HomeMy WebLinkAboutStampedLog Item 5 No Net Loss PlanEcoPg ICal SHORELINE M ITIGAITON PLAN
Land Services
R74=1VI
OV 2 8 2018 r=/
JEPPERSON COUNTY DCD
November 28, 2018
10
3020 Dosewallips Road
Brinnon, Washington
Prepared for
Rocky Brook Hydroelectric LP
PO Box 215
Brinnon, WA 98320
(360) 302-0658
Prepared by
Ecological Land Services
1157 3rd Avenue South, Suite 220A • Longview, WA 98632
(360) 578-1371 • Project Number 2788.01
TABLE OF CONTENTS
INTRODUCTION.....................................................................................................................................1
JEFFERSONCOUNTY SHORELINE MASTER PROGRAM...................................................................................1
SITEDESCRIPTION.................................................................................................................................1
SITE DEVELOPMENT PROPOSAL...............................................................................................................2
MITIGATIONSEQUENCING......................................................................................................................2
ENVIRONMENTAL AND HABITAT CONDITIONS............................................................................................3
SHORELINE ENVIRONMENT.................................................................................................................... 3
WILDLIFEINVENTORY........................................................................................................................... 3
BUFFERFUNCTIONS.............................................................................................................................. 4
IMPACTANALYSIS.................................................................................................................................4
...
Shoreline Impacts ..................... .
Shoreline Buffer Impacts..............................................................................::.:.I...................... 5
NO -NET -LOSS EVALUATION................................................................................................................. S
RESTORATION PLAN..............................................................................................................................5
MAINTENANCE................................................................................. ....,. :r... 7
..... . .........:...
MONITORINGPLAN..............................................................................................................................7
CONTINGENCY PLAN..............................................................................................................................%
SITEPROTECTION..................................................................................................................................8
LIMITATIONS........................................................................................................................................8
REFERENCES.........................................................................................................................................9
Table 1. Priority Habitats and Species
Table 2. Summary of Restoration Plantings
FIGURES & PHOTOPLATES
Figure 1
Vicinity Map
Figure 2
Existing Conditions
Figure 3
Proposed Conditions Overview
Figure 4
Proposed Conditions Focused
Figure 5
Jefferson County Critical Areas
Figure 6
Mitigation Plan Overview
Photoplates
Site Photos
Rocky Brook Hydroelectric Ecological Land Services, Inc.
Shoreline Mitigation Plan November 28, 2018
SIGNATURE PAGE
The information and data in this report were compiled and prepared under the supervision
and direction of the undersigned.
Laura Westervelt
Professional Biologist
Rocky Brook Hydroelectric Ecological Land Services, Inc.
Shoreline Mitigation Plan i November 28, 2018
INTRODUCTION
Ecological Land Services, Inc. (ELS) has been contracted by Rocky Brook Hydroelectric to conduct
a no -net -loss assessment (NNL) that addresses potential impacts associated with updating an
outflow structure in Brinnon, Washington. The property consists of Jefferson County Tax Parcel
Number 602282004 that lies in a portion of Section 28, Township 26 North, Range 2 West of
the Willamette Meridian (Figure 1). The project is located within the 200 -foot shoreline
jurisdiction of Rocky Brook Creek and requires completion of the no -net -loss report to satisfy the
requirements of Jefferson County Code, Title 18.25, Shoreline Master Program (JCCSMP).
Mitigation sequencing is required to address the potential impacts associated with installing a
new outflow and achieve no -net -loss of buffer function and habitat for the shoreline community.
JEFFERSON COUNTY SHORELINE MASTER PROGRAM
This project is being reviewed under the updated JCSMP that was adopted in 2015 because it is
within 200 feet of the shoreline of Rocky Brook Creek. The required buffer width is 150 feet,
which extends beyond the work area. Under the current administrative process, projects
proposing construction within the designated shoreline buffer must complete a shoreline report
to document existing conditions and show that there will be no -net -loss of buffer function per
Section 18.25.270 of the JCSMP.
