HomeMy WebLinkAboutHabitat Management Plan for BLD2022-00829 - HMP Habitat Managment Plan - 12/30/2021 • a e7LO R���—
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Parcel: 32127-54-00072 cF-NE0
XXX E Olde Lyme Rd JtjN 19 2022
Shelton, WA 98584 W Adder Street
Mason County 05
Report prepared for:
Deann Rodius
70 E Hickory PI
Shelton, WA 98584
Prepared by:
Rob Nagel
680 E Philura Ln
Shelton, WA 98584
arctosaerial@gmail.com
F (425) 344-9315
(360) 229-3118
�XA RCTOS
AERIAL
Environmental Consultation I Drone Imagery
Project: 2021-H M P-013
December 2021
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F Project: 2021-HMP-013 December 2021 AERIAL
Table of Contents
Overview................................................................................................................1
PropertyDescription ..............................................................................................2
Analysis of Potential Impacts.................................................................................3
MitigationMeasures..............................................................................................4
Monitoring ...........................................................................................................10
Summary..............................................................................................................10
References............................................................................................................11
List of Figures
Figure1: Vicinity Map ............................................................................................2
Figure 2: Map depicting parcel & buffers...............................................................3
Figure3: Site Plan...................................................................................................9
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Project: 2021-HMP-013 December 2021 ARCTOSALRIAI
Habitat Management Plan
32127-54-00072
XXXEOldeLyme Rd
Shelton, WA 98584
Overview
This report details a Habitat Management Plan (HMP) for the above referenced
property in Mason County, Washington. The purpose of this report is to address
potential adverse impacts from the construction of a proposed Single-Family
Residence (SFR) within the buffer of a fish-bearing (Type-F) tributary to Cranberry
Creek. Mason County requires a 150-foot buffer with an additional 15-foot
building setback, which encompasses most of the parcel. The SFR (±2,360ft2) is
proposed 85-feet from the ordinary high-water mark (OHWM) of the stream, at
its closet point. This plan proposes a reduction of the stream buffer to an
averaged 87.5ft (75ft at its closest and 100 ft at its farthest) to allow for
reasonable use of the property. Mitigation measures have been designed to
offset the potential impacts of constructing the SFR within the buffer, resulting in
no-net-loss of ecological functions and fish and wildlife habitat of the remaining
stream buffer. Measures include enhancing the remaining ±9,800ft2 of stream
buffer with noxious weed removal, selective tree plantings, and large-woody
` debris (LWD) placement. The objectives of this report are as follows:
• Identify potential impacts of the construction of the proposed structure
within the stream buffer on the buffer's ecological functions and fish and
wildlife habitat.
• Determine mitigation measures that would offset those impacts and result
in no-net-loss to ecological functions and fish and wildlife habitat within the
remaining buffer.
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Project: 2021-HMP-013 December 2021 AERIAL
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Figure 1:Vicinity map of project.
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Property Description & Project Background
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The subject parcel is 0.43 acres in size and located in the NE% of the SEX of
section 27, Township 21 North, Range 3 West. The site is sloped down to a type-F
stream and Class IV wetland that exists adjacent to the lot's northern boundary
line. The lot is currently characterized by mature Douglas fir, western hemlock,
and western red cedar on the upper half of the slope. The lower half of the slope
adjacent to the stream/wetland has understory plants, with few trees. Invasive
scotch broom is scattered throughout the property.
Mason County requires a 150ft buffer on Type-F streams with an additional 15ft
structure setback, which encompasses most of the subject property. This lot was
established before the effective date of the Mason County Resource Ordinance
and is therefore considered a non-conforming lot. The property owner lacks a
reasonable use of the property without the proposed buffer reduction. Also, this
proposal would not interfere with current traffic patterns.
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Project: 2021-HMP-013 December 2021 ARCTOSAERIAL
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Figure 1:Map showing the fish bearing(Type-F)stream,the regulated 150'stream buffer as the solid yellow line,the 165'
stream structure setback as the dashed yellow line,the regulated 50'class IV wetland buffer as the solid purple line,and the 65'
wetland structure setback as the dashed purple line.
