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HomeMy WebLinkAboutApplication Applicant 9/6/2023City of Springfield Development & Public Works 225 Fifth Street Springfield, OR 97477 Site Plan Review SPRINGFIELD W 0#/ 111- Site Plan Review Pre -Submittal: ElMa'or Site Plan Modification Pre -Submittal, ❑ Site Plan Review Submittal: Q Ma'or Site Plan Modification Submittal: Required Project Information (Applicant. complete this section) Applicant Name: ScottCarver Phone: 503-545-4121 ❑ Company: Carver Family,LLC Email: Address: 112Timson Drive, Folsom, CA95630 Applicant's Rep.: Andrew Strout Phone: 541-746-0637 Company: Branch Engineering, Inc. Email:andrews@branchengineeringzom Address: 310 5th Street, Springfield, OR 97477 Pro ertOwner: ScottCarver Phone: 503-545-4121 Company: Carver Family,LLC Email: Address: 112 Timson Drive, Folsom, CA 95630 ASSESSOR'S MAP NO: 17-02-30-43 TAX LOT NOS : 6401 Property Address: 3654 Kathryn Avenue. Springfield, OR 97478 Size of Property: 3.13 Acres ❑x Square Feet ❑ Proposed No. of • n/a Proposed Name of Project: Description of if you are filling in this form by hand, please attach your proposal description to this application. Proposal: Construction of new warehouse building and associated parking Existing Use: HI- warehouse New Impervious Surface Coverage (Including Bldg. Gross Floor Area): 61,625 sf Si natures: Please sign and Drint Mour name and date in the acicirociriate Required Project Information (City Intake Staff., Associated Applications: box on the next complete this section) Signs: a e. Pre -Sub Case No.: Date: Reviewed by: Case No.: Date: Reviewed by: Application Fee: $ Technical Fee: $ Posta a Fee: $ TOTAL FEES: $ PROJECT NUMBER: Revised 1/7/14 10 1 of 11 Owner Signatures This application form is used for both the required pre -submittal meeting and subsequent complete application submittal. Owner signatures are required at both stages in the application process. An application without the Owner's original signature will not be accepted. Pre -Submittal Owner: The undersigned acknowledges that the information in this application is correct and accurate for scheduling of the Pre- Submittal Meeting. If the applicant is not the owner, the owner hereby grants permission for the applicant to act in his/her behalf. I/we do hereby acknowledge that I/we are legally responsible for all statutory timelines, information, requests and requirements conveyed to my representative. Date: Signature Submittal I represent this application to be complete for submittal to the City. Consistent with the completeness check performed on this application at the Pre -Submittal Meeting, I affirm the information identified by the City as necessary for processing the application is provided herein or the information will not be provided if not otherwise contained within the submittal, and the City may begin processing the application with the information as submitted. This statement serves as written notice pursuant to the requirements of ORS 227.176 pertaining to a complete annlirarinn Owner: Date: 09-01-2023 g ture Print Revised 1/7/14 Ia 2 of 11 Site Plan Review Application Process 1. Applicant Submits a Site Plan Review Application for Pre -Submittal • The application must conform to the Site Plan Review Submittal Requirements Checklist on pages 4-7 of this application packet. • A pre -submittal meeting to discuss completeness is mandatory, and pre -submittal meetings are conducted every Tuesday and Friday, from 10:00 am - noon. • Planning Division staff strives to conduct pre -submittal meetings within five to seven working days of receiving an application. 2. Applicant and the City Conduct the Pre -Submittal Meeting • The applicant, owner, and design team are strongly encouraged to attend the pre - submittal meeting. • The meeting is held with representatives from Public Works Engineering and Transportation, Community Services (Building), Fire Marshall's office, and the Planning Division and is scheduled for 30 to 60 minutes. The Planner provides the applicant with a Pre -Submittal Checklist specifying the items required to make the application complete if it is not already complete, and the applicant has 160 days submit a complete application to the City. 3. Applicant Submits a Complete Application, City Staff Review the Application and Issue a Decision • A complete application must conform to the Site Plan Review Submittal Requirements Checklist on pages 4-7 of this application packet. • A Type II decision, made after public notice, but without a public hearing, unless appealed, is issued within 120 days of submittal of a complete application. • Mailed notice is provided to property owners and occupants within 300 feet of the property being reviewed and to any applicable neighborhood association. In addition, the applicant must post one sign, provided by the City, on the subject property. • There is a 14 -day public comment period, starting on the date notice is mailed. • Applications are distributed to the Development Review Committee, and their comments are incorporated into a decision that addresses all applicable approval criteria and/or development standards, as well as any written comments from those given notice. • Applications may be approved, approved with conditions, or denied. • At the applicant's request, the Planner can provide a copy of the draft land use decision prior to issuing the final land use decision. • The City mails the applicant and any party of standing a copy of the decision, which is effective on the day it is mailed. • The decision issued is the final decision of the City but may be appealed within 15 calendar days to the Planning Commission or Hearings Official. Revised 1/7/14 Ia 3 of 11 Site Plan Review Submittal Requirements Checklist NOTE: • ALL of the following items MUST be submitted for BOTH Pre -Submittal and Submittal. • If you feel an item on the list below does not apply to your specific application, please state the reason why and attach the explanation to this form. ❑x Application Fee - refer to the Development Code Fee Schedule for the appropriate fee calculation formula. A copy of the fee schedule is available at the Development & Public Works Department. Any applicable application, technology, and postage fees are collected at the pre -submittal and submittal stages. ❑x Site Plan Review Application Form ❑x Narrative explaining the purpose of the proposed development, the existing use of the property, and any additional information that may have a bearing in determining the action to be taken. The narrative should also include the proposed number of employees and future expansion plans, if known. Density - if applicable, list the size of property (acres), maximum allowable density and the density proposed. ❑x Copy of the Deed ❑x Copy of the Site Plan Reduced to 81/2"x 11", which will be mailed as part of the required neighboring property notification packet. n/aF� State or Federal Permits Required - The applicant must demonstrate that an application has been submitted for any required federal or state permit and provide a copy of the application upon request. n/a❑ Completed Attached Scoping Sheet ❑x Four (4) Copies of the Following Plan Sets for Pre -Submittal OR Four (4) Copies of the Following Plan Sets for Submittal: ❑x All of the following plans must include the scale appropriate to the area involved and sufficient to show detail of the plan and related data, north arrow, and date of preparation. x❑ All plan sets must be folded to 61/2" by 11" and bound by rubber bands. Please Note: • These plans must provide enough information to enable the City to determine that the proposed development is feasible, but are not necessarily required to be detailed construction level documents. • The City's Engineering Design Standards Manual, while not land use criteria, may be used in whole or n part, by the City Engineer to determine the feasibility of a proposed plan. • Nothing herein should be interpreted as implying any requirement in contradiction of Oregon Statute or Oregon Administrative Regulation. Revised 1/7/14 KL 4 of 11 a. Site Assessment of Existing Conditions x❑ Prepared by an Oregon licensed Architect, Landscape Architect, Civil Engineer or Surveyor ❑x Vicinity Map x❑ The name, location and dimensions of all existing site features including buildings, curb cuts, trees and impervious surface areas, clearly indicating what is remaining and what is being removed. For existing structures to remain, also indicate present use, size, setbacks from property lines, and distance between buildings. n/a ❑ The name, location, dimensions, direction of flow and top of bank of all watercourses and required riparian setback that are shown on the Water Quality Limited Watercourse Map on file in the Development & Public Works Department n/a ❑ The 100 -year floodplain and floodway boundaries on the site, as specified in the latest adopted FEMA Flood Insurance Rate Maps or FEMA approved Letter of Map Amendment or Letter of Map Revision x❑ The Time of Travel Zones, as specified in SDC 3.3-200 and delineated on the Wellhead Protection Areas Map on file in the Development & Public Works Department n/a ❑ Physical features including, but not limited to trees 5" in diameter or greater when measured 4 '/3 feet above the ground (stands of more than five (5) trees may be shown as a cluster with mix of trees species noted), riparian areas, wetlands and rock outcroppings b. Site Plan ❑x Prepared by an Oregon licensed Architect, Landscape Architect, Civil Engineer or Surveyor ❑x Proposed buildings: location, dimensions, size (gross floor area applicable to the parking requirement for the proposed use(s)), setbacks from property lines, and distance between buildings; measured setbacks shall be prepared by an Oregon licensed Surveyor when minimum setbacks are shown. © Location and height of existing or proposed fences, walls, outdoor equipment, storage, trash receptacles, and signs ❑x Location, dimensions, and number of typical, compact and ADA parking spaces; including aisles, wheel bumpers, directional signs, and striping. ADA routes from public rights-of-way whall be designated including at grade connections x❑ Dimensions of the development area, as well as area