HomeMy WebLinkAboutWetland Delineation 978900117
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WESTECH COMPANY
Environmental Consulting - Site Permitting
WETLAND DELINEATION REPORT
VERNER AVENUE
JEFFERSON COUNTY, WASHINGTON
January 2008
G. Bradford Shea, Ph.D.
Kim Loafrnan
JRJEClEl{\\l/"'r .T/h
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Submitted to:
JEFFERSON COUNTY
DEPARTMENT OF COMMUNITY DEVELOPMENT
621 Sheridan Street
Port Townsend, Washington 98368
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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: westech@westechcompany.com
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WETLAND DELINEATION REPORT
VERNER AVENUE
JEFFERSON COUNTY, WASHINGTON
January 2008
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
PAGE NO.
1.0 INTRODUCTION
2.0 METHODS
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6
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
3.5 Jefferson County Wetland Map
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4.0 CONCLUSIONS AND RECOMMENDATIONS
4.1 Conclusions
4.2 Recommendations
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5.0 REFERENCES
6.0 TABLES
Table 1. List of Plant Species on the Site
Table 2. Site Soils
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21
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24
FIGURES
Figure 1. Location Map
Figure 2. Vicinity Map
Figure 3. Parcel Map
Figure 4. Aerial Photograph
Figure 5. Site Map Showing Stream and Wetland Locations
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3
4
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APPENDICES
Appendix A - Site Photographs
Appendix B - Wetland Map and Data Forms
Appendix C - Engineering Design Map
Appendix D - Jefferson County Letter
A-1
B-1
C-1
D-1
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1.0 INTRODUCTION
The Property (Site) consists of five parcels of land situated north of Port Ludlow,
Washington in the Olympus Beach Subdivision between Olympus Boulevard and Oak Bay
Road. This area is west of Port Ludlow Bay and south of Mats Mats Bay. The Site is
located in Jefferson County in the SW quarter of Section 4, Township 28 North, Range 1
East, W. M. (Figures 1, 2, 3, and 4). The Property is currently accessed off of Verner
Avenue. Additional Site information is as follows:
Lot Number Parcel Number Size (acres)
1 978900121 3.36
2 978900119 3.36
4 978900118 3.35
5 978900117 3.46
6 978900062 3.85
The landowners, Gerald Lasser and Rae Deane Leatham, have contracted with Westech
Company (Westech) to identify Environmentally Sensitive Areas on the Property to assist
in determining if potential building sites exist on each parcel. A review of Jefferson County
maps indicates that the County mapping of wetlands and streams on the Property does
not appear to be accurate. The County map does not show all of the wetlands on the Site
and a stream is shown that does not exist in that location.
Westech Company has delineated the Environmentally Sensitive Areas on the Property in
order to determine their extent and boundaries. The wetlands were rated and classified
according to type (WDOE 1993). Additionally, associated buffer zones were marked in the
field. Subsequent to this determination, Northwestern Territories, Inc. (NTI) surveyed the
wetland and stream edges as flagged by Westech in order to determine boundary lines
more precisely. Completion of this full Wetland Delineation Report will assist the
landowners in determining the feasibility of developing some or all of the parcels. This
document is intended to satisfy the requirements of Jefferson County Unified Development
Code (Section 3, Land Use Districts, and Subsection 3.6 - Wetlands).
County Assessor's parcel maps and U.S. Geological Survey maps were utilized as base
maps for stream and wetland mapping (Figures 2 and 3). Section 3.0 of this report
contains results of the delineation.
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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 (WDOE 1997).
Wetland rating was accomplished according to the Guidelines of the Washinaton State
Wetlands Ratina System (Western Washinaton) (WDOE 1993). Methods were essentially
those recommended by the U.S. Army Corps of Engineers for Routine On-Site Field
Method of Delineation of Wetlands (ACOE 1987, 1989). Guidelines and requirements of
the Jefferson County Critical Areas Code were applied as applicable (Unified Development
Code, Section 3, Land Use Districts 2001).
Wetlands have many distinguishing characteristics. The most notable features are:
1) the presence of water at or near the surface,
2) hydric soils, and
3) vegetation adapted to or tolerant of saturated soils.
Wetland delineation techniques require observational evidence of the three parameters of
wetland hydrology, hydric soils, and hydrophytic vegetation.
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, 1993). Wetland plant species must
constitute greater than 50 percent of the total vegetation present to meet the qualification
as a site dominated by hydrophytic vegetation.
Soils were determined through field examination. Soils were dug or augured to depths of
up to 18 inches using a wetland shovel and standard augur. Soil consistency was
determined by feeling for grain size and texture. Soil moisture was 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
(redoximorphic features), gley, and other indicators of anaerobic soil oxidation.
