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Home My WebLink About04_Natural Resources Assessment STEVE STREET PARK Natural Resources Assessment Prepared for March 2024 City of Tigard STEVE STREET PARK Natural Resources Assessment 2801 Alaskan Way Suite 200 Seattle, WA 98121 206.789.9658 esassoc.com Atlanta Bend Irvine Los Angeles Mobile Oakland Orlando Palm Beach County Pasadena Pensacola Petaluma Portland Rancho Cucamonga Sacramento San Diego San Francisco San Jose Sarasota Seattle Tampa Thousand Oaks Prepared for March 2024 City of Tigard OUR COMMITMENT TO SUSTAINABILITY | ESA helps a variety of public and private sector clients plan and prepare for climate change and emerging regulations that limit GHG emissions. ESA is a registered assessor with the California Climate Action Registry, a Climate Leader, and founding reporter for the Climate Registry. ESA is also a corporate member of the U.S. Green Building Council and the Business Council on Climate Change (BC3). Internally, ESA has adopted a Sustainability Vision and Policy Statement and a plan to reduce waste and energy within our i Steve Street Park Natural Resources Assessment CONTENTS Natural Resource Assessment for Steve Street Park Page Chapter 1, Introduction ...................................................................................................... 1-1 Chapter 2, Site and Adjacent Property Location and Description ................................. 2-1 Chapter 3, Sensitive Areas and Vegetated Corridors ..................................................... 3-1 3.1 Sensitive Areas .................................................................................................. 3-1 3.2 Vegetated Corridors ........................................................................................... 3-1 3.2.1 Vegetated Corridor Width ...................................................................... 3-1 3.2.2 Vegetated Corridor Plant Communities and Condition .......................... 3-2 3.3 Proposed Activity ............................................................................................... 3-2 Chapter 4, Limitations ....................................................................................................... 4-1 Chapter 5, References ....................................................................................................... 5-1 Appendices A. Figures B. Water Resources Technical Memorandum C. Vegetated Corridor Data Plot Forms D. Site Photographs Figures and Photographs Figure 1 Vicinity Map .................................................................................................A-1 Figure 2 LWI Wetlands...............................................................................................A-2 Figure 3 Soils Map .....................................................................................................A-3 Figure 4 Existing Conditions ......................................................................................A-4 Photograph 1 LWI Mapped Wetland (Right Side) and Adjacent Upland (Left Side) .......... D-1 Photograph 2 Hydric Soil and Saturation within LWI Mapped Wetland ............................. D-2 Photograph 3 Upland Lawn (Foreground) and Wetland (Background, Behind Fence) Facing North ................................................................................... D-3 Photograph 4 Upland Lawn with a Trail Leading North to Steve Street ............................ D-4 Photograph 5 Interior of LWI Mapped Wetland ................................................................. D-5 Photograph 6 Upland Lawn, Looking Southeast ............................................................... D-6 Contents ii Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 Intentionally Blank 1-1 Steve Street Park Natural Resources Assessment CHAPTER 1 Introduction The City of Tigard (City) owns and operates the open space known as Steve Street Park located at 8400 SW Steve Street in Tigard, Washington County, Oregon (Figure 1 in Appendix A). The City is in the process of developing proposals for future park improvements based on neighborhood input. The development of the park will serve a gap area identified by the city’s Parks System. An approved local wetland inventory (LWI) (Fishman 1994) for the city includes an existing significant wetland mapped within the northwest corner of Steve Street Park. Most of the mapped wetland extends offsite to the northwest of Steve Street Park, and a portion of the sensitive area and its associated Vegetated Corridor extend onto the parcel. At the request of the City, Environmental Science Associates (ESA) conducted a natural resources assessment at the park using methods required by Clean Water Services (CWS) (CWS 2024) and defined in the Western Mountains, Valleys, and Coast Regional Supplement to the U.S. Army Corps of Engineers 1987 Wetlands Delineation Manual (USACE 2010). The purpose of the natural resources assessment was to characterize Vegetated Corridors associated with the mapped wetland and update the wetland boundary for current park planning. Site development is regulated by CWS through the provisions of Chapter 3 of its Design and Construction Standards. This Natural Resources Assessment report accompanies a water resources technical delineation memorandum (Appendix B) and is provided to CWS as part of the City’s process of proposing development at the park. This report was prepared to meet the Simplified Site Assessment requirements listed in CWS Design and Construction Standards Chapter 3.13, and it includes the following information: • Project vicinity map with aerial photo and tax lots • Existing conditions figure • Descriptions of the existing site conditions • Descriptions of the sensitive area and vegetated corridor, including plant communities • Description of proposed development • Site photographs • Vegetated corridor sample plot data Chapter 1. Introduction 1-2 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 2-1 Steve Street Park Natural Resources Assessment CHAPTER 2 Site and Adjacent Property Location and Description Steve Street Park (study area) is located at approximately 8400 SW Steve Street in Tigard, Washington County, Oregon (Tax Lot No. 1S136CB04402), positioned at the terminus of Steve Steet and 85th Ave, north of Highway 99 and east of Hall Boulevard (Figure 1). The park property, which totals 1.37 acres, is currently undeveloped with no impervious surfaces or existing formal trails. Most of the park is open lawn, with trees around the margins of the lawn on all sides of the parcel. Offsite and to the south of the parcel is a small stormwater pond, labeled Water Quality Facility #061 by the City. Ash Creek and its associated wetlands are mapped approximately 0.3 miles to the northwest of the parcel (USFWS 2024; ODFW 2024). Though no surface connections from the creek to the parcel were observed during the time of the natural resources assessment site visit. In general, the terrain of the study area slopes down from south to north, with pockets of undulating microtopography, particularly within the western portion of the property. Site elevations range from approximately 185 feet at the northwestern corner of the study area to approximately 206 feet on the southwestern corner of the study area. However, the wetland feature mapped within the northwestern corner of the property is contained within a depression that continues offsite, to the parcels north and west of study area. This feature is located on undeveloped, forested parcels and encompasses approximately 1.71 acres (City of Tigard 2024a). The study area is located within a residential area that is generally well-developed. Land use adjacent to the study area consists of residential development, with mixed commercial uses occurring beyond the margins of the residential zones. Directly south of the neighborhood, the study area is located within State Route 217; beyond the highway, professional commercial development. The park parcel itself is zoned by the City of Tigard as a Parks and Recreation (PR) zone (City of Tigard 2024a). Chapter 2. Site and Adjacent Property Location and Description 2-2 