HomeMy WebLinkAboutHMP for Existing Development - HMP Habitat Managment Plan - 4/16/2003 � Y r
Habitat Managcmcnt Plan for the Proposed and Existing Development
8371 SR 106 Union, Washington 98.592
Parcel 32234-44-00000
Prepared for Jerry Vermillion
jREC U1VEC
E
1 6 2003
MCCD - PLANNING
1,ce Boad
Habitat Management Planning
PO Box 2854
Belfair Washington 98528
(360)-620-0618
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Habitat Management Plan
Tax Parcel No. 32234-44-00"
Union Washington
Introduction
The following is a Habitat Management Plan for the improvement of an existing
residence established within the protected marine shoreline buffer of!-food Canal. This
area also falls within the buffer associated with the lower section of an unnamed type TV
stream and associated wetland. Existing circumstances on site moreover include a ruck
bulkhead within marine shoreline management zone, added fill within wetland cone and
associated buffer, and the esLahlishment of a fence and storage structure within the
Protected riparian zone of the type IV stream. The information in this report was
compiled following a field inspection completed on March 23, 2003, The purpose of this
plan is to mitigate or correct existing circumstances (rock bulkhead, wetland fill, fence
and storage within riparian) as well as identify a reasonable avenue for responsible
development while maintaining the objectives of the Mason County Resource Ordinance.
identified Conditions
The portion of the parcel north of Highway 106 has a~mall cabin with a deck, concrete 1
bulkhead, and a pier/ramp/float. A gravel parking area is situated southeast of the cabin.
The protected buffer encompassing the lot is associated with the marine shoreline and a
ditched spring fed type IV system draining into Hood Canal with the mouth located east
of the residence. The riparian zone encompassing the upper section of the stream (above
the subject property) is dominated by a mature second growth forest while the riparian
zone occurring on the subject lot is still in more primary successional development due to
the history of impacts (stream relocation, vegetation removal, till, etc.). The history of
this project coupled with information already provided by Agua Tierra Environmental
Consulting, Inc. make further detailed description cif species information associated with
Hood Canal and plant diversify on site seemingly redundant. There are no active nesting
sites for species of concern or documented spawning of endangered species within the
property according to the Washington Department of Fish and Wildlife Watershed
Inventory and Analysis and the Priority Habitat and Sensitive Species database.
The existing channel drains out of'the hillside located south of Highway 106 where it
enters a ditch on the south side of the road. The water flows west through the ditch until
it drains under the road through a culvert and east again before it enters Hood Canal. Tt
appears that this ditch is dredged in order to maintain its efficiency at passing stormwater
from highway 106 and the hillside south.
Project Summary
Impacts to present and future riparian and aquatic habitat have been considered in
reviewing the proposed building improvement within the designated fish and wildlife
conservation areas, Additional issues on site require a more large scale approach to
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restoration of critical areas. The intent of this plan is to maintain and enhance the
following habitat characteristics on site.
- Wildlife habitat and plant diversity
- Stream Cover
- Aquatic conditions (water quality, sediment, etc.)
- Fine sediment stabilization
- Surface runoff retention
- Present and future LWD recruitment to marine and freshwater habitat
- Natural slope elevation contours
Construction Mitigation or Correction
Proposed 910 sq ft cabin addition 300 ft shoreline vegetation restoration and
exotic species removal
Existing Bulkhead Remove eastern 14 ft, re-establish natural
shoreline contours and adopt bioengineering
techniques.
Wetland Fill/Path Expansion Relocate path, remove Frill, reestablish
natural slope elevation contours, restore
wetland
Fence and storage structure Restore/enhance riparian habitat between
fence and ditched stream
910 sq ft Cabin Addition:
The entire proposed 910 sq ft cabin addition lies within the marine shoreline buffer while
approximately 760 sq ft of the project lies within the stream bLr1'1'cr. The nearest point of
the structure will lie approximately 25' from the stream and 20' from the marine 01-1M.
