HomeMy WebLinkAboutHMP for MEP2012-00015 - HMP Habitat Managment Plan - 12/26/2012 0(7
MASON COUNTY DEPARTMENT OF COMMUNITY DEVELOPMENT
Mason County Planning Mason County Bldg.I
P.O.Box 279 411 N 5th Street,Shelton
Shelton,WA 98584 (360)427-9670
-=— HOME PAGE—www.co.mason.wa.us
January 18,2013
Skokomish Tribal Nation Washington Dept. of Fish& Wildlife
Natural Resource Department ATTN: Gloria Rogers
ATTN: Randy Lumper 48 Devonshire Rd.
N 541 Tribal Center Rd. Montesano,WA 98663
Skokomish Nation,WA 98584
RE: Habitat Management Plan Review for FWHCA Mason Environmental Permit (MEP2012-
00015)
Dear Mr. Lumper and Ms. Rogers:
The enclosed Habitat Management Plan(HMP)has been provided by the applicant for relocating 100 feet
of Winter Creek to protect hydroelectric dam's(on Lilliwap Creek)intake area.
Project Site: 501 N Lilliwaup Street,Lilliwaup,WA(NW Qtr of Section 19 in T23N,R4W WM).
Critical Area: Winter Creek and Lilliwaup Creek Fish and Wildlife Habitat Conservation Area's.
Applicant: Lilliwaup Falls Generating Company.
HMP Author,Date: Kim Schaumburg(BioResources),December 2012.
Proposed Mitigation: Restore buffers by placing jute matting and hydroseeding,then planting native trees
and shrubs.
Please review the enclosed HMP and let me know if you have comments, question, or concerns about this
plan. Our ordinance allows for a 28-day comment period,therefore the closing date for comments is
February 15`h,2013.
The SEPA Checklist(MDNS)and JARPA for Shorelien Substantial Development/Conditional Use is
enclosed as well. The SEPA comment period ends February 1",2013. Thank you for your consideration
in this matter.
Sincerely,
Rebecca Hersha,Land Use Planner
Mason County Dept.of Community Development
Ph. (360)427-9670,ext.287
E-mail rebeccah(@co.mason.wa.us
Enclosures
RECEIVED o w rn PZa 1 Z- LW 15
l
JAN 14 2013
426 W. �CEDM ST, �'
` Habitat Management Plan
LilliwaupFalls Power Project/Winter Creek Relocation
J
Lilliwaup, Washington
For:
Lilliwaup Falls Generating Company
1402 3rd Ave
Suite 1318
Seattle, WA 98101-2116
Prepared by:
BioResources, LLC
Kim Schaumburg/Fisheries Biologist
10112 Bayview Road KPN Vaughn,WA 98394
(253) 884-5776 or 225-2973
Email: kimber1y035(a centurytel.net
December 26,2012
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Table of Contents
I. Project Description
A. Project Location...................................................................3
B. Project Description................................................................3-5
C. Best Management Practices..................................................... 5
Preserving Natural Vegetation—BMP C 101.........................5
Temporary and Permanent Seeding—BMP C 120.................. 5-6
Additional BMPs.........................................................6
D. WDFW WAC Construction Requirements....................................6
WAC 220-11-080 Channel change/realignment...................6-7
WAC 220-110-050 Bank protection(freshwater)...................7-9
II. Species and Habitat Information
A. Species and Habitat Information.................................................. 9
B. Survey Results........................................................................9-10
Existing Environmental Conditions.............................................. 10-12
III. Effects
A. Direct Effects....................................................................... 12-13
B. Indirect Effects.............................. ................. 13
C. Conservation Measures........................................................... 14
D. Planting Plan........................................................................ 14-15
List of Attachments
1. Vicinity Map...............................................................................18
2. Site Photograph........................................................................... 19
3. Site Photograph........................................................................... 20
4. Site Photograph........................................................................... 21
5. Site Photograph........................................................................... 22
6. Site Photograph........................................................................... 23
7. Site Photograph........................................................................... 24
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I. Project Description
A. Project Location
501 N Lilliwaup St,Lilliwaup WA(Attachment 1)
Tax Parcels#32319-23-00000
Section 19,Township 23N, Range 03 W, W.M.