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 3-1 Steve Street Park Natural Resources Assessment CHAPTER 3 Sensitive Areas and Vegetated Corridors 3.1 Sensitive Areas The City of Tigard LWI (Fishman 1994) maps a significant 1.71-acre palustrine forested and emergent wetland located primarily on the parcels directly north and east outside of the study area, with a small portion of the wetland encompassing the northernmost section of the study area. Cove silty clay loam, a hydric soil that is rated as very poorly drained and indicated the presence of wetlands, is also mapped within the northern portion of the study area (Figure 3) (NRCS 2024). ESA visited the site on February 2, 2024, to confirm and/or update the mapped boundary of the wetland. An attached water resources technical delineation memorandum (Appendix B) describes in more detail the methods, precipitation data relevant to when the field delineation was conducted, and results of the field evaluation. The wetland is located within a depression that extends to the north and west of the Steve Street property, behind a chain-link fence that runs around its perimeter. Dominant vegetation within the wetland includes a forested canopy of black cottonwood (Populus balsamifera) and vine maple (Acer circinatum), a shrub layer of Oregon crabapple (Malus fusca) and spiraea (Spiraea douglasii), and groundcover of emergent vegetation including scouring rush (Equisetum hyemale) and reed canarygrass (Phalaris arundinacea). Large canes of Himalayan blackberry (Rubus bifrons also known as Rubus armeniacus) are also dominant within the wetland (Appendix C). According to the LWI report, the hydrology of the wetland is sourced from precipitation and a stream, which is mapped by the LWI as flowing from west to east, just north of the study area. During the site visit, no stream was observed in this area, though this could be a result of dense vegetation obscuring the channel. Though the mapped stream was not observed within or outside the study area, it is assumed based on existing information (ODFW 2024; Fishman 1994; City of Tigard 2024a) that a stream is present and does provide a hydrological source to the wetland present within the study area. Based on vegetation, hydrology, and hydric soil indicators, ESA confirmed that the wetland mapped by the LWI does meet wetland criteria and extends into the study area generally as depicted (Figure 2); however, during the field investigation, the wetland was determined to be slightly larger and extend further south and east (Figure 4). 3.2 Vegetated Corridors 3.2.1 Vegetated Corridor Width CWS Design and Construction Standards Chapter 3.03.1 establishes procedures for determining widths of Vegetated Corridors adjacent to sensitive areas, including streams and wetlands. For Chapter 3. Sensitive Areas and Vegetated Corridors 3-2 non-isolated wetlands with adjacent slopes of less than 25 percent, the Vegetated Corridor extends outward 50 feet from the wetland boundary. The wetland is a non-isolated wetland, due to the stream connections mapped by existing resources. Slopes adjacent to the wetlands are less than 25 percent, as determined through a combination of on-site field observations and reviews of 1-foot topographic contours generated by LiDAR data (OSIP 2024). Therefore, the Vegetated Corridor width for the wetland within and extending beyond study area is 50 feet, which results in both the wetland sensitive area and associated Vegetated Corridor present within northern portion of the study area. 3.2.2 Vegetated Corridor Plant Communities and Condition Site vegetation conditions were observed by ESA staff during the February 2024 site visit. Three representative Vegetation Data Plots were recorded in the Vegetated Corridor during the site visit (Figure 3 and Appendix D). The Vegetated Corridor on the subject property totals approximately 9,104 square feet and consists of two general plant communities that include nonnative grass lawn and mixed deciduous forest with a Himalayan blackberry understory. The nonnative grass lawn vegetation community is represented by VC-3 and consists of mixed nonnative lawn grasses including dominant species common velvet-grass (Holcus lanatus), meadow fescue (Schedonorus pratensis), and reed canarygrass. There is no canopy cover or shrubs in this area because it is the maintained lawn of the park property. This portion of the Vegetated Corridor is characterized as degraded, based on the lack of canopy and nonnative groundcover dominance. The vegetation community present within the northern and southern portions of the Vegetated Corridor consists of deciduous forest of varying ages and is represented by VC-1 and VC-2. These plots had dominant species black cottonwood and ornamental willow (Salix sp.) within the forested canopy, with canopy cover of the tree species within the plots ranging from 5 to 25 percent. Overall canopy cover within these plots was 35 percent (VC-1) and 65 percent (VC-2), though not entirely composed of native species. Though vine maple was present within VC-1, there was not a high cover of shrubs. Within both plots, nonnative species such as English ivy (Hedera helix) and Himalayan blackberry dominated the herbaceous vegetation layer. Based on the lack of native species in both the canopy and herbaceous layers, presence of nonnative groundcover such as English ivy and Himalayan blackberry, and the tree canopy of native species not exceeding 15 percent aerial cover, the portions of the Vegetated Corridor where VC-1 and VC-2 are located are characterized as marginal. 3.3 Proposed Activity The City is currently in the process of completing its final design proposals for the development of the Steve Street Park. Based on community feedback and available funding, potential development of the park includes the installation of a soft-surface trail within the northern portion of the parcel, a paved loop trail around the perimeter of the parcel to increase ADA accessibility, a water quality facility in the northern portion of the parcel, community garden beds, picnic and Chapter 3. Sensitive Areas and Vegetated Corridors 3-3 Steve Street Park Natural Resources Assessment play areas, and at the southern portion of the park, parking and curb cut to allow for garden maintenance access (City of Tigard 2024b). At this phase in the process of completing design options for the development of the park, proposed project developments do not impact Sensitive Areas or Vegetated Corridors. The potential soft-surface trail located within the northern portion of the study area will not increase impervious surfaces within the Vegetated Corridor, and no impacts are currently proposed within the wetland sensitive area. Additionally, the City will likely propose enhancement options of the Vegetated Corridor as mitigation if any impacts are proposed. The area is currently dominated by nonnative species and has a high cover of invasive species, and removal of this vegetation and replanting with native species is a potential option to provide an ecological lift to the area and enhance the Vegetated Corridor to a good condition. CWS requirements for spacing, density, and species, as outlined in CWS Design and Construction Standards Appendix A, Planting Requirements, will be followed (CWS 2024). Chapter 3. Sensitive Areas and Vegetated Corridors 3-4 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 4-1 Steve Street Park Natural Resources Assessment CHAPTER 4 Limitations Within the limitations of schedule, budget, scope of work, and seasonal constraints, we warrant that this investigation was conducted in accordance with generally accepted environmental science practices, including the technical guidelines and criteria in effect at the time this investigation was performed. The results and conclusions of this report represent the authors’ best professional judgment, based on information provided by the project proponent in addition to that obtained during the course of this study. No other warranty, expressed or implied, is made. Chapter 4. Limitations 4-2 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 5-1 Steve Street Park Natural Resources Assessment CHAPTER 5 References City of Tigard 2024a. Mapping Services. Accessed February 2024. https://maps.tigard-or.gov/. City of Tigard. 