and percentage of the site proposed for buildings, structures, parking and vehicular areas, sidewalks, patios, and other impervious surfaces n/a ❑ Observance of solar access requirements as specified in the applicable zoning district x❑ On-site loading areas and vehicular and pedestrian circulation ❑x Access to streets, alleys, and properties to be served, including the location and dimensions of existing and proposed curb cuts and curb cuts proposed to be closed ❑x Location, type, and number of bicycle parking spaces n/a ❑ Note location of existing and planned Lane Transit District facilities (within '/3 mile) Revised 1/7/14 Id 5 of 11 n/a ❑ Area and dimensions of all property to be conveyed, dedicated, or reserved for common open spaces, recreational areas, and other similar public and semi-public uses ❑x Phased Development Plan - where applicable, the Site Plan application must include a phasing plan indicating any proposed phases for development, including the boundaries and sequencing of each phase. Phasing must progress in a defined sequence addressing street connectivity between the various phases and accommodating the logical extension of other required public improvements, including but to limited to, sanitary sewer, stormwater management, water and electricity. The applicant must clearly indicate which phases are proposed for approval under the current Site Plan application and which are deferred to future review procedures. c. Existing Improvement and Public Utilities Plan x❑ Prepared by an Oregon licensed Architect, Landscape Architect, Civil Engineer or Surveyor x❑ Location and width of all existing easements x❑ Location, widths (of paving and right-of-way), and names of all existing streets, alleys, dedications or other right-of-ways within or adjacent to the proposed development, including jurisdictional status other than City. Indicate connection points for roof drainage. x❑ Location and type of existing street lighting x❑ Location of existing and required traffic control devices, fire hydrants, power poles, transformers, neighborhood mailbox units, waterline backflow preventers and similar public facilities x❑ Location, width, and construction material of all existing and proposed sidewalks, sidewalk ramps, pedestrian access ways, and trails x❑ Location and size of existing utilities on and adjacent to the site including sanitary sewer mains, stormwater management systems, water mains, power, gas, telephone, and cable TV. Indicate the proposed connection points. Detail must be proportionate to the complexity of the proposed project. x❑ Show existing and proposed spot elevations or contours, and direction of drainage patterns. d. Proposed Grading, Paving, & Utilities Plan x❑ Prepared by an Oregon licensed Civil Engineer, except where noted below x❑ The approximate size and location of storm water management systems components ❑x Location, widths (of paving and right-of-way), and names of proposed streets, alleys, dedications or other rights -of -ways within or adjacent to the proposed development ❑x Location and width of all proposed easements n/a ❑ Location and type of proposed street lighting n/a ❑ Information on existing slopes over 5% shall be prepared by an Oregon licensed surveyor and be drawn with one foot contour interval lines; land with a slope over 10 percent shall be shown with 5 foot contour interval lines Revised 1/7/14 Ia 6 of 11 e. Landscape Plan ❑x Prepared by an Architect, Landscape Architect, or other Landscape Professional approved by the Director ❑x Location and dimensions of landscaping and open space areas to include calculation of landscape coverage n/a ❑ Where applicable, screening in accordance with SDC 4.4-110 ❑x Location of existing and proposed street trees f. Architectural Plans ❑x Where abutting residentially zoned properties, exterior elevations of all proposed structures over 140 square feet for the development site, including height, shall be shown g. On -Site Lighting Plan ❑x Location, orientation, and maximum height of exterior light fixtures, both free standing and attached ® Type and extent of shielding, including cut-off angles, and type of illumination, wattage, and luminous area Additional Materials That May be Deferred at the discretion of the applicant until Final Site Plan or Building Permit Submittal: ❑ List in chart form the proposed types of landscape materials (trees, shrubs, ground cover). Include in the chart genus, species, common name, quantity, size and spacing d d ❑ Where plants are proposed as part of the stormwater management system, a planting plan shall be provided. D y ❑ Irrigation Plan showing of irrigation lines, required backflow preventers and above ground utilities. ® Photometric test report for each light source. © An applicant may submit conceptual floor plans in order to have staff address Resolution of potential nuisance conflicts Additional Materials That May be Required by the Director: IT IS THE APPLICANT'S RESPONSIBILITY TO DETERMINE IF ADDITIONAL STANDARDS/APPLICATIONS APPLY TO THE PROPOSED DEVELOPMENT. THE APPLICANT SHOULD CONSIDER UTILIZING PRE -DEVELOPMENT MEETINGS AS DISCUSSED IN SDC 5.1-120: ❑x Copy of a Preliminary Title Report issued within the past 30 days documenting ownership and listing all encumbrances. n/a ❑ A developer may be required to prepare a Traffic Impact Study (TIS) to identify potential traffic impacts from proposed development and needed mitigation measures. Revised 1/7/14 Ia 7 of 11 n/a ❑ Where a multi -family development is proposed, any additional materials to demonstrate compliance with SDC 3.2-240 n/a ❑ Riparian Area Protection Report for properties located within 150 feet of the top of bank of any Water Quality Limited Watercourses (WQLW) or within 100 feet of the top of bank of any direct tributaries of WQLW n/a❑ A Geotechnical Report prepared by an engineer must be submitted concurrently if the Soils Survey indicates the proposed development area has unstable soils and/or a high water table, or if required by the City Engineer n/a ❑ Where the development area is within an overlay district, address the additional standards of the overlay district on plans and narratives n/a ❑ Where physical aspects of a proposed development, including but not limited to scale, odor noise, glare or vibration, will impact less intensive surrounding uses, the Director may request submittal of conceptual floor plans or other information necessary to determine compliance with applicable standards. n/a❑ If five or more trees are proposed to be removed, a Tree Felling Permit as specified in SDC 5.19-100 n/a❑ A wetland delineation approved by the Oregon Division of State Lands must be submitted concurrently where there is a wetland on the property n/a❑ The applicant must demonstrate that an application has been submitted for any required federal or state permit and provide a copy of the application upon request n/a ❑ Where any grading, filling or excavating is proposed with the development, a Land and Drainage Alteration permit must be submitted prior to development n/a ❑ Where applicable, any Discretionary Use or Variance as specified in SDC 5.9-100 and 5.21-100 n/a ❑ An Annexation shall be submitted prior to submission of application, as specified In SDC 5.7-100, where a development is proposed outside of the city limits but within the City's urban service area and can be served by sanitary sewer Revised 1/7/14 Ia 8 of 11 anch MGINEERING- S-,,,7, August 25, 2023 WRITTEN STATEMENT CARVER FAMILY - SITE PLAN Branch Engineering Inc. Project No. 21-749 The site is located at 3654 Kathryn Avenue (TM 17-02-30-43, TL 6401). The site is 3.13 acres. The site is underdeveloped with a structure and associated vehicle circulation on the easterly 1.76 acres. The remainder of the site is undeveloped. The building is currently being used as a car repair facility. The proposal is to construct a 17,000 square foot warehouse with commercial truck loading docks, associated parking and stormwater facilities. The parking/drive area on the westerly side of the existing building will be regraded in some areas to incorporate the truck loading docks and back entrance to the new structure. The existing building will be retained for its existing purpose. A trash enclosure will be provided for the new structure as the existing structure currently has trash facilities located within the structure. The site currently has two driveway approaches to Kathryn Avenue. A third will be added near the westerly edge of the site to access the new structure's main entrance. The two existing driveway approaches will be updated with curb returns and regrading to support ADA access and compliance. Along with the private improvements, additional public improvements within the Kathryn Avenue right-of-way will be incorporated into the design. These include setback sidewalks, a stormwater runoff drainage ditch, and street trees. These will be encapsulated within an encroachment permit. The ditch will extend westerly to the 351h Street intersection to prevent rainwater pooling. The tentative site plan review application pre -submittal checklist was met in the following manner: • No phasing is planned for the development. • A seed mix and landscape notes are included on the plan set for all landscaped areas. • The architectural plan is included in the plan set. • A lighting cut sheet is included in this submittal. • All areas of the development, including the existing asphalt to remain, is to be graded to proposed drainage structures. EUGENE SPRINGFIELD ALBANY 310 Sth Street, Spnngfield, OR 97477 1 p- 541.746.0637 1 v .brancheng ine nng.mm Written Statement August 25, 2023 • A Technical Memo is included in this submittal detailing why a TIA is unnecessary for the site. • The size of the building has been reduced to allow for additional traffic circulation. • In order to allow high piled storage, the building will be sprinkled, which also removes the need for an additional hydrant. gmnch Engineenng, Inc. Page 2 of 2 TECHNICAL MEMORANDUM ranch ENGINEERING= DATE: August 25, 2023 PROJECT: Carver Kathryn Ave., Springfield Site Tax Lot: 6401 ��0 PKOFF Assessor's Map: 17-02-30-43 Branch Project No. 21-749GIN,g ¢#79199PE r TO: Tom Sievers, PlannerISI itally Signed City