B. Project Description
This Habitat Management Plan has been submitted on behalf of the Lilliwaup Falls
Generating Company to facilitate approval of a proposal to relocate approximately 100
feet of the channel of Winter Creek, as part of a previously submitted project to repair an
existing privately owned hydroelectric facility that was rendered inoperable by storm
damage during the winters of 2005/2006 and 2007/2008. In addition to the damaged
hydroelectric facility,the property includes a single-family residence and a salmon
hatchery facility that is operated by Long Live the Kings. The project site is located off
SR Hwy 101 at Lilliwaup Falls, which consists of a series of fish impassable waterfalls
that drop over 300 feet in elevation on Lilliwaup Creek. Below the falls,the stream's
lower reach supports several ESA listed salmon species. Lilliwaup Creek, a Department
of Natural Resources (DNR)Type S (shoreline, fish-bearing) water body and its
tributary, Winter Creek, a DNR Type F (potential fish-bearing) water body are located in
the project area.
Lilliwaup Creek is regulated under the Mason County Shoreline Master Program and the
Mason County Resource Ordinance as a Fish and Wildlife Habitat Conservation Area
(FWHCA). Winter Creek is regulated under the Mason County Resource Ordinance as a
FWHCA. In accordance with Mason County's FWHCA, 17.01.110, a habitat
management plan is required for activities within the 150 foot buffer of Type S and Type
F streams. This report addresses proposed activities within the buffers of both streams.
The proposed project activities consist of three elements that are being permitted
separately:
1. Landslide and conveyance pipe repairs.
2. Intake area repairs.
3. Intake area preventative action.
Element numbers one and two have been approved. The intake area repairs were
completed in the fall of 2012,while the landslide and conveyance pipe repairs are
scheduled to commence in the summer of 2013.
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Intake Area Preventative Action
The channel bed of Winter Creek, which presently discharges into Lilliwaup Creek in the
vicinity of the hydroelectric facility's intake area, was previously modified (i.e. relocated)
to discharge approximately 90 feet upstream,but Winter Creek has since avulsed and
changed course. The previously modified(relocated) channel deviates from the present
channel in a northwest fork that is located approximately 70 feet upstream from the
intake area. In the winter of 1995 the structural integrity of the fill material that
redirected the stream into the modified channel failed and was washed out(Moore,
Martig, Boad 2011). The modified channel was repaired but failed again during heavy
flows in the winter of 2005/2006. Presently,the failed modified channel is filled with
coarse alluvial sediments (cobble and gravel). To alleviate erosion and aggradation of
sediments at the intake area, approximately 100 feet of Winter Creek's present channel,
upstream from its discharge point into Lilliwaup Creek,will be relocated up to (approx.)
25 feet westward, away from the intake area(See separate attachment entitled Lilliwaup
Falls Power Project, Winter Creek Channel Relocation at Lilliwaup Falls,December
21, 2012).
Proposed activities include:
*Relocating approx. 100 feet of Winter Creek's existing channel by moving it
westward up to (approx.)25 feet; however, Winter Creek will confluence with
Lilliwaup Creek in approx. the same location. The new channel bed will vary
between 8 feet and 10 feet in width. The west bank will be laid back at a 3:1
slope into the native soil, covered with biodegradable jute matting where
appropriate, and replanted with native trees and shrubs.
*The construction of streambank protection for approximately 100 feet along the
newly relocated east bank of Winter Creek, using large (three to five man)
angular granite. The rock will be placed at approx. a 1:1 slope and backed with
quarry spalls and filter fabric. At the northernmost end, an anchor point will be
installed by burying large angular rock for approx. twenty feet. The purpose of
the anchor point is to prevent the stream from avulsing behind the armoring.