2024b. Engage Tigard website. Accessed February 2024. https://www.engage.tigard-or.gov/. Clean Water Services (CWS). 2024. Design & Construction Standards (Current): R&O 19-5 as Amended by R&O 19-22, adopted November 12, 2019. Accessed February 2024. https://cleanwaterservices.org/development/dnc/view-the-standards/. Fishman Environmental Services. 1994. City of Tigard Local Wetlands Inventory Wetlands Assessment. Accessed February 2024. https://docs.dsl.state.or.us/PublicReview/0/doc/863241/Electronic.aspx. NRCS (Natural Resources Conservation Service). 2024. Web Soil Survey. Accessed February 2024. http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx. Oregon Department of Fish and Wildlife (ODFW). 2024. The Oregon Conservation Strategy reporting tool (Compass). Accessed February 2024. https://compass.dfw.state.or.us/visualize/. Oregon Statewide Imagery Program (OSIP). 2022. Oregon Open Data Portal. Accessed February 2024. https://data.oregon.gov/. USACE (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). Technical Report ERDC/EL TR-10-3. U.S. Army Engineer research and Development Center, Vicksburg, Mississippi. USFWS (U.S. Fish and Wildlife Service). 2024. National Wetlands Inventory Wetlands Mapper. Accessed February 2024. https://www.fws.gov/program/national-wetlands- inventory/wetlands-mapper. Chapter 5. References 5-2 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 Steve Street Park Natural Resources Assessment Appendix A Figures Steve Street Park Natural Resources Assessment Appendix B Water Resources Technical Memorandum (see CPA submittal package) Steve Street Park Natural Resources Assessment Appendix C Vegetated Corridor Data Plot Forms Vegetated Corridor Sample Plot Form Project: Steve Street Park Date: 2/2/24 Plot Location: 45.440101, -122.763312 Southeast of wetland Plot No.: VC-1 Plant Community: Forested Condition: Marginal Trees Scientific Name Percent Cover Ornamental willow Salix sp. 10 Black cottonwood Populus balsamifera 20 Oregon crabapple Malus fusca 5 Total Cover 35 Shrubs Scientific Name Percent Cover Vine maple Acer circinatum 10 Total Cover 10 Groundcover Scientific Name Percent Cover Soft rush Juncus effusus 10 English Ivy Helix hedera 10 Sword fern Polystichum munitum 10 Himalayan blackberry Rubus bifrons 15 Kentucky bluegrass Poa pratensis 5 Total Cover 55 1Native plant species according to most recent Metro plant list 2Invasive plant species according to CWS Chapter 3 3Naturalized plant species, not listed as native and not listed as invasive *Vegetated Corridor Condition: Good Corridor = Combination of native trees, shrubs and groundcover covering greater than 80% of the community and greater than 50% tree canopy cover. Marginal Corridor = Combination of native trees, shrubs and groundcover covering 50% to 80% of the community and 26% to 50% tree canopy cover. Degraded Corridor = Combination of native trees, shrubs and groundcover covering less than 50% of the community and less than 25% tree canopy cover. CWS Ch 3.14.5 - Methodology for Vegetated Corridor Condition Assessment a) Establish at least one representative sample point per acre per community type. All communities must be sampled. b) At the sample point, visually determine and document the cover of all plant species providing greater than 5 percent cover within the plot boundary. c) Sample Points shall use a 10-foot radius plot for herbs (non-woody vegetation) and a 30-foot radius plot for woody vegetation. Vegetated Corridor Sample Plot Form Project: Steve Street Park Date: 2/2/24 Plot Location: 45.440075, -122.763391 South of wetland Plot No.: VC-2 Plant Community: Forested Condition: Marginal Trees Scientific Name Percent Cover Ornamental willow Salix sp. 35 Sycamore Platanus sp. 15 Black cottonwood Populus balsamifera 15 Total Cover 65 Shrubs Scientific Name Percent Cover Himalayan blackberry Rubus bifrons 20 Total Cover 20 Groundcover Scientific Name Percent Cover English Ivy Hedera helix 50 Total Cover 50 1Native plant species according to most recent Metro plant list 2Invasive plant species according to CWS Chapter 3 3Naturalized plant species, not listed as native and not listed as invasive *Vegetated Corridor Condition: Good Corridor = Combination of native trees, shrubs and groundcover covering greater than 80% of the community and greater than 50% tree canopy cover. Marginal Corridor = Combination of native trees, shrubs and groundcover covering 50% to 80% of the community and 26% to 50% tree canopy cover. Degraded Corridor = Combination of native trees, shrubs and groundcover covering less than 50% of the community and less than 25% tree canopy cover. CWS Ch 3.14.5 - Methodology for Vegetated Corridor Condition Assessment a) Establish at least one representative sample point per acre per community type. All communities must be sampled. b) At the sample point, visually determine and document the cover of all plant species providing greater than 5 percent cover within the plot boundary. c) Sample Points shall use a 10-foot radius plot for herbs (non-woody vegetation) and a 30-foot radius plot for woody vegetation. Vegetated Corridor Sample Plot Form Project: Steve Street Park Date: 2/2/24 Plot Location: 45.440195, -122.763209 North portion of parcel, east of wetland Plot No.: VC-3 Plant Community: Herbaceous Condition: Trees Scientific Name Percent Cover Shrubs Scientific Name Percent Cover Groundcover Scientific Name Percent Cover Holcus lanatus Poa annua Phalaris arundinacea Geranium molle Schedonorus pratensis Total Cover 100 1Native plant species according to most recent Metro plant list 2Invasive plant species according to CWS Chapter 3 3Naturalized plant species, not listed as native and not listed as invasive *Vegetated Corridor Condition: Good Corridor = Combination of native trees, shrubs and groundcover covering greater than 80% of the community and greater than 50% tree canopy cover. Marginal Corridor = Combination of native trees, shrubs and groundcover covering 50% to 80% of the community and 26% to 50% tree canopy cover. Degraded Corridor = Combination of native trees, shrubs and groundcover covering less than 50% of the community and less than 25% tree canopy cover. CWS Ch 3.14.5 - Methodology for Vegetated Corridor Condition Assessment a)Establish at least one representative sample point per acre per community type. All communities must be sampled. b)At the sample point, visually determine and document the cover of all plant species providing greater than 5 percent cover within the plot boundary. c)Sample Points shall use a 10-foot radius plot for herbs (non-woody vegetation) and a 30-foot radius plot for woody vegetation. Steve Street Park Natural Resources Assessment Appendix D Site Photographs Appendix D. Site Photographs D-1 Steve Street Park Natural Resources Assessment Photo by ESA 2024 Photograph 1 LWI Mapped Wetland (Right Side) and Adjacent Upland (Left Side) Appendix D. Site Photographs D-2 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 Photo by ESA 2024 Photograph 2 Hydric Soil and Saturation within LWI Mapped Wetland Appendix D. Site Photographs D-3 Steve Street Park Natural Resources Assessment Photo by ESA 2024 Photograph 3 Upland Lawn (Foreground) and Wetland (Background, Behind Fence) Facing North Appendix D. Site Photographs D-4 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 Photo by ESA 2024 Photograph 4 Upland Lawn with a Trail Leading North to Steve Street Appendix D. Site Photographs D-5 Steve Street Park Natural Resources Assessment Photo by ESA 2024 Photograph 5 Interior of LWI Mapped Wetland Appendix D. Site Photographs D-6 Steve Street Park Natural Resources Assessment ESA / D202001093.07 March 2024 Photo by ESA 2024 Photograph 6 Upland Lawn, Looking Southeast Exhibit D Wetland Delineation Report October 2021 Contact and Authorization Information Applicant Owner Name, Firm and Address: Business phone # Mobile phone # (optional) E-mail: Authorized Legal Agent, Name and Address (if different): Business phone # Mobile phone # (optional) E-mail: I either own the property described below or I have legal authority to allow access to the property. I authorize the Department to access the property for the purpose of confirming the information in the report, after prior notification to the primary contact. Typed/Printed Name: Signature: Date: Special instructions regarding site access: Project Name: Latitude: Longitude: - centroid of site or start & end points of linear project Proposed Use: Tax Map # Tax Lot(s) Tax Map # Project Street Address (or other descriptive location): Tax Lot(s) Township Range Section QQ Wetland Delineation Information Consultant Signature: Primary Contact Check Applicable Boxes Below R-F permit application submitted Mitigation bank site EFSC/ODOE Proj. Mgr: Wetland restoration/enhancement project (not mitigation) Previous delineation/application on parcel If known, previous DSL # Fee payment submitted $575 Resubmittal of rejected report ($100) Request for Reissuance. See eligibility criteria. (no fee) DSL # Expiration date LWI shows wetlands or waters on parcel Wetland ID code For Office Use Only ___________________DSL Reviewer: _______________ Fee Paid Date: _____ / _____ / _____ Date Delineation Received: ___/ ___/ ___ DSL App.