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Home My WebLink AboutSHR2024-00013 - HMP Habitat Managment Plan - 9/30/2024 ,r-. 5tf-2. Zo2'4 _ voo i 3 Habitat Management Plan Parcel: 31911-2 2-00070 407 SE Allen Rd Shelton, WA 98584 Mason County Report prepared for: Bryan Dias 411 SE Allen Rd Shelton, WA 98584 Prepared by: Rob Nagel PO Box 2466 Shelton, WA 98584 rob@arctos-environmental.com (360) 229-3118 Arc.tos Environmental LLG Project: 2024-H M P-014 October 2024 Project: 2024-HMP-014 October 2024 Arc-to-, Environmental LLG Table of Contents Overview............................................................................................................1 PropertyDescription...........................................................................................2 Analysis of Potential Impacts..............................................................................3 Mitigation Measures...........................................................................................4 Monitoring..........................................................................................................9 Summary............................................................................................................9 References........................................................................................................10 Appendix: Site Photos.......................................................................................11 List of Figures Figure1: Vicinity Map .........................................................................................2 Figure2: Site Map...............................................................................................7 Project: 2024-HMP-014 October 2024 /krc+os Environmental LLG Habitat Management Plan 31911-22-00070 407 SE Allen 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) and accessory building within the regulated buffer of the shoreline of Little Skookum Inlet. The total development area proposed is ±2,275ft2, consisting of a ±1,775ft2 SFR and a ±500ft2 accessory building. The SFR is proposed approximately 115ft from the Ordinary High-Water Mark (OHWM) of the shoreline at its closest point, and the accessory building is proposed approximately 97ft. Mitigation sequencing has been followed to avoid, minimize, and mitigate impacts to the buffer area. Mitigation measures have been designed to offset the potential impacts of constructing the SFR on the ecological functions and fish and wildlife habitat of the shoreline buffer. Measures include best- management practices for construction, noxious weed removal, and planting a mitigation area of±2,300ft2 with native trees, shrubs, and ferns. The objectives of this report are as follows: • Identify potential impacts of the proposed development on the critical area 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. 1 Project: 2024-HMP-014 October 2024 Arctos Environmental LLG 13 N G Figure 1:Vicinity Map of project Property Description & Project Background The parcel is 1.84 acres in size and located in section 11 of Township 19 North, Range 3 West. The property slopes from the north to the south where Little Skookum Inlet is located at the bottom of the lot. A forested, slope wetland originates on the slope above the subject property and flows south where it meets the access road and is then diverted east down the ditch. The wetland and ditch contained flowing water during a site visit on 8/30/2024. The ditch runs east towards an Np stream, but went dry prior to reaching the stream, with no clear channel making it to the stream. Typical vegetation growing within the wetland portion of the property includes western red cedar (Thuja plicata), skunk cabbage (Lysichiton americanus), horsetail (Equisetum spp.), and western lady fern (Athyrium filix-femina). The upland vegetation on the property immediately adjacent to the wetland, and just south of the road is characterized mostly by Douglas fir (Pseudotsuga menziesii), big-leaf maple (Acer macrophyllum), and beaked hazelnut (Corylus cornuta). The area proposed for constructing the SFR and accessory building were previously cleared and maintained as open grass areas. Three areas exist on the lot which would benefit from habitat improvements. The first area,just south of 2 Project: 2024-HMP-014 October 2024 Arc+os Environmental LLG the existing well and proposed accessory building, is mostly open grass and leads to a primitive trail to the shoreline. The second area, located south of the existing septic tanks, has a healthy understory but lacks any mature trees. The third area is located adjacent to the existing septic system and is currently maintained in grass. 