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Home My WebLink AboutHMP - HMP Habitat Managment Plan - 11/10/2020 ?LANNING Habitat Management Plan Parcel# 32232-50-94008 300 E Dalby Rd RECEIV Union, WA 98592 ED Mason County Nov 102020 615 VV. Alder Street Report prepared for: Rick Buechel - President Hood Canal Communications PO Box 249 Union, WA 98592 Prepared by: Rob Nagel 680 E Philura Ln Shelton, WA 98584 arctosaerial@gmail.com (425) 344-9315 (360) 229-3118 ARCTOS ... AIRIA1 Environmental Consultation I Drone Imagery Project: 2020-H M P-204 October 2020 Project: 2020-H M P-204 October 2020 ARMS A t R I A S Table of Contents Overview................................................................................................................1 PropertyDescription..............................................................................................2 Analysis of Potential Impacts.................................................................................3 Mitigation Measures..............................................................................................5 Monitoring .............................................................................................................8 Summary................................................................................................................9 References............................................................................................................12 List of Figures Figure1: Vicinity Map ............................................................................................2 Figure 2: Map depicting stream/wetland buffers..................................................3 Figure3: Site Plan.................................................................................................10 Figure 4: Site Plan with drone imagery................................................................11 i A RCTOS Project: 2020-H M P-204 October 2020 A E R I A L Habitat Management Plan 32232-50-94008 300 E Da I by Rd Union, WA 98592 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 warehouse expansion within the buffer of Big Bend Creek, a Fish-bearing, Type-F stream, and a tributary to the Hood Canal. The Mason County Resource Ordinance requires a 150-foot buffer with an additional 15-foot building setback for fish-bearing streams. A category III wetland is also nearby, but the proposed expansion would be outside the buffer and setback. (see figure 1). The warehouse expansion is proposed 109-feet from the ordinary high-water mark (OHWM) of the stream at its closest point, with ±1,400ft2 within the stream buffer. The proposed site is currently maintained as a gravel lot and is devoid of vegetation. 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 warehouse expansion 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 g p in a net benefit to ecological functions and fish and wildlife habitat within the remaining buffer. 1 II' Project: 2020-HMP-204 October 2020 ARMS 3 .... Figure 1:Vicinity map of project. Property Description The parcel is current) 1.43 acres in size and located in the SW/ of the SW/ of p Y section 33, Township 22 North, Range 3 West. The main office and an existing warehouse of Hood Canal Communications are located on the above-named parcel. The Type-F stream flows adjacent to the parcel to the north. Existing primary and secondary storm-water retention structures are located to the east. The site is characterized by both young and mature western red cedar (Thuja plicata), Douglas-fir (Pseudotsuga menziesii), big-leaf maple (Acer macrophyllum), sword fern (Polystichum munitum), and salal (Goultheria shallon). Invasive species that occur on the site include Himalayan blackberry. 2 Project: 2020-HMP-204 October 2020 ARMS _k `1 ( 1 M t"^ yF Figure 2:Map showing Big Bend Creek,the Category 111 wetland associated with a tributary to Big Bend Creek,and the regulated buffers of both.The yellow polygon is the 150ft buffer for the wetland.The green polygon is the 150ft buffer for the stream.The red polygon is the parcel in question with a proposed Boundary Line Adjustment. 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 warehouse addition within the Type-F 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. Run-off will be directed to an existing storm-water retention structure to trap sediment and slow down run-off waters. 3 A RCTOS Project: 2020-HMP-204 October 2020 AERIAL - Stream bank stabilization Removing of buffer vegetation and increasing storm water run-off can speed erosion of stream banks and make them unstable. This project site is located on an existing gravel lot already controlled for storm water. No vegetation removal is proposed and no risk of erosion is expected. - Loss of wildlife habitat The development footprint of this warehouse addition within the buffer is only ±1,400ft2 and no vegetation will be removed in the construction process since the project site is already a gravel lot. Mitigation measures will actually increase the amount of wildlife habitat and have a net ecological benefit to 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 on a commercial site 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 warehouse expansion is sited on the south side of the stream on an existing gravel lot and no vegetation 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 ARCTOS Project: 2020-HM P-204 October 2020 AERIAL 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 within the buffer to approximately ±1,400ft2. The warehouse expansion will be constructed in an area already devoid of vegetation. - Mitigation area An area in the northwest corner of the parcel totaling ±1,400ft2 will be restored to vegetated buffer per the planting guidelines below. The mitigation area is currently maintained as a gravel lot/parking area. This area will be identified as a Habitat Preservation Area (HPA). Access to this area will be restricted to a single 3-foot wide trail, 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 ARCTOS Project: 2020-HMP-204 