Environmental Review Binder Documentation

Page 12Status of the Receiving WatersClark CreekClark Creek approaches the project area from the southwest before turning north and crossingMcGilchrist Street immediately west of Pringle Road. Clark Creek then turns abruptly to the westwhere it passes beneath 12th Street, then turns northward again to its confluence with Pringle Creekapproximately 3,500 feet from the McGilchrist Street crossing.The City of Salem Fish Passage Survey indicates there are five culverts on Clark Creek downstream ofMcGilchrist Street SE, which are fish passage barriers. The survey also shows a dam or weir structurelocated approximately 2,500 feet downstream of the McGilchrist Street crossing. Each of thesestructures is identified as a passage barrier for both juvenile and adult fish. The survey also indicatesthat a 1,500-foot reach of Clark Creek extending upstream from its confluence with Pringle Creek iscontained in an underground pipe.West and East Fork Pringle CreekWest Fork Pringle Creek approaches McGilchrist Street from the south before passing beneathMcGilchrist just east of the UPRR tracks. The West Fork then flows north along the tracks to itsconfluence with the East Fork of Pringle Creek at Oxford Street about 1,800 feet north of McGilchristStreet.East Fork Pringle Creek approaches McGilchrist Street from the south before passing beneathMcGilchrist west of 22nd Street and turning westward toward Walling Pond. The East Fork is thenshown flowing from the northern limit of Walling Pond to its confluence with the West Fork ofPringle Creek at Oxford Street about 1,800 feet north of McGilchrist Street.The City of Salem Fish Passage Survey indicates there is a dam or weir structure located approximatelytwo miles northwest of the McGilchrist Street crossing near the confluence of Pringle Creek with theWillamette River. This structure is identified in the survey as a passage barrier for juvenile fish.Fish PresenceAs described in the project baseline report, Clark Creek, East Fork Pringle Creek, and West ForkPringle Creek are known to contain native and non-native fish species including ESA-listed species(Coho, Chinook salmon, and steelhead). The existing habitat conditions for the streams are low tomoderate (Otak, 2016)ODFW in-water work guidelines restrict in-water work in the three streams to the period between June1 and October 15.V:\PROJECT\17500\17581\ProjectDocs\Permits\SWMP Memo.docx

Page 13Oregon DEQ 303(d) listClark Creek in the Middle Willamette watershed is documented to have the following water qualitylimitations: arsenic, biological criteria, dissolved oxygen, E. coli, dieldrin, pH, and temperature.Pringle Creek in the Middle Willamette watershed is documented to have the following water qualitylimitations: Aldrin, alkalinity, atrazine, bromacil, chlordane, chlorinated benzenes, chlorophenoxyherbicides, chlophrifos, chromium, copper, DDT, desethylatrazine, diazinon, dieldrin, dissolvedoxygen, endosulfan, endrin, guthion, heptachlor, hexachlorobenzene, hexachlorocyclohexane, lead,malathion, mercury, methoxychlor, metolachhlor, metribuzin, nickel, p.p. ODD, parathion, PCB,prometon, simazine, tebuthiuron, toxaphene, triclopyr, trifluralin, zinc, and habitat modification, EColi, pH, and temperature.Oregon’s 2012 Integrated Report Assessment Database and 303(d) list is available 2/search.aspPollutants of ConcernStormwater runoff from roadways subject to vehicle traffic may carry a variety of pollutants. DEQ’sStormwater Management Plan (SWMP) Submission Guidelines identify the following categories ofpollutants associated with roadway projects: Metals (zinc, copper, lead, etc.)Oil, Grease and Other PetroleumSedimentPolycyclic Aromatic Hydrocarbons (PAHs)The proposed stormwater management approach will use GSI (designed according to City, State, andFederal requirements) to treat site runoff. This stormwater management approach is an industryaccepted best management practice (BMP) for managing stormwater runoff from roadways, whererunoff is infiltrated and pollutants of concern are filtered out and broken down by bacteria in the soil.V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 14Proposed Stormwater Management PlanWidening and sidewalk improvements will occur along the entire length of McGilchrist Street SE (5300feet), and the following approximate lengths of all side streets: 50 feet of 13th Street SE 470 feet of Pringle Street SE 50 feet of 16th Street SE 50 feet of 19th Street SE 800 feet of 22nd Street SE 80 feet of 23rd Street SE 30 feet of Ford Street SE 1000 feet of 25th Street SEImpervious surface within the project limits is considered onsite impervious area and will be treated aspart of this project. Public roadways that drain towards McGilchrist Street SE are