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HomeMy WebLinkAbout21-102195-Wetland and Buffer Enhancement Program-06-03-2021-V1HABITAT TECHNOLOGIES wetlands, streams, fisheries, wildlife – mitigation and permitting solutions P.O. Box 1088, Puyallup, Washington 98371 253-845-5119 contact@habitattechnologies.net WETLAND AND BUFFER ESTABLISHMENT AND ENHANCEMENT PROGRAM NEW SINGLE-FAMILY HOMESITE – PARCEL 2921049060 South 359th Street City of Federal Way, King County, Washington prepared for Mr. Pavlo Sokalshyy @ Dim Construction Inc. 1210 M Street SE, Suite 33 Auburn, Washington 98002 and Ms. Savanna Nagorski, MS, Land Use Planner @ESM Consulting Engineers, LLC 33400 – 8th Avenue South, #205 Federal Way, Washington 98003 prepared by HABITAT TECHNOLOGIES P.O. Box 1088 Puyallup, Washington 98371-1088 253-845-5119 May 4, 2021 Table of Contents INTRODUCTION .............................................................................................................................. 1 ENVIRONMENTALLY CRITICAL AREAS ASSESSMENT ............................................................ 1 ENVIRONMENTALLY CRITICAL AREAS DETERMINATION ....................................................... 2 REVISED WETLAND BUFFER REQUIREMENTS ...................................................................... 3 SELECTED DEVELOPMENT ACTION ........................................................................................... 3 MODIFICATION OF WETLAND BUFFER STANDARDS ............................................................. 4 MITIGATION SEQUENCING ........................................................................................................ 5 WETLAND AND BUFFER ESTABLISHMENT AND RESTORATION PROGRAM ........................ 7 MITIGATION FOR UNAVOIDABLE IMPACTS ............................................................................. 7 MITIGATION PLANNING ............................................................................................................. 7 MITIGATION PROGRAM BENEFITS ........................................................................................... 8 MITIGATION LIKELIHOOD OF SUCCESS .................................................................................. 8 DESCRIPTION OF THE MITIGATION PROGRAM ...................................................................... 9 GOAL AND OBJECTIVE OF THE ENHANCEMENT PROGRAM .............................................. 10 SELECTED PLANT COMMUNITIES .......................................................................................... 11 IMPLEMENTATION INSPECTION ............................................................................................. 12 IMPLEMENTATION SCHEDULE ............................................................................................... 12 PROJECT MONITORING ........................................................................................................... 13 STANDARDS OF SUCCESS ..................................................................................................... 13 VEGETATION MAINTENANCE PLAN ....................................................................................... 14 REMOVAL OF INVASIVE NON-NATIVE VEGETATION............................................................ 15 CONTINGENCY PLAN ............................................................................................................... 15 TEMPORARY IRRIGATION ....................................................................................................... 15 PLANTING NOTES .................................................................................................................... 16 FINANCIAL GUARANTEE .......................................................................................................... 16 STANDARD OF CARE ................................................................................................................... 17 FIGURES ........................................................................................................................................ 18 ATTACHMENT ONE – WETLAND AND BUFFER PLANTING PROGRAM ................................ 19 1 16070 - south INTRODUCTION The document details the Wetland and Buffer Establishment and Enhancement Program to be implemented as a part of the development of a new single-family homesite within Parcel 2921049060 (project site) (Figure 1). The project site was approximately 0.86- acres in size, generally rectangular in shape, and had been regularly managed as a garden and livestock pasture associated with an adjacent homesite for several years. The project site exhibited a gentle slope from the northeast to the southwest and included an excavated pond and associated garden area in the western portion. The project site was located within a residential area that was quickly changing from older homes on moderately sized lots to newer homes infilling vacant lots and the development of higher intensity residential uses. The area immediately to the west of the project site was part of the Hylebos Wetlands Regional Park. Access to the project site was provided via an easement along the eastern boundary that connected to South 359th Street. Directions to Project Site: From SR18 immediately west of Interstate 5 turn south onto SR161 (Enchanted Parkway). Continue south on SR161 to the intersection with South 356th Street. Turn west onto South 356th Street and then immediately turn south onto 16th Avenue South. Continue south of 16th Avenue South to South 359th Street. Turn west onto South 359th Street and continue to project site. ENVIRONMENTALLY CRITICAL AREAS ASSESSMENT An assessment of environmentally critical areas within and immediately adjacent to the project site was completed during June 2016 and between early February through mid- May 2017, and also included the parcel directly to the north (Parcel 2921049091). This assessment was completed following the established criteria and methods as defined within the Corps of Engineers Wetlands Delineation Manual (1987 Manual), the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (2010 Supplement); the Washington State Wetland Rating System (2014 update), the Washington Department of Natural Resources Water Typing, and the City of Federal Way Chapter 19.145. At the time of the 2016/2017 environment assessment both Parcels 2921049060 and 2921049091 were configured lengthwise north to south with Parcel 2921049060 being the western parcels and Parcel 2921049091 being the eastern parcel. However, since the western parcel was identified as almost completely (>80%) dominated by existing wetland the two parcels were re-configured to be lengthwise east to west within a Boundary Line Adjustment (City #18-102925-SU) to allow for potential future homesite development that would not require an unavoidable encroachment into the identified onsite wetland. 