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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 B contains data forms for two sample points, one in a
representative upland area on the Site and one from a typical area of the delineated
wetlands. The location of these vegetation, soil, and hydrology plots (VSH) were marked
in the field using wooden stakes tied with blue and white striped flagging.
Wetland boundaries were indicated by use of pink 'Wetland Delineation" boundary
flagging tape tied to wooden stakes or vegetation. Wetlands were staked in field areas by
tying flagging to 24 and/or 48 inch wooden stakes. Wetland boundaries in forested areas
had flagging tied to trees or shrubs as appropriate. All boundaries were staked and/or
flagged every 25-30 feet. Wetland buffer zones were determined based on field
measurements and regulatory requirements, and were marked in the field with orange and
black striped flagging every 30-40 feet.
Specifically, initial field surveys were carried out by Dr. G. Bradford Shea, Mrs. Kim
Loafman, and Mr. James McDougall on May 24, 2007. These surveys included noting
Site characteristics such as hydrology, soil conditions, and identification of plant species
found growing in the area. This Site reconnaissance assisted in identifying characteristics
which are used to identify Environmentally Sensitive Areas (wetlands and streams).
These areas were delineated at this time. Once the wetlands were rated by Westech staff,
Mrs. Loafman and Mr. McDougall returned to the Property on May 31, 2007. It was during
this Site visit that photographic documentation was acquired (see Appendix A) and
measurements were taken so that the buffer zones could be marked in the field for the
regulated wetlands and streams found on-site. Additional fieldwork was carried out in
September, October, and December 2007 by Westech staff in order to identify potential
building areas available for development and to assist NTI lnc's Land Surveying field team
who was mapping the wetland and stream edges as flagged by Westech in order to
determine the precise location of their boundary lines.
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3.0 WETLAND DELINEATION RESULTS
3.1 Existing Conditions
The Site consists of five undeveloped parcels of land. An existing access road off of
Verner Avenue enters the northwestern corner of Lot 6 and runs along the northern
property boundary of that lot. Once the access road reaches the eastern property
boundary of Lot 6, the road turns south. Lots 1 and 2 are on the eastern side of the road
and Lots 6, 5, and 4 (from north to south) are on the western side of the road (Figures 4
and 5). The road terminates at an existing parking area in the southeastern corner of Lot
4. The access road is not paved, but is partially vegetated with various grass species.
Lots 1 and 2 are a mix of open pasture on the west giving way to forested areas on the
eastern side of the parcels. The eastern side of Lot 4 is dominated by shrubs but is
forested to the west. Lots 5 and 6 are primarily forested throughout.
Wetland boundaries were determined by first noting likely areas of topographic and
vegetative distinction between the wetland and uplands. Then the wetland indicator status
of the dominant species was used to determine the presence of hydrophytic vegetation.
Each species' indicator status is defined according to USFWS (1988, 1993). A species'
indicator status refers to the relative frequency with which the species occurs in
jurisdictional wetlands.
Evidence of hydric soils was also checked. These are soils that formed under conditions
of saturation, flooding or ponding long enough during the growing season to develop
anaerobic conditions in the upper layers.
Hydrology is often the least exact of the parameters used to delineate wetland edges, and
indicators of wetland hydrology are sometimes difficult to find in the field. However, it is
essential that a wetland area is periodically inundated or has saturated soils for a sufficient
duration during the growing season. Westech staff noted areas with evident
characteristics of wetland hydrology, places where the presence of water has an
overriding influence on characteristics of vegetation and soils due to anaerobic and
chemically reducing conditions, respectively.
The vegetation, soils and hydrology of the Site are described in detail in the following
subsections. Results of these three factors at two test pit locations are shown in Appendix
B.
Veaetation
There is a diverse assemblage of vegetation on this Property. Table 1 contains a
comprehensive list of plant species found on-site. Over 50 species were recorded during
botanical studies of the area. This is in part due to a variety of habitats that make up this
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Property. There are forested upland areas, grassy fields, sunny and open second growth
areas that were logged in the past, stream corridors, and forested wetlands.
Lot 1 is an open field in the center filled with plantain, western buttercup, perennial
ryegrass, thistle and reed canary grass. A young stand of red alder can be found to the
east and along the southern edge of the parcel.
Lot 2 is an open field with oxeye daisy, perennial ryegrass, bull thistle, reed canary grass,
and small red alders. This pasture is partially fenced and gradually succeeds to forest on
the eastern downhill portion of the parcel.
The eastern side of Lot 4 is vegetated with shrubs and grasses. The western portion is
forested. Lots 5 and 6 are primarily forested with typical of Pacific Northwest species.