Native trees and shrubs will be planted between the anchor point wall and the
parking area.
*The installation of several rock weirs in the new channel to prevent headcutting and
channel bed incision. The weirs will be constructed of two to three man round
granite rock and will be installed in a manner that replicates natural conditions.
*The placement of additional concrete ecology blocks (or large angular rock)along
the intake area structure's north border to alleviate or prevent erosion damage to
the structure in the event that heavy seasonal flood flows from Winter Creek
overspill the proposed rock armoring.
•The installation of approx. 25 feet of 18"pipe to extend an existing pipe between an
existing overflow channel to the east and the new relocated channel of Winter
Creek.
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All equipment and materials will be driven to the site using existing roads. The
equipment shall consist of heavy machinery and hand tools. Project construction is
tentatively scheduled to begin, after the receipt of all required permits and approvals, in
the dry season of 2012. Construction will be completed during daylight working hours
normal to a rural neighborhood. No construction shall take place when Winter Creek
is flowing.
C. Best Management Practices
In order to maintain the present water quality of Lilliwaup Creek and Winter Creek
during project construction, Best Management Practices will be implemented. BMPs are
defined as physical, structural, and/or managerial practices that prevent or reduce the
pollution of water(WDOE). The following source control BMPs, which are detailed in
the WDOE's Stormwater Management Manual for Western Washington(2005), shall be
implemented for long-term protection of water quality at the site:
1. Preserving Natural Vegetation—BMP C101. Wherever practical native vegetative
shall be preserved to reduce erosion. Limiting site disturbance is the single most
effective method for reducing erosion(WDOE 2005).
2. Temporary and Permanent Seeding—BMP C120. Seeding is intended to reduce
erosion by stabilizing exposed soils.
*The optimum seeding windows for western Washington are April 1 through
June 30; and September 1 through October 1. Seeding that occurs
between July 1 and August 30 will require irrigation until 75 percent
grass cover is established. Seeding between October 2 and March 30 is
not recommended for this project.
*Mulch is always required for seeding. Mulch can be applied on top of the
seed or simultaneously by hydroseeding. It is recommended that only
organic mulch be used for this project. No fertilizer is recommended, due
to the close proximity of the streams.
*Local suppliers or the local conservation district should be consulted for
their recommendations because the appropriate mix depends on a variety
of factors, including location, exposure, soil type, slope and expected foot
traffic. Meadow seed mix may be appropriate for use in this project as it
is recommended for areas that will be maintained infrequently or not at all
and where colonization by native plants is desirable.
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Meadow Seed Mix
%weight %purity % germination
Redtop or Oregon bentgrass (Agrostis alba 20 92 85
or Agrostis oregonensis)
Red Fescue(Festuca rubra) 70 98 90
White dutch clover(Trifolium repens) 10 98 90
The following additional BMPs shall be used to insure that water quality is not
degraded during and after construction:
1. Equipment shall be cleaned and checked for leaks, offsite and daily, before
commencing work.
2. Rock shall be clean before being placed in stream.
C. WDFW WAC Construction Requirements
The following Washington State Department of Fish and Wildlife's (WDFW)
construction requirements for Channel change/realignment(WAC 220-110-080) and
bank protection(WAC 220-110-050) shall be strictly adhered to:
WAC 220-11-480
Channel change/realignment
Channel changes/realignments are generally discouraged, and shall only be approved
where the applicant can demonstrate benefits or lack of adverse impact to fish life.
Channel change/realignment projects shall incorporate mitigation measures as necessary
to achieve no-net-loss of productive capacity of fish habitat. The following technical
provisions(applicable to an ephemeral stream)shall apply to channel change and channel
realignment projects:
When approved, a channel change may occur provided:
*Permanent new channels shall, at minimum, be similar in length,width,
depth, flood plain configuration, and gradient as the old channel. The
new channel shall incorporate fish habitat components, bed materials,
meander configuration, and native or other approved vegetation
equivalent to or greater than that which previously existed in the old
channel.