# _______________ WETLAND DELINEATION / DETERMINATION REPORT COVER FORM Under 50MB - A single unlocked PDF can be emailed to: wetland.delineation@dsl.oregon.gov. 50MB or larger - A single unlocked PDF can be uploaded to DSL's Box.com website. After upload notify DSL by email at: wetland.delineation@dsl.oregon.gov. OR a hard copy of the unbound report and signed cover form can be mailed to: Oregon Department of State Lands, 775 Summer Street NE, Suite 100, Salem, OR 97301-1279. A complete report and signed report cover form, along with applicable review fee, are required before a report review timeline can be initiated by the Department of State Lands. All applicants will receive an emailed confirmation that includes the report’s unique file number and other information. Ways to submit report: Ways to pay review fee: By credit card on DSL's epayment portal after receiving the unique file number from DSL’s emailed confirmation. By check payable to the Oregon Department of State Lands attached to the unbound mailed hardcopy OR attached to the complete signed cover form if report submitted electronically. Jeff Peck City of Tigard 13125 SW Hall Blvd Tigard, OR 97223 (503) 718-2466 jeffp@tigard-or.gov Sarah Hartung Environmental Science Associates 819 SE Morrison St, STE 310 Portland, OR 97214 (971) 295-5004 shartung@esassoc.com Steve Street Park Neighborhood park development 8400 SW Steve Street Tigard Washington 45.43995235222525 -122.76329931798017 1S136CB 1S136CB04402 01 South 01 West 36 NW, SW Sarah Hartung Environmental Science Associates 819 SE Morrison St, STE 310 Portland, OR 97214 (971) 295-5004 shartung@esassoc.com 1.37 acres 1.7100 C-9 April 15, 2025 Rick Gruen 4/15/25 STEVE STREET PARK Wetland Delineation Report April 2025 Prepared for City of Tigard STEVE STREET PARK Wetland Delineation Report Prepared for April 2025 City of Tigard 819 SE Morrison Street Suite 310 Portland, OR 97214 503.274.2010 esassoc.com Bend Irvine Los Angeles Mobile Oakland Orlando Palm Beach County Pasadena Pensacola Petaluma Portland Rancho Cucamonga Sacramento San Diego San Francisco San Jose Santa Barbara Sarasota Seattle Tampa Thousand Oaks OUR COMMITMENT TO SUSTAINABILITY | ESA helps a variety of public and private sector clients plan and prepare for climate change and emerging regulations that limit GHG emissions. ESA is a registered assessor with the California Climate Action Registry, a Climate Leader, and founding reporter for the Climate Registry. ESA is also a corporate member of the U.S. Green Building Council and the Business Council on Climate Change (BC3). Internally, ESA has adopted a Sustainability Vision and Policy Statement and a plan to reduce waste and energy within our Steve Street Park iii ESA / D202001093.08 Wetland Delineation Report April 2025 CONTENTS Steve Street Park Wetland Delineation Report Page Chapter 1. Introduction .................................................................................................................. 1-1 1.1 Landscape Setting and Land Use .................................................................................. 1-1 1.2 Site Alterations ............................................................................................................... 1-1 Chapter 2. Methods ........................................................................................................................ 2-1 2.1 Review of Technical Information .................................................................................... 2-1 2.2 Precipitation Data and Analysis ..................................................................................... 2-1 2.3 Description of Wetlands ................................................................................................. 2-2 2.4 Deviation from City Mapping Resources ........................................................................ 2-3 2.5 Mapping Method ............................................................................................................ 2-3 Chapter 3. Results and Conclusions ............................................................................................ 3-1 3.1 Disclaimer ...................................................................................................................... 3-1 Appendices A. Figures B. Data Forms C. Ground Level Color Photographs Tables Table 1 Summary of Precipitation for Wets Station Portland, OR ............................................... 2-2 Contents Steve Street Park iv ESA / D202001093.08 Wetland Delineation Report April 2025 Intentionally Blank Steve Street Park 1-1 ESA / D202001093.08 Wetland Delineation Report April 2025 CHAPTER 1 Introduction This report summarizes a field investigation of the boundary of a wetland mapped on Tax Lot #1S136CB04402 (study area), at 8400 SW Steve St in Tigard, Washington County, Oregon. The City of Tigard (City) Local Wetland Inventory (LWI) shows a significant wetland mapped within the northern portion of the study area (Fishman 1994). At the request of the City, Environmental Science Associates (ESA) conducted a field investigation within the study area to delineate wetlands mapped by the LWI and document any other sensitive areas present on the property for park development. The purpose of this report is to describe the results of the wetland investigation according to the Department of State Lands standards for use in local permitting. 1.1 Landscape Setting and Land Use The study area covers about 1.37 acres and consists of unimproved lawn ringed with trees at Steve Street Park located at 8400 SW Steve St, Tigard, Oregon in Section 36, Township 1 South, Range 1 West, of the Willamette Meridian (Figure 1, Appendix A). The City owns and operates Steve Street Park as open space. The study area slopes down from south to north. However, the LWI-mapped wetland, hereinafter referred to as Wetland A, is positioned in a depression that extends offsite to the north and west (Figure 2, Appendix A). Site elevations range from approximately 185 feet above sea level (asl) at the property’s northwestern corner to approximately 206 feet asl on the southwestern corner of the property. Undulating microtopography is throughout the park but concentrated within a portion of the study area located along the western boundary of the parcel. This microtopography indicates a history of minor disturbances throughout the park, such as grading and vegetation maintenance. Ash Creek and associated wetlands are mapped as occurring 0.3 miles north and east of the study area, though no streams were observed during the time of the field investigation. A subsurface connection via culvert or stormwater infrastructure between Ash Creek and Wetland A is likely, based on mapping by the City and other existing resources (ODFW, USFWS, City of Tigard, 2024) The study area is within City limits, and is zoned as a park, with surrounding areas zoned as residential and commercial development. Where Ash Creek and associated wetlands are mapped 0.3 miles to the northeast, the land remains undeveloped. Historic land use consisted of agricultural and residential development. 