of Springfield OREGON FROM: Dan Haga, P.E. EXPIRE$: JaVE 30, 2025 RE: Site Trip Generation for TIA Applicability To document the trip generation potential associated with the proposal to improve a portion of the existing site identified on tax lot 6401 of tax assessor's map 17-02-30-43, I am providing this memorandum summarizing the projected post development site generated traffic and land use assumptions associated with the proposed improvements. The site is within City limits of Springfield and is generally located northeast of the intersection of 35'° Street and Kathryn Ave, north of existing termini at 36'° and 37m Streets. The result of this memorandum demonstrates that the proposed post -development traffic conditions do not trigger a formal traffic impact analysis review per the codified trip generation thresholds of 100 peak hour trips and/or 1,000 average daffy trips (ADT) identified in City of Springfield Development Code, section 4.2.105(B)(1) & (B)(2) for new development proposals. Existing Conditions The subject site is identified on the undeveloped/vacant portion of tax lot 6401. The developed portion of the tax lot is currently addressed as 3654 Kathryn Ave, and is developed with a building totaling approximately 17,500 square feet (17.5 thousand square feet/KSF) that is utilized for industrial uses as permitted by the City of Springfield. The existing developed and permitted industrial use is not currently planned to be significantly changed or altered with the current development proposal, except that a covered outdoor storage canopy is may be removed from the site to allow for improved vehicle maneuvering around the rear of the proposed new building. Proposed Improvements The proposed improvements include constructing a new building on the vacant portion of the land at the site with approximately 17,000 square feet (17.0 KSF) of gross building floor area that will be utilized for industrial uses and is most accurately described by an industrial park type of use as permitted in the City of Springfield's Heavy Industrial zone, per SDC Table 310 5th Street, Spnngfield, OR 97477 1 p- 541.746.0637 1 1 w .branchengineenng.com Carver Kathryn Ave Site Traffic Memo (21-749) August 25, 2023 3.2.420. As currently shown on the plan, the new building will have large bay doors at the rear fagade of the building to serve each of the three proposed tenant units, with parking at the front fagade (west side) of the building. Each unit. will be equipped with a small ancillary office area and restroom facilities. Trip Genemtion and Site Operations As described previously, the site's proposed use, and the use overall (including the existing industrial use) is most closely aligned with an industrial park type of use, which aligns best with the Institute of Transportation Engineer's (ITE's) Land Use Code 130, Industrial Parkin the current, 11'" Edition of the Trip Generation Manual. The trip generation from ITE's Land Use Code 130 -Industrial Park was applied to the gross floor area (GFA) of the proposed new building to calculate the potential trip generation with the ITE onhne web utility. The ITE Trip Generation Web utility rates are based on the published national average trip generation rates available for the category/type of use. The following table provides the potential trip generation the proposed use is projected to generate, based on the most recent ITE data available: As shown in the table, with the application of the ITE trip generation rate for an industrial park type of use applied to the proposed building gross floor area of 17,000 square feet, the new building area's use type could generate 57 average daily trips, with an estimated six of those trips generated during each the AM and PM peak hours of adjacent street traffic or seven of the trips occurring during the site's AM and PM peak hours of trip generation (peak hour of the generator). The proposed industrial park use (overall or the incremental GFA proposed with new development) is generally smaller than others that are included within the data set Branch Engineenng, Inc. Carver Kathryn Ave Site Traffic Memo (21-749) August 25, 2023 available for the ITE Industrial Park category of use, and the rates provided are average rates for the data sets included in the ITE database. Conclusion In summary, based on City of Springfield Development Code (SDC) criteria contained within SDC 4.2.105(B)(1) & (B)(2) for new development proposals, the proposal to construct a new 17,000 square -foot building to be utilized with an industrial park type of use does not require a formal traffic impact analysis review to be included, since it will not generate greater than 100 peak hour trips during any identified peak hour [SDC 4.2.105(B)(1)] and will not generate 1,000 or more average daily trips [SDC 4.2.105(B)(2)] after new development occurs and the units are fully occupied. The site generated traffic is not expected to result in any significant identifiable impacts to the existing transportation system, which would be indicated by increasing traffic that contributes to any known traffic problems in the area based on safety, speed or congestion. Please do not hesitate to contact me if I can provide any additional information, or if you prefer, we can schedule a formal meeting to discuss. Branch Engineenng, Inc. aF FXO OUTDOOR LIGHTING LNC COMPACT LED LITEPAK FEATURES Compact LNC LED is designed for perimeter illumination and available in 3 lumen packages for safely, security and identity 3000 K, 4000K, 5000K and Amber color temperatures Up to 41 spacing to mounting height ratio means fewer fixtures to install Acrylic dRfuser includ ad! Use for applications near entrances or locations where reduced brig fitness is desired. (Maximum spacing with diffuser 30ft) Die-cast aluminum housing with decorative Laredo styling Full cul -off neighbor friendly Listed to UL1598 for use in wet locations SPECIFICATIONS CONSTRUCTION • Decorative the -cast aluminum housing and door • Rugged design protects internal components and prwides excellent thermal management for long life • Powder paint finishes provide lasting appearance in outdoor environments • Full cul -off distribution; Ambient diffuser included, use for applications near enlerances or locations where reduced brightness is desired OPTICS • Drivers are 120-27N, 50/60Hz Type II, III and Type IV lenses provide wide lateral spread •3000K 80 CRI,4000K-70CRI, and 5000K -70 CRI, CCT nominal • Drivers have greater then .90 power factor endless than 20% Total Harmonic Distortion Current O DATE: 4/1112023 LOCATION: 3656 Kathryn Ave TYPE U) PROIECC Carver Ste Lighting --- UICBL-U4K-3-BLSPCU am LNC -51- LNC -71- 0 W LNC -91- With diffuser INSTALLATION • Quick mount adapter provides quick installation, designed for recessed box 4' squarejunction box ELECTRICAL • 60,000 hours minimum LED life at L96 rating per IESNA TM -21-11 • Minimum operating temperature is -40•C/ -40`F • 0-10V dimming 120-277V only • LNC5L-5 LEDs, Types II, III or N available, see page 2 for electrical details • LNC7L —7 LEDs, Type II, Ill or IV available, see page 2 for electrical details • LNC9L-9 LEDs, Types II, III or IV available, see page 2 for electrical details CONTROLS • Pholocontrol option is available to provide dusk -lo -dawn control for additional energy savings CERTIFICATIONS • Listed and labeled to UL 1598 for wet locations, 25•C ambient environments WARRANTY • 5year warranty KEY DATA Lumen Range 800-2100 Wattage Range 13-22 Efficaty Range (UPM 64-95 Mixture Projected! Life(Nours) L96>60K Weights lbs.(kg)9.6(24.5) ourrentlighdrg<om/exo PewtMa awoll UCUED -Il Sw TR FXO tuTe 4/142023 LOCATION: 3654 Kathryn Ave OUTDOOR LIGHTING TYPE UI PROJECT: Carver Site Lighting LNC CATALOG, LNC-9L-U-4K3-BLSPOU COMPACT LED LITEPAK ORDERING GUIDE EKAmplix LNC-5L-U-3K-2-BLPPCU CATALWY LNO?L-U-41(3-BL PCU ORDERING INFORMATION LNC - 9L - u LNC tNCZero BL 5LED5 U 1242ZN upli?rn n 7LEDs 1 tzw 9L ?LEGS 2 208V 3 2Z 4 2 N 41, W 3000Kmninel,7(ICRI 4K 40'.gK mninel.ACRI SK 5000Kwmina.7DCRl AM Amber(590 wna"S laderor DBT Dark Brmze Ndtte TIXWral •Turtle FrIeM y/ oheaLwary Lumens applkadonS,350mA Lumens (mnseultfiesery1' Wtem 1 ahter LIN has arallala Oa IL aN 9L ibaf,mlbn; 350m4 Frosted cacti shied, ImprmN uniland,widl any 5% real PERFORMANCE DATA �ea-m Typell Nominal Wa[tage BLT B18 Mage TOtadj Typall 51 4K(4000K NOMINAL TO CRD NOMINM-70CRI) Bi BIMkGIaS Snn h Typav Lumens DBT Dark Brmze Ndtte TIXWral LPW Lumens DBS Dark Brand GloS55natth Lumens 9y5tem WaltS GTT Seatte Matte Tatural 5 0.96 LGS Lgrn Gre/Gloss Smaotd 2 1,150 PSS Platlnum5ilva5mooth 81 883 WHIT Whie Malte Tebrod - - WHS While Gbss Smmth 3 1,132 VGT Verde GreenTi tul CC• Custom Cola 833 64 BLS PCU Univewi Bil pNwceii #Of LEDs Nominal Wa[tage System mm Dist Type 51 4K(4000K NOMINAL TO CRD NOMINM-70CRI) 3K(3000K NOMINAL SO CRD AM (l nm wavelength) Lumens LPW` Lumens LPW Lumens LPW Lumens 9y5tem WaltS LPW` 5 0.96 13W 2 1,150 88.5 1,052 81 883 68 - - - 3 1,132 87 1,077 83 833 64 - - - 4 1,146 88 1,053 81 849 65 - - - 7 STO, (7AM (350ll 17 2 11515 89 11369 80.5 1,272 75 - - - 3 1,500 88 1,539 90.5 1,392 82 268 6.6 59 4 1,557 91.5 1,535 90 1,425 84 - - - 9 22W 2 2,069 2,024 94 2,033 92 1,989 92 1,588 11 1,623 72 74 - - - - - - 3 1 90 4 2,095 95 2,059 1 93.5 1 1,680 76 382 83 46 Lum¢n ralI are rmm pnpDmeYlc tests pelarmed In—rtlpnce eat, IEiNA Lill Dere ISW be reprg lathy ea the Po,laip grs shoat. ACNgI pall.... may JlNer as a r It 0 enOu%r Bmironmente'd ephitisto" bases Ponsul[ I IS filg br BW rating. PROJECTED LUMEN MAINTENANCE AmbientOPERATING I, a 40Ia. at beeJ on al nwn 0LED tal par Ili LmbJOe NOUFS Current du1fandIg111hv` O IN, 2af3 Temperature 0 25,000 ,WO Tel L96 60.000 100,000 L70(tbthe) 2l /77F 1.00 0.97 0.97 0.96 0.95 >791,000 40-C/104°F 099 0.96 0.96 0.96 0.94 >635,000 Pmfecta" per I ii Till - DI retabi the ill e,sabtl porbrmanae psal IN the LNI base madel I, a 40Ia. at beeJ on al nwn 0LED tal par Ili LmbJOe Current du1fandIg111hv` O IN, 2af3 -mahbt,....eA .,.tm..4'ae,tu...,ul.,.t t -sed. ar.aMe. �o1/I1/ e Man ro&e N we. a.m .aylieu----e —say— n L. LEDBetlwlerlBM aF FXO OUTDOOR LIGHTING LNC COMPACT LED LITEPAK ELECTRICAL DATA DATE: V11I2023 LOCATION: 365t"thgm Ave TYPE: 3 PROJECT: Carver SHE Lighting I nTni —.. LNC9L-1.4K$BL&PC1j #OF Drive Currh1dputVoIWqe 0'C Oper.Cument StemPower LEDS (mA)(Amps) 1.01 20° C (W) 9 STD.