•During construction,the new channel shall be isolated from the flowing
stream by plugs at the upstream and downstream ends of the new channel.
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*Before water is diverted into a permanent new channel,the applicant shall
complete the following actions:
1)Approved fish habitat components, bed materials and bank protection to
prevent erosion shall be in place.
2)Approved fish habitat components shall be installed according to an
approved design to withstand the 100-year peak flows.
*All disturbed areas shall be protected from erosion,within seven days of
completions of the project, using vegetation or other means. The banks
shall be revegetated within one year with native or other approved woody
species. Vegetative cuttings shall be planted at a maximum interval of
three feet(on center),and maintained as necessary for three years to
ensure eighty percent survival. Where proposed, planting densities and
maintenance requirements for rooted stock will be determined on a site-
specific basis. The requirement to plant woody vegetation may be waived
for areas where the potential for natural revegetation is adequate, or where
other engineering or safety factors preclude them.
WAC 220-110-050
Bank protection (freshwater)
Bio-engineering is the preferred method of bank protection where practicable. Bank
protection projects shall incorporate mitigation measures as necessary to achieve no-net-
loss of productive capacity of fish habitat. The following technical provisions shall apply
to bank protection projects:
*Bank protection work shall be restricted to work necessary to protect eroding
banks.
•Bank protection material placement waterward of the ordinary high water
line shall be restricted to the minimum amount necessary to protect the toe
of the bank, or for installation of mitigation features approved by the
department.
•The toe shall be designed to protect the integrity of bank protection material.
*Bank sloping shall be accomplished in a manner that avoids release of
overburden material into the water. Overburden material resulting from
the project shall be deposited so as not to reenter the water.
*Alteration or disturbance of the bank and bank vegetation shall be limited to
that necessary to construct the project. All disturbed areas shall be
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protected from erosion, within seven calendar days of completion of the
project, using vegetation or other means. The banks, including riprap
areas, shall be revegetated within one year with native or other approved
woody species. Vegetative cuttings shall be planted at a maximum
interval of three feet(on center), and maintained as necessary for three
years to ensure eighty percent survival. Where proposed,planting
densities and maintenance requirements for rooted stock will be
determined on a site-specific basis. The requirement to plant woody
vegetation may be waived for areas where the potential for natural
revegetation is adequate, or where other engineering or safety factors
preclude them.
*Fish habitat components such as logs, stumps, and/or large boulders may be
required as part of the bank protection project to mitigate project impacts.
These fish habitat components shall be installed according to an approved
design to withstand 100-year peak flows.
•When rock or other hard materials are approved for bank protection,the
following provisions shall apply:
1)Bank protection material shall be angular rock. The project shall be
designed and the rock installed to withstand 100-year peak flows.
River gravels shall not be used as exterior armor, except as specifically
approved by the department.
2)Bank protection and filter blanket material shall be placed from the bank
or a barge. Dumping onto the bank face shall be permitted only if the
toe is established and the material can be confined to the bank face.
In addition to the previously discussed BMPs,the following Spill Prevention Control
measures shall also be followed:
1. The contractor will supply the site with a portable bathroom so that solid or liquid
waste will not become a source of stormwater pollution.
2. The contractor shall be responsible for alerting the appropriate authorities in the event
of a hazardous spill.
3. The contractor shall be able to perform basic control, containment, and/or confinement
operations within the capabilities of the resources and personnel protective equipment
available. In other words, small spills, such as paint or oil, shall be promptly and fully
collected and disposed of at a suitable disposal site.
In the event of a significant spill, a fish kill, and/or if fish are observed in distress the
Washington State Department of Ecology(800.258.5990) and the Washington State
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Department of Fish and Wildlife's Area Habitat Biologist, Gloria Rogers (360.249.1293),
shall be notified immediately.