1.2 Site Alterations Based on historical aerial imagery, the study area appears to have been graded in 2001 as part of the construction of SW 84th Ave and the housing development along SW 84th Ave, abutting the park property to the south. No recent site alterations have occurred (City of Tigard 2024). 1. Introduction Steve Street Park 1-2 ESA / D202001093.08 Wetland Delineation Report April 2025 Intentionally Blank Steve Street Park 2-1 ESA / D202001093.08 Wetland Delineation Report April 2025 CHAPTER 2 Methods On February 2, 2024, ESA biologists Rachelle Tews and David Goltz conducted a wetland delineation in the study area according to routine methods defined in the Western Mountains, Valleys, and Coast Regional Supplement to the U.S. Army Corps of Engineers 1987 Wetlands Delineation Manual (Corps 2010). Five sample plots were established to document vegetation, soils, and hydrology within the study area and refine the previously mapped boundary of Wetland A in the study area, found in the City’s Local Wetland Inventory (LWI) and characterized as significant (Fishman 1994). Refer to Appendix B for wetland determination forms. 2.1 Review of Technical Information ESA reviewed existing literature, maps, precipitation data, and other materials prior to the field investigation. Sources reviewed include the following: • Local Wetland Inventory (Fishman 1994) • National Resource Conservation Service (NRCS), U.S. Department of Agriculture (USDA) Web Soil Survey (WSS) (NRCS 2024a) • WETS precipitation and temperature data for the study area (NRCS 2024b) • U.S. Fish and Wildlife Service (USFWS) National Wetland Inventory (NWI) (USFWS 2024) 2.2 Precipitation Data and Analysis Recorded precipitation was compared to historic data for the nearest WETS station with full precipitation data, (NRCS 2024b) to determine if climate conditions were normal for the days of field investigation and two months prior. Results are described below (Table 1). Precipitation for the 2023 prior water year in the study area vicinity totaled 41.23 inches and was within the normal range (NRCS 2024b). Rainfall for the two weeks preceding field investigations totaled 7.05 inches and was within the normal range. The rainfall recorded for the two months prior to the field survey was above the normal range, with recorded precipitation in January totaling 11.13 inches. Though this high level of precipitation was considered in the field delineation, no modifications were made to the methods due to the precipitation data. 2. Methods Steve Street Park 2-2 ESA / D202001093.08 Wetland Delineation Report April 2025 TABLE 1 SUMMARY OF PRECIPITATION FOR WETS STATION PORTLAND, OR Recorded Precipitation *WETS Within Normal Range? Time Interval Average 30% Chance Less 30% Chance More 2023 Water Year (October 1, 2022–September 30, 2023) 41.23 43.03 37.86 47.58 Yes Three Months Prior to Survey November 2023 5.67 6.59 4.40 7.90 Yes December 2023 9.91 6.42 4.36 7.66 No (above normal) January 2024 11.13 6.05 3.77 7.31 No (above normal) Two Weeks Prior to Field Surveys January 19, 2024–February 2, 2024 7.05 — — — — * WETS averages were calculated using a 30-year time interval (1971–2000) 2.3 Description of Wetlands During the site visit, ESA surveyed the study area and established five data plots: four to document the presence of upland conditions and one to document wetland conditions (Figure 4). DP-1U was established to confirm the presence of upland conditions upslope of Wetland A. DP-2W documented the presence of wetland conditions within Wetland A (Photo 1, Appendix C). DP-3U was in a swale within the western portion study area that had characteristic wetland vegetation such as soft rush (Juncus effusus – OBL) and served to confirm that the area did not meet other wetland criteria. DP-4U and DP-5U were established adjacent to Wetland A to determine the boundary. All data plots were established in areas mapped by NRCS as having cove silty clay loam, a hydric soil (NRCS 2024b). Within DP-4U, which is located adjacent to the boundary of Wetland A, vegetation is dominated by English ivy (Hedera helix – FACU) and Himalayan blackberry (Rubus bifrons – FAC) and meets the dominance test for presence of hydrophytic vegetation. Soils within this plot are silty clay loam colored dark brown (10YR 3/2) with a small amount of reddish brown redoximorphic features concentrated within the soil matrix lower than 12 inches. Soils did not meet any hydric soil indicators and were therefore characterized as upland. No wetland hydrology indicators were observed. DP-1U was located within the unimproved lawn area of the park. Vegetation in this plot is dominated by red fescue (Festuca rubra – FAC), colonial bentgrass (Agrostis capillaris – FAC), and met the dominance test for hydrophytic vegetation. Soils are silt loam colored brown (10YR 3/3) with a small amount of reddish brown relict redoximorphic features concentrated within the soil matrix. Iron deposits and roots were present throughout the soil profile. These soils did not meet any hydric soil indicators and were therefore characterized as upland. No hydrology indicative of wetlands was observed in this area. DP-3U was located within a band of trees of mixed maturity along the western boundary of the study area. This plot was established within a swale with undulating microtopography running from south to north along the western boundary of the park to investigate potential wetland conditions due to the presence of wetland vegetation. Vegetation in this plot is dominated by black cottonwood (Populus 2. Methods Steve Street Park 2-3 ESA / D202001093.08 Wetland Delineation Report April 2025 balsamifera – FAC), vine maple (Acer circinatum – FAC), clustered rose (Rosa pisocarpa – FAC), Himalayan blackberry (Rubus bifrons – FAC), and horsetail (Equisetum hyemale – FACW). The vegetation in this plot meets the dominance test hydrophytic vegetation indicator. Soils are silt loam colored dark brown (10YR 3/2) from a depth of 0-10 inches and silty clay loam colored grayish brown (10YR 4/2) from a depth of 10-14 inches. The second layer has a small amount of redoximorphic features concentrated within the soil matrix but did not meet the minimum layer thickness to meet the hydric soil indicator for depleted matrix. No hydrology indicative of wetlands was observed in the area. DP-5U was established adjacent to the boundary of Wetland A within the unimproved lawn area of the park (Photo 2, Appendix C). Vegetation in this plot is dominated by common velvet grass (Holcus lanatus – FAC), reed canary grass (Phalaris arundinacea – FACW), and meadow false rye grass (Schedonorus pratensis – FACU), meeting the dominance test for presence of hydrophytic vegetation. Soils were silty clay loam and colored grayish brown (10YR 4/2) from a depth of 0-9 inches and 9-20 inches. The second layer had a small amount of redoximorphic features concentrated within the soil matrix but these features were too faint to meet any hydric soil indicators. No hydrology indicative of wetlands was observed in this area. The wetland plot (DP-2W) was established within a depression, approximately 50 feet from the northern boundary of the study area. Within the wetland plot, dominant vegetation consisted of horsetail (Equisetum hyemale – FACW), vine maple (Acer circinatum – FAC), black cottonwood (Populus balsamifera – FAC), Oregon crab apple (Malus fusca – FACW), and Himalayan blackberry (Rubus bifrons – FAC). Soils are silty clay loam and colored dark brown (10YR 3/2) from a depth of 1-5 inches and grayish brown (10YR 4/2) from a depth of 5-16 inches. Within the 5-16 in layer, prominent redoximorphic concentrations were observed, meeting the depleted matrix hydric soil indicator. Hydrology within the depression included surface water 1 inch deep, and a water table present at 10 inches beneath the soil surface. 