(100m0050 71F Oil 13 12 STD.p00mCO]120 120 OM 11 12 STD.(700m 120 Ono 22 LUMINAIRE AMBIENT TEMPERATURE FACTOR (LATF) Ambient Temperature Lumen Multiplier 0'C 32'F 1.02 10°C 50'F 1.01 20° C 68° F 1.00 25°C 71F 1.00 30°C 86°F 1.00 40° C 104° F 0.99 50°C 122°F 1 098 USe r11ese hears to determine rela(Ne lumen oOrpN for average ambor,ttemperatures from 0 50°C (32122°F) PHOTOMETRY ■■■■■■ ■■■■■M ■■■M■■ ■E�■■■ DIMENSIONS A c ADDITIONAL INFORMATION SNIPPING INFORMATION A B C D 4.81' 1.55' 8.22' 5.25' (122 mm) (39 mm) (209 mm) (133 mm) USE OF TRADEMARKS AND TRADE NAMES All product and company names, logos and product identifies are tratlemarks" or registered trademarks 0 of Current or their respective owners. Use ofthem does not necessarily imply any affiliation with or endorsement by such respective owners. Currents WmentlIght(EIgGOL11,9,Lf1 aepe3m3 k CIPIn3 wnnrotieeuwe�z e.n�nrvpl+W°uvucxrenn�ea,ree�naumzMamvrc LNC LED Retlmren_ea Canon Dimensions Catalog G.w(kg}/ Carton Oty. per Numb¢r CTN Lenth Width Mdeter Pack) Inch(cm) Inch (cm) Inch(cm LNC-5LU 9b (436) 14.5(31) 96)245) 1 6d (175) 2 LNC-7LU 9b (436) 14.5(37) 9.6(24.5) 6.8(115) 2 LNC-9LU 9b (436) 14.5(37) 9.6(24.5) 6.8(115) 2 USE OF TRADEMARKS AND TRADE NAMES All product and company names, logos and product identifies are tratlemarks" or registered trademarks 0 of Current or their respective owners. Use ofthem does not necessarily imply any affiliation with or endorsement by such respective owners. Currents WmentlIght(EIgGOL11,9,Lf1 aepe3m3 k CIPIn3 wnnrotieeuwe�z e.n�nrvpl+W°uvucxrenn�ea,ree�naumzMamvrc LNC LED Retlmren_ea After recording, return to: Hershner Hooter, LLP 180 East 11th Avenue Eugene, Oregon 97401 Until a change is requested, mail all tax statements to: NO CHANGE Map 18-12-23-22 Tax Lots 6400 and 6401 PARTIES: Lane County Ciera 2022-049193 Lane County Deeds and Records IIIIIIIIRI11I1111IIIII1111IIIIII111111111 $122.00 02053958202200491930080087 12/13/2022 01:35:18 PM RPR -DEED Cnt=1 Pgs=B SIn=15 CASHIER 04 $40.00 $11.00 561.00 $10.00 PROPERTY LINE ADJUSTMENT DEED CARVER FAMILY, LLC, an Oregon limited liability company ("Carver Family') CARVER GROUP INVESTORS, LLC, an Oregon limited liability company ("Carver Group's CONSIDERATION: The true consideration for the conveyance is none. RECITALS: A. Carver Group is the owner of the real property described in Exhibit A, attached hereto and made a part hereof. As of the date of this instrument said real property is a portion of Tax Lot 6400 on Lane County, Oregon Assessor's Map 17-02-30-43-06400 ("Lot 7'7. Grantor's deed reference to the Parent Property is: Warranty Deed recorded on August 8, 2006, Instrument No. 2006-060155, in the Official Records of Lane County, Oregon. B. Carver Family is the owner of the real property described in Exhibit B, attached hereto and made a part hereof. As of the date of this instrument said real property is Tax Lot 6401 and a portion of Tax Lot 6400 on Lane County, Oregon Assessor's Map 17-02-30-43- 06400 ("Lot A"). Grantor's deed reference to the Parent Property is in the Warranty Deed recorded on -1-k:: �. w+( v _'Z , 2022, Instrument No. 2022- A'o l _3�, Lane County Oregon Official Records. C. Pursuant to ORS 92.190(4) and ORS 92.192, Carver Group and Carver Family desire to adjust the common property line between the Lot 7 and the Lot A. The adjustment of Page 1 — DECLARATION OF PROPERTY LINE ADJUSTMENT Property Line Adjustment Deed - Carver (0: Produced using RLID (www.rlid.org) on 12/142022 at 8:42 AM the common property line as provided herein has been approved on 0C,W bf2r- t9 , 2022 by the City of Springfield, Oregon pursuant to a Type I Property Line Adjustment, Case Number 811-22-000181-TYPI. PROPERTY LINE ADJUSTMENT: 1. CONVEYANCE BY GRANTOR. Carver Family, as the owner of Lot A, conveys and warrants to Carver Group that real property described as the area between the existing common boundary line and the newly adjusted boundary line, free of encumbrances except easements, covenants, conditions, restrictions, and public rights of way of record. This conveyance does not create a new lot or parcel, but is accomplished by an adjustment of the property line between Lot 7 and Lot A. 2. THE LEGAL DESCRIPTION OF LOT 7 after this adjustment is contained in Exhibit C, attached hereto and made a part hereof. 3. THE LEGAL DESCRIPTION OF LOT A after this adjustment is contained in Exhibit D, attached hereto and made a part hereof. 4. LIMITATION ON LIABILITY. The liability and obligations of Carver Family to Carver Group and Carver Group's successors and assigns under the warranties and covenants contained herein or provided by law shall be limited to the amount, nature, and terms of any title insurance cmr=ge available to Carver Family under any title insurance policy, and Carver Family shall have no liability or obligation except to the extent that reimbursement for such liability or obligation is available to Carver Family under any title insurance policy. The limitations contained herein expressly do not relieve Carver Family of any liability or obligations under this instrument, but merely define the scope, nature, and amount of such liability or obligations. 5. LEGAL NOTICE. BEFORE SIGNING OR ACCEPTING THIS INSTRUMENT, THE PERSON TRANSFERRING FEE TITLE SHOULD INQUIRE ABOUT THE PERSON'S RIGHTS, IF ANY, UNDER ORS 195.300, 195.301 AND 195.305 TO 195.336 AND SECTIONS 5 TO 11, CHAPTER 424, OREGON LAWS 2007, SECTIONS 2 TO 9 AND 17, CHAPTER 855, OREGON LAWS 2009, AND SECTIONS 2 TO 7, CHAPTER 8, OREGON LAWS 2010. THIS INSTRUMENT DOES NOT ALLOW USE OF THE PROPERTY DESCRIBED IN THIS INSTRUMENT IN VIOLATION OF APPLICABLE LAND USE LAWS AND REGULATIONS. BEFORE SIGNING OR ACCEPTING THIS INSTRUMENT, THE PERSON ACQUIRING FEE TITLE TO THE PROPERTY SHOULD CHECK WITH THE APPROPRIATE CITY OR COUNTY PLANNING DEPARTMENT TO VERIFY THAT THE UNIT OF LAND BEING TRANSFERRED IS A LAWFULLY ESTABLISHED LOT OR PARCEL, AS DEFINED IN ORS 92.010 OR 215.010, TO VERIFY THE APPROVED USES OF THE LOT OR PARCEL, TO DETERMINE ANY LIMITS ON LAWSUITS AGAINST FARMING OR FOREST PRACTICES, AS DEFINED IN ORS 30.930, AND TO INQUIRE ABOUT THE RIGHTS OF NEIGHBORING PROPERTY OWNERS, IF ANY, UNDER ORS Page 2 — DECLARATION OF PROPERTY LINE ADJUSTMENT Property Line Adjustment Deed - Carver (0: Produced using RLID (www.rlid.org) on 12/142022 at 8:42 AM 195.300, 195.301 AND 195.305 TO 195.336 AND SECTIONS 5 TO 11, CHAPTER 424, OREGON LAWS 2007, SECTIONS 2 TO 9 AND 17, CHAPTER 855, OREGON LAWS 2009, AND SECTIONS 2 TO 7, CHAPTER 8, OREGON LAWS 2010. DATED: 1),�c;clMN,Y.r , 2022. CARVER GROUP INVESTORS, LLC +em- WVER FAMILY, LLC or [NOTARY ACKNOWLEDGEMENT ATTACHED] Page 3 — DECLARATION OF PROPERTY LINE ADJUSTMENT Property Line Adjustment Deed - Carver (0: Produced using RLID (wwvd.rlid.org) on 12/142022 at 8:42 AM STATE OF C&K00(0 ) ) ss. COUNTY OF � OK;0 ) This instrument was acknowledged before me on Qt0eri'ther— 2 , 2022, by70"v member of Carver Group Investors, LLC, on behalf of the LLC. STATE OF Cd CW -6Y6 ) ) ss. COUNTY OF e( f' K0 ) Notary Public for or-0 My Commission Expires: '3/17/23— CAYL ENE NNNICUM Nn IARY PUFSLIG LSTATE OF COLORADO NOTARY ID 20214010BOB MY CoMkC�SSION FXFRES MARCH 17 2025 This instrument was acknowledged before me on p ectotYI%r p , 2022, by ;jOj 0I'member of Carver Family, LLC, on behalf of the LLC. Notary Public for cyorva/o My Commission Expires: Z;Z/25 LGAYL"JEiNNicuMULICTF OF COLORADOARY ID 20214 01 0808'G' H,SIRESt hRCH 17.2025 Page 4 — DECLARATION OF PROPERTY LINE ADJUSTMENT Property Line Adjustment Deed - Carver Produced using RLID (w rlid.org) on 12/142022 at 8:42 AM *anch ENGINEERING= �1m November 15, 2022 EXHIBIT A LEGAL DESCRIPTION PRE -ADJUSTMENT LOT 7 Branch Engineering Inc. Project No. 21-749 Lot 7, Block 7, First Addition to the Adams Plat, as platted and recorded in the Lane County Oregon Plat Records. EUGENE-SPRINGRFLD PHILOWTH 310 51^ Street, Springfield, OR 97477 1 p: 541.746.D637 I vn•+v.branchengineering.com Produced using RLID (w ..rlid.org) on 12/142022 at 8:42 AM Ianch ENGINEERING= m 197 November 15, 2022 EXMIT B LEGAL DESCREMON PRE -ADJUSTMENT LOT A Branch Engineering Inc. Project No. 21-749 Situated in the City of Springfield, Lane County, State of Oregon in the South Ye of Section 30, Township 17 South, Range 2 West, Willamette Meridian and described as follows: Being a portion of the lands conveyed in that Bargain and Sale Deed recorded on April 9, 2008 as Reception Number 2008-019771 and in that Warranty Deed recorded on August 18, 2006 as Reception Number 2006-060155, both in the Lane County Oregon Official Records, said portion being more particularly described as: Beginning at the Southwest corner of Lot 7, Block 7, First Addition to the Adams Plat, as platted and recorded in Volume 15, Page 2, Lane County Oregon Plat Records; thence North 0°33' East along the West line of said Block 7, 310.37 feet, thence South 89'27' East parallel with the South line of said Block 7, 701.75 feet; thence South 0°33' West parallel with said West line 310.37 feet to a point on the North line of Kathryn Street as dedicated by said plat; thence North 89'27' West along said North line 701.75 feet to the Point of Beginning, in Springfield, Lane County, Oregon. EXCEPT: Lots 4-7, Block 7, First Addition to the Adams Plat, as platted and recorded in the Lane County Oregon Plat Records. EUGENE-SMINCHOD PHIUOMAT 310 Sib Street, Springfield, OR 97477 1 p. 541.746.0637 1 www.branchenglneering.cont Produced using RLID (w ..rlid.org) on 12/142022 at 8:42 AM *anch E GINEERING- masn November 15, 2022 EXHO[BTT C LEGAL DESCREMON POST -ADJUSTMENT LOT 7 Branch Engineering Inc. Project No. 21-749 Situated in the City of Springfield, Lane County, State of Oregon in the South Y2 of Section 30, Township 17 South, Range 2 West, Willamette Meridian and described as follows: All that portion of the lands conveyed in that Bargain and Sale Deed recorded on April 9, 2008 as Reception Number 2008-019771 and in that Warranty Deed recorded on August 18, 2006 as Reception Number 2006-060155, both in the Lane County Oregon Official Records, lying westerly of a line parallel to and 262.85 feet