HomeMy WebLinkAboutHabitat Management Plan 978900016t,
WESTECH COMPANY
Environmental Consulting - Site Permitting
MITIGATION AND HABITAT MANAGEMENT PLAN
460 OLYMPUS BOULEVARD dEftkHSIIN COUNTY gGfll
ASSESSOR'S PARCEL # 978-900-016
JEFFERSON COUNTY, WASHINGTON
v �� �
x�.+?
"°' w# ,
April 2016
G. Bradford Shea, Ph.D.
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
email: bmd(@westechcompany.com
MITIGATION AND HABITAT MANAGEMENT PLAN
460 OLYMPUS BOULEVARD
ASSESSOR'S PARCEL # 978.900-016
JEFFERSON COUNTY, WASHINGTON
April 2016
G. Bradford Shea, Ph.D.
Copyright 2016 by G. Bradford Shea, Westech Company -All Rights Reserved
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
CONTENTS
CHAPTERISECTION PAGE NO.
1.0
INTRODUCTION
1
1.1 Background
1
1.2 Proposed Project
1
1.3 Regulatory Framework
1
2.0
APPROACH AND METHODS
7
2.1 Approach
7
2.2 Methods
7
3.0
MITIGATION PLAN
10
3.1 Regulatory Setting
10
3.2 Existing Conditions
12
3.3 Project Impacts
13
3.4 Plan Components
15
3.5 Detailed Mitigation Measures
15
3.6 Implementation and Timing
16
3.7 Mitigation Monitoring
16
3.8 Contingency Plan
18
4.0
PLANTING PLAN
19
5.0
CONCLUSIONS AND RECOMMENDATIONS
23
5.1 Conclusions
23
5.2 Recommendations
23
6.0
CERTIFICATION
25
7.0
REFERENCES
26
TABLES
Table 1. List of Native Plants for Buffer Mitigation and Enhancement
21
FIGURES
Figure 1. Location Map
2
Figure 2. Vicinity Map
3
Figure 3. Parcel Map
4
Figure 4. 2015 Aerial Photograph
5
Figure 5. Site Map
8
Figure 6. Planting Areas A, B and C
20
APPENDICES
Appendix A — Site Photographs
A_1
W W 1473-OlympusBlvd HM P.TOC/041216fmas
1.0 INTRODUCTION
1.1 BACKGROUND
The Property (Site) is located at 460 Olympus Boulevard in Jefferson County
Washington. The Property is owned by Thomas Balzarini (3535 South 126' Street,
Seattle, Washington 98168). It is recorded as Assessor's Parcel # 978-900-016.
The Site fies within Jefferson County, Washington in Section 4 of Township 28
North, Range 1 East, W.M. (Figures 1, 2, 3, and 4). The Site is located at the
northern end of Port Ludlow on the western shore of Hood Canal and Port Ludlow
Bay in unincorporated Jefferson County, Washington.
The property is about 178 feet long by 61 feet wide or 0.25 acres. The Parcel has a
six to eight (6-8) foot high bank above Port Ludlow Bay and Admiralty Inlet, with a
cobble -sand beach at the foot of the bank. The bank slopes back at a relatively
steep angle from the Ordinary High Water Mark (OHWM) and there is set of stairs
to the beach. An existing pathway provides access to the property from Olympus
Blvd. Parking is along Olympus Blvd. and there is another residence between
Olympus Blvd., and the property (450 Olympus Blvd.)
1.2 PROPOSED PROJECT
The property currently contains a one story house (cabin) with an irregular T-
shaped footprint (roughly 616 square feet) with a 124 square foot covered porch
(Rankin 2015). There is an existing septic system which will be replaced (Martin
2015).
Planned construction activities include demolition of the existing house (one -
bedroom cabin) and construction of a new two-bedroom home on the approximate
location of the existing structure. The new home will be roughly 40x50 (1668
square feet), with a 652 square foot wooden deck (Rankin 2015). A new drainfield
area will be constructed west of the new house (away from the water). Stormwater
drainage pipes will be as per the engineered Drainage Plan for the Site (Zenovic &
Associates 2016). This plan is shown on Figure 5. It includes use of a silt fence
during construction and tight -lining and energy dissipation for stormwater runoff.
This is further discussed in Sections 3.0 and 5.0.
1.3 REGULATORY FRAMEWORK
The marine shoreline along this Property is considered a Shoreline of Statewide
Significance and has been designated as critical habitat for Hood Canal Summer
Chum and Puget Sound Chinook (50 C.F.R. 226). The shoreline is classified as a
"Fish and Wildlife Habitat Conservation Area" (FWHCA) by Jefferson County,
normally requiring a 150 foot buffer from the OHWM.
W W1473-OlympusBlvdHMP.RPT/041116/mas
I
n
�,
yf N.