The Site vegetation was found to transition from upland to wetland in a relatively distinct
line, although topographic changes are generally less than 1-2 feet between upland and
wetland zones. Red alder, Pacific willow, and western red cedar can be found growing in
the wet areas. Forbs and shrubs consist of facultative and wetland obligate species such
as creeping buttercup, piggy-back plant, salmonberry, and skunk cabbage. Upland areas
are dominated more by western hemlock, big leaf maple, grand fir, and Douglas fir trees
with an understory of sword fern, Himalayan blackberry, Indian plum, and grasses.
Soils
Soils on the Site are of the Alderwood-Sinclair soil association (SCS 1975). These soils
are moderately well drained. They are dominantly strongly sloping to steep, gravelly soils
underlain by compact glacial till. The specific soil types mapped by SCS at the Site are:
· Belfast siltv clav loam. wet variant
This nearly level soil is on flood plains. The upper 20 inches of the soil is
silty clay loam and sandy clay loam. Below this, to a depth of 60 inches, are
dominantly dark-grey or olive-grey, neutral or slightly acid, stratified fine
sandy loams, silt loams, and clay loams. This soil is poorly drained.
Permeability is moderately slow. The soil holds 10 to 12 inches of water
available for plants. A seasonal water table is at a depth of 6 to12 inches.
· Swantown aravellv loam. 0 to 8 percent slopes
This soil has a surface layer of very dark grey and very dark greyish-brown
gravelly loam 10 to 14 inches thick and a subsoil of dark-grey to dark
greyish-brown gravelly loam that has greyish-brown mottles. Below this is a
cemented layer. The soil is medium to slightly acid throughout. Included in
this soil in mapping are small areas of soils that have a surface layer 7 to 10
inches thick and a cemented layer at a depth of 16 to 20 inches.
Permeability above the cemented layer is moderate.
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· Alderwood aravellv sandv loam. 0 to 15 percent slopes
This nearly level to rolling soil is on glacial terraces. In most places the
slope is 5 to 10 percent. Small areas of sandy, very gravelly, or cobbly soils
are included in this soil mapping. This soil is moderately well drained.
Permeability above the cemented layer is moderately rapid. Roots
penetrate to the cemented layer and flatten out on top of it. A perched water
table is above the cemented layer during the winter months. This soil holds
2 to 4 inches of water available for plants. Runoff is slow to medium, and
the hazard of water erosion is slight to moderate.
All three of these soil types are mapped for the Site, with Belfast silty clay loams shown on
the western side, Swantown gravelly loams in the center of the Site, and Alderwood
gravelly sandy loam soils on the eastern portion of the Site. However, field observations
did not fit well with the mapped soil types (see Table 2). The soil samples taken from
wetland areas did not confirm Swantown gravelly loams that the Soil Conservation Service
map indicates should have been found. Instead the wetland soils found consist of black
muck which was moist at the surface. Upland areas sampled were in the mapped
Alderwood gravelly sandy loam portion of the Site. Yet light brown, dry, sandy silt with
some gravel was detected in these areas. The resulting determination is that the soils in
the wetland and upland areas do not closely resemble the mapped subgroups.
Hvdrology
Lots 5 and 6 are relatively level. Lots 1, 2, and 4 have a steeper gradient, sloping downhill
in an easterly direction. Elevation of the Site ranges from 20 to 150 feet above mean sea
level (msl). Topography and drainage influences the hydrology of the Site, resulting in
moist to saturated surface soils in the root zone on the wetland side of the delineated
boundary (although most likely drier during summer months). Site soils were found to be
relatively inconsistent throughout and did not match mapped types for the area. Hydrology
was found to be relatively dry within the wetlands and seasonal streams due to the time of
year.
3.2 Description of Wetlands
Reconnaissance of the Site by Westech staff revealed the presence of several
Environmentally Sensitive Areas on these five parcels (Figure 5). Each of these streams
and wetlands has been delineated in the field. Pink 'Wetland Delineation Boundary" flags
were used to mark the edges of these regulated Environmentally Sensitive Areas. Every
wetland/stream boundary flag is identified with a lot number, followed by a letter and then
a station number. The information provided by this numbering system allowed
Professional Land Surveyors to precisely record boundaries by following the route taken
by Westech staff when delineating these areas.
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There is a wetland on the western portion of Lots 5 and 6, and on the majority of Lot 4.
The wetland on Lot 6 has been given the designation of 6-A in Figure 5 to reflect that the
flags denoting the eastern wetland edge in Lot 6 are labeled 6-A-1 through 6-A-19. The
flags along the western wetland edge in Lot 6 are labeled 6-N-1 through 6-N-13.