2 16070 - south The project site was regularly managed as a garden and livestock pasture associated with an adjacent homesite to the east for several years. Prior onsite actions had also included the prior import and placement of fill particularly along the northern boundary of the project site. The project site exhibited a gentle slope from the northeast to the southwest. The project site has gone through City of Federal Way wetland peer review (City #16-105771-AD) where it was verified that a City of Federal Way Category II Wetland was present onsite (noted as Wetland A) with an associated standard 165-foot buffer and a City of Federal Way Category I Wetland was present offsite to the west (noted as Wetland B) with an associated standard 225-foot buffer. This offsite wetland was associated with the Hylebos Wetlands Regional Park. ENVIRONMENTALLY CRITICAL AREAS DETERMINATION Onsite assessment completed during 2016/2017 – along with previously completed assessments for a variety of adjacent parcels – identified a wetland generally dominating the western portion of the project site. This wetland (Wetland A) had been managed and manipulated by prior land use actions and was generally dominated by a mowed emergent plant community. An addition wetland (Wetland B) was identified offsite to the west and as associated with the Hylebos Wetlands Regional Park and the West Fork of Hylebos Creek. The project site was not identified and has not been documented to provide critical habitats for federally or state listed endangered, threatened, or sensitive species. WETLAND A: This wetland was located along the western boundary of the project site and had been managed/modified by prior land use actions. The majority of this wetland had been managed as pasture associated with a homesite located directly to the east of the project site. A portion of this wetland included an excavated farm pond that exhibited ponding through the growing season and was used by domestic ducks, geese, or chickens. Wetland A remained saturated to the surface into the first part of the growing season. Wetland A was rated pursuant to the Washington State Department of Ecology Wetland Rating System for Western Washington (Hruby, 2014) and identified to exhibit a total functions score of 20 points (6 habitat functions points). Wetland A was verified following City of Federal Way peer review as meeting the City of Federal Way criteria for definition as a Category II Wetland with a 165-foot standard buffer. WETLAND B: This wetland was located offsite immediately to the west of the project site and was associated with the West Fork of Hylebos Creek Corridor. This wetland exhibited a forested plant community and was verified as meeting the criteria for designation as a City of Federal Way Category I Wetland with a 225-foot standard buffer. This wetland and stream corridor was also identified to meet the criteria for designation as a City of Federal Way “Fish and wildlife habitat conservation areas” based on the following: 3 16070 - south  The West Fork of Hylebos Creek Corridor is associated with the West Fork of Hylebos Creek – a Type F Water (fish bearing) stream.  The West Fork of Hylebos Creek Corridor – and in particular the West Fork of Hylebos Creek – provides critical habitats for federally and state listed threatened and sensitive species.  The West Fork of Hylebos Creek Corridor meets the criteria for designation as a “State priority habitat” associated with state priority species.  The West Fork of Hylebos Creek Corridor provides locally important habitats and is utilized by species of local importance. REVISED WETLAND BUFFER REQUIREMENTS In July 2019, the City of Federal Way revised Chapter 19.145 – Environmentally Critical Areas. Within this revisions the standard buffer width requirements for wetlands were modified to be more consistent with Washington Department of Ecology guidance. WETLAND CATEGORY PRE-2019 REVISION STANDARD BUFFER POST-2019 REVISION STANDARD BUFFER A II (6 habitat) 165 feet 150 feet B I (8 habitat) 225 feet 300 feet The application of the post-2019 revision standard buffer for both Wetland A and Wetland B does not reduction the character or extent of the project site that is either covered by Wetland A or associated standard buffers for Wetland A or Wetland B. The project site continued to be overlain by wetland or standard buffer area. SELECTED DEVELOPMENT ACTION The Selected Development Action for Parcel 2921049060 focuses on the development of a new single-family homesite within the eastern portion of the project site consistent with the City of Federal Way Comprehensive Plan and local zoning. As verified though City of Federal Way wetland peer review the entire project site is dominated by a City of Federal Way Category II Wetland and its associated 150-foot buffer (as revised July 2019), along with portions of the 300-foot buffer (as revised July 2019) associated with the City of Federal Way Category I Wetland located directly to the west of the project site. The project site is 37,660 square feet in total size. To avoid encroachment into the identified onsite wetland the selected location of the new single-family homesite shall be within the southeastern corner of the project site and shall limit the total onsite disturbed area to 8,272 square feet (<20% of the entire parcel – both homesite and driveway 4 16070 - south easement). All of this disturbed area is presently defined as part of the standard buffer associated with Wetland A and Wetland B. The remainder of the project site (>80% of the entire parcel) shall be planted with a variety of native trees and shrubs to re-establish a viable onsite wetland and buffer plant community. Since single-family homesite development would require an unavoidable encroachment into the standard buffer for Wetland A project permitting through the City of Federal Way “reasonable use” provisions. As defined in FWRC 19.45.090(2) and application may apply for a modification or waver of the provisions of Chapter 19.145 for proposed projects on existing single-family residential lots using the City’s Process III. The overall objective of the “reasonable use” provisions is to grant the ability to construct a single- family homesite within a defined parcel consistent with the City’s Comprehensive Plan, local zoning, and the character of the neighborhood. MODIFICATION OF WETLAND BUFFER STANDARDS The City of Federal Way has established mechanisms and provisions to allow for a modification or waiver of the wetland buffers standard where the implementation of these standards would deprive an applicant of all reasonable use of the subject property. The applicant may apply for a modification or waiver of these provisions within a single-family residential lot through the City’s Process III (19.145.090(2)). The City of Federal Way may approve a modification or waiver of the buffer requirements on a case-by-case basis based on the following criteria (19.145.090(3)): (a) The application of the provisions of this chapter eliminates all reasonable use of the subject property; Discussion: As noted above, Parcel 2921049060 is completely overlapped with either an onsite City of Federal Way Category II Wetland, the buffer associated with this onsite Category II Wetland, or the buffer associated with an offsite Category I Wetland. The implementation of the wetland and buffer standards without modifications would eliminate all reasonable