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APP0044645-Revised Application-8/3/2010US Army Corps Of Enaineers (Portland Dist Several - See application signature page for name and contact info F � F �:� �� N� �2 j ,. 5 . AGENCIES W ILL ASSIGN NUMBERS �/\ S 2�' Corps Action ID Number Oregon Department of State Lands No �-y. �� i SEND ONE SIGNED COPY OF YOUR APPLICATION TO EACH AGENCY US Army Corps of En in� eers: DSL - West of the Cascades: DSL - East of the Cascades: Send DSL Application Fees to: District Engineer State of Oregon State of Oregon State of Oregon ATTN: CENWP-OD-GPPO AND Department of State Lands OR Department of State Lands AND Department of State Lands Box 2946 775 Summer Street, Sui[e 100 1645 NE Forbes Road, Suite l 12 PO Box 4395, Unit 18 Portland, OR 97208-2946 Salem, OR 97301-] 279 Bend, Oregou 97701 Portland, OR 97208-4395 503-808-4373 503-986-5200 541-388-61 ]2 (Attach a copy of the first page of the application) (1) APPLICANT INFORMATION Name and Address Authorized Agent Name and Address rr,��ti �.,P Consultant Contractor Property Owner Name and Address If different from above� Business Phone # Home Phone # Fax # Email Business Phone # Home Phone # Fax # Emai] Business Phone # Home Phone # (503) 681-3658 DulinT@ CleanWaterServices.orq 503-570-0800 503-570-0855 se @ pacifichabitat.com (2) PROJECT LOCATION Street, Road or Other Descriptive Location Legal Description (attach tax lot rncu�*) CWS#6344 North Bethany Trunk - Generally south Townshi Ran e Section Quarter/Quarter of Germantown Road east and west of NW 185'h SW & NE Otrs of SE Qtr of 13; SW & NE Qtrs 1 NOI�h 2 W 2St 13� 18� 24 of SW Qtr and SW & NE �trs ot NE �tr of 18; Avenue, north and south of NW West Union Road NW & SW otrs of NE �trof 24 In or near (City or Town) I County Bethany Wetland/Waterway (pick one) Rock Creek N/A Tax Map # Portions only: 1N213 1N218 1 N 2 24AC Latitude (in DD.DDDD format) Project Begins 122.85901 — Project Ends 122.87444 Tax Lot 1100, 1201, 2100 2102 100, 200, 304 3500, 3700, 3800 Lon�itude (i� DD.DDDD format) Project Begins 45.57826 — Project Ends 45.55667 Directions to the site Take the NW 185th Avenue exit off Highway 26 in Beaverton. Continue north on NW 185 Ave a distance of approximately 2.5 miles (approximately 0.2 miles south of NW Germantown Road). There will be a farm field to your right. The pipeline begins in the field just east of Rock Creek; about 1/3 mile from NW 185� The pipeline continues south and west across agricultural properties on either side of Rock Creek. The pipeline project will end in the southwest portion of Bethany Lake Park located south of West Union Road, west of NW 185th Avenue. ' If applicant is not the property owner, permission to conduct the work must be attached. ' Attach a copy of all tax maps with the project area highlighted. � * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. Clean Water Services Attn: Tracey Dulin 2550 SW Hillsboro Highway Hillsboro, Oregon 97123 Shawn Eisner Pacific Habitat Services 9450 SW Commerce Circle. Suite 180 X Wilsonville, OR 97070 _ ___ _ �ECl�Ii�E� Joint Permit A ��; �n�-a��o Application Form � EpARi�NiENT Oi� STt�TE LANDS Washington River Mile (if known) 1 (3) PROPOSED PROJECT INFORMATION Type: Fill � Excavation (removal) � In-Wat�er Structure � Maintain/Repair an Existing Structure � Briet Descript�on: The project includes a proposed sanitary sewer trunk line that will serve future development in the North Bethany Planning Area (NBPA) north of NW Springville Road. This application is a revision of the original. Fill Riprap � Rock ❑ Gravel ❑ Organics ❑ Sand ❑ Silt ❑ Clay ❑ Other: � Wedands Permanent (cy) Temporary (cy) Total cubic 135 7,644 yards for Impact Area in Acres Dimensions (feet) project 25,552 (including outside 0 L' W' jj� OHW/wetlands) Waters below OHW Permanent (cy) Temporary (cy) Total cubic 39 9(for sand bag coffer dam) yards for Impact Area in Acres Dimensions (feet) project 39 (including outside 0.007 L' 20 W' 12 t0 27 H' �_2 oHW/wetlands) Removal Wetlands Permanent (cy) Temporary (cy) Total cubic 135 7,644 yards for Impact Area in Acxes Dimensions (feet) project 25,552 (including outside � L' W' H� OHW/wetlands) Waters below OHW Permanent (cy) Temporary (cy) Total cubic �� yards for Impact Area in Acres Dimensions (feet) project 34 (including outside 0.��7 L' 2� W' � 2 t0 27 H' �- 2 OHW/wedands) Total acres of construction related ground disturbance (If 1 acre or more a 1200-C permit may be required from DEQ) 13 aCf@S Is the disposal area upland? Yes � No � Impervious surface created? 0<1 acre � 0>1 acre? � Yes No If yes, please Are you aware of any state or federallv listed species on the project site? X explain in the project Are you aware of any Cultural/Historic Resources on the project site? X description Is the project site within a national Wild & Scenic River? X (in block 4) Ls the project site within a State Scenic State Scenic Wnterw�a��?* X 4 PROPOSED PROJECT PURPOSE AND DESCRIPTION Purpose and Need: Provide a description of the public, social, economic, or environmer�tal benefits of the project along with any supporting formal actions of a public body (e.g. city or counry government), as appropriate. * The proposed gravity sewer line and alignment are designed to serve the community of North Bethany. The UGB was expanded to include approximately 800 acres in North Bethany in 2002. Beginning in 2006, a three year planning process has resulted in a conceptual land use plan and code language that will implement the plan. The concept plan envisions that North Bethany will be planned as an extension of the existing Bethany community to the south. The area will be predominantly residential with a mix of parks, open space, schools and neighborhood services supported by a muitimodai transportation system. Preliminary sewer analysis that was conducted for the North Bethany Concept Plan (in 2006) was refined by further analysis in a January 2008 Alternatives Analysis by the project engineer. Without expansion of sewerage service as facilitated by the proposed action, the existing concept plan can not be implemented. * Italicized areas are not required by the Corps for a complete app&cation, but may be necessary prior to final permit decision by the Corps. Descrintion: Please describe in detail the proposed removal and fill activities, including the following information: Volumes and acreages of all fill and removal activities in waterway or wetland separately Permanent and temporary impacts Types of materials (e.g., gravel, silt, clay, etc.) How the project will be accomplished (i.e., describe construction methods, equipment, site access) Describe any changes that the project may make to the hydraulic artd hydrologic characteristics (e.g., general direction of stream and surface water flow, estimated winter and summer flow volumes.) of the waters of the state, and an e.xplanation of ineasures taken to avoid or minimize any adverse effects of those changes. Is any of the work already complete? Yes � No � If yes, please describe the completed work. In addition, for fish habitat or wetland restoration or enhancement activities, complete the information requested in supplemental Fish Habitat or Wetland Restoration and Enhancement form. Pipeline Installation: Installation of the pipeline will primarily utilize open trench excavation, followed by pipe installation and trench backfill. The exception to trenching is for two crossings of Rock Creek and two roadway crossings, where directional bore technology will be used to eliminate the need for excavation in the creek or roadway. The temporary impact area in the wetlands for pipeline installation could be as large as 201,607 square feeU4.63 acres. The ultimate area of impact will depend upon the contractor's utilization of the 55 foot wide temporary construction easement. The approximate limits of potential impacts to wetlands are identified on figures PP1 through 13. The net difference between fill and removal in trenches through the wetlands will be zero. Surplus material will be hauled offsite to a suitable upland disposal site by the contractor. An alteration to the pipeline alignment has reduced the volume of pipe in the wetlands to approximately 125 cubic yards from 144 cubic yards. The volume of imported gravel backfill in the wetlands that will replace native fill has also been reduced to 1,402 cubic yards from 13,285 cubic yards. The manholes and the sanitary sewer pipe are the only permanent structures. The manholes occurring in the wetlands will have a total volume of approximately 135 cubic yards that will replace native material. The permanent area of manholes in the wetlands is approximately 113 square feet (16 manholes in wetlands; assuming a 3 foot outside diameter at the surface). One manhole has been added to ensure the alignment is farther away from the creek. The total volume of material to be removed and replaced (including native backfill) in the wetlands is 7,644 cubic yards. Fill material in the pipe zone (defined as 6 inches below and above the pipe) will be 3 /4' minus crushed rock. Above the pipe zone the trench will be replaced with native fill. The top 12 inches of the trench will be replaced with native topsoil. To limit the potential for draining groundwater along the pipeline, clay plugs will be installed in the trench at intervals of approximately 100 feet where it passes through wetlands. Through utilization of the clay plugs in the trench, and restoration of grades and vegetation at the surface, there will be no anticipated impacts to the hydrologic or hydraulic conditions in any of the wetlands. Due to site constraints, an open trench crossing is necessary across the outlet spillway of Bethany Lake (also referred to as the spillway channel in this application). The spillway channel between the outlet weir of Bethany Lake and Rock Creek will require significant restoration efforts following installation of the proposed 24-inch sewer pipe, relocation of an existing 8-inch irrigation pipe, and removal of a concrete cap over a portion of the irrigation pipe. A detaifed description of this work follows, with additional details on Figures 5A and 5B. Spillwav Channel: Work in the spillway channel will be preceded by installation of a sandbag cofferdam at the mouth of the confluence of the spillway channel and Rock Creek. Before the installation trench can be excavated, existing rock and soil, an 8 inch steel irrigation pipe, and a concrete `cap' that spans the channel just below the end of the weir's wingwalls must be removed. The sewer pipe trench will be 3 to 4 feet wide and excavated to a depth of nearly 6 feet below the top of the existing concrete in the channel. The trench will be lined with plastic sheeting, with the pipeline to be encased in concrete extending at least 18 inches below the bottom of the pipe; encasing it in at least 6 inches of concrete along the sides and top. Above the concrete, the pipe will be covered with rip-rap to a minimum depth of 1.5 feet. The rip rap will be placed between the existing wing walls and will extend south of the concrete pipe encasement, essentially to the confluence of the spil�way channel with Rock Creek. The total area of debris removal and channel restoration is approximately 323 square feet (0.007 acre). The proposed plan will raise the channel bottom upstream (north) of the pipeline, and lower it downstream of the proposed pipe. The rip rap will be used to dissipate water velocities below the weir to Rock Creek and armor the new sewer line to prevent headcutting of the channel, which could eventually compromise the sewer line. Outside of the perennial flow paths, the rip rap will be covered with compacted native top soil and secured using brush wattles staked parallel to the proposed contours. A temporary cofferdam will be placed at the confluence of the spillway and Rock Creek as an erosion control measure. More details regarding erosion control measures can be found in Section 5 of this permit application. * Italicized areas are not required by the Corps for a co�nplete application, but may be necessary prior to final permit decision by the Corps. As result of proposed project elements, there are no expected changes to the hydrotogic characteristics of Rock Creek, the spillway channel, or Bethany Lake. The project will have no effect on the