SITE DESCRIPTION
The property is located on the north side of Dosewallips Road near Brinnon, Jefferson County,
Washington (Figure 1). It is an irregular-shaped property that is narrow at the road, widens to
the north, and becomes narrow again at the north end (Figure 2). The property is accessed by a
gravel parking area adjacent to Dosewallips Road. Beyond the parking area there is a gravel
access road which parallels the creek and terminates at the foot of the Rocky Brook Falls. A
metal gate is positioned near the parking area to allow pedestrian access while restricting motor
vehicle access (Photoplate 1). Inside the gate, there is a powerhouse positioned on the west side
of the access road, which houses turbines. The existing outflow lies about 200 feet northeast of
the powerhouse near the toe of the falls. However, the project area is restricted to the area
between the powerhouse and the Rocky Brook Creek. There is minimal vegetation rooted on the
rip -rap bank of the creek, with some scattered, immature deciduous saplings and sparse native
shrubs (Photoplate 1).
Topography onsite is highest at the north end and a steep rock face separates the north half
from the south half. The south half slopes gently south, with steep rip -rap armoring along the
west bank of Rocky Brook Creek. Rocky Brook Creek enters the north end of the property and
flows south. Halfway through the property, the creek falls over 100 feet and plunges into a pool
below (Figure 2). The creek continues southwest next to the access road, passes under
Dosewallips Road, and drains into the Dosewallips River offsite and eventually into Hood Canal.
The required buffer width for stream and freshwater shorelines is 150 feet. The buffer extends
west from the OHWM of Rocky Brook Creek and beyond the powerhouse. The buffer consists of
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November 18, 2018
a sparsely vegetated, rip -rap embankment that supports the gravel access road and the
powerhouse. The area is developed with an existing gravel road and a hydroelectric facility,
which represents an interruption in the buffer. West of the access road, the slope is vegetated
with a mix of deciduous and coniferous tree cover.
SITE DEVELOPMENT PROPOSAL
The turbines within powerhouse are in a state of disrepair and need to be updated in order to
continue operating and creating power for the nearby community. In order to upgrade the
turbines, the outflow structure also needs updating. The new system will reduce the amount of
flow needed to power the turbines by approximately 50 percent.
The proposal involves upgrading the existing outflow structure associated with the hydroelectric
plant. The new outflow structure consists of 20 feet of 24 inch pipe anchored within a concrete
box that will be buried beneath the existing access road directly adjacent to the powerhouse
(Figure 3). In order to install the new outflow structure, the access road will be excavated to a
depth of about 3 feet. The concrete box will be poured and the pipe set in place and re -buried.
The outflow will release several feet above the OWHM of Rocky Brook Creek and drain into the
channel. Vegetation removal in the buffer is minimal, but at least one immature, deciduous
tree will be removed. The area temporarily disturbed by installation will be restored as part of
the project. The area will return to pre -construction conditions and maintain pedestrian access
upon completion.
In order to accommodate the proposal for work near Rocky Brook Creek, the project must
address potential impacts to the function and habitat of the shoreline buffer. All work will be
performed landward of the OHWM. There will be no new permanent impacts to important
habitat or vegetation because the area will be restored upon completion. Upgrading the
outflow structure will not create new or adverse impacts to the shoreline and therefore
achieves a no -net -loss of shoreline buffer function.
MITIGATION SEQUENCING
The project area lies within the 200 foot shoreline jurisdiction and the 150 foot shoreline buffer
of Rocky Brook Creek. There is floodplain habitat mapped along Dosewallips River across the
road, which does not extend onsite according to current FEMA mapping. There is also landslide
and erosion hazard mapped across the entire property and an area of seismic hazard mapped at
the south end. Construction is proposed within the shoreline buffer and therefore requires
assessment of impacts. This portion of the buffer is composed of rip -rap armoring, gravel access
road, and the powerhouse (Figure 2). 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.
Avoiding Impacts: The project avoids new permanent impacts to the shoreline by proposing a
buried pipe that does not increase onsite impervious surfaces or impact important habitat
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Ecological Land Services, Inc
November 28, 2018
features. By placing the outflow structure several feet above the OHWM of the creek, the
project also avoids impacts to important salmon habitat and riparian processes.
Minimizing Impacts: Impacts to the shoreline buffer are minimized by completing construction
activities within a couple days and reducing the amount of construction noise to the extent
possible. By reducing the amount of flow needed by up to 50 percent, the project is minimizing
impacts to the natural flow patterns of the creek.
Rectifying, Reducing, or Eliminating the Impacts: The project represents a permanent
improvement to habitat in the buffer within shoreline jurisdiction.
