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Home My WebLink AboutHMP Habitat Managment Plan - 2/28/2021 Habitat Management Plan Parcel# 12216-75-90032 XXX State Route 302 Belfair, WA 98528 RECEIVED Mason County E[) JUN -9 2023 `� �� !�'✓� Alder Street Report prepared for: Deborah Musselman 990 Kazac PI SE Port Orchard WA 98366 Prepared by: Rob Nagel 680 E Philura Ln Shelton, WA 98584 arctosaerial@gmail.com (425) 344-9315 (360) 229-3118 s ;iti l 5 g 3 s Environmental Consultation Drone Imagery Project: 2021-H M P-001 February 2021 i ARCTOS Project: 2021-HMP-001 February 2021 AERIAL Table of Contents Overview................................................................................................................1 PropertyDescription..............................................................................................2 Analysis of Potential Impacts.................................................................................3 MitigationMeasures..............................................................................................5 Monitoring .............................................................................................................9 Summary................................................................................................................9 References............................................................................................................13 List of Figures Figure1: Vicinity Map ............................................................................................2 Figure 2: Map depicting stream buffer on project site ..........................................3 Figure3: Site Plan.................................................................................................10 Figure 4: Site Plan with drone imagery................................................................11 Figure 4: Mitigation Planting Schedule ................................................................12 i ARMS Project: 2021-HMP-001 February 2021 AFRIAL Habitat Management Plan 12216-75-90032 XXX State Route 302 Belfair, WA 98528 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 non-Fish bearing, seasonal (Ns) stream, which is a tributary to Case Inlet. The Mason County Resource Ordinance requires a 75-foot buffer with an additional 15ft building setback for Type Ns streams. (see figure 1). The SFR is proposed 50ft from the ordinary high-water mark (OHWM) of the stream at its closest point, with ±500ftz within the stream buffer. Additionally, a driveway is proposed to cross the stream and buffer with ±2025ft2 of the driveway within the stream buffer. The proposed site is currently dominated primarily by invasive species, mostly Himalayan blackberry, with a few native tree species mixed in. Mitigation measures have been designed to offset the potential impacts of this activity on the ecological functions of the stream buffer. The mitigation ratio proposed is 1:1 for Re-establishment of a portion of the vegetated stream buffer. The objectives of this report are as follows: • Identify potential impacts of the construction of the proposed SFR 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 a net benefit to ecological functions and fish and wildlife habitat within the remaining buffer. 1 ARM Project: 2021-HMP-001 February 2021 AERIAL an 01 4" 1 3 , S d Figure 1:Vicinity mop of project. Property Description The parcel is 1.15 acres in size and located in the SW% of the SE% of section 16, Township 22 North, Range 1 West. The Type-Ns stream runs through the middle of the parcel from the south to the north. The proposed development site is currently characterized primarily by invasive Himalayan blackberry and scotch broom with a few native red alders along the stream channel. The existing access road to the property runs along the western parcel boundary. An approved septic design locates the system on the opposite side of the creek as the access road. 2 Project: 2021-HMP-001 February 2021 A z �a Figure 2:Map showing the seasonal stream and the regulated buffer.The solid yellow lines are the 75ft buffer for the stream. The dashed yellow lines are the 15ft building setback.The red polygon is the parcel in question. Analysis of Potential Impacts Vegetated buffers serve an important role in protecting critical public resources, as well as fish and wildlife habitat from adverse impacts associated with development. Below are the potential adverse impacts to ecological function associated with the construction of this proposed SFR within the Type-Ns 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 waters without a proper storm water management plan. 3 A RCTOS Project: 2021-HMP-001 February 2021 AI I l - Stream bank stabilization Removing of buffer vegetation and increasing storm water run-off can speed erosion of stream banks and make them unstable. No