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 potential adverse impacts to ecological functions associated with the construction of the proposed SFR within the stream, wetland, and shoreline buffers. - Loss of fish and wildlife habitat The development footprint of the proposed project within the buffers is an estimated ±2,275ft2 and located in areas on the property currently dominated by grasses. Three mature cedar trees are required to be removed in order to complete this project. - Impervious surfaces Increasing impervious surfaces on a lot can increase the amount of storm water run-off and increase erosion potential. Three mature cedar trees will be removed for this project, but mitigation plantings will improve the remaining buffer's ability to filter sediment and nutrients from runoff from the property. No increased risk of erosion is anticipated as long as 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 rural 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. 3 Project: 2024-HMP-014 October 2024 /arc+os Environmental LLG - Solar input Three mature cedar trees will be removed in order to implement this plan, however 20 trees planted within the mitigation area, closer to the shoreline, will contribute to shading the edge of the shoreline from excessive solar input as they mature, which will have a net benefit on the shoreline's micro-climate. 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 Given that the lot is entirely encumbered by critical area buffers, it is not possible to avoid impact by constructing the project outside of the buffer areas. This plan proposes minimizing the impact to the critical area buffers by keeping the development area modest and constructing the SFR and accessory building, in areas that were already previously cleared and maintained as open grass areas. The three trees required to be removed will be bucked into as long of logs as feasible and retained within the shoreline buffer. - 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. - Clustering of development All activities related to this project will be clustered to the extent possible without impacting more of the buffer areas than necessary. Equipment and materials will be stored outside the buffer area when not immediately necessary for construction activities. 4 Project: 2024-HMP-014 October 2024 Arc-tog Environmental LLG - Noxious weed removal All occurrences of English holly 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. Any holly too large to be pulled up will be cut at the base and treated with an herbicide using a paint brush to reduce potential for drift. - Mitigation area A mitigation area of approximately 2,300ft2 will be planted with native vegetation in three distinct areas of the property according to the planting guidelines below. Mitigation area A will be planted with trees, shrubs, and ground covers. Mitigation area B will be planted with trees only. Mitigation area C will be planted with shrubs and ground covers only. The minimum number of native plants required to be installed in order to satisfy this requirement are as follows: o Trees: 20 o Shrubs: 55 o Ferns/ground covers: 85 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 to achieve the following minimum densities: Trees— 10' on center Shrubs— ±5' on center Ferns/ground covers — ±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 5 Project: 2024-HMP-014 October 2024 /arc+os Environmental LLG groundcovers on ±4ft centers. Mitigation area B will be planted with trees only. Mitigation area C will be planted with shrubs and groundcovers only. 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. If any portion of the mitigation area is deemed unsuitable for planting either due to concerns of plant survivability or installer safety, then alternate mitigation areas must be determined by a qualified biologist. 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) Shrubs: Salal (Gaultheria shollon) Oregon grape (Mahonia aquifolium) Vine maple (Acer circinatum) Evergreen huckleberry (Vaccinium ovatum) Beaked hazelnut (Corylus cornuta) 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 or the property owner. 