October 2020 AERIAL - Removal of invasive species All occurrences of invasive species in the vicinity of the project site and mitigation area will be mechanically removed using hand tools only. - Landscaping with native plant species Any landscaping within the developed area 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. - Directing storm-water runoff to existing storm-water retention structure Warehouse downspouts will direct runoff into an existing storm-water retention structure located adjacent to the proposed project. Silt fencing and strawbales will be used to insure no sediment enters the stream or wetland. Planting Guidelines (per Appendix C of the Mason County Resource Ordinance) Earthwork Machinery earthwork will be restricted to removing existing gravel in order to implement this restoration plan; planting holes for specified vegetation installation will be hand dug. No additional clearing or grading should be required for site restoration. Native Plantings It is recommended that native plantings be installed within 10 foot wide restoration zones in linear strips extending across the site parallel to the edge of the buffer to achieve the following densities: Trees— 10' on center Shrubs — 5' on center Ferns— 4' on center 6 ARCTOS Project: 2020-HMP-204 October 2020 AERIAL The general plan calls for installing single trees, or clusters of three shrubs, on approximate 10-foot centers. Each row will alternate between 5 trees + 3 shrub clusters or 4 trees + 4 shrub clusters starting from the edge closest to the identified critical area proceeding to the edge of the buffer. Specifically for stream ravine replanting, cedar will be the first type of tree installed within the first row at the top of the ravine, and then incrementally changing one cedar tree to a fir through the first six rows, with all fir trees thereafter or to the edge of the buffer whichever comes first. Exact placement of installed materials will be up to the landscape installer, following the basic 10-foot spacing pattern prescribed. Finally, a native ground cover planting or sword fern will be randomly installed throughout the planting row on average four-foot centers. These densities have been selected to provide a moderately dense, structurally diverse plant community within the restoration area. Volunteer native vegetation can be counted towards the target densities of restoration plants. Typical native plant species that may be used with the restoration zone include: Trees: Western red cedar (Thuja plicato) — 2 or 3 gallon Douglas fir (Pseudotsuga menziesii) — 2 or 3 gallon Western hemlock (Tsuga heterophylla) - 2 or 3 gallon Grand fir (Abies grandis) — 2 or 3 gallon Cascara (Rhamnus purshiana) — 2 or 3 gallon Cottonwood (Populus balsamifera) — 2 or 3 gallon Shrubs: nootka rose (Rosa nutkona) — 1 gallon salmonberry (Rubus spectabilis) — 1 gallon salal (Gaultheria shallon) — 1 gallon evergreen huckleberry (Vaccinium ovatum) — 1 gallon twinberry (Lonicera involucrate) — 1 gallon snowberry (Symphorocarpus albus) — 1 gallon elderberry (Sambucus racemosa) — 1 gallon red osier dogwood (Cornus stolonifera) — 1 gallon Ferns: sword fern (Polystichum munitum) — 1 gallon All planting should occur during winter dormancy. The optimum time for planting is from February to March. A RCTOS Project: 2020-HMP-204 October 2020 AERIAL 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 home construction on the property is completed to avoid damage to the plantings from construction activities. All installed vegetation shall be marked with colored flagging to facilitate monitoring inspections. A separate "as-built" plan will be provided by the landscaper if the planting pattern or schedule deviates from that listed within this document. 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 and weeding or watering necessary to ensure plant survival for up to three years after the date of installation. 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. The annual report will also document the planting success of any native species and the success of the retention structure at controlling storm-water runoff. 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. 8 A RCTOS Project: 2020-HMP-204 October 2020 AERIAL Summary This report Identifies potential impacts of the construction of a proposed warehouse expansion, ±1,400ft', within the regulated buffer of a Type-F, fish- bearing stream. The proposed building site, 109 feet from the stream edge at its closest point, is currently devoid of vegetation 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 1,400ft2 of vegetated stream buffer currently maintained as a gravel lot/parking area, for a mitigation ratio of 1:1. 9 0 0 D aG1 • / \ t i O . :_.. ...............----•-----• _ -• ----- --- � -.--I.. \_ ---- e e ---- ---- O ........................................ . m Site Plan o v W M Warehouse BLDG #2 Addition M a n x C o �.w 3 VIO OW C _. zD o Hood Canal Communications o ,DA v► �y CO /V o Parcel# 32232-50-94008 A 3 3 A a NJ 300 E Dalby Rd 3 a 0 Union, WA 98592 P'� C^ x � N 0 A RCTOS Project: 2020-HMP-204 October 2020 AERIAL ,; •�tx ' -ice; �.,t.: ARCTOS AERIAL Environmental Consulting(Drone Imagery PO Box 2466 Shelton,WA 98584 315 g arctosaerial@gmaii.com www.arctosaerial.com ,y ;. ....... Project:2020-WR-204 +,. FIT � 25 o!I_nu�ettrac� - , Mitigation Area •; .. • Existing Lot Line (t1,400ft') t.. --- O ►_.., J 00„ r Category III Wetland O :G �Ca i prry'tb r�d� i -� i _� � Existing i Gravel Lot i a Q O M r6 Q t CO ry) Potential Boundary Lin V O B e M Ad'ustment r C Sat 150 VJ and p r ,*.> � x U 'r.. Ci Existing c- i P, 5,f,tr 6. L ProposedAddition i3000ft=total .e (t1400ft'within buffer) l t P; Existing Warehouse - BLDG#2 (tl400ft2) Date Created:10-09-2020 �V Revisions: 6 _ _ Existing Main Existing K. Offices BLDG Drainfields #1 ing Parking _ ly. ?" Sheet Number. 1.4 S 2.0 Entr Etosting ''•• Entrance sting . r. +s: • - , t , 0 30 60 90 lzoft 11 Scale:1" =30' Project: 2020-H M P-204 October 2020 ARMS AERIAL 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. 12