�� S
N ,
L
�_
W
F
WW
{�`
(�
C
j
o
��
3
v��
a.
Lz
-y
f
�
_
ry
-�
� ��
/
��
a P
a
i
i l—__
� ..
�
L`
U�
f � •
d�'
_
�i
.
,;'
^:.
v
i ,.�
/m'
fE
4 fYj
�
"i
\m 0
L
�_
u
00
c
Ir
It is the intention of the owner to demolish the current residence on-site and replace
it with a new, larger residence on roughly the existing footprint location within the
150 foot shoreline buffer. The house will have an expanded footprint to the
northeast and southeast, with a new deck area east of the residence (footprint
expansion of about 1,250 square feet for the residence and an expansion of 500
square feet for the deck). The new residence will lie at a distance of about 75 feet
from the OHWM and the deck will extend to about 55 feet from OHWM.
The owner has a septic permit SEP15-00112 for the septic system upgrade, with a
drainfield area west of the house. The Septic system will be upgraded as per
conditions of the permit and the Jefferson County Health Department.
Because of the proposed home expansion and septic and storm -drainage
construction, the Project will disturb surface soils and some existing vegetation.
Stormwater drains will be placed as specked in the drainage plan (Zenovic &
Associates 2016). The Property owner's engineer has contracted with Westech
Company (Westech) to satisfy the County's requirements in regards to Critical
Areas and Shoreline Buffer Requirements through preparation of this Habitat
Management Plan.
This Report constitutes a Habitat Management Plan (HMP) which will describe
existing conditions on the Site, define the impacts of development, and outline a
management proposal to maintain and enhance the existing functions and values
of the buffer and its associated watershed and to ensure "No Net Ecological Loss of
Shoreline Functions" (RCW36.70A.480). This document is intended to satisfy the
requirements of pertinent Jefferson County and State regulations and ordinances.
W W1473-0IympusBNdHMP.RPT/0411161mas
2.0 METHODS
2.1 APPROACH
The approach for this investigation into the impacts of development of this Site
included a detailed review of County Assessor's parcel maps, Critical Area Maps,
aerial photographs of the Site, mapped locations of Species of Concern by the
Washington State Department of Fish and Wildlife, mapped locations of ESA
(Endangered Species Act) listed species' critical habitat by NOAA-NMFS (National
Marine Fisheries Service) and topographic maps of the area. A Site Plan prepared
by Zenovic & Associates (2016) was also reviewed and utilized to help define
proposed planting areas (see Section 3.3 and Figure 5).
During April 2016, the proposed home design with the current planned septic
locations and stormwater drainage features were reviewed (Jefferson County
Public Health 2015; Zenovic & Associates 2016)). An architectural plan for the Site
(Rankin 2015) was also reviewed, as was a geotechnical report by Zenovic &
Associates (2010).
Westech's field investigations for the Habitat Management Plan (HMP) were carried
out in March 2016 by Dr. G. Bradford Shea, Principal Ecologist. During Site visits,
the Property was inspected and Site characteristics were noted. Relevant
measurements were taken for mapping purposes, photographic documentation of
the Site was acquired, and potential mitigation was identified. Updated plans and
studies cited above were reviewed by Dr. Shea during March and April 2016.
2.2 METHODS
Westech's field reconnaissance involved examining the existing conditions found at
the Site. This included reviewing the area proposed for development in relation to
the natural features found on-site. Botanical studies were conducted involving
identification of plant species that could be found growing at the Site. Site
measurements were taken (including dimensions of proposed planting areas) using
fiberglass and steel tape measures.
A qualitative assessment of the landscape was conducted to determine the
presence of invasive species, the composition and characteristics of plants in the
critical area, evidence of historical land uses, the slope of lands adjacent to critical
areas, soil textures and stability and an assessment of the role of existing
vegetation in supporting soil stability. Westech also assessed the extent of existing
human disturbance in the critical areas. This information was used to assess the
potential impacts of the proposed project.
WW 1473-OlympusBlvdHMP.RPT/041116/mas
va A 02�P
I niV SIIYI:%KS\rJ vc
R)110NI w �
�
� ¢,
t
a'
14-ON-1
..
IS
�\ I18.LN-
g�
o
�
n
-
mn.ay."n"�.m.w. ou. ry un w
m
m
L6
AM
ILL
This HMP has been formulated to assure "no net ecological loss" and to "maintain
or enhance the existing functions and values of the associated watershed" (JCC
18.22.480; RCW36.70A.480). Chapters 3.0 and 4.0 describe the goals and
objectives of this HMP as well as the performance standards that will be utilized to
assess the effectiveness of this plan. This Plan is intended to restore and enhance
the integrity of the Site by improving the quality of habitat and erosion control
through planting of additional native vegetation at the Site. These
recommendations have been formulated to be implemented in accordance with
recommendations for erosion control by Zenovic & Associates (2010, 2016).