III. SPECIES AND HABITAT INFORMATION
A. SPECIES INFORMATION
In the proposed project area, there are six species listed under the Endangered Species
Act by the U.S. Fish and Wildlife Service as either Endangered or Threatened: the Puget
Sound Chinook salmon(Oncorhynchus tshawytscha), the Puget Sound Steelhead
(Oncorhynchus mykiss),the Hood Canal summer-run chum salmon (Oncorhynchus keta),
the bull trout(Salvelinus confluentus),the marbled murrelet(Brachyramphus
marmoratus marmoratus), and the northern spotted owl (Stridex occidentalis).
Additionally,the Washington Department of Fish and Wildlife publishes a Priority
Habitats and Species list(PHS)and a Species of Concern(SOC) list. The PHS list
includes habitats, species, and species groups considered to be priorities for conservation
and management.
A Washington Department of Fish and Wildlife (WDFW) Priority Habitats and Species
Report from 1-17-2012 documents the presence of three species of anadromous
salmonids on the State's PHS list within the immediate project area(i.e. Lilliwaup Creek
above the falls): the Puget Sound/Coastal cutthroat trout(Oncorhynchus clarki clarki),
the cutthroat trout(Oncorhynchus clarki), and the rainbow trout(Oncorhynchus mykiss).
In addition, WDFW data revealed that one other species of anadromous salmonid on the
state's SOC list may be found in the greater project area: the Puget Sound coho salmon
(Oncorhynchus kisutch). Conservation measures proposed in this report are
expected/intended to minimize impacts to listed and/or unlisted species that may inhabit
or utilize the proposed project site.
B. Survey Results
Field investigations were conducted on October 18, 2011 and on January 11, 2012. The
project area was surveyed visually on foot, although a vehicle was used to access the
upper reaches of the proposed project area. The weather was overcast and the wind calm
on both days.
The proposed project site is located on one of three adjacent parcels that comprise a total
of approximately 76 acres. The majority of the site is heavily forested with upland native
vegetation. A gravel road runs from the hydroelectric facility's Power House to the
intake area above Lilliwaup Falls. The intake area consists of a concrete intake box and
associated appurtenances (Attachments 2 & 3),a concrete wall at the top of the waterfall,
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an ecology block wall(approximately 25 feet in length)adjacent the north side of the
intake box, and a smaller concrete wall (approximately 30 feet in length and two feet in
height) located approximately 35 feet upstream of the intake area,near mid-channel of
Lilliwaup Creek, on a slight diagonal relative to downstream flow.
Winter Creek, an ephemeral stream, discharges into Lilliwaup Creek in the immediate
vicinity of the intake facility (Attachments 4 & 5), on a perpendicular then parallel path,
which has resulted in significant damage from erosion and the aggradation of alluvial
sediments. During the October site visit, Winter Creek was dry(Attachment 6). The
channel bed was significantly channelized for approximately 100 feet upstream from the
intake area and aggraded with cobble and both large and small gravel. It is expected that
Winter Creek flows heavily at times. In January, it was flowing lightly. No fish were
observed in the stream nor is it likely that any spawn there.
The failed relocated channel reach is located approximately 70 feet upstream, off the west
stream bank. This channel is partially filled with coarse alluvial sediments. A culvert
located approximately 35 feet from the intake area, on the east bank of Winter Creek,
discharges water from an existing overflow channel that presently has no channel
connectivity to Winter Creek and appears to function solely as an overflow channel. The
east bank of Winter Creek is scantly vegetated in the vicinity of the intake area and
consists primarily of the access road and gravel parking. The west bank is also minimally
vegetated(Attachment 7).