On Lot 5 the wetland has been given the designation of 5-J to reflect that the flags
denoting the eastern edge of the wetland are labeled 5-J-1 through 5-J-14. The flags
along the western wetland edge in the northwestern corner of Lot 5 are labeled 5-M-1
through 5-M-3.
The wetland on Lot 4 has been given the designation of 4-8 to reflect that the flags
denoting the eastern wetland edge are marked 4-8-1 through 4-8-14. The first three pink
flags also have yellow and black striped flagging to indicate this area is part of the man-
made ditch which continues on Lot 2. The flags along the western wetland edge in Lot 4
are labeled 4-L-1 through 4-L-7.
For all practical purposes, the wet areas found on Lots 4, 5, and 6 function essentially as
one single wetland and will be referred to as such in this Report. The landowners have
indicated that the septic and drainfield from an adjacent off-site property to the west of Lot
5 influences the wetness of this area. In the open unforested area of Lot 4 which is
nearest the access road, there are slash piles of vegetation left over from logging and
holes 2-3 feet deep that are filled with water. It appears that equipment driven through this
area have compacted the soils, creating wet areas despite the hilly topography of this lot.
Soils sampled in this area revealed dark, moist silt loams with redox features (mottles),
typical of wetland soils.
There is a stream which runs between Lots 4 and 5. The northern edge of this stream was
delineated in the southeastern corner of Lot 5. Flags are labeled 5-C-1 through 5-C-4.
The flags are placed on top of the stream bank approximately 2-3 feet from the Ordinary
High Water Mark (OHWM). This is a 1-2 foot wide, flowing stream which has red
elderberry, salmonberry, red alder, bigleaf maple, sword fern, skunk cabbage, and piggy-
back plant growing along its length. This stream edge was not marked in its entirety
because the stream flared out on Lot 5 and became a wetland based on plants and soils.
Adjacent to the stream are occasional, isolated depressions which are vegetated with
skunk cabbage and common horsetail. However these areas were not included as they
are small enough to be non-regulatory. This stream passes under the existing access
road through a pipe and culvert and continues on Lot 2.
There is a drainage channel on Lot 1. The current landowners have indicated that this
man-made ditch is a curtain drain put in by the previous landowner to aid several septic
systems that had been planned for Lot 1. Appendix C contains the engineering diagram
obtained by the previous landowner for the proposed septic system on Lots 1 and 2. A
letter, dated April 11, 2000, is provided in Appendix 0 that was issued by Jefferson County
Health and Human Services which provides supporting evidence that this ditch on Lot 1 is
a curtain drain and not a seasonal Type 5 stream. The channel bed was dry during May
field visits and had no water flowing through the steep, five-foot banks. Although this ditch
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parallels the road on the western side of the parcel, this section of the ditch was not
delineated as it appeared there was little wetland vegetation growing in this area and
wetland soil characteristics were not present. This ditch has been given the designation of
1-H in Figure 5 to denote that the south side of the ditch as it runs along the northern
property boundary of Lot 1 has pink flags labeled 1-H-1 through 1-H-12. A stand of four-
foot high reed canary grass lies west of this channel. Pink flagging on the other side of
this ditch is labeled as 1-K-1 through 1-K-8. Yellow and black striped flagging has been
added to the pink flagging on both sides of this ditch.
Across the open field located in the center of Lot 1 is another stream (Type 4) along the
southern boundary of the parcel. This stream has water flowing in it and runs downhill to
the east between Lots 1 and 2. This stream originates on Lot 4. On Lot 1, the northern
side of this stream is flagged and labeled as 1-G-1 through 1-G-3. It is labeled as such for
a short distance because it flares out and becomes a wetland. Along the wetland edge on
Lot 1 the flags are marked as 1-1-1 through 1-1-6. This last wetland flag meets up with
stream marker 1-H-12. On the north side of the man-made ditch on Lot 1, the wetland
edge is marked with flags labeled 1-M-1 through 1-M-8. Within the wetland on the eastern
portion of Lot 1 is a small upland area as shown on Figure 5. The western edge of this
upland area has flagging labeled 1-N-1 through 1-N-5.
The southern edge of the stream flowing between Lots 1 and 2 is marked on the Lot 2 side
with flags labeled as 2-E-1 through 2-E-10. This stream is on average two feet wide and is
edged with red alder, common horsetail, and reed canary grass. This stream morphs into
a wetland where soft rush dominates the understory vegetation. The wetland edge in Lot
2 is labeled 2-F-1 through 2-F-10. Although the wetlands on Lots 1 and 2 are
independently marked as 1-1 on Lot 1 and 2-F on Lot 2, these adjacent wetlands function
as one and will be referred to as a single wetland in this Report. This wetland is primarily
forested on both lots with red alder being the dominant species. Salmonberry, soft rush
and reed canary grass can also be found in this area. Dark silty clay soils can be found in
this wetland that slopes down towards Olympus Boulevard.