VWV1473-0 ympusBWHMP. RPT/041116/mas
3.0 MITIGATION PLAN
3.1 REGULATORY SETTING
There are several jurisdictional issues related to the development of this parcel of
land. The Site is a medium -low bank site (6-8 feet at top of bank), with gradual
uphill topography to an elevation of about 45 feet above mean sea level (msl).
The steep bank hillslope above the beach slopes back sufficiently (about 35-45
degrees) to be well covered with vegetation, mostly shrubs and herbaceous
species. The area in front of the proposed home is moderately sloped (15-25 %)
for a distance of 30 feet to the forward edge of the proposed deck. The proposed
residence addition is located approximately 55 feet from the top of bank and
about 75 feet from MHHW.
The Site is zoned Rural Residential (RR -5). The purpose of rural residential
zoning is to allow for "continued residential development" in areas of the County
of "relatively high density pre-existing patterns of development," including "along
the County's coastal areas" (JCC 18.15.015). "In addition, this district seeks to
support and foster Jefferson County's existing rural residential landscape and
character by restricting new land divisions to a base density of 1 unit per 5 acres"
The Site is located along a section of shoreline that is considered a "Shoreline of
Statewide Significance" and is regulated under Jefferson County's Shoreline
Master Program. This shoreline has been designated under the Shoreline
Master Program as a suburban "Shoreline Residential (SR)" shoreline (Jefferson
County 2016a,b).
Shoreline Residential (SR) is a shoreline designation which "is assigned to
shoreline areas landward of the Ordinary High Water Mark (OHWM) if they do
not meet the criteria for natural, conservancy, or high intensity environments" and
"if the shoreline is predominantly high density (RR1:5) single family or multifamily
residential development or is planned and platted for high density (RR1:5)
residential development."
The permitted activities in these areas include single family homes (and normal
appurtenances) (JCC 18.25.220). Under the Shoreline Master Program the
standard set -back for residential structures is "30 feet" or one foot per foot of
bank height, whichever is greater." This set -back is to be measured from the
bank's edge when the bank height is greater than 10 feet and shall not exceed
100 feet. The elevation of the bank at this property is approximately 6-8 feet of
moderately steep bluff. The property grades upward to a maximum height of
about 45 feet at the southern property line.
WW1473-01ympusB1vdHMP. RPT/041116/mas 10
The underlying Site soils are considered stable in terms of shoreline stability.
The site is mapped by the County as a landslide hazard area, however, there are
no seismic or erosion hazard areas on the property (Jefferson County 2016).
The Geotechnical Report (Zenovic & Associates 2010) indicates that the
mapping of the Site as a Landslide Area is not accurate. Erosion is rated as low
provided the Site remains sufficiently vegetated.
This shoreline has been designated "critical habitat' for threatened salmonid
species, specifically the Puget Sound Chinook and Hood Canal Summer Chum.
This listing comes from the National Marine Fisheries Service (NMFS) pursuant to
the Endangered Species Act (ESA). The Growth Management Act
(RCW36.70A.480) mandates that the County protect such critical areas.
Jefferson County carries out this mandate by classifying this shoreline as a "Fish
and Wildlife Habitat Conservation Area" (FWHCA). These areas are considered
to be of "critical importance to the maintenance of endangered, threatened or
sensitive species of fish, wildlife, and/or plants' (18.22.200).
Jefferson County requires a buffer of 150 feet from the Ordinary High Water Mark
(OHWM) for areas in which "federally listed species have a primary association."
In addition, a ten foot building setback from the buffer is required. Local and site
specific factors may be taken into account and the buffer width is to be "based on
the best available information concerning the species/habitat in questions' (JCC
18.22.270(2)). Any project located within this buffer must follow Jefferson County
drainage and erosion control, grading and vegetation retention standards (JCC
18.22.270).
Landowners may obtain a reduction in the size of the buffer required for
FWHCAs. The administrator has the "authority to reduce buffer widths on a case-
by-case basis" provided that standards are met for avoiding and minimizing
impacts and that the buffer reduction does not "adversely affect the habitat
functions and values of the adjacent FWHCA or other critical area" (JCC
18.22.270). However, the administrator may not reduce the buffer to less than
75 percent of the standard buffer (JCC 18.22.270). Any projects that "alter,
decrease or average the standard buffer" require an accompanying Habitat
Management Plan (HMP) (JCC 18.22.265).
Because this project involves elements to be built in the buffer area, on an
existing footprint, an HMP is required to mitigate and offset any adverse
ecological effects. This document is also the best way to meet the intent of
RCW36.70A.480 which provides for Jefferson County to make a determination of
"No net loss of ecological functions" with or without mitigation, for renovation of
existing shoreline structures. This document includes a "No Net Loss" ecological
evaluation, proposed Mitigation Measures to offset impacts and a Habitat
Management Plan to assure long-term health and ecological productivity of the
buffer zone.