use of the parcel. (b) No feasible and reasonable on-site alternatives to the proposal are possible, such as changes to site layout and/or reduction of impervious improvements; Discussion: The project team has reviewed a number of onsite homesite development options. However, the selected location for the new homesite within the southeastern corner of the parcel provides that most reasonable location for the new homesite while also minimizing the required encroachment into the identified standard buffer area. This selected location also minimizes the length of the required assess corridor. The front of the 5 16070 - south new homesite would also be directed eastward, away from the identified wetlands and buffers. (c) It is solely the implementation of this chapter, and not other factors, that preclude all reasonable use of the subject property; Discussion: As noted above, the selected location for the new homesite within the southeastern corner of the parcel provides that most reasonable location for the new homesite while also minimizing the required encroachment into the identified standard buffer area. The project site has been managed as pasture associated with an existing single-family homesite offsite to the east for several years. The entire parcel is overlain with an onsite wetland and associated buffers for the onsite and offsite wetlands. There are no other restrictions that would preclude reasonable use of this parcel as a single-family homesite. (d) The applicant has in no way created or exacerbated the condition that forms the limitation on the use of the subject property, nor in any way contributed to such limitation; and Discussion: The applicant is not responsible for the character or configuration of the onsite and offsite wetlands are. The applicant has undertaken the reconfiguration of the project site and the parcel to the south through a Boundary Line Adjustment to avoid the identified onsite wetland and to ensure that both parcels could be used as single-family homesites without wetland encroachments. (e) The waiver or modification will not lead to, create nor significantly increase the risk of injury or death to any person or damage to improvements on or off the subject property. Discussion: As presently identified the requested modification or waiver of the standard buffer requirements for the development of a new single-family homesite would not significantly increase the risk of injury or death to any person or damage to improvements on or off the subject property. The requested waiver or modification of the buffer standards is the minimum necessary to provide the applicant with some reasonable use of the subject property as outlined above. MITIGATION SEQUENCING The City of Federal Way has identified that a proposed applicant shall demonstrate that all reasonable efforts have been examined with the intent to avoid and minimize impacts 6 16070 - south to critical areas. When alteration to a critical area is proposed, such alteration shall be avoided, minimized, or compensated in the following order of preference (19.145.130): 1. Avoiding the impact altogether by not taking a certain action or parts of an action; Discussion: The proposed project focuses on the development of a new single- family homesite within the southeastern corner of the parcel. The homesite location shall avoid encroachment into the identified onsite wetland. However, since the entire parcel is overlain by an onsite wetland and wetland buffers associated with both onsite and offsite wetlands the encroachment into the standard buffer area is unavoidable. 2. Minimizing impacts by limiting the degree or magnitude of the action and its implementation, by using appropriate technology, or by taking affirmative steps, such as project redesign, relocation, or timing, to avoid or reduce impacts; Discussion: As noted above, present planning would require the unavoidable encroachment into the standard buffer associated with the onsite and offsite wetlands. The project team has reviewed alternatives which may reduce the potential impacts to this wetland through project redesign. However, the present location and character of the onsite and offsite wetlands coupled with the extent of the associated buffers requires an unavoidable encroachment into the buffer. The extent of the unavoidable encroachment has been minimized through the selected location of the new homesite and the minimized size of the development envelope (area of disturbance). Potential impacts have also been minimized through the use of an assess driveway to be located along the eastern boundary of the parcel. 3. Rectifying the impact by repairing, rehabilitating, or restoring the affected environment; Discussion: The project site has been managed as pasture associated with the existing homesite offsite to the east for several years. With the exception of the new homesite envelope the project site would be restored through the planting of native trees and shrubs common to the local area and selected to provide wildlife habitats and water quality protections. 4. Reducing or eliminating the impact over time by preservation and maintenance operations; Discussion: The identified onsite and offsite wetlands would not be adversely impacted by homesite development and the retained onsite wetland and buffer would be restored through the planting of native trees and shrubs common to the local area and selected to provide wildlife habitats and water quality protections. 7 16070 - south 5. Compensating for the impact by replacing, enhancing, or providing substitute resources or environments; and Discussion: The identified onsite and offsite wetlands would not be adversely impacted by homesite development and the retained onsite wetland and buffer would be restored through the planting of native trees and shrubs common to the local area and selected to provide wildlife habitats and water quality protections. 6. Monitoring the impact and the compensation project and taking appropriate corrective measures. Discussion: Following the implementation of the Wetland and Buffer Establishment and Restoration Program as outlined below, a five-year monitoring and maintenance shall be implemented to ensure the success of the program as measured by a set of performance criteria generally associated with plant survival and plant community coverage. WETLAND AND BUFFER ESTABLISHMENT AND RESTORATION PROGRAM MITIGATION FOR UNAVOIDABLE IMPACTS The proposed development of a new single-family homesite within Parcel 2921049060 shall avoid an adverse encroachment into the identified onsite or offsite wetlands. However, the homesite development would require an unavoidable encroachment into the identified onsite buffer area. As compensation for this unavoidable encroachment the retained onsite wetland and buffer would be restored through the planting of native trees and shrubs common to the local area and selected to provide wildlife habitats and water quality protections. MITIGATION PLANNING To ensure that unavoidable buffer encroachment does not result in adverse environmental impacts the project team reviewed a range of permittee sponsored compensatory