HomeMy WebLinkAboutHMP and FEMA Floodplain Assessment - HMP Habitat Managment Plan - 6/4/2021r
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Dewatto Bulkhead Replacement
Tah uya, Washington
Prepared for
Frank Dahl
22 Dale Court
Massatequa, New York 11758
(516) 761 6820
Prepared by
Ecological Land Services
1 157 3rd Avenue, Suite 220A • Longview, WA 98632
(360) 578-1371 • Project Number 3407.01
TABLE OF CONTENTS
INTRODUCTION ....................................................................................................................................2
MASONCOUNTY SHORELINE MASTER PROGRAM......................................................................................2
SITEDESCRIPTION.................................................................................................................................2
DEVELOPMENT PROPOSAL......................................................................................................................3
Constructionmethods.............................................................................................................. 3
Geotechnical Recommendations.............................................................................................. 3
ENVIRONMENTALAND HABITAT CONDITIONS............................................................................................4
ShorelineEnvironment............................................................................................................. 4
State and Federally Listed Species and Critical Habitat........................................................... 4
Washington Department of Fish and Wildlife, Priority Habitats and Species ......................... S
Mason County Critical Area and Habitat Mapping.................................................................. S
Washington Department of Ecology, Coastal Atlas................................................................. S
Research and Site Investigation............................................................................................... 5
BufferFunctions....................................................................................................................... 6
MITIGATION SEQUENCING......................................................................................................................6
IMPACTANALYSIS.................................................................................................................................7
ShorelineImpacts..................................................................................................................... 7
Shoreline Buffer Impacts.......................................................................................................... 8
CumulativeImpacts.................................................................................................................. 8
NoNet Loss Evaluation............................................................................................................. 8
SHORELINE MITIGATION PLAN................................................................................................................9
SPECIFICATIONS FOR PLANTING.............................................................................................................. 9
PlantMaterials......................................................................................................................... 9
PlantingSpecifications........................................................................................................... 10
MaintenancePlan .................................................................................................................. 10
MonitoringPlan...................................................................................................................... 11
ContingencyPlan.................................................................................................................... 11
FEMA FLOODPLAIN HABITAT ASSESSMENT............................................................................................12
Habitat Narrative Primary Constituent Elements.................................................................. 12
Primary Constituent Elements................................................................................................ 12
WaterQuality......................................................................................................................... 13
WaterQuantity...................................................................................................................... 13
Vegetation Communities and Habitat Structures.................................................................. 13
FloodplainRefugia.................................................................................................................. 13
FLOODPLAINHABITAT EFFECTS DETERMINATION......................................................................................13
LIMITATIONS......................................................................................................................................14
Frank Dohl—Dewatto Bulkhead Replacement Ecological Land Services,Inc.
Shoreline No Net Loss and Mitigation Report i June 4,2021
REFERENCES.......................................................................................................................................15
TABLES
Table 1:State and Federally Listed Endangered and Threatened Species and Critical Habitat
Table 2. Priority Habitats and Species
Table 3. ImpactAnalysis
Table 4. Plant List
FIGURES& PHOTOPLATES
Figure 1 Vicinity Map
Figure 2 Existing Conditions
Figure 3 Proposed Conditions
Figure 4 Construction Access
Figure 5 WDFW Priority Habitat and Species Map
Figure 6 Mason County Critical Areas
Figure 7 Coastal Atlas Map
Figure 8 Coastal Shoreline Photo
Figure 9 Impact Analysis
Figure 10 Planting Plan
Photoplates Site Photos
Frank Dahl—Dewatto Bulkhead Replacement Ecological Land Services,Inc.
Shoreline No Net Loss and Mitigation Report ii June 4,2021
SIGNATURE PAGE
The information and data in this report were compiled and prepared under the supervision
and direction of the undersigned.
Laura Westervelt
Biologist
April Fleming
Biologist
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report 1 June 4,2021
INTRODUCTION
Ecological Land Services, Inc. (ELS) has been contracted by Frank Dahl to conduct a no net loss
assessment (NNL) that addresses potential impacts associated shoreline armoring improvements
at 890 Dewatto Beach Drive, Tahuya, Washington. The project area consists of two lots, a
residential shoreline lot and an adjacent undeveloped shoreline lot, Mason County Tax Parcel
Numbers 323283100110 and 323283100080, that lie in a portion of Section 28, Township 23
North, Range 3 West of the Willamette Meridian (Figure 1). The project is located within the
200-foot shoreline jurisdiction and requires completion of the no net loss report to satisfy the
requirements of Mason County Code, Title 17.50, Shoreline Master Program (MCCSMP).
Mitigation sequencing is required to address the potential impacts associated with replacing the
bulkhead and to achieve no net loss of buffer function and habitat for the shoreline community.
MASON COUNTY SHORELINE MASTER PROGRAM
This project is being reviewed under the updated MCSMP that was adopted in 2017 because it is
within 200 feet of the shoreline of Hood Canal. The entire project area lies within 200 feet of the
shoreline, so it is under shoreline jurisdiction and requires a no net loss report under Mason
County Shoreline Master Program (MCSMP). The required buffer width is 150 feet, which
extends to the middle of the two lots, beyond where the existing house is located. Under the
current administrative process, projects proposing construction of structural shoreline
stabilization must complete a shoreline report to document existing conditions and show that
there will be no net loss of buffer function per Section 17.50.340 of the MCSMP.
