeanette Misfud County: Jefferson
State: Washington
Investigator(s): Dr. G. Bradford Shea and Mr. James S/T/R: 4j27Nj1W
McDougall
Do Normal Circumstances exist on the site? . no ommunity 10: Upland
s the site significantly disturbed (atypical situation)? yes i T"ranseet 10:
s the area a potential Problem Area? yes Plot 10: VSH 2
VEGETATION
Dominant Plant Species Stratum Indicator Dominant Plant Species Stratum Indicator
Himalayan blackberry 8-60% FACU
Rubus discolor)
Horsetail H-20% FACW+
Equisetum arvense)
80ft rush H-5% FACW+
Juncus effusus)
Trailing blackberry H-15% FACU
(Rubus ursinus)
HYDROPHYnC VEGETATION INDICATORS:
0/0 of dominants OBL, FACW, a. FAC: 25%
Check all indicators that apply & explain below:
Regional knowledge of plant communities _X_ Wetland plant list (Nat'1 or regional) _X_ OTHER_
Physiological or -reproductive adaptations .. ~ . Morphological adaptations -
Technical Literature _X_ Wetland Plant Data Base -
Hydrophytic vegetation present? ~
yes I~
Rationale for decision/Remarks: Seventy-five percent of the dominant species were upland plants.
HYDROLOGY
~s it the growing season? yes iNater Marks: yes Sediment Deposits: yes r:a
Based on: Time of year. Drift Lines: yes ~ Drainaae Patterns: yes flfB
::>xidized Root (live roots) II Local Soil Survey: Eno
Depth of inundation: inches :hannels < 12 in. yes
pepth to free water in pit: inches Water-stained
pepth to saturated soil: inches FAC Neutral: E no ')~i!))
Leaves: yes IQ
~heck all that apply & explain below:
~tream, Lake or gage data: _ ::>ther:
lAerial ohotoaraohs: Other:
[Wetland Hydrology present? yes ;1
Rationale for decision/Remarks: There was no evidence of wetland hydrology in this location.
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SOILS
Map Unit Name _Kitsap Series
Series & Phase)
axonomy (Subgroup) KtC (Kitsap Silt Loam)
Drainage Class B
Field observations confirm
mapped type?
E
no
Profile Description
Matrix color Drawing of soil
Depth Horizon (Munsell Mottle colors Mottle abundance Texture, concretions, profile
(inches) moist) (Munsell moist) size & contrast structure, etc. (match description)
0-6" A 4/2 (10YR) I 0-6" I Silty
Gray Brown clay
.......... loam
3/3 (10YR) ':a.
6-12" B Dark Brown
I 6-12" I Silty
12+" C 3/3 (10YR) "" Clay
Dark Brown ...... loam
Clay
I 12-18" I, Silt
loam
~ with
gravel
Hydric Soil Indicators: (check all that apply)
Histosol Concretions
Histic Epipedon High Organic Content in Surface Layer of Sandy Soils
Sulfidic Odor Organic Streaking in Sandy Soils
Aquic Moisture Regime Listed on Local Hydric Soils List
Reducing Conditions Listed on National Hydric Soils List
I-- _ Gleyed or Low-Chroma Colors Other (explain in remarks)
Hydric soils present? Ii"
yes k~
Rationale for decision/Remarks: Insufficient evidence to support idea that hydric soils are present in this plot.
lWetland Determination (circle)
Hydrophytic vegetation present? yes IFl\X,
\t~
Hydric soils present? yes "~ Is the sampling point yes
Iwetland hydrology present? yes ~ within a wetland?
Rationale/Remarks: Soils, hydrology, and vegetation are not consistent with criteria which would indicate a wetland.
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APPENDIX B
SITE PHOTOGRAPHS
WW988REVDBWD.APPB/091206/xmk B-1
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1. Looking eastward across the southern portion of the Property.
2. Area near the proposed access driveway.
WW988REVDBWD.APPB/091206/xmk B-2
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~ .
3. Adjacent oyster farm shell pile to the south.
4. Dabob Post Office Road (Site on right).
WW988REVDBWD.APPB/091206/xmk B-3
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5. Forested hillside - ei:1stern end of Property.
6. Upland fields - south-central area.
WW988REVDBWD.APPB/091206/xmk B-4
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7) Access driveway.
8) Wetland Area B and buffer zone.
WW988REVDBWD.APPB/091206/xmk B-5