considered offsiteimpervious area and must also be treated as a part of this project. Offsite impervious area includesportions of 13th Street SE, 19th Street SE, Ford Street SE, and 25th Street SE. Table 2 shows theexisting and new impervious areas to be managed as part of this project.Table 2. CIA and Impervious Surface Area (ISA)Impervious AreaExisting (acres)Onsite10.16Offsite0.71Total10.87Proposed (acres)12.410.7113.12Increase (acres)2.2602.26Runoff from the proposed onsite and offsite impervious surfaces will be managed using GSIstormwater facilities sized in accordance with City, State, and Federal requirements using themethodologies and design criteria listed below.Stormwater Facility DesignThe proposed stormwater facilities were designed according to the most restrictive of City of Salem,ODOT/FAHP, and NMFS runoff treatment requirements as listed below. GSI Requirements (City): Use GSI to the maximum extent feasible (MEF). GSI facilities canbe partial infiltration when infiltration rates are less than 0.5 inches per hour.Water Quality Requirements (City): Provide pollution reduction for the water quality stormof 1.38 inches of rainfall in 24-hours.Flow Control Requirements (ODOT/FAHP, NMFS): Limit post-developed peakdischarge to pre-developed peak discharge for the 42% of the 2-year to 10-year storm events.Conveyance Requirements (City): Conveyance system to be designed to carry the 50-yeardesign storm flowing full.V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 15The project site was divided into 41 drainage subbasins. Water quality and flow control requirementswill be met using a variety of GSI partial infiltration facilities (planters, rain gardens, vegetated swales)to the maximum extent feasible (MEF). StormFilter treatment cartridges with MetalRx media will beused where GSI is infeasible.Existing drainage patterns will be maintained, and under proposed conditions, individual site subbasinswill continue to discharge to the same surface water. Existing storm outfalls that connect to either ofthe two culverts to be replaced will be reconstructed and will discharge through the wing walls of theproposed culverts.All of the proposed stormwater facilities will provide water quality treatment according to Cityrequirements. The City water quality requirements are the most restrictive. The City water qualityevent of 1.38 inches in 24-hours results in a higher peak discharge than the ODOT/FAHP and NMFSwater quality event of 50% of the 2-year.Proposed facilities that drain directly to the West and East Forks of Pringle Creek will be exempt fromflow control requirements. This area is exempt from providing flood control because it experiencesexisting flooding from Pringle Creek that impacts the road during 2-year and 10-year events.Stormwater flow control facilities in these locations would be ineffective due to surface water levelsbackwatering the stormwater facilities during storm events that are much more frequent than thedesign event. Increasing the elevation of the roadway surface would effectively create a levee thatwould increase flooding of private property in upstream areas. The flooding issues in this area will beaddressed though regional CIP projects identified through the surface water master planning projectdescribed earlier. The project challenges related to flow control were discussed in a project meeting onNovember 18, 2016. The meeting notes, which include design decisions related to flow control, are inAppendix A.Stormwater facilities that drain to Clark Creek and the unnamed ditch that crosses 25th Street SE will berequired to provide flow control. ODOT/FAHP and NMFS flow control requirements are identicaland are more restrictive than City requirements. Facilities that require flow control will limit the postdeveloped peak discharge to the pre-developed peak discharge for the 42% of the 2-year to 10-yearstorm events.Using knowledge of infiltration testing completed for other projects in the area and professionaljudgement based on what is known about site soils, we have estimated a design infiltration rate of 0.2inches per hour to complete the design of the GSI partial infiltration facilities.The following are additional design criteria for the stormwater system. The project GSI facilities will be categorized as partial infiltration facilities due to the low designinfiltration rate of 0.2 inches per hour, which is less than the 0.5 inches per hour threshold.Partial infiltration facilities will have a perforated pipe underdrain running the length of the facility.V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 16The list below gives a general description of the various GSI facilities proposed for the project. Thesefacilities have been designed to meet City requirements for these