SITE DESCRIPTION
The site is composed of two adjacent lots, one developed with a single-family residence, the
other undeveloped, located at the end of NE Dewatto Beach Drive in the Tahuya area of Mason
County, Washington (Figure 1). They are long, rectangular lots that extend northwest across NE
Dewatto Beach Drive to the shoreline Hood Canal (Figure 2). The lots slope down from southeast
to northwest. Both lots are forested on the southeast end and the eastern lot is developed on
the northwest side of NE Dewatto Beach Drive with a single-family residence near the shoreline.
A gravel parking area is located at the top of the slope above the residence with stairs leading
down the slope to the terrace the residence is on and continues to the shoreline (Photoplates 1
to 3). The western lot is undeveloped and slopes down to a terrace adjacent to the parking area
and then slopes down again to the beach. A landslide occurred on this lot in 2019 (Photoplates 2
and 3).
The east side of the site contains a rip rap and creosote log bulkhead that ends along the western
property line and does not extend onto the west side of the site (Photoplate 2). Properties to the
east are similarly developed with homes near the water with armored shorelines. The beach
slopes gently to the water and is comprised of unvegetated cobble and shells with some
driftwood occurring at the OHWM (Photoplate 2).
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The site has a shoreline environmental designation of Shoreline Conservancy and require a 150-
foot shoreline buffer which extends from the OHWM of Hood Canal and covers most of the site,
extending past the existing residence and NE Dewatto Beach Drive. The developed portion of the
buffer consists of residential development and impervious surface made up of decking, roof,
paved walkway and stairs. There are some areas of ornamental vegetation on the south side of
the existing residence and are considered part of the developed portion of the eastern lot.
The west half of the site contained a mix of native and invasive vegetation on the slope where the
landslide occurred. Vegetation on the slope was composed of native upland shrub vegetation
with scattered ferns and English ivy.
DEVELOPMENT PROPOSAL
The proposal involves replacing approximately 50 feet of deteriorating creosote log bulkhead
with rip rap and constructing approximately 40 feet of new rip rap bulkhead at the toe of the
shoreline slope on the west half of the site. The replacement and construction of bulkhead is
necessary to prevent continued erosion from further degrading the slope adjacent to and under
the house (Coastal Solutions 2021) (Figure 3). In order to do so, equipment will be brought in
from the upland and along the beach east of the project area (Photoplate 4). Woody debris will
be stockpiled nearby while the bulkhead is constructed. The drainage onsite will not be
changed. Once is complete, woody debris will be placed back in front of the bulkhead.
Construction methods
In order to install the new rip rap bulkhead, construction equipment will be brought down from
the upland to the east and driven along the beach to access the site (Figure 4). Work will be
performed during the window at which forage fish are least likely to be spawning (August 1st to
February 15th). There are areas of sand lance mapped on this section of beach (Figure 5). If work
must be performed outside of this window, forage fish surveys will be conducted to determine if
forage fish eggs are present. Work will not begin until it is confirmed that there is no active
forage fish eggs or larvae on the stretch of beach that will be impacted.
Upon completion of the new bulkhead and woody debris has been replaced, the excavator will
be driven back off the beach and leave the site through the upland beach access east of the site.
Beach nourishment in the form of washed gravel of similar size to the existing substrate will be
spread over the beach where the excavator disturbed the surface. The beach will quickly return
to pre-construction conditions because no marine vegetation will be impacted.
Geotechnical Recommendations
The geotechnical analysis indicated that there is limited structural integrity of the creosote log
bulkhead leaving it at high risk of being breached (Coastal Solutions 2021). It is therefore
recommended that a new rock bulkhead be constructed to "...provide a more predictable
erosion control structure..." and "...protect the existing upland features at the site." The
bulkhead is recommended to be placed landward of the MHHW and at or near the OHWM.
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ENVIRONMENTAL AND HABITAT CONDITIONS
Shoreline Environment
This site is located along the east side of Hood Canal (Figure 1). This section of shoreline is
composed of cobble beach with oyster shells (Photoplate 2). Maps obtained for this project
indicate the presence of patchy fringe eelgrass in this section of Hood Canal, but none was
observed in the wrack during the site visit (Ecology 2014) (Figure 7).
This section of shoreline is composed of developed residential lots with nearly 100 percent
armoring along the OHWM consisting of log, rip rap and concrete bulkheads that extend east
along the shoreline (Photoplates 2 and 4). There is no armoring to the west for several hundred
yards. The east side of the site is armored, and the west side of the site is not (Figure 2)
(Photoplate 2). The bulkheads on the properties to the east are constructed of rock (Photoplate
2). These bulkheads appear to have been constructed waterward of the OHWM.
State and Federally Listed Species and Critical Habitat
State and federally listed species found within or near the site included salmonid species, rock
fish species, and birds. Habitat features are available for the federally listed endangered,
threatened, or sensitive species in the vicinity of this project except for listed bird species
(USFWS/NOAA Fisheries 2021). None of the species identified during online research were
observed during the site visit conducted on February 17, 2021.