Analysis of Potential Impacts
Vegetated buffers serve an important role in protecting critical public resources,
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as well as fish and wildlife habitat from adverse impacts associated with
development. Below are the potential adverse impacts to ecological functions
associated with the construction of this proposed structure within the stream
buffer.
- Increased storm-water runoff and erosion
Impervious surfaces such as roofs and driveways contribute to increased
flow of runoff during storm events. This increased flow could contribute to
erosion and increased sediment reaching the stream without a proper
storm water management plan. The proposed building site is limited to
±2,360ft2 and roof run-off will be dispersed without concentrating flow.
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Project: 2021-HMP-013 December 2021 AERIAL
- Loss of wildlife habitat
The development footprint of this structure within the buffer is limited to
±2,360ft2 for the SFR. Mitigation measures, including native plantings and
LWD placement, will increase the amount of wildlife habitat adjacent to the
development site and increase the species richness and structural diversity
of the remaining riparian area.
- Increased disturbance from noise pollution
A temporary increase in noise from construction activities is likely to occur.
but activities will be limited to daylight hours, and the project is in a
residential area where human noises are a common occurrence. Also, no
known nesting sites or individual occurrences of priority habitats and
species have been identified near the project site.
- Increased Solar input
Clearing for the proposed structure may increase solar input in the short
term, but maturation of the mitigation measures will have a longer-term
4 benefit of reducing solar input to the stream.
a Mitigation Measures
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To avoid, minimize, and mitigate for the potential adverse impacts identified
above, the following have been identified as appropriate measures for this
project:
Minimizing/avoiding impact
The proposed project cannot avoid the impact to the stream buffer
because the buffer encompasses almost all of the parcel and no other
feasible options exist. The proposal avoids impacting the wetland buffer
and minimizes the impact to the stream buffer by minimizing the size of
the SFR to ±2,360ft2 and placing the structure as far from the stream as
feasible, at 85ft from the edge of the stream/wetland. There is not
enough room to fit the structure any farther from the stream because of
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the front lot line setback.
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Project: 2021-HMP-013 December 2021
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Best Management Practices for construction
Construction activities related to this project will be restricted to
favorable weather conditions and best management practices for
reducingdisturbance and erosion will be followed including placing
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straw over exposed areas, and erecting silt fencing below the project
area. Equipment will be checked daily for leaks and all fuel, lubricant,
and chemicals will be stored outside the stream buffer.
- Clustering of development
All activities related to this project will be clustered to the extent
possible without impacting more of the stream buffer than necessary.
Equipment and materials will be parked/stored outside the shoreline
` t buffer when possible.
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- Removal of invasive species
All occurrences of noxious weed species observed in the vicinity of the
project site and mitigation area will be mechanically removed without
the use of chemical herbicides, including the scotch broom observed
within the stream buffer.
- Shoreline buffer enhancement & re-vegetation
A mitigation area of ±9,800ft2 within the stream and wetland buffers will
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nh removing I occurrences of invasive species and
bee enhanced by re o gal ccu p
selectively placing LWD to increase structural diversity and wildlife
habitat. To satisfy this requirement, a minimum of 25 logs must be
placed throughout the mitigation area. The logs must be a minimum 10"
diameter and 15ft long. At least 5 of the required logs must have intact
root-balls still attached. Approximately 4,500ft2 of the mitigation area
` will be planted with native trees in an area where only shrubs and
herbaceous plants are currently. To satisfy this requirement, a minimum
of 45 trees need to be planted. Equipment within the reduced buffer
area is prohibited except as necessary to place the LWD.
Additionally, any landscaping within the lot area is restricted to consist
of native plant species typically found in undisturbed riparian areas.
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Project: 2021-HMP-013 December 2021 ,x- , AERIAL
Species selected will include common riparian vegetation not currently
on the property which will result in a net increase in species richness
and biodiversity within the buffer.