Also on Lot 2 is a man-made ditch which runs parallel to the existing access road between
Lots 4 and 2. This channel has pools of stagnant standing water. Only the downhill edge
of this drainage ditch was marked. Pink flags are labeled 2-0-1 through 2-0-8.
Additionally, there is yellow and black striped flagging at each of these locations to indicate
it is designated a ditch rather than a stream. This six inch wide trough widens as it goes
north towards the other stream which runs along the northern edge of Lot 2. As it does so,
more Himalayan blackberry encroaches along the edge of this seasonal stream. Based
on topography, it appears that water flowing out of the wetland located on Lot 4 flows
downhill towards Lot 2 where it is intercepted by the north-south channel running parallel
to the road but perpendicular to the drainage flow off of Lot 4. The current landowners
believe and Westech Company concurs that this channel is a man-made feature and not a
Type 5 stream. As it is cross-gradient, it appears it was created to divert water flowing
downhill into what is currently an open field in the center of Lot 2. Neighbors have stated
that this channel was dug by the previous landowners.
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In summation, there are two regulatory-sized wetlands, one stream, and two man-made
ditches found within the boundaries of these five parcels. The location and distribution of
these Environmentally Sensitive Areas is depicted in Figure 5.
3.3 Land Uses and Habitat Values
The Site currently consists of five undeveloped parcels of land ranging from 3.3 to 3.8
acres in area totaling 17.38 acres. The Site is zoned RR-5. This Rural Residential zone
designation allows one dwelling unit per five acres for each parcel. Land use impacts can
play a significant role in determining adequate buffer widths. Wetland function and
sensitivity to disturbance are also attributes that will influence the necessary level of
protection for a wetland.
Wetlands are transitional areas between upland and aquatic environments where water is
present long enough to form distinct soils and where specialized, water-tolerant plants
grow. Wetlands serve a variety of functions such as they transfer surface water into the
ground, thereby recharging groundwater supplies; they trap sediments and pollutants; and
provide stormwater detention, as well as fish and wildlife habitat.
Buffers also have value and are important because they reduce the adverse impacts of
adjacent land uses by stabilizing soil and preventing erosion, filter suspended solids,
nutrients and toxic substances, moderate impacts of stormwater runoff, and reduce noise
disturbance and light intrusion. They can also provide important habitat for wildlife.
The Environmentally Sensitive Areas on the Site appear to provide habitat for both small
and large mammals, as well as birds. Several black-tailed deer were seen on Lots 1 and 6
during Site visits. Rabbit scat was also detected in one of the wetland areas. Several
snags (standing dead trees) along the creek on Lot 5 showed signs of foraging and
nesting cavities for birds such as woodpeckers. Red-tailed hawks forage in the open fields
of Lots 1 and 2. And a common snipe was flushed from the tall grass on the eastern
portion of Lot 1.
3.4 Wetland Types and Buffers
The on-site wetlands were rated by Westech staff according to Washington Department of
Ecology Guidelines (WDOE 1993). In Washington, wetland rating categories are based
on the rarity of the type of wetland, our ability to replace it, its sensitivity to adjacent human
disturbances, and the functions it performs. Wetland ratings are based on:
1) Water Quality Function (Le, Does the wetland have the ability to improve water
quality?)
2) Hydrologic Function (Le., Does the wetland decrease flooding and/or erosion?)
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3) Habitat Function (i.e., Does the wetland provide habitat for many species?)
The objective of the rating system is to divide wetlands into groups that have similar needs
for protection. Buffer widths are tailored to the protection needs of each type of wetland.
Based on our field analysis, we have classified the on-site wetland on Lots 4, 5, and 6 as a
Category II wetland. The wetland on Lots 1 and 2 has also been designated as a
Category II wetland. The location of these wetlands is shown in Figure 5. A 100-foot
buffer for each of the Category II wetlands will be required by Jefferson County's Unified
Development Code (Section 3.6.9).
The perennial stream found on Lot 5 which also flows along the border between Lots 1
and 2 has been classified as a Type 4 stream. This stream will require a 100-foot buffer.
As the channel found on the northern boundary Lot 1 is a man-made ditch (curtain drain)
as indicated by the letter issued by Jefferson County Health and Human Services to
Tillman Engineering (see Appendix C and D), a setback buffer will not be required.