quantity of water flowing through these waters of the State. As described above, the restoration of the channel is designed to dissipate stream flows through the spillway, resulting in a positive change in channel hydraulics. The proposed design will result in a decrease in erosive potential and an associated increase in bank stability in the channel. As the volume of water through the spillway is always significantly lower than flows in Rock Creek, there are no anticipated effects on hydraulics in Rock Creek. Measures to minimize potential effects on hydrologic characteristics are included in Spillway Crossing Design Considerations below. Construction Timinq: Work is anticipated to occur during the summer and fall construction periods of 2010, and during the spring and summer of 2011. Prior to the start of construction, all erosion control measures will be placed to ensure that no turbidity enters Rock Creek, Bethany Lake, Bethany Lake spillway channel, or wetlands. All in-water work associated with the trench across the Bethany Lake spillway channel will occur within the designated Oregon Department of Fish and Wildlife's (ODFW) in-water work window for Rock Creek and its tributaries, which is June 1 through September 30. The proposed in-water work will be completed using methodology suggested by SLOPES IV as described below. Wetland and water resources within the vicinity of the action area have been flagged to identify their location on base maps and construction documents. A detailed description of the spillway in-water work follows, with additional details shown on Figures 5A and 56. The work described for installation of pipe across the spillway channel, including restoration of the channel is anticipated to take 3 to 5 days. This includes erection of the sandbag cofferdam below the work area, removal of debris from the existing channel, excavation of the trench, the laying of pipe, establishing concrete around the pipe, and reconditioning of the spillway. The temporary cofferdam will be placed at the confluence of the spillway and Rock Creek as an erosion control measure. Due to the proximity of the spillway channel to Rock Creek, which is a state mapped Essential Fish Habitat, a biological assessment discussing the project in light of potential affects to listed fish species in Rock Creek will be prepared. State the number of project drawing sheets included with this application: 47 A complete application must include a location map, site plan, cross-section drawings and recent aerial photo as follows and as applicable to the project: Table 1. List of Figures: The following figures are included in Appendix A: Figure # Description � Figure # Desc Vicinity Map 2A-2C � Tax Maps 5A 5B Recent Aerial Photo Existing Conditions — Wetlands A-J, Rock C Bethany Lake Detail profile view of Bethany Lake spillway Plan view of Bethany Lake spill Staging Areas Key Key to plan view and profile of permanent and temporary im acts. PP1-16 Plan View and profile of permanent and temporary impacts to wetlands and Rock Creek Sheet 1 of 6 � Revegetation Plan EC1-12 C1-4 Detail of Erosion Control Plan Civil Sections and Details Will any construction debris, runoff, etc., enter a wetland or waterway? Yes � No � If yes, describe the type of discharge and show the discharge location on the site plan. The new sewer pipe will be placed at an average depth of 10 feet below current grade, as a result it is anticipated that shallow groundwater will be encountered. Dewatering of the installation trench will therefore be necessary along much of the alignment. As required by Clean Water Services, the contractor will remove and dispose of all water entering the excavated trench during the time the trench is being prepared for the pipe laying, during the laying of the pipe, and until the backfill has been completed. The contractor will be required to filter all water pumped from the trench excavation through a CWS approved system before the water enters a creek or wetland. Anticipated measures include utilization of a sediment filter bag. This type of discharge is anticipated along much of the alignment. However, due to the uncertainty of the need, the precise locations of these discharges cannot be determined prior to need. In relation to the need for dewatering the trench across the spillway channel, the required sediment filter bag will be located west of the spillway, in the vicinity of Station 3+00, along the southern edge of the temporary construction easement (see Sheet PP1). Based upon topography, discharge from the filter bag(s) will drain to Bethany Lake, not Rock Creek. Estimated project start date: July 2010 I Estimated project completion date: I September 2011 * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. 4 5) PROJECT IMPACTS AND ALTERNATIVES Alternatives Analysis: Describe alternative sites and project designs that were considered to avoid or minimize impacts to the waterway or wetland. (/nclude alternative design(s) with less impact and reasons why the alternative(s) were not cl2osen. Referertce OAR 141-085-0565 (1) through (6) for more information *). Sewer line Alternatives Three alternatives were evaluated to provide wastewater service to the NBPA. Alternative 2 was ultimately selected as preferred. Alternatives 2 and 3 are based on the concepts presented in a draft technical memorandum prepared for the NBPA concept plan in 2007. • Alternative 1 located all new conveyance infrastructure within the boundaries of the NBPA and included one main pump station and a small satellite pump station • Alternative 2 relies on gravity to convey all flow from the NBPA, but requires a gravity sewer to be extended west of the planning area, outside the UGB, eventually connecting with existing infrastructure in another area of the UGB. • Alternative 3 is similar to the second alternative, but included a pump station to convey flows from the northeast portion of the planning area into a southern trunk sewer. All alternatives were developed to locate new infrastructure in the proposed right of way to the greatest extent possible, to minimize creek crossings, and to locate required crossings in corridors identified for vehicle or bicycle/pedestrian crossings. Alternatives 2 and 3 included sub-options for providing service outside of the NBPA. Considerations associated with locating a gravity interceptor on the east side vs. west side of Rock Creek were addressed. Alternatives 2 and 3 also compared the impacts of providing a new gravity interceptor in SW 185 Avenue north of Springville Road (an area where existing topography poses significant challenges) with an alignment that follows natural contours associated with Rock Creek and its floodplain. Due to the depth to which the new sewer line would have had to have been installed (nearly 50 feet deeper than the proposed alternative); the alignment across the Rock Creek floodplain was selected. Table 2: Summary of non-financial analysis of sanitary service alternatives Alternative 1 Alternative 2(Gravity) Alternative 3(Hybrid) Pum Stations • No direct impacts to Rock • Requires construction in Rock . Requires construction in Rock Creek corridor Creek. Creek corridor Environmental . Crossings of Abbey Creek • Crosses several existing . Crosses one existing wetland Considerations wetlands Re uires on oin O&M access tributaries located in planned • q g g bridge or roadway corridors. ' Requires ongoing O&M access through sensitive areas throu h sensitive areas • Requires wetlands permit . Requires wetlands permit Ease of • No construction in wetlands, • Requires land use permitting Requires land use permitting for floodplains, or fish-bearing for construction on Exclusive � construction on EFU land in Permitting streams Farm Use (EFU) land in Washin ton Count �Nashington County • Some risk associated with • Construction generally in • Some risk associated with pump Ease of pump station wet well rights-of-way and agricultural station wet well construction in Construction construction in sloped area areas sloped area • Requires easement acquisition • Requires easement • Requires easement acquisition for pump station Timin Future acquisition for pump stations for extra-territorial sewer • Requires easement acquisition 9� construction for extra-territorial sewer Service Flexibility • Does not support service to � Greatest opportunity to serve construction future UGB expansion areas future UGB expansion areas • Greatest opportunity to serve future UGB expansion areas • Less reliable due to use of • More reliable due to all-gravity • Less reliable due to use of pump pump stations service stations Integration with • Minimizes natural resource • Includes extension outside of • Includes extension outside of Plan Concepts impacts. UGB UGB • Triggers greatest • Design limits impacts to natural • Design limits impacts to natural downstream im rovements resources. resources. * Italicized areas are not required by the Corps for a complete app&cation, but �nay be necessary prior to final peruait decision by the Corps. Revisions to oriainallv submitted sewer aliqnment Based on comments received during the public notice period for the application, CWS has changed the alignment to reduce temporary impacts to wetlands, to reduce the number of trees impacted by construction and to minimize the width of the construction corridor. The biggest change can be seen on Figure PP11 which shows the alignment impacting 0.11 acres less wetland than the original alignment shown on Figure PP13 (original application). This movement of the atignment away from the creek also reduces the loss of trees within the riparian area. Another change to the alignment is illustrated on Figure PP9, where the pipeline has been moved away from the riparian corridor of the creek (refer to Figure PP10 in the original application). In addition, the temporary construction easement has also been reduced in several locations by up to 25 feet. Most notably, the width through Wetland G has been reduced to 20 feet. Spillwav Crossinq Desiqn Considerations Initial plans for the crossing of the spillway below Bethany Lake called for boring of the crossing, as is proposed for the channel crossings beneath Rock Creek. During the final stages of design, contact was made by the project engineer with construction personnel who were familiar with conditions in the vicinity of the spillway. It was revealed that the subsurface around the spillway is not only composed of mixed soils, but also includes buried debris that would make boring for the pipeline not feasible. Without the ability to bore beneath the spillway channel, remaining options included excavation of an open trench; construction of a pump station to pump wastewater over the channel; or realignment of the trunkline to pass through/beneath Bethany Lake. Construction of a pump station immediately adjacent to Bethany Lake and Rock Creek was deemed a greater environmental impact than the open trench. Due to the shallow depth of the trunkline in this area, an alignment across the lake would be inappropriate as it would be located above the lake bottom, requiring it to be suspended, and infrastructure to hold the pipe in place would likely be visible during the summer when water levels in the pond drop below the elevation of the outlet weir. Boring or a siphon under the lake was also determined undesirable due to geological conditions and operational concerns. The spillway crossing is further complicated by the presence of an irrigation waterline that delivers water to an adjacent golf course. The existing line is located in the bottom of a portion of the spillway channel. Installation of the sewer line requires removal of the irriqation line and a cap of concrete that provides protection of the irrigation line. Channel restoration constraints include a proposed sewer line that is very shallow at this location; the required removal of the irrigation line and concrete cap; the need to armor the new sewer line as well as the spillway channel, which has been degraded by erosion caused by the irrigation line and concrete; and the need to avoid fish entrapment concerns between the weir overflow and the vicinity of the new pipeline. The above constraints, combined with the short distance between the weir and Rock Creek strictly limited restoration options in the channel. As a