Table 1: State and Federally Listed Endangered and Threatened Species and Critical Habitat
Species, ESU'or DPSZ State Status4 Federal Critical Habitats in
Status Project Vicinity
Puget Sound ESU
Candidate Threatened Yes
Chinook Salmon (Oncorhynchus tshawytscha)
Hood Canal Summer-run Chum salmon
Candidate Threatened Yes
(Oncorhynchus keta)
Hood Canal Steelhead DPS
Dolly Varden (Salvelinus confluentus) Threatened Threatened Yes
Bull Trout(Salvelinus confluentus) Candidate Threatened Yes
Puget Sound/Georgia Strait DPS
Candidate Threatened Yes
Yelloweye rockfish (Sebastes ruberrimus)
Puget Sound/Georgia Strait DPS
Bocaccio(Sebastes paucispinis) Candidate Endangered Yes
Birds
Marbled murrelet
Threatened Threatened No
(Brochyramphus marmoratus)
Yellow-billed Cuckoo
Candidate Threatened No
(Coccyzus americanus)
Streaked Horned lark
(Eremophila alpestris strigata) Endangered Threatened No
1)ESU-Evolutionarily Significant Unit. A distinct group of Pacific salmon.
2)DPS—Distinct Population Unit.
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Species,ESU1 or DPSz State Status° Federal Critical Habitats in
Status Project Vicinity
3) Endangered - In danger of becoming extinct or extirpated; Threatened Likely to become endangered within the
foreseeable future throughout all or a significant portion of its range and that has been formally listed as such in the Federal
Register under the Federal Endangered Species Act; Sensitive - Vulnerable or declining and could become Endangered or
Threatened in the state; Species of Concern - An unofficial status, the species appears to be in jeopardy, but insufficient
information to support listing. State candidate species include fish and wildlife species that the Department will review for
possible listing as State Endangered, Threatened, or Sensitive. A species will be considered for designation as a State
Candidate if sufficient evidence suggests that its status may meet the listing criteria defined for State Endangered,
Threatened,or Sensitive.
4)Washington Department of Fish and Wildlife,PHS website
5)NOAA 2019,USFWS 2019
Washington Department of Fish and Wildlife, Priority Habitats and Species
The Washington Department of Fish and Wildlife Priority and Habitat and Species (PHS) website
(WDFW 2021) identifies the presence of hardshell clams along this section of Hood Canal (Table
2). There is also breeding areas for Pacific sand lance mapped along with the presence of
Pandalid shrimp and waterfowl concentrations (Figure 5) (Table 2). Estuarine and marine
wetlands are mapped within this portion of Hood Canal; however, none were observed on or
near the site. No terrestrial habitat or wildlife occurrences are mapped on this or the adjacent
lots.
Table 2. Priority Habitats and Species
Common Name Species Name Type
Pacific Sand Lance Ammodytes personatus Breeding Area
Hardshell Clam Mercenaria mercenan.a Presence
Pandalid Shrimp Pandalus spp. Presence
Waterfowl Concentrations -- Presence
Estuarine and Marine Wetland -- Aquatic Habitat
Mason County Critical Area and Habitat Mapping
The Mason County Critical Area Maps tool maps the FEMA 100-year floodplain to the toe of the
shoreline slope (Figure 6). It also maps high geo-hazard on the shoreline slope. The mapped
floodplain unit extends from the shoreline of Hood Canal to the toe of the shoreline slope (Figure
6). This portion of the floodplain is composed of a gradual sloping beach with no marine
vegetation.
Washington Department of Ecology, Coastal Atlas
The Washington Department of Ecology (Ecology 2014), Coastal Atlas Mapping tool identifies
patchy eelgrass fringe in this section of Hood Canal (Figure 7). No other significant features were
noted on the coastal atlas map.
Research and Site Investigation
Fish
Hood Canal is part of the Puget Sound, so it provides habitat for listed fish species appearing on
Table 1. The cobble beach is un-vegetated and the wrack did not contain any vegetation debris.
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Driftwood was found along the beach at the toe of the shoreline slope. The shoreline ba
nk is
sparsely vegetated with immature native trees and shrubs that provide some shading of the
shoreline at the toe of the slope (Photoplate 2). There is tree canopy providing shade over the
floodplain section of the shoreline during the morning hours.
Birds
Research conducted for this project shows that the site is not within habitat or management
areas for marbled murrelet, streaked horned lark, and yellow-billed cuckoo (IPaC 2021). The
upland along this section of Hood Canal is developed with residential homes within 10 feet of the
shoreline. There are no habitat features or known habitat for the listed bird species on or in the
vicinity of this project area. The trees on the lot may be utilized by local raptor species including
bald eagles.
Buffer Functions
The project area lies within Shoreline Conservancy designation and is zoned Rural-Residential,
which allows 1 dwelling unit per 5 acres. The eastern lot within the project area is residentially
developed. Lots to the east are also residentially developed and have bulkheads on the beach.
Vegetation on the shoreline slope is composed of native shrubs and a madrone tree. The grade
of the shoreline slope is also a factor which reduces the ability of the buffer to slow and infiltrate
runoff before reaching the shoreline.
The width of buffers necessary to protect a critical area from degradation is related to the
functions of the critical area and the buffer itself (Castelle, et al. 1992). Buffers function to
protect water quality of critical areas including shorelines by removing sediment and excess
nutrients from runoff and the function depends on the type of soils, vegetation, and
characteristics of the runoff. The function of buffers is also based on width and slope. The
buffer function on this site is a result of historic residential use and natural topography. Adding
native vegetation will serve to shade the floodplain and prevent further erosion of the slope.
MITIGATION SEQUENCING
This project area lies within the 200-foot shoreline jurisdiction of Hood Canal. Rock armoring
techniques are proposed near the OHWM. As part of the mitigation process, projects are
required to address mitigation sequencing to assess whether the project can avoid, minimize,
rectify, or reduce impacts before identifying compensation or mitigation measures.
