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Home My WebLink AboutApplication APPLICANT 6/3/2020City of Springfield Development & Public Works 225 Fifth Street Springfield, OR 97477 Land. Division Tentative Plan Partition, Subdivision SPRINGFIELD Partition Tentative Pre -Submittal: ❑ Subdivision Tentative Pre -Submittal: ❑ Partition Tentative Submittal: ❑ Subdivision Tentative Submittal: ❑ S Ip icant Name: Timothy Douglass - Phone: Com an Fax: Address: 2380 Mission Ave Eugene, OR 97403 Applicants Rep.: Jed _ Tr}�ett, Company: Metro Planning, Inc. Phone: 541-302-9830 Fax: Address: 846 A Street Springfield, OR 97477 Proerty Owner: same as applicant above Phone: _ Company: _ Fax: Address: ASSESSOR'S MAP NO:18-02-05-23 TAX LOT NO(S): 204 Property Address: Horace Street near Filbert Ln Size of Property: • 74 Acres ❑ Square Feet ❑ Pro Name of Subdivision: _osed Description of If you are filling in this form by hand, please attach your proposal description to this application. Proposal: divide property into five (5) lots Existing Use: vacant # of Lots/Parcels: 5 Total acreage of parcels/ allowable densit : Proposed # 10 Dwell Units Signatures: Please on and tint our name and date in the appropriate Associated Applications_ box on the next a e. Signs: Pre -Sub Case No.: Date: Reviewed by: Case Ni 11` 'OOO Oa' �. ��,!11 Date: b Ov� Reviewed by: Application Fee: $ �• 7' Technical Fee: $ tr"0'13 a Fee: $ TOTAL FEES: $ .'l5 PROJECT NUMBER:% %Posta ('j a' 0000 01S - Revised 117114 kl far 10 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. bmittal 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. /Z. Date: b Z— a nature nt 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 227.178 pertaining to a complete application. Owner: _Date: 6/X//,A13 gnature a v Print Revised 117114 hl 2 of 10 Land Division Tentative Application Process 1. Applicant Submits a Land Division Tentative Application for Pre -Submittal • The application must conform to the Land Division Tentative Submittal Requirements Checklist on pages 4-6 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 180 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 Land Division Tentative Submittal Requirements Checklist on pages 4-6 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 117114 n 3 of 10 Land Division Tentative 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. ® 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. ® Land Division Tentative 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. Density - list the size of property (acres), maximum allowable density and the density proposed. Copy of the Deed Copy of a Preliminary Title Report issued within the past 30 days documenting ownership and listing all encumbrances. ❑y Copy of the Land Division Plan Reduced to 81/2"x 11", which will be mailed as part of the required neighboring property notification packet. ❑ Right -of -Way Approach Permit Application provided where the property has frontage on an Oregon Department of Transportation (ODOT) facility. ® Three (3) Copies of the Stormwater Management System Study with Completed Stormwater Scoping Sheet Attached - The plan, supporting calculations, and documentation must be consistent with the Engineering Design Standards and Procedures Manual. ❑ Three (3) Copies of the Traffic Impact Study prepared by a Traffic Engineer in accordance with SDC 4.2-105 A.A. Traffic Impact Studies (TIS) allow the City to analyze and evaluate the traffic impacts and mitigation of a development on the City's transportation system. In general, a TIS must explain how the traffic from a given development affects the transportation system in terms of safety, traffic operations, access and mobility, and immediate and adjoining street systems. A TIS must also address, if needed, City, metro plan and state land use and transportation policies and objectives. ® Four (4) Copies of the Following Plan Sets for Pre -Submittal OR Three (3) Copies of the Following Plan Sets: ® 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. ® All plan sets must be folded to 81/2" by 11" and bound by rubber bands. a. Site Assessment of Existing Conditions W Prepared by an Oregon licensed Landscape Architect or Engineer Revised 117114 kl 4 d 10 ® Vicinity Map ® 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 and required setbacks from proposed property lines. XI 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 ® 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 Physical features including, but not limited to trees 5" in diameter or greater when measured 4 '/z feet above the ground, significant clusters of trees and shrubs, riparian areas, wetlands and rock outcroppings ® Soil types and water table information as mapped and specified in the Soils Survey of Lane County. 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 b. Land Division Tentative Plan ® Prepared by an Oregon licensed Land Surveyor ® City boundaries, the Urban Growth Boundary, and any special service district boundaries or railroad right-of-way which cross or abut the proposed land division ® Location and width of all existing and proposed easements on and abutting the proposed land division ® Boundaries of entire area owned by the property owner, of which the proposed land division is a part, as well as dimensions and size of each parcel and the approximate dimensions of each building site indicating the top and toe of cut and fill slopes to scale ® Location and type of existing and proposed street lighting, including type, height, and area of illumination ® Location, widths, conditions, and names of all existing and proposed streets, alleys, dedications or other right-of-ways within or adjacent to the proposed land division. Proposed streets should also include approximate radius of curves and grades and relationship to any projected streets as shown on the Metro Plan, Trans Plan, Conceptual Development Plan, or Conceptual Local Street Map. ® Location of existing and required traffic control devices, fire hydrants, power poles, transformers, neighborhood mailbox units and similar public facilities ® Location and dimensions of existing and proposed driveways KJ Location of existing and proposed transit facilities ® Location and width of all existing and proposed sidewalks, sidewalk ramps, pedestrian access ways and bike trails ® Location, size and type of plantings and street trees in any required planter strip Rev,,ed 117114 kl 5 of 10 [XI Location and size of existing and proposed 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 f The locations of all areas to be dedicated or reserved for public use, with the purpose, condition or limitations of the reservations clearly indicated ❑ Future Development Plan where phasing or large lots/parcels are proposed as specified in SDC 5.12-120 E. c. Stormwater Management Plan ® Prepared by an Oregon licensed Civil Engineer ® Planting plan prepared by an Oregon licensed Landscape Architect where plants are proposed as part of the stormwater management system ® Roof drainage patterns and discharge locations ® Pervious and impervious area drainage patterns [X_1 The size and location of stormwater management systems components, including but not limited to: drain lines, catch basins, dry wells and/or detention ponds; stormwater quality measures; and natural drainageways to be retained ® Existing and proposed spot elevations and contours lines drawn at 1 foot intervals (for land with a slope over 10 percent, the contour lines may be at 5 foot intervals) ® Amount of proposed cut and fill ❑ Additional Materials That May be Required 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: ❑ Proposed deed restrictions and a draft of any Homeowner's Association Agreement ❑ Additional plans and documentation for submittal of a Cluster Subdivision proposal as specified in SDC 3.2-230 ❑ 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 ❑ A Geotechnical Report prepared by an engineer must be submitted concurrently if there are unstable soils and/or a high water table present ❑ Where the development area is within an overlay district, address the additional standards of the overlay district ❑ If five or more trees are proposed to be removed, a Tree Felling Permit as specified in SDC 5.19-100 ❑ A wetland delineation approved by the Oregon Division of State Lands must be submitted concurrently where there is a wetland on the property ❑ Any required federal or state permit must be submitted concurrently or evidence the permit application has been submitted for review ❑ Where any grading, filling or excavating is proposed with the development, a Land and Drainage Alteration permit must be submitted prior to development Revised 1/7/19 kl 6 of 10 ❑ Where applicable, any Discretionary Use or Variance as specified in SDC 5.9-100 and 5.21-100 ❑ An Annexation 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 ❑ All public improvements proposed to be installed and to include the approximate time of installation and method of financing Revised 1/7/14 kI 7 of 10 PIZINGF I ELD " ,; i 225 FIFTH STREET DEVELOPMENT AND PUBLIC WORKS = oaecoR SPRINGFIELD, oR wan PHONE 541726.3153 FAX 517.136.1051 wine, nucif,,sc, Dov December 6, 2013 REQUIRED S I ORM WAI ER SCOPING SHEET USE POLICY: In October 2003, Springfield Public Works released a trial "stormwater scoping sheet," provided to help engineers and developers meet stormwater requirements in the Springfield Development Code (SDC) and Engineering Design Standards and Procedures Manual (EDSPM). After a five month trial period, it became apparent that users of the scoping sheet submitted much more complete applications than non-users. An added bonus was a decrease in the overall review time spent on the applications, resulting in quicker notice of decisions. As it result of the benefits of the seeping sheets, the City has decided to make their use a mandatory process. Current city policy is that the use of star scoping sheets is required for all applications which require development review. All applications submitted to the City shall provide a copy ofa completed stormwater scoping sheet with the application paekel. Attached with This letter Is the latest version of the scoping sheer, which reflects changes requested by the development community. PLEASE NOTE: SUBMITTED APPLICATIONS WILL NOW BE REQUIRED TO SUBMIT A COMPLF IED STORM WR'I'ER SCOPING SHEET, S ORM WATER STUDY AND PLANS IN CONFORMANCE WITH THE SCOPE REQUIREMENTS DIRECTIONS FOR USING S IORMWATF"R SCOPING SHEETS ARE AS FOLLOWS: 1.) Obtain scoping street from application packet, city websitc, or other location. 