The following native species were observed at the proposed project site: Western red
cedar(Thuja plicata), Douglas-fir(Pseudotsuga menziesii), hemlock(Tsuga
heterophylla), Sitka spruce(Picea sitchensis),grand fir(Abies grandis), bigleaf maple
(Acer macrophyllum), Red alder(alnus rubra),willow(Salix spp.),vine maple (Acer
Circinaturm), Indian plum(Oemleria cerasiformis), evergreen huckleberry (Vaccinium
ovatum), salmonberry(Rubus Spectabilis), sword fern(Polystichum munitum), licorice
fern(Polypodium glycyrrhiza), salal (Gaultheria shallon), Oregon-grape (Berberis
nervosa), and kinnikinnick(Arctostaphylos uva-ursi).
The following non-native species were also observed: Himalayan blackberry (Rubus
procerus)and Scot's Broom (Cytisus scoparius).
C. Existing Environmental Conditions
The environmental baseline represents the existing set of conditions,to which the effects
of the proposed action are then added. The proposed project site is located in the Water
Resource Inventory Area(WRIA) 16, on Lilliwaup Creek in Mason County.
Neighboring properties to the west, east, and north are heavily forested and undeveloped.
To the south,there are several single-family residences on the east side of the stream.
Farther south, adjacent SR Hwy 101, on the west side of the stream,there are a half-
dozen SFR's located along the estuary at Lilliwaup. Lilliwaup Bay originally extended
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farther inland,but construction of the bridge (SR Hwy 101)has isolated the portion west
of the highway and the river delta above the bridge appears to be filling in with sediment
at a rapid rate (WDOE 2002). Presently, the main channel is severely aggraded
downstream from the proposed project site,in both the upper and lower anadromous
reaches.
The Lilliwaup Creek watershed encompasses 11,408 acres or 17.9 square miles. The
primary water sources for Lilliwaup Creek are extensive wetlands in the upper Lilliwaup
Valley and Price Lake. Anadromous salmon habitat,which is confined to the lower reach
(below the falls)of Lilliwaup Creek, has been degraded by a significant influx of coarse
alluvial sediments over the past seven years. This aggradation has raised the bed of the
creek by 5 to 8 feet through much of(the) anadromous reach(Moore, Martig, Boad
2011). The aggradation to the lower(anadromous)reach and subsequent rise in channel
bed elevation has resulted in hyporheic(subsurface)flows, causing less water to be
available in late summer(when flows are historically lowest) for use by ESA listed Hood
Canal summer-run chum. A significant portion of the Lilliwaup Creek summer flow
water is moving to subsurface flow in the upper anadromous reach(4.48 cubic feet per
second or 23%)and along the western channel of the lower anadromous reach(2.90 cfs
or 45%)of Lilliwaup Creek(Moore, Martig, Boad 2011).
Storms during the winters of 2005/2006 and 2007/2008 caused mass wasting events that
were responsible for the majority of Lilliwaup Creek's recent aggradation problems. In
2005/2006, a steep hillside to the east of the intake area was destabilized by hyporheic
seepage,possible leakage from the existing concrete flume, and heavy rainfall. The
resulting mass wasting event took out a steel support bridge for the concrete flume and
the flume in that area. It is surmised that the initial mass wasting caused a secondary,
downslope slide. Between the 2005/2006 storm and significant storms in the 2007/2008,
it has been estimated that approximately 25,000 to 40,000 cubic yards of coarse alluvial
sediments were transported to the lower reach of Lilliwaup Creek. The most recent study
(Dube 2012) revealed that the primary inputs of coarse-grained sediments to the low
gradient reaches of Lilliwaup Creek have come from the flume slide (16,300 cubic yards
since 2005)and road-related failures in Beardsley Creek(2,300 cubic yards since 1995).
Bank erosion and incision in Winter Creek has added approx. 780 cubic yards of coarse
sediments(Dube 2012). In the winter of 2008,the influx of sediments raised the stream
bed elevation over ten feet in places, resulting in severe erosion to the foundation of the
existing access bridge and damage to the hatchery operated by Long Live the Kings, a
salmon enhancement group. The upper anadromous reach was dredged and the bridge
abutment was protected with large angular rock in the late summer of that same year.