WW1 473-01yrnpus3 lvd H M P. RPT/041116/mas 11
These documents (HMPs) must include maps showing the proposed
development Site and its relationship to surrounding topographic features; the
nature and density of the proposed development; and the boundaries of forested
areas. The report shall also describe the density and nature of the proposed
development in enough detail to allow analysis of impacts on identified fish and
wildlife habitat. The report must describe how any adverse impacts resulting from
the project will be mitigated.
Possible Mitigation Measures for an HMP may include, but are not limited to,
establishing buffer zones, preserving plant and tree species, limiting access to
habitat areas, seasonally restricting construction activities and establishing a
timetable for the periodic review of the Plan (18.22.440).
3.2 EXISTING CONDITIONS
The Site is located roughly 1.5 miles north of Port Ludlow in unincorporated
Jefferson County. The land area of the parcel is approximately 178 feet long
(average) by 61 feet wide. The entire parcel is approximately 0.25 acres in size.
Parking is along Olympus Boulevard and there is no direct vehicular access to the
property.
Figure 5 shows topographic features on the Site and the proposed development.
The parcel abuts a sand -cobble beach to the east. The bank rises 6-8 feet on a
relatively steep bluff, with the parcel rising to 45 feet msl on its southwestern corner.
The property presently supports a small residence and septic system, bordered by
lawn and a mixture of native and non-nafive shrubs.
The shoreline adjacent to the property has been designated as critical habitat for
two species listed as threatened under the Endangered Species Act: Puget Sound
Chinook and Hood Canal Summer Chum (50 C.F.R. 226).
The house area is characterized by low grasses (lawn area), however a few native
trees, mainly Douglas fir (Pseudotsuga menziesit) and western red cedar (Thuja
plicata) are present along the northern property border. Other, non-native species
include ivy and Himalayan blackberry. Small red alder (Alms rubra) trees are
present along part of the shoreline area and other large shrubs are present
adjacent to the residence including rhododendron (Rhododendron spp.) and sword
fern (Polystichum munitum). Ocean spray (Holodiscus discolor), salal (Gauttheria
shallop) and salmonberry (Rubus spectabilis) are also present on the site.
W W 1473-0Iympusl3lvdHMRRPT/0411161mas 12
The Natural Resource Conservation Service (NRCS) has mapped one dominant
soil on the upland portion of the Site (NRCS 2016) plus beaches. Because NRCS
maps can be inaccurate at this scale it is not possible to determine the actual
boundary between these soils or the specific soils among these that are found on-
site. These soils include:
Coastal Beaches. This soil is usually very well drained (sand, gravel
and cobble) and has a depth to water table of about 0 - 72 inches. It
has a high frequency of flooding. It consists of sands and gravels to a
depth of 72 inches. These soils are subject to influence of tides and
storm waves.
Alderwood gravelly sandy loam — 0-15 percent slopes (AIC) and 15-
30 percent slopes AID. These are moderately well -drained soils
formed on terraces and hillslopes above glacial till at depths of 23-60
inches. These soils are moderately well drained above the till and
drainage is very slow within it. Runoff is medium to rapid. Hazard of
water erosion is slight to moderate.
The Site has coastal beach soils at the eastern edge, with most of the Site
underlain by Alderwood soils. These soils tend to be dominant along this area of
Admiralty Inlet.
3.3 PROJECT IMPACTS
The landowner's plan for this Property entails the expansion of the existing house
footprint following demolition and removal of the existing structure (Figure 5). The
project also involves new stormwater drainage replacement of the existing septic
system within the area west of the house as per the current County septic permit
(Jefferson County 2016c).
The primary impacts associated with this project are those generally associated
with construction. Figure 5 is a map of the existing and proposed structural footprint
on the Site.
The existing house including front deck. The proposed structure will
be built on the footprint of 1868 square feet as shown, and will not
extend significantly further waterward than the front of the existing
house.
A 652 square foot deck will be located on the east side of the main
residence. This will replace the existing 124 square That covered
porch.
WVV1473-OlympusBlvdHMP.RPT/041116/mas 13
The current septic tank will be replaced by three tanks located
beneath the new deck, as shown in the septic plan (Martin 2015) and
as approved by the Jefferson County Health Department (Jefferson
2016c).
The reserve drainfield required by the County will be located west of the residence
and north of the new main drainfield area (Martin 2015).
The potential impacts of this project will result primarily from the processes of
grading and clearing the areas for construction of the new home and septic system.