2.) Fill out project info'malion (top half of bout sheet) prior to commencement of work on sto'mwatcr study. (Note: Do not sign scoping sheet until it is received from the City with requirements checked.) 3.) Mail, fax, 01 email all pages to: City of Springfield, Development and Public Works Dept., Ann: Clayton McEachern. 4.) Receive completed scoping sheet (filled out by the City) indicating mininmm requirements for a complete stormwater study. 5.) Include four (4) copies of complete scoping sheet (signed by engineer at the bottom of page 2), stormwater Study and plans that comply with the minimum required scope with submittal of application packet. The scoping sheet shall be included as an attachment, inside Iheftont cover of the stormwater study. Stot'mwater scoping sheets can be found with all application packets' (City website and the DPW front counter) its well es ma the Engineering and CmacOvclion Resow'ees webpage located at: bun.//www.s�gllcid- aruovNPANdin ineeringandC.onsu'uetlgn Kcfourccs.hun under the Public Inpraverment Permi!Projecls Forms section. Thank you in advance for working with the City of Springfield with this new process. Sincerely, Clayton McEachern, PE City of Springfield. Development and Public Works Email emceaehernQa springfield-or.gov Phone: (541) 736— 1036 Fax: (54 1) 736-1021 kISN GF I ELD ^"':f 225 FIFTH S MEET DEVELOPMEIJ-i AND PUBLIC WORKS OREGON SPRINGER D.(DR 97477 PHONE 541 726 3753 FAX 541 726 1621 vnvv ,),ny(inld-crane STORMWATER MANAGEMENT SYSTEM SCOPE OF WORK ------- _--__(Area beta, No, lineQlAd ma hl Appli, anu — --__ _ (Please r'ehan to Claymn ® City a' Sic, ingfield Developnrcot and Pabl is Ule, kr, Pas # 736-1021, Phone # 736-103(), email..cmceachw'n(absVrrngfield-ocgov Project Name: Applicant: Assessors Parcel #: Date: Land Use(s): Phone #: Project Size (Acres): Fax #: Approx. Impervious Area: Email: Project Description (I aclude a copy of Assessor's snap): Drainage Proposal (Public connection(s), discharge location(s), etc. Attach additional sheet(s) if neeessaiy: Proposed Storruwater Hest Management Practices: -----------------(9'- hot '11''Ina, filhmf maI the Chur ond Rernrcdtu fire .4nnlicnnl)----- (At a nrinimom, all bores checked by the Ciry on rhe front and back ofthis sheet shall be submitted for an application (o be cony Mete fm subnrinal, althou h other r'ec uirernen(s eloy he necessor Drains e Study Tyne (FDSPM Section 4 03 21- Mote UI -1 any be substituted for Rational Method) ❑ Small Sito St a dy — (use Rational Method for cal cu lati ons) ❑ Mid -Level Development Study—(use Unit Hydrograph Mclhod for calculations) ❑ Full Drainage Development Study — (use Unil Hydrograph Method for calculations) Environmental Considerations: ❑ Wellhead Zone: ❑ Hillside Development: ❑ Wetland/Riparian: ❑ Floodway/Floodplain: ❑ Soil Type: ❑ other Jurisdictions Downstream Analysis: ❑ NM ❑ Flow line for starting water SUHUCe elevation: ❑ Design HGL to use for starting water surface elevation: ❑ Manhole/.function to take analysis to: Return to Clayton McEachern o City of Springfield, email: auceachem@epring(eld-or,gov, FAX: (541) 7364011 COMPLETE S'CUDY ITEMS aromaawrooam "' Bawd upon the infor n¢rliun prm'ided nn the font eflhis ,heel, the )ollon ing repreversls n nuninnun ofwhnl is neededfor an opplicano, to be cunpicte for.sub...atoll nviih, espect to drainages hmr ev er. this list shmdd not be used in hou pf1he S'pringfield Deue/apnrent Code (SDC) os the City's Engineering Design 44nmrol Compliance with these requirements does nor constitute site approval; Additional si« s'pecific !r joruralion may be r'equir'ed Nod, Upon scoping she,i ttubminai, ensu', cunpleted,fe nl has been signed in the space provided belmv: t ' D 'g St P ' 1 /AN t ' Q I'lV (PDS PA7 Chaple' 9) Reg'd N/A All non -building rooftop (NDR) impervious surfaces shall be pre-treated (e.g. multi-chambered catchbasin w/oil filtration media) for sonnivvaterquality. Additionally, aminimum 0150% of the NB Impervious surface shall be treated by vegetated methods. ❑ Where required, vegetative stormwater design shall be consistent with design standards (EDSPM Section 3.02), set forth in Chapter 2 of the Eugene Stw'mwator Management Manual. For new NDR impervious area less than 15,000 square feet, a simplified design approach may be followed as specified by the Eugene Stormwatm' Management Nlaneal (Sec2.4. 1). L] If a sfm'nvvvater treatment Swale is proposed, submit calculations/specifications fm'sizing, velocity, flow, side slopes, bottom slope, and seed nix consistent with City of Springfield or Eugene's Sloanweet Management Manuel, Water' Quality calculations as required in Section 3.03.1 ofthe EDSPM. ElAll building rooftop mounted equipment, or other fluid containing equipment located outside of the building, shall All vrovided with secondary containment or weather resistant enclosure. c �..,....t s —1 Ul .. i.r,n rnlc lrDCPM Vuvtinn 41131 �[_] ❑ Drainage study prepared by a Professional Civil Engineer licensed in the state of Oregon. ❑ A complete dm'mage study, as required in EDSPM Section 4.03.1, including a hydrological study map. C2lculations showing system capacity for a 2 -year storm event and overflow effects of a 25 -year storm event. The time of concenhalion (To) shall be determined using a 10 minute start time for developed basins. Review of Downstream System (PDSPM Section 4.03.4.Q A downstream drainage analysis as descrihed in EDSPM Section 4.03.4.0. Or -site drainage shall be governed by the Oregon Plumbing Specially Code (OPSC). Elevations ofthe I ICL and flow lines for both city and private systems where applicable. ❑ ❑ Design of Storm Systems (EDSPM Section 4.04). ❑ ❑ Plow Innes, slopes, 1'im elevations, pipe type and sizes clearly indicated on the plan set. Minimum pipe cover'still be 18 inches for reinforced pipeand 36 inches for plain concrete and plastic pipe materials, or proper engineering calculations shall be provided when less, The cover shall be sufficient to supportall 80,000Ili load without failure of the pipe structure. Meaning's "n" values for pipes shall be conslsteut with 'Iable 4-1 ofthe EDSP. All storm pipes shall be designed to —l'u,,, A,.eni... .... velnrhv nfrhrev f31 felt net second at 0.5 Once fill based on Table 4-1 as well. Existing and pmposcd contours, located at one foot interval. Include spot elevations and site grades showing how site drains. Private spa lr easements shall be clearly depicted on plans when private stormwater flows from one property to another. Drywells shall not receive runoff from any surface w/o being treated by one or more DMPs, with the exception of residential building roofs (EDSP Section 3.03.4.A). Additional provisions apply to this as required by the DEC. Neter to the website:h[l�.r',lhvsv3v.deq sm[cooI , oc, ne/u c. ill for mor'c infa'mation. ❑ Denta lion ponds shall be designed to limit ronoffto pre-developnrent rates for the through 25 -year storm events. 'This form ,rash/ he included ns an rrtrnchmeni, inside lite (rant coil ill the slornnvnler sludj. ^ N IP010 ,1 h"I'. ENGIA'EEIi PLEASE READ BL LOJV Ad ND .SIGA4 As the engineer of record, I hereby certify the above required items are complete and included with the submitted stormwater study and plan set. Signature Dale Fm'nv Version 5' Jun, 2015 846 A Street Springfield, OR 97477 Ph: (541)302-9830 metroplanning.com MEMORANDUM Date: June 3, 2020 To: City of Springfield Development Services Department 225 Fifth Street Springfield, OR 97477 Tel: 541-736-1003 From: Jed Truett, AICP, Principal Metro Maturing, Inc. 846 A Street Springfield, OR 97477 Tel: 541-302-9830 e-mail: ied@metroplanniny.com RE: Horace Subdivision Tentative Land Division Submittal application (811 -20 -000062 -PRE) This memo accompanies the Tentative Land Division Submittal application (811 -20- 000062 -PRE) for Horace Subdivision The following attachments are included with this memo: • Land Division Plat Submittal Fee • Land Division Plat Submittal application • Written Statement • Current Deed • Title Report • Land Division Tentative Plan B -1/2x11 (reduced, not to scale) • Three (3) Paper copies of Sourawater Management System Study • Three (3) Paper copies Land Division Tentative Plan • Three (3) paper copies A&O Engineering plans TENTATIVE SUBDIVISION APPLICATION FOR COAST HOMES "` a4 Document Date: June 3, 2020 Applicant's Request: Tentative Subdivision Plat approval to create 6 duplex lots DUSENNNNaANBrnIa MSEBMM Property Owner/ Applicant: Timothy Douglass 846 A STREET SPRINGFIELD, OREGON 9437 (341130Y--9030 Applicant's Representative/ Metro Planning, Inc. W Ww.METROPLANNING.00M Planner/Project Coordinator: c/o Jed Truett, AICP 846 A Street Springfield, OR 97477 Tel (541) 302-9830 Surveyor: EGR & Associates, Inc. c/o Ryan Erickson, PLS 2535 B Prairie Road Eugene, OR 97402 (Tal) 541-688-8322 Civil Engineer: A & O Engineering Go Scott Morris, PE 380 Q Street, Suite 200 Springfield, OR 97477 Tel(541)302-9830 Subject Property: Map I8-02-05-23; Tax Lots 00204 Site Address/ Location: Horace Street Total Property Size: 0.74 acres Zoning: MD- Medium Density Residential Metro Plan: M—Medimn Density Number of Lots Proposed: 5 Residential Lots Metro Planning, Inc. P a g e I I Background This is an application for a Tentative Subdivision on an approximately 0.74 acre site, located on the South side of Horace Street West of 4094 Horace Street. The site zoned as Medium Density Residential (MDR). The proposed subdivision will create five (5) residential lots, three (3) of which are proposed to be a flag lots. Trees on the site will be removed to accommodate the proposed development. A tree removal permit was submitted prior to the subdivision and will still apply and should have more context now that the subdivision has been submitted. To facilitate city staff review of this tentative subdivision application, this written statement clearly demonstrates how the development meets the requirements and criteria of SDC 5.12-120 Tentative Plan Submittal Requirements, and SDC 5.12-125 Tentative Plan Criteria. The Springfield Development Code (SDC) text sections are in bold and/or italics and the responses are included in plain text. Land Divisions: Tentative Plan - General SDC 5.12-115 Tentative Plan—General Any residendalland division shat/conform to the following standards: A. The kicparcel dimensions shall conform to the minimum standards of this Code. When 101s/parcels are more than double the minimum area permitted by the zoning district, the Director shall require that these lots/parcels be arranged 1. To allowre-division,• and 1. To allow for the extension ofstreets t0 serve future lots/parcels. 