Although approximately 443 sq ft of the project lies within the wetland buffer, the
jurisdictional status of'the wetland has not been confirmed. The wetland boundaries on
site under normal circumstances appear to be less than 2,500 sq ft(non jurisdictional in
Mason County) while the connected wetland habitat upstream of the culvert has been
created and maintained as a drainage ditch which does not qualify as a managed wetland
according to the Washington Department of Ecology 1997 Wetlands Identification and
Delineation Manual. However, the importance of the wetland must be considered despite
its small size.
Im acts
Impacts to vegetation will be negligible considering that no vegetation exists within the
building zone. None of the proposed building actions will adversely impact listed salmon
species to any measurable degree. Increase in noise is anticipated during construction
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however the project is located more than 2,600 feet from any nesting site and no roosts
are documented within the radii of concern. Suspended sediment increase within the
project area is of minimal concern due to the soil characteristics on site.
Mitigation: attachement B
Due to the large ownerships adjacent to the property, the existing landowners have a
unique opportunity to implement restoration at a larger scale than what is most common
on Hood Canal. Responsible development within critical areas must include taking
advantage of such restoration opportunities. East of the project site there will be
extensive exotic species removal coupled with conifer plantings that will cover a 300-foot
stretch of shoreline between the OHM and Highway 106. This will all occur on a
relatively steep slope, however, the occurrence of overstory trees further east on similar
, )pes indicate certainty that this will be successful in restoring a contributing bluff that
would eventually provide terrestrial habitat structure to the shoreline as well as Large
Woody Debris and nutrients to the aquatic system. This will eventually provide the
necessary mechanism~ to improve and maintain the present and future shoreline habitat
conditions beneficial to several fish and wildlife species.
i
Wetland Fill and Path Expansion:
to an attempt to maintain access to adjacent shoreline property via a motorized ATV, the
existing landowner placed fill in sections of the category III wetland and associated
riparian of a type IV stream. The path was constructed over the wetland within 5-10' of
the small stream. Fill was also placed outside suspected wetland boundaries into
nearshore boundaries.
impacts
The ecological importance of wetlands is becoming better understood as reflected
through land use regulations, management practices, and restoration efforts that have and
continue to evolve in our society. Detailed description of wetland functions and their
importance to plant, fish, and wildlife species seems unnecessary given the intent of this
report. Further detailed description of the importance of this particular wetland can be
made available upon request if necessary. The impact of the existing project on site iti
that a portion of the wetland is now gone.
Project Correction: attachement B
Although this is a small wetland, it must be recognized that it is still important and must
be restored to previous normal circumstances (Vegetation, Soil, Hydrology), One must
consider that the Hood Canal watershed is characterized by several of these small
wetlands that collectively make an extremely significant contribution to the overall
terrestrial and aquatic conditions throughout the area.
All Ii11 is to be removed from the identified wetland zone or areas suspected to have
upheld wetland characteristics prior to development activities. The wetland zone is to be
delineated and flagged following fill removal. Natural slope contours are to be
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reestablished to the extent feasible. Areas of till removal and landscape contour
rcestablishment are to be replanted with wetland species characteristic of the site. A list
of species to use and planting protocols is provided.
The existing ATV trail adjacent to the stream is to be moved out of the wetland zone to
the non wetland area that exists an equal distance between the stream and the marine
OHM. This path is not to exceed 4-feet in width.
i:xistine Rock Bulkhead:
Under the verbal guidance and recommendation of Mason County officials and the
Department of fish and wildlife, the landowner installed an additional rock bulkhead to
prevent fill from washing out of the existing concrete bulkhead. Roughly 40-feet of rock
was placed adjacent to the east side of bulkhead. This was more than was recommended
and was completed without undergoing formal permit review.
impact
Bulkheads tend to block fine sediments from entering drift cell transport zones along
beaches. They can also increase wave energy, coarsening the sediments fronting them,
which decreases spawning habitat quality for forage fish such as Sandlance. It must be
considered that the majority of the existing rock wall sits above the OHM, its main
function is to retain material , and not to block tidal movement. However, there is a
significant separation in shoreline connectivity to upland habitat associated with the
existing rock wall. This results in a more Abrupt habitat edge as opposed to a more
naturally gradual transition that would have been historically associated with the site.