These potential impacts include the following:
The area surrounding the new home and the area near the storm -
drainage pipes will be cleared. Also, the drainfield area will need to
be cleared. This may create the conditions for potential short-term
erosion and soil instability caused by the construction process and
the removal of some vegetation in the buffer (mostly lawn area and
existing shrubs). Additional earth moving and grading during the
construction process may contribute to increased erosion.
The removal of some native vegetation in the buffer zone. Native
vegetation has already been removed near the structures and
replaced by native grasses and lawn. More will be removed in order
to replace the existing house, replace drainage pipes, and replace the
drainfield. There may be soil impacts from the movement of
construction equipment vehicles on the Site.
The project will increase the impervious surface on the Site. The
overall footprint of the house is expected to increase by about 1,250
square feet. The deck will be permeable and will not affect the
amount of impervious surface.
The historical removal of native vegetation from the Site has already
resulted in the direct loss of some habitat. Many species of bird, small
mammal and insect use native plants for food sources and refuge.
Further loss of vegetation in the buffer zone could reduce habitat for
these organisms.
The Management Plan below is intended to offset these adverse impacts. The
Mitigation Measures developed in this Plan are intended to compensate for the
impacts to the shoreline habitat and buffer zone.
VJW1473-OlympusBlvdHMP.RPT/041116/mas 14
3.4 PLAN COMPONENTS
The components of the Mitigation Plan include the following:
Erosion control methods will be used to prevent on -Site rill or sheet
erosion from moving sediments toward the adjacent shoreline. This
will be accomplished through project timing and emplacement of
control measures during construction. A sift fence will be placed on
the edges of the construction area, adjacent to the construction
envelope and between the construction and the shoreline (see
Zenovic & Associates 2016). The large trees along the northern site
boundary which do not interfere with construction will be retained.
Native vegetation will be planted in two main areas, one area east of
the new house and one area near the residence to mitigate
disturbance to existing plants in the buffer zone. The drainfield area
will be revegetated using native grasses.
No nutrients, pesticides or other contaminants will be used within 100
feet of the shoreline.
3.5 DETAILED MITIGATION MEASURES
The detailed Mitigation Measures corresponding to the Plan Components listed
above are as follows:
Timing of construction, as feasible, should be limited to the "dry
season" between May 1 and September 30. By limiting construction
to this time period, less effort will be required to inhibit erosion and silt
runoff.
All graded areas should be covered or re -vegetated prior to
November 1. If it is necessary to continue construction into the "wet
season," then extra measures will be required for erosion and silt
runoff control as per recommendations by Zenovic & Associates
(2010 and 2016).
All erosion control measures should be installed prior to beginning
grading or other ground -disturbing construction activities. A silt fence
will be placed between the residence structure and the beach. This
should be kept in place until plantings and new grasses have become
established. Straw bales, jute netting or other material should be
kept on -Site and used to stabilize open areas following grading.
W W 1473-OtympusBlvdHMP.RPT/041116/mas 15
Three areas within the buffer zone will be re -vegetated with native
plant species as per the Planting Plan described in Chapter 4.0 in
order to reduce future erosion and enhance buffer function. Planting
success will be monitored and will conform to performance standards
as described in Sections 3.6 and 3.7. If performance standards are
not met, additional plantings or other remedial actions will be taken to
meet standards as per requirements in Section 3.7. Large conifers
along the northern site boundary will be retained.
Implementation of these Mitigation Measures is anticipated to
mitigate impacts associated with the further development of the Site
and disturbance to the buffer zone. However, the narrow size of
buffers at this site and the limited filtering capacity of sandy soils will
limit the extent to which the Site will filter long-term pollution and
sediments entering the adjacent waters. To minimize the potential for
contaminants to enter these waters, no additional nutrients,
pesticides or additional contaminants should be used on the Site
within 100 feet of the OHWM.
3.6 IMPLEMENTATION AND TIMING
The continuation of construction on the Site should be conducted between May 1
and September 30 as feasible, in order to minimize ground -disturbing activities
during the rainy season. Any work carried out during the rainy season should have
all erosion control measures in place prior to beginning.
New plantings in the buffer zone should be carried out during early fall if possible
(September -October) to avoid the necessity of supplemental watering. Plantings
can be placed during the winter or early spring (March -May) if necessary. If
plantings occur during summer months, supplemental watering with a drip irrigation
system or equivalent method may be necessary. Westech recommends that
monitoring of plantings be conducted by a landscaping firm, certified arborist,
registered nursery or qualified botanists and that success of plantings be
maintained above a performance standard of 90 percent (see Section 3.7).
3.7 MITIGATION MONITORING
Buffer areas serve a variety of functions. They are important in that 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.