Presently,permitting is underway to dredge the entire anadromous reach of Lilliwaup
Creek.
Lilliwaup Creek is on the WDOE's 2008 Water Quality 303(d)List as an impaired
waterbody for the following parameter: fecal coliform. Hood Canal in the vicinity of
Lilliwaup Creek is listed for the following parameters: fecal coliform and dissolved
oxygen(WDOE 2008). It can be assumed that the existing environmental conditions in
the area have been degraded by development, shoreline hard-armoring, organic and
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inorganic pollutants, deforestation, fishing,and other anthropogenic changes that
accompany urbanization.
III. Effects of the Action
A. Direct Effects
Direct effects are the immediate effects of the project on the listed species and their
habitats (FWS &NMFS 1998). The direct effects to the project site will be:
1. The construction of streambank protection on the east bank of Winter Creek using
large angular rock (three to five man granite) and the installation of an anchor
point.
2. The relocation of Winter Creek,approx. 25 feet to the west, for a length of approx.
100 feet upstream from the stream's discharge point into Lilliwaup Creek, which
will remain at the current location.
3. The placement of additional ecology blocks adjacent to the north side of the intake
structure for protection in the event of extreme flood flows.
1)The construction of streambank protection for approximately 100 feet along the east
bank of Winter Creek will result in an alteration of streambank habitat from the existing
cobble, gravel, and dirt to large angular rock. Sediment recruitment from the immediate
project area will be minimized or cut-off altogether. Since the intake area, Winter Creek,
and the lower reach of Lilliwaup Creek suffer from aggradation,the potential loss of 100
feet of erodible streambank is expected to be insignificant or even beneficial.
2) The relocation of Winter Creek, approximately 25 feet westward, for approximately
100 feet upstream from the discharge point into Lilliwaup Creek, will result in the loss of
native vegetation on the stream's west bank. Following construction, disturbed areas
shall be covered with biodegradable jute netting and replanted with native trees and
shrubs, as per mitigation included in this report. In addition,the relocation is expected to
facilitate fish passage into the stream, as passage is presently impeded by the intake area,
although Winter Creek has not been known to support fish due to a lack of regular flow.
•3) The placement of additional ecology blocks along the north side of the intake
area will occupy an approx. two by twelve feet footprint adjacent the
westernmost end of the existing ecology blocks. The relocation of Winter Creek
will place the ecology blocks landward of the stream's(new)active channel.
Damaged ecology blocks and other manmade debris shall be removed from the
site. The ecology blocks will help to protect the intake area in the event that
heavy seasonal flood flows from Winter Creek overspill the proposed rock
armoring.
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Temporary direct effects caused by the construction process include:
1.Noise.
2. Water pollution from incidental release of fuel, oil, or other contaminants.
3. Turbidity.
1) The main source of construction noise will be the operation of large equipment. The
project site is located in a rural area, in close proximity to SR Hwy 101, so it is expected
that the noise from large equipment will not be more excessive than noise normal to the
neighborhood.
2) Potential water pollution from accidental release of fuel, oil, or other contaminants is
another possible temporary direct effect. As previously discussed, BMPs shall be
implemented during the project to maintain the existing water quality of Lilliwaup and
Winter Creeks and prevent turbidity or pollution.
3) Turbidity is not expected to be an issue as work will be done when Winter Creek is
dry.
B. Indirect Effects
Indirect effects are those effects that are caused by or will result from the proposed
action and are later in time,but are still reasonably certain to occur(50 CFR 402.02).
Indirect effects from this proposed project include:
1. The possible erosion and incision of Winter Creek along the hard-armored section of
streambank.
2. The alteration of natural channel migration processes.
1)The placement of rock bulkhead type armoring along Winter Creek's east bank would
be expected to result in erosion and incision of the streambed;however, due the
depositional nature of Winter Creek at the site, streambed scouring is not expected to be
an issue. The use of large angular rock in the bulkhead project is expected to prevent rock
from being washed downstream by high flows. In addition, large rock will create
interstitial spaces that may be utilized by fish as refuge habitat from flooding in Lilliwaup
Creek.