2.4 Deviation from City Mapping Resources Using the wetland indicators described above and multiple informal test plots used to further to investigate hydrological and soil conditions, ESA delineated and flagged the area that met wetland criteria with pink flagging labeled “Wetland Delineation” and found that the wetland boundary extends further into the parcel than what is mapped by the City’s Local Wetland Inventory. However, the discrepancy is not significant (Figures 2 & 4). 2.5 Mapping Method The sample plots and wetland flag boundaries were recorded in the field using an ArcGIS field maps application on an iPad paired with an Eos Arrow surveyor device capable of sub-meter accuracy. All background layers, including the survey boundary, were georeferenced using North American Datum of 1983 State Plane, Oregon Statewide, FIPS41 (U.S. feet). 2. Methods Steve Street Park 2-4 ESA / D202001093.08 Wetland Delineation Report April 2025 Intentionally Blank Steve Street Park 3-1 ESA / D202001093.08 Wetland Delineation Report April 2025 CHAPTER 3 Results and Conclusions In summary, the wetland extended further south and east into the study area and differed slightly from what is mapped by the Local Wetland Inventory. The majority of Wetland A is located offsite to the west- northwest of the study area. 3.1 Disclaimer This report documents the investigation, best professional judgment, and conclusions of the investigator. It is correct and complete to the best of his knowledge. It should be considered a Preliminary Jurisdictional Determination of wetlands and other waters and used at your own risk until it has been reviewed and approved in writing by DSL in Accordance with OAR 141-090-0005 through OAR 141- 090-0555. 3. Results and Conclusions Steve Street Park 3-2 ESA / D202001093.08 Wetland Delineation Report April 2025 Steve Street Park ESA / D202001093.08 Wetland Delineation Report April 2025 Appendix A Figures "' N i f-__ __ C 0 � SOURCE: Imagery: OSIP June-Sept 2022; Roads: OSM 2023; Tax Lots: Washington County 2023; County Boundaries: BLM 2015 Coordinate System: U.S. State Plane Oregon Statewide Projection: Lambert Conformal Conic Datum: North American 1983 HARN Study Area Parcel Steve Street Park Delineation Figure 1 Vicinity Map Mapping by: Andy Wilson Created on: April 9th, 2025 Steve Street Park ESA / D202001093.08 Wetland Delineation Report April 2025 Appendix B Data Forms Investigator(s): Soil no Soil no P No No No No Dominance Test worksheet: ) Number of Dominant Species 1. That Are OBL, FACW, or FAC: (A) 2. 3. Total Number of Dominant 4. Species Across All Strata: (B) = (Plot size: ) Percent of Dominant Species 1. 2. 3. 4. Total % Cover of: 5.x 1= =x 2= )x 3= 1.x 4= 2.x 5= 3.(A)(B) 4. 5. 6.Hydrophytic Vegetation Indicators: 7.1-Rapid Test For Hydrophytic Vegetation 8.yes 9.yes 10. 11. = ) 1. 2. = % Bare Ground in Herb Stratum Yes No P Undulating Local relief (concave, convex, none):None % (A/B) significantly disturbed? Total Cover Total Cover Total Cover Total Cover Slope (%):0 (If no, explain in Remarks.) Datum:- WGS84 Are climatic / hydrologic conditions on the site typical for this time of year? Hydric Soil Present? Is the Sampled Area naturally problematic?(If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? or HydrologyAre Vegetation VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Remarks: Wetland Hydrology Present? within a Wetland?Yes Are “Normal Circumstances” present?Yes P P no no Are Vegetation no no Noor Hydrology WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site:Tigard Steve Street City/County:Washington County Sampling Date:2/2/2024 Soil Map Unit Name:Cove silty clay loam NWI classification:None Subregion (LRR):LRR A Lat:45.4399925037 -122.763285147Long: Landform (hillslope, terrace, etc.): Rachelle Tews Section, Township, Range:Section 36, Township 1 South, Range 1 West Applicant/Owner: City of Tigard State:Oregon Sampling Point:DP-1U Tree Stratum % Cover Species?Status(Plot size: 30 ft/radius 3 2 30 ft/radius Multiply by: OBL species 0 0 Prevalence Index worksheet: Sapling/Shrub Stratum That Are OBL, FACW, or FAC: 0 Herb Stratum FAC species 110 330 FACW species 0 (Plot size:5 ft/radius Total % Cover of: 75 0 Agrostis capillaris 30 yes FAC UPL species 0 Festuca rubra 70 yes FAC FACU species 0 3-Prevalence Index is ≤3.01 330Geranium molle 10 no NL Column Totals:110 Prevalence Index = B/A =3 2-Dominance Test is >50% data in Remarks or on a separate sheet) (Plot size: 30 be present, unless disturbed or problematic. Present? Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 Yes Yes Yes P P Vegetation 110 5-Wetland Non-Vascular Plants1 6-Problematic Hydrophytic Vegetation1(Explain) Woody Vine Stratum 4-Morphological Adaptations1 (Provide supporting 10 Hydrophytic Rubus bifrons 10 yes FAC 1 Indicators of hydric soil and wetland hydrology must PYes No0 Sampling Point: % 0 -12 95 - - - - - - - 2 cm Muck (A10) Red Parent Material (TF2) Very Shallow Dark Surface (TF12) Other (Explain in Remarks) No Surface Water (A1)Water-Stained Leaves (B9) (MLRA 1, High Water Table (A2)1, 2, 4A, and 4B)2, 4A, and 4B) Saturation (A3)Salt Crust (B11)Drainage Patterns (B10) Water Marks (B1)Aquatic Invertebrates (B13)Dry-Season Water Table (C2) Sediment Deposits (B2)Hydrogen Sulfide Odor (C1)Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2) Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3) Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5) Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7)Other (Explain in Remarks)Frost-Heave Hummocks (D7) No SOIL DP-1U Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth (inches)TextureColor (moist)Color (moist)%Type1 Loc2 Redox Features Matrix Remarks 10YR 3/3 10YR 4/6 5 C M Silt loam 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils3: Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRA 1) Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2) Histosol (A1)Sandy Redox (S5) Histic Epipedon (A2)Stripped Matrix (S6) Restrictive Layer (if present): Type: Depth (inches):Yes Water Table Present?Depth (Inches):no P Iron deposits present, roots throughout profile, some relict redox present at 14 inches Field Observations: Surface Water Present?Depth (Inches):no Secondary Indicators (2 or more required) Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Water-Stained Leaves (B9) (except MLRA Sparsely Vegetated Concave Surface (B8) HYDROLOGY Hydric Soil Present? Remarks: PnoSaturation Present?Depth (Inches):Wetland Hydrology Present?Yes US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Depleted Below Dark Surface (A11)Depleted Matrix (F3) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Depleted Dark Surface (F7) Redox Depressions (F8)Sandy Gleyed Matrix (S4) Sandy Mucky Mineral (S1) Thick Dark Surface (A12) Investigator(s): Soil no Soil no P No P No P No No Dominance Test worksheet: ) Number of Dominant Species 1. That Are OBL, FACW, or FAC: (A) 2. 3. Total Number of Dominant 4. Species Across All Strata: (B) = (Plot size: ) Percent of Dominant Species 1. 2. 3. 4. Total % Cover of: 5.x 1= =x 2= )x 3= 1.x 4= 2.x 5= 3.(A)(B) 4. 5. 6.Hydrophytic Vegetation Indicators: 7.no 1-Rapid Test For Hydrophytic Vegetation 8.yes 9. 10. 11. = ) 1. 2. = % Bare Ground in Herb Stratum 4-Morphological Adaptations1 (Provide supporting 10 Hydrophytic Rubus bifrons 10 yes FAC 1 Indicators of hydric soil and wetland hydrology must Total Cover Vegetation 70 5-Wetland Non-Vascular Plants1 6-Problematic Hydrophytic Vegetation1(Explain) Woody Vine Stratum PYes No Present? Remarks: Bare ground: 30%, moss present US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 data in Remarks or on a separate sheet) (Plot size: 30 be present, unless disturbed or problematic. Total Cover 2-Dominance Test is >50% 3-Prevalence Index is ≤3.01 160Geranium molle 10 no NL Column Totals:70 Prevalence Index = B/A =2.29 100 Total Cover 0 Polystichum munitum 10 no FACU UPL species Equisetum hyemale 50 yes FACW FACU species 10 120 Herb Stratum FAC species 0 0 40 FACW species 60 (Plot size:5 ft/radius Total % Cover of: 30 ft/radius Multiply by: OBL species 0 Prevalence Index worksheet: Sapling/Shrub Stratum Acer circinatum 40 yes FAC That Are OBL, FACW, or FAC: Populus balsamifera 15 yes FAC (Plot size: 30 ft/radius 4 40 4 Malus fusca 10 no FACW Acer circinatum 15 yes FAC Section 36, Township 1 South, Range 1 West Applicant/Owner: City of Tigard State:Oregon Sampling Point:DP-2W Tree Stratum % Cover Species?Status Yes Yes Yes no Noor Hydrology Hydric Soil Present? WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site:Tigard Steve Street City/County:Washington County Sampling Date:2/2/2024 Soil Map Unit Name:Cove silty clay loam NWI classification:Palustrine Subregion (LRR):LRR A Lat:45.4403390244 -122.763422143Long: Landform (hillslope, terrace, etc.): Rachelle Tews Section, Township, Range: SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? or HydrologyAre Vegetation VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Remarks: Wetland Hydrology Present? within a Wetland?Yes Are “Normal Circumstances” present?Yes P no no Are Vegetation no Yes No P Depression Local relief (concave, convex, none):Concave % (A/B) significantly disturbed? Total Cover Slope (%):1 (If no, explain in Remarks.) Datum:- WGS84 Are climatic / hydrologic conditions on the site typical for this time of year? P Is the Sampled Area naturally problematic?