mitigation alternatives. The mitigation plan outlined below has been prepared consistent with the provisions of the Wetland Mitigation in Washington State Part 1: Agency Policies and Guidance (WDOE 2006), and Wetland Mitigation in Washington State Part 2: Developing Mitigation Plans (WDOE 2006). Both of these documents are defined as “best available science” for the review and development of compensatory mitigation associated with project related impacts to wetlands. The 8 16070 - south mitigation plan also incorporates the Standards outlined in the City of Federal Way Chapter 19.145. The staff of Habitat Technologies has a wide range of professional experience and hands-on creation of compensatory mitigation program planning, mitigation program implementation, mitigation program monitoring, and mitigation program permitting over the past several decades within Washington, Oregon, and Idaho. Habitat Technologies has also been involved with the development of compensatory mitigation program design and implementation requirements at the resource agency level (federal, state, local, tribal) and has provided a wide range of professional peer review of environmental planning and mitigation implementation documents. MITIGATION PROGRAM BENEFITS The overall goal of the Wetland and Buffer Establishment and Restoration Program is to restore a viable native plant community within the onsite retained wetland and buffer areas. The establishment of the viable native plant community would provide enhanced structural stability; would provide enhanced light, dust, and noise screening to protect onsite and offsite aquatic habitats; would provide enhanced aquatic and terrestrial habitats; would provide enhanced stormwater runoff quality protections; would provide enhanced detrital support for the aquatic/terrestrial food-web; and would provide enhanced protection from potential human encroachments. The identified onsite critical areas (wetland and buffer) would also be placed within protective tracts or defined by protective easements for long-term protection. MITIGATION LIKELIHOOD OF SUCCESS As defined by existing site characteristics and a review of similarly completed mitigation programs, it is the professional opinion of Habitat Technologies that the Wetland and Buffer Establishment and Restoration Program outlined below would provide short-term and long-term protection and restoration of onsite and offsite aquatic resources and has been prepared to be consistent with the Department of Ecology Wetland Mitigation in Washington State – Part 2 Developing Mitigation Plans (WDOE 2006) and the Performance Standards outlined in the Standards outlined in the City of Federal Way Chapter 19.145. (mitigation requirements). This program would establish a viable plant community composed of a variety of native species within an area that had been impacted by prior land use actions. In addition, a set of performance standards and maintenance actions have been defined to ensure the overall success of this Wetland and Buffer Establishment and Restoration Program. 9 16070 - south DESCRIPTION OF THE MITIGATION PROGRAM The selected site development action would not require the placement of fill within the identified onsite or offsite wetland. However, the selected site development action would require an encroachment into the associated buffer in the southeastern corner of the project site. To compensation for the required reduction of the associated buffer following enhancement actions shall be undertaken (Attachment One). 1. The retained onsite wetland and associated retained buffer areas shall be initially cleared of any existing garbage and invasive vegetation. Beneficial native trees and shrubs shall be identified and flagged by the project biologist and shall not be removed. The removal of the invasive shrubs and assorted debris shall not adversely impact the soil profile or offsite aquatic features. In addition, the existing site contours not within the proposed homesite development envelop shall not be modified. 2. The proposed homesite development envelop shall be clearly identified and then protective silt fencing shall be installed along this envelope boundary. 3. The established onsite wetland and buffer areas shall be planted with a variety of native trees and shrubs common to the local area. These activities shall create a plant community that protect and enhance the functions and value of the onsite and offsite wetland, provides wildlife habitats, and protects local water quality. 4. All onsite activities shall be monitored by the project biologist or landscape architect. Final plant placements shall be approved by the project biologist prior to installation. Following the completion of onsite planting activities an Implementation Report shall be prepared and submitted to the City of Federal Way. 5. Upon the City’s acceptance of the Implementation Report a five-year monitoring program shall be undertaken following the successful completion of the initial planting efforts to ensure the success of the Wetland and Buffer Establishment and Restoration Program. A series of financial guarantees would be provided to the City of Federal Way (if required) also be implemented to ensure that the proposed work is completed and is successful. 6. Protective silt fencing and orange construction fencing shall be installed along the outer boundary of the established development envelop. This fencing shall be maintained serviceable throughout the construction of the proposed single-family homesite. 10 16070 - south 7. A protective spilt-rail fence (or other fence approved by the City) shall be placed along the defined outer buffer boundary adjacent to the new homesite. This fence shall be posted with a minimum of five (5) City of Federal Way buffer boundary signs. 8. The established buffer shall be memorialized with a recorded “notice on title” or other protective means. GOAL AND OBJECTIVE OF THE ENHANCEMENT PROGRAM The GOAL of the Wetland and Buffer Establishment and Restoration Program is to protect and enhance the functional values of the identified onsite and offsite wetlands. To achieve the defined GOAL, the following OBJECTIVES and PERFORMANCE CRITERIA have been defined: Objective A. The established onsite wetland and buffer areas shall exhibit a scrub/shrub and sapling tree vegetation class within five years following initial planting. Performance Criterion #A1: As defined by plant counts 100% of the trees and shrubs initially planted within the onsite wetland and buffer shall exhibit survival through the end of the first growing season following planting. Performance Criterion #A2: As defined by plant counts 80% of the trees and shrubs initially planted within the onsite wetland and buffer shall exhibit survival through the end of the second and third growing seasons following planting. Performance Criterion #A3: As defined by onsite monitoring within the onsite wetland and buffer areas the scrub/shrub and sapling vegetation class will exhibit the following minimum aerial coverage during the fall monitoring periods during the five years following initial planting. For purposes of the aerial coverage determination the scrub/shrub and sapling vegetation class will include both planted and desirable volunteer species. MONITORING YEAR MINIMUM AERIAL COVERAGE End of monitoring year one 5% End of monitoring year two 10% End of monitoring year three 20% End of monitoring year five 30% Performance Criterion #A4: As defined by aerial coverage, invasive non-native species shall not exceed 10% at the end of the second, third, fourth, and fifth growing seasons following planting. 