In order to accommodate the proposal for work on the beach, the project must address
potential impacts to the shoreline environment and 150-foot buffer. Sediment recruitment is
expected to be reduced by installing a bulkhead at the toe of an actively eroding bluff. Removal
of the dilapidated creosote log bulkhead and removal of invasive English ivy will improve the
habitat function of the buffer. By planting native species on the slope, maintaining woody
debris, and nourishing the beach with washed gravel, the project achieves a no net loss of
shoreline and buffer functions.
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Avoiding Impacts: The project proposes to replace a failing creosote bulkhead with rip rap and
construct a new rip rap bulkhead in order to prevent erosion and structural failure. The new
bulkhead will be placed landward of the OHWM, which avoids new impacts to the intertidal area.
Filter fabric and quarry spalls will be placed between the rock and exposed soil, which avoids
erosive and stormwater impacts to the shoreline from upland runoff. Work will be prioritized
during late summer when forage fish are not spawning to avoid impacting their breeding habitat.
Should work commence during spawning season, the project will follow WDFW work windows
and spawning inspections will be utilized for approval of work.
Minimizing Impacts: The project is minimizing impacts by proposing to replace an existing
bulkhead in the same footprint and locating the new bulkhead landward of OHWM. Work
windows will also minimize impacts to forage fish spawning and habitat. Work will be performed
during the work window opening for the site, which is August 1 through February 15. Performing
work during this work window will limit the impact of the project on protected salmonid species
because forage species are less likely to be using this section of shoreline during this period.
Excavating equipment will be brought in from the upland.
Rectifying the Impacts: The project rectifies some temporary construction impacts by removing
the creosote log bulkhead from the beach and planting the upland slope. The project cannot
rectify all impacts associated with a new bulkhead.
Reducing or Eliminating the Impacts: The project cannot reduce or eliminate the impacts by
preservation and maintenance.
Compensating for the Impacts: The project cannot avoid, rectify, or reduce the impact to the
shoreline buffer but has minimized the impact to the extent possible by proposing to replace a
failing creosote log bulkhead. The replacement rip rap bulkhead and new rip rap bulkhead will be
placed landward of the OHWM, avoiding impacts to the intertidal area. The shoreline will be
restored where excavation impacts the substrate surface. Once construction activities are
completed, the shoreline buffer will return to pre-construction condition with the
implementation of the restoration plantings.
IMPACT ANALYSIS
Shoreline Impacts
The shoreline of Hood Canal will be temporarily impacted by onsite construction activities
because the equipment will disturb the beach substrate near the OHWM. Constructing a rip rap
bulkhead serves to better dissipate and slow wave action which causes toe erosion and threatens
the house. The shoreline bluff currently deposits sediment onto the beach which will be
eliminated with the addition of the bulkhead. Removing the old creosote log bulkhead will be a
positive impact on available habitat. There will be no impact to the shoreline buffer or upland
vegetation because work will be performed from the beach. No upland vegetation removal is
expected to occur and there will be no marine vegetation impact because the beach is
unvegetated. Woody debris that is scattered around the OHWM will be retained and replaced
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upon completion of construction. By adding beach nourishment to the area as needed, sediment
recruitment should be maintained, achieving a no net loss of function.
Noise generated during construction, which will include use of equipment and workers to install
the rock, may temporarily influence use of the shoreline environment by wildlife species. This
area is already developed and there is noise currently generated by adjacent homes. There will
likely be an increase in noise generated during construction, but once construction is completed,
noise will return to current levels.
Shoreline Buffer Impacts
The project proposes to replace a dilapidated creosote log bulkhead with a rip rap bulkhead and
extend it to the west along the currently unarmored portion of the project area. The buffer is
currently comprised of residential development so impacts or loss of function to the buffer will
be minimal with implementation of the mitigation plan. The project will only temporarily
increase the amount of noise and light generated on this lot but will return to normal post-
construction. With mitigation, water quality onsite will not change, the lot will not generate any
new pollutants or sediments that will have a negative impact on the shoreline environment. It
will also not change the conditions or use of the area.
Cumulative Impacts
The eastern side of the site currently has shoreline armored with a rip rap bulkhead and a
creosote log bulkhead while the shoreline on the western side of the site is unarmored. The
creosote log bulkhead is failing and at risk of being breached and the western side of the site is
actively eroding, threatening the residence. Replacing the creosote log bulkhead and building a
new rip rap bulkhead along the unarmored portion of the site is proposed above MHHW and at
or near OHWM. Driftwood will be temporarily relocated until construction is complete. Drift
cells may be altered by installation of the rock bulkhead. Habitat availability will not be
permanently altered because no vegetation will be removed, and woody material will be moved
back into place upon completion of construction. Sediment recruitment will be reduced by
armoring the toe of an actively eroding feeder bluff, but regular addition of washed beach
nourishment will serve to mitigate this impact. Installing a new rock bulkhead on a natural
shoreline bank will result in cumulative impacts, however,the house needs to be protected and a
rock bulkhead is the only feasible option.
No Net Loss Evaluation
Because the project proposes to construct a new bulkhead in addition to replacing the old
log/timber bulkhead and leaving the rip rap bulkhead, planting of native vegetation is proposed
to achieve no net loss of buffer function of the shoreline environment. Creosote material will be
removed from the beach to reduce contamination and 200 square feet of invasive English ivy will
be removed from the slope.
During construction activities, best management practices will be utilized to protect the shoreline
environment. The project will take place during the dry season to minimize rain events, which
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move exposed soils. Exposed soil will be protected from wind and rain during the construction
process. The replacement and new bulkhead will be installed above the OHWM. Table 3
describes the impact area in terms of temporary and permanent impacts from construction.