easterly, by perpendicular measurement, of the easterly right-of-way margin of 3 S° Street. EXCEPT: Lots 4-6, Block 7, First Addition to the Adams Plat, as platted and recorded in the Lane County Oregon Plat Records. The bearings and distances herein are based on a Legal Lot Line Adjustment Survey which is to be filed in the Lane County Surveyor's Office. In the case of any discrepancy between the survey and the bearings and distances herein, said survey and the associated monuments shall control per ORS 93.310(6). REGISTERED PROFESSIONAL LAND SURVEYOR DIGITALLY SIGNED OREGON NOVEMBER 30, 2007 RENEE CLOUGH 69162LS EUGENE -SPRINGFIELD PHILOMATH 310 5t^ Street, Springfield, OR 97477 1 p. 541.746.0637 1 wR+c'.branchengineering.conn Produced using RLID (wwvd.rlid.org) on 12/142022 at 8:42 AM IIanch NEERING- m 197 November 15, 2022 EXMrf D LEGAL DESCRIPTION POST-AD,It1ST1i,1ENT LOT A Branch Engineering Inc. Project No. 21-749 Situated in the City of Springfield, Lane County, State of Oregon in the South Y2 of Section 30, Township 17 South, Range 2 West, Willamette Meridian and described as follows: All that portion of the lands conveyed in that Bargain and Sale Deed recorded on April 9, 2008 as Reception Number 2008-019771 and in that Warranty Deed recorded on August 18, 2006 as Reception Number 2006-060155, both in the Lane County Oregon Official Records, lying easterly of a line parallel to and 262.85 feet easterly, by perpendicular measurement, of the easterly right-of-way margin of 35'° Street. The bearings and distances herein are based on a Legal Lot Line Adjustment Survey which is to be filed in the Lane County Surveyor's Office. In the case of any discrepancy between the survey and the bearings and distances herein, said survey and the associated monuments shall control per ORS 93.310(6). REGISTERED PROFESSIONAL LAND SURVEYOR DIGITALLY SIGNED OREGON NOVEMBER 30, 2007 RENEECLOUGH 69162LS EUGENE-SPRINGFIal) MIMMATH 310 90 Street, Springfield, OR 97477 1 p: 541.746.0637 1 w .branchengineering.com Produced using RLID (wwvd.rlid.org) on 12/142022 at 8:42 AM Stormwater Management Plan and Drainage Study Carver Family, LLC Springfield, Oregon For Carver Family, LLC 112 Timson Drive Folsom, CA 95630 '�11 PR �NGINEF9 &79232PE Namara Pavcrson �JIG7TAILY SIGNED OREGON �9 ��`C 21, y6.S/Oj �qN PAT"�� EXPIRES: 12/31/24 September 1, 2023 ENGINEERING. -- Since 1977 civil - transportation structural geotechnical SURVEYING www.BranchEngineering.com Contents Page No. 1.0 Introduction............................................................................................................... 1 2.0 Existing Conditions.................................................................................................1 2.1 Topography 1 2.2 Soils 1 2.3 Existing Storm System 1 3.0 Proposed Development.........................................................................................2 4.0 Stormwater Constraints........................................................................................3 5.0 Proposed Development Stormwater Description.......................................3 6.0 Hydrologic and Hydraulic Analysis..................................................................4 6.1 Computer Model 4 6.2 Computer Model Data 4 7.0 Pre -Developed Runoff Rates...............................................................................5 8.0 Post -Developed Runoff Rates.............................................................................5 9.0 Maintenance...............................................................................................................5 10.0 Conclusion..................................................................................................................5 Appendices Description Appendix A Stormwater Management Drainage Basin Map Appendix B Site Soils and Map Appendix C HydroCAD Analysis Existing Site Analysis Post Development Analysis Appendix D Operation and Maintenance Plan O Branch FWneerft, Inc Stormwater Management Plan & Drainage Study - 3654 Kathryn Avenue September 1, 2023 1.0 INTRODUCTION This Stormwater Management Plan (SWMP) report has been prepared for a Site Plan Review application and construction permits to build an industrial warehouse development at the property currently known as 3654 Kathryn Avenue. The subject site is south of Olympic Street and east of 35- Street. The subject property is identified as Tax Map 17-02-30-43, Tax Lot 6401. The stormwater runoff from the roof drains and a portion of the drive surface will be directed to an existing stormwater drainage trench and a majority of the drive surface will be directed to a treatment swale. The purpose of this report is to document the design and establish maintenance requirements. 2.0 EXISTING CONDITIONS The subject site is located in Springfield, Oregon on the north side of Kathryn Avenue just east of 35m Street, and consists of 3.13 acres of private property. The development site includes the westerly and southerly 1.62 acres of the subject site and the drainage ditch located within an easement on the neighboring property to the west (Tax Lot 6400), which encompasses 0.14 acres (totaling 1.76 acres). Of the development site, 0.53 acres consist of existing improvements and 1.23 acres consist of pervious areas including existing stormwater drainage facilities 2.1 TOPOGRAPHY The subject site is underdeveloped with improvements on the easterly 1.76 acres. The developed portion has one main structure, which currently houses an automobile refurbishment and design facility, several storage containers, a 3,800 square foot tent, and associated parking and vehicle circulation area. The undeveloped portion is a grassy/brushy field with a drainage ditch on its southerly side that continues west through the neighboring property. The whole site is quite flat with slopes not exceeding 0.5%(except in existing stormwater facilities), and elevations ranging from 474.7 to 481.7 feet above sea level. 2.2 SOILS The Natural Resources Conservation Service (NRCS) Web Soil Survey maps the development site as containing only Malabon-Urban land complex (76). Malabon-Urban Land Complex is described as a well -drained silty and clayey alluvium and is in Hydrologic Soil Group C. A soils map and individual soil information is provided in Appendix B. i�dRl a/V F.`11 II ICCH.`Y CULL RY'(.`ll Y altL The western portion of the lot is open and vegetated with grass. This area has a private stormwater drainage facility along the southerly edge of the property that continues to the west through the neighboring property (Tax Lot 6400). The facility lies wholly within private property and terminates at the corner of Kathryn Avenue and 35- Street with a ditch inlet. This inlet connects directly into a public stormwater manhole within the 35- Street right-of-way. The facility is grassed, slopes at approximately 0.34%from east to west for 440 -feet, is about 2 -feet -deep with 3:1 (33%) side slopes, and is about 12 -feet -wide. The westerly 100 -feet of the facility widens to 18 -feet with a larger flat bottom. At the time the facility was originally constructed it was designed strictly for conveyance of stormwater for the improvements located on the eastern portion of the subject site. Brunch Engineering, Inc. Stormwater Management Plan & Drainage Study - 3654 Kathryn Avenue September 1, 2023 Currently, there is no stormwater infrastructure within the northerly half of the Kathryn Avenue right- of-way. All stormwater on the subject site is conveyed through the private stormwater drainage facility into the public main located in the 35- Street right-of-way. This public system consists of a 24 -inch pipe that conveys the water northward to the public main within the Olympic Street right-of-way. Per the City of Springfield Stormwater Basin Master Plan, the subject site is located in both Sub -Basin 9-265 and 9_266. Per the Development Initiation Meeting (811 -22 -000063 -PRE) there are no capacity issues within the public piped system downstream of the site. However, the northerly side of Kathryn Avenue has ponding water during the rainy season due to its lack of stormwater drainage facilities. 3.0 PROPOSED DEVELOPMENT The development site consists of four sub -basins; all of which are mapped on the attached basin map in Appendix A and listed as follows: 1) the stormwater drainage facility, 2) the westerly parking area and drive aisle, 3) the proposed building roof area, and 4) the easterly vehicular circulation and stormwater treatment area. A longer description of each is below BASIN 1: The stormwater drainage facility will be removed from the frontage of the subject site, but will remain within the property to the west (Tax Lot 6400). This will continue to convey the stormwater from the existing building and pavement located on the subject site to the east that are not part of this development. To achieve this, the existing culvert will be extended to the easterly end of the new stormwater drainage facility. The existing stormwater drainage facility will also convey all runoff from the development site as well. BASIN 2: The westerly parking area will include three (3) dual chambered catch basins with drop in filter inserts, as a form of mechanical treatment, that will capture and convey stormwater to Basin 1. This area constitutes 0.47 acres of pavement, which is 42.696 of the development site's non -roof impervious area. BASIN 3: The roof area of the development site will be directed to the stormwater pipes located in Basin 2. The roof area does not need to be treated per the City of Springfield's Engineering Design Standards and Procedures Manual. BASIN 4: The easterly vehicular circulation and stormwater treatment area consists of 2 separate areas each with their own characteristics as part of the development site 1. A portion of the area is composed of pervious landscaping with a centrally located stormwater treatment facility. The facility is a grassy swale designed to convey and treat all the stormwater from Basin 4 and direct it to Basin 1. 