W W1473-olympu$BlvdHMP.RPT/041116/mas 16
The narrow size of buffers at this Site (about 75 feet from OHWM to the house) and
the limited filtering capacity of sandy, gravelly soils limit the extent to which the
Mitigation Measures will fitter pollution and sediments from ongoing activity. This
can include pollutants from hydrocarbons, heavy metals, pesticides and fertilizer.
Literature on buffer size indicate that buffers of 100 feet may be necessary to
consistently filter sediments and pollution that occur in stormwater runoff (Wenger
1999, Mayer at al. 2005).
Precluding the use of pesticides, nutrients and other potential contaminants within
100 feet of the OHMW will limit the impact of these pollutants on nearshore critical
habitat. The literature also indicates that plantings can increase the effectiveness of
the buffer zone, or decrease the size needed to filter contaminants.
Because buffer zones serve several functions, it is important that the Mitigation
Measures that are implemented to offset significant impacts are successful.
Monitoring over an extended period of time provides the best assurance of
success. Monitoring success of erosion control measures during construction will
be carded out daily during construction. Any evidence of erosion or sedimentation
leaving the construction area (particularly during or after stone events) will result in
immediate action to block erosion and sediments. Such siltation can be blocked
through the use of additional silt fences, straw bales, wattles, or temporary berms.
Monitoring the success of new native plants (as per the Planting Plan described in
Section 4.0) should be carried out and enforced by the County according to the
following schedule and performance standards:
Following construction, the areas shown in the Planting Plan (Section
4.0) should be replanted.
The coverage of replanted native vegetation should remain at 90
percent of the original area planted. If monitoring indicates that viable
vegetation drops below this level in the planting areas, contingency
measures must be implemented.
The homeowners should have a monitoring report prepared by a
qualified professional at the and of the first growing season. Follow-
up monitoring reports should be completed at the end of the second
and third full years after construction and restoration. These reports
should address the success of the plantings. Any plant mortality
should be noted and corrected if plant survival falls below 90 percent
during the first three years. Documentation should include any
necessary corrective measures that include supplemental planting to
compensate for plant mortality and notation of the apparent reasons
for such mortality.
All reports should be submitted to Jefferson County for review and concurrence.
W W1473-OlympusBlvdHMP.RPT/041116/mas 17
For this plan to be successful, the County must monitor compliance with its
conditions. The failure of the County to monitor the implementation of the Plan may
lead to its ineffectiveness.
3.8 CONTINGENCY PLAN
A Contingency Plan should be prepared and followed if Mitigation Measures appear
to be failing. This plan, if necessary, should address any mortality affecting
revegetated areas having plant survival below the 90 percent level at the end of any
season during the three year monitoring period. Should this performance level not
be met, the Contingency Plan should include an assessment of the reasons for
failure by a qualified botanical professional and the plan should include the
introduction of plants likely to be successful in the location where performance
standards were not met.
WW1473-OlympusBlvdHMP.RPT/041116/mas 18
4.0 PLANTING PLAN
A Planting Plan as diagrammed in Figure 6 will be implemented to mitigate for the
disturbance of native vegetation in the buffer areas. Plantings have been proposed
to offset construction of the drainfield area and for work on storm drainage. A list of
native plants that will be used for mitigation and restoration can be found in Table 1.
Revegetation and planting of additional vegetation will occur as an integral part of
the Project to compensate for environmental impacts caused by the ground -
disturbing activity.
Most of the area immediately adjacent to the location of the proposed residence
expansion, stormwater pipe replacement, and septic system modification is grassy
lawn and shrubs. New native grass -seed mixture should be used to replant the
construction area upon completion of the new house, where stormwater drainage
work will occur and where the new septic drainfield area will be placed, upon
completion of those activities. The areas designated for additional plantings
include:
Planting Area A is a 30 foot by 50 foot area adjacent to and landward
of the existing Top of Bank on the east side of the parcel. The area is
presently covered by low-cut mixed grasses and forbs (lawn). This
area should be planted with the mix of shrubs and ground cover
found in Table 1. Plants may be clustered so as to leave one
pathway to the bank and beach.
Planting Area B is an approximately a 9 foot by 50 foot area that will
be planted south of the house. This area is presently vegetated by
mixed grasses, (orbs and shrubs which will be removed during
construction. This area should be planted with a mix of selected low
shrubs and groundcover (Table 1). These plants should be planted
in similar patterns as Area A.
Planting area C will be the 28 foot by 43 foot area where the new
dreinfleld will be installed. This area will include planting of a native
grass seed mix to minimize erosion and enhance the buffer zone.
Success of the planting plan depends on choosing species that are suitable to both
the on -Site soil conditions, but that are hardy and capable of handling nutrient poor
soils, shading and some salt spray. The native vegetation selected for this
Mitigation and Habitat Management Plan were chosen for these reasons.