11 16070 - south Performance Criterion #A5: As defined by onsite monitoring knotweed (Polygonum cuspidatum) shall not be present within the wetland or buffer plant community at the end of the second, third, fourth, and fifth growing seasons following planting. SELECTED PLANT COMMUNITIES The plants selected for the restored onsite wetland and buffer areas shall be obtained as nursery stock. These selected species are native and commonly occur in the local area. The plant species prescribed are selected to increase plant diversity, to match present offsite communities, to increase available wildlife habitats, and to enhance the aquatic environment. NUMBER COMMON NAME (ID) - SCIENTIFIC NAME SIZE 8 Big leaf maple (ACM) - Acer macrophyllum 2 gal 4 Western paper birch (BEP) - Betula papyrifera 2 gal 40 Oregon ash (FRL) - Fraxinus latifolia 2 gal 8 Sitka spruce (PIS) - Picea sitchensis 2 gal 5 Bitter cherry (PRE) - Prunus emarginata 2 gal 24 Douglas fir (PSM) - Pseudotsuga menziesii 2 gal 41 Western crabapple (PYF) - Pyrus fusca 2 gal 32 Western red cedar (THP) - Thuja plicata 2 gal 162 TOTAL TREES 8 Vine maple (ACC) - Acer circinatum 1 gal 25 Tall Oregon grape (BEA) - Berberis aquifolium 1 gal 24 Hazelnut (COC) - Corylus cornuta 1 gal 33 Red osier dogwood (COS) - Cornus stolonifera 1 gal 9 Oceanspray (HOD) - Holodiscus discolor 1 gal 33 Black twinberry (LOI) - Lonicera involucrata 1 gal 33 Pacific ninebark (PHC) - Physocarpus capitatus 1 gal 8 Red flowering currant (RIS) - Ribes sanguineum 1 gal 25 Wild rose (ROG) - Rosa gymnocarpa 1 gal 24 Nootka rose (RON) - Rosa nutkana 1 gal 16 Snowberry (SYA) - Symphoricarpus albus 1 gal 24 Evergreen huckleberry (VAO) - Vaccinium ovatum 1 gal 32 Sitka willow (SAS) - Salix sitchensis 1 gal 32 Pacific willow (SAL) - Salix lasiandra 1 gal 326 TOTAL SHRUBS 12 16070 - south IMPLEMENTATION INSPECTION Essential to the success of the Wetland and Buffer Establishment and Restoration Program is the accurate inspection of onsite activities immediately prior to and during the initial phases. These activities include pre-implementation site inspection, onsite inspection and technical direction during invasive vegetation/debris removal and planting activities, and post-planting site inspection and evaluation. The pre-implementation site inspection allows the project team and the project biologist/landscape architect to evaluate and, if necessary, undertake minor adjustments in the onsite implementation steps. These steps include analysis of project site elevation features, project sequencing and timing, unforeseen required minor modifications to the original establishment plan, and the establishment of environmental protections (silt fences, etc.) required during implementation. Onsite technical inspection during implementation and planting activities shall be implemented by the project biologist/landscape architect. The project biologist/landscape architect shall perform implementation oversight and address minor unforeseen implementation difficulties to assure that the intent of the enhancement program is met. Final plant placements shall be approved by the project biologist/landscape architect prior to installation. The project biologist/landscape architect shall be responsible for ensuring that the species and sizes of native plants selected and noted within the final planting plan are utilized during implementation. If selected native species become unavailable, the project biologist/landscape architect shall consult with the City for substitute plant species to assure that the intent of the buffer enhancement program is met. Post- implementation site inspection/ evaluation shall include the preparation of an Implementation Report which shall be submitted to the City. IMPLEMENTATION SCHEDULE PROJECT TASK TASK SCHEDULE Onsite pre-implementation project meeting Completed by Sept. 15, 202x Placement of protective silt fencing, final marking of desirable plants to be retained, and final marking and identification of work area. Completed by Sept. 30, 202x Removal of invasive species and debris. Completed by Oct. 15, 202x Planting of wetland and buffer area. Completed by Nov. 15, 202x Placement of protective fencing and attachment of buffer signs. Completed by Nov. 25, 202x Implementation report to City Completed by Dec. 5, 202x 13 16070 - south 202x represents the year of implementation. Should this implementation schedule not follow the time period noted above the project team shall coordinate a revised schedule with the City. PROJECT MONITORING Following the successful completion of the initial implementation elements Wetland and Buffer Establishment and Restoration Program and the acceptance of the Implementation Report by the City of Federal Way a five-year monitoring and evaluation program shall be undertaken. The purpose of this program is to ensure the success of the selected Wetland and Buffer Establishment and Restoration Program as measured by an established set of performance criteria. This monitoring shall also provide valuable information on the effectiveness of Wetland and Buffer Establishment and Restoration Program procedures. STANDARDS OF SUCCESS A minimum of five (5) - 15-foot radius permanent vegetation sampling plots shall be established within the restored onsite wetland and buffer. Observations and measurements shall be recorded for all plant species in order of dominance based on the relative percent cover for each species within the various vegetation strata. The evaluation of the success of the Wetland and Buffer Establishment and Restoration Program shall be based on the selected survival rates and coverage for trees and shrubs. These defined performance criteria shall be applied at the times of yearly monitoring. An estimated of “percent aerial cover” and the percent survival rate shall be based on combined counts of existing, volunteer plants, and planted species during vegetation monitoring. Sample location shall be shown on the design and the Implementation Report, and shall correspond to identified photopoints. Trees and shrubs shall be visually evaluated to determine the rate of survivorship, health, and vigor of each plant. The categories to be used shall include live, stressed, tip die-back, basal sprouts, not found, apparently dead, and dead. 1. As a part of each monitoring period the project biologist/landscape architect shall count the number of live plants which were planted within the representative sample plots. Plants shall be identified to species and observations of general plant condition (i.e., plant health, amount of new growth) are to be recorded for each plant. 