2. This area consists of new and existing impervious non -roof area that will be captured by the strip drains located at the base of the proposed truck wells. It should be noted that the building will have a roof overhang along its easterly side for hydraulic separation for at the base of the truck wells. All stormwater will be conveyed to the stormwater treatment facility located in Sub -Basin 4a. This area constitutes 0.64 acres of pavement, which is 57.4%of the development site's non -roof impervious area. Branch Engineering, Inc. Stormwater Management Plan & Drainage Study - 3654 Kathryn Avenue September 1, 2023 4.0 STORMWATER CONSTRAINTS Three significant constraints affect the site. One is the existing public infrastructure: elevation of the existing stormwater main located on 35'° Street, its relation to the existing stormwater flowlines on site, and the lack of a stormwater system located within the northerly half of Kathryn Avenue. The second is the flatness of the subject site. The third is the design requirements of the proposed structure. The existing stormwater main in 35m Street has a flowline approximately 5 feet below the asphalt surface. The existing outfall structure's flowline on the subject site is a little less than 4 feet above and approximately 480 feet east of the public stormwater main's flowline. All proposed stormwater systems must fall between these constraints, which limit the types of vegetated treatment that could be considered. City standards require this project to construct and install a public drainage ditch on the northerly side of the existing pavement on Kathryn Avenue. However, connection into the drainage ditch is not possible, as the flowline of the public drainage ditch is above the existing piped and treatment facility flowlines on site. Due to the subject site having an average slope of 0.596 falling from the northeast corner to the southwest corner, the slopes of the proposed stormwater system (pipes and swales) are limited between 0.296 and 0.596 for the main transmission lines. This constraint forces all pipes to be 12" if their grade is less than 0.596 in order to achieve cleansing velocity per chapter 13 of the ODOT Hydraulics Manual. The proposed structure having truck wells and ramps, along with a flush parking lot to the west required the building to be a certain elevation to prevent excessive grades leading from the street to the building entrance and still allow for the strip drains near the bottom of the truck wells to flow to the stormwater treatment facility without the need for a sump pump. 5.0 PROPOSED DEVELOPMENT STORMWATER DESCRIPTION The stormwater facilities will be designed to meet Chapter 3 of the City of Springfield's Engineering Design Standards and Procedures Manual for water quality. The proposed development consists of a swale located between the proposed building and the Kathryn Avenue right-of-way. The swale is only designed to convey and treat the non -roof impervious area in Basin 4 of the development site. It consists of a 90-foot4ong by 2 -foot -wide bottom with 3:1 (3396) side slopes. Per Chapter 4 of the City of Eugene Stormwater Management Manual, a set of design requirements must be met during the water quality design storm (0.83 inches / 24 hours, per the City of Springfield's Engineering Design Standards and Procedures Manual) to consider the swale as a treatment facility. The following is a list of those standards, and how the proposed stormwater treatment facility meets those standards. Description of Standard Design Swale Proposed Swale Max. flow depth 4 inches 3.0 inches Max. water velocity 0.9 feet per second 0.09 feet per second Min. hydraulic residence time 9 minutes 15.8 minutes Min. longitudinal slope 0.50% 0.23% Manning's Number (grassed) 0.25 0.25 Brunch Engineering, Inc. Stormwater Management Plan & Drainage Study - 3654 Kathryn Avenue September 1, 2023 The Proposed Swale meets or exceeds the Design Swale standards in all but the minimum longitudinal slope. This is due to the first of the described constraints in the Stormwater Constraints Section above. However, due to the other constraints and the soils on site, this option met more standards than any other facility type for treatment. 6.1 COMPUTER MODEL In preparing this Stormwater Management Plan for the project site, Branch Engineering utilized the HydroCAD 10.0 software. This is a computer program used to model, analyze and design hydrosystems of drainage basins. HydroCAD computes Santa Barbara Urban Hydrographs (SBUH) using rainfall data supplied by the designer. The SBUH method is a recognized analysis method by the City of Springfield and Oregon DEQ and is appropriate for a project site of this size. Once the appropriate data is input to HydroCAD, each drainage basin has a hydrograph and runoff flow for the desired storm event 6.2 COMPUTER MODEL DATA HydroCAD needs data supplied from the designer that describes the drainage basin in order to create the hydrograph. Below is the data that is needed to describe each drainage basin. . Storm Event For the purposes of this design, the design storm events are as follows: Water Quality Event 0.83 inches / 24 hours 2 -year Storm Event 3.30 inches / 24 hours 10 -year Storm Event 4.30 inches / 24 hours 25 -year Storm Event 4.80 inches / 24 hours o Impervious Area Pavement, sidewalks, hardscapes and rooftops are all impervious surfaces. Each drainage basin's impervious area was calculated using the proposed site plan. o Pervious Area Lawns and open space are pervious areas. Each drainage basin's pervious area is all that area that is not impervious. o Runoff Curve Numbers Each drainage basin has a Runoff Curve Number for the impervious areas and the pervious areas. The Runoff Curve Number is based on the type of surface and the Hydrologic Group of the soils. Table 2-2a of Urban Hydrology for Small Watersheds (commonly referred to as TR -55) has the curve number for impervious area as 98 and 89 for pervious. o Time of Concentration The time of concentration was estimated at 10 minutes for each sub basin, as each sub basin is less that one acre in size. For such a small area, this is a reasonable assumption Rrar6 Engineering, Inc. Stormwater Management Plan & Drainage Study - 3654 Kathryn Avenue September 1, 2023 7.0 PRE -DEVELOPED RUNOFF RATES As described in the existing stormwater system section above, the downstream system that the development site drains m has no capacityissues. This section and the next are here to provide clarity to the changes to the runoff rate from pre- to post -developments. The development site, as described in Section 2.0 above, has existing parking, vehicle circulation area, undeveloped land and a stormwater drainage facility all of which currently drain into the city storm system. Using HydroCAD stormwater modeling software, it has been determined that the existing conditions of the development site has peak pre -developed runoff rates of 0.79 cfs, 1.24 cfs, and 1.47 cfs during the 2 -year, 10 -year, and 25 -year design storms, respectively. See Subcatchment EC (Existing Conditions) in Appendix C for the HydroCAD results and the Pre - Developed Runoff Rate results. 8.0 POST -DEVELOPED RUNOFF RATES The proposed stormwater system, as described in Section 3 Proposed Development and Section 5 Proposed Development Stormwater Description, drains to the same point that the existing stormwater system currently drains to. Using HydroCAD stormwater modeling software, the table below shows the peak post -development runoff rates compared to the peak pre -developed runoff rates Design storm Peak Pre -developed Runoff Rates (cfs) Peak Post -developed Runoff Rates (cfs) Difference (cls) 2 -year 0.79 1.29 0.50 10 -year 1.24 1.71 0.47 25 -year 1.47 1.93 0.46 See Appendix C for the HydroCAD results of the post -developed runoff. 9.0 MAINTENANCE The facilities will be maintained privately since they receive water only from private improvements and will be constructed under a Building Permit. Maintenance will be per the City of Springfield's Stormwater Management Manual. Repairs to storm facilities shall be made in accordance with City of Springfield Public Works Department. Detailed Operations and Maintenance information is included in Appendix D. 10.0 CONCLUSION Compliance has been established for the stormwater system designed herein for the new site improvements. Water quality is accomplished through a grassy swale which treats 57.4% of the development site's non -roof impervious area and dual chambered catch basins with drop in filter inserts, as a form of mechanical treatment, will treat 42.696 of the development site's non -roof impervious area. The proposed runoff from the site does not need to meet pre -development flow rates as the existing conveyance system downstream has adequate capacity. Brunch Engineering, Inc. /_\»:1►191KV91 Stormwater Management Drainage Basin Map TABULATION OF COVERAGE anch INEEIII NG -- TABULATION OF COVERAGE ONLY INCLUDES THE LIMITS OF nowm DISTURBANCE. Enu . ":po,ono" DEVELOPMENT SITE `u """'"Quota """ ® r TM: 17-02-30-43, TL: 5401 SU RV EYI HG TOTAL SITE AREA 1.76 ACr. 0E EXISTING CONDITIONS ^".e. 30 ® — — IMPERVIOUS AREA arr.saraaaR PARKING AND CIRCULATION 0.53 AC PERVIOUS AREA 0 60 1.23 AC = PROPOSED CONDITIONS IMPERVIOUS AREA Is ,. ROOF, PARKING AND SIDEWALKS 1.51 AC PERVIOUS AREA 0.25 AC opi•n an. r ® moos INCREASE IN IMPERVIOUS AREA 0.98 AC —®— BASIN 1 • PRIVATE STORMWATER DRAINAGE FACILITY 0.14 AC BASIN 2 o * 'ma' _----_ WESTERLY PARKING AREA 0.47 AC —IEar— o BASIN 2 BUILDING ROOF AREA 0.41 AC -(E)so n."�.E" BASIN 4 .:..... .... ',; EASTERLY VEHICULAR CIRCULATION 0.63 AC .. STORMWATER TREATMENT FACILITY 0.11 AC v as F BASIN 3 U o 8 F — as a } ;'o— k BASIN 2 1 BASIN 4 J _u, m _ _ _ m z e O LL o Z O W ^=0 Q w 8 dass U m a 3L z s all sca,3 ---BASIN i—— y . .•..y w 9`eb, ear. ew aria* � q SERI 2023 a . S p I.