Compensating for Impacts: The project cannot avoid, rectify, or reduce temporary impacts
associated with construction of the new outflow, but has minimized impacts to the extent
possible. The new outflow is proposed in an area of existing development and represents
temporary impacts. The bank of Rocky Brook will be re -planted upon completion of construction
to aid in re -vegetation. Because the project is proposed within existing development there will
be no new impacts to the shoreline buffer. Once construction activities are completed and the
restoration plan has been implemented, this area of the site will return to pre -construction
condition.
ENVIRONMENTAL AND HABITAT CONDITIONS
Shoreline Environment
The shoreline within the project area is composed of Rocky Brook Creek, which is connected to
the Dosewallips River and the west side of Hood Canal (Figure 1). This section of shoreline is
composed of a creek bed with boulders and a rip -rap embankment with some native riparian
vegetation (Photoplate 1).
This section of shoreline is composed of a power plant and pedestrian access with 100 percent
rip rap armoring along the OHWIVI that extend to Dosewallips Road. Portions of the
Dosewallips River are also armored as it flows into Hood Canal farther downgradient.
Wildlife Inventory
There are many species of resident and seasonal salmon species mapped in Rocky Brook Creek
(Table 1) (WDFW 2018). There is also management areas mapped for elk, northern spotted owl,
and harlequin ducks. There are no habitat features available for the federally listed
endangered, threatened, or sensitive species in the project area except for listed salmonids
species, which utilize Rocky Brook Creek as part of their lifecycle (USFWS/NOAA Fisheries 2018).
None of the species identified during online research were observed during the site visit
conducted on September 5, 2018. The shoreline environment appears to be in a natural
condition waterward of the bulkhead with no recent disturbances observed so provides quality
habitat to the species identified within this area of the shoreline.
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Table 1. Priority Habitats and Species *
Common Name
Species Name
Type
Resident Coastal Cutthroat
Oncorhynchus clarki
Occurrence
Fall Chinook
Oncorhynchus tshawytscha
Breeding area
Rainbow Trout
Oncorhynchus mykiss
Occurrence
Winter Steelhead
Oncorhynchus m kiss
Occurrence
Cutthroat
Oncorhynchus clarki
Occurrence
Steelhead
Oncorhynchus m kiss
Occurrence
Fall Chum
Oncorhynchus keta
Breeding area
Coho
Oncorhynchus nerka
Breeding area
Kokanee
Oncorhynchus nerka
Occurrence
Pink Salmon Odd Year
Oncorhynchus gorbuscho
Breeding area
Chinook
Oncorhynchus tshawytscha
Occurrence
Chum
Oncorhynchus keta
Occurrence
Coho
Oncorhynchus kisutch
Occurrence
Pink
Oncorhynchus kisutch
Occurrence
Elk
Cervus elaphus
Management buffer
Northern Spotted Owl
Strix occidentalis
Management Buffer and
occurrence
Harlequin duck
Histrionicus histrionicus
Breeding area
*From the WDFW Priority Habitats & Species Mapping tool
Buffer Functions
The project area lies within a shoreline conservation designation and is zoned Rural -Residential,
which allows 1 dwelling unit per 5 acres. This section of Rocky Brook is entirely armored with
rip -rap. The gravel pathway and powerhouse are situated above the armed bank of the creek.
Because the creek bank is armored and the buffer is encumbered with an existing gravel road,
onsite function is fairly low.
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 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. In some cases, buffers as low as
50 feet are effective in filtering pollutants when there is dense groundcover, no slope or a
gradual slope, and the runoff sheet flows across the buffer. The buffer is developed and has
limited function as a result.
IMPACT ANALYSIS
Shoreline Impacts
The shoreline of Rocky Brook will not be directly impacted by onsite construction activities
because the project represents temporary impacts in an area already occupied by human
development (Photoplate 1). The new outflow is proposed in an area of existing impervious
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Shoreline Mitigation Plan 4 November 28, 2018
surface and will be buried beneath the ground. There will be some impact to vegetation cover
but the planting plan will provide an overall lift of function. There will be no increase in the
amount of runoff generated onsite because the amount of impervious surface will not increase.
There will be no indirect stormwater impacts on the shoreline because the stormwater
generated onsite will remain the same as before.