3 Placement ofstructum5 on the larger lots/parcels shall be subject to approval by the Director upon a determination that the potential maximum density of the larger labparcel is notrmpalred In order to make this determination, the Director may require a Future Development Plan as specified In Section 511120E As illustrated in Table 1. Lot Descriptions and Areas (see Appendix) Tax Lot 00204 is zoned MDR (Medium Density Residential) and designated M (Medium Density Residential) in the Metro Plan. The proposed lots conform to the minimum development standards required by SDC 3.2-215 and do not result in double the minimum area permitted. This standard has been met. H. Double frontage kils/parcels shall be avoided, unless necessaryt0 preventaccess to residential cieveldpment from collector and arterlal sacels or to overcome specific topographicsituations. The proposed subdivision will not result in the creation of double frontage parcels; this standard does not apply. C Panhandle lots/parcels shall comply with the standards specified in Sectlans 32-115 and 4.2-110A. In the case of multiple panhandles in Subdivisions, construction 0fnacessary udlih'es to serve all approved panhandle lots/parcels shall occur prior to recording the Plat. Lots 2, Lot 3 and 4 of the proposed subdivision are panhandle lots with 6,398 square feet, 7,321 square feet and 7,114 square feet respectively and have a twenty-six (26) foot wide joint access/ maintenance and utility easement as shown on the tentative plan. D. Block length forl0 alstmets is as specified in Section 4.1-115 Per SDC 4.2-115(B) "block length for local streets shall not exceed 600 feet' unless "buildings or other existing development on adjacent lands, including previously subdivided but vacant lots/parcels that physically preclude a block length 600 feet or less, considering the potential for redevelopment." The Metro Planning, Inc. P a g e 12 subject property has frontage on Horace Street. There is roughly 545 feet between Filbert Lane and the end of Horace Street. This is a pre-existing condition. Horace Street, adjacent to the site, will be less than six -hundred (600) feet in length. This standard has been met. Tentative Plan Submittal Requirements SDC 5.12-120 Tentative Plan Submittal Requirements A Tentative Plan application shall contain the elements necessary to demonstrate that the provisions of this Code are being fulfilled. A. Genera/Requirements 1. The Tentative Plan, including any required Future Development Plan, shall be prepared by an Oregon Licensed Land Surveyor on standard sheets of 18"x 24". The services of and Oregon registered Engineer may also be required by the City in order to resolve utility issues (especially stormwater management, street design and transportation issues), and site constraint and/or water quality issues. The tentative subdivision plan has been prepared by Ryan Erickson, PLS of EGR & Associates, Inc., an Oregon licensed land surveyor. 2. The scale of the Tentative Plan shall be appropriate to the area involved and the amount of detail and data, normally 1"= 50; 1"=100; or 1"= 200'. A scale, appropriate to the size of the development site and the amount of data needing to be shown, is included on the site plans. 3. A north arrow and the date the Tentative Plan was prepared. A north arrow and date are included on the tentative subdivision plan that is being submitted with this application. 4, The name and address of the owner, applicant, if different, and the Land Surveyor and/or Engineer who prepared the Subdivision Tentative Plan. The name and address of the property owner, applicant, project coordinator, surveyor, and engineer are noted on the plan. 5. A drawing of the boundaries of the entire area owned by the partitioner or subdivider of which the proposed land division is a part. A thicker, black line is drawn around the subject property to easily show Tax Lot 00204. 6. City boundaries, the Urban Growth Boundary (UGB) and any special service district boundaries or railroad right-of-way, which cross or abut the proposed land division. Metro Planning, Inc. P a g e 13 There are no special service district boundaries, city boundaries, or railroad right-of-ways that cross or abut the proposed subdivision. 7, Applicable zoning districts and the Metro plan designation of the proposed land division and of properties within 100 feet of the boundary of the subject property. Tax Lot 00204 is zoned MDR (Medium Density Residential) and designated M (Medium Density Residential) in the Metro Plan. All adjacent properties to the north, south, and east are also zoned medium density residential. 8. The dimensions (in feet) and size (either in square feet or acres) of each lot/parcel and the approximate dimensions of each building site, where applicable, and the top and toe of cut and fill slopes to scale. The proposed parcel sizes and dimensions are clearly labeled on the tentative subdivision plan drawing. 9. The location, outline to scale and present use of all existing structures to remain on the property after platting and their required setbacks from the proposed new property lines. There are no existing structures on site. 10. The location and size of existing and proposed utilities and necessary easements and dedications on and adjacent to the site, including but not limited to sanitary sewer mains, stormwater management systems, water mains, power, gas, telephone, and cable TV. Indicate the proposed connection points. The location and size of existing and proposed utilities are included in the attached drawing plan set. 11. The locations widths and purpose of all existing or proposed easements on and abutting the proposed land division; the location of any existing or proposed reserve strips. All existing and proposed easements are shown on the attached tentative subdivision plan drawing set. 12. The locations of all areas to be dedicated or reserved for public use, with the purpose, condition or limitations of the reservations clearly indicated. The locations of all areas to be dedicated or reserved for public use are labeled on the attached site plan. B. A Site Assessment of the Entire DeveropmentArea. The Site Assessment shall be prepared by an Oregon Licensed Landscape Architect or Engineer and drawn to scale with existing contours at 1 -foot intervals and percent of slope that precisely maps and delineates the areas described below. Proposed modifications to physical features shall be clearly indicated. The Director may waive portions of this requirement if there is a finding that the proposed development will not have an adverse impact on physical features or water quality, either on the site or adjacent to the site. Information required for Metro Planning, Inc. P a g e 14 adjacent properties maybe generalized to show the connections to physical features. ASite Assessment shall contain the following information. The attached Tentative Subdivision Plan drawing includes all the General Requirements, Site Assessment items, and Stormwater items. The plan was prepared and signed by Ryan Erickson, PLS, an Oregon licensed land surveyor, and Scott Morris, PE, an Oregon licensed civil engineer. 1. The name, location, dimensions, direction of flow and top of bank of all watercourses that are shown on the Water Quality Limited Watercourses (WLQW) Map on file in the Development Services Department; There are no watercourses shown on the Water Quality Limited Watercourses Map that encumber the subject property; thus this requirement is not applicable. 2. The 100 -year floodplain and floodway boundaries on the site, as specified in the latest adopted FEMA Flood Insurance Maps or FEMA approved Letter of Map Amendment or Letter of Map Revision; According to FEMA Flood Insurance Rate Map Number 41039C1162F, the subject site is located in Zone X, an area determined to be outside of the 500 -year floodplain. 3. The Time of Travel Zones, as specified in Section 3.3-200 and delineated on the Wellhead Protection Areas Map on file in the Development Service Department; According to the Wellhead Protection Map, the subject property falls outside the time of travel zones for wellhead protection. 