Project Correction: attachement C
The eastern 14-feet of the rock wall is to be removed and replaced with a series of filled
sandbags that taper gradually down to the shoreline elevation in a fashion that mimics
more natural contours. Sandbags placed on the surface will have perforations with native
vegetation emerging that will eventually become established on this slope. This will
reestablish more natural slope elevation contours and restore connectivity between
shoreline and upland habitat zones. It will also more adequately dissipate wave energy
during extreme high tides.
Fence and Storage Structures:
South of Highway 106 the landowner has constructed a 50' long fence and proposes to
place two 10' by 20' storage containers on site. The fence and proposed storage
containers occur within the protected buffer of a ditched type TV Stream that runs parallel
to Highway 106. The ditch is maintained by Mason County as drainage for Highway
106.
Impact
Considering the circumstances created and upheld by the maintenance and public use of
the county right of way, the establishment of the fence and proposed storage structures
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will have no additional negative impacts on existing riparian or aquatic conditions on site.
The ecological significance of this stream section is minimal as this is a man made ditch
that a natural stream has been diverted into. Impacts to stream and riparian habitat
associated with maintenance of the road likely exceed any impacts caused by the
proposed development.
Mitigation: attachement A
Woody vine species are to be planted along the hillside between the ditch and the fence.
Because of the proximity to the road and powerlines, overstory trees would eventually be
a concern to the maintenance associated with the county right of way. Planting protocols
and species to use are listed below.
Plants that may be used within restoration areas include the following;
Plant Species Habitat 'I'vae/Location
Salmonberry (Rubus speu:rabolis) Between fence and road
Pacific Willow (Salix sitchensis) Between fence and road
Red alder(Alnus rubra) Wetland
Western red-cedar (Thirja plicata) Wetland and shoreline slope
Douglas fir (P.Yeudotsuga menziesii) Shoreline slope
Skunk-cabbage (Lysichilon arnericanurn) Wetland
Sword fern (Polystichuni muniturn) Adjacent to Wetland
Overstory trees will be planted approximately 10-12 feet apart in a random pattern.
Shrubs and woody vines are to be planted 2-4 feet apart in a random pattern as well.
Exotic species removal wi I I occur throughout the shoreline restoration zone. This allow
natural riparian succession and other ecological processes to transpire while the native
plantings will expedite the recovery process and prevent future exotic species problems,
Schedule for Restoration
The restoration of the identified area will commence and be completed by April of 2004.
All exotic species located within restoration zones will be removed and disposed of. All
trees and shrubs will be planted as described above and flagged in order to locate them at
a later date for necessary maintenance,
Monitoring
Monitoring of the site will begin in the fall of 2005 and maintained on a seasonal bads.
The information gathered will provide the following: 1) condition of reintroduced plant
species; 2) the use of the site by wildlife species; 3) any disturbance and its effect on the
restoration effort; 4) any occurrence or exotic species; 5) any corrective measures that
may be deemed necessary to provide the desired restoration outcome. This monitoring
will be in effect for the duration of three years. The information gathered will be
provided in an annual report and submitted to the Director of Mason County Department
of Community Development if necessary.
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A map is enclosed which provides the geographical location of the site in relation to
Hood Canal. A plot map is also enclosed which shows the proposed building and buffer
locations in relation to critical area boundaries.
I trust this information is sufficient for your needs at this time. Thank you for choosing
me as your environmental consultant. if you have any questions feel free to call.
i
Lee Boad
Habitat Management Planning
P4 Box 2854
Belfair, WA 98528
360-620-0618
6
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