Noise generated during construction, which will include use of heavy equipment and workers,
may influence use of the shoreline environment by wildlife species. This area is already
developed and there is noise currently generated by existing tourist activities. There will likely
be an increase in noise generated during construction but once construction is completed, the
noise will return to current levels.
Shoreline Buffer Impacts
The project proposes to construct an outflow structure beneath the existing gravel access road,
which demonstrates avoidance of additional buffer/shoreline impacts and new impacts. The
project will only temporarily increase the amount of noise and light generated, but will return to
normal post -construction. The site 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.
No -Net -Loss Evaluation
Because the project proposes to restore native riparian vegetation, there will be no -net -loss of
buffer function of the shoreline environment. The shoreline bank will return to pre -construction
conditions upon completion and the shoreline itself will not be affected. Construction work will
occur in the upland, developed portion of the lot and is the minimum necessary to complete the
project. This project achieves the no -net -loss requirement of the JCSMP.
During construction activities, best management practices will be utilized to protect the
shoreline environment with regard to siltation caused by exposed soils within the impacted
buffer. Best management practices for siltation will include use of silt fences, hay bales, and
other means to prevent movement of soil material in the critical area during all phases of the
construction process.
RESTORATION PLAN
In order to ensure a no -net -loss of ecological function, the project proposes to restore 320
square feet of temporarily disturbed bank (Figure 6). Table 2 summarizes the proposed
plantings.
Table 1. Summary of Restoration Plantinas
Species
Common Name
Size
Spacing
Number
Picea sitchensis
Sitka spruce
8 feet on center
3 -gallon, potted
3
Ribes songuineum
Red flowering currant
5 feet on center
1 -gallon, potted
6
Rosa nutkana
Nootka rose
5 feet on center
1 -gallon, potted
6
Blechnum spicant
Deer fern
2 feet on center
1 -gallon, potted
20
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Total 35
Goals, Objectives, and Performance Standards
Project Goal: Restore shoreline buffer function to achieve no -net -loss of buffer functions in
order to compensate for temporary impacts associated with outflow installation.
Objective 1: Improve native plant cover within the forested understory.
Performance Standard 1(a): The project will maintain 100 percent survival of plants during the
Years 1 and 2. Plant species number will be recorded and compared with as -built conditions for
inclusion with the monitoring reports.
Performance Standard 1(b) In Years 3 and 5, percent cover will be at least 15 and 20 percent
respectively. Percent cover will be recorded and compared with as -built conditions for inclusion
with the monitoring reports.
Objective 2: Control invasive species.
Performance Standard 2(a): During Years 1 through 5, invasive species will be removed and
suppressed in the restoration areas as often as necessary to meet a performance standard of no
greater than 15 percent cover by invasive species. Percent cover will be recorded annually and
included in monitoring reports.
Potted Stock
1. 1 -gallon potted plants will be purchased from a native plant nursery.
2. Potted stock will have a minimum size of 1.5 to 3 feet tall.
3. Potted stock will be kept in a shaded area prior to being planted.
4. The potted stock will have well-developed roots and sturdy stems with an appropriate
root- to -shoot ratio.
5. No damaged or desiccated roots or diseased plants will be accepted.
6. Unplanted stock will be properly stored at the end of each planting day to prevent
desiccation.
7. The project biologist will be responsible for inspecting potted stock prior to and during
planting and culling unacceptable plant materials.
Planting Methods
1. Plant the specified plants in winter 2018-2019 (or subsequent winter) after construction
activities are completed, as listed in Table 2. Planting after construction is completed is
recommended to avoid impacting the plants during construction. Space the plants
somewhat irregularly and in groups to create dense heterogeneity in the planting area,
leaving enough space between each group to allow for mowing. Plant the potted stock
with a tree shovel or comparable tool.
2. Place the potted species in the planting holes so that their roots are able to extend down
entirely and do not bend upward or circle inside the hole.
3. Position the root crowns so that they are at, or slightly above, the level of the
surrounding soil.
4. Firmly compact the soil around the planted species to eliminate air spaces.
Rocky Brook Hydroelectric Ecological Land Services, Inc
Shoreline Mitigation Plan 6 November 28, 2018
MAINTENANCE
Maintenance of the planting areas will occur for 5 years and will involve controlling invasive plant
species and reinstalling failed plantings, as necessary. Water will not likely be necessary due to
the shaded nature of the area. The maintenance may include the following activities:
1. Remove and control non-native and/or invasive vegetation from within the shoreline
buffer a minimum of two times during the growing season for the first five years.