4. Physical features including, but not limited to significant clusters of trees and shrubs, watercourses shown on the (WLQW) Map and their riparian areas, wetlands, and rock outcroppings; There are no watercourses, riparian areas, wetlands, or rock outcroppings located within the boundaries of the subject property. Types and diameters of trees on the site are shown on the existing and proposed condition plan. 5. Soil types and water table information as mapped and specified in the Soils Survey of Lane County, and According to the Soils Survey of Lane County, there is one soil type existing on the subject property: 100 percent Chapman -Urban land complex. Hydrologic Soil Group B and the depth to restrictive feature is more than 80 inches. No high water tables are known to exist on the subject property. Natural resource protection areas as specified in Section 4.3-117. Metro Planning, Inc. P a g e 15 There are no natural resource protection areas present on the subject property; thus this requirement is not applicable. C. A Stormwater Management plan drawn to scale with existing contours at l-footintervals and percentofslope thatpreciselymapsandaddresses the information describedbelow Inareaswhere the percent of slope is 10 percent or more, contours maybe shown at 5 -foot intervals. This plan shall show the stormwater management system for the entire development area. Unless exempt by the Public Works Director, the City shall require that an Oregon licensed Civil Engineer prepare the plan. Where plants are proposed as part of the stormwater management system, an Oregon Licensed Landscape Architect may also be required. The plan shall include the following components: 1. Roof drainage patterns and discharge locations; 1. Pervious and impervious area drainage patterns; 3. The size and location of stormwater management systems components, including but not limited to: drain lines, catch basins, dry wells and/or detention ponds; stormwater quality measures; and natural drainageways to be retained; 4. Existing and proposed site elevations, grades and contours; and 5. Astormwater management system plan with supporting calculations and documentation as required in Section 4.3-110 shall be submitted supporting the proposed system. The plan, calculations and documentation shall be consistent with the Engineering Designs Standards and Procedures Manual to allow staff to determine if the proposed stormwater management system will accomplish its purposes. A Stormwater and Utility Plan and stormwater Report, prepared by A&O Engineering, LLC is included in the tentative submittal as required. D. A Response to Transportation issues complying with the provisions of this Code. 1. The locations, condition, e.g., fully improved with curb, gutter and sidewalk, AC mat, or gravel, widths and names of all existing streets, alleys, or other rights-of-way within or adjacent to the proposed land division; Horace Street improvements are shown on the attached preliminary engineering plans. There is sufficient right of way present for future street improvements. 2. The locations, widths and names of all proposed streets and other rights -of --way to include the approximate radius of curves and grades. The relationship of all proposed streets to any projected streets as shown on the Metro Plan, including the TransPlan, any approved Conceptual Development Plan and the latest version of the Conceptual Local Street Map; Horace Street and its relative dimensions are shown on the attached plan set. 3. The locations and widths of all existing and proposed sidewalks, pedestrian trails and accessways, including the location, size and type of plantings and street trees in any required planter strip; Metro Planning, Inc. P a g e 16 Horace Street improvements are shown on the attached preliminary engineering plans. There is sufficient right of way present for future street improvements. 4. The location of existing and proposed traffic control devices, fire hydrants, power poles, transformers, neighborhood mailbox units and similar public facilities, where applicable; Where applicable, these items are shown on the proposed tentative subdivision plan set. The location and dimensions of existing and proposed driveways, where applicable, Access for driveways is proposed off of the shared panhandle drive, except that Lots 1 and 5 will access Horace Street directly. - 6. The location of existing and proposed street lighting: including the type, height and area of illumination; Existing street lights are shown on the attached drawing. No street lights are proposed. The location of existing and proposed transit facilities; There are no existing or proposed transit facilities adjacent, or within, the subject property. The nearest transit stop is on Main Street and 42nd Street. 8. A copy of a Right-of-way Approach Permit application where the property has frontage on an Oregon Department of Transportation (ODOT) facility; and The subject site is not adjacent to an ODOT facility. 9. A Traffic Impact Study prepared by a Traffic Engineer, where necessary, as specified in Section 4.2105A.4. Based on the Institute of Transportation Engineers (ITE) Trip Generation Manual, 7`^ Edition, the six (6) lot subdivision with one two-family dwellings on each lot results in an average rate of one hundred fourteen (114) trips per day, well under the 1,000 trips per day threshold requiring a Traffic Impact Study (TIS). E. A Future Development Plan. Where phasing and/or lots/parcels that are more than twice the minimum lot/parcel size are proposed, the Tentative Plan shall include a Future Development Plan that: There will be no remainder parcels more than twice the minimum lot size in the MDR zone exclusive of easements, and the project is proposed to be constructed in one phase. F. Additional information and/or applications required at the time of Tentative Plan application submitialshall include the following items, where applicable: Metro Planning, Inc. P a g e 17 1. A brief narrative explaining the purpose of the proposed land division and the existing use of the property; This written statement serves as a narrative explaining the purpose of the proposed subdividing and the existing use of the subject property. 2. If the applicant is not the property owner, written permission from the property owner is required; The attached application form has been signed by the property owner and applicant. 3. AVicinity Map drawn to scale showing bus stops, streets, driveways, pedestrian connections, fire hydrants and other transportation/fire access issues within 200 feet of the proposed land division and all existing Partitions or Subdivisions immediately adjacent to the proposed land division; A vicinity map is shown on the Tentative Subdivision Plan sheet. How the Tentative Plan addresses the standards of any applicable overlay district; No overlay districts apply to the subject property. 5. How the Tentative Plan addresses Discretionary Use criteria, where applicable; The entirety of the subject site is zoned Medium -Density Residential (MDR). The proposed two-family residential development within the MDR zone is a permitted use according to SDC 3.2-210. No Discretionary Use Permit is required. 6. ATree Felling Permit as specified in Section 5.19-100; Tree felling permit has been submitted concurrently with/prior to this subdivision application. 7. A Geotechnical Report for slopes of 15 percent or greater and as specified in Section 3.3- 500, and/or if the required Site Assessment in Section 5.12-120B. indicates the proposed development area has unstable soils and/or high water table as specified in the Soils Survey of Lane County; There are no slopes greater than 15% on this site and according to the Soils Survey of Lane County the soil is composed Chapman -Urban land complex with a low water table; therefore no geotechnical report is necessary or required. 8. An Annexation application as specified in Section 5.7-100 where a development is proposed outside of the city limits but within City's urban growth boundary and can be serviced by sanitary sewer; Metro Planning, Inc. P a g e 18 The subject property is located within the city limits; thus no annexation application is necessary. 9. A wetland delineation approved by the Department of State Lands shall be submitted concurrently where there is a wetland on the property; There are no existing wetlands on the subject site; thus this requirement is not applicable. 10. Evidence that any required Federal or State permit has been applied for or approved shall be submitted concurrently; No federal or state permits are required with this tentative subdivision application; thus this requirement is not applicable. 11. All public improvements proposed to be installed and to include the approximate time of installation and method of financing; The applicant will construct this subdivision in 2020. Financing of the infrastructure will likely come from private sources. 12. Proposed deed restrictions and a draft of a Homeowner's Association Agreement, where appropriate, No deed restrictions or Homeowner's Association are proposed at this juncture; thus this requirement is not applicable. 13. Cluster Subdivisions shall also address the design standards specified in Section 3.2-230; This application is for a tentative subdivision and not a cluster subdivision; thus this requirement is not applicable. 14. Where the Subdivision of a manufactured dwelling park or mobile home park is proposed, the Director may waive certain submittal requirements specified in Subsections A. through M. However, the Tentative Plan shall address the applicable standards listed under the park Subdivision approval criteria specified in Section 5.12-125. (6286; 6211) This application is not for the subdivision of a manufactured dwelling park. Tentative Plan Criteria SDC 5.12-125 Tentative Plan Criteria A. The request conforms to the provisions of this Code pertaining to lot/parcel size and dimensions. Metro Planning, Inc. P a g e 19 As illustrated in Table 1. Lot Descriptions and Areas (see Appendix) Tax Lot 00204 is zoned MDR (Medium Density Residential). The proposed subdivision abuts Horace Street, an east/west street. As shown in the table below, the five (5) lot subdivision is proposed to be developed with two-family detached housing on Lots 1-5 that will conform to the minimum development standards required by SDC 3.2-215 and do not result in double the minimum area permitted. Lot 1 and Lot 5 are standard lots developed with a duplex located in an area zoned MDR. Per SDC 3.2- 215 east/west streets require a minimum of 4,500 square feet of area and 45 feet of frontage and north/south streets require a minimum of 5,000 square feet of area with 60 feet of frontage. Lot 1 proposed to have 5,214 square feet of area, and ninety three (93) feet of frontage, meeting the minimum lot area and frontage. Lot 5 proposed to have 6,003 square feet of area, and ninety four (94) feet of frontage, meeting the minimum lot area and frontage. Lot 2, Lot 3, and Lot 4 are proposed panhandle lots for two-family dwelling development. Per SDC 3.2- 215 panhandle lot in both the MDR zones require a minimum of 4,500 square feet of area in the pan portion. Lot 2 meets the minimum lot area standard with approximately 6,000 square feet, 8.67 feet of frontage on Horace Street. Lot 3 meets the minimum lot area standard with approximately 6200 square feet, 8.67 feet of frontage on Horace Street. Lot 4 meets the minimum lot area standard with approximately 6,000 square feet, 8.67 feet of frontage on Horace Street. In addition a twenty-six (26) foot wide joint access/ maintenance and utility easement will be dedicated as illustrated