result, the focus was on erosion control, to prevent further degradation of the spillway channel and Rock Creek. Erosion protection for the confluence of the spillway with Rock Creek was designed to protect against a 25-year flow event. Flow data for the design storm was extracted from a HEC-RAS model of Rock Creek created by Clean Water Services for the purpose of floodplain mapping. The model provided peak velocity estimates for the main channel of Rock Creek. A simplified channel cross section was assumed for the Bethany Lake spillway, and maximum velocity was calculated using Manning's equation, assuming a minimum tailwater elevation in Rock Creek. Riprap diameter was calculated according to the methodology described in U.S. Army Corps of Engineers "Hydraulic Design of Flood Control Channels" (EM 1110-2-1601). Calculations results in a D30 of 6 inches and median diameter (D50) of approaching 9 inches, slightly larger than Oregon DOT specifications for Class 100 riprap. (ODOT specs classify riprap gradation according to weight. The conversion to diameter was made assuming specific gravity of 2.5). Class 200 riprap was therefore selected at the direction of Clean Water Services. Riprap is intended to be used only in the primary flow paths with brush wattles reinforcing the banks per Oregon DE(� guidance. Other channel restoration techniques that were considered but not utilized included installation of large woody debris, round cobble (as opposed to angular rip rap), and large boulders. Each of these is commonly used in channel restoration but are not appropriate for this site. Though the use of large wood provides bank stability and is good for directing flows, there is no more than 4 to 6 feet between the proposed utility line and Rock Creek. The installation of large wood of sufficient size to provide habitat and erosion control benefits would require excavation and recontouring of a large section of creek bank along the spillway channel and Rock Creek. In addition, large wood would be prone to capturing other woody debris that comes over the spillway and/or Rock Creek (beavers are active in this vicinity, including Bethany Lake). The development of a debris jam or dam in the spillway channel could result in considerable erosion below the spillway. Similarly, the use of large boulders in the channel would result in a more complex flow regime, and modeling flow to prevent erosion of the channel as a result of the boulders would be necessary. Cobble were considered as a"softer" alternative to rip rap but are not proposed because round rock has less ability to dissipate the water energy below the spillway, which is very important given the gradient from the proposed sewer line, down to Rock Creek. � Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. o Measures to Minimize Impacts: Describe what measures you will use (before and after construction) to minimize impacts to the waterway or wetland. These may include but are not limited to the following: For projects with ground disturbance include an erosion conrrol plan or description qf other be.rt management practices (BMP's) as apprapriate. (For more inf'ormation on erosion control practic•es see DEQ's Oregon Sedirnei�t u��d Ernsron Cu�tn'nl Mcoiuul) For work in waterways where fish or flowing water are likely to be present, discus.r how the work area will be isolated frnm the fTowing water. If native migratory fish are presen� (or were historically present) and you nre installing, replacing or abandoning a culverr or other patential obstruction to fish passage, complete and atrach a statement nf how the Fish Passu,�e Rc yui��e�nei�t.r, set by the Oregon Department qf Fish and Wildlife will be met. Project construction will follow best management practices (BMPs) and at a minimum, the following BMPs will be implemented: • Low pressure equipment will be required for work within wetlands to minimize soil compaction. • Tree fencing will be installed around the drip line of native trees greater than 6-inches diameter at breast height. • Removal of native trees will be avoided when possible. If necessary, felled trees will be left on site when appropriate. • All work within the spillway or wetlands adjoining Rock Creek will be done within ODFW's in water work window for Tualatin tributaries. • All staging areas will be located outside the wetlands and associated buffers. • Erosion control silt fencing will be placed around the downstream perimeter of all areas proposed for disturbance. See attached erosion control plan drawings for specifics. • In addition to the silt fences, bio-bags, straw wattles, straw mulch, and seeding will be installed on an as-needed basis. • Throughout project construction, all erosion control methods will be routinely inspected and maintained by the contractor. � +.,,i .�,. h.,i h �� .,+�..��Cn �f �±�r�, o��cnt� t� ang�,ira tl�at carijmgnt if �te�e�SaPy Civ�itiii i,viiu vi iilcu iv�S Si �ai� v2 L raded i� � 3� ��..� and sediment laden water do not leave the site. • In order to prevent unauthorized wetland impacts from occurring during project construction, the erosion control fencing will also serve to identify the limits of work. • All disturbed areas will be restored by seeding and/or mulching to stabilize any exposed soils. • Restoration of the temporary work areas within wetlands is further described in the Site Restoration section of this application. • To avoid the piping of groundwater along the pipe alignment, where the proposed alignment is located within wetlands, clay plugs will be utilized in the trench approximately every 100 feet. • Trench dewatering (described below). Contractor shall promptly remove and dispose of all water entering the trench excavation during the time the trench is being prepared for the pipe laying, during the laying of the pipe, and until the backfill at the pipe zone has been completed. Groundwater shall be controlled to prevent the softening of the bottom of excavations or the formation of "quick" conditions or "boils" during excavation. The water shall be disposed of in a manner approved by Clean Water Services and without damage to adjacent property. Contractor shall filter all water pumped from the trench excavation through an approved system before the water enters a creek, wetland or other storm system. As described previously, the Rock Creek crossings will be bored to avoid impacts to the creek and minimize impacts to adjoining riparian areas. * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permU decision by the Corps. Description of resources in project area: Ocean ❑ Estuary ❑ River ❑ Lake ❑ Stream ❑X Freshwater Wetland X❑ Describe the existing physical and biological characteristics of the wetland/waterway site by area and type of resource (Use separate sheets and photos, if necessary). The wetland delineation field work and data collection associated with this project occurred over a period of seven months; from August 2008 until March 2009. Specific dates of field work include August 12, 13, 19, 21, & 28; September 11 & 25; October 2, 2008; January 6, 2009; February 3, 2009; and March 25, 2009. Within the study area boundaries, PHS delineated several sections of Rock Creek, ten wetlands, and one pond (Bethany Lake). Of these resources, only Wetlands C and F will not be impacted by the proposed alignment. Soils within Wetlands A through J all exhibit low chroma soils with mottles, and therefore met one or more of the common hydric soil indicators. Wetlands A, D, and J do not continue outside of the study area, while Rock Creek, Pond A, and remaining wetlands each continue beyond the limits of the study area. All wetland and water features are discussed in greater detail and in the order they occur within the study area (from north to south). A functional assessment has been conducted on the wetlands to be impacted and is in Appendix B. Rock Creek Rock Creek is a perennial creek that flows generally south and west through the study area. Due to the fact that Rock Creek flows in and out of the study area, and defines the study area boundary in several sections, just 126,725 square feet (2.91 acres) of the creek are located entirely within the study area. The Cowardin class is riverine, permanently flooded, unconsolidated bottom; the HGM class is riverine flow-through (RFT). The banks of Rock Creek are generally incised, and the slopes, though steep, appear to be relatively stable. The substrate is comprised of clay and silty material. The forested riparian areas associated with the creek range from 10 feet to greater than 300 feet wide. Vegetation ;,�rsists �# a�� c�e;st:.ry t"a: typ;�a!!y in�l�d�� regcr a�h ;Fr u�:.^,G'& !a±ifeli�, F�(:�fU fln��lac fir I Pca�,�rlr,�t.gi�� menziesii, FACU), Western red cedar (Thuja plicata, FAC), Pacific willow (Salix lasiandra, FACW), big leaf maple (Acer macrophyllum, FACU), English hawthorn (Crataegus monogyna, FACU), and red alder (Alnus rubra, FAC). The understory commonly includes scrub-shrub species such as Himalayan blackberry (Rubus discolor, FACU), trailing blackberry (Rubus ursinus, FACU), snowberry (Symphoricarpos albus, FACU), oceanspray (Holodiscus discolor, UPL), Western wahoo (Euonymus occidentalis, UPL), Indian plum (Oemleria cerasiformis, FACU), red-osier dogwood (Cornus sericea, FACW), vine maple (Acer circinatum, FAC), and red elderberry (Sambucus racemosa, FACU). Common understory species include sword fern (Polystichum munitum, FACU), youth-on-age (Tolmiea menziesii, FAC), reed canarygrass (Phalaris arundinacea, FACW), tall fescue (Festuca arundinacea, FAC), bedstraw (Galium aparine, FACU), and stinging nettle (Urtica dioica, FAC). A section of Rock Creek located west of NW 185 Avenue between Wetlands J and G, has a narrow riparian area. The riparian buffer along both sides of the creek is approximately 10 feet wide, with mowed grass fields beyond. The grass is dominated by planted tali fescue and includes other grasses such as common velvetgrass (Holcus lanatus, FAC) and colonial bentgrass (Agrostis tenuis, FAC). Wetland A Wetland A is approximately 40,752 square feet (0.94 acres) in size and is located in the northern portion of the study area west of Rock Creek. Cowardin classes inciude palustrine forested (PFO) and palustrine emergent (PEM/PEMf); the HGM class is Valley Slope. Wetland A is relatively narrow, being confined by moderately steep slopes to the west, and well-drained floodplain soils to the east. The wetland is generally bordered by a grass seed field to the west, and by a forested riparian area to the east. Though the southwest extent of the wetland does include a narrow sliver of the grass seed field, most of the wetland is forested. As a result of agricultural land uses to the west, even areas outside the field are disturbed and are generally dominated by non-native pasture grasses or Himalayan blackberry. The wetland is comprised of an overstory of Oregon ash, English hawthorn, Douglas hawthorn (Crataegus douglasii, FAC), red alder, cascara (Rhamnus purshiana, FAC), and red osier dogwood. Groundcover vegetation includes reed canarygrass, short scale sedge (Carex leptopoda, FAC) and colonial bentgrass. Himalayan blackberry is common throughout. * Italicized areas are nat required 6y the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. The forested riparian area east of Wetland A is dominated by Oregon ash and red alder. By contrast, the riparian area north of Wetland A is more open. This area reveals a mosaic of hydrophytic and upland plant communities. Some areas are dominated by mixed shrubs and saplings, while others are dominated by grasses and forbs. Despite the divergent character in vegetative cover, soils across this portion of the Rock Creek floodplain were well-drained, very dark grayish brown to dark brown silt loams. Though several small Oregon ash trees are present, shrubs are the dominant woody vegetation. These include cascara, beaked hazelnut (Corylus cornuta, FACU), trailing blackberry, sweetbriar rose (Rosa eglanteria, FACW), thimbleberry (Rubus parviflorus, FAC), Pacific willow, red osier dogwood, and Himalayan blackberry. The vegetation in the understory consists of short scale sedge, sword fern, youth-on-age, common velvetgrass, reed canarygrass, self heal (Prunella vulgaris, FACU), horsetail (Equisetum arvense, FAC), aster species (Astersp.), colonial