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Home My WebLink AboutSHX2024-00039 - HMP Habitat Managment Plan - 7/31/2024 5 Hx 2a2� 000 3 a Habitat Management Plan Parcel: 51901-50-01069 1230 W Lakeside Dr Shelton, WA 98584 Mason County, WA Report prepared for: Vicki Youngs 1230 W Lakeside Dr Shelton, WA 98584 Prepared by: Rob Nagel PO Box 2466 Shelton, WA 98584 rob@arctos-environmentaLcom (360) 229-3118 Arctos Environmental LLG Project: 2024-H M P-012 July 2024 Project: 2024-HMP-012 July 2024 Arc-to-, Environmental LLG Table of Contents Overview............................................................................................................1 PropertyDescription...........................................................................................2 Analysisof Potential Impacts..............................................................................3 MitigationMeasures...........................................................................................3 Monitoring..........................................................................................................8 Summary............................................................................................................8 References..........................................................................................................9 Appendix: Site Photos.......................................................................................10 List of Figures Figure1: Vicinity Map.........................................................................................2 Figure1: Site Map...............................................................................................7 i Project: 2024-HMP-012 July 2024 Ar-ctos Environmental LLG Habitat Management Plan 51901-50-01069 1230 W Lakeside Dr Shelton, WA 98584 Overview This report details a Habitat Management Plan (HMP) for the above referenced property in Mason County, Washington. The property owner is applying for an After-The-Fact (ATF) permit for the capping of an existing concrete bulkhead and the construction of a ±240ft2 dock on the shoreline of Lost Lake, in Mason County, Washington. The purpose of this report is to address the adverse impacts of those unpermitted developments. The property owner is also applying for a building permit for a Single-Family Residence (SFR) that will be located outside the shoreline buffer area. Mitigation measures have been designed to offset the impacts of capping the bulkhead and constructing the dock on the ecological functions and habitat of the shoreline buffer. Measures include best-management practices for construction, noxious weed removal, gravel removal, and planting a mitigation area of±400ft2 with native trees, shrubs, and ferns. The objectives of this report are as follows: • Identify the impacts of capping the bulkhead and constructing the dock on the shoreline buffer's ecological functions and habitat. • Determine mitigation measures that would offset those impacts and result in no-net-loss to the ecological functions of the shoreline. 1 Project: 2024-HMP-012 July 2024 Arctos Environmental LLG �8 Figure 1:Vicinity Map of project. Property Description & Project Background The subject parcel is 0.3 acres in size and located in section 1, Township 19 North, Range 5 West. The lot slopes from W Lakeside Dr. east to the shoreline of Lost Lake. The lot has an existing septic system, paved driveway, garage, and concrete patio located outside the 100ft lake buffer area. A deck, garden shed, wood platform, garden fence, ±34ft concrete-block retaining walls, concrete-block bulkhead, and 240ftz dock exist within the 100ft lake buffer area. This project proposes removing the garden fence, garden shed, and wood platform from the buffer area and is seeking an ATF permit for the capping of the existing bulkhead and the dock. The dock is currently decked with solid, composite decking and no grating. The shoreline buffer area is composed of a large number of native shrubs and sapling native trees mixed with ornamental plantings. Problematic noxious weeds observed along the shoreline include yellow-flag iris (Iris pseudacorus) and English ivy (Hedera helix). 