Upon implementation of the mitigation plan, the project may result in a net gain of habitat
availability (Table 3).
Table 3: Impact Analysis*
Temporary Permanent Invasive Mitigation Area Net Habitat Gain
Impacts Impacts Removal
520 sq ft 180 sq ft 200 sq ft 600 sq ft 920 sq ft
*Numbers are estimated and approximate
SHORELINE MITIGATION PLAN
The project proposes to plant 600 square feet of shoreline buffer to compensate for 180 square
feet of new impervious surface in the shoreline buffer (Figures 9 and 10). The planting effort
focuses on establishing an area of native cover near the OHWM and on the slope where the
landslide occurred. The species selected and the location of the plants have been selected to
stabilize the slope with deep roots and can thrive in dry rocky soils.
Goals, Objectives, and Performance Standards
Project Goal: Establish an area of native vegetation near the OHWM to compensate for the new
bulkhead.
Obiective 1: Establish and maintain native cover.
Performance Standard 1 (a): The project will maintain 90 percent survival of planted during the
first 2 years of monitoring. Years 3 through 5 will maintain 85 percent survival or until individual
plants cannot be identified. Plant species number will be recorded annually and compared with
as-built conditions for inclusion in monitoring reports.
Obiective 2: Control invasive species.
Performance Standard 2 (a): During monitoring Years 1 through 5, invasive species will be
removed and suppressed within the planting area as often as necessary to meet a performance
standard of no greater than 10 percent cover by invasive species. Invasive species include, but
are not limited to, English ivy. Percent cover will be recorded annually and included in
monitoring reports.
Specifications for Planting
The plants specified for installation are intended to create a naturally vegetated buffer that will
screen both noise and light from upland development and provide shade and wildlife habitat for
the shoreline. Plants will be obtained from a native plant nursery and will likely be either 1-gallon
or plugs, depending on availability and cost. They will be installed immediately following
purchase to prevent desiccation.
Plant Materials
1. Potted plants will be purchased from a local plant nursery or conservation district sale.
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2. Plant stock will be kept in a shaded area prior to being planted.
3. The plants will be specified sizing and condition as described.
4. No damaged or desiccated roots or diseased plants will be accepted.
Planting Specifications
Planting will begin at any time after construction is complete. Plants will be installed per the
attached planting plan. Table 4 summarizes the total plant species, spacing, size, and quantities
for the planting area. Plants indicated on the planting plan are subject to availability from local
nurseries and may be substituted with similarly performing native plants. The final location of
the plants may differ from the planting plan, as site conditions dictate, and any changes will be
documented on the as-built drawing prepared after completion of plant installation.
Table 4. Plant List
Common name Scientific name Spacing on Type Number
center
Shore Pine Pinus contorta 12 feet 1 gallon potted 4
Beaked Hazelnut Corylus cornuta 6 feet 1 gallon potted 6
Snowberry Symphoricarpos albus 6 feet 1 gallon potted 6
Bald Hip Rose Rosa gymnocarpa 6 feet 1 gallon potted 6
Kinnikinnick Arctostaphylos uva-ursi 3 feet 3.5 inch potted 25
Beach Strawberry Fragaria chiloensis 3 feet Plugs 25
Shore Thrift Armeria maritima 3 feet Plugs 25
Sword Fern Polystichum munitum 3 feet Plugs 25
Total 122
Plant Installation Specifications
1. Plant the specified species during the fall as listed in Table 4. Space the plants somewhat
irregularly and in groups to create eventual dense heterogeneity in the planting area,
leaving enough space between each group to allow for access for weed removal. Plant the
potted stock with a tree shovel or comparable tool.
2. Place the plants in the planting holes and position the root crowns so that they are slightly
below, the level of the surrounding gravel. Planting just below the surrounding soil will
create a shallow depression around each plant for retention of water.
3. Firmly compact the soil around the planted species to eliminate air spaces.
5. Irrigate all newly installed plants as site and weather conditions warrant.
Maintenance Plan
Maintenance of the common line setback mitigation area will occur for five years and will involve
removing invasive plant species, irrigating planted species, and reinstalling failed plantings, as
necessary. The maintenance may include the following activities:
1. Remove and control invasive vegetation around all newly installed plants a minimum of two
times during the growing season for the first five years.
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2. Irrigate planted species as necessary during the dry season, approximately July 1 through
October 15. ELS recommends that watering occur at least every two weeks during the dry
season for the first three years. The most successful method of watering plants is using a
temporary above-ground irrigation system set to a timer to ensure the plants are regularly
watered.
3. Replace dead or failed plants as described for the original installation to meet the minimum
annual survival rate and percent cover performance standards.
Monitoring Plan
The buffer area will be monitored annually for a 5-year period following plant installation.
Monitoring is proposed at the end of the growing season in Years 1, 2, 3, and 5 (Year 4 skipped).
Monitoring reports will be submitted to the Mason County Department of Community
Development (MCDCD) by December 31st of each monitored year. The goal of monitoring is to
determine if the previously stated performance standards are being met. The planting area will
be monitored once during the growing season, preferably during the same two-week period each
year to better compare the data. Individual monitoring units may be established within the
mitigation area to track the changes occurring over the monitoring period.
Vegetation
Vegetative monitoring will document the developing species. The following information will be
collected in the buffer mitigation area:
■ Frequency of herbaceous species (3.28-foot quadrant).
• Frequency of sapling/shrub species (10-foot radius).
• Frequency of tree species (30-foot radius).