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. 6 Project: 2024-HMP-014 October 2024 Arctos Environmental LLG Fertilizing Due to the proximity of the mitigation area to the critical areas, 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. Project: 2024-HMP-014 October 2024 Arc+os Environmental 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 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 two 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. After the first two years, a minimum visual plant cover area of 70% must be achieved within the mitigation area, or the area must be replanted to meet the 70% target. 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 potential adverse impacts from the construction of a proposed SFR and accessory building with a total development footprint of±2,275ft2 within the regulated buffers of the shoreline of Little Skookum Inlet, a Type-Np stream, and a category III slope wetland. Mitigation measures have been designed to offset the potential impacts of constructing the project on the ecological functions and fish and wildlife habitat of the buffer areas. Measures include best-management practices for construction, noxious weed removal, and planting a ±2,300ft2 mitigation area with native vegetation in areas of the buffer currently lacking native vegetation in at least one habitat strata. Proper implementation of this plan will result in no- net-loss of ecological function to the buffers from the development proposed by the applicant. Project: 2024-HMP-014 October 2024 Arc+os Environmental LLG References Guard,J. 1995.Wetland Plants of Oregon &Washington. Lone Pine Publishing. 240 pp. Edmonton, Alberta, Canada. 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://wdfw.wa.gov/sites/defa u 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: htt ps://wdfw.wa.gov/sites/default/files/publications/00052/wdfw00052.pdf Project: 2024-HMP-014 October 2024 Arctos Environmental LLG ,'�,2I �t Environmen+ol LLG ` . , s!C _ e. ,:,�z.,•�- �� t.. r...',; 41 �'�' � ;Tyr} «+ 9r"� a�`� •� �- - �.,�. �- • �_ � '� - �_ � '� � .��;`� Environmental Consulting ( Drone Imagery n- T ,. .. ' r �` t ' .Y � _ « - •�+' .�� °:� PO Box 2466 'fOA R :01. y. G Shelton, 1 A (360) 2 931$8 4 ., �; ,.-'�� .': R y<,. t - - '� "-• - � .T, � '"� � www.arctos-environrnentaLcom 47 CD CD 00 CD ry- 00 4 i �r [ T j , T!X` y, C M i 4y Ny i A t , ' ti . ;'\ _ l x" _ a mot. •� 'mod' N Ki UJ ` r• I Q� s - � • . Y+ 7 , r , « 1 t .-«; ,.q" •r '�►"- fir,. 'Y ,. , +� s � �¢x. ,l� R '�'. ii('kf 4 I. -s. � �� - �» - x � ,. .� � ��_.fir...f.�� I ^► Legend ' - s Q 1 - Little Skookum Inlet �r r Map created by Rob Nagel -s- 3 1 -1s� t � �,t 4 �r,. 2 - 150ft Conservancy Shoreline Buffer t " ' ' October 9, 2024 3 - 165ft Conservancy Shoreline Structure Setback h ` it Revison: x , 4 - Unmapped Non-fish bearing, perennial (Np) Stream , 0 5 - 100ft Np Stream Buffer 6 - 115ft Np Stream Structure Setback 7 - Category III Slope Wetland C3 8 - 110ft Wetland Buffer `° 4 ^sir 9 - 125ft Wetland Structure Setback 10 - Proposed SFR (f 1,775ft2) ' V ® 11 - Proposed Accessory Building (t500ft2) 0 20 40 60 80 ft ® 12 - Existing Septic System This is not a survey map. Measurements are approximate and • Existing Well Scale: 1 " = 30' Q Approximate Parcel Boundaries must be field verified. , 4t,r� of ��.�,�' ., -T',?• S'' '.i Y ��w. - .. "� a '�'i f 14 Ike w Ito -r+ t ��. '��< �� I ,� „�f.:, �`�•;:fir 1�`' .o- '►�,�S,• . :1:.•l;,,sJr�.; ''�, i �� ,,��r,' �. • - i.`�,r•. ' ,� iii"' ' �.�/+, r t f . ..- . . . - . . . . , . .- . •. . - . ..- Project: 2024-HMP-014 October 2024 Arcto,5 Environmental LLG .T jj/ K Jar 41 b ' 41 if �t . `,�, r IKII�� ..i` • mil, . Site Photo 2:Image showing the location of the existing well and proposed building area of the proposed 500ft2 accessory building. Project: 1 ' 1 October 2024 ' • • - i i `} w7{ i { a yrl i ,�rtyc riy .�r' '�l � �� ,rlty'.�: et qw�.v. S *�ig�f°��'2,� � f{K- � ..•. 4+Yr XIOU Site r y� �f l PhotoImage showingthebuilding area Itheproposed Project: 1 ' 1 October 2024 • - i 7-11 J.} � . _yam` I� - wa._°`YS�'A�'C?•r -_ «/, Site Photo 4:Image showing a portion of the proposed mitigation area. 1 -��; � y< a.. Project: 21 1 October 2024 • - • Site Photo 5:Image showing the location of the existing septic system and the location of one of the proposed mitigation areas. lJ.. �y ems'.►. ) .`� � F} � ,�Ya.�� r S '7�.1 l