risk of erosion is expected with this project due to mild slopes and construction BMPs listed in the mitigation measures. - Loss of wildlife habitat The development footprint of this SFR, plus the driveway, within the buffer is only ±2,525ft2 and little native vegetation will be removed in the construction process since the project site is currently dominated by invasive species. Mitigation measures will in fact increase the amount of wildlife habitat and have a net ecological benefit to the stream buffer by removing invasive species, re-establishing native species, and increasing species richness and structural diversity of the stream buffer. - 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 common occurrence. Also, no known nesting sites or priority habitats and species have been identified near the project site. - Increased Solar input The proposed SFR is sited on the east side of the stream and few native trees will be removed in the process of construction. Native plantings within the mitigation area will benefit the stream by eventually increasing shade and reducing solar input. 4 1r Project: 2021-HMP-001 February 2021 X AIRIAL Mitigation Measures 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 minimizes the impact to the stream buffer by minimizing the square footage of the proposed structure and driveway within the buffer to approximately ±2,525ft2. The SFR will be constructed as far from the stream as possible but still accommodate the septic system, and in an area currently dominated by invasive species. - Mitigation area An area along the stream totaling ±2,600ft2 will be restored to vegetated buffer per the planting guidelines below. The mitigation area is currently dominated by invasive species. This area will be identified as a Habitat Preservation Area (HPA). Access to this area will be restricted, and it will be marked with signs identifying it as such. - 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 and erosion will be followed, including placing 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 stream buffer. 5 ARMS Project: 2021-HMP-001 February 2021 AERIAL - Removal of invasive species All occurrences of invasive species in the vicinity of the project site and mitigation area will be mechanically removed without the use of herbicides. - Landscaping with native plant species Any landscaping within the developed area of the stream buffer will be limited to native plant species typically found in undisturbed riparian areas. 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 (adapted from Appendix C of the Mason County Resource Ordinance) 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 plantings will be installed within the mitigation area parallel to the edge of the buffer to achieve the following minimum densities: Trees — 10' on center Shrubs — 5' on center Ferns, grasses, and ground-covers —4' on center The plan calls for installing single trees, or clusters of three shrubs, on 10ft centers and single shrubs on 5ft centers. Areas between will be filled in with ferns, grasses, or ground-covers on 4ft centers. Exact placement of installed materials will be up to the landscape installer, following the basic 10-foot spacing pattern described above and using the planting map as a guide. Successful 6 Project: 2021-HMP-001 February 2021 4i'MAL implementation of the planting plan will achieve a structurally and biologically diverse plant community that mimics undisturbed riparian stream buffers. Volunteer native vegetation can be counted towards the target densities of restoration area at the time of monitoring audits. Native plant species appropriate for this area include, but are not limited to the following: Trees: Pacific madrone (Arbutus menziesii) Western red cedar (Thuja plicota) Douglas fir (Pseudotsuga menziesii) Garry oak (Quercus garryana) Western hemlock (Tsugo heterophyllo) Grand fir (Abies grandis) Cascara (Rhamnus purshiana) Cottonwood (Populus balsamifera) Shore pine (Pinus contorta v. contorta) Pacific crabapple (Malus fusca) Serviceberry (Almenlanchier alnifolia) Shrubs: Ocean spray (Holodiscus discolor) Wax myrtle (Myrica californica) Thimbleberry (Rubus parviflorus) Hookers willow (Salix h000keriana) Tall Oregon grape (Mahonia aquifolium) Nootka rose (Rosa nutkana) Salmonberry (Rubus spectabilis) Salal (Gaultheria shallon) Evergreen huckleberry (Vaccinium ovatum) Snowberry (Symphorocarpus albus) Elderberry (Sambucus racemosa) Red osier dogwood (Cornus stolonifera) Ferns, grasses, and ground-covers: Sword fern (Polystichum munitum) RGTQS Project: 2021-HMP-001 February 2021 AERIAA. Bracken fern (Pteridium aquilinum) Tufted hairgrass (Deschampsia cespitosa) Coastal strawberry (Fragario chiloensis) Seashore saltgrass (Distichlis spicata) Coastal lupine (Lupinus littoralis) Silverweed (Potentilla pacifica) Twinberry (Lonicera involucrate) Henderson's checker-mallow (Sidalcea herdersonii) All planting should occur during winter dormancy. The optimum time for planting is from February to March. Installation Installation of the prescribed vegetation will be performed by qualified landscapers familiar with planting of native vegetation in natural settings. Installation will be performed only after construction on the property is completed to avoid damage to the plantings. Fertilizing Artificial fertilizer may be applied to each planting hole in the form of "slow- release" tablets or some other similar material. However, general broadcast fertilization MAY Not be used within the landscape planting area. 