bentgrass, Queen Anne's lace (Daucus carota, UPL), and orchard grass (Dactylis glomerata, FACU). Wetland A's hydrology includes a seasonally high water table, but also includes shallow seasonal ponding. Geomorphic position and oxidized rhizospheres were the hydrologic indicators observed in the wetland during the October 2, 2008, data collection. A follow up site visit in January 2009 identified surface saturation and confirmed shallow inundation of up to 6 inches in the west central portion of the wetland. Wetland B Wetland B is approximately 21,864 square feet (0.50 acres) in size and is located east of Rock Creek in the northern portion of the study area. Cowardin classes include palustrine scrub-shrub and emergent (PSS/PEM); and the HGM class is Valley Slope. The wetland begins at the base of a moderately steep slope and extends westward across much of the Rock Creek floodplain. The plant community within Wetland B is composed of Oregon ash, red osier dogwood, Pacific willow, clustered rose (Rosa pisocarpa, FAC), slough sedge (Carex obnupta, OBL), reed canarygrass, tall fescue, colonial bentgrass, and soft rush (Juncus effusus, FACW). In contrast, the adjacent upland is primarily composed of Himalayan blackberry, tall fescue, colonial bentgrass, Canada thistle (Cirsium arvense, FACU), orchard grass, and common velvetgrass. Wetland B's hydrology appears to be from a high water table. Geomorphic position and oxidized rhizospheres were the hydrologic indicators observed in the wetland during the October 2, 2008, data collection. Wetland B continues off-site to the north, presumably to the edge of Rock Creek, which is located just north of the study area boundary. Wetland C The on-site portion of Wetland C, located in the northern portion of the study area west of Rock Creek, is 7,495 square feet (0.17 acres) in size. The wetland is just east of the cultivated tall fescue field and was apparently excavated for agriculturai purposes. The Cowardin class is PUBx with wetland vegetation around the edge and standing water in the center. The HGM class is Depressional Closed Permanent (DCP). The wetland does not have a direct hydrologic connection to Rock Creek. Though primarily open water, the fringe of ponding is dominated by reed canarygrass. In contrast, the adjacent upland west of the wetland is dominated by tall fescue and reed canarygrass with Canada thistle and St. John's wort (Hypericum perforatum, UPL). There appears to be a seasonal fluctuation in water levels of approximately 12 to 18 inches. The upper limit of seasonal ponding corresponds with the upper limit of saturation as observed during the growing season. Though the upper limits of the wetland were not saturated at the time of data collection on October 2, 2008, oxidized rhizospheres indicated saturation during the early growing season. The wetland continues off-site to the east. Wetland D Wetland D is approximately 13,384 square feet (0.31 acres) in size and is located in the northern half of the site, west of Rock Creek. The Cowardin class of the northern portion of the wetland is palustrine forested (PFO), while the southern portion is scrub shrub (PSS); the HGM class is Valley Slope. The eastern extent of this wetland includes a shallow depression confined to the north by a steep slope and to the south by the adjacent forested riparian area of Rock Creek. Seasonal flooding as observed in January 2009 revealed no more than 12 inches of water at its deepest point, though greater depths are possible. The plant community within the eastern portion of Wetland D is composed of Oregon ash with an understory of deadly nightshade (Solanum dulcamara, FAC), slough sedge and creeping buttercup (Ranunculus repens, FACW). In contrast, the adjacent upland is primarily composed of big leaf maple, oceanspray, Indian plum, Western red cedar, Douglas fir, snowberry, trailing blackberry, and an unidentified grass. _ * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. The western portion of Wetland D is vegetated by willow, Himalayan blackberry, creeping buttercup, and mixed grasses. The wetland boundary follows the presence of hydric soiis and seasonally saturated soils associated with seeps located along a moderately steep slope. Wetland D's hydrology appears to be from a high water table. Geomorphic position and drainage pattern were the hydrologic indicators observed on October 2, 2008. A subsequent follow up visit in February 2009 identified saturation at the surface and standing water. Wetland E The portion of Wetland E within the study area is approximately 102,607 square feet (2.36 acres) in size and located in the northern portion of the study area, just east of NW 185' Avenue, and north of Rock Creek. Cowardin classes include palustrine forested, emergent, and farmed emergent (PFO/PEM/PEMf); the HGM class is Valley Slope. The forested portions of Wetland E are composed of Oregon ash, Pacific willow, red osier dogwood, trailing blackberry, clustered rose, and reed canarygrass. The herbaceous portions include reed canarygrass, slough sedge, Canada thistle, tall fescue, and common velvetgrass. By comparison, the portion of the wetland that extends into the agricultural field includes tall fescue, false oat grass (Arrhenatherum elatius, UPL), common velvetgrass, and colonial bentgrass. The upland area west of the wetland is primarily composed of trailing blackberry, Himalayan blackberry, reed canarygrass, and common velvetgrass, though Oregon ash trees are common in the riparian area near 185' Avenue. Wetland E's hydrology appears to be from a seasonally high water table. Geomorphic position and oxidized rhizospheres were the hydrologic indicators observed in the wetland during the October 2, 2008, data collection. A follow up site visit in January 2009 identified standing water in the lowest elevations of the wetland, near the study area boundary. Wetland E continues off-site to the southeast, though it is not known whether it extends as far east as the west bank of Rock Creek. Wetland J Wetland J is a small wetland located west of NW 185' Avenue and northwest of Rock Creek. The wetland is approximately 805 square feet (0.02 acre) and located in a subtle depression east of a gravel driveway. A culvert connects Wetland J to a drainage that begins west of the driveway and continues outside the study area to the west. The wetland overstory consists of Oregon ash with an understory of sweetbriar rose, dandelion (Taraxacum officinale, FACU), fringecup (Tellima grandiflora, UPL), and nipplewort (Lapsana communis, UPL). The HGM class is Valley Slope. Wetland J's hydrology appears to be from a high water table. Geomorphic position, saturation and a water table at the surface were the hydrologic indicators observed on March 25, 2009. The associated upland data point did not have any active indicators of wetland hydrology; however, saturation at 14-inches was observed. Wetland F The portion of Wetland F within the study area is approximately 27,037 square feet (0.62 acres) in size and is located east of NW 185 Avenue and south of Rock Creek. The wetland is located on Portland Community College (PCC) property several hundred feet west of the main campus. The Cowardin class is palustrine emergent (PEM). Wetland F includes a channel located at the lowest elevations of this portion of the floodplain of Rock Creek. The channel has a defined bed and bank, but is relatively straight and has steep banks, suggesting a history of excavation. Wetland F is hydrologically connected to Wetland G to the west via a bridge crossing of the channel. The dominant HGM class is Valley Slope, but there is a Riverine Impoundment component, due to the presence of overbank flooding from Rock Creek that enters the floodplain and is impounded within the channel and the lowest elevations of Wetlands F and G. The plant community within Wetland F is composed of tall fescue, colonial bentgrass, and meadow foxtail (Alopecurus pratensis, FACW). In contrast, the adjacent upland is dominated by Himalayan blackberry, beaked hazelnut, common velvetgrass, and creeping bentgrass (Agrostis stolonifera, FACW). Both upland and wetland portions of the floodplain include shrubs and sapling tree plantings; an apparent vegetative enhancement project. Wetland F's hydrology is influenced by a seasonally high water table and overbank flooding of the floodplain channel. Geomorphic position and oxidized rhizospheres were the hydrologic indicators observed in the wetland during the August 28, 2008, data collection. A follow up site visit in January 2009 revealed several areas of standing water in the wetland that was visible from NW 185' Avenue. * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. lU Wetland G The portion of Wetland G within the study area is approximately 551,195 square feet (12.65 acres) in size. It begins just west of NW 185 Avenue in the central portion of the study area. The Cowardin class is predominantly palustrine emergent (PEM) across the northern extent, and becomes farmed emergent (PEMf) within a grass seed field at the southern tip of the wetland. This large wetland system is located south and east of Rock Creek and includes the central and southern sections of the floodplain channel that begins east of the study area, in the off-site portion of Wetland F. The channel generally defines the western boundary of Wetland G within the study area, though the wetland continues west of the channel as well. The channel that defines much of the western study area boundary is predominantly forested (PFO). Despite the presence of the channel in the wetland, the channel has no direct connection to other waters of the state. Wetland G is hydrologically connected to Wetland F, beneath the bridge of 185' Avenue. The dominant HGM class is Valley Slope, but there is a Riverine Impoundment component, due to the presence of overbank flooding from Rock Creek that enters the floodplain and is impounded within the channel and the lowest elevations of Wetlands F and G. It is unknown whether Wetland G continues through the forested areas west of the study area to Rock Creek and by extension, Wetlands H or I. The north end of Wetland G is located in a grass hay fieid so there is little difference between plant assemblages in the wetland and adjoining upland areas. Near 185 Avenue, a steep berm separates the herbaceous floodplain from a small nursery planted in ornamental plum, pear, and maple trees. A small upland "island" near the north end of Wetiand G is characterized by Oregon oak (Quercus garryana, UPL), serviceberry (Amelanchier alnifolia, FACU), Oregon ash, tall Oregon grape (Berberis aquilfolium, UPL), Himalayan blackberry, snowberry, and orchard grass. The forested area along the channel includes Oregon ash, Douglas hawthorn, narrowleaf willow (Salix piperi, FACW), Sitka willow (Salix sitchensis, FACW), cascara, and sweetbriar rose. The emergent areas are predominantly reed canarygrass, meadow foxtail, and/or tall fescue. Slough sedge, soft rush, and creeping buttercup are locally dominant. The farmed portion at the southern limits of the wetland was unvegetated at the time of the delineation and data collection. Wetland G's hydrology appears to be from a high water table. Geomorphic position and oxidized rhizospheres were the hydrologic indicators observed in the wetland during the August 28 and September 25, 2008, delineation and data collection. Site visits and data collection in January 2009 revealed shallow ponding (6 to 18 inches) in the northern and south-central portions of the wetland, with evidence that water levels had been 2 to 3 feet deeper at the high stand of flooding. Though ponding does not appear to be common in the gently sloped areas along the east and southern portions of the wetland, soils were saturated nearly to the surface in January 2009. Wetland H The portion of Wetland H within the study area is approximately 41,726 square feet (0.96 acres) in size and is located north of NW West Union Road and east of Rock Creek. The predominant Cowardin class within this wetland is PEM, though it is predominantly forested west of the study area. The HGM class is Valley Slope. Wetland H, which begins west of a tall fescue field is dominated by reed canarygrass. In contrast, the adjacent upland to the east is primarily composed of a narrow fringe of Himalayan blackberry with orchard grass, tall fescue, and Canada thistle, with the tall fescue field to the east. Though seasonal groundwater inputs from the west are likely, the primary influence on the hydrology of Wetland H is the perennial ponding to the west. As result of water levels in portions of the wetland west of the study area, soils remain saturated nearly to the surface much of the year. Though conditions were somewhat drier in September when this wetland was delineated, the wetland boundary also follows a relatively distinct topographic break that separates it from the adjacent field. Oxidized rhizospheres were also present and were used to confirm the topographic boundary. Wetland I Wetland I includes all wetland areas east of Rock Creek south of NW West Union Road. The total area of Wetland I within the study area is approximately 56,052 square ieet (1.29 acres). The north and central portions are palustrine forested (PFO) and the southern portion, west of Bethany Lake, is generally scrub shrub (PSS). A portion of the wetland that borders an off-site residential subdivision is actively mowed and is therefore dominated by herbaceous vegetation (PEM). The HGM class is Valley Slope. * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to fnal permit decision by the Corps. 