W W1473-OlympusBlvdHMP. RPT1041116/mas 19
ss
N N
T N
N N
d V
E o
U �+
otS
ss
ta� 7A '1 N
8.)IAONI
WEI
.c � ,�6�n ! �a� bei �z z•�#X s � �g c
z
u Od
n ppn cy m
iIF3 E
N` �i Cryy
./ \., yr. ag rn / $€pE r•` me espy nye �r� LL
`Y• �� � � � sly •Sad 4 &., .e:G rh
_451fi444
\ , aASI
.. 6§ K ApApp 'fYQ §9pp ��z#easpp
SjI VI.'kISCV7
ix %
wa iiusrv;
r
L�
i4
q'
,,,€fff���ppp`r*
i'�\QV..�.j�
-pN l
k
pfiflT ;v dMfanl)»� a�R3.0
TABLE 1. LIST OF NATIVE PLANTS FOR
BUFFER MITIGATION AND ENHANCEMENT
Location
S ecies
Scientific Name Number
Size
A
Salal
Gaultherin shallon
5
1 gallon
A
Oregon Grape
Mahonia nervosa
12
4"
pot
A
Bracken fern
Pte» dfum a utlinum
15
1 gallon
A
Snowberry
S m horocar us albus
12
1 gallon
A
Red Elderbeny
Sambucus racemosa L
10
1 gallon
A
Indian Plum
Oemleria cerasiformis
8
1 gallon
A
Sword fern
Polys Urn mumitum
20
1 gallon
.._
B
Salal
Gaultheriashallon
10
1 gallon
B
Kinnikinnick
Aro
10
1 gallon
B
Vine Maple
mva-ursi
A
5
1 gallon
B
Oceans ra _ _ _
- -
Holodiscus discolor
8
1 gallon
B
C
L
Sword fern
Nativegrass seed mix
Polystichum mumitum
Grarmnae
5
20
1 gallon
--oounds
VWJ1473-01ympusB1vdHMP Tabl/641216/mas 21
Soils on the Site are mostly gravelly loams and sandy gravelly loams which are
moderately well drained. Normal rainfall will quickly drain through these soils. Plants
may require additional watering during the first year or two in order to meet
performance criteria. A simple drip irrigation system would be the most effective
method of accomplishing this.
The species, size and number of plants that will be used to revegetate these areas
is shown in Table 1. Plants will be placed in a semi -random fashion within the areas
indicated in Figure 6. Large trees, where recommended, should be placed on 10 -
foot centers. Small trees will be placed on eight -foot centers (oceanspray and
Indian plum) and shrubs will be planted on six-foot centers or less. Staggering of
plants, rather than planting in straight rows, will create a more natural appearing
configuration. Plants may be clustered by species in order to promote natural
reseeding.
Plants installed in the fall usually out -perform those installed in the late winter or
spring. Planting projects scheduled for early October to mid-December are
generally the most successful. The earlier plants go into the ground in the fall, the
more time they have to recover from transplant shock, adapt to the site, and
expand their roots systems before the growing season. They will require less water
and grow more vigorously than if they are planted in the spring. To increase the
potential for 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.
VWJ1473-OlympusBlvdHMP.RPT/041116/mas 22
6.0 CONCLUSIONS AND RECOMMENDATIONS
5.1 CONCLUSIONS
The property presently contains an existing home, with a covered porch (deck), and
septic-drainfield system, within the buffer zone. The residence will be replaced by
demolition of the existing residence and construction of a 1,868 square snot home
roughly on the existing footprint. A new pervious deck (652 square feet) and a new
septic system and drainfield will also be added.
The property owner also intends to construct storm water drainage lines adjacent to
the house as recommended by Zenovic & Associates 2016). Replacement of the
existing septic system will be made as per the septic permit issued by Jefferson
County. The proposed project is being constructed inside the buffer zone, though
the proposed structure will be only slightly closer to the shoreline than has
previously been the case (roughly 75 feet from OHWM).
Measures outlined in this report will be enacted to mitigate additional construction
on the Site and incrementally improve habitat and vegetation in the nearshore area.
Erosion control measures will include a sift fence and other standard measures and
will be used during construction to minimize sheet and rill erosion (see also Zenovic
& Associates 2010, 2016). A Planting Plan (See Figure 6 and Table 1) will be
implemented to provide additional vegetation adjacent to the shoreline, and south
of the house. Also, ivy and any other invasive, non-native plants should be
removed from the buffer zone.
This report and associated Habitat Management Plan meets the intent of
RCW36.70A.480 ensuring "No Net Loss of Shoreline Ecological Function" due to
the Mitigation proposed, and applicable Jefferson County Codes.
5.2 RECOMMENDATIONS
This report constitutes a Mitigation and Habitat Management Plan. A Planting Plan
has been included in this report and we recommend that it be implemented on the
Site upon approval by the County. Benefits deriving from this Plan will only take
place if it is implemented by the property owners and enforced by the County.
