HomeMy WebLinkAboutHMP Habitat Managment Plan - 2/28/2024 Y
Habitat Management Plan
Parcel: 12220-50-90036
260 E Lakeshore Dr
Allyn, WA 98524
Mason County
Report prepared for:
Barbara McFarland
361 E Treasure Island Dr
Allyn, WA 98524
Prepared by:
Rob Nagel
PO Box 2466
Shelton, WA 98584
rob@arctos-environmental.com
(360) 229-3118
ArG+os Environmen+al L.LG
Project: 2024-H M P-001
February 2024
Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
Table of Contents
Overview ............................................................................................................1
PropertyDescription...........................................................................................2
Analysis of Potential Impacts..............................................................................3
Mitigation Measures.......................................... 4
.................................................
Monitoring..........................................................................................................8
Summary ............................................................................................................8
References..........................................................................................................9
List of Figures
Figure1: Vicinity Map .........................................................................................2
Figure2: Site Map...............................................................................................7
Project: 2024-HMP-001 February 2024 Arc_+os Environmental LLG
Habitat Management Plan
12220-50-90036
260 E Lakeshore Dr
Allyn, WA 98524
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
adverse impacts from the unpermitted clearing of vegetation and the proposed
construction of a Single-Family Residence (SFR) within the regulated buffer of a
Category III Lake Fringe Wetland along the shoreline of Lake Anderson. Mitigation
sequencing has been followed to avoid, minimize, and mitigate for impacts to the
buffer area by placing the structure as far from the wetland edge as possible and
proposing mitigation measures designed to offset the potential impacts of
constructing the new SFR on the ecological functions and fish and wildlife habitat
of the wetland buffer. Measures include best-management practices for
construction, noxious weed removal, and planting a mitigation area of±2,000ft2
with native trees, shrubs, and ferns. The objectives of this report are as follows:
• Identify impacts of the vegetation removal and constructing the new SFR
on the wetland 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.
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Project: 2024-HMP-001 February 2024 Arctos Environmental LLC
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Figure 1:Vicinity Map of project
Property Description & Project Background
The parcel is 0.24 acres in size and located in section 19, Township 22 North,
Range 1 West. Virtually all the vegetation on the lot was recently cleared up to
the edge of the wetland. A Notice of Violation for the unpermitted clearing was
received by the property owner. Arctos Environmental LLC has prepared a
Wetland Report as well as this Habitat Management Plan in response to the
Notice of Violation and in support of a forthcoming building permit application.
The entire lot slopes from E Lakeshore Dr on the east, to the shoreline of Lake
Anderson on the west. Vegetation growing within the wetland is dominated by
Cattails (Typha spp.), and Douglas spirea (Spiraea douglasii). Some upland
vegetation observed on the property immediately adjacent to the wetland that
was not cleared is characterized by Salal (Gaultheria shallon), and bracken fern
(Pteridium aquilinum). The property owner also stated that evergreen
huckleberry (Vaccinium ovatum) was among the native vegetation removed from
the upland area of the lot.
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Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
Analysis of Potential Impacts
Vegetated buffers serve an important role in protecting critical public resources
from adverse impacts associated with development, as well as providing fish and
wildlife habitat. Below are the adverse impacts to ecological functions associated
with the vegetation clearing and construction of the proposed SFR within the
wetland buffer.
- Loss of fish and wildlife habitat
The development footprint of the proposed structure within the wetland
buffer is an estimated ±2,000ft2. However, approximately 5,300ft2 of the
wetland buffer was cleared of vegetation, up to the wetland edge. Given
the lot size, it is not possible to replace the same square footage of habitat
affected. Therefore, the mitigation proposed must increase the ecological
functions of the site.
- Impervious surfaces
Increasing impervious surfaces on a lot can increase the amount of storm
water run-off and increase erosion potential. The project proposes
increasing the amount of impervious surface within the buffer by ±2,000ft2.