• Species composition of herbs, shrubs, and trees, including non-native, invasive species.
• Photo documentation of vegetative changes over time.
Monitoring Report Contents
The annual monitoring reports will contain at least the following:
• Location map and representational drawing.
• Historic description of project, including dates of plant installation, current year of
monitoring, and restatement of goals, objectives, and performance standards.
• Description of monitoring methods.
• Documentation of plant cover and overall development of plant communities.
• Assessment of non-native, invasive plant species and recommendations for management.
• Photographs from permanent photo points.
• Summary of maintenance and contingency measures proposed for the next season and
completed for the past season.
Contingency Plan
If the performance standards are not met during any monitoring year or by the fifth year
following project completion, a contingency plan will be developed and implemented. All
contingency actions will be undertaken only after consulting and gaining approval from the
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report 11 June 4,2021
L I
MCDCD. The applicant will be required to complete a contingency plan that describes (1) the
causes of failure, (2) proposed corrective actions, (3) a schedule for completing corrective
actions, and (4) whether additional maintenance and monitoring are necessary.
FEMA FLOODPLAIN HABITAT ASSESSMENT
Habitat Narrative Primary Constituent Elements
This habitat narrative includes a discussion of the primary constituent elements (PCEs) for the
species that appear on the endangered, threatened, and sensitive list for this area of Hood Canal
as they appear in the FEMA floodplain habitat assessment guidance (FEMA 2013). The PCEs
include those associated with fish and mammal species utilizing Hood Canal as part of their life
cycle as they would be the most likely species found in floodplain areas of saltwater shorelines.
Primary Constituent Elements
The primary constituent elements for the critical habitat of Puget Sound salmon and steelhead in
or adjacent to Hood Canal include:
• Freshwater spawning sites with water quantity and quality conditions and substrate
supporting spawning incubation and larval development.
• Freshwater rearing sites with:
o Water quantity and floodplain connectivity to form and maintain physical habitat
conditions and support juvenile growth and mobility,
o Water quality and forage supporting juvenile development,
o Natural cover such as shade, submerged and overhanging large wood, log jams,
and beaver dams, aquatic vegetation, large rocks and boulders, side channels, and
undercut banks.
• Estuarine areas free of obstruction and excessive predation with
o Water quality, water quantity, and salinity conditions supporting juvenile and adult
physiological transitions between fresh-and saltwater,
o Natural cover such as submerged and overhanging large wood, aquatic vegetation,
large rocks, and boulders, side channels,
o Juvenile and adult forage, including aquatic invertebrates and fishes, supporting
growth and maturation.
• Nearshore marine areas free of obstruction and excessive predation:
o Water quality and quantity conditions and forage, including aquatic invertebrates
and fishes, supporting growth and maturation,
o Natural cover such as submerged and overhanging large wood, aquatic vegetation,
large rocks and boulders, and side channels.
• Offshore marine areas with water quality conditions and forage, including aquatic
invertebrates and fishes supporting growth and maturation.
This section of Hood Canal floodplain is composed of unvegetated cobble beach at the toe of
steep slopes with some armoring present onsite and to the east. The upland area is residentially
developed and vegetated with native forest vegetation which provides shade to the beach during
morning hours. The beach does have driftwood at the toe of the shoreline slope, at the edge of
the mapped floodplain and so provides some protection or feeding areas for the listed species.
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report 12 June 4,2021
1
The only other available primary constituent elements available on or adjacent to this site are the
nearshore and offshore marine areas. The nearshore area on onsite has overhanging large wood
to the west, significant aquatic vegetation coverage, large rocks and boulders, or side channels
that would prove valuable to the listed fish species.
Water Quality
This section of Hood Canal does not appear on the 303(d) list (Ecology 2018a). There is one water
quality improvement project for the area including dissolved oxygen, inorganic nitrogen, and
total organic carbon.
Water Quantity
The floodplain is mapped on the site and is composed of gradually sloping beach with no
vegetation in the intertidal zone. The floodplain extends to the toe of the shoreline slope in this
area. The floodplain area in the immediate project vicinity lacks freshwater habitat and other
features that would be important in the life cycle of the listed species, except that it provides
saltwater habitat for the listed fish that utilize Hood Canal.
Vegetation Communities and Habitat Structures
The shoreline along this section of Hood Canal is composed of cobble that gradually slopes down
waterward from the toe of the slope (Photoplate 2 and 4). There are trees and shrubs growing
on and on top of the shoreline slope to the west of this project area but are unable to shade the
shoreline all day long due to the height of the bluff. There are no habitat features or known
habitat for the listed bird species particularly within the mapped floodplain. Nearby trees may be
utilized by local raptor species including bald eagles but are located outside the floodplain.
Floodplain Refugia
The beach has driftwood at the toe of the shoreline slope within the mapped floodplain. The
driftwood has the potential to provide some protection or feeding areas for the listed species.
Driftwood will be temporarily moved and replaced at the end of construction so habitat
availability will not be permanently altered.
FLOODPLAIN HABITAT EFFECTS DETERMINATION
The mapped floodplain area is composed of an unvegetated beach of Hood Canal. New rock
armoring will be positioned near the OHWM and equipment will move through the mapped
floodplain of Hood Canal. The beach will be temporarily impacted by construction but will quickly
return to re-construction conditions upon completion. Driftwood will be replaced at the toe of
the bulkhead following construction. There are no primary habitat features and therefore few
primary constituent elements within the mapped floodplain that would support listed fish
species. Because there are no constituent habitat features in the floodplain area, the proposed
project will have no direct, indirect, or interrelated/interdependent effects on the floodplain
habitat.