The silt fence should be emplaced prior to construction and should be left in place
throughout construction. Additional erosion control materials should be kept on
Site to address any erasion observed during construction.
The Planting Plan outlined in this report should be implemented. The Plan should
be monitored according to the instructions outlined in this report and the
Contingency Plan implemented in the event that plant survival in the revegetated
areas falls below 90 percent.
W W1473-OlympusBlvdHMP.RPT/041116/mas 23
Property owners should refrain from the use of pesticides or additional nutrients on
the Site and should introduce no contaminants within 100 feet of the OHWM. While
these measures will provide mitigation for additional construction and use of the
Site, the shoreline and marine critical areas may experience continued cumulative
impacts as a result of the narrow size of the buffers and limited filtering capacity of
the soils in this area.
WVV1473-olympusBlvdHMP. RPT/0411161mas 24
6.0 CERTIFICATION
I, the undersigned, certify that the infonnatlon contained in this Mitigation and
Habitat Management Plan for Assessor's Parcel #978-900-016 in Jefferson County,
California located at 460 Olympus Boulevard, Port Ludlow, Washington is true and
correct to the best of my knowledge and professional judgment. The project has
been performed by myself and other staff and associates of Westech Company.
Dr. G. Bradt rd Shea, Principal Dat€
Senior BiologistfEcologist
vvW1473-01ympus61vdHMP.RPT10411161mas 25
7.0 REFERENCES
Google Earth. 2016. Online mapping software. www.googleearth.com.
Imagery date April 19, 2015. Europa Technologies.
Jefferson County. 2016a. Online Map Database. http://vrww.co.jefferson.wa.us/.
Jefferson County, Washington.
Jefferson County Shoreline Master Program. 2016b. Shoreline Master Program;
Chapter 16.25. www.codepublishinci.com.
Jefferson County. 2016c. On -Site Sewage Disposal Permit. Permit # SPE15-
00112. Jefferson County Public Health Department. Port Townsend,
Washington.
Jefferson County. 2012. SPAADSite Plan Approval Advanced Determination for
Residential Development. Jefferson County DCD. Port Townsend,
Washington.
Jefferson County. 2009. Jefferson County Critical Areas Code. Title 18.22 JCC.
Department of Community Development. Port Townsend, Washington.
Hitchcock, C.L. and A. Cronquist. 1973. Flora of the Pacific Northwest. University
of Washington Press. Seattle, Washington.
Lyons, C.P. 1997. Wildflowers of Washington. Lone Pine Publishing. Renton,
Washington.
Martin, D. 2015. On -Site Sewage Disposal System, Site Plan. David Martin,
Licensed Designer. Plans and specifications. Jefferson County,
Washington.
Mayer, P.M., S.K. Reynolds, and T.J. Canfield. 2005. Riparian Buffer Width,
Agency.
Natural Resource Conservation Service (NRCS). 2016. Web Soil Survey.
http://Websoilsurvey.nrcs.usda.gov/app/HomePage.htm
Pojar, J. and A. MacKinnon. 1994 (reprinted 2004). Plants of the Pacific Northwest
Coast. Lone Pine Publishing Company. Redmond, Washington.
Rankin, J.L., Architect. 2015. Site plans for 460 Olympus Boulevard, Port Ludlow,
Washington. Normandy Park, Washington.
WN1473-01ympus131WHMP.RPT/041116/mas 26
Revised Code of Washington. 2016. RCW36.70A.480. Shoreline of the State.
hftp://apps/leg.wa.pov/rcw/defau ft.aspix?cite=3670A.480.
Taylor, R. 1995. Northwest Weeds. Mountain Press Publishing Company.
Missoula Montana.
Wegner, S. 1999. A Review of the Scientific Literature on Rioarian Buffer Width.
Extent and Veoetabon. Athens, Georgia, Institute of Ecology, University of
Georgia.
Zenovic & Associates. 2016. Drainage Plan for SFR at 460 Olympus Boulevard,
Jefferson County Parcel 978-900-016. Designed for Thomas Balzarini. Port
Angeles, Washington.
Zenovic & Associates. 2010. Geotechnical Review Report for Property at 460
Olympus Blvd. Mats Mats Bay Area, Jefferson County, Parcel No. 978-900-
016. Stephen M. Zenovic, P.E. PortAngeles, Washington.
W W1473-0IympusBlvdHMP.RPTtO41116/mas 27
APPENDICES
WJtl1473-OlympusBlvdHM P. RPT/041116/mas 28
APPENDIX A
SITE PHOTOGRAPHS
W W1473-Olympu$BlvdHMP.APPA/041210/mas A-1
.. �rffl
W W1473-OlympusBIVdHMP APPA/041216/mas A-3