Mitigation plantings will improve the remaining buffer's ability to filter
sediment and nutrients from any potential runoff from the property. No
increased risk of erosion is anticipated if construction BMPs prescribed in
this report are followed.
- 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 located in a
residential area where human noises are a daily occurrence. Also, no
known nesting sites or individual occurrences of priority habitats and
species have been identified near the project site.
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Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
Mitigation Measures
To avoid, minimize, and mitigate for the adverse impacts identified above, the
following have been identified as appropriate measures for this project:
- Minimizing/avoiding impact
This plan proposes minimizing the impact to the wetland buffer by
keeping the development area modest and constructing the SFR as far
from the wetland edge as practical given the lot's size, shape, and view
constraints.
- Best Management Practices for construction
Construction activities related to this project will be restricted to
favorable weather conditions and best management practices for
reducing disturbance will be followed, including erecting silt fencing
below the project area, and placing straw over any exposed areas until
they are re-vegetated. Any equipment used will be checked daily for
leaks and all fuel, lubricant, and chemicals will be stored off-site.
- Noxious weed removal
All occurrences of Himalayan blackberry on the site will be removed by
hand. As much root material as possible will be removed with the plant.
Weed debris will be bagged and brought to the landfill.
- Mitigation area
A mitigation area of approximately 2,000ftz will be planted with native
trees, shrubs, ferns, and groundcovers according to the planting
guidelines below. The area selected for the mitigation area is
immediately adjacent to the shoreline. The minimum number of native
plants required to be installed in order to satisfy this requirement are as
follows:
o Trees: 20
o Shrubs: 80
o Ferns/ground covers: 125
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Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
- Additional habitat enhancement to improve ecological functions
Within the mitigation area, large-woody debris (LWD) will be placed
immediately adjacent to the wetland/shoreline. The LWD will consist of
a minimum of either two conifer stumps with attached root-balls that
are currently on site from the previous vegetation removal, or two
conifer logs with a minimum diameter of 15-inches and 12ft long.
Planting Guidelines for the Mitigation Area
Earthwork
Machinery earthwork will be restricted to the minimum necessary to implement
this plan; planting holes for specified vegetation installation will be hand dug.
Native Plantings
Native plantings will be installed within the mitigation area parallel to the edge of
the wetland to achieve the following minimum densities:
Trees— 10' on center
Shrubs—±5' on center
Ferns/groundcovers —±4' on center
The plan calls for installing single trees on 10ft centers, and single shrubs on ±5ft
centers. The areas between the trees and shrubs will be filled with ferns or
groundcovers on ±4ft centers. Exact placement of installed materials will be up to
the landscape installer, following the basic spacing pattern described above.
Native plants suitable for the mitigation area include, but are not limited to the
following:
Trees:
Big-leaf maple (Acer macrophyllum)
Western red cedar (Thuja plicata)
Douglas-fir (Pseudotsuga menziesii)
Shrubs:
Sala (Gaultheria shallon)
Oregon grape (Mahonia aquifolium)
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Project: 2024-HMP-001 February 2024 Arc+os Environmen+ol LLG
Vine maple (Acer circinatum)
Evergreen huckleberry (Vaccinium ovatum)
Ferns/groundcovers:
Western swordfern (Polystitchum munitum)
Wild strawberry (Fragaria virginiana)
All planting should occur during winter dormancy. The optimum time for planting
is from November to March.
Installation
Installation of the prescribed vegetation will be performed by experienced
landscapers familiar with planting native vegetation in natural settings.
Installation will be performed during the first winter planting season after
approval of this plan.
Fertilizing
Due to the proximity of the mitigation area to the wetland, NO fertilizer will be
used during plant installation or maintenance.
Maintenance
Maintenance of the installations will be the responsibility of the property owner.
Maintenance is to include any weeding or watering necessary to ensure plant
survival for at least three years after the date of installation.