2 Project: 2024-HMP-012 July 2024 Arc-to-, Environmentol LLG Analysis of Potential Impacts Intact, vegetated shorelines and 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 potential adverse impacts to ecological functions associated with the bulkhead capping and dock construction on Lost Lake. Impacts to fish and wildlife habitat The primary adverse impact these actions have on the shoreline's ecological functions is the alteration of the shallow water fish habitat along the shoreline. The existing bulkhead was already interfering with the natural sediment recruitment and movement along the shoreline. The capping of the bulkhead further restricts sediment recruitment and increases the thermal mass of the bulkhead. The removal of vegetation and large-woody debris (LWD) along the shoreline reduces cover and foraging opportunities for native fish. This can also raise the temperature of the micro-climate near the bulkhead which may make it less suitable for the life-history requirements of native fish (Kahler et al. 2000). Overwater structures that reduce ambient light levels have been shown to have an adverse impact on species and habitats in freshwater lakes (WDFW. 2001) Current federal and state regulations require functional grating to allow light penetration. 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 Since this project is for an ATF permit, impacts to the shoreline cannot be avoided. This project proposes minimizing impacts to the shoreline by removing the solid decking of the dock and replacing it to meet current state and federal functional grating requirements. 3 Project: 2024-HMP-012 July 2024 Arc+os Environmental LLG - Clustering of development All activities related to this project will be clustered to the extent possible without impacting more of the shoreline buffer than necessary. Equipment and materials will be stored outside the buffer when not immediately necessary for construction activities. - Noxious weed removal All occurrences of English ivy and yellow-flag iris on the lot 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. - Retaining wall modification The existing ±3-4ft retaining walls within the shoreline buffer will be reduced to 2ft maximum. Any surplus fill from this modification will either be removed from the site or used for re-grading in the mitigation area where rock will be removed. - Shed, platform, and garden fence removal The garden shed, platform, and fence will be removed from the shoreline buffer and the area will be replanted with native trees and shrubs. The minimum number of plants required to be installed after their removal in this area are as follows: o Trees: 4 o Shrubs:16 o Ferns/ground covers:25 - 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. 4 Project:2024-HMP-012 July 2024 Arc-to-, Environmentol LLG - Mitigation area A ±400ft2 area along the shoreline currently maintained in gravel will be planted with native trees, shrubs, and ferns according to the planting guidelines below. The rock in this area will be removed and re-graded to match the surrounding grade. If fill is necessary, in this ±400ft2 portion of the mitigation area, it must be certified weed free or come from on- site. Shrubs will be planted along the shoreline and encouraged to overhand the bulkhead to provide habitat benefits along the shoreline. The minimum number of native plants required to be installed in order to satisfy the planting requirements are as follows: o Trees: 4 o Shrubs: 25 o Ferns/ground covers: 44 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 shoreline/bulkhead to achieve the following minimum densities: Trees — 10' on center Shrubs —±4' on center Ferns/groundcovers — ±4' on center The plan calls for installing single trees on 10ft centers, and single shrubs on ±4ft 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. Trees may be installed within 10ft of existing mature trees on site. Installed plants must be flagged to aid in monitoring visits. Native plants suitable for the mitigation area include, but are not limited to the following: 5 Project: 2024-HMP-012 July 2024 Arctos Environmental LLG Trees: Western red cedar (Thujo plicata) Big leaf maple (Acer macrophyluum) Shrubs: Salal (Gaultherio shallop) Oregon grape (Mohonio aquifolium) Vine maple (Acer circinatum) Evergreen huckleberry (Vaccinium ovatum) Ferns/groundcovers: Western swordfern (Polystitchum munitum) Wild strawberry (Fragaria virginiana) Kinnikinnick (Arctostaphylos uva-ursi) 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. Installed plants will be flagged to aid in monitoring requirements. Fertilizing Due to the proximity of the mitigation area to the shoreline, 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 five years after the date of installation. 