Based on hydrology, topography, and existing drainage patterns, it appears that the ditch
on the eastern property boundary of Lot 2 is a man-made feature. The landowners have
received background information on the parcel through reliable first-hand accounts from
neighbors who state that they have witnessed the digging of the stream channel by Lot 2's
previous owners. As the ditch does not appear to be a natural feature, it should therefore
be exempt from the 50-foot buffer requirement required on Type 5 streams. The 100-foot
buffer from the Category II wetland to the west on Lot 4 extends to the eastern side of the
ditch, providing some measure of protection to this waterway.
Buffers have been identified in the field using orange and black striped flagging placed at
the appropriate distance from the wetland or stream edge. This setback has been marked
approximately every 30-40 feet. Flagging is tied to wooden stakes in open areas or
attached to vegetation in forested areas. No filling, grading, clearing, alteration or
disturbance to the land or vegetation is allowed within wetlands or along streams or their
associated buffers without a Variance approved by Jefferson County.
3.5 Jefferson County Wetland Map
Jefferson County Critical Areas mapping indicates the Site does contain Environmentally
Sensitive Areas (Jefferson County 2007). The County's map shows a large wetland of
unknown size south of Mats Mats Bay that is present on several parcels to the north of the
Lasserl Leatham property and overlaps the eastern portion of Lots 1 and 2 (see Critical
Areas Map in Appendix B). While this wetland does exist on parts of Lots 1 and 2, it
appears that this wetland is not as extensive as shown. Westech Company staff
investigated the area from Olympus Boulevard and determined that the remaining area
consists of houses and lawns, although there are a couple of small ponds that mayor may
not be regulatory at these locations. The location of this wetland on Lots 1 and 2 is
depicted in Figure 5.
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Additionally, the County map shows a Type 5 stream running north-south on the western
side of Lots 5 and 6. Extensive investigation of the Site has revealed that a stream
oriented in that direction in this location does not exist.
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4.0 CONCLUSIONS AND RECOMMENDATIONS
4.1 Conclusions
The 17.38 acre Site encompasses five undeveloped parcels. Westech Company's field
reconnaissance has revealed the presence of several Environmentally Sensitive Areas on
the Property. Two Category /I wetlands and one Type 4 stream (originating in part from a
Type 5 tributary) have been identified on-site. The location and extent of these
Environmentally Sensitive Areas is depicted in Figure 5. The wetlands and Type 4 stream
each require 1 DO-foot buffers as per Jefferson County's Unified Development Code.
Additionally, two man-made ditches can be found on the Property. This information will
assist the landowners in assessing the amount of remaining land that is available for
development.
It is Westech Company's determination that three or possibly four potential building sites
exist located on various parcels. Our map (Figure 5), based in part on NTI's survey
results, shows their approximate location. It appears that the upland area on the eastern
portion of Lot 6 would be of sufficient size to develop. Lot 5 has a small upland area in the
northeast corner of the parcel. However it is unlikely that there is enough room on Lot 5 to
place a single-family residence, drainfield and septic system. There is a large upland area
on the west central portion of Lot 1. Additionally, there is a smaller upland area on Lot 1
northeast of the man-made ditch (curtain drain). Lot 2 has a potential building site as well
but access to that region would require a Variance to place an access driveway over the
man-made ditch and through Lot 4's associated wetland buffer which extends onto Lot 2.
4.2 Recommendations
We recommend that the landowners evaluate the potential options available to them for
developing these parcels. One avenue which could be pursued to facilitate development
involves buffer averaging whereby buffer reduction in one area is compensated for by an
equal increase in buffer size in another area. This would increase the amount of space
that is available to be developed. Buffer Averaging may be possible on Lots 1 and 6.
Other options include pursuing Variances to Jefferson County's Unified Development
Code. Westech Company also advises the landowners to work with a Land Surveyor or
Engineer to investigate the option of adjusting existing property lines to divide up the lots
differently. A lot line adjustment may possibly increase the amount of easily accessible,
usable areas.
Westech Company recommends that building permits be approved for the property as per
the provisions of the Jefferson County Unified Development Code provided the homes,
driveways, and associated drainfields are placed entirely outside the buffer zone in
buildable upland areas. No structures, grading, excavating, filling, draining or other
activities which may adversely affect wetlands or streams may be carried out in these
areas or in their buffer zones without a variance granted by Jefferson County.
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A construction fence (silt fence or equivalent erosion control measure) should be
emplaced between the construction area and the buffer zones for the Environmentally
Sensitive Areas prior to construction or the area should be immediately reseeded following
grading. Silt fence placement should be based on topography and runoff potential from
the construction site to the Environmentally Sensitive Areas and their associated buffer
zones as delineated and described in this Report and as staked by Westech Company in
the field. Grading activities should not take place after November 1 without all possible
erosion control measures in place.