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APPROVED
MASON COUNTY DCD PLANNING
SITE PLAN REQUIRED TO BE ON SITE
42WXIECT TO APPROVA
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Environmental Consulting I Drone Imagery
t. PO Box 2466
Shelton,WA 98584
(360)229-3118
www.a rctos-environmenta l.com
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Legend
_ February 14,2024
'1-Lake Anderson
Q 2-Regulated 100ft Lake Buffer 3 R2VISO f1:
3-Regulated 115ft Lake Structure Setback
4-Category III Lake-Fnnge Wetland A
5-Regulated Soft Wetland Buffer 6-Regulated 95ft Wetland Structure Setback
--•7-Shoreline Master Program"Commonline"
0 8-Proposed t3,140ft2 SFR(t2,00oft2 within Wetland Buffer) N
9-Proposed Driveway
0 10 20 30 40 It
10-Proposed Mitigation Area(f2,00W) This is not a survey map. ♦ 1 I I
11-Proposed Oft Trail for Lake ACCe55 Measurements are approximate and
'I H' 7
CD Approximate Parcel Boundaries must be field verified. Scale:�"=
Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
Monitoring
An "as-built" monitoring report will be submitted to the Mason County Planning
Department when all construction is complete and mitigation measures have
been implemented. This initial report will establish photo points and document
the location and general size of installed vegetation. An annual monitoring report
will also be submitted to the county for 3 years to document the success of the
mitigation area. If the survival rate of installed vegetation falls below 80% in the
first three years, the area will be re-planted to meet the original target densities.
The 80% threshold will be assessed annually at each monitoring visit and
replanted the following planting season if required. The reports will also include
photos from the photo points established in the baseline monitoring report and
document any occurrence of noxious weeds in the vicinity of the project site or
mitigation area. Any noxious weeds observed will be removed.
Summary
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
adverse impacts from the clearing of native vegetation and proposed construction
of a SFR within the regulated buffer of Category III Lake Fringe Wetland.
Mitigation measures have been designed to offset the identified impacts of
constructing the proposed SFR on the ecological functions and fish and wildlife
habitat of the wetland buffer. Measures include best-management practices for
construction, noxious weed removal, and planting a ±2,000ft2 mitigation area
with native vegetation. Proper implementation of this plan will result in no-net-
loss of ecological function to the buffer from the vegetation removal and
development proposed by the applicant.
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Y Project: 2024-HMP-001 February 2024 Arc+os Environmental LLG
References
Guard,J. 1995.Wetland Plants of Oregon &Washington. Lone Pine Publishing. 240 pp. Edmonton,
Alberta, Canada.
Hruby,T. (2014). Washington State Wetland Rating System for Western Washington: 2014 Update.
(Publication#14-06-029). Olympia,WA:Washington Department of Ecology.
Munsell Color(Firm). (2009). Munsell soil color charts:with genuine Munsell color chips. Grand Rapids,
MI
Pojar,J. and A. MacKinnon. 1994. Plants of the Pacific Northwest Coast(Revised Edition 2014). Lone Pine
Publishing. 528 pp.Vancouver, British Columbia, Canada.
United States Department of Agriculture, Natural Resources Conservation Service. 2010. Field Indicators
of Hydric Soils in the United States,Version 7.0. L.M.Vasilas, G.W. Hurt, and C.V. Noble (eds.).
USDA, NRCS, in cooperation with the National Technical Committee for Hydric Soils.
U.S. Army Corps of Engineers 2020. National Wetland Plant List,version 3.4, http://wetland-
plants.usace.army.mil/U.S.Army Corps of Engineers, Engineer Research and Development
Center Cold Regions Research and Engineering Laboratory, Hanover, NH
U.S.Army Corps of Engineers. 2010. Regional Supplement to the Corps of Engineers Wetland
Delineation Manual: Western Mountains,Valleys, and Coast Region (Version 2.0),ed.J. S.
Wakeley, R. W. Lichvar, and C.V. Noble. ERDC/EL TR-10-3.Vicksburg, MS: U.S.Army Engineer
Research and Development Center.
Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species List. Olympia,
Washington. 292pp.
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