11 The forested north and central portions of Wetland I are composed of an overstory of black cottonwood (Populus trichocarpa, FAC), Oregon ash, cascara, red alder, nootka rose (Rosa nutkana, FAC), and red osier dogwood. Due to a dense tree and shrub canopy there are fewer herbaceous species, though reed canarygrass, slough sedge, and youth- on-age are all common. The transition to upland vegetation is subtle. The forested areas include the same general overstory, though Himalayan blackberry and Western wahoo were definitely more common in upland areas. Sword fern was also more common, though generally not a dominant in these areas. The herbaceous vegetation dominating the mowed portion of Wetland I includes creeping bentgrass, tall fescue, creeping buttercup, and white clover (Trifolium repens, FAC). There are also seedlings of black cottonwood but these are also frequently mowed and do not grow into shrubs or trees. The scrub shrub wetland fringe west of Bethany Lake is dominated with plantings associated with a Clean Water Services' wetland and riparian enhancement project. The herbaceous species are generally mowed, especially in the vicinity of woody plantings. Dominant shrubs include nootka rose (both naturally occurring in small thickets and singulariy as plantings), thimbleberry, red osier dogwood, black twinberry (Lonicera involucrata, FAC), and Pacific ninebark (Physocarpus capitatus, FACW). Dominant herbaceous species include reed canarygrass, Canada thistle, hairy caYs ear (Hypochaeris radicata, FACU), and bird's foot trefoil (Lotus corniculatus, FAC). The riparian area between Rock Creek and wetlands west of Bethany Lake includes nootka rose, thimbleberry, snowberry, tall Oregon grape, trailing blackberry, black twinberry, Pacific ninebark, beaked hazelnut, sweetbriar rose, Himalayan blackberry, reed canarygrass, tall fescue, common velvetgrass, Canada thistle, creeping bentgrass, and colonial bentgrass. Wetland I's hydrology appears to be from a high water table. Geomorphic position, saturation at 6-inches, a water table at 10-inches, and oxidized rhizospheres were the hydrologic indicators observed in Data Point 46 collected on February 3, 2009. Data collected on September 25, 2008, did not include any active indicators of wetland hydrology, but that is likely because of the late season in which data was collected. Field observations in January and February 2009 revealed standing water, and evidence of recent flooding throughout the central and southern portions. Wetland I extends west of the study area boundary along the northern and central portions, but the souihern exieni was iocated entirely within the study area. There is a presumed hydrologic connection between the north end of Wetland I and Wetland H. That connection would include a direct surface water connection at the NW West Union Road bridge crossing of Rock Creek (located west of the study area), as well as a subsurface connection beneath the roadway. Pond A Approximately 34,950 square feet (0.80 acres) of Pond A(Bethany Lake) is located within the study area boundary. Bethany Lake is the result of an instream impoundment of a tributary of Rock Creek just prior to its confluence with Rock Creek. The Cowardin class is palustrine aquatic bed (PAB) where seasonally vegetated with cattails (Typha sp.) and pond lily (Nuphar lutea); and palustrine unconsolidated bottom (PUB) where it is too deep for rooted vegetation. The HGM class is Riverine Impoundment (RI). Pond A is hydrologically connected to the southern portion of Wetland I and overflows directly into Rock Creek. Pond A is hydrologically connected to Rock Creek near the southern limits of the study area. A concrete weir controls water levels behind it, though during high flows backwatering behind the dam can result in flooding depths up to a foot greater than the elevation of the weir. Pond A's hydrology is artificialiy controlled by the outlet weir. The actual depth of the pond is unknown but appears to be no deeper than 3 to 4 feet within the study area. Pond A continues beyond the study area boundary to the east. During the summer of 2008 water levels dropped as low a six inches below the weir, such that there was no water flowing from Bethany Lake into Rock Creek. The vicinity of the weir is dominated by mixed willow shrubs and small trees. The small area of adjacent upland within the study area is maintained by the Park District and is dominated by mowed grasses and Himalayan blackberry. Describe the existing navigation, fishing and recreational use of the watenvay or wetland. * There are no navigation opportunities in Rock Creek, due to its small width and shallow depth. Fishing is possible in Rock Creek, though there is no known use of this section of the creek for that purpose. Fishing is common in Bethany Lake, and small boats could be used on the pond. Recreational uses along the pipe alignment are limited as most of the property is privately owned. Passive uses are common in the park at the south end of the project area. * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. 12 Site Restoration/Rehabilitation: For temporary disturbance of soils and/or vegetation in waterways, wetlands or riparian areas, please discuss how you will restore the site after constructiort includin an � monitorin > i necessa �* Following the placement of the pipe and imported pipe zone backfill within the trench, the trench will be backfilled with native material. The top twelve inches of the trench will be filled with topsoil, and the ground surface will be restored to pre-construction contours. Upon completion of grading, all disturbed soil surfaces within wetlands will be restored. Temporary impacts have been reduced by narrowing the construction easement and where possible moving the pipeline out of the wetland and riparian corridor. Regardless of the actual extent of temporary wetland impacts. All temporary work areas in the wetlands will be restored to the existing grade and re-vegetated, as identified on the Revegetation Plan-BethanyArea Sheets 1 through 6. Temporary impacts to waters associated with the spillway channel below Bethany Lake will also be restored following construction. Temporary impacts to the spillway channel below Bethany Lake will also be restored following construction. The channel will be graded to a uniform slope of approximatety 0.04 foot per foot from the overflow weir to the utility pipe. From the pipe to Rock Creek the slope will increase to 2 to 1. To prevent the possibility of undercutting of the rock, rip rap will extend a foot and half below the existing creek bed. A layer of rip rap will also be set into the surface layer of concrete encasement around the utility pipe. Where rock is not located within the perennial flow path of the spillway channel, the rock will be covered with compacted native soils and secured with brush wattles. Wattles will be prepared and installed according to Oregon Department of Environmental Quality (ODEQ) methodology. Riparian vegetation along spillway and Rock Creek will be installed per attached plans (see Sheet 2). Mitigation T�escrdtie the reasonabl'y expected adverse ejfec�s oj tne developmeni �j ihis ��i°ujeci a��d 'naw the e�� cts r�ill be ,%�itigat�d. * The 0.002 acre of permanent impacts resulting from the installation of manholes will be mitigated by using DSL's payment in lieu program. The total amount would be $830 (0.01 acre x$83,000). No mitigation is anticipated to be required by the U.S Army Corps of Engineers, due to the very small area of permanent impact. Use of DSL's payment in lieu program will meet principal objectives because DSL will use the funds to enhance, restore, create, or preserve wetlands that are self-sustaining and ensure that wetlands are sited considering local watersheds. Miti ation Location Informafion Fill out onl when miti ation is ro osed or re uired Proposed mitigatiart Onsite Mitigation Type of mitigation: (Che�k a�l rhar apph�J: Offsite Mitigation X Wetland Mitigation Mitigation Bank Mitigation for irnpacts to other waters X Payment to Provide Mitigation for impacts to navigation, frshing, or recreation Street, Road or Other Descriptive Location Gegal Description (attach ta.r lot man Quarter/Quarter Section Township Range Not applicable In or near (City or Town) Courtry Tax Map # Tax Lot Wetland/Waterway (pick one) River Mile (if known) L.utin��le (in DD.DDDD for�nat) L.o�igitude (in DD.DDDD fonnnt) Name of waterway/watershed/HUC Name of mitigation bank (if applicable) � Attach a copy of all tax maps with the project area highlighted. * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. 13 6) ADDITIONAL INFORMATION Adjoining Property Owners and Their Address and Phone Numbers (if more than 5, attach printed labels*) K&R HOLDINGS LLC 17933 NW EVERGREEN PKWY #300 BEAVERTON OR 97006 METRO C/O METRO ATTORNEY OFFICE 600 NE GRAND AVE PORTLAND OR 97232 MARK E& LEISA L KRAUS 19180 NW NORTHSHORE CT PORTLAND OR 97229 JUDITH K WILLOUGHBY LIVING TRUST C/O JUDITH K WILLOUGHBY 19132 NW NORTHSHORE CT PORTLAND OR 97229 CHURCH OF JESUS CHRIST LDS 50 E NORTH TEMPLE 22ND FL �R�T L�KE �lTV i iT uai �n ROSENCRANCE LIVING TRUST 600 W HUBBARD ST #46 COEUR D'ALENE ID 83814 DARLA S HEXOM & M'LISS E HEXOM 19105 NE LOGIE TRAIL RD PORTLAND OR 97231 MYRNA G DYSLE LIVING TRUST C/O VERN V 7 MYRNA G DYSLE 6015 NW 185TH AVE PORTLAND OR 97229 ROBERT E& CHERI L ADAMS 19164 NW NORTHSHORE CT PORTLAND OR 97229 STEPHAN M SAFRAN 19116 NW NORTHSHORE CT PORTLAND OR 97229 CLARA M DOLEN 19140 NW ILLAHE ST PORTLAND OR 97229 CHARLES B& CHARLENE D ELIA 19185 NW ILLAHE ST PORTLAND OR 97229 RAE ANN BROWN & FLORENCE SANDBERG PO BOX 1324 BEAVERTON OR 97005 JAMAE L HILLARD-CREECY & DERRICK T CREECY 6315 NW 185TH AVE PORTLAND OR 97229 LE REVOCABLE TRUST 19148 NW NORTHSHORE CT PORTLAND OR 97229 KENNETH W& DEBORAH L BUSH 19070 NW NORTHSHORE CT PORTLAND OR 97229 JONATHON R HAY 19170 NW ILLAHE ST PORTLAND OR 97229 Has the proposed activity or any related activity received the attention of the Corps of Engineers or the Department of State Lands in the past, e.g., wetland delineation, violation, permit, lease request, etc.? Yes � No ❑ If yes, what identification number(s) were assigned by the respective agencies: Corps # State of Oregon # DSL #2009-0462 Has a wetland delineation been completed for this site? Yes � No ❑ Ifyes b�� whom?* I Pacific Habitat Services (Shawn Eisner and Michele Eccleston, Wetland Scientists) Has the wetland delineation been approved by DSL or the COE? Yes � No � If yes, attach a concurrence letter. * * Italicized areas are not required by the Corps for a complete application, but may be necessary prior to final permit decision by the Corps. 