types of facilities. Planters – Primarily located between the curb and the sidewalk where possible; otherwise,stormwater planters will be located behind the sidewalk and a trench grate and channel willconvey stormwater under the sidewalk into each facility. The planters will be approximately 24inches deep and will require short concrete walls bordering the facility. The planters on theproject only provide water quality treatment. No runoff will discharge from the facilities duringthe water quality design storm.Rain Gardens – Located at the back of sidewalk and when possible a trench grate and channelwill convey runoff into the facility. In some cases a stormwater pipe will day light into thefacility. Rain Gardens will be approximately 4 feet deep with 3 to 1 side slopes. Where space islimited a short approximately 2 foot retaining wall will be provided. The rain gardens willprovide both water quality treatment and flow control. Discharge will be limited by anoverflow stand pipe and perforated underdrain. Runoff that cannot discharge will be storedwithin the facility.Vegetated Swale – The vegetated swale will be located between the back of walk on 22ndStreet SE and discharge to East Fork Pringle Creek. The swale will have a 6-foot bottomwidth, be approximately 4 feet deep with side slopes that range from 2:1 to 1.5:1. The swale willonly provide water quality treatment. The swale will be a minimum of 100 feet long with aminimum residence time of 9 minutes.Conveyance DesignThe stormwater conveyance system has been designed to, at a minimum, maintain the existing capacity.In areas where additional impervious area will discharge to an existing stormwater pipe that is currentlyat capacity, the existing pipe will be replaced with a new pipe that is a larger diameter.City stormwater conveyance requirements state that arterial roadway stormwater pipes should be ableto carry the 50-year peak runoff flow rate flowing full. Due to the limited elevation change between thewater surface elevations in the creeks and the roadway pavement, certain areas of the stormwaterconveyance system will operate in a surcharged condition for events more frequent than the 10-yearevent. The existing stormwater system operates under these same conditions.The following are additional design criteria for the stormwater conveyance system. Corrugated high-density polyethylene (or similar approved material) used for storm drain pipeswith cover of 30-inches or greater. Ductile iron pipe used for storm drain pipes where any length of the individual pipe run had lessthan 30-inches of cover. All pipe between structures to be of the same material. Flow rates calculated for offsite tributary areas represent existing conditions only. It was assumedthat new developments will provide detention to match the existing runoff hydrology.V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 17Stream Crossing DesignsMcGilchrist Street SE crosses three streams within the project area: Clark Creek, West Fork of PringleCreek, and the East Fork of Pringle Creek. The project will construct a cantilevered sidewalk overClark Creek and will not include any work on the existing culvert. The culverts at the West and EastForks of Pringle Creek will both be replaced with larger structures.A site meeting was held on March 25, 2016 to review project elements with the ODOT’s FAHP andNMFS liaison and the project team. During that meeting, the active channel widths (ACW) wereagreed upon and approaches related to stream crossing widths were identified. The notes from thismeeting are included in Appendix A. The typical regulatory requirement for the span of the twoproject stream crossings is 1.5 times ACW. As detailed in the meeting notes, the project teamdiscussed that a shorter spans would be permissible for this project due to existing site constraints. West Fork Pringle Creek Structure – The West Fork Pringle Creek structure will be astructural plate pipe arch with a span of 16 feet. The ACW of the creek is 14.3 feet. East Fork Pringle Creek Structure – The East Fork Pringle Creek structure will be aconcrete box culvert with a span of 20 feet. The ACW is 18.9, which is considered to beconservative by the project team.Culvert design criteria were established with the ODFW and NMFS as the primary governingauthorities. Stream simulation design methodology will be used, in which culverts replacements mustbe designed to allow fish passage, sediment transport, and debris conveyance.The culvert design criteria are summarized below: The minimum flow depth should be the same as the adjacent stream.The culvert slope should match that of the adjacent stream.The structure should be imbedded by 20 percent of the structure’s height or a minimum of 12inches.The stream bed material should