Planting Guidelines for the Mitigation Area
Earthwork
Machinery earthwork will be restricted to the minimum necessary in order to
implement this plan; planting holes for specified vegetation installation will be
hand dug.
Native Plantings
Native tree plantings will be installed within the mitigation area parallel to the
edge of the stream/wetland to achieve a minimum density of 10ft on center.
Trees installed will be flagged to assist in monitoring audits. Volunteer native
vegetation can be counted towards the target densities of the restoration area
after the initial monitoring audit. Trees to be planted are limited to shade tolerant
western red cedar (Thuja plicata) and western hemlock (Tsuga heterophylla).
All planting should occur during winter dormancy. The optimum time for planting
is from November to March.
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Installation
Installation of the prescribed vegetation will be performed by experienced
landscapers familiar with planting native vegetation in natural settings.
Installation can be performed before construction on the property is completed
since the mitigation area will not interfere with construction.
Fertilizing
Due to the proximity of the mitigation area to the stream, NO fertilizer will be
used during plant installation or maintenance.
Maintenance
Maintenance of the installations will be the responsibility of the landscape
installer. Maintenance is to include any weeding or watering necessary to ensure
plant survival for up to 5 years after the date of installation.
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Project:2021-HMP-013 December2021 X AERIAL
Regulated 150ft ARCTOS
Stream Buffer
AERIAL
Regulated 165ft Environmental Consulting I prone Imagery
Structure Setback
PO Box 2466
Shelton,WA 98584
(425)344-9315
aa, a arctosaerial@gmail.com
a N � � � www.arctosaerjaLcom
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Mitigation Area
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�? Map created by:Rob Nagel
January 6th, 2021
Revison:
, ,. 0 20 40 60 80 ft
Regulated 50ft Regulated 65ft
Wetland Buffer Structure Setback Scale: 1" = 30' 9
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Project: 2021-HMP-013 December 2021 X, AERIAL
Monitoring
Following the implementation of the mitigation measures, an annual report will
be submitted to the county planning department for 3 years post construction.
The report will detail the presence of new, or the reoccurrence of any invasive
species. Invasive species found on site will again be removed mechanically, using
hand tools only to reduce disturbance to the stream/wetland buffer. The annual
report will also document the planting success of the mitigation area. If planting
survival in the mitigation area falls below 90% in the first three years after
x installation. The area will be re-planted to meet the target densities.
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If any failures of mitigation measures are identified during the annual inspection,
corrective actions will be recommended in the report and will be taken by the
property owner to restore them to working order as soon as possible.
Summary
This report Identifies potential impacts of the construction of a proposed 2,360ft2
SFR within the regulated buffer of a Type-F stream. Mitigation measures have
been proposed to avoid, minimize, and mitigate for those impacts on the stream
buffer's ecological functions and fish and wildlife habitat. Successful
implementation of the proposed mitigation measures will result in a no-net-loss
of the stream and its buffer's ecological functions, structural diversity, and species
richness. Mitigation measures include enhancing ±9,800ft2 of existing buffer
through noxious weed removal, selective placement of LWD, and planting of
native tree species in an area lacking over-story vegetation.
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Project: 2021-HMP-009 June 2021X, AERIAL
References
Guard, J. (1995). Wetland Plants of Oregon &Washington. Lone Pine Publishing. 240 pp. Edmonton,
Alberta, Canada.
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Pojar,J. and A. MacKinnon. 1994. Plants of the Pacific Northwest Coast (Revised Edition 2014). Lone Pine
Publishing. 528 pp. Vancouver, British Columbia, Canada.
WDFW. 2002. Integrated streambank protection guidelines. Washington Department of Fish and
Wildlife, Washington Department of Transportation, and Washington Department of Ecology.
Posted on Washington Department of Fish and Wildlife web site:
https://wdfw.wa.gov/sites/default/files/publications/00046/wdfw00046.pdf
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