14 (7} CITY/COUNTY PLANNING DEPARTMENT AFFIDAVIT (TO BE COMPLETED BY LOCAL PLANNING OFFICIAL) * 1 have reviewed the project outlined io this application and have determined that: This project is not rec,,•ulated by the comprehensivc plan and land use regulations. This project is consistent with the comprehensive plan and land use regulations. This project will be consistent with the comp plan and ]and use regulations when the following local approval(s) are obtained. Condidona] Use Approval �l}�"� � 1� 'CdU l � f��' �C� �� 1GC,) Developmwt Permit C f{� ,� 1 a � n��t o�� o�n�� This pmject is not consistent with the comprehensive plan. Consistency requires a Plan Amandmcnt Zone Change Other An application haz � has not � been filed for local approvals checked above. G�j(`�� j��(Q}'� CO F1� .) Local ptanning official name (print} Sia ature Tide City 1. ounty i ; Date � T�-g-Y i��ti t�P— '`� ' s�i �� C'r.� � u�l� t N�c3T�tt �t •�, v Comments: ��5 h��. tmE,¢ �, Si - Iv �Ss �SS ��iJ� C�,�,it� °Y - ��+n�c/': �- a� m.i�..Q, 8 COASTAL ZONE CER7`IFIGATION * If the proposed activity described in your permit application is within the Orc�eon co�.ctal zonc, the following certificarion is required before your application can be prceessed. A public notice will be issued with the certification statement, which will be forwarded to the Oregon Department of Land Conservation and Development for iu concurrence or objection. For additional informarion on the Oregon Coasial Zone Management Program, contact the department at 635 Capitol Street NE, Suite 150, Salcm, Oreaon 9730] or cai] 503-373-0050. C6RTIFICATION STATEMENT I certify that, to the best of my Y.nowiedge and belicf, the proposcd activiry described in this application complies with the approved Oregon Coasta] Zone Management Program and will be completed in a manner consistent with the program. Print /Type \ame Title Applicant Signature Date 1 * Jta/ici;xJ areos are not reqvired by die Carps jor a coarp/e1e app/icalinn, but inay be necexe'ary prior toJtna! perunt aecrsron oy nre �orps. 9 SIGNATURES FOR JOINT APPLICATION Application is hacby madc fa thc sctivitia dcscribcd hcrcin. I ccrtify that I am familiaz with thc infocmadon concaincd in thc application, and, to t}�c bcsc of my Imowlcdgc and bclicf, this information is truc, compictq and accuratc. I furtha ccrtify that I posscss thc authority to undcrtakc thc proposcd activi4cs. By sigilng this application 1 conscnt to allow Corys or Dcpt. of State Lands stsff to rntcr mto thc aUovcdcsmbcd properry to 4 inspcU thc projcd locaaon and ro dctcrminc compliancc with an authorizarion, if grantcd. ] Lcrby authoriu thc person identificd in thc authorizcd agcnt bIockbclow to act in my bchalf as my agcnt ia thc procasing of this application snd to fiunish, upon m�ucst. supplemcatal information ia support of tbie pamit applicatioa L�md�xstaad that thc graoting of othcr pamits by Ixal, couaty, scatc or fcdcral agcncics docs not rcicasc mc &om thc roquiremcnt of obtnining thc peemits requcsted befom commencing the prpject. I undersiand [hal payment of the required state processfngL does notguarantee permit issuance. � Ti+efce for lhe state appticolion must accompmry the applicalion for completeness. Amounl endosed $902.00 Tidc Print /fypc Namc T�tle t.�., Wa�f� �A,t✓CQ� 1� Date Authorized Agent Signature Date � � � �I ` I 1 , . t'or projectr and /or mitigotio» workproposed on land not owned by the applicant, Sidud'vrg <tnte-ox�rvd svbmer2ed e .nrbmer.sifileland.e pleaseprovidesignatures6elow. AstgnaturebyrheDeparmrenrofStateLandsjoractivitietpropatedottstate-ow�red submergndlsubmersible Irmds onlygrants the applicant consext to applyfor aurhori_ation to conducr removaUfdl acdvities on such /andr. This signanrrefor activities on state-owned submerged and submersible lands �ranfs no o[her authoriry, ezpreu or implied PrintlfypcNamc Tiflc Print/TypcNaznc Tiflc PropertyOwnuSignature Date PropertyOwnerSignature Date Property Owner Sisnature Dste Print/lypeNawc Title Print/TypeName Tiflc Property Owner Signature Date properiy Owuer Signpture Date Pro e Owners ORTLAND COMMUNITY COLLEGE KAREN R PETBRKORT O'CALLAGHAN FAMILY � TTN: ACCOUNTS PAYABLE J[7DD, SI-IIRI.EY REVOC TRUST INVESTMENTS ; O BOX 6119 JORGENSON, SALLY REVOC TRST ET AL ATTN TIMOTHY O'CALLAGHAN � OHA OR 97007 11815 SW HII.LBORO iIWY 6955 NW 185TH AVE HII.T.SgORO OR 97123 PORTLAND OR 97229 TTJAT.ATIN HII.LS PARK & WESTHOOD INC RECREATION DISTRICT ATTN: J[N PARK I5707 SW WALKER RD 4675 SW 239TH AVE BEAVERTON OR 97006 ALOHA OR 97007 � "Im&ci.ed areas crc no7 rrquired by !he Corpsjor a wn+pletc appUca6on, but ma�• bc xecessary prior 1n fmaT permil decision 6y U�c Corps 17 0 rr�4r��r� c�w�v�� sT�rra��RC ��r� TAX Ll)7` IN118L+Ua014D '= We, the unds�•signecl, hei•eby �uthari7e the filing af Washin�ton Connty La�Yd Use Perinit � as well as �regoia T�ivision of State Laiid/U.S. Ai•my Coi�s of Elagineers reanoval/�ll pei�init applicakion ��elated to the Befhany Area SeweE• project, azld also authoriz� the ' designated Applicaijt's Representative froni Ctean Watet• Services #o act t�n ou�• behalf foz• ; tlie processing af the ret�iiest. n r� n � �.___ v � _ Stevcn A. Peterkort � ' i � � i , i r �''"� ,F'�� 3 f % �', `iC� i�en Ra .Peterkarl' _ � - �r�� f „✓":`t ,l_ �� ,��'�'� ,�-�, P��la A. Ma}�er —�—,�� fl . �-��`_�~._.. �� : ��.. Noxn�a�� J. Petei•koxt _ .�.. �., -„ �� r� �� .�, . ,� __�. Sandra M'. Lauberrthnl � � 7 ��V ' Y' _ MadaIyn M. lti�st =i � � ~ � »�� , ... ��.,��, ;.- �°-�. § Sheila Pe#ei•koi� Jenkins '�� J. Nefar o •t ' . � � � ��.� RoUe��k i�', l ! ,�,y._.,�� a. .r ��« I7flte �-�"" � '�-/� Date �` �'�,^ .-°� '��,� r� � t �:3 e �- �. I�ate � � ��-- ,�� I7ate �/ — �? -- � c:a Date V V �� Date � ... ' ��`�� f-- D�►te y q Zc�lO �ate � �� ,�i Date P1�.;8 � Q�� PROP�RTY OWN:CR STGNATDI2C PAGE TAX LOT INII SOOP020fI We, tlie undersigned, hereby authorize the filing of Wast�ingto�i Coui�ty Land Use Permit as �vell as Oke�on Division of Statc Land/U.S: Ariily Corps of Engi��eers re�»ovall�l( pex�n�it application z�elated to the Bethany Area Sewer �roject, and also autlioi•ize the desigtiated Applicant's Rep�•esentatiwe from Cleary Wate�• Services to act on oY�r behaif fo�• tlie processing ofttie reqt�est. PORTLAND COIvIMCTNITY COLLEGE DISTRICT � . � 3 �Y• � ��'* +� ' � (Sig here for entity) ''"� 7'ille: � _____�� _____ ` � I �Y • � I�ate 0 1'ROPCRTY OWN�R SIGNATUI� PAGE F TAX �OT IN224ACO3800 We, the unde�•sigr�ed, iiereby autl�o��ize the filing of Was{�ington Co�,�nty Land Use Per�nit � as wel! as Oregon Dsvision of State Land/U.S. Ax•my Corps of Engineers removal/fill ; pet�mit apptic�tion related to #!ie IIethany Area Sewer project, and alsa autl�orize fhe � desi��iated Applica�tt's Represe3�tative fi•ocn Clean Water Services to act on our behalf fa�• ' the processi��g of the request. TUALATIN HILLS PAYtK AND RBCREATION DISTRTGT By: _ � _` �,,. b.� „G�� ,ur enuty� TitIe: ' �� . � �� j � Date 9 PR()P�RTY O�VP+1�R SIGNATURE PAG� TAX L�T IN2130(102102 We, the undersigneci, hereby authorize the filing of Washington County Land Use Pel�nrit. as well as �regon Divisian of State Land/LT.S. Arniy Corps of Engineers removall�I1 pennit application related to #he Beth.any Area Sewei• project, and also a��thoi°ize the clesignated Applicant's Representative from Clean Water Se�•vices to act on our behalf for the pro�essing of the �•e�uest. WEST U�IION DEVELOPMENT, Li an 4regon limited Iiability con�pany, by its member - Westt�ootl I�ac., an �r.egon Corporation � �:.. . � .. �.�, � � �v. � � �°� {g'rgii l�ere roi� entity) Date Title: �� ,<��,, �. �..., k._.� PROPERTY C►WN�R SIGNATUI2� PAGE 7'A,YLOT IN2130001100 We, the �u�dersigned, hereby authorize the fiiing of Waslriiigto�i County Laz�d Use Permit ' as well as Oregon Division of State Land/U.S. Artny Corps of Engineers removal/#ill �e�•mit applicatian i•elated to tlie Bethaiiy Area Sewer ��roject, a1�d also a�ithorize the ' desig��ateci Applicant's Re�3�esentative from Clean Water S�rvices to aet o�i ou�• bel�alf far tlte processing of the reqttest. O'CALLAGHAN FAMILY INVESI'MENTS, LLC r ".�' ~ . ,. ��. Ti�n (7'Calla�lia��, Mazrager ' � r� "" �' ��t� ` Date A endix A pp Figures -� , _ , • `, . � ' • '�y � . __, . - .. � ; . , _ . .. . . .> _ -, ; . .• , ' �� _ - I . , � r. . �._ _ ._ , � �.. .�o . , �•• � . '�. � � -- - . . � . .-, - +; � , �, . . R, . . ��. , . . . . , . � � � • � '_. . . • • .. _ ' . N l'✓ GEANIAVif/N J• : � ., .. .'.7+' - �„� ; : • ' , __ � w ' . . . ' _- � ' , - :� � , ': � . `� - , � ` , � o �v . � ----------- --- � g • r " - . . • i, �i � � . . • � • �. � y s . + • , . A� I . _. „ � � . ��o . , . . _ _ � . � , . . . ' �.� ,� �.' . }. . �;.. �'_ ' . • �'� I . . • � • ' . . . . . . _._. ; ,. i ,_a_ 1 , _, , • ' , . , ,. � ., . � . , z.,� � • � . . t i . ; ' � , (, Bende eer � �� ' ; . • - � �. � ` • o�. . . . � � . , , , ' ,. :; . ._ ( �", { , • • • _ I ; .. I - ' � . ; � . . ., . . � . . . . � � � : ; ' .� � � , � . i . . �� "�ro -.._'.._ ...--_... ...._.� _ .i.�se . � � ' � i ) � � ^. � t , 4 i�! ! � � � I nnland C muv Colle9e�i . . , J � .� . ' r" . ,�� ... . . � �. � _ _ � r I k , ._., � �� R�ck C k C ��pus . �� . . . "":._1 . - . . � � - �. _ ._ • __ _ . _ . ._ � , ' . . . '�"�> West Union % , � � ` ' .� �., � ' ��E • ':j.' . ,.., . � -' . � t ..- '.��.t . • ' _. - . ; SPR�N�v� .� 3:, . , y , , . �, ;.. . �: � - � . . . __ , . . . ' ! ' '� , � � -- " I �� . � - - � _ W . . '�r, •, ( `L�Sf.. . 153 '��/� � . �_ _ r .= • , ' •N. ,_ .. • _ l '. �. G 2 � `�' I � i - . + ��. . . ' -. .. � � ; ' � SITE . . : -� • � �� ' ,r�� r �, : . � --. � � �. T r ! , i 1 ° . _ ' , � , F � � . . � . „ � . _. . _ , ' _ � �.. . . H � . . � •� r ; ,- x � °°� � � � :r. . , � � i ` _ ' � I . , �A ; f r � �3 . • ... t ' , _� f � i , ', ,, ._. � Bethany � � - . . � � � ; �.. . ,_: r i r , . . . - . : . , � .�` , ' , . . .- . � : ,—_., . . . �s,• .- - . _,, .: _-- �= : � � , ' ', , . _ , : 3 - �''{ . , , _ . .` `_ l • �` -�, � � . ,�� ,. �..; 1� �<' � �� ' ' t i' ` � � ., �� ,� . \ - '� � ': . '�J�y ' � � , � .. � �' � J f� 1 i'-�.� : .� � � / � � I7 � > � �� {'�' � 1 j £, � �� tt. � $ ) i �� 1 �� r _. �1 �- � — S ' � . . � � � 1 Y 4r # � . , � , r�, ... . � ' . a ' t . ; � �.: - , ° . '^ '. , �� l i - � r r �� ., � . �� . , � . . . , x � , ,- �.� , . � � i. � • � -� � • L. , � ,.,; i � ' � � ) ( � � � , , . ., �., _. .• • . ' . � > 's.1 � . I. ( '� ` _ �? . � . r -. . \ , �, i �'. .. � \ l � S ..�� i � /� B� � �BO � * (, � � ,. i. � � `' , . •� , ' �f� �3 _ , 3 ;�.. � *�_ erle � � �_+' J ;� � \ � ! ti �'"�� a , ,' i �" : a � .,� i : •.;.� � � • �� ...�.! i ; �li ��--- ,� - i � � hrv +/ �i � I . f . .�.pRhF }�1. _ _ _ L- _ - _ - _ �� +; * � ,- . � : . .. • 1 � , w Roao ,. � d . � __ ._._ �.._ 3/3/09 �� $ � � - �� i ; � j. i � _ �� ,� C b ,=---"� - � � .., i `� "�`+ i E I ' � i ' � �-�., a , �� , �- : � � � - . 1 r . ,� � � _ -� ;� } � . ,.r' �, . . � t ._. _:. < , � _ - � ., � .. � �y ,� �, 4� . '.. ""`� -- � � � " ; w ' r _ � �' r ,� � � �, .. , .. �� , . �'�� (/,�� , y �� _ j _ r � -, �i ', . � � -_�'�+.. . �' � ~ it � .._� � 3 �,{ J t � s2 \ ' qo �.. s ry � � /{ � 1. y ,� �-'� ', j � ' � AO- .. - � . t S ' _ � { �' L. � � 3 f� { ,._ � , i • . � ..' i ..._ . � � �, ` �. � ° : J_ . i ; .. ; -�. � �-� _ _ . ` � . � � �'� � . .. �_ ; `' .... � � : � � r ,i''i. . , ? ',� W t , � r , �µ ,�,:,,��. � � �-, �_ ;- t' �'' r .<. � � � ,. � ; �� 7� � � � � � �� "� � • / � � i r � � t , ` Hillsboro i ; � , � i ,, , _ � , � � .,� , E ' r ' � � ' � _ c, �oa� � __ �.:. 4�` ' � � , x i - �i] .� .4� . � �.., t�.3F Q_ ._ !. �._._.. � : r—__N�Y ,� ,i , .�• , ... `, ,� ' .. . ' ' � •-,.. . . i 4228 Location and general topography for the proposed Bethany Trunk Line Project in FIGURE Washington County, Oregon (USGS Hillsboro, OR and Linnton, OR quadrangles, 1990). 1 PHS � �p'n'�n L�ol�i4�4 �'arvinae Tnr SECTION 18 TIN RIW W.M. WASNINGTON C�DUNTV OREGON SCA�E I'•400' iz � ioo r�� •�••� � IE ;i L 7 � i. SEE NAP IN Q 13 �� w .r w uc� ! ■ 1� 1� A 1� ♦ ♦ ♦ ♦ �EEE �� IN : ! � i �� 1 13 � 24 a�� r 3/3/09 !EE MAP ir � m�u aM� � e IB I7 42� Tax Lot Map for the proposed Bethany Trunk Line Project in Washington County, Oregon (Tax Map 1 N 1 W 18, portions of lots 100, 200, 304). PHS � • —D....:f;.. A..1.;4.�4 Co...,,nnc Ton FIGURE 2A SEE MAP �N I 17C ,! 4 ��-� ' � e n I � 19 20 SEE� M11P IN 1`9A= r— . 1 � �.t �� IN 1 If IM 1 19lA �N 1 19�8 ( ■ ■ ■ ■ ■ ■ ■ Project Site . � I� 12 w re R.2 W.W.N�.' �� WasHU�cror+ cour+tr ix i�� . . % ' SCALE i"•400 �o% � �u. un. �/ IN 2 13 ��• IOTI �OBOAC 13 18 i}-0 . •..L—��— --1 _------�------`.a'--- ... ..— .M I �.�. ' SEE YOP I ♦ in� ie �,..w ' . � �` ■ ■ � � 0� 3 40 TO <C- � ' I � � � : � IN 2 13 I ■ ■ ■ ■ ■ ■ ■ Project Site 3/3/09 i i ■�� ■ ■ � 18 19 4228 Tax Lot Map for the proposed Bethany Trunk Line Project in Washington County, Oregon (Tax Map 1 N 2W 13, portions of lots 1100, 1201, 2100, 2102). PHS � . _P.