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 three years after the date of installation. 8 ARCTOS Project: 2021-HMP-001 February 2021 Xo, AERIAL. Monitoring Following the implementation of the mitigation measures, an annual report will be submitted to the county 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 buffer and mitigation area plantings. The annual report will also document the planting success of native plantings. If plant survival in the mitigation area falls below 90% at anytime in the 3-year monitoring period, the mitigation area will be selectively re-planted to achieve target densities. If any failures of mitigation measures are identified during the annual inspection, corrective actions will be recommended in the report and will be taken to restore them to working order as soon as possible. Summary This report Identifies potential impacts of the construction of a proposed SFR and driveway, ±2,525ft2, within the regulated buffer of a Type-Ns stream. The proposed building site, 50ft from the stream edge at its closest point, is currently dominated by invasive species and provides little benefit to the stream and its buffer. 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 net benefit to the stream and its buffer's ecological functions, structural diversity, and species richness. Mitigation measures include re- establishing approximately 2,600ft2 of vegetated stream buffer currently covered with invasive species, for a mitigation ratio of 1:1. 9 ARCTOS Project:2021-HMP-001 February2021 AERIAL +15'Type-Ns RC S Type-Ns Stream . Stream Buffer Structure Setback 1�'' AERIAL Environmental Consulting(Drone Imagery Proposed Well Po sox 2466 75'Type-Ns Shelton,WA 98584 Mitigation Areas Stream Buffer (425)344-9315 2,600ft2 total Proposed SFR ( } arctosaerial@gmail.com (2,391ft2 total, vrww.arctosaerial.com S00ft2 within buffer) -------- 7�%7J/7777-777 — t---- -- ----- N yhr r Reserve o omCO rn ,n Js Driveway %e ;• d Drainfield N Cu m. •c. ; T pL I r ' ILA lF N Map created by:Rob Nagel February 2Oth,2021 m",•'"' Revison: '- 0 20 40 60 80 ft `, ' ' 10 At Ak AERIAL Project 2021-HMP-001 February2021 AERIAL y +15'Type-Ns ARCTOS Type-Ns Stream Stream Buffer - Structure Setback AERIAL �x Environmental Consulting I Drone Imagery h Proposed Well Po Box 2466 gation Areas 75'Type-Ns Shelton,WA 98584 (2,600ft2 total) Stream Buffer proposed SFR (425)344-9315 (2,391ftz total, arctosaerial@gmail.com www.arctosaerial.com WOW within buffer) 209' N M N Reserve o o 00 rn N Ln 00 �s Driveway Drainfield ry v ++ M .L ILA i! `n "a a� x aU 5� � Xm a N Map created by:Rob Nagel February 20th,2021 Revison: o A N 0 20 40 60 80 ft t I i h 11 Scale: 1" = 30' ARCTOS Project:2021-HMP-001 February 2021 AIRIAL N i 65, Type-Ns Stream 'a IRIALArK%CTO S^ Legend,. ..", Tree or duster of 3 shrubs �_, " Environmental Consulting I Drone Imagery Shrub PO 2466 Fern,grass,or ground cover Mitigation Areas " Shelton,oWA 98584 --Type-Ns Stream (2,600ft2 total) ; 'y (425)344-9315 �]Parcel Boundary -- arcosaerial@gmail.com Mitigation Area ' v www.arctosaerial.com .� � , ---contours 32' "� o ' Ln �: f 00 r 3 M V t/1 � !✓ V i 4- 32 < m x A 74 ---- ,i { tiF � Driveways k £ Map created by:Rob Nagel � a21 February Ot�. uary 2 h 2 e�OR A. � h Revison: NN ' 0 5 10 15 20 ft s Scale:1' = 10' 1z A RCTQS Project: 2021-HMP-001 February 2021 IRI l L References Environmental Laboratory. (1987). "Corps of Engineers Wetlands Delineation Manual,"Technical Report Y-87-1, U.S.Army Engineer Waterways Experiment Station,Vicksburg, Miss. 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 2018. 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. 13 I +15'Type-Ns ARCTOS Type-Ns Stream . Stream Buffer ;' h� ; .... ,:- Structure Setback AERIAL Environmental Consulting I Drone Imagery Proposed Well 1 Po Box 2466 75'Type-Ns Shelton,WA 98584 Miti ation Areas • (2,OOftz total) Stream Buffer proposed SFR , (425)344 9315 r- arctosaerial@gmail.com (2 391ft2 total, www.arctosaerial.com ' 500ft2 within buffer) -- •w1 1 - i ��_- I 209 ;❑ ; ; Reserve 0 0 00 . v7 +1 00 s„ $ Q 75 Driveway / . Drainfield ;', ;I �I ; N N v NX �} x ;' co Map created by: Rob Nagel _ February 20th, 2021 Revison: _ 0 20 40 60 80 ft �1 Scale: 1" = 30'