2)The proposed placement of rock armoring along Winter Creek's active channel is
limited to the east bank. The stream will be free to avulse further westward. Jute matting
will not be placed on the active stream bank.
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C. Conservation Measures
1. No construction to take place at the intake area when Winter Creek is flowing.
2. The WDFW's HPA provisions (specific to the proposed project)and
previously discussed BMPs to be strictly adhered to.
3. All manmade debris to be removed from the site and properly disposed of or
recycled.
4. Disturbed areas of the FWHCA buffers along Winter Creek to be replanted
with native vegetation(see Planting Plan).
A Planting Plan
1. Environmental Goals and Objectives
Restoration of the disturbed FWHCA buffers of Lilliwaup and Winter Creeks shall
consist of placing biodegradable jute matting and hydroseeding the area west of the
resloped west bank, then planting native trees and shrubs(Attachment). Native trees and
shrubs will be planted between the anchor point wall and the parking area. The restored
buffers will improve the functional attributes of the presently disturbed areas to provide
additional protection for critical fish and wildlife species and their habitat, which may be
affected by the proposed project or that has been previously affected by natural events
that occurred at the site.
2. Planting
Bare root or one gallon plants will be installed during the fall or spring of 2012/2013 in
the disturbed buffers of Winter Creek. The hydroseeded area shall be planted in the
spring or fall of 2013. Planting of native trees and shrubs may take place in the
hydroseeded areas after hydroseeding has been completed. Plants shall be installed
using best management practices. Qualified landscapers or foresters who are familiar
with native plants will install them by hand. Organic mulch may be used as required in
the buffer areas. No fertilizer to be applied in the buffer areas. Invasive vegetation shall
be removed from the buffer planting areas before planting commences.
Recommended species are indigenous to the proposed project area. Additional species
approved by Mason County or the WDFW may be used to supplement recommended
species. It is expected that existing native species will contribute to reforestation of the
buffer areas.
The following native trees and shrubs are proposed for installation at 5 feet on center,
randomly in the disturbed buffer areas of Winter Creeks. At least six different species
shall be installed, including three tree species:
15 l (7
Western red cedar(Thuja plicata), Douglas-fir(Pseudotsuga menziesii), Sitka spruce
(Picea sitchensis), Grand fir(Abies Grandis), Western Hemlock (Tsuga heterophylla),
vine maple(Acer circinatum),Pacific willow(Salix lasiandra), Hooker willow(Salix
hookeriana), Scouler willow(Salix scouleriana), and Red-osier dogwood(Cornus
stolonifera).
3. Contingency Plan
The planting plan shall be monitored by a qualified biologist, forester, or landscaper for
three years following installation. In the event that the planting plan is inadequate or
fails, the cause of the inadequacy or failure shall be determined, and then appropriate
corrective measure shall be implemented. Any dead plants shall be replaced. If mortality
is due to too much or too little water or other site-specific conditions,replacement plants
will be chosen that are more tolerant of the existing conditions. Invasive or non-native
plants that are detrimental to the planting project shall be removed by hand until installed
vegetation becomes established.
16
Attachment 1
Vicinity Map.
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Attachment17
The upper falls and intake area(prior to being repaired).
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Attachment 3
The intake area with the aggradation of coarse sediments from Winter Creek visible
inside the concrete intake box and behind the existing ecology block protection(prior to
being repaired).
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Attachment 4
Winter Creek's present channel discharging into Lilliwaup Creek immediately adjacent
the intake facility.
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Attachment 5
The damaged intake area where Winter Creek discharges into Lilliwaup Creek.
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Attachment 6
Winter Creek dry.
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Attachment 7
Winter Creek looking upstream from the intake area at the proposed stream relocation
area on the left.
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