6 Project:2024-HMP-012 July 2024 Arc4os Environmen+ol LLG Arc_+o-i Environmen+ol LLG Environmental Consulting l Drone Imagery PO Box 2466 Shelton,WA 98584 (360)229-3118 www.arctos-environmental.com L Ln ¢ o ° 00 9 O (� CY) >� > > > >O x LLI O dJ i � r Map created by:Rob Nagel " June 28,2024 Legend a Revison: w 1-Proposed Single-Family Residence(SFR) 2-Existing Shed&Platform(to be removed) ®3-Existing Garden Fence(to be removed) ®4-Existing dock(240ft2) 5-Lost Lake 6-100ft Lake Buffer 'V 7-115ft Lake Structure Setback 0 15 30 45 60 ft 8-Common line This is not a survey map. 9-Proposed Mitigation Area(t400ft2) Measurements are approximate and Q Approximate Parcel Boundaries must be field verified. Scale: "" = 25" 7 Project: 2024-HMP-012 July 2024 Arctos Environmentol LLG Monitoring A baseline monitoring report will be submitted to the Mason County Planning Department when all construction is complete and mitigation measures have been implemented. This initial "as-built" 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 5 years to document the success of the mitigation area. If the survival rate of installed vegetation falls below 90% in the first five years, the area will be re-planted to meet the original target densities. The 90% 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 identifies potential adverse impacts associated with the unpermitted development on the subject lot within the regulated shoreline buffer of Lost Lake. Mitigation measures have been designed to offset the potential impacts of the development on the ecological functions and fish and wildlife habitat of the shoreline buffer. Measures include removing unpermitted infrastructure, modifying existing retaining walls and the dock to current regulatory requirements, best-management practices for construction, noxious weed removal, and planting a ±400ft2 mitigation area with native vegetation in an area along the shoreline currently maintained in gravel. Proper implementation of this plan will result in no-net-loss of ecological function to the buffer from the development proposed by the applicant. 8 Project: 2024-HMP-012 July 2024 Arc-to-, Environmental LLG References Guard,J. 1995.Wetland Plants of Oregon &Washington. Lone Pine Publishing. 240 pp. Edmonton, Alberta, Canada. Kahler,T., M. Grassley, and D. Beauchamp. 2000.A Summary of the Effects of Bulkheads, Piers and other Artificial Structures and Shorezone Development on ESA-listed Salmonids in Lakes. Final Report prepared for the City of Bellevue. Penttila, D. (2007). Marine Forage Fishes in Puget Sound. Puget Sound Nearshore Partnership Report No. 2007-03,Seattle, WA. 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:Hwdfw.wa.gov/sites/defau It/files/publications/00046/wdfw00046.pdf WDFW. (2001). Over-Water Structures: Freshwater Issues. 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/defau It/files/publications/00052/wdfw00052.pdf 9 Project:2024-HMP-012 July 2024 Arc-to-, Environmentol LLG Appendix: Site Photos p b Site Photo 1:Drone image of the shoreline area on the subject lot. 10 �w i �lfJ d, . a s a '•aY.� a �„�.,,�,�7 � •`� �`, �' $ .,'` , ' �A ., ° '�Y„P•n+«-' ¢ +°�. �'�.. �E �� • • `yam � � r t a m , 1 1 /I- I I I • I / 'I I I I I I I crX^ E .o-t, gym.• '.aWw„ � "'"-°� r � `,��RD�vtp� § R�:, � .> 9• �" h,ss�', '� s' 'vk1. �`� �-�� 'S° y 41 T , �y y. a .v< ,,:Vim' �G s j., � �'� - iY d • ,..'mot. t Y R y, +r sew ffi r I I I I I I I I I I I I I' • I Project:2024-HMP-012 July 2024 Arctos Environmentol LLG u r A a. k- r x Site Photo 5:Image showing the existing garden shed and platform to be removed. I Project: 2024-HMP-012 July 2024 Arctos Environmental LLG S- t 1 q� a ,. F �� .. t -'d r k tag `3 a x � a J'1K N � � 7 S k 4 M Ta S yd{= } Site Photo 6:Image showing some of the retaining walls to be modified. 15 Project: 20 4 HMP-12 July 20 2 Arc+o-, EnQronrnen a LLC �« . . �2< »le+o z Image showing some¥tA yellow-flog iris mberemoved. 16 r '�� +''+•o (� "was:. a.r't y 7 r Project:2024-HMP-012 July 2024 Arc-to-, Environmental LLG 4.44 3 la r , A t _ v - a: yam... _ r ^-vim:"--� -.�...,�`'� �s,,•.,,,,.,,,,-w. �.,.,,,�,A,•,,.,,. M.m.� 5 r�a+ur'M6�f'41F!.. Site Photo 9:Image showing the 240ft1 existing dock with solid decking to be modified to incorporate functional grating. 18 Project: $HMP212 July 2 2 Arc+o-, Enaronrnen d LLC 2eRo1E+9ea_.some 4raRg� hivy mWr_«d/_t� shoreline buffer. 19