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report 13 June 4,2021
Installing shoreline armoring will occur in the mapped floodplain. The excavator will come from
the upland and pass through the floodplain to access the work area, but construction activities
will not impact native marine or riparian vegetation. Puget Sound Chinook ESU, Puget Sound
Steelhead DPS, and bull trout are designated as threatened under the Endangered Species Act,
and the critical habitat is designated. These species utilize Hood Canal where it lies on this site,
but there will be no effect on the floodplain habitat or their use of the habitat because even
though the work will be performed from the beach it will be scheduled outside of forage fish
breeding seasons and will be restored with beach nourishment upon completion. There are also
no habitat areas for the listed birds and mammals within the mapped floodplain. Therefore, this
project may affect, but is not likely to adversely affect, the floodplain habitat of listed species or
critical habitat.
LIMITATIONS
ELS bases this report's determinations on standard scientific methodology and best professional
judgement. In our opinion, local, state, and federal regulatory agencies should agree with our
determinations. However, the information contained in this report should be considered
preliminary and used at your own risk until it has been approved in writing by the appropriate
regulatory agencies. ELS is not responsible for the impacts of any changes in environmental
standards, practices, or regulations after the date of this report.
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report 14 June 4,2021
REFERENCES
Castelle, A.J., C. Conolly, M. Emers, E.D. Metz, S. Meyer, M. Witter, S. Maurermann, T. Erickson,
S.S. Cooke. 1992. Wetland Buffers: Use and Effectiveness. Adolfson Associates, Inc.,
Shorelands and Coastal Zone Management Program, Washington Department of Ecology.
Olympia. Pub. No. 92-10.
Coastal Solutions, LLC(Coastal Solutions). January 27, 2021. Re: Geologic and Beach Processes
Reconnaissance, 890 Dewatto Beach Drive, Tahuya, Washington.
Federal Emergency Management Agency (FEMA). 2013. Floodplain Habitat Assessment and
Mitigation Regional Guidance for the Puget Sound Basin.
Mason County Code. 2017. Title 17.50 Shoreline Master Program.
Mason County Parcel Search. 2021. https:/Igis.co.mason.wa.us/mason/.Access May 2021.
National Oceanic and Atmospheric Administration (NOAA) Fisheries. 2021. NOAA Fisheries
Northwest Regions. https://www.fi sheries.noaa.gov/region/west-coast. Accessed May
2021.
United States Fish and Wildlife Service (USFWS). 2021. Endangered Species Website.
http://www.fws.pov/endangered/. Website accessed May 2021.
United States Fish and Wildlife Service (USFWS). 2021. Information for Planning and
Consultation (IPaQ website. https://ecos.fws.gov/ipac/. Website accessed May 2021.
Washington Department of Ecology (Ecology). 2014. Washington State Coastal Atlas
https://fortress.wa.gov/ecy/coastalatias/. Website accessed May 2021.
Washington Department of Fish and Wildlife (WDFW). 2021. Priority Habitats and Species PHS on
the Web. http://apps.wdfw.wa.pov/phsontheweb/. Website accessed May 2021.
Frank Dahl-Dewatto Bulkhead Replacement Ecological Land Services,Inc
Shoreline No Net Loss and Mitigation Report is June 4,2021
FIGURES&PHOTOPLATES
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Hood Canal 73Construction
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\ I Stairs
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LEGEND:
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Site Boundary
Parcel Boundary
OHWM
200'Shoreline Jurisdiction
�30,� Stairs 150'Shoreline Buffer
Staging Area \ p c N� Riprap Bulkhead
Beach � .,�
\ Qe�atti Creosote Log Bulkhead
N� ® Landslide Area(600 sf.)
—NOTE(S): Construction Access
/ 1. Aerial imagery provided by ® Construction Path
Gcogle Earth.
,\ 2. OHWM located using handheld O Construction Staging Area
- GPS with submeter accuracy. Edge of Development
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DATE:614/21 Figure 4
1157 3rd Ave.,Suite 22oA DWN: EF CONSTRUCTION ACCESS
0 50 100 *S.
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SCALE IN FEET IEC � Fax:(360)414-9305 CHK: Mason County,WA
www.eco-land.com PROJECT NO: Section 28,Township 23N,Range 3W,W.M.
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SCALE IN FEET Ec :__I Fax:(360)414-9305 CHK: Mason County WA
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'•.
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suite 220A IDWN EF COASTAL SHORELINE PHOTO
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LEGEND:
Site Boundary
OHWM
200'Shoreline
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LEGEND:
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OHWM
200'Shoreline
Jurisdiction
Hood 150'Shoreline Buffer v `'
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o Planting Detail NOTES :
cap Stairs 1. Site plan provided by Austin
Engineering.
� 2. OHWM located using handheld
LL GPS with submeter accuracy. w¢ O
��• 3. Plants are not to scale and location u ¢ o
are approximate as shown. Actual co w i c9 c�o
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w Mitigation Plant list Q
mCommon name Scientific name Spacing on Type Number
o center
E - Shore Pine Pinus contorta 12 feet 1 gallon potted 4
w Beaked Hazelnut Corylus cornuto 6 feet 1 gallon potted 6
�-- Snowberry Symphoricorpos olbus 6 feet 1 gallon potted 6 0
--- . -
Bald Hip Rose Rosa gymnocarpa 6 feet 1 gallon potted 6
U _ Kinnikinnik Arctostophylos uva- 3 feet 3.5in potted 25 N
Qursi
m --- Beach Strawberry Frogaria chiloensis 3 feet Plugs 25
v
�— Shore Thrift Armeria maritima 3 feet Plugs 25 W E
oSword Fern Polystichum munitum 3 feet Plugs 25
Total 122 5
WNPhoto 1 was taken from the gravel driveway
'+ leading to the home and adjacent prop-
erty looking northeast.