-- 21109 STORMWATER BASIN MAP 1B Zg 3B 4B Basin 1 - tormwater Bas 2 - Westerly Drainag Facility arking Area asin 3 - Roof Area Basi 4 -Easterly Vehi lar Circulation a d Stormwater reatment Area 6R 5R Outfall Channel Stormwater Treatment Facility Routing Diagram for Concept 1 Subcat Reacb on Link Prepared by Branch Engineering, Printed 1/17/2023 HydroCAD® 10.00-20 s/n 10784 0 2017 HydroCAD Software Solutions LLC APPENDIX B Site Soils and Map = Sal Map—Lane County Area, Oregon ; (Carron Family, LLC - SMP) W R 9 9 9 9 0 9 I 6 � aa�xa"ry snmo sr� snsa snmo s>vm snvo sma soma stay saw a t Wpy le: 1:909RPnkdmAlmEsape(11"xes�tl 6. p N Nis a m m a m a -A a a m m zoo M�POJahn: WDM 3or CmrrmwtlYala:1W584 FAgeEa: NM]me10N 1W584 LiNatural Resources IM1Fb Sol Survey 5/23/2022 Conservation Serme Nalmal Cooperative S lSurvey Page 1 a3 Shc Map—Lane County Area, Oregon (Carver Family, LLC - SVMAP) _SD, Natural Resources Mill Sol Survey 5232D22 all Conservation Service National Cooperative Shc Survey Page 2 of 3 MAP LEGEND MAP INFORMATION Area at lmerasr tA09 Spot Area The sal surveys that comprise your AOI were mapped at Area of Interest(AOI) 1:20,090. Q Stany Spat Soils Vey Sony Spa Waming: Shc Map may not be vapid al Mrs scale. 0 Soil Map Unit Polygons 9 VJrf Spot p Enlargement of maps beyond the scale of mapping can cause ,.,. Soil Map Unic Lines misunderslantling of the tletail of mapping and accuracy of soil 4 Other line placement. The maps do not show the small areas of Soil Map Unit Points soils that could have been shown at a more detailed Special Line Feelcontrasting Special Point Features scale. Lg Blowout water Features Streams and Canals Please rely on the bar scale on each map sheet for map ® Boraw Pit measurements. Trenspartatian Clay Spot Rails Source of Map: Natural Resources Conservation Service 0 Closed Depression Web Soil SurveyLIRL: Interstate Highways Coordinate System: Mill Mercator(EPSG:3B5]) Graces Pit US Routes Maps from the Web Soil Survey are based on the Web Mercator Gravely Spa Malor Roads projection, which preserves and shape but schdistorts and area, projection that preserves area, such as the ion that ® Landfill Local Roads Abersdistance o Albers equal-area conic projection, should be used if more Lara Flaw accurate calculations of distance or area are req uired, Background aga Marsh or swamp . Aerial Photography This productis generated from the USDA­gRCS certified data as of Ne version dates) listed below. * Mine or Query SSurvey Area: Lane County Area, Oregon ® Miscellaneous Ydscer Suavely 21 y Area Data: Version 19, OctOc12T, 2021 ® Perennial VMmer Shc map units are labeled (as space allows) for map scales y, Rock Outcrop 1:50,ODD or larger. A Saline Spot Dates) aerial images were photographed: Jun 12, 20191 19, 2019 Sandy Spot The odhophoto or other base map on which the soil lines were Severely Eroded Spot compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor Sinkhole shifting ofmap and boundaries may be evident. �p Slide or Slip Sodic Spot _SD, Natural Resources Mill Sol Survey 5232D22 all Conservation Service National Cooperative Shc Survey Page 2 of 3 Sal Map�ane Connly Area, Oregon Map Unit Legend Carver Family, LLC - SMP LSIA Natural Resources Web Soil Survey 5/23/2022 iMi Conservation Serme National Cooperative Soil Survey Page 3 of3 Map Unit Symbd Map Unit Name Acres in AOI Percent of AOI 76 Malabori lrban land cornplex 2.0 100.0% Totals for Area of Interest 20 100.0% LSIA Natural Resources Web Soil Survey 5/23/2022 iMi Conservation Serme National Cooperative Soil Survey Page 3 of3 Map Unit Description: Malabon-Urban land complex --lane Cmnty Area, Oregon Carver Family, LLC - SMP Lane County Area, Oregon 76—Malabon-Urban land complex Map Unit Setting National map unit symbol. 238t Elevation. 300 to 650 feet Mean annual precipitation: 40 to 60 inches Mean annual air temperature: 52 to 54 degrees F Frost -free period. 165 to 210 days Farmland classification. Farm land of statewide importance Map Unit Composition Malabon and similar soils. 50 percent Urban land. 45 percent Estimates are based on observations, descriptions, and transects of the mapunit. Description of Malabon Setting Landform: Terraces Landform position (three-dimensional): Tread Down-slope shape: Linear Across -slope shape: Linear Parent material. Silty and clayey alluvium Typical profile H1 - 0 to 12 inches. silty clay loam H2 - 12 to 42 inches: silty clay H3 - 42 to 60 inches: clay loam Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class. Well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.57 inlhr) Depth to watertable: More than 80 inches Frequency of floodirg: None Frequency of ponding: None Available water supply, 0 to 60 inches. High (about 11.4 inches) Interpretive groups Lard capability classification (irrigated): 1 Lard capability classification (nonirrigated): 1 Hydrologic Sal Group: C Ecological site: R002XCOO6OR -Stream Terrace Group Forage suitability group: Well drained < 15% Slopes (G002XY002OR) Other vegetative classification. Well drained < 15% Slopes (G002XY002OR) LSM Natural Resources Wiab Soil Survey 5/23/2022 irk Conservation Serves National Cooperative Soil Survey Pagel oft Map Unit Desorption: Malabon-Urban land complex --lane County Area, Oregon Carver Family, LLC - SMP Hydric soil rating: No Description of Urban Land Interpretive groups Land capability classification (irrigated): None specified Lard capabildy classification (nonirrigated): 8 Hydric sal rating. No Data Source Information Soil Survey Area: Lane County Area, Oregon Survey Area Data: Version 19, Oct 27, 2021 LSM Natural Resources Mb Soil Survey 5/23/2022 211 Conservation Service National Cooperatirve Soil Survey Page 2 oft APPENDIX C HydroCAD Analysis Existing Site Analysis Post Development Analysis Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 1 Summary for Subcatchment EC: Existing Conditions Runoff = 0.79 cfs @ 8.03 hrs, Volume= 0.277 af, Depth= 1.69" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 2 yr Rainfall=3.30" Area (ac) CN Description * 1.230 74 Undeveloped area * 0.520 98 Existing Asphalt * 0.213 98 Existing Stormwater Drainage Facility 1.963 83 Weighted Average 1.230 62.66% Pervious Area 0.733 37.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 2 Summary for Subcatchment EC: Existing Conditions Runoff = 1.24 cfs @ 8.01 hrs, Volume= 0.417 af, Depth= 2.55" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 10 yr Rainfall=4.30" Area (ac) CN Description * 1.230 74 Undeveloped area * 0.520 98 Existing Asphalt * 0.213 98 Existing Stormwater Drainage Facility 1.963 83 Weighted Average 1.230 62.66% Pervious Area 0.733 37.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8/252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment EC: Existing Conditions Runoff = 1.47 cfs @ 8.01 hrs, Volume= 0.490 af, Depth= 2.99" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 25 yr Rainfall=4.80" Area (ac) CN Description * 1.230 74 Undeveloped area * 0.520 98 Existing Asphalt * 0.213 98 Existing Stormwater Drainage Facility 1.963 83 Weighted Average 1.230 62.66% Pervious Area 0.733 37.34% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr VVQ Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 4 Summary for Subcatchment 1B: Basin 1 - Stormwater Drainage Facility Runoff = 0.02 cfs @ 7.97 hrs, Volume= 0.007 af, Depth= 0.63" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (sf) CN Description * 5.986 98 Stormwater Drainaae Facilitv 5,986 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr VVQ Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 5 Summary for Subcatchment 2B: Basin 2 -Westerly Parking Area Runoff = 0.08 cfs @ 7.97 hrs, Volume= 0.025 af, Depth= 0.63" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (sf) CN Description 20.555 98 20,555 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr VVQ Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 6 Summary for Subcatchnr 3B: Basin 3 -Roof Area Runoff = 0.07 cfs @ 7.97 hrs, Volume= 0.021 af, Depth= 0.63" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (sf) CN Description 17.750 98 17,750 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 144Q Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 7 Summary for Subcatchment 4B: Basin 4 -Easterly Vehicular Circulation and Stormwater Treatment Ai Runoff = 0.07 cfs @ 8.03 hrs, Volume= 0.026 af, Depth= 0.42" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (sf) CN Description * 27,689 98 Easterly Vehicular Circulation and Stormwater Treatment Area * 800 98 swale 32,489 95 Weighted Average 4,000 12.3196 Pervious Area 28,489 87.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 144Q Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 8 Summary for Reach 5R: Stormwater Treatment Facility Inflow Area = 0.746 ac, 87.69% Impervious, Inflow Depth = 0.42" for WO event Inflow = 0.07 cfs 8.03 hrs, Volume= 0.026 of Outflow = 0.06 cfs 8.12 hrs, Volume= 0.026 af, Atten= 13%, Lag= 5.8 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 0.09 fps, Min. Travel Time= 15.8 min Avg. Velocity = 0.04 fps, Avg. Travel Time= 36.1 min Peak Storage= 61 cf @ 8.12 hrs Average Depth at Peak Storage= 0.25' Bank -Full Depth= 1.00' Flow Area= 5.0 sf, Capacity= 1.02 cfs 2.00' x 1.00' deep channel, n= 0.250 Side Slope Z -value= 3.0'f Top Width= 8.00' Length= 90.0' Slope= 0.0023 'f Inlet Invert= 475.97', Outlet Invert= 475.76' Carver Family, LLC Concept 1 Type IA 24 -hr IAKQ Rainfall=0.83" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 9 Summary for Reach 6R: Outfall Channel Inflow Area = 1.763 ac, 94.79% Impervious, Inflow Depth = 0.54" for WO event Inflow = 0.22 cfs 8.03 hrs, Volume= 0.079 of Outflow = 0.22 cfs 8.03 hrs, Volume= 0.079 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 11 Summary for Subcatchment 1B: Basin 1 - Stormwater Drainage Facility Runoff = 0.11 cfs @ 7.94 hrs, Volume= 0.035 af, Depth= 3.07' Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 2 yr Rainfall=3.30" Area (sf) CN Description * 5.986 98 Stormwater Drainaae Facilitv 5,986 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 12 Summary for Subcatchment 2B: Basin 2 -Westerly Parking Area Runoff = 0.37 cfs @ 7.94 hrs, Volume= 0.121 af, Depth= 3.07' Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 2 yr Rainfall=3.30" Area (sf) CN Description 20.555 98 20,555 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 13 Summary for Subcatchnr 3B: Basin 3 -Roof Area Runoff = 0.32 cfs @ 7.94 hrs, Volume= 0.104 af, Depth= 3.07' Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 2 yr Rainfall=3.30" Area (sf) CN Description 17.750 98 17,750 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 14 Summary for Subcatchment 4B: Basin 4 -Easterly Vehicular Circulation and Stormwater Treatment Ai Runoff = 0.53 cfs @ 7.97 hrs, Volume= 0.170 af, Depth= 2.74" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 2 yr Rainfall=3.30" Area (sf) CN Description * 27,689 98 Easterly Vehicular Circulation and Stormwater Treatment Area * 800 98 swale 32,489 95 Weighted Average 4,000 12.3196 Pervious Area 28,489 87.