2. As a part of each monitoring period the project biologist/landscape architect shall determine percent coverage of vegetation for emergent species and for the scrub/shrub and sapling tree species within each representative sample plot. 14 16070 - south 3. At identified sample plots the project biologist/landscape architect shall count the number of undesirable invasive plants and estimate the aerial coverage (as if the observer were looking straight down from above) of these invasive plants within each representative sample plot. Undesirable plants include blackberries, Scot’s broom, tansy ragwort, reed canarygrass, and plants listed in the Washington State Noxious Weed List. 4. At identified sample plots the project biologist/landscape architect shall count the number of desirable "volunteer" plants and estimate the aerial coverage of these plants within each representative sample plot. 5. The project biologist/landscape architect shall take photographs that show the entire enhanced buffer area. During the five year monitoring period the photos shall be taken in the same direction and at the same location to provide a series of photos. These photos shall show plant growth, plant species, and plant coverage. 6. Upon the completion of each annual monitoring period the project biologist/landscape architect shall prepare a report defining methods, observations, and results along with the date the observations were completed. Each report shall be provided to the City. MONITORING YEAR PLANT COMMUNITY MONITORING SUBMITTAL OF MONITORING REPORT YEAR-1 On or about April 15, 202x+1 On or about Sept. 15, 202x+1 Report due Oct. 7, 202x+1 YEAR-2 On or about April 15, 202x+2 On or about Sept. 15, 202x+2 Report due Oct. 7, 202x+2 YEAR-3 On or about April 15, 202x+3 On or about Sept. 15, 202x+3 Report due Oct. 7, 202x+3 YEAR-4 On or about Sept. 15, 202x+4 Report due Oct. 7, 202x+4 YEAR-5 On or about Sept. 15, 202x+5 Report due Oct. 7, 202x+5 Year 202x represents the initial year of implementation VEGETATION MAINTENANCE PLAN Maintenance of the onsite wetland and buffer plant communities may be required to assure the long-term health and welfare of the onsite and offsite wetland and buffer environmental functions. Such maintenance shall be identified during the monitoring period and undertaken only following discussion and coordination with the City. The overall objective is to establish undisturbed plant communities that do not require maintenance. Activities may include, but are not limited to, the removal of invasive non- native vegetation and the irrigation of selected areas. Established maintenance activities include the removal of any trash within the onsite wetland and buffer. 15 16070 - south REMOVAL OF INVASIVE NON-NATIVE VEGETATION As a contingency, should the removal of invasive non-native vegetation become necessary, the project proponent shall contact the City to establish and define specific actions to be taken. Resultant contingency plan activities shall be implemented when the ongoing vegetation monitoring program indicates that plants listed in the Washington State Noxious Weed List, blackberries, reed canarygrass, or Scot's broom are becoming dominant in the community or exceed 10% of the aerial coverage of the planting areas. CONTINGENCY PLAN As a contingency, should the Wetland and Buffer Establishment and Restoration Program fail to meet the performance criteria, the project proponent shall undertake the required remedial actions. Where plant survival is the failing component, the project proponent shall replant and ensure the success of this second, supplemental planting which shall be held to the same standard of success as measured by performance criteria and monitoring processes. Where non-native, invasive vegetation exceeds 10% aerial coverage the project proponent shall undertake removal actions. Such removal actions shall be completed using hand tools or pulling the plants by hand to remove the invasive vegetation without disrupting the soil profile. All cut or pulled vegetation shall be removed from the stream corridor area and disposed in an approved location. Herbicides shall only be used following approval by the City. All herbicide application shall be completed by a licensed professional. Should additional remedial actions be required, the project proponent shall meet with the City to establish and define actions to be taken to meet the desired goal of this Wetland and Buffer Establishment and Restoration Program. TEMPORARY IRRIGATION The project proponent shall ensure that a minimum of one (1) inch of water is supplied each week to the buffer area between May 15th and October 15th for a least the first two years following initial planting. The calculated amount of required water shall include both natural rainfall and temporary irrigation. The need for additional years of irrigation shall be determined based on site conditions and overall plant survival. The amount of water supplied to the onsite wetland and buffer areas shall be increased at the direction of the City or if onsite monitoring defines such a need. A temporary irrigation system shall be installed during the initial planting or during the spring of the first monitoring period. The temporary irrigation system shall utilize above ground sprinklers which allow for suitable overlap to ensure that no area is missed. As an alternative, a drip system may be installed that allows for a minimum of two drip outlets 16 16070 - south for each plant. The final selected irrigation system shall be detailed within the Implementation Report following the initial planting of the onsite wetland and buffer areas. PLANTING NOTES All plant materials utilized within the Wetland and Buffer Establishment and Restoration Program shall be native to the Puget Sound Region. The onsite biologist/landscape architect shall inspect plant materials to assure the appropriate plant schedule and plant characteristics are met. The project proponent shall warrant that all plants shall remain alive and healthy for a period of one year following completion of planting activities. The project proponent shall replace all dead and unhealthy plants with plants of the same specifications as directed by the project biologist/landscape architect. FINANCIAL GUARANTEE Financial guarantees shall be provided for this project and shall be defined in two parts. Part One (Implementation Guarantee) shall be associated with the initial onsite compensation elements of the proposed plan. Part Two (Performance Guarantee) shall be associated with the monitoring and reporting elements of the proposed compensation plan. These guarantees shall be held by the City and be equal to 120% of the actual estimated costs for identified activities. This increased percentage shall allow for adequate funds to be available as a contingency should actions be required to meet the goals of these plans. The Implementation Guarantee shall be deemed to be released by the City upon the successful completion of the initial onsite compensation elements and the acceptance by the City. The Performance Guarantee shall be deemed to be released upon meeting the established threshold criteria and acceptance by the City of the required reporting documents. Implementation