I
Photo 2 was taken from the end of the gravel
driveway looking southwest across the
parking area. The lot slopes up from
the driveway.
Photo 3 was taken from the same location as
Photo 2 and looks north across home,
down the slope and towards Hood Ca-
nal. The slope is terraced down to the
beach.
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 1
Longview,WA98632 DWN: AF Dewatto Bulkhead Replacement
�.., Phone:(360)578-1371 pRJ- MGR: LW Frank Dahl
EColoicaI Fax:(360)414-9305
g PRO1.#:3407.01 Tahuya,Washington
Land Services
Photo 4 was taken from the terrace the home is
located on looking southwest at the
landslide on the adjacent lot. The land-
slide is a result of shoreline erosion and
will be the location of the mitigation
plantings.
Photo 5 is taken from the terrace above the
home looking southwest at the adja-
cent property. The invasive English ivy
will be removed to make room for na-
tive plant installation and recruitment.
S'
Photo 6 was taken just above Photo 8 looking at
the top of the slope on the western lot.
The English ivy will be removed and the
_ top of the slope replanted with native
species.
r� a
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 2
Longview,WA 98632 DWN: AF Dewatto Bulkhead Replacement
Phone:(360)578-1371 PRJ. MGR:LW Frank Dahl
ECOlological Fax:(360)414-9305
g PROD.#:3407.01 Tahuya, Washington
Land Services
w f' Photo 7 was taken from the beach looking east
at the existing creosote log bulkhead.
The bulkhead is at high risk of being
f r breached and is in need of replace-
ment.
Photo 8 was taken from the same location as
Photo 7 and looks at the corner of the
creosote log bulkhead. There is signs
of wood-rot and piping of backfill soils.
'A
i
W `
Photo 9 was taken from the same location as
Photos 7 and 8 but looks southeast
across the remaining creosote log bulk-
head and where is ends on the eastern
lot. The western lot does not have
shoreline armoring.
All
Nor
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 3
Longview,WA 98632 DWN: AF Dewatto Bulkhead Replacement
Phone:(360)578-1371 PRJ.MGR:LW Frank Dahl
Ecooaical Fax:(360)414-9305
.7 PROJ.#:3407.01 Tahuya, Washington
Land Services
. Photo 10 was taken from the corner of the creo-
sote log bulkhead looking west across
f� the beach towards the unarmored por-
tion of the site. A rip rap bulkhead is
proposed to stabilize the shoreline
slope. On site vegetation included
" English ivy, maple, willow, madrone,
- _ and red alder trees, and various shrubs
including beaked hazelnut, roses, and
oceanspray.
xis �
Photo 11 was taken from the northwest corner
of the site looking east across the
beach towards the residence on the
eastern lot. Woody debris will be tem-
porarily moved and then returned once
construction is completed.
Photo 12 was taken from the center of the
beach of the western lot looking south
at the landslide area. Erosion destabi-
lized the slope resulting in the land-
slide. The new rip rap bulkhead will be
+w•- ` j`.. constructed at the toe of the slope
,Rx z
above the OHWM.
La's
a
tea..
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 4
Longview,WA 98632 DWN: AF Dewatto Bulkhead Replacement
,r.� Phone: (360)578-1371 PRJ. MGR:LW Frank Dahl
Ec'W is al Fax:(360)414-9305
g PROJ.#:3407.01 Tahuya,Washington
Land Services
Photo 13 was taken from the northeastern
property corner and looks south where
the sites rip rap bulkhead meets the
adjacent lot's concrete block bulkhead.
Photo 14 was taken form the same location as
Photo 13 but looks southwest across
the rip rap bulkhead. The rip rap bulk-
head is in good structural conditions
and will remain as it is.
A
Photo 15 was taken from the western side of
the rip rap bulkhead where it meets
the creosote log bulkhead. The creo-
sote log bulkhead will be replaced with
a rip rap bulkhead.
R
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 5
Longview,WA 98632 DWN: AF Dewatto Bulkhead Replacement
Phone:(360)578-1371 PFU, MGR:LW Frank Dahl
Ecoical Fax:(360)414-9305
g PROJ.#:3407.01 Tahuya, Washington
Land Services
4_
`""''�•r,.,,,,# Photo 16 was taken from the location where
equipment will be brought onto the
beach several properties east of the
project site. The armoring is lower and
the beach is more accessible at this
tY location than at the project site.
I�
Photo 17 was taken from the same location as
Photo 16 looking west across the
shoreline where equipment will travel
p
to reach the project site.
f
71
Photo 18 was taken from the same location as
Photos 16 and 17 and looks at the small
tree and pole that will have to be re-
moved to make way for the equipment
for the bulkhead replacement and con-
struction at the project site.
y'
1157 3rd Ave.,Suite 220A DATE:6/4/21 Photoplate 6
Longview,WA 98632 DWN: AF Dewatto Bulkhead Replacement
Phone:(360)578-1371 PRJ.MGR: LW Frank Dahl
Ecological Fax:(360)414-9305
PROD.#:3407.01 Tahuya, Washington
Land Services