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 15 Summary for Reach 5R: Stormwater Treatment Facility Inflow Area = 0.746 ac, 87.69% Impervious, Inflow Depth = 2.74" for 2 yr event Inflow = 0.53 cfs 7.97 hrs, Volume= 0.170 of Outflow = 0.51 cfs 8.06 hrs, Volume= 0.170 af, Atten= 4%, Lag= 5.4 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs /2 Max. Velocity= 0.17 fps, Min. Travel Time= 8.8 min Avg. Velocity = 0.07 fps, Avg. Travel Time= 21.1 min Peak Storage= 270 cf @ 8.06 hrs Average Depth at Peak Storage= 0.72' Bank -Full Depth= 1.00' Flow Area= 5.0 sf, Capacity= 1.02 cfs 2.00' x 1.00' deep channel, n= 0.250 Side Slope Z -value= 3.0'f Top Width= 8.00' Length= 90.0' Slope= 0.0023 'f Inlet Invert= 475.97', Outlet Invert= 475.76' Carver Family, LLC Concept 1 Type IA 24 -hr 2 yr Rainfall=3.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 16 Summary for Reach 6R: Outfall Channel Inflow Area = 1.763 ac, 94.79% Impervious, Inflow Depth = 2.93" for 2 yr event Inflow = 1.29 cfs 8.01 hrs, Volume= 0.430 of Outflow = 1.29 cfs 8.01 hrs, Volume= 0.430 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 17 Summary for Subcatchment 1B: Basin 1 - Stormwater Drainage Facility Runoff = 0.14 cfs @ 7.94 hrs, Volume= 0.047 af, Depth= 4.06" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 10 yr Rainfall=4.30" Area (sf) CN Description * 5.986 98 Stormwater Drainaae Facilitv 5,986 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 18 Summary for Subcatchment 2B: Basin 2 -Westerly Parking Area Runoff = 0.48 cfs @ 7.94 hrs, Volume= 0.160 af, Depth= 4.06" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 10 yr Rainfall=4.30" Area (sf) CN Description 20.555 98 20,555 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 19 Summary for Subcatchnr 3B: Basin 3 -Roof Area Runoff = 0.41 cfs @ 7.94 hrs, Volume= 0.138 af, Depth= 4.06" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 10 yr Rainfall=4.30" Area (sf) CN Description 17.750 98 17,750 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 20 Summary for Subcatchment 4B: Basin 4 -Easterly Vehicular Circulation and Stormwater Treatment Ai Runoff = 0.72 cfs @ 7.95 hrs, Volume= 0.232 af, Depth= 3.73" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 10 yr Rainfall=4.30" Area (sf) CN Description * 27,689 98 Easterly Vehicular Circulation and Stormwater Treatment Area * 800 98 swale 32,489 95 Weighted Average 4,000 12.3196 Pervious Area 28,489 87.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 21 Summary for Reach 5R: Stormwater Treatment Facility Inflow Area = 0.746 ac, 87.69% Impervious, Inflow Depth = 3.73" for 10 yr event Inflow = 0.72 cfs 7.95 hrs, Volume= 0.232 of Outflow = 0.70 cfs 8.05 hrs, Volume= 0.232 af, Atten= 3%, Lag= 6.2 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 0.18 fps, Min. Travel Time= 8.1 min Avg. Velocity = 0.08 fps, Avg. Travel Time= 19.4 min Peak Storage= 338 cf @ 8.05 hrs Average Depth at Peak Storage= 0.83' Bank -Full Depth= 1.00' Flow Area= 5.0 sf, Capacity= 1.02 cfs 2.00' x 1.00' deep channel, n= 0.250 Side Slope Z -value= 3.0'f Top Width= 8.00' Length= 90.0' Slope= 0.0023 'f Inlet Invert= 475.97', Outlet Invert= 475.76' Carver Family, LLC Concept 1 Type IA 24 -hr 10 yr Rainfall=4.30" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Paae 22 Summary for Reach 6R: Outfall Channel Inflow Area = 1.763 ac, 94.79% Impervious, Inflow Depth = 3.92" for 10 yr event Inflow = 1.71 cfs 7.99 hrs, Volume= 0.576 of Outflow = 1.71 cfs 7.99 hrs, Volume= 0.576 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8/252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 23 Summary for Subcatchment 1B: Basin 1 - Stormwater Drainage Facility Runoff = 0.16 cfs @ 7.94 hrs, Volume= 0.052 af, Depth= 4.56" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 25 yr Rainfall=4.80" Area (sf) CN Description * 5.986 98 Stormwater Drainage Facilitv 5,986 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8/252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 24 Summary for Subcatchment 2B: Basin 2 -Westerly Parking Area Runoff = 0.54 cfs @ 7.94 hrs, Volume= 0.179 af, Depth= 4.56" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 25 yr Rainfall=4.80" Area (sf) CN Description 20.555 98 20,555 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 25 Summary for Subcatchnr 3B: Basin 3 -Roof Area Runoff = 0.46 cfs @ 7.94 hrs, Volume= 0.155 af, Depth= 4.56" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 25 yr Rainfall=4.80" Area (sf) CN Description 17.750 98 17,750 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 s/n 10784 © 2017 HydroCAD Software Solutions LLC Page 26 Summary for Subcatchment 4B: Basin 4 -Easterly Vehicular Circulation and Stormwater Treatment Ai Runoff = 0.81 cfs @ 7.95 hrs, Volume= 0.262 af, Depth= 4.22" Runoff by SCS TR -20 method, UH=SCS, Weighted -CN, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs Type IA 24 -hr 25 yr Rainfall=4.80" Area (sf) CN Description * 27,689 98 Easterly Vehicular Circulation and Stormwater Treatment Area * 800 98 swale 32,489 95 Weighted Average 4,000 12.3196 Pervious Area 28,489 87.69% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8/252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 27 Summary for Reach 5R: Stormwater Treatment Facility Inflow Area = 0.746 ac, 87.69% Impervious, Inflow Depth = 4.22" for 25 yr event Inflow = 0.81 cfs 7.95 hrs, Volume= 0.262 of Outflow = 0.79 cfs 8.05 hrs, Volume= 0.262 af, Atten= 3%, Lag= 6.2 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Max. Velocity= 0.19 fps, Min. Travel Time= 7.9 min Avg. Velocity = 0.08 fps, Avg. Travel Time= 18.7 min Peak Storage= 371 cf @ 8.05 hrs Average Depth at Peak Storage= 0.88' Bank -Full Depth= 1.00' Flow Area= 5.0 sf, Capacity= 1.02 cfs 2.00' x 1.00' deep channel, n= 0.250 Side Slope Z -value= 3.0'/ Top Width= 8.00' Length= 90.0' Slope= 0.0023'/ Inlet Invert= 475.97', Outlet Invert= 475.76' Carver Family, LLC Concept 1 Type IA 24 -hr 25 yr Rainfall=4.80" Prepared by Branch Engineering Printed 8252023 HydroCAD® 10.00-20 sln 10784 © 2017 HydroCAD Software Solutions LLC Page 28 Summary for Reach 6R: Outfall Channel Inflow Area = 1.763 ac, 94.79% Impervious, Inflow Depth = 4.42" for 25 yr event Inflow = 1.93 cfs 7.99 hrs, Volume= 0.649 of Outflow = 1.93 cfs 7.99 hrs, Volume= 0.649 af, Atten= 0%, Lag= 0.0 min Routing by Dyn-Scor-Ind method, Time Span= 0.00-36.00 hrs, dt= 0.01 hrs / 2 Operation and Maintenance Plan 4.5.10 Swale O & M Plan Swales are filtration stormwater conveyance facilities that provide flow control and stormwater quality benefits. Swales are long and narrow vegetated and grassed depressions used to collect and convey stormwater runoff which allows pollutants to settle and filter out as the water flows through the facility. All facility components, vegetation, and source controls shall be inspected for proper operations and structural stability, at a minimum, quarterly for the first 2 years from the date of installation, 2 times per year thereafter, and within 48 hours after each major storm event. Training and/or Written Guidance information for operating and maintaining Swales shall be provided to all property owners and tenants. A copy of the 0 & M Plan shall be provided to all property owners and tenants. Inspection Logs shall be kept by the facility owner demonstrating the following items have been inspected and are being maintained properly: • Access to Swales shall be safe and efficient. Obstacles preventing maintenance personnel and/or equipment access to the components of the facility shall be removed. • Channelization and causes for altered water flow shall be identified and corrected upon discovery. Stormwater should exit the vegetative filter as sheet flow, unless a collection drainpipe is used. • Debris and Litter shall be removed to prevent channelization, clogging, and interference with plant growth. Fallen leaves and debris from deciduous plant foliage shall be raked and removed. • Erosion Damage shall be identified and controlled when native soil is exposed or erosion channels are forming. • Grassed Swales shall be mowed to 4"-9" high and grass clippings shall be removed no less than 2 times per year. • Infiltrating Swales shall be excavated and cleaned, and gravel or soil shall be replaced to correct low infiltration rates. The Swale should drain within 48 hours of a storm event. • Wets shall maintain a calm flow of water entering the Swale and shall be cleared when conveyance capacity is plugged to ensure unrestricted stormwater flow to the rain garden. • Mulch shall be replenished as needed to ensure healthy plant growth. • Nuisance and Prohibited Vegetation from the Eugene Plant List (such as blackberries and English Ivy) shall be removed when discovered. Invasive vegetation contributing up to 25% of vegetation of all species shall be removed and replaced. • Outlets shall be cleared when 50% of the conveyance capacity is plugged. Stormwater Management Manual 425 Eugene 2014 Sedimentation build-up near or exceeding 2" in depth shall be hand -removed with minimum damage to vegetation using proper erosion control measures. Sediment shall be removed if it is more than 4 inches thick or so thick as to damage or kill vegetation. • Slopes shall be stabilized to prevent erosion and failure using appropriate measures when native soil is exposed. • Vegetation shall be healthy and dense enough to provide filtering while protecting underlying soils from erosion. Dead vegetation shall be removed to maintain less than 10% of area coverage or when vegetative filter function is impaired. Vegetation shall be replaced immediately to control erosion where soils are exposed and within 3 months to maintain cover density. Spill Prevention Measures shall be exercised on site when handling substances that contaminate stormwater. Releases of pollutants shall be corrected as soon as identified. Non -Chemical Pest Control measures shall be taken to prevent development of insects, mosquitoes, and rodents. Stormwater Management Manual 426 Eugene 2014