Guarantee TASK ASSOCIATED COST Silt fencing and installation $ 600.00 Removal of debris and invasive vegetation (5 hrs 4 person crew at $160/hr.) $ 500.00 162 trees and installation ($25.00/each) $ 4,050.00 326 shrubs and installation ($12.50/each) $ 4,075.00 Onsite biologist/landscape architect (16 hours at $150/hr) $ 2,400.00 Installation of a temporary irrigation system $ 1,500.00 Split-rail or alternative protective fence and buffer signs $ 1,700.00 Sample plot establishment and production of Implementation Report (12 hrs at $150/hr). $ 1,800.00 SUB-TOTAL $16,625.00 Required 20% contingency $3,325.00 IMPLEMENTATION GUARANTEE TOTAL $19,950.00 17 16070 - south Performance Guarantee TASK ASSOCIATED COST Year-One onsite monitoring with expenses Two times for plants (8 hrs at $150/hr) Annual report with photos (2 hrs at $150/hr) $ 1,500.00 Year-Two onsite monitoring with expenses Two times for plants (8 hrs at $150/hr) Annual report with photos (2 hrs at $150/hr) $ 1,500.00 Year-Three onsite monitoring with expenses Two times for plants (8 hrs at $150/hr) Annual report with photos (2 hrs at $150/hr) $ 1,500.00 Year-Four onsite monitoring with expenses One time for plants (6 hrs at $170/hr) Annual report with photos (2 hrs at $170/hr) $ 1,360.00 Year-Five onsite monitoring with expenses One time for plants (6 hrs at $170/hr) Annual report with photos (2 hrs at $170/hr) $ 1,360.00 Water for temporary irrigation $ 800.00/year $ 1,600.00 Invasive vegetation management Three times first year (late Feb, late March, mid May) Two times second and third years (mid March, mid May) $ 4,000.00 SUB-TOTAL $12,820.00 Required 20% contingency $ 2,564.00 PERFORMANCE GUARANTEE TOTAL $ 15,384.00 STANDARD OF CARE This document has been completed by Habitat Technologies for use by Mr. Pavlo Sokalshyy. Prior to extensive site planning this document should be reviewed and verified by City of Federal Way. Habitat Technologies has provided professional services that are in accordance with the degree of care and skill generally accepted in the nature of the work accomplished. No other warranties are expressed or implied. Habitat Technologies is not responsible for design costs incurred before this document is approved by the appropriate resource and permitting agencies. Bryan W. Peck Senior Wetland Biologist Thomas D. Deming, SPWS Habitat Technologies 18 16070 - south FIGURES King County, EagleView Technologies, Inc. Date: 5/20/2021 Notes: ±The information included on this map has been compiled by King County staff from a variety of sources and issubject to change without notice. King County makes no representations or warranties, express or implied,as to accuracy, completeness, timeliness, or rights to the use of such information. This document is not intendedfor use as a survey product. King County shall not be liable for any general, special, indirect, incidental, orconsequential damages including, but not limited to, lost revenues or lost profits resulting from the use or misuseof the information contained on this map. Any sale of this map or information on this map is prohibited except bywritten permission of King County. Figure 1 Site Vicinty 19 16070 - south ATTACHMENT ONE – Wetland and Buffer Planting Program PYFFRLSALSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALSALFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLFRLPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYFPYF11,861 SFWETLAND AREATHPPSMACMBEPPISPREPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMPSMTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPTHPBEPBEPBEPACMACMACMACMACMACMACMPISPISPISPISPISPISPISPREPREPREPRE11,934 SF WETLANDBUFFER AREASPLIT RAIL FENCE ANDSIGN, SEE SHEET L2FOR SIGN DETAILKnow what'sbelow.before you dig.CallRX-REFS:CIVILPLOT SCALE:1:1DRAWING SCALES:1:10DRAWING CONTENTSBUFFERENHANCEMENTPLANDRAWING NO.:L11 OF 2WETLAND PLANTING PLAN SOUTHN01010205www.naturebydesigninc.com1320 Alameda Avenue, Suite B, Fircrest, WA 98466253.460.6067AGENCYREVIEWMAY 20, 2021PROJECT NO:2154FILE NAME:2154LSADRAWN BY:JWSCHECKED BY:KLOORIG. SHEET SIZE 22X34 Know what'sbelow.before you dig.CallRX-REFS:CIVILPLOT SCALE:1:1DRAWING SCALES:NTSDRAWING CONTENTSBUFFERENHANCEMENTNOTES & DETAILSDRAWING NO.:L22 OF 2 2 X BALL DIA.NOTES:1. PLANTING BACKFILL:50% EXISTING SOIL, 50% 1/4 MINUSCOMPOST, MIXED THOROUGHLY2. FOR MULCH TYPE SEELANDSCAPE NOTES.3. IF B&B AND BURLAP ISGREEN IN COLOR. REMOVE COMPLETELYBEFORE INSTALLING PLANT.SHRUB PLANTING DETAILNo ScaleWHEN PLANTING ON A STEEP SLOPE,MAINTAIN PLANT IN VERTICALPOSITION WITHIN PLANTING PIT.MAKE A RIM ON DOWNSLOPE SIDE OFPLANT PIT TO RETAIN WATER.MULCH TO DEPTHSPECIFIED IN NOTESFORM CONTINUOUS RIMBACKFILL W/ BACKFILL MIXTURE ASINDICATED IN NOTE IN 9" LAYERS.WATER AND TAMP TO REMOVE AIR POCKETSREMOVE ALL WIRE WRAPAND PLASTIC WRAP.REMOVE BURLAP FROMTOP OF ROOT BALLMULCH & TOPSOIL OR AMENDED BASE,REFER TO LANDSCAPE NOTES FOR DEPTH34"6" FROM BASEOF BRANCHING1.5"12" 2 X BALL DIA.ENSURE PROPER SUBBASEEXISTS; CLEAR ALLCONCRETE AND OTHERDEBRIS FROM PLANTERSPRIOR TO BACKFILLINGAND PLANTINGNOTES:1. PLANTING BACKFILL:50% EXISTING SOIL, 50% 1/4 MINUSCOMPOST, MIXED THOROUGHLY2. FOR MULCH TYPE SEELANDSCAPE NOTES.3. IF B&B AND BURLAP ISGREEN IN COLOR. REMOVE COMPLETELYBEFORE INSTALLING PLANT.DECIDUOUS TREE PLANTING &STAKING DETAILNo ScaleWHEN PLANTING ON STEEP SLOPE,MAINTAIN PLANT IN VERTICALPOSITION WITHIN PLANTING PIT.MAKE A RIM ON DOWNSLOPE SIDE OFPLANT PIT TO RETAIN WATER,DECIDUOUS TREEINTERLOCKING PLASTIC TREE TIESOR AGENCY APPROVED EQUAL(2) 2x2 OR 2" DIA. WOOD STAKESDRIVEN INTO SUBGRADE OR SIM.METHODFORM SAUCER WITHCONTINUOUS RIMTOP SOIL OR AMENDED BASE, REFERTO LANDSCAPE NOTES FOR DEPTHWHEN B&B REMOVE ALLWIRE AND ROLL BURLAPOFF TOP OF ROOTBALLSCARIFY SIDES OF PIT,BACKFILL WITH SOILMIXTURE INDICATED IN THE NOTES IN9" LAYERS. WATER AND TAMP TOREMOVE AIR POCKETS3" MULCHGENERAL LANDSCAPE NOTES1. Contractor is responsible for obtaining all necessary permits from the appropriate agency prior to commencing work. Contractor shallcontact Line Locators (811) a min. of 48 hours prior to any digging or trenching. If there are any discrepancies with existing lines andlandscaping, it is the contractor's responsibility to contact the landscape architect and request a site visit to address the conflicts.Contractor shall comply and conform to any and all local and state codes for work, schedules and any other project relatedrequirements.2. Contractor shall coordinate directly with the landscape architect for all landscape related issues, concerns, inspections and approvals.Contractor shall provide the landscape architect with a written request for a site visit to address any related items.3. Scope of work shall include any and all specified and unspecified but related incidental work to achieve the design indicated on thelandscape plans. All labor, materials, subcontractors, equipment, and related incidental items shall be supplied and installed to achievea complete project, unless directed otherwise by the general contractor or landscape architect.4. Contractor to verify all sub grades are set below required amendments to insure the finished grade will match what is intended by