2. 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 restoration area will be monitored annually for a 5 -year period following plant installation.
Monitoring reports will be submitted to the Jefferson County by December 31 of each monitored
year. The goal of monitoring is to determine if the previously stated performance standards are
being met. The restoration area will be monitored once during the growing season, preferably
during the same two-week period each year to better compare the data.
The use of monitoring units is often not necessary for smaller restoration plantings such as this.
The entire planting area can easily be monitored due to the low number of plants being installed.
Photo stations will be established from several locations within the restoration area to visually
document the changes that occur in the buffer during the 5 -year monitoring period.
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.
• observations of wildlife, including, amphibians, invertebrates, reptiles, birds, and
mammals
• 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 by the fifth year following project completion, a
contingency plan will be implemented. All contingency actions will be undertaken only after
consulting and gaining approval from Jefferson County. The applicant will be required to
complete a contingency plan that describes (1) the causes of failure, (2) proposed corrective
Rocky Brook Hydroelectric
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Ecological Land Services, Inc
November 28, 2018
actions, (3) a schedule for completing corrective actions, and (4) whether additional maintenance
and monitoring are necessary.
SITE PROTECTION
The restored buffer area will be owned, maintained, and managed by the landowner, unless such
responsibilities are assigned to another entity. The owners will be responsible for maintenance
and monitoring of the planting areas for the prescribed 5 -year period.
LIMITATIONS
The services described in this report were performed consistent with generally accepted
professional consulting principles and practices. There are no other warranties, express or
implied. The services preformed were consistent with our agreement with our client. This report
is prepared solely for the use of our client and may not be used or relied upon by a third party
for any purpose. Any such use or reliance will be at such party's risk.
The opinions and recommendations contained in this report apply to conditions existing when
services were performed. ELS is not responsible for the impacts of any changes in environmental
standards, practices, or regulations after the date of this report. ELS does not warrant the
accuracy of supplemental information incorporated in this report that was supplied by others.
Rocky Brook Hydroelectric Ecological Land Services, Inc
Shoreline Mitigation Plan 8 November 28, 2018
CES
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.
Jefferson County Code. 2015. Title 18 Shoreline Management Program.
Jefferson County Parcel Search, 2015. https://Oeffcowa.maps.arcgis.com/home/index.html
Accessed November 2018.
Sheldon, D. T. Hruby, P. Johnson, K. Harper, A. McMillan, T. Granger, S. Stanley, and E. Stockdale.
March 2005. Wetlands in Washington State — Volume 1: A Synthesis of the Science.
Washington State Department of Ecology. Publication #05-06-006. Olympia, WA.
United States Fish and Wildlife Service (USFWS). Endangered Species Website.
http,llwww.fws.gov/endangered/. Website accessed November 2018_
Washington Department of Ecology. 2014. Washington State Coastal Atlas
https.//fortress.wa.gov/ecy/coastalatias/. Website accessed November 2018.
Washington Department of Fish and Wildlife. 2016. Priority Habitats and Species PHS on the
Web. http:llaPPs.wdfw.wa.gov/phsontheweb/. Website accessed November 2018.
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Photo 1: was taken from the parking area
near Dosewallips Road, looking
north at the gate and pedestrian ac-
cess. The powerhouse is visible in
the background of the photo.
Photo 2 was taken from the edge of the
pedestrian access trail adjacent to
the powerhouse pictured in Photo 1.
It shows the armored bank of Rocky
Brook Creek that will be restored
upon completion of construction ac-
tivities. The red alder tree in the
picture is likely the only native tree
that will be removed to accommo-
date the project.
Photo 3 was taken from the north side of
the powerhouse looking south along
the pedestrian path. This area of
the path will be excavated to accom-
modate the new outfall pipe and
housing. Upon completion of con-
struction, the area will be re -buried
and return to preconstruction condi-
tions.
1157 3rd Ave., Suite 220A DATE: 11/6/18 Photoplate 1
Longview, WA 98632 DWN: LHW Project Name: Rocky Brook HMP
Phone: (360) 578-1371 PRJ. MGR: LHW Client: Rocky Brook Hydroelectric
Ecol al Fax: (360) 414-9305 y� Washington
Jefferson Count
PROJ.#:2788.01 g
Land Services