Other standard drainage and erosion control measures should be undertaken in
accordance with Jefferson County regulations (Jefferson County 2001). Such measures
would include placement of straw bales or similar control devices at the downhill edge of
construction area and spreading straw or jute netting (or similar measures) over exposed
soil areas.
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5.0 REFERENCES
Cooke, S.S. 1997. A Field Guide to the Common Wetland Plants of Western Washinoton
and Northwestern Oreoon. Seattle Audubon Society. Seattle, Washington.
Guard, J. 1995. Wetland Plants of Washinoton and Oreoon. 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. 2007. Online Map Database. Accessed June 2007.
httpllmaps.co.jefferson.wa. usANebsite/parcels/viewer.htm. Jefferson County,
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.
Jefferson County Health & Human Services letter from Linda Atkins RS., Environmental
Health Specialist, to Eric Page of Tillman Engineering regarding application for on-
site sewage disposal system on Lot 1 (SEPOO-00010, #978-900-121). April 11 ,
2000. Port Townsend, Washington.
Lyons, C.P. 1997. Wildflowers of Washington. Lone Pine Publishing. Renton,
Washington.
Microsoft Corporation. 2000. Microsoft MapPoint Interactive Mapping Software.
Redmond, Washington.
Munsell Color. 1994. Munsell Soil Color Charts. Gretag Macbeth. 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.
Tillman, R Ryan. 2007. Engineering Drawings. Port Hadlock, Washington.
U.S. Army Corps of Engineers (ACOE). 1987, 1989. Federal Manual for Identifying and
Delineatino Jurisdictional Wetlands. U.S. Government Printing Office. Washington,
D.C.
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U.S. Fish and Wildlife Service (USFWS). 1988, 1993. National List of Species that Occur
in Wetlands: Reaion 9 (and Supplement). Biological Report 88(26.9). Portland,
Oregon.
U.S. Geological Survey. 1953. Quadrangle Map of Port Ludlow, Washington. Published
1953, Photorevised 1973, Scale 1:24,000. Denver, 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). 1997. Washinaton State Wetlands
Identification and Delineation Manual. Publication #96-94. Olympia, Washington.
Washington Department of Ecology (WDOE). 1993. Washinaton State Wetlands Ratina
System: Western Washinaton. Second Edition. Publication # 93-74. Olympia,
Washington.
Wildflower Productions. 1998. TOPO Olympic Peninsula. San Juan Islands and Puaet
Sound: Olympics. San Francisco, California.
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TABLE 1. LIST OF PLANT SPECIES ON THE SITE
Common Name
Scientific Name
Upland Vegetation
Grand fir
Western hemlock
Douglas fir
Bigleaf maple
Holly
Indian plum
Himalayan blackberry
Red elderberry
Trailing blackberry
Sword fern
Red huckleberry
Orchard grass
Oceanspray
Dandelion
Foxglove
Cleavers
American vetch
Thimbleberry
Bracken fern
Bull thistle
Fringe cup
Tall fescue
Oxeye daisy
Perennial ryegrass
Red clover
White clover
Evergreen blackberry
Herb Robert
Canada thistle
Abies grandis
Tsuga heterophylla
Pseudotsuga menziesii
Acer macrophyllum
/lex aquifolium
Oemleria cerasiformis
Rubus discolor
Sambucus racemosa
Rubus ursinus
Polystichum munitum
Vaccinium parvifolium
Dactylis glomerata
Holodiscus discolor
Taraxacum officinale
Digitalis purpureum
Galium aparine
Vicia americana
Rubus parviflorus
Pferidium aquilinum
Cirsium vulgare
Tellima grandiflora
Festuca arundinacea
Leucanthemum vulgare
Lolium perenne
Trifolium pratense
Trifolium repens
Rubus laciniatus
Geranium robertianum
Cirsium arvense
Indicator *
UPL
FACU
FACU
FACU
FACU
FACU
FACU
FACU
FACU
FACU
FACU
FACU
UPL
FACU
FACU
FACU
UPL
FACU
FACU
F ACU+
FACU
FAC-
UPL
FACU
FACU
FACU
F ACU+
NI
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 = No Indicator (a
species for which there is insufficient data to provide an indicator determination), ORN =
Ornamental.