civilor drainage design. All sub grades and finished or final grades shall be graded to drain to the designed drainage system with positivedrainage away from all structures.5. Grade Preparation:a. Slopes used for grass plantings or turf shall be less than 3:1 or 33 percent. Otherwise plantings should not require mechanized mowingequipment.Soil Preparation.a. Where soils are compacted, planting beds should be deep tilled to a depth of at least 12 inches. Soils shall be enhanced through theaddition of the following materials: bark and forestry by-products, organic matter such as composted yard waste, organics and otheramendments as needed through a soils test. Where Pit Planting, see planting detail for planting ring sizes and depths. Scarify theedges of planting pits to encourage root expansion.b. On project sites where topsoil is limited or nonexistent, a minimum depth of 6 (six) inches of sandy loam topsoil should be tilled intothe soil to a depth of 12 inches through all planting areas with compacted soils.c. For all newly planted areas, three cubic yards of composted organic matter per 1,000 square feet of landscape area should beadded to a depth of four inches to the top of the soil and Tilled in.d. Seeded areas shall be fine graded and rolled. New Soil depths in lawn areas shall be 4 Inches.2. Mulching of Newly Planted or Replanted Areas.a. Mulches must be applied to the following depths: a minimum 3 (three) inches over bare soil, and two inches where plant materialswill cover.b. Mulches must include organic materials, such as wood chips and shredded bark.c. Nonporous materials, such as plastic sheeting, shall not be used in any area of the landscape because of down-slope erosion andpotential soil contamination from herbicide washing.d. Mulch should be applied regularly to and maintained in all planting areas to assist soils in retaining moisture, reducing weed growth,and minimizing erosion.7. Contractor shall field layout all plant material and contact the landscape architect for a site visit to approve the layout. Any fieldmodifications shall be done by the landscape architect prior to planting.8. Contractor shall immediately notify the landscape architect of any poor drainage condition in landscape areas. No standing water shallbe permitted in any landscape areas - either on the surface or below the topsoil. The landscape architect shall coordinate the drainagesolution with the general contractor and civil engineer. Once the concerns have been remedied planting shall commence.9. All groundcover to be planted in a triangular spacing formation, equal in all directions to the centers of the groundcovers in distancesindicated in the legend. Contractor shall verify all quantities of groundcovers by area calculations and spacing requirements.10. Landscaping is to be per plan. Plant substitutions due to availability or otherwise will be allowed only with landscape architect, ownerand agency approval. Any substitutions will be with material of similar size, growth characteristics, and quality.11. All trees must be staked as necessary so as to maintain material in a healthy, vigorous growing condition.12. Landscaping shall be installed in a professional workmanlike manner that is consistent and accepted throughout the industry. Alllandscape and irrigation work shall be performed by experienced persons familiar with scope of project.13. All landscape material and labor is to be guaranteed for a period of one full year from the time of completion.14. When planting 'Balled and Burlapped' product, remove all burlap, string & wire from any B&B plant material, cut and remove jutestrings. Gently place in tact Rootbal into planting pit. If rootball breaks or is not solid - the plant is unacceptable and shall be replaced.15.. Street trees shall be high branching with canopy that starts at least 6' above finish grade.16. All plant I.D. tags are to remain on the plant material until final inspection has been completed. Once approved all plant I.D. tags shallbe removed and discarded appropriately.17. Trees shall be cared for in accordance with the American National Standards Institute (ANSI) standard practices for trees, shrubs andother woody plant maintenance (ANSI 300) in order to allow them to reach there mature height and form.18.. Pruning of street trees shall be performed per the ANSI 300 standards so as to maintain the natural form of the tree, encouragevigorous growth to a mature spread and height, and avoid weakening the tree to create a hazard. Street trees shall not be toppedpollarded, or otherwise pruned in a manner contrary to these goals, unless there is no practicable alternative that would preserveessential utility services.19. Plant material selected is drought tolerant or native species. The project proponent shall be responsible for maintaining and wateringall plant material throughout the first growing season and in times of drought. Temporary irrigation shall be provided via TREEGATOR BAGS attached to each tree. A temporary method for watering the planting areas shall consist of minimally a hose bibaccess to the area and drip hoses on a battery operated hose bib timer. For planting warranties from contractor to be ensured,contractor shall be responsible for watering the plant material and keeping the mulch ring weed free for the first growing season aspart of the contract.It is recommended to install the landscaping in the Spring (February - April) or Fall (October - December)when dormant but before hardfreeze.TEMPORARY IRRIGATIONThe project proponent shall ensure that a minimum of one (1) inch of water is supplied each week to the restoration area betweenMay 1 and October 15 for a least the first two years following initial planting. The calculated amount of required water shall include bothnatural rainfall and temporary irrigation.CITY OF TACOMAWETLAND PLANT LEGEND SOUTHTREESSYMBOLQTYDESCRIPTIONSIZE40Fraxinus latifolia Oregon Ash2 Gal. Min.41Pyrus fusca Western Crabapple2 Gal. Min.SHRUBSSYMBOLQTYDESCRIPTIONSIZE33Cornus stolonifera Red Osier Dogwood1 Gal. Min.33Physocarpus capitatus Ninebark1 Gal. Min.32Salix lasandra Pacific Willow1 Gal. Min.32Salix stichensis Sitka Willow1 Gal. Min.33Lonicera involucrata Black Twinberry1 Gal. Min.FRLPYFSALSBUFFER PLANT LEGEND SOUTHTREESSYMBOLQTYDESCRIPTIONSIZE24Pseudotsuga menziesii Douglas Fir2 Gal. Min.32Thuja plicata Western Red Cedar2 Gal. Min.4Betula papyrifera Western Paper Birch2 Gal. Min.8Acer macrophylum Big Leaf Maple2 Gal. Min.8Picea sitchensis Sitka Spruce2 Gal. Min.5Prunus emargenata Bitter Cherry2 Gal. Min.SHRUBSSYMBOLQTYDESCRIPTIONSIZE8Acer circinatum Vine Maple1 Gal. Min.25Mahonia aquifolium Tall Oregon Grape1 Gal. Min.24Corylus cornuta Hazlenut1 Gal. Min.9Holodiscus discolor Ocean Spray1 Gal. Min.25Rosa gymnocarpa Wild Rose1 Gal. Min.24Rosa nutkana Nootka Rose1 Gal. Min.8Ribes sanguineum Flowering Red Currant1 Gal. Min.16Symphoricarpos albus Snowberry1 Gal. Min.24Vaccinium ovatum Evergreen Huckleberry1 Gal. Min.PSMTHPBEPACMPISPREwww.naturebydesigninc.com1320 Alameda Avenue, Suite B, Fircrest, WA 98466253.460.6067AGENCYREVIEWMAY 20, 2021PROJECT NO:2154FILE NAME:2154LSADRAWN BY:JWSCHECKED BY:KLOORIG. SHEET SIZE 22X34