(If needed, explain any answers in Remarks.) Sampling Point: % 1 -5 100 5 -16 95 - - - - - - 2 cm Muck (A10) Red Parent Material (TF2) Very Shallow Dark Surface (TF12) Other (Explain in Remarks) X No X Surface Water (A1)Water-Stained Leaves (B9) (MLRA 1, High Water Table (A2)1, 2, 4A, and 4B)2, 4A, and 4B) Saturation (A3)Salt Crust (B11)Drainage Patterns (B10) Water Marks (B1)Aquatic Invertebrates (B13)Dry-Season Water Table (C2) Sediment Deposits (B2)Hydrogen Sulfide Odor (C1)Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2) Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3) Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5) Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7)Other (Explain in Remarks)Frost-Heave Hummocks (D7) No Depleted Below Dark Surface (A11)Depleted Matrix (F3) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Depleted Dark Surface (F7) Redox Depressions (F8)Sandy Gleyed Matrix (S4) Sandy Mucky Mineral (S1) Thick Dark Surface (A12) US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Saturation Present?Depth (Inches):Wetland Hydrology Present?Yes P Water Table Present?Depth (Inches):10yes Gravels present in bottom layer Field Observations: Surface Water Present?Depth (Inches):1yes Secondary Indicators (2 or more required) Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Water-Stained Leaves (B9) (except MLRA Sparsely Vegetated Concave Surface (B8) HYDROLOGY Hydric Soil Present? Remarks: Restrictive Layer (if present): Type: Depth (inches):Yes P Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRA 1) Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2) Histosol (A1)Sandy Redox (S5) Histic Epipedon (A2)Stripped Matrix (S6) 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils3: 10YR 3/2 Silty clay loam 10YR 4/2 10YR 4/6 5 C M Silty clay loam Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth (inches)TextureColor (moist)Color (moist)%Type1 Loc2 Redox Features Matrix Remarks SOIL DP-2W Investigator(s): Soil no Soil no P No No No No Dominance Test worksheet: ) Number of Dominant Species 1. That Are OBL, FACW, or FAC: (A) 2. 3. Total Number of Dominant 4. Species Across All Strata: (B) = (Plot size: ) Percent of Dominant Species 1. 2. 3. 4. Total % Cover of: 5.x 1= =x 2= )x 3= 1.x 4= 2.x 5= 3.(A)(B) 4. 5. 6.Hydrophytic Vegetation Indicators: 7.no 1-Rapid Test For Hydrophytic Vegetation 8.yes 9. 10. 11. = ) 1. 2. = % Bare Ground in Herb Stratum Yes No P Depression Local relief (concave, convex, none):Concave % (A/B) significantly disturbed? Total Cover Slope (%):0 (If no, explain in Remarks.) Datum:- WGS84 Are climatic / hydrologic conditions on the site typical for this time of year? Is the Sampled Area naturally problematic?(If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. or HydrologyAre Vegetation VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Remarks: Wetland Hydrology Present? within a Wetland?Yes Are “Normal Circumstances” present?Yes P no no Are Vegetation no no WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site:Tigard Steve Street City/County:Washington County Sampling Date:2/2/2024 Soil Map Unit Name:Cove silty clay loam NWI classification:None Subregion (LRR):LRR A Lat:45.4398422592 -122.763535642Long: Landform (hillslope, terrace, etc.): Rachelle Tews Section, Township, Range:Section 36, Township 1 South, Range 1 West Applicant/Owner: City of Tigard State:Oregon Sampling Point:DP-3U Tree Stratum % Cover Species?Status Yes Yes Yes P P P Noor Hydrology Hydric Soil Present? Hydrophytic Vegetation Present? (Plot size: 30 ft/radius 5 75 5 Robinia pseudoacacia 10 no FACU Quercus garryana 15 no UPL Acer circinatum 10 yes FAC That Are OBL, FACW, or FAC: Populus balsamifera 50 yes FAC Total % Cover of: 30 ft/radius Multiply by: OBL species Prevalence Index worksheet: yes FAC Sapling/Shrub Stratum Herb Stratum FAC species 35 FACW species (Plot size:5 ft/radius 100 Total Cover Polystichum munitum 10 no FACU UPL species Equisetum hyemale 50 yes FACW FACU species Rosa pisocarpa 10 3-Prevalence Index is ≤3.01 Geranium molle 10 no NL Column Totals: Prevalence Index = B/A = 2-Dominance Test is >50% Present? Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 Vegetation 70 5-Wetland Non-Vascular Plants1 6-Problematic Hydrophytic Vegetation1(Explain) Woody Vine Stratum PYes No20 (Plot size: 30 be present, unless disturbed or problematic. Total Cover 4-Morphological Adaptations1 (Provide supporting 20 Hydrophytic Rubus bifrons 20 yes FAC 1 Indicators of hydric soil and wetland hydrology must Total Cover data in Remarks or on a separate sheet) Sampling Point: % 0 -10 100 10 -14 70 14 -17 100 - - - - - 2 cm Muck (A10) Red Parent Material (TF2) Very Shallow Dark Surface (TF12) Other (Explain in Remarks) No Surface Water (A1)Water-Stained Leaves (B9) (MLRA 1, High Water Table (A2)1, 2, 4A, and 4B)2, 4A, and 4B) Saturation (A3)Salt Crust (B11)Drainage Patterns (B10) Water Marks (B1)Aquatic Invertebrates (B13)Dry-Season Water Table (C2) Sediment Deposits (B2)Hydrogen Sulfide Odor (C1)Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2) Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3) Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5) Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7)Other (Explain in Remarks)Frost-Heave Hummocks (D7) No SOIL DP-3U Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth (inches)TextureColor (moist)Color (moist)%Type1 Loc2 Redox Features Matrix Remarks 10YR 3/2 Silt, Loam 10YR 4/2 10YR 4/2 7.5YR 3/4 30 C M Silty clay loam Silty clay loam 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils3: Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRA 1) Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2) Histosol (A1)Sandy Redox (S5) Histic Epipedon (A2)Stripped Matrix (S6) Restrictive Layer (if present): Type: Depth (inches):Yes Water Table Present?Depth (Inches):no P Does not meet depleted matrix hydric soil indicator, depleted layer with redox begins at 10 inches below soils surface and is only 4 inches thick. Layer with redox needs to be at least 6" thick within 10" of soil surface to meet this indicator. Field Observations: Surface Water Present?Depth (Inches):no Secondary Indicators (2 or more required) Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Water-Stained Leaves (B9) (except MLRA Sparsely Vegetated Concave Surface (B8) HYDROLOGY Hydric Soil Present? Remarks: PnoSaturation Present?Depth (Inches):Wetland Hydrology Present?Yes US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Depleted Below Dark Surface (A11)Depleted Matrix (F3) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Depleted Dark Surface (F7) Redox Depressions (F8)Sandy Gleyed Matrix (S4) Sandy Mucky Mineral (S1) Thick Dark Surface (A12) Investigator(s): Soil no Soil no P No PP PP No Dominance Test worksheet: Hydrophytic Vegetation Indicators: 1 (Provide supporting Hydrophytic Rubus bifrons 1 Indicators of hydric soil and wetland hydrology must Vegetation 1 1(Explain) PYes No Present? 