mimic that of the natural channel with partially buried over-sizedrock included in the crossing if the structure is greater than 40 feet in length.No increase in upstream water surface elevations during the 25-year storm event.The steam bed materials should mimic that of the natural channel with partially buried oversizedrock included in the crossing if the structure is greater than 40 feet in length.The culvert replacements are intended to accommodate the proposed ultimate width roadwayimprovement.Upstream and downstream channel areas for both culverts will be restored using bioengineeringtechniques including native vegetation.The replacement culverts are not intended to mitigate flooding issues in the area. Analysis ofdownstream impacts related to the culverts replacement will not be performed as part of this project.V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 18The Salem Stormwater Master Plan Update project will address flooding in the Pringle CreekWatershed which includes the project area.References and BibliographyCity of Salem Department of Public Works, Administrative Rules Design Standards, Chapter 109Division 004 - Stormwater System. January Works/PW%20Administrative%20Rules/adminrule 109-001 109-007.pdfCity of Salem Department of Public Works, Standard Drawings No. 100-299 - Sewers and Drains.January Works/Engineering/EngDocuments/sp 200 storm.pdfFederal-Aid Highway Program (FAHP) Programmatic User’s Guide, Version 4: June AL/docs/Biology/FAHPESA/FAHP UsersGuideUpdate Final 2016.pdfFederal Emergency Management Agency (FEMA) Flood Insurance Rate Map (FIRM) Panel41047C0342H. January 2nd, ry Salem%20ORegon#searchresultsanchorGeoDesign, Inc. Draft Report of Geotechnical Services. McGilchrist Street SE CorridorImprovements. September 22nd, 2016.National Marine Fisheries Service (NMFS) Northwest Region. Anadromous Salmonid PassageFacility Design. July cations/hydropower/fish passage design criteria.pdfNational Marine Fisheries Service (NMFS) Northwest Region. Revised Standard Local OperatingProcedure for Endangered Species (Slopes V Stormwater, Transportation, and Utilities). March14th, 2014. ckable/NWR-201310411?overrideUserGroup PUBLIC&referer on%3dSESSION SEARCHOregon Department of Environmental Quality (DEQ). 1998 303(d) 98.htmOregon Department of Environmental Quality (DEQ). Section 401 Water Quality ce Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 19Post-Construction Stormwater Management Plan Submission Guidelines. May /stormwaterGuidelines.pdfOregon Department of Fish and Wildlife (ODFW). Oregon Administrative Rules 635-412-0005.Division 412 - Fish Passage. December 29th, 2016. http://www.dfw.state.or.us/OARs/412.pdfOregon Department of Transportation (ODOT) Highway Division, Hydraulics Manual.August 1st, TAL/pages/hyd manual info.aspx#Hydraulics ManualOtak, Inc. et.al. Draft Environmental Baseline Conditions Technical Report, McGilchrist Street SE:12th Street SE to 25th Street SE. April 2016.U.S. Department of Agriculture, Natural Resources Conservation Service (2012). Web Soil Survey ofClark County, Washington. e.htmV:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Page 20Appendix AProject Meeting Notes:March 25, 2016November 18, 2016V:\PROJECT\17400\17479\Reports\Surface Water Permit Support Memo\SW Permit Memo REV02-19-17.docx

Mason, Bruce & Girard, Inc.707 S.W. Washington Street, Suite 1300Portland, OR 97205-3530MEMORANDUMDATE:March 25, 2016TO:Donna Hinze (ODOT)CC:Aaron Kimsey (City of Salem) and Lynda Wannamaker (WannamakerConsulting)FROM:Daniel Covington (MB&G), Tom Walsh (Walsh Consulting Group), and KenAckerman (Otak)SUBJECT: Notes from the on-site FAHP visit for the McGilchrist St. SE: 12th St. SE to 25thSt. SE Corridor Improvements Project in Salem, OregonProject Summary:The purpose of the McGilchrist St. SE: 12th St. to SE to 25th St. SE Corridor ImprovementProject (project) is to reduce congestion by adding a center turn lane, bike lanes, and sidewalksthe length of the project. The project includes a realignment of 22nd St. SE to a single intersectionwith McGilchrist St. The project also includes improvements to intersecting streets, particularlyPringle Road SE and 25th Street SE widenings to accommodate additional lanes. The project willalso entail stormwater conveyance and treatment and replacement stream culverts. Clark Creek,East Fork Pringle Creek, and West Fork Pringle Creek are perennial streams that intersect theproject corridor. These streams discharge to Pringle Creek, which then disc

Feb 20, 2017 · ODOT Highway Division, Hydraulics Design Manual, 2014 ODOT Water Resources Specialist Manual ODOT Erosion Control Manual, 2005 Oregon Department of Fish and Wildlife (ODFW) ODFW Oregon Administrative Rules 635-412-0005 Federal-Aid Highway Program (FAHP)