on the proposed layout site plan. B. The zoning is consistent with the Metro Plan diagram and/or applicable Refinement Plan diagram, Plan District map, and Conceptual Development Plan. The Metro Plan diagram clearly shows Tax Lot 00204 designated medium density residential, which is consistent with the existing MDR (Medium Density Residential) zoning district. There are no refinement plans applicable to the subject site. C. Capacity requirements of public and private facilities, including but not limited to, water and electricity; sanitary sewer and storm water management facilities; and streets and traffic safety controls shall not be exceeded and the public improvements shall be available to serve the site at the time of development, unless otherwise provided for by this Code and other applicable regulations. The Public Works Director or a utility provider shall determine capacity issues. Public and private utilities are shown on the attached preliminary subdivision drawing plan set. D. The proposed land division shall comply with all applicable public and private design and construction standards contained in this Code and other applicable regulations. All of the existing public and private facilities meet the design and construction standards of the SDC. Proposed public facilities will meet the design and construction standards of the SDC and Springfield TSP. In addition, the future private utilities will be constructed according to all applicable SDC and other regulations. This approval criterion will be satisfied. Metro Planning, Inc. P a g e 1 10 E. Physical features, including, but not limited to: steep slopes with unstable soil or geologic conditions; areas with susceptibility of flooding; significant clusters of trees and shrubs, watercourses shown on the WQLW Map and their associated riparian areas; other riparian areas and wetlands specified in Section 4.3-117,• rock outcroppings; open spaces; and areas of historic and/or archaeological significance, as may be specified in Section 3.3-900 or ORS 97.740-760, 358.905-955 and 390.235-240, shall be protected as specified in this Code or in State or Federal law. The subject property is relatively flat with no unstable soil. This development site is located outside of the 100 -year floodplain. There are no significant clusters of trees, watercourses, riparian areas, wetlands, rock outcroppings, or other historically / archaeological significant features within the boundaries of the proposed partition. As illustrated on the site plan set there are a number of trees that exist on the subject property that will be removed to accommodate the proposed development. Per SDC 5.19-100, a tree felling permit will be submitted as required as a condition of approval. Based on these facts, this criterion will be satisfied. F. Parking areas and ingress -egress points have been designed to: facilitate vehicular traffic, bicycle and pedestrian safety to avoid congestion, provide connectivity within the development area and to adjacent residential areas, transit stops, neighborhood activity centers, and commercial, industrial and public areas; minimize driveways on arterial and collector streets as specified in this Code or other applicable regulations and comply with the ODOT access management standards for State highways. The single shared driveway will be designed to facilitate vehicular traffic, bicycle and pedestrian safety and to avoid congestion. Lots 1 and 5 will have individual driveways coming off of Horace Street. This approval criterion will be satisfied. G. Development of any remainder of the property under the same ownership can be accomplished as specified in this Code. The entire subject property is owned by Timothy Ryan Douglass, Robert John Douglass and Hannah Michelle Douglass. There are no adjacent lands owned by this property owner within the UGB. Based on this fact, there will be no remainder of the subject site under the same ownership that could be further divided or developed in the future. This approval criterion is satisfied. H. Adjacent land can be developed or is provided access that will allow its development as specified in this Code. Most of the adjacent land has already been developed. Those properties that haven't maintain direct access onto Horace Street and will be unimpacted by this proposed subdivision, 1. Where the Partition of property that is outside of the city limits but within the City's urbanizable area and no concurrent annexation application is submitted, the standards specified below shall also apply. 1. The minimum area for the partitioning of land in the OF -10 Overlay District shall be 10 acres. EXCEPTIONS: Metro Planning, Inc. P a g e 111 a. Any proposed new parcel between 5 and 10 acres shall require a Future Development Plan as specified in Section 5.12-120E. for ultimate development with urban densities as required in this Code. b. In addition to the standards of Subsection 2.a., above, any proposed new parcel that is less than 5 acres shall meet 1 of the following standards: I. The property to be partitioned shall be owned or operated by a governmental agency or public utility; or fl. A majority of parcels located within 100 feet of the property to be partitioned shall be smaller than 5 acres. iii. No more than 3 parcels shall be created from 1 tract of land while the property remains within the OF -10 Overlay District. EXCEPTION: Land within the UF10Overlay District may be partitioned more than once as long as no proposed parcel is less than 5 acres in size. The subject property is located within the city limits; thus this approval criterion is not applicable to this tentative partition application. J. Where the Subdivision of a manufactured dwelling pork or mobile home park is proposed, the following approval criteria apply: 1. The park was approved before July 2, 2001 and is in compliance with the standards in Section 3.2-235 or other land use regulations in effect at the time the site was approved as a manufactured dwelling park or mobile home park; or the park is an approved non -conforming use. In the latter case, a park is in compliance if the City has not issued a notice of noncompliance on or before July 2, 2001. 2. The number of lots proposed shall be the some or less than the number of mobile home spaces previously approved or legally existing in the park. 3. The external boundary or setbacks of the park shall not be changed. 4. The use of lots, as shown on the Tentative Plan, shall be limited to the installation of manufactured dwellings; i.e., "stick -built" houses are prohibited. 5. Any other area in the Subdivision other than the proposed lots shall be used as common property, unless park streets have previously been dedicated to the City or there are public utilities in the park. All common property shall be addressed in a Homeowner's Association Agreement. a. Areas that are used for vehicle circulation (streets), driveways that serve more than 2 lots/parcels or common parking areas, shall be shown in a Tract or easement on the Tentative Plan. b. All other services and utilities that serve more than 1 lot shall be in a Tract or easement. Where a service or utility serves only 1 lot, but crosses another, that service or utility shall also be in an easement shown on the Tentative Plan. C. Existing buildings in the park used for recreational, meetings or other purposes for the park residents shall be in a Tract shown on the Tentative Plan. 6. Any public utilities shall be within a public utility easement. Metro Planning, Inc. P a g e 1 12 7. If public utilities or services are required to serve the Subdivision, the park owner shall sign and execute a waiver of the right to remonstrate against the formation of a local improvement district to provide the public utilities or services. The subject application is for a tentative subdivision, but is not a subdivision of a manufactured dwelling park/mobile home park; thus this approval criterion is not applicable. This tentative subdivision application clearly meets the application requirements (per the checklist and Springfield Development Code) and the approval criteria; thus the applicant respectfully requests that the Current Planning Manager approve the application. If there are any questions or concerns, please do not hesitate to contact me at Metro Planning via email (ied(lo metroolannine.com) or phone (541- 302-9830). Regards, Jed Truett, Principal Metro Planning, Inc. P a g e 1 13 Appendix Table 1. Lot Descriptions and Areas Metro Planning, Inc. P a g e 1 14 Min. Frontage Zoning/ Metro Required Lot (feet) Plan Duplex Panhandle Lot Area (sq. Area Designation Orientation Lot Lot ft.) (sq. ft.) Lot Medium Horace Street: 5,000 5,214 93.07 1 Density East/West Yes No Lot Medium 5,000 6,398 8.67 2 Density Panhandle Lot Yes Yes Lot Medium 5,000 7,321 8.67 3 Density Panhandle Lot Yes Yes Lot Medium 5,000 7,114 8.67 4 Density Panhandle Lot Yes Yes Lot Medium Horace Street: 5,000 6,003 93.76 5 Density East/West Yes No Metro Planning, Inc. P a g e 1 14 A & O Engineering LLC Civil Engineering & Site Planning Drainage Memorandum Prepared By. Lucas Does, EIT Reviewed By. Scott Monis, PE Scott Morris, ug,bryr iu yned by so MOFF' Date: 5/27/2020 PE Date. 2020.0n 27 ns zs moo Re: Rain Garden Design Horace St Subdivision, Springfield, Oregon Overview This storm analysis is for a tentative subdivision application for a property located on Horace Street in Springfield, Oregon. The proposed 0.74 -acre development includes 5 lots with a 20' wide shared driveway. The shared driveway is proposed to sheet drain stormwater to a rain garden adjacent to the shared driveway on the west side. The roof drainage from lots 1-5 are proposed to be directed to individual soakage trenches on each property. The main outlet of the rain garden is infiltration with overflow for the 25 -year event being directed to the existing 24" storm line in Horace Street. The rain garden will provide some level of detention as well as filtration for the water quality storm event before stormwater enters the public drainage system in 21 fi' Street right-of-way. Site Soils Per the Web soil survey, the site soils are classified as Chapman -Urban Land Complex (#25). The soil is characterized as hydrologic soil group B with moderate drainage. The soil has the best anticipated infiltration rates of 0.06-2.0 in/hr, The depth to the water table is >80 inches. The site is within the 5 -year time of travel wellhead zone and requires that the rain garden have at least 18" of growing media for stormwater entering ground. Storm Design The rain garden is designed to process drainage from the shared driveway only. The rain garden is designed as an infiltration and flow control facility. The primary outlet is infiltration with an assumed infiltration rate of 1.0 in/hr per Web Soil Survey. A 4" overflow is designed to convey stormwater overflow for larger storm events (25 -year) to the existing system within Horace St. For the purposes of this study an infiltration rate through growing media was conservatively assumed to be 2.0 in/hr. Individual soakage trenches for each lot roof area are proposed. These soakage trenches are designed with an assumed infiltration rate of 1.0 Whir and a depth of 4.5'. Impervious area was calculated using half of each lot size. The exact sizing will be determined during the building permit phase when field infiltration rates and roof sizes are known. The rain garden dimensions were designed with the following variables: Drainage Area Impervious Area (sq - ft) CN Shared Driveway 2,823 2,607 98 Lot 1 _ 98 Lot 2 3,047 3,047 98___ 98 _ Lot 3 _ Lot 4 3,002 98 Lot 5 3,092 98 Water quality Storm = 0.83 inches in 24 hours 2 -Year Design storm = 3.3 inches in 24 hours The analysis was completed utilizing HydroCAD software, the Santa Barbara Urban Hydrograph runoff method. The calculation sheets are attached, and the analysis results outlined below: The rain garden is designed to have 18 inches of growing medium and soakage trenches to have 4.5' rock chamber. Top eottorn Max Water Drewtlown Elevation Elevation Elevation Time - of of during for Surface Area Side Chamber Chamber design Facility (Sq -ft) slope (ft) (ft) storm (ft) (Hours) in Garden 242 3'1 486,00 484.00 485.77 25.2 Rock Chernber 180 0 48.5 4805 483.69 30 Lot 1 Rock -- — Chamber 220 0 485 480.5 483.53 30 Lot 2 _ Rock Chamber 220 0 485 480.5 483.53 30 Lot 3 Rod< Chamber 220 0 485 480.5 483.46 30 Lot 4 Rock Chamber 220 0 485 480.5 '483.46 30 Lot 5 The rain garden is designed to have 18 inches of growing medium and soakage trenches to have 4.5' rock chamber. Drivewav Areas on Site Stormwater from the shared driveway will be graded to flow into the adjacent rain garden where it will receive treatment. The first 500 square feet of the shared drive and driveways from lots 1 & 5 is graded to sheet drain back toward the street where it will enter a catch basin on Horace Street. Conclusion For the storm events analyzed, the rain garden and individual soakage trenches are adequately sized to fully infiltrate through the 2 -year storm event. In the rain garden, the 25 - year storm event will overflow through a 4" standpipe and be directed to the existing 24" trunk line in Horace Street. The analysis shows the rain garden and soakage trenches are adequately sized for the water quality storm event, with a drawdown time that meets code. Attachments 1. HydroCAD Calculations (Ti � A 555 2P Lott Soakage Trench Lot Soakage Trench 52S _ D OP 54S>-- D 3P Lott Soakage Trench Lot Soakage Trench 5 SS 4P 465) 47S r Lot 3 Soakage Trench Shared u,rive Area Ex Conditions v 44 , Rain Gardent $u5i§at RBaGh A `Lwk. Routing Diagram for Horace Storm Calcs Prepared by Olson A Morris, Printed 5/21/2020 Hydm'AD� 10D(F25 Wn U4993 ® 2019 Hydn GAD Suflwam, SolW0ns LLC Designed By: LAB Horace Storm Gales Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADV 10.00-25 s/n 04993 @2019 HydroCAD Software Solutions LLC Page 2 Summary for Subcatchment 46S: Shared Drive Area Runoff = 0.05 cfs @ 7.98 hrs, Volume= 0.017 of, Depth= 3.07" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0,00-32.00 hrs, dt= 0,05 hrs Type IA 24 -hr 2 -Year Rainfall=3.30" Area (so CN Description 2,823 98 Paved parking HSC C 2,823 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ftlit) (Msec) (cfs) 10.0 Direct Entry, Subcatchment 46S: Shared Drive Area Hydrograph 0.045 . 0.04 0.035_ N � 0.03- 0.025, _o a 0.02- M15 0.01 0.005 Type IA 24 -hr _.2 -Year Rainfall 3.30"_ Runoff Area=2,823 sf Runoff Volume=0.017 of Runoff Depth=3.07' Tc=10.0 min CN=0/98 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADr010.00-25 s/n 04993 @2019 HydroCAD Software Solutions LLC Page 3 Summary for Subcatchment 47S: Ex Conditions Runoff = 0,02 cfs @ 6.01 Inns, Volume= 0.007 af, Depth= 1.41" Runoff by SBUI-I method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr 2 -Year Rainfall=3.30' Area (at) CN Description 2,560 79 50-75% Grass cover, Fair, HSG C 2,560 79 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (H/sec) (cfs) 10.0 Direct Entry, 0.018 0.016- 0.014- 0.012- 0 01 .016:0.014=0.012-001 3 LL 0.008 0.002 Subcatchment 47S: Ex Conditions Hydrograph Type IA 24 -hr 2 -Year Rainfall=3.30" Runoff Area=2,560 sf Runoff Volume=0.007 of - Runoff Depth=1.41" Tc=10.0 min CN=79/0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfa11=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADG910.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LI -C Pace 4 Summary for Subcatchment SOS: Lot 1 Runoff = 0.04 cfs @ 7.98 hrs, Volume= 0.015 af, Depth= 3.07' Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr 2 -Year Rainfall=3.30" 2,607 98 Unconnected roofs HSG C 2,607 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) lots) 0.045' 0.04- 0.035-- 0.03- 0.025-- 0.02- 0.0151 .040.0350.030.025-0.020.015 0.01 Direct Entry, Subcatchment SOS: Lot 1 Hydrograph 0.04 cfS Type IA 24 -hr 2 -Year Rainfall=3.30" Runoff Area=2,607 9f Runoff Volume=0.015 of Runoff Depth=3.07"_ Tc=10.0 min CN=0/98 0 n4. 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD@ 10.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Pace 5 Summary for Subcatchment 52S: Lot 2 Runoff = 0.05 cfs @ 7.98 hrs, Volume= 0.018 at Depth= 3.07" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 bra Type IA 24 -hr 2 -Year Rainfall=3.30" 3,047 98 Unconnected roofs, HSG C. 3,047 98 100.00% Impervious Arca To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, Subcatchment 52S: Lot 2 Hydrograph 0.055: 0.05 cfs —Runoff 0.05 Type IA 24 -.hr 0.045 2 -Year Rainfall --3.-30" 0.04 Runoff Area=3,047 sf 0.035 Runoff Volume=0.018 of 0.03- - - - - - - - - - Runoff Depth=3.07" - 0 0.025- - Tc=10.0 min LL CN=0198 0.02 0.015 0.01= 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: I AB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADO 10.00-25 s/n 04993 020191 IydroCAD Software Solutions LLC Pane 6 Summary for Subcatchment 535: Lot 3 Runoff = 0.05 cfs @ 7.98 hrs, Volume= 0.018 of, Depth= 3.07" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, d1= 0.05 hrs Type IA 24 -hr 2 -Year Rainfall=3.30" Area (so CN Description - 3,047 98 Unconnected roofs, HSG C 3,047 98 100.00% Impervious Area - To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fusee) (cfs) 10.0 Direct Entry, Subcatchment 53S: Lot 3 Hydrograph 0.055 M H 0.035 0.03 0 0.025 LL 0.02 <iIrliR Type IA 24 -hr 2 -Year Rainfall=3..30" Runoff Area=3,047 sf Runoff Volume=0.018 of Runoff Depth=3.07" Tc=10.0 min CN=0/98 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) —Runoff Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 Hyd oCAD® 10.00-25 s/n 04993 © 2019 1 IydroCAD Software Solutions LLC Page 7 Summary for Subcatchment 54S: Lot 4 Runoff = 0.05 cfs @ 7.98 hrs, Volume= 0.018 af, Depth= 3.07" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 ms, dt= 0.05 hrs Type IA 24 -hr 2 -Year Rainfall=3.30" 3,002 98 Unconnected roofs HSG C 3,002 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (fl/ft) (ff/sec) (cfs) 10.0 Direct Entry, Subcatchment 54S: Lot 4 Hydrograph 0.055 0.05 cfs —Runoff n ng 0.035 0.03 o 0.025 LL 0.02 0.015 ` 0.01 0 2 Type IA 24 -hr 2 -Year Rainfall=3.30" Runoff Area=3,002 sf Runoff Volume=0.018 of Runoff Depth=3,07" Tc=10.0 min CN=0/98 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Cales Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD6 10 00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 8 Summary for Subcatchment 55S: Lot 5 Runoff = 0.05 cfs @ 7.98 hrs, Volume= 0.018 af, Depth= 3.07" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 ms, dt= 0.05 bra Type IA 24 -hr 2 -Year Rainfall=3.30" 3 002 98 Unconnected roofs, HSG C 3,002 98 100.00% Impervious Area To Length Slope Velocity Capacity Description (min) (feet) (grit) (R/sec) (cfs) L! ^y U.UJ 0.0 6 0.02 U- 0.0 0.01 Direct Entry, Subcatchment 55S: Lot 5 Hydrograph Type IA 24 -hr 2 -Year Rainfall=3.30" Runoff Area=3,002 sf Runoff Volume=0.018 of Runoff Depth=3.07'' Tc=10.0 min CN=0198 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) —Runoff Designed By. LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADO 10.00-25 s1n 04993 @ 2019 HydroCAD Software Solutions LLL' Page 9 Summary for Pond 44P: Rain Gardenl Inflow Area = 0.065 ac,100.00% Impervious, Inflow Depth = 3.07" for 2 -Year event Inflow = 0.05 cfs @ 7.98 hrs, Volume= 0.017 of Outflow = 0.02 cfs @ 8.68 hrs, Volume= 0.017 af, Atten= 58%, Lag= 42.4 min Primary = 0.02 cfs @ 8.68 hrs, Volume= 0.017 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Peak Elev= 485.77' @ 8.68 hrs SurEArea= 854 at Storage= 102 cif Flood Elev= 486.00' SurEArea= 955 at Storage= 171 cf Plug -Flow detention time= 46.6 min calculated for 0.017 of (100% of inflow) Center -of -Mass det. time= 46.3 min ( 716.9 - 670.6 ) Volume Invert Avail Storage Storage Description #1 485.50' 120 cf 2.00'W x 67.001 x 0.50'H Open Storage Z=3.0 #2 484.00' 50 cf 2.00'W x 46.001 x 1.50'H Growing Media Z=3.0 503 cf Overall x 10.0% Voids 171 cf Total Available Storage Device Routing Invert Outlet Devices #1 Device 2 484.01' 2.000 in/hr Exfiltration(Growing Media) over Surface area from 484.01' - 485.4 Excluded Surface area = 95 at #2 Primary 484.00' 1.000 inlhr Exfiltration over Surface area #3 Secondary 485.83' 4.0" Horiz. Overflow C= 0.600 1_imited to weir flow at low heads Primary OutFlow Max -0.02 cfs @ 8.68 hrs HW=485.77' (Ree Discharge) L2=Exfiltration (Exfiltration Controls 0.02 cfs) L1=Exfiltration(Growing Media) (Passes 0.02 cfs of 0.02 cfs potential flow) Secondary OutFlow Max -0.00 cfs @ 0.00 hrs HW=484.00' (Free Discharge) 3=Overflow ( Controls 0.00 cfs) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 I- IydroCAr)010.00-25 sln 04993 © 2019 HydfoCAD Software Solutions LLC Pane 10 1 II 0 3 0.( 0 �9 Pond 44P: Rain Gardenl Hydrograph 0.05 cfs — Inflow Inflow Area=0.065 ac Outflow — Primary PeakElev=485.77 —Secondary Storage -102- cf 0.02 cfs 0.01: 0.01 0.00 cfs r- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainf611=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD(010.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 11 Summary for Pond 56P: Soakage Trench Inflow Area = 0.060 ac, 100.00% Impervious, Inflow Depth = 3.07" for 2 -Year event Inflow = 0.04 cfs @ 7.98 hrs, Volume= 0.015 of Outflow = 0.01 cfs @ 11.44 hrs, Volume= 0.015 af, Allen= 819%, Lag= 207.7 min Discarded = 0.01 cfs @ 11.44 hrs, Volume= 0.015 at Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 -hrs Peak Elev= 483.69' @ 11.44 hrs Surf.Area= 0.004 ac Storage= 0.005 of Flood Elev= 485.00' .S'urf.Area= 0.004 ac Storage= 0.007 of Plug -Flow detention time= 290.1 min calculated for 0.015 of (100% of inflow) Center -of -Mass det. time= 290.2 ruin ( 960.8 - 670.6 ) Volume Invert Avail.Storage Storage Description #1 480.50' 0.007 of 10.00'W x 18.00'L x 4.50'H Rock Chamber 0.019 of Overall x 35.01% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 11.44 hrs HW=483.69' (Free Discharge) 1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 56P: Soakage Trench Hydrograph 0.04 cfs 0045- 045JL7 0.04:c 0.04- 9' 0.035 of 0.030.025u. 0.020.015 0.01 0-005 0 2 4 6 8 10 12 14 16 18 20. 22 24 26 28 30 32 Time (hours) —Inflow — Discarded Designed By: LAB Horace Storm Cales Type IA 24 -hr 2 -Year Rainfal1=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCADNI 10.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 12 Summary for Pond 70P: Soakage Trench Inflow Area = 0.070 ac,100.00% Impervious, Inflow Depth = 3.07" for 2 -Year event Inflow = 0.05 chs @ 7.98 hrs, Volume= 0.018 of Outflow = 0.01 cfs @ 11.50 hrs, Volume= 0.018 af, Allen= 81% Lag= 211.4 min Discarded = 0.01 cfs @ 11.50 hrs, Volume= 0.018 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, di 0.05 hrs Peak Elev= 483.53' @ 11.50 hrs Surf.Area= 0.005 ac Storage= 0.005 of Flood Elev= 485.00' Surf.Area= 0.005 ac. Storage= 0.008 of Plug -Flow detention time= 288.6 min calculated for 0.018 of (100% of inflow Center -of -Mass det. time= 288.6 min ( 959.2 - 670.6 ) Volume Invert Avail.Slorage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 11.50 hrs HW=483.53' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) N u.835 0.03-: 0 0.025 LL 0.02. 0-015 0.01 0.005 Pond 70P: Soakage Trench Hydrograph Inflow Area=0.070 ac Peak Elev=483.53' Storage=0.005 of 0 h,r., n 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Inflow — Discarded 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24-hr 2-Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 1-IydroCAD4910.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Page 13 Summary for Pond 72P: Soakage Trench Inflow Area = 0.069 ac,100.00% Impervious, Inflow Depth = 3.07" for 2-Year event Inflow = 0.05 cfs @ 7.98 hrs, Volume= 0.018 of Outflow 0.01 cfs @ 11.48 hrs, Volume= 0.018 af, Atten= 819/, Lag= 210.2 min Discarded = 0.01 eta @ 11.48 hrs, Volume= 0.018 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 ms Peak Elev= 483,46' @ 11.48 hrs SurCArea= 0.005 ac Storage= 0.005 at Flood Elev= 485.00' SurCArea= 0.005 ac Storage= 0.008 of Plug-Flow detention time= 284.0 min calculated for 0.018 of (100% of inflow) Center-of-Mass det. time= 284.0 min ( 954.6 - 670.6 ) Volume Invert Avail.Storage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0'7 Voids Device Routing Invert Outlet Devices 41 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 11.48 hrs I IW=483.46' (Free Discharge) t1=Exfiltration (Exflltration Controls 0.01 cfs) Pond 72P: Soakage Trench Hydrograph 0.0550.05 cfs — Inflow 0.05: — Discarded Inflow Area=0.069 ac 0.045 Peak Elev=483.46' 0.04 Storage=0.005 of 0.035 0 03 _ 0 0.025- LL O.02- 0 015 0.01 cfs 0.01 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfal1=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCAND 10.00-25 s/n 04993 @ 2019 HydroCAD Software Solutions LLC Page 14 Summary for Pond 73P: Soakage Trench Inflow Area = 0.069 ac,100.00% Impervious, Inflow Depth= 3.07" for 2 -Year event Inflow 0.05 cfs @ 7.98 hrs, Volume= 0.018 of Outflow 0.01 cfs @ 11.48 hrs, Volume= 0.018 af, Allen= 81%, Lag= 210.2 min Discarded = 0.01 cfs @ 11.48 hrs, Volume= 0.018 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= O.05 hrs Peak Elev= 483.46' @ 11.48 hrs Surf.Area= 0.005 ac Storage= 0.005 of Flood Elev= 485.00' Surf.Area= 0.005 ac Storage= 0.008 of Plug -Flow detention time= 284.0 min calculated for 0.018 of (100% of inflow) Center -of -Mass del. time= 284.0 min ( 954.6 - (370.6 ) Volume Invert Avail.Storage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x35.0%Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max -0.01 chs @ 11.48 hrs HW=483.46' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.01 cfs) 0.055 0.05 0.045 0.04 m 0.035 0.03 o 0.025 LL Pond 73P: Soakage Trench Hydrograph — Inflow Inflow Area=0.069 ac ® Discarded Peak Elev=483.46' Storage=0.005 of 0.015 0.01 cfs 0-01 0.005 0' 0 2 4 6 8 101 2 14 16 18 20 22 24 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr 2 -Year Rainfall=3.30" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD0 10.00-25 sm 04993 ©2019 HydroCAD Software Solutions LLC Page 15 Summary for Pond 74P: Soakage Trench Inflow Area 0.070 ac,100.00%Impervious, Inflow Depth= 3.07" for 2 -Year event Inflow = 0.05 cfs @ 7.98 ms, Volume- 0.018 of Outflow = 0.01 cis @ 11.50 hrs, Volume= 0.018 af, Atten= 81%, Lag= 211.4 min Discarded = 0.01 cfs @ 11.50 hrs, Volume= 0.018 of Routing by StarIndmethod, Time Span= 0.00-32,00 his, dt= 0.05-hrs Peak Elev= 483.53' @ 11.50 hrs Surf.Area= 0.005 ac Storage= 0.005 of Flood Elev= 485.00' Surf.Area= 0.005 ac Storage= 0.008 of Plug -Flow detention time= 288.6 min calculated for 0.018 of (100% of inflow) Center -of -Mass det. time= 288.6 min ( 959.2 070.6 ) Volume Invert Avail.Storage Slomae Descrintion #1 480.50' Device Routing 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0''/b Voids Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 11.50 hrs HW=483.53' (Free, Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 74P: Soakage Trench Hydrograph 0.055 0.05 cf_s — Inflow 0.05: '- Discarded Inflow Area=0.070 ac 0.045- __ Peak Elev=483,53' 0.04 Storage=0.005 of 0.035. 0.03 0 0.025 u 0.02 0.015 0.01 cfs 0.01 0.005 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WO Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 I-lydroCADO 10.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Page 16 Summary for Subcatchment 46S: Shared Drive Area Runoff = 0.01 cfs @ 7.98 hrs, Volume- 0.003 at Depth= 0.63" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (so CN Description 2,823 98 Paved parking, HSG C 2,823 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (f/sec) (cfs) 10.0 Direct Entry, 0.011 0.01 0.009 0.008 N 0.007 0.006 0 0.005 LL 0.004 0.003 0.002 0.001 Subcatchment 46S: Shared Drive Area Hydrograph 0.01 cfs TypeIA 24 -hr WQ Rainfall=0.83" Runoff Area=2,823 sf Runoff Volume=0.003 of Runoff Depth=0.63 Tc=10.0 min CN=0/98 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) —Runoff Designed By: LAR Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCADV 10.00-25 s/n 04993 (,)2019 HydroCAD Software Solutions LLC Page 17 Summary for Subcatchment 47S: Ex Conditions Runoff = 0.00 cfs @ 21.46 ms, Volume= 0.000 of, Depth= 0.03" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 ms, dl= 0.05 hrs Type IA 24 -hr WQ Rainfal1=0.83" 2,560 79 50-75°% Grass cover, Fair, HSG C 2,560 79 100.00% Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fusee) (cfs) 10.0 Direct Entry, Subcatchment 47S: Ex Conditions Hydrograph 0.000 0.00 Cfs 0.000" Type IA 24 -hr 0,000 f WQ Rainfall=0,83" 0.000' Runoff Area=2,560 sf u 0.000: Runoff Volume=0.000 of Runoff Depth=0.03" 3: 0.000: Tc=10.0 min a 0'- CN=79/0 0- 0 0 00 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) — Runoff Designed ray: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCA0010.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Page 18 Summary for Subcatchment 50S: Lot 1 Runoff = 0.01 cfs @ 7.98 hrs, Volume= 0.003 of, Depth= 0.63" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr WQ Rainfall=0.83" 2,607 98 Unconnected roofs HSG C 2,607 98 100.00% Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (M/sec) (cfs) 10.0 Direct Entry, 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) —Runoff Subcatchment 50S: Lot 1 Hydrograph 0.01: 0.01 cfs 0.009- TypelA 24 -.hr 0.008. —-WQRainfall=0.83" 0.007 --- - - - RunoffArea=2,607sf Runoff Volume=0.003af 0.006E Runoff Depth=0.63" 3 0.005-, Tc=10.0 min 0 FL 0.004. CN=0/98 0.003 0.002 0.001 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) —Runoff Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfal1=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydfoCADV 10.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Pace 19 Summary for Subcatchment 52S: Lot 2 Runoff = 0.01 cfs @ 7.98 ms, Volume= 0.004 af, Depth= CST' Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 ms Type IA 24 -hr WQ Rainfall=0.83" 3,047 98 Unconnected roofs, HSC C 3,047 98 100.00% Impervious Area To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fVsec) (efs) 1 0 012- 0.011 0.01 Direct Entry, Subcatchment 52S: Lot 2 Hydrograph 0.01 cfs Type IA 24 -hr WQ Rainfall=0.83"_ Runoff Area=3,047 sf Runoff Volume=0.004 of Runoff Depth=0.83" Tc=10.0 min CN=0/98 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) 0.009, --- 0.008.; 0.007- 0.006 a 0.005 0.004: 0.003- .003;0.002= 0.002-1 - - - 0.001 Type IA 24 -hr WQ Rainfall=0.83"_ Runoff Area=3,047 sf Runoff Volume=0.004 of Runoff Depth=0.83" Tc=10.0 min CN=0/98 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0. 83" Prepared by Olson & Morris Printed 5/21/2020 I-IydroCADO 10.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Page 20 Summary for Subcatchment 53S: Lot 3 Runoff = 0.01 cfs Q 7.98 hrs, Volume= 0.004 of, Depth= 0.63" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr WQ Rainfall=0.83" 3.047 98 Unconnected roofs HSC C 3,047 98 100.00% Impervious Area To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (fusee) (cfs) 10e Direct Entry, Subcatchment 53S: Lot 3 Hydrograph 0.012 0.01 cfs —Runoff 0.011 0.01 Type IA 24 -hr 0.009 WQ Rainfall=0.83" 0.008. - - - -- - - Runoff Area=3,047 sf RunoffVolume=0.004af 0.007 v Runoff Depth=0.63" 3 0,006 -- - - -- Tc=10.0 min FL 0.005 CN=0/98 .004 - 0.0041 0.003 0.0030.00250.001 " 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCADO 10.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 21 Summary for Subcatchment 54S: Lot 4 Runoff = 0.01 cfs @ 7.98 hrs, Volume= 0.004 af, Depth= 0.63" Runoff by SBUH method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, of= 0.05 hrs Type IA 24 -hr W(] Rainfall=0.83" 3,002 98 Unconnected roofs HSG C 3,002 98 100.00% Impervious Area Te Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) — Runoff Subcatchment54S: Lot Hydrograph 0.01 cfs 0.011; 0.01 Type IA 24 -hr 0.009 WO Rainfall=0.83"-- 0.008 Runoff Area=3,002 sf 0.007' Runoff Volume=0.004 of Runoff Depth=0.63" 3 0 006 Tc=10.0 min LL 0.005 CN=0198 0.004' 0.003 0.002. 0.0014 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) — Runoff Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfal1=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydrOCAD@ 10.00-25 sfn 04993 © 2019 HydroCAD Software Solutions LLC Page 22 Summary for Subcatchment 55S: Lot 5 Runoff = 0.01 cfs @ 7.98 hrs, Volume= 0.004 af, Depth= 0.63" Runoff by SBUI-I method, Split Pervious/Imperv., Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Type IA 24 -hr WQ Rainfall=0.83" Area (sf) CN Description 3,002 98 Unconnected roofs, HSG C 3,002 98 100.00% Impervious Arca To Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 10.0 Direct Entry, 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) — Runoff Subcatchment 55S: Lot 5 Hydrograph 0.01 cfs 0.011 { 0.01 Type IA 24 -hr 0.009 WQ-Rainfall=0.83" 0.008 Runoff Area=3,002 sf 0.007 RunoffVolume=0.004af Ru_n_off Depth=0.83" 3 0.00& Tc=10.0 min 0.005= CN=0198 0.004 - 0.003: - ------ ----.--------- 0.002' 0.001 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) — Runoff Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD® 10.00-25 s/n 04993 02019 HydroCAD Software Solutions ILC Page 23 Summary for Pond 44P: Rain Gardenl Inflow Area = 0.065 ac,100.00% Impervious, Inflow Depth = 0.63" for WQ event Inflow = 0.01 cfs @ 7.98 hrs, Volume= 0.003 of Outflow = 0.01 cfs @ 8.30 hrs, Volume= 0.003 at Atten= 36%, Lag= 19.1 min Primary 0.01 cfs @ 8.30 hrs, Volume= 0.003 of Secondary = 0.00 cfs @ 0.00 hrs, Volume= 0.000 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Peak Elev= 484.59' @ 8.30 hrs Surf.Area= 276 sf Storage= 11 cf Flood Day= 486.00' SurfArea= 955 sf Storage= 171 cf Plug -Flow detention time= 17.5 min calculated for 0.003 of (100% of inflow) Center -of -Mass det. time= 16.8 min ( 746.7 - 729.9 ) Volume Invert Avail Storage Storage Description #1 485.50' 120 cf 2.00'W x 67.001L x 0.501H Open Storage Z=3.0 #2 484.00' 50 cf 2.00'W x 46.001 x 1.50'H Growing Media Z=3.0 503 cf Overall x 10.0% Voids 171 cf Total Available Storage Device Routing Invert Outlet Devices #1 Device 2 484.01' 2.000 in/hr Exfiltration(Growing Media) over Surface area from 484.01' - 485.4 Excluded Surface area = 95 sf #2 Primary 484.00' 1.000 in/hr Exfiltration over Surface area #3 Secondary 485.83' 4.0" Horiz. Overflow C=0.500 Limited to weir flow at low heads Primary OutFlow Max=0.01 cfs @ 8.30 hrs HW=484.59' (Free Discharge) Lt-Exfiltration (Exfiltration Controls 0.01 cfs) 1=Exfiltration(Growing Media) (Passes 0.01 cfs of 0.01 cfs potential flow) Secondary OutFlow Max=0.00 cfs @ 0.00 hrs HW=484.00' (Free Discharge) 3=Overflow ( Controls 0.00 cfs) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCADC) 10.00-25 s/n 04993 © 2019 HydroCAD Software Solutions LLC Page 24 Pond 44P: Rain Garden1 Hydrograph 0.011,: 0.01 cfs —Inflow 001 - 0.003 I J' 0.002- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Inflow Area=0.065 ac flow 0.009 ary L—Secondary 0.008- Peak Elev=484.59' 0.007 0.01 cfs Storage=11 of N 0.006: 0 0.005 - LL 0.003 I J' 0.002- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: I.AD Horace Storm Calcis Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydfoCADiJ 10.00-25 s/n 04993 02019 HydroCAD Software Solutions I LC Page 25 Summary for Pond 56P: Soakage Trench Inflow Area = 0.066 ac,100.00% Impervious, Inflow Depth = 0.63" for WQ event Inflow = 0.01 cfs @ 7.98 hrs, Volume= 0.003 of Outflow = 0.00 cfs @ 8.52 hrs, Volume= 0.003 af, After= 52%, Lag= 32.2 min Discarded = 0.00 cfs @ 8.52 hrs, Volume= 0.003 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Peak Elev= 480.68' @ 8.52 hrs Surf.Area= 0.004 ac Storage= 0.000 of Flood Elev= 485.00' Surf.Area= 0.004 ac Storage= 0.007 of Plug -Flow detention time= 17.3 min calculated for 0.003 of (100% of inflow) Center -of -Mass det. time= 17.3 min ( 747.1 - 729.9 ) Volume Invert Avail.Storape Storage Description #1 480.50' 0.007 of 10.00'W z 18.00'L x 4.50'H Rock Chamber 0.019 of overall x 35.0'% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.00 cfs @ 8.52 he; HW=480.88' (Free Discharge) t1=Exfiltration (Exfiltration Controls 0.00 cfs) 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Time (hours) ® Inflow Discarded Pond 56P: Soakage Trench Hydrograph 0.01 7 -- — L 0.01 cfs 0.009 Inflow Area=0.060 ac 0-008 Peak Elev=480.68- 0.007 — Storage=0.000 of 4 0.006 3 0.005.. O.00cfs 0 LL 0.004 0.003= --. _ 0.002 0.001 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 Time (hours) ® Inflow Discarded Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0. 83 " Prepared by Olson & Morris Printed 5/21/2020 HydroCADV 10.00-25 s/n 04993 @ 2019 HydroCAD software Solutions 110 Page 26 Summary for Pond 70P: Soakage Trench Inflow Area = 0.070 ac,100.00% Impervious, Inflow Depth = 0.63" for WQ event Inflow = 0.01 cis @ 7.98 hrs, Volume= 0.004 of Outflow = 0.01 cis @ 8.49 hrs, Volume= 0.004 at, Alan= 50%, Lag= 30.1 min Discarded = 0.01 ch; @ 8.49 hrs, Volume= 0.004 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 bra Peak Elev= 480.67' @ 8.49 hrs Surf.Area= 0.005 ac Storage= 0.000 at Flood Elev= 485.00' Surf.Area= 0.005 ac Storage= 0.008 of Plug -Flow detention time= 16.3 min calculated for 0 004 of (100% of inflow) Center -of -Mass det. time= 16.3 min ( 746.2 - 729.9) Volume Invert Avail.Storage Storaqe Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max -0.01 cis @ 8.49 hrs HW=480.67' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 70P: Soakage Trench Hydrograph 0.012- 0.01 Cfs —Inflow 0.011 — —Discarded 0.01 Inflow Are =0.070 ac 0.009 Peak Elev=480,67' - 0.008 Storage=0.000 of 0.007 0.006 0.01 cfs- a 0.005 0.004 0.003 0.002 0.001 02 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCADV 10.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 27 Summary for Pond 72P: Soakage Trench Inflow Area = 0.069 ac,100.00% Impervious, Inflow Depth = 0.63" for WQ event Inflow = 0.01 cfs @ 7.98 hrs, Volume= 0.004 of Outflow = 0.01 cfs @ 8.47 hrs, Volume= 0.004 of, Atten= 50%, Lag= 29.4 min Discarded = 0.01 cfs @ 8.47 hrs, Volume= 0.004 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 ms Peak Elev= 480.66'@ 8.47 hrs Surf.Area= 0.005 ac Storage= 0.000 of Flood Elev= 485.00' Surf.Area= 0,005 ac Storage= 0.008 of Plug -Flow detention time= 16.0 min calculated for 0.004 of (100% of inflow) Center -of -Mass det. time= 16.0 min ( 745.9 - 729.9 ) Volume Invert AvaiLStorage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.00% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 8.47 hrs HW=480.66' (Free Discharge) t-1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 72P: Soakage Trench Hydrograph 0.011 0.01 0.009 0.008 2 0.007 U 0.006 CO 0.005 0.003 0.002 0.001 — Inflow Inflow Area=0.069 ac ® Discarded Peak Elev=480:66' -Storage=0.000 of 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 Time (hours) Designed By: LAB Horace Storm Calcs Type IA 24 -hr WQ Rainfall=0.63" Prepared by Olson & Morris Printed 5/21/2020 HydroCADO 10.00-25 s/n 04993 © 2019 HydroCAD Software Solutions I.LC Page 28 Summary for Pond 73P: Soakage Trench Inflow Area = 0.069 ac,100.00°/ Impervious, Inflow Depth = 0.63" for WQ event Inflow = 0.01 cis @ 7.98 hrs, Volume= 0.004 of Outflow = 0.01 cfs @ 8.47 hrs, Volume= 0.004 af, Atten= 50%, Lag= 29.4 min Discarded = 0.01 cfs @ 8.47 hrs, Volume= 0.004 of Routing by Stor-Ind method, Time Span= 0.00-32.00 hrs, dt= 0.05 hrs Peak Elev= 480.66' @ 8.47 hrs Surf.Area= 0.005 ac Storage= 0.000 of Flood Elev= 485.00' Surf.Area= 0.005 ac Storage= 0.008 of Plug -Flow detention time= 15.0 min calculated for 0.004 of (100% of inflow) Center -of -Mass det. time= 16.0 ruin ( 745.9 - 729.9 ) Volume Invert Avail.Storage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0% Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 8.47 hrs I IW=480.66' (Free Discharge) L1=Exfiltration (Exfiltration Controls 0.01 cfs) Pond 73P: Soakage Trench Hydrograph 0.011 0.01 Cfs — Inflow 0.01 Inflow Area=0.069 ac v Discarded 0.009 Peak Elev=480.66' 0.008, Storage=0.000 of " 0.007 3 0.006 0.01 cfs LL 0.005- 0.004- 0.0037 .0050.004 0.003 0.002' 0.001- 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) Designed By: LAB Horace Storm Cales Type IA 24 -hr WQ Rainfall=0.83" Prepared by Olson & Morris Printed 5/21/2020 HydroCAD® 10.00-25 s/n 04993 02019 HydroCAD Software Solutions LLC Page 29 Summary for Pond 74P: Soakage Trench Inflow Area = 0.070 ac,100.00% Impervious, Inflow Depth= 0.63" for WQ event Inflow = 0.01 cfs @ 7.98 hrs, Volume= 0.004 of Outflow = 0.01 cfs @ 8.49 hrs, Volume= 0.004 of, Allen= 50%, Lag= 30.1 min Discarded = 0.01 cfs @ 8.49 hrs, Volume= 0.004 of Routing by StarIndmethod, Time Span= 0.00-32.00 hrs, dt= 0,05 hrs Peak Elev= 480.67' @ 8.49 hrs Surf.Area= 0.005 ac Storage= 0.000 of Flood Elev= 485.00' Surf.Area= 0.005 ac. Storage= 0.008 of Plug -Flow detention time= 16.3 min calculated for 0.004 of (100% of inflow) Center -of -Mass det. time= 16.3 min ( 746.2 729.9 ) Volume Invert Avail,Storage Storage Description #1 480.50' 0.008 of 10.00'W x 22.00'L x 4.50'H Rock Chamber 0.023 of Overall x 35.0%, Voids Device Routing Invert Outlet Devices #1 Discarded 480.50' 1.000 in/hr Exfiltration over Wetted area Discarded OutFlow Max=0.01 cfs @ 8.49 hrs HW=480.67' (Free Discharge) L1=Exfiltration (