3-Prevalence Index is ≤3.01 Hedera helix Prevalence Index worksheet: Acer circinatum Populus balsamifera WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. VEGETATION – Use scientific names of plants. within a Wetland?Yes Are “Normal Circumstances” present?P P Base of slope Local relief (concave, convex, none):Concave % (A/B) significantly disturbed? Total Cover Slope (%):1 (If no, explain in Remarks.) Datum:- WGS84 Are climatic / hydrologic conditions on the site typical for this time of year? P Is the Sampled Area naturally problematic?(If needed, explain any answers in Remarks.) Sampling Point: % 1 -13 100 13 -16 97 - - - - - - 2 cm Muck (A10) Red Parent Material (TF2) Very Shallow Dark Surface (TF12) Other (Explain in Remarks) No Surface Water (A1)Water-Stained Leaves (B9) (MLRA 1, High Water Table (A2)1, 2, 4A, and 4B)2, 4A, and 4B) Saturation (A3)Salt Crust (B11)Drainage Patterns (B10) Water Marks (B1)Aquatic Invertebrates (B13)Dry-Season Water Table (C2) Sediment Deposits (B2)Hydrogen Sulfide Odor (C1)Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3)Oxidized Rhizospheres along Living Roots (C3)Geomorphic Position (D2) Algal Mat or Crust (B4)Presence of Reduced Iron (C4)Shallow Aquitard (D3) Iron Deposits (B5)Recent Iron Reduction in Tilled Soils (C6)FAC-Neutral Test (D5) Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7)Other (Explain in Remarks)Frost-Heave Hummocks (D7) No Depleted Below Dark Surface (A11)Depleted Matrix (F3) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Depleted Dark Surface (F7) Redox Depressions (F8)Sandy Gleyed Matrix (S4) Sandy Mucky Mineral (S1) Thick Dark Surface (A12) US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: NSaturation Present?Depth (Inches):> 16 Wetland Hydrology Present?Yes Water Table Present?Depth (Inches):> 16N P Gravels present in bottom layer Field Observations: Surface Water Present?Depth (Inches): Secondary Indicators (2 or more required) Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Water-Stained Leaves (B9) (except MLRA Sparsely Vegetated Concave Surface (B8) HYDROLOGY Hydric Soil Present? Remarks: Restrictive Layer (if present): Type: Depth (inches):Yes Black Histic (A3)Loamy Mucky Mineral (F1) (except MLRA 1) Hydrogen Sulfide (A4)Loamy Gleyed Matrix (F2) Histosol (A1)Sandy Redox (S5) Histic Epipedon (A2)Stripped Matrix (S6) 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.)Indicators for Problematic Hydric Soils3: 10YR 3/2 Silty clay loam 10YR 4/2 10YR 4/6 3 C M Silty clay loam Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth (inches)TextureColor (moist)Color (moist)%Type1 Loc2 Redox Features Matrix Remarks SOIL DP-4U N — P Investigator(s): Soil no Soil no No No No No Dominance Test worksheet: ) Number of Dominant Species 1. That Are OBL, FACW, or FAC: (A) 2. 3. Total Number of Dominant 4. Species Across All Strata: (B) = Plot size: ) Percent of Dominant Species 1. 2. 3. 4. 5.x 1= =x 2= )x 3= 1.x 4= 2.x 5= 3.(A) (B) 4. 5. 6.Hydrophytic Vegetation Indicators: 7.no 1-Rapid Test For Hydrophytic Vegetation 8.yes 9.no 10. 11. = ) 1. 2. = % Bare Ground in Herb Stratum Yes No  Undulating Local relief (concave, convex, none): None % (A/B) significantly disturbed? Total Cover Slope (%): 1 (If no, explain in Remarks.) Datum:- WGS84 Are climatic / hydrologic conditions on the site typical for this time of year? Is the Sampled Area naturally problematic?(If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS – Attach site map showing sampling point locations, transects, important features, etc. Hydrophytic Vegetation Present? or HydrologyAre Vegetation VEGETATION – Use scientific names of plants. Absolute Dominant Indicator Remarks: Wetland Hydrology Present? within a Wetland?Yes Are “Normal Circumstances” present? Yes  no no Are Vegetation no no X Noor Hydrology Hydric Soil Present? WETLAND DETERMINATION DATA FORM – Western Mountains, Valleys, and Coast Region Project/Site: Tigard Steve Street City/County: Washington County Sampling Date: 4/9/2025 Soil Map Unit Name: Cove silty clay loam NWI classification:None Subregion (LRR): LRR A Lat: 45.440326 -122.763176Long: Landform (hillslope, terrace, etc.): David Goltz, Sarah Hartung Section, Township, Range: Section 36, Township 1 South, Range 1 West Applicant/Owner: City of Tigard State: Oregon Sampling Point: DP-5U Tree Stratum % Cover Species? Status 0 (Plot size: 30 ft/radius 3 0 2 0 0 0 30 ft/radius Multiply by: 0 OBL species 0 0 0 Prevalence Index worksheet: Sapling/Shrub Stratum 0 That Are OBL, FACW, or FAC: 0 40 Herb Stratum FAC species 40 120 0 FACW species 20 (Plot size: 5 ft/radius 0 Total % Cover of: 66.67 Total Cover Schedonorus pratensis 25 yes FACU 0 Poa annua 15 no FAC UPL species 0 Holcus lanatus 25 yes FAC FACU species 25 0 3-Prevalence Index is ≤3.01 260 Geranium molle 15 no NL Phalaris arundinacea 20 yes FACW Column Totals: 85 Prevalence Index = B/A = 3.06 0 0 0 2-Dominance Test is >50% data in Remarks or on a separate sheet) (Plot size: 30 0 be present, unless disturbed or problematic. Total Cover Present? Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 Yes Yes Yes   Vegetation 100 5-Wetland Non-Vascular Plants1 6-Problematic Hydrophytic Vegetation1(Explain) Woody Vine Stratum 0 4-Morphological Adaptations1 (Provide supporting 0 0 Hydrophytic 0 1 Indicators of hydric soil and wetland hydrology must Yes No0 Total Cover Sampling Point: % 0 - 9 100 9 - 20 97 0 - 0 0 0 - 0 0 0 - 0 0 0 - 0 0 0 - 0 0 - 2 cm Muck (A10) Red Parent Material (TF2) Very Shallow Dark Surface (TF12) Other (Explain in Remarks) No Surface Water (A1)Water-Stained Leaves (B9) (MLRA 1, High Water Table (A2)1, 2, 4A, and 4B) 2, 4A, and 4B) Saturation (A3) Salt Crust (B11)Drainage Patterns (B10) Water Marks (B1) Aquatic Invertebrates (B13) Dry-Season Water Table (C2) Sediment Deposits (B2) Hydrogen Sulfide Odor (C1) Saturation Visible on Aerial Imagery (C9) Drift Deposits (B3) Oxidized Rhizospheres along Living Roots (C3) Geomorphic Position (D2) Algal Mat or Crust (B4) Presence of Reduced Iron (C4) Shallow Aquitard (D3) Iron Deposits (B5) Recent Iron Reduction in Tilled Soils (C6) FAC-Neutral Test (D5) Surface Soil Cracks (B6)Stunted or Stressed Plants (D1) (LRR A)Raised Ant Mounds (D6) (LRR A) Inundation Visible on Aerial Imagery (B7) Other (Explain in Remarks) Frost-Heave Hummocks (D7) No SOIL DP-5U Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth (inches)TextureColor (moist) Color (moist) % Type1 Loc2 Redox Features Matrix Remarks 10YR 4/2 0 Silty clay loam 0 10YR 4/2 10YR 4/3 3 C M Silty clay loam 0 0 0 0 1Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains. 2Location: PL=Pore Lining, M=Matrix. Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3: Black Histic (A3) Loamy Mucky Mineral (F1) (except MLRA 1) Hydrogen Sulfide (A4) Loamy Gleyed Matrix (F2) Histosol (A1) Sandy Redox (S5) Histic Epipedon (A2) Stripped Matrix (S6) Restrictive Layer (if present): Type: Depth (inches):0 Yes Water Table Present? Depth (Inches):0no  Field Observations: Surface Water Present? Depth (Inches): 0no Secondary Indicators (2 or more required) Wetland Hydrology Indicators: Primary Indicators (minimum of one required; check all that apply) Water-Stained Leaves (B9) (except MLRA Sparsel Ve etated Concave Surface B8 HYDROLOGY Hydric Soil Present? Remarks: noSaturation Present? Depth (Inches):0 Wetland Hydrology Present? Yes US Army Corps of Engineers Western Mountains, Valleys, and Coast - Version 2.0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Depleted Below Dark Surface (A11)Depleted Matrix (F3) Redox Dark Surface (F6) 3Indicators of hydrophytic vegetation and wetland hydrology must be present, unless disturbed or problematic. Depleted Dark Surface (F7) Redox Depressions (F8)Sandy Gleyed Matrix (S4) Sandy Mucky Mineral (S1) Thick Dark Surface (A12) Steve Street Park ESA / D202001093.08 Wetland Delineation Report April 2025 Appendix C Ground Level Color Photographs Appendix C. Representative Photographs Steve Street Park C-1 ESA / D202001093.08 Wetland Delineation Report April 2025 Photo 1. Wetland A behind fence with lawn and downed tree in foreground. Photo 2. Wetland A behind a fence adjacent to the end of Steve Street. Additional Site Photographs Steve Street Park ESA Photo by ESA 2024 Photograph 1A LWI Mapped Wetland (Right Side) and Adjacent Upland (Left Side)