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TABLE 1. LIST OF PLANT SPECIES ON THE SITE, continued
Common Name
Hydrophytic Vegetation
Western red cedar
Red alder
Pacific willow
Mountain ash
Reed canary grass
Nootka rose
Common horsetail
Creeping buttercup
Lady fern
Salmonberry
Piggy-back plant
Western coltsfoot
Skunk cabbage
Western buttercup
Soft rush
Velvet grass
Willow species
Miner's lettuce
False lily of the valley
Stinging nettle
Small flower forget-me-not
Purple-leaved willow-herb
Beaked sedge
Rib plantain
Scientific Name
Thuja plicata
Alnus rubra
Salix lucida
Sorb us spp.
Pharis arundinacea
Rosa nutkana
Equisetum arvense
Ranunculus repens
Athyrium filix femina
Rubus spectabilis
Tolmiea menziesii
Petasites frigidus
Lysichiton americanum
Ranunculus occidentalis
Juncus effusus
Holcus lanatus
Salix spp.
Claytonia perfoliata
Maianthemum dilatatum
Urlica dioica
Myosotis laxa
Epilogium ciliatum
Carex utriculata
Plantago lanceolata
Indicator *
FAC
FAC
FACW+
NI
FACW+
FAC
FAC
FACW+
FAC
FAC+
FAC
FACW-
OBL
FAC
FACW+
FAC
FAC
FAC
FAC
FAC+
OBL
FACW-
OBL
FAC
*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 = No Indicator (a
species for which there is insufficient data to provide an indicator determination), ORN =
Ornamental.
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TABLE 2. SITE SOILS
Location/Depth
Tvpe
Color
Value/Chroma
Plot # VHS-1 (Wetland)
0-6" Muck
6-12" Muck
12-18" Muck
Black
Black
Black
2/1 (10YR)
2/1 (10YR)
2/1 (10YR)
Plot # VHS-2 (Upland)
0-6" Sandy silt
6-12" Sandy silt with gravel
12 -18" Sandy silt with gravel
Light brown
Light brown
Light brown
3/4 (10YR)
3/4 (10YR)
3/4 (10YR)
*Value/Chroma readings are from comparison of field samples with Munsell Soil Color
Charts.
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APPENDIX A
SITE PHOTOGRAPHS
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1) View of Lot 1.
2) Man-made ditch (curtain drain).
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3) Lot 2 facing east.
4) Man-made ditch located on Lot 2.
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~\1~~ ,(
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6) View from road/parking area between Lots 2 and 4 facing east towards Lot 2.
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7) View of Lot 4 facing west.
8) View of Lot 4.
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APPENDIX B
WETLAND MAP AND DATA FORMS
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APPENDIX C
ENGINEERING DESIGN MAP
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APPENDIX D
JEFFERSON COUNTY LETTER
WW1 052VAWO.APPO/01 0808/xmk 0-1
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Dee 14 07 11:238
Gerald I.ass8r Rae 0e8na L
425742 1178
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(I FOR YOUR IN'POIRMA'l'ION
(X I r...EASE RESiONl>
(I I'D ycua RE(tJI:ST'
~ate: Apri: Ll, 2COO
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To: ERIC PAGE EIT
TILJ..KAN !:NG.
Address: POBOX :375
PORT HADLOCK NA 98339
Fram~inda Atkins R.S.,Environmental Health Speci&lis~
Jefferson Ooanty Health Depar~t
SUbjec;;: Bernard Partnership Lot 1
SEPOO-OOOIO 1978-900-121
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Messaqe:
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On January 21, 2000 this office received an application for an
onsite lNW&qe disposal system for the above referenced site
tor a three-bedroom residence.
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As per our telephone conversation early in llarch the followinq
items are requixed in order to proceed with review:
1. ':he arainage cl1tch to the west of the drainfielci site was
'.ruJ1:1ing water during all wet season observations and on
Karch 7, 2000. This constitute15 a sur::ace water ana
requires a 100' setback frOAl the disposal portion of ~
system. My unaerstandinq was that the ditch was to be
cievelopeci as a C'.:rtail1 drain atter the water table levels
were established o~ the site.
2. The diameter of the laterals does not match in the
calculations and the table in the construction plans.
Additionally I have not yet received the IJigaoff from
Development Review for Critical areas. The owner has been
notified. Please autlllit :evisions to the l?enait center .so
that review of ~e project may eo::'1tlnue. Pl.ase contact this
o~fiee at 385-9444 if you have further questions.
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Cc
Bernard PartnerShip
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tEALTH
DEPNmENT
3IOI38H4OO
ENVlAONMENTAL
Hl!AL TH
3IQI3IIH444
DEVELOPMENTAL
0ISA8IUTIES
3IOj3II5 8.00
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AI..COHOLJOAUG
A8lJSE fAX
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WN1 052VAWO.APPO/01 0808/xmk
0-2