�ni�n A�hi4�4 Carvirac 1nr FIGURE 2B voR ossessNewT auRPOSrs SWI/4 NE I/4 SECTION 24 T 1 N R2W W.M. FQi OTNEr� � WASHINGTON COUNTY SCALE I:100 ■ SEE MAP IN 2 IS � � ��``"" / � �,,..�.. � b "� ■ a �l00 , \`" �� • � � 1400 ��T�� ', '� �`I—�� soo �.,.. �� -'--UryrpN<_ �� \ , � • la �\�\ � ��/ � ,.... � f , V y, r 1600 .r��. \ ( TRACT �A" Q� 12z�1C. Q F � ` r S C, � '� \ P / IPn:I � ' °� '��oo '°'� � — j zico ^s>( �� ■ _ ' '� \� \ � � � - F— ' ic L � � �� uc� �� ■ z (� �BOO'?aT _ •�� ■ , � �q � 4. 0 / � 17 • ppp • � N 1900 � �t� , �b � : . 3 � iv � . u � g •,M _ " ;21 , ■ ! � g .b � " � t �,�' ' � , • ,O / � � SN.W. PONDOSA, C�i' a.�oo � / ��p ■ TA1�T' 2360 23 Z �' 22v � F / n ■ . ..�.:.: .�.; '� �� ■ ,�,, Q o / �--� .,�w ■ ■ ■ . ■ ■ _ "`� — ^�`\ `\ �,00 —�� 2.99 A[. C\� (� i J �`�(�� t.65 {C IN2i CLNCELLE[ 100 �� o� noo 400 e4�� 'Op in v � 760 eoo 900 t000 I I00 1200 60D 2100 zeoo �`R � � � 51-5�7''•'�� + �`�� 4 � 1 ��,�� • % BONNEVILL .F� '—�" �� ♦ -j iRaR"G" .«<"`4""` : � �,�_-. � �`� ` �� i:ra.� FI 4 � � � �/..-� - ---- -<<�;.- -== -- ,.'--�„r""S,� ' • -°_ ----� - _ — - `\``� .0 �v. �x�a.H �inc s. �'a''�' � ■ / �'' :I. �� A � r� i�� • _ : � 9�� BONNEVILLE �� ` • �POND I 4, L �,� \� POWER l • ADMINIS�� ATION I ; --{�- (`C,�-44{�,�TF � c:;� __ / � � I` `; / -- � N �PACSIFIC ROAD -- ` � I � ��.. �,,...y ,�'� POWER ■ B � � `�'`�� ',� a � _ �■ LIGHT _ _ ��a� � � 'a / :• � � — a �- -f -�-_ c � � � e C �� c � � -- - , • / � N � PORTLAND � \� • - 'T � - t GENERAL �� ELE 7rR�C I �� : 7 ■ � r, � �`�:�'� • ��-t � • ht�• � �t SEE t,f4P IN 2 24 A Y -t.-r ::�. �' W 1 ,,.�:� -_ SEE M4P IN 2 29vB : m IN 2 2 ■ ■ ■ ■ ■ ■ ■ Project Site I 3/3/09 4228 PHS � Tax Lot Map for the proposed Bethany Trunk Line Project in Washington County, Oregon (Tax Map 1 N 2W 24AC, portions of lots 3500, 3700, 3800). D....;{:.. LI.�L.:t.�+ Cn�-��:r.na inr FIGURE 2C �,. �« �- .�. � �m , -•- ;, , . ��' � p � � ¥ �� a f� ,. _ } � ,.._�'�.�.,�i, .. ... � , _r ` a K � p . ;'i � ..-. . � ' � ' . - .. �. �, ;,� �, ,. , . ' � R. . � . - '��t�'rt.� + .. .. �'��, k R- � � .� R ' �; � ..:.. . � ..-• �.��.�: � �. . �� .� ` �:..i 3 � y � t �' . ^ , � F $- �G 1r,�i�: � . . . �` .�} c � .�lf'st.�` �1� �� T�� g k �r 1' ,�€ tt .. , . . . � t . ; � . � . � » a � . � ' . � a - ' r�,� . �. + " � :� . � � } : aa� a • . �,q _ 4 f c . a � ' . � _ � � � .. .. ;f # .. � �� . ... . �.'. ,. �_..� � �' �#� .. . � .. . ,�+� r� � � °"� ��, + � � �� N � , � �� . a e Fg . �� . .y!"�mi1L.. S3 � � � �� i .. ,y .�� . S,� � '!if+�- �.. ..�� :f. � � �_ . � ' . � ,� . . . . i � P�� ' . .. '� °_ � f� F ; .. . ,.� _ � � r°� * i� � y. � '" �. �+,` � ,�.^ 3� �:� . � � ,.� � � �, : ��q ��, i � � . . �'«. �,� � � � , � � � . � - ' ,,,, �, :�' � �,� � �, ° � s� , ` �$ � °� ��+ �'� 1lF. ` ._ : , � � i � � ; y �r.'�. < :� , , ��_., � .�- �' € ��.§- ` t,.� z . . � ,� � : � e � � . �, �,a, ; i Y y ` ` '. F'c,ttlarxr� Comm��nity � ` -_ �� • � ;r�`� , � , ' � '* Colle�ye-Rue.k ��rk � J � ��..:=� �� ` �= �� . : . , a c � 4 v s. .— — � t: �_. + � _. __ ` . _ _. . ' * _ +^�-'_" _ � .� ' �r�4 , . � ^.- ' � �. '� '�° �,� � �' �. � _, !`" � �,' ,t ��,� � „„� � �� t' s�r ..�:+�f,. � �. . �:i i p�`� , . x ' �� . > # .:^ ' . � �.�t_c f . � . �,_ ' ' . , `�.. a ^ . F . 4� � . � . ,.. ., � � . ._ . .� _ . _ �. g_�". ,, � Park t =.r� . `� i,� ` «� �<}; � t.� � * . _ , .�, . . „�. , .�u ; .*�� , . 4.. � r - �: ^ a �.. a , . _ ' ; t .. °.a '^'��t� `s, � „ . '1 d i {.-� k � ` ..'f, � � . - � . ' > >-.�..� ,: �r 7�� .� ' , . . . . � `. ` . . 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( Yt'. � ,�— E � j' � � +�.�.,,,� y1�,F ,. � � "�' i �� , � � '� {�Sfa �' � 'ti � . - ��' ` � ,� ,: , , y }. � i v�� . ., : �y .` �:- �: .. . +e # 1 i . f' � • . . �. . ' . � . � d � � � * . � � � A �� ' *{+ �: . , , 8 ., : .. � � .. . - . . �, .. , f � - . . . �� . . . � , < < � , � d ,:t�r _:.�� -., .. . � _ .. . �r. _ �'�� -�� ` WETLAND B (21,864 SF/0.50 WETLAND A % � (40,752 SF/ ' 0.94 ACR� „ CREEK �E'1�4:AND C (7,495 SF/0.17 ACRE� D D (13,384 SF/0.31 ACR� WETLAND J (805 SF/0.02 ACR� CREEK WETLAND G �56 �, I S6 SH 12.66 ACRES) � 4a .. WETLAND (41,726 SF/ � 0.96 ACRE) � WETLAND WETLAND I (56,052 SF/ ROCK— I .29 ACRES CREEK TOTAL) WETLAND CREEK �HANY LAKE 950 SF/ ) ACRE) WETLAND E (102,607 SF/2.36 ACRES) WETLAND F (27,037 SF/0.62 ACR� WETLANDS B, C, E, F, G, H, AND 1 EXTEND BEYOND THE LIMITS OF THE STUDY AREA. N 600 lODO SCALE IN FEET 2/24/io Existing conditions and location of wetlands and waters of the FIGURE 422s State/US for the proposed Bethany trunkline project in Washington � � rxs County, Oregon. l 1.11. � Pacific Hahitat Services_ Inc. .r� X Y l WZZ � W Q Z w W W � e' � � U' W ° o� wz �o�WW�Y gC�j Z ~ m=z o�n g� U f-� ��0 �g�(p�j� I d� Q.fnLL. �� J �UO'�� OW�W�Z aH� U�Ut�zW �o�°n �`�Wo W �¢ �=o� o M p a 0 m � � w� w v a W �� p a W tA �� Z � W�it�i� tn o��o °zww�ac�ii �i-ZraLLZ�Q�o W UZ—Z� ��h =¢o��oW�Qm��w o�a��a�'om� a�Qwz�Y�i. Wu �a ° w¢�u Z��JJ�2QLL W 2'W O W aO vi�cn�oY�c�zc�c��o�nam3wow�ac�cn�c� w � Z � N c'M V' �n Z Q � J VJ LL L.1� w Z U � � _ i-- J L.L � d Z � X W Z¢ D �, � � W W � J W � � � W 3 •'. 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I � � �J , J j Q..' � � W � �� a ZZ¢ 1 � Wm¢ ❑ �� \\ W �� wc9u�i g� au.�rn � I a I O � I pN � Z W �'' � zmo az ��U Y � I 4 Z a `-°a� W � X�W U��;� i WUO1 � �/1 a v�= �� i VJ �o=w � i I I I I I O \ N N d" N vi � c � ±� � � c 0 U � � c a� � � T � N � � � � � � � � v •>- 0 L Q � rn .� a� a T a 3 . � � � � J T C Q t -+--+ � m � O � a� .� � 4- O L d � O � N �.1_.� � � � � � � , vi ' N � .� � � � x � � a _______________________________ r��r��r�rr��r��r�� r��rrrr��r��r�r��r��r ��rrr��r��rr�� rr��rr�rrr��r��r�r��r�r r��rrr��r��r�r�� JJ �, J �� \ CONCRETE ENCASE - EXPOSED 8" WATER PIPE ��= � �� J AT BASE OF WEIR � -- r�-�� f / ��r ��r,,� ` � PROPOSED CONCRETE �`ENCASEMENT 6" MIN /THICKNESS � � PROPOSED ��`'� 24" SEWER , �� i1 ��' � i �I � 1 � _�, �� : r _.- � ��: �� t -- r�. : lr �r r�, � rr�rr�r��e ,� Q �----�--� f �_ � �r \ ��'��r� 1\ \ � �.� �� --� � �� .�� PROPOSED EXTENT � r��JVER RIP-RAP WITH ^ � � �OMPACTED NATIVE SOIL - � OF RIP-RAP LAYER � = �,�r��r��'� ��INDEXTENDTOBANKS. � � � TEMPORARY � r�OIL TO BE SECURED BY � � ^ COFFERDAM � � r ��HERS USING BRUSH '� � �1(ATTLES STAKED � ROCK CREEK �FLOW —s r r =�'�RALLEL TO PROPOSED � �� r �9NTOURS SHOWN. - �. �, PROPOSED CONTOURS � — � CONCRETE ENCASEMENT EXISTING CONTOURS �1 OBSERVED HIGH WATER — W — WATER PIPE ^s,.��,� EXTENT OF BRUSH WATTLES — S — SEWER PIPE FINISHED GRADE SLOPE o 3 s 2:1 ------------- EXTENT OF RIPRAP � AND DIRECTION APPROXIMATE SCALE IN FEET s/�o/io FIGURE 4228 Plan view of Bethany Lake spillway. Design provided by �� Kennedy/Jenks Consultants, 2010. PHS . � � Pacific Habitat Services. Inc. � PROPOSED ALIGNMENT FOR 8"�.R PIPE � � --� � ,s � '\ PROPOSED FINISHER GRADE CONTOURS �\. � � � REMOVE AND RELOCATE � .� —� (E)8" WATER PIPE AND �CON�RETE ENCASEM�NT -, --��•. ------------�----- .r. � Y u; c� u! � U �` 1 , ~ J Z Q w W F � � � a�Z Wc�a O�� r-qw acWa¢ �v~ia ,._` � � 7� J �- CJ S� Z ? � �f J w t � ' OrG a u�i d� % �� x ci � . ,. '" /,-. _ _� � , j . .• � 7 d � a w Y � �. .. ....... � : • � w C7 C� O ��O zm� ` �� 'r j` � �.. u. � '� � \� ;y ♦ � �\ � � . � a� . � . wc7Q w a � r~nQ , � .� Upl\ON R � %-`. V�1�`� �� ^ % �; _ � 3 � �' / ,�� `� J � Y � �� Q� � � . � � Y w ��' Q ,,- �� U W O � / ! " � y � � � 1�y<' � , � � r z` /, a - � W . � % � . _ �Z �O> w c7W '= zUa Q ° a ai a .� � �d �� `, . SHEET PPl6 SHEET SHEE" N 1/13/10 Key to plan view and profile of permanent and temporary 4228 impacts figures. Provided by Kennedy/Jenks Consultants, �� ` 2010. PHS . � � Pacific Hahitat ServiceS_ inc_ rr� O � +° 0 0 J T O O N + 0 0 W + 0 0 � + 0 0 N + 0 � � � 0 � � T 0 � � T Q Q <� N � � y � � � � � � � ( � �� a o � � � � �� O .. g �� /3o/io Plan view and profile of permanent and temporary impacts to SHEET 422$ P P 1 wetlands and waters along the proposed sanitary line rxs alignment. Provided by Kennedy/Jenks Consultants, 2010. � � Pacific Habitat Services. 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Provided by Kennedy/Jenks Consultants, 2010. � � Pacific Habitat Services, Inc. .,�. � 0 + 0 0 � + 0 0 � N 1 T � � T W + 0 0 � � + U 0 � � + 0 0 T �1 + � 0 � v + 0 0 � a + 0 0 F �F � � F° �� FF��F� �,FF FF�F F , � �� FFF� � fi � � F F�SF F ,� �\� F F F ° � , F � � F � � F o � � FF � � a �� F FF � �� F FF Q F F � F n F ti � F � F F F � � F F \ F F � F � F � F fi a � � � F � F F > � F F F F a J F � I F F i 00 S "� F � F�k F J � � � F F F F �� F F F � os♦�F � F F F �� F F F � �� F QF�F � �� K F � � K� F F F F m = F F m ��F F k � F�� F �, F . �� C �� / � � / �' 0 � g ' O I �/3o/io Plan view and profile of permanent and temporary impacts to SHEET �22$ P P 6 wetlands and waters along the proposed sanitary line �xs alignment. Provided by Kennedy/Jenks Consultants, 2010. � Pacific Habitat Services, Inc. r r � T 0 0 r W T � � � 0 � 0 � � T � 0 � N + 0 0 N W + 0 0 N � + 0 0 N � + 0 0 N Ol + 0 0 � / � �� / Tm m m /� / m m� m m / / T � V m * m x m m � m T m T ,�. / , m m F m ' Z �'„ m T � m m � m T � T �� $ m f � ��\ � � � ( J m f / / ,n m m m . m . i � � � "� 8 �� T � T � � � � y 1� � L � m � ^ gl � m � O > � 6Ll � �� I °° s �� i i r i os ♦ � I � � � � ; � � � � � ' K r p � < ° � O O I q � � �� a � v °. � ` �� `_ � ! � � O �� ti o C 'J// ' [+H J � � � g � � i/ �. C °�, '- a , 0 � � e� � v•. � Qo � � � C° �^ ° � n D, ,,, � ' /\ \ � ' �o � �/30/�o Plan view and profile of permanent and temporary impacts to SHEET �22a v� wetlands and waters along the proposed sanitary line P P � W, alianment. 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An additiona122 manholes will be located within approximately 50 feet from the boundary of wetlands or other water bodies. Each manhole will result in approximately 7 square feet of permanent impact. The majority of wetland and buffer impacts will be temporary in nature and will result from construction work with the proposed 55 foot wide temporary construction easement. All temporarily impacted areas will be restored following construction. The easement will potentially affect Wetlands A, B, D, E, G, H, I, and J. A separate assessment was not completed for Rock Creek, Pond A, Wetland C or F because these areas will not be impacted, though these resources were considered when assessing adjoining wetlands. Table l summarizes the Cowardin and HGM classification for the wetlands on site. Table L HGM and Cowardin Classifications � ��'+�a� '�o�v�� C"lass �I�� . � _. _ Rock Creek PFOA Riverine Flow-through Wetland A PFO/PEM/PEMf Valley Slope Wetland B PSS/PEM Valley Slope Wetland C PUBx Slope Wetland D PFO/PSS Valley Slope Wetland E PFO/PEM/PEMf Valley Slope Wetland F PEM Valley Slope / Riverine Im oundment Wetland G PFO/PEM/PEMf Valley Slope / Riverine Flow Throu h Wetland H PEM Valley Slope Wetland I PFO/PSS Valley Slope Wetland J PFO/PEM Valley Slope Pond A(Bethany Lake) PAB/PUB Riverine Impoundment Several of the wetland have the same Cowardin and/or HGM classifications, therefore they were assessed together. These groupings of wetlands included (A, E, J), (D and I), and (B and H). Wetlands B and H have two different vegetation communities, PSS and PEM, however; they were assessed together, given that they both have the same HGM classification and other similarities. Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, Inc. Page 1 The findings have been summarized in Tables 2 through 5. Wetlands were not assessed for resident fish habitat, anadromous fish habitat, and thermoregulation since these functions were not applicable to the wetlands to be impacted by the project. A very small portion of Wetland G is permanently inundated. This are is associated with an excavated channel through a portion of the floodplain south of Rock Creek. Though it is technically feasible for fish to travel from the channel of Rock Creek to this portion of the floodplain during overbank flood events, there are no known fish in the section of channel that retains water. Therefore, this wetland was not assessed for anadromous fish habitat support. All wetlands within the project area lack a direct surface water connection to fish bearing streams during the summer, therefore, they do not provide thermoregulation functions. Wetland D has a very narrow channel connecting it to Rock Creek; however, there is no flow in the channel during the summer months. Most of the wetlands within the study area are seasonally saturated and dry during the summer; therefore, only Wetland G was assessed for breeding waterbird support. Wetlands A, E, J Table 2: Functional Assessment Results for Wetlands A, E, and J �taiue �nction Wetland Overall 5cores Assessment Water storage and delay 0.70 - High Sediment stabilization and Moderate to Water Quality hos horus retention 0.67 - High High Nitrogen removal 0.43 - Moderate Primary production 0.66 - Moderate Invertebrate habitat 0.57 - Moderate Fish and Wildlife Amphibian and turtle habitat 0.35 - Moderate Low to Moderate Wintering and migratory 0.30 - Low waterbird su ort Songbird habitat support 0.60 - Moderate Plant Community Support of characteristic 0.63 - Moderate Moderate ve etation Number values were assigned to low (0-U33), moderate (U.34-U.bb), ancl hign (u.bi-l.u) mncnons [o aescrine mese functions in the text. Water Qualitv • Functions: Water Storage and Delay, Sediment Stabilization and Phosphorus Retention, Nitrogen Removal Wetlands A, E, and J provide moderate t� high water storage and delay functions because portions are seasonally inundated. These wetlands provide high sediment stabilization and phosphorus retention, and moderate nitrogen removal functions. The moderate phosphorus retention values are due to the silty clay loam textured soils and there is little to no bare ground as these wetlands are entirely vegetated. Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, Inc. Page 2 Fish and Wildlife • Functions: Primary Production, Invertebrate Habitat Support, Amphibian and Turtle Habitat, Wintering and Migratory Waterbird Support, Songbird Habitat Support Wetlands A, E, and J score moderate for primary production because the wetlands are 100°Io vegetated, however, the site is dry for most of the year. The dominance of trees, shrubs and herbaceous vegetation (particularly in Wetland A) provides good structural diversity for wildlife use. The seasonal water levels provide a moderate level of habitat support for invertebrate species. Winter and spring water depths are likely too shallow for amphibian breeding or turtle habitat; however, can still provide a moderate level of habitat support. These wetlands provide only moderate songbird habitat because structural diversity is limited to only portions of each wetland, though each is bordered by more diverse habitat in adjoining riparian areas. The site also provides some habitat for wintering and migratory waterbirds. Native Plant Communities and Species Diversitv • Function: Support of Characteristic Vegetation Wetlands A, E, and J score moderate for support for characteristic vegetation because of the predominantly native trees and shrubs, though groundcover includes high percentages of non- native grass seed and pasture grasses. Though bordered by agricultural fields, the site is infreauently visited by humans on foot. Wetlands D and I Table 3: Functional Assessment Results for Wetlands D and I Value Function Wetland OveraU Scores Assessment Water storage and delay 0.50 - Moderate Water Quality Sediment stabilization and 0.65 - Moderate Moderate hos horus retention Nitrogen removal 0.45 - Moderate Primary production 0.68 - High Invertebrate habitat 0.60 - Moderate Fish and Wildlife Amphibian and turtle habitat 0.53 - Moderate Moderate to high Wintering and migratory 0.63 - Moderate waterbird su ort Songbird habitat support 0.59 - Moderate Plant Community Support of characteristic 0.57 - Moderate Moderate ve etation Number values were assigned to low (0-033), moderate (U.34-U.66), and high (U.6"/-1.U) iunct�ons to descride mese functions in the text. Functional Assessment far the NoRh Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, I�c. Page 3 Water Qualitv • Functions: Water Storage and Delay, Sediment Stabilization and Phosphorus Retention, Nitrogen Removal Wetlands D and I provide moderate water quality improvement functions because the wetlands are seasonally ponded. Wetland D maintains up to a foot of ponded water during the winter months. Wetlands D and I provide moderate sediment stabilization functions because they are located adjacent to a stream channel, therefore, they have the potential to remove sediment from the water column as flows spread out and slow down as they travel through the wetland vegetation. The wetland vegetation utilizes phospharus and nitrogen which provides nutrient cycling functions within these riparian wetlands.. Fish and Wildlife • Functions: Primary Production, Invertebrate Habitat Support, Amphibian and Turtle Habitat, Wintering and Migratory Waterbird 5upport, Songbird Habitat Support Wetlands D and I score moderate to high for primary production and wildlife habitat support. The wetland vegetation consists of forested, shrub, and herbaceous species and the adjacent buffer is forested so these wetlands provide structurally diverse habitat. The overhanging trees and shrubs provide cover for invertebrates. The wildlife habitat support functions are moderate because there are seasonal water levels and the winter and spring water depths are likely too shallow for ui'TiYi vi�.i.uiiis ^vi iuiii� ::u�.:u�. P^:rt:Onc� �f ��lµnul T hµ�� }�arj �nmP }]�ctnrir rlicti�rhanrPC with powerlines and pipelines, so this wetland provides slightly lower fish and wildlife habitat functions. Native Plant Communities and Species Diversitv • Function: Support of Characteristic Vegetation Wetlands D and I score moderate for support for characteristic vegetation. Trees, shrubs, and herbaceous plants are present and are fairly well dispersed. Wetland I is located in close proximity to a busy road, adjacent to residential development, a park, power lines, and is frequently visited by humans on foot. Portions of Wetland I located west of Bethany Lake have been planted with native shrubs due to past disturbance from utilities in the area. Wetland D does not appear to have been disturbed as most of it is located in a forested area. Wetlands B and H Table 4: Functional Assessment Results for Wetlands B and H Value Function Wetland Overall Scores Assessment Water storage and delay 0.85 - High Water Quality Sediment stabilization and 0.87 - High High hos horus retention Nitrogen removal 0.70 - High Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, Inc. Page 4 :. ��,. �� '�� ,� � '�� ` � � � �� : � �. ; � �� , ' , �� °a�'. °�` `�`� '` �.;�� # S^�:� � �^ ..� .'� �'z � 3 '�`�� Y � � r � Primary production 0.76 - High Invertebrate habitat 0.71 - Moderate Fish and Wildlife Amphibian and turtle habitat 0.64 - Moderate Moderate to high Wintering and migratory 0.75 - High waterbird su ort Songbird habitat support 0.77 - High Plant Community Support of characteristic 0.69 - High High ve etation NURlbei V81U0S WOTe aSS1gI10C1 t0 lOW �U-U.33), Il10UCTai� (V.34-U.00), dII(1 IDgn �v.o/-i.v� iuucuu�� w uc��iiuc uic�c functions in the text. Water Qualitv Functions; Water Storage and Delay, Sediment Stabilization and Phosphorus Retention, Nitrogen Removal W��lµn�l� R�nr� TT t n,rnyirla hibh watPr ct�r�aP �.nr� clelay functi�ns, The western nortion of Wetland H is a ponded area. Portions east of the pond have shallow winter ponding. Wetland B has a seasonal water table. These wetlands also provide high sediment stabilization and phosphorus retention and nitrogen removal functions. The high phosphorus retention values are due to the silty clay loam textured soils and there is little to no bare ground. Fish and Wildlife • Functions: Primary Production, Invertebrate Habitat Support, Amphibian and Turtle Habitat, Wintering and Migratory Waterbird Support, Songbird Habitat Support Wetlands B and H score moderate to high for primary production because the wetlands are 100% vegetated. The permanent water levels in Wetland H provide a moderate level of habitat support for invertebrate species and amphibian breeding or turtle habitat. Wetlands B and H provide moderate songbird habitat due to the structural diversity. The wetlands also provide a moderate level of habitat for wintering and migratory waterbirds as the western portion of Wetland H is predominately open water. Native Plant Communities and Species Diversitv • Function: Support of Characteristic Vegetation Wetlands B and H score moderate for support for characteristic vegetation because of the structural diversity of plants in these systems. Although there is a high percentage of non- native/invasive Himalayan blackberry (Rubus discolor) in both wetlands, this species does provide food, cover and habitat for wildlife. These wetlands are infrequently visited by humans on foot. Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habi[at Services, Inc. Page 5 Wetland G Table 5: Functional Assessment Results for Wetland G Value Function Wetland Overall Scores Assessment Water storage and delay 0.80 - High Water Quality Sediment stabilization and p_�� - High High hos horus retention Nitrogen removal 0.68 - High Primary production 0.72 -High Invertebrate habitat 0.67 -High Amphibian and turtle habitat 0.65 -Moderate Moderate to Fish and Wildlife Breeding waterbird support 0.62 - Moderate high Wintering and migratory 0.73 - High waterbird su ort Songbird habitat support 0.47 - Moderate I Plant Community I Support of characteristic I 0.55 - Moderate I Moderate I vegetation Number values were assigned to low (U-U.33), moderate (U.34-U.bb), ana nign (u.b i- i.v) runcuons to aescrioe inese functions in the text. Water Qualitv Functions: Water Storage and Delay, Sediment Stabilization and Phosphorus Retention, Nitrogen Removal Wetland G provides high water storage and delay function. This wetland also provides a moderate sediment stabilization and phosphorus retention and nitrogen removal function. The high phosphorus retention value is due to the silty clay loam textured soils, and there is little to no bare ground as the entire site is vegetated. Fish and Wildlife • Functions: Primary Production, Invertebrate Habitat Support, Amphibian and Turtle Habitat, Wintering and Migratory Waterbird Support, Songbird Habitat Support Wetland G scores moderate to high for primary production because it is 100% vegetated, however, the eastern portion contains a dominance of non-native herbaceous vegetation (Festuca arundinacea) which typically provides less carbon input than sites with a variety of plant forms (Adamus, P. R. 2001). The dominance of non-native pasture grasses in the eastern portion of Wetland G limits the structural diversity for �vildlife use. Both the permanent and seasonal water levels in this large wetland system provide a moderate to high level of habitat support for invertebrate species. Winter and spring water depths provide moderate habitat for amphibian breeding or turtle habitat. The wetland provides moderate songbird habitat due to the lack of structural diversity with a portion of the wetland being farmed grass field. The site provides high Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, Inc. Page 6 habitat value for wintering and migratory waterbirds due to the presence of a permanent water source associated with the backwater channel. The channel does provide some seasonal support for breeding waterbirds, as a few hundred lineal feet of the channel retains water year round; and the channel is bordered by predominantly herbaceous species. Native Plant Communities and Species Diversity • Function: Support of Characteristic Vegetation Despite some shrub areas, Wetland G scores moderate for support for characteristic vegetation because there is a dominance of non-native pasture grasses throughout; however, most of the site is infrequently visited by humans on foot. REFERENCES Adamus, P. R. 2001. Guidebook for Hydrogeomorphic (HGM)-based Assessment of Oregon Wetland and Riparian sites: Statewide Classification and Profiles. Oregon Division of State Lands, Salem, OR. Adamus, P.R. and D. Field. 2001. Guidebook for Hydrogeomorphic (HGM)-based Assessment of Oregon Wetland and Riparian Sites. I. Willamette Valley Ecoregion, Riverine Impounding nrrd ,Clnne/Flat.c Subclasses. Volume IA: Assessment methods. Oregon Division of State --�--- --r - - - Lands, Salem, OR. Functional Assessment for the North Bethany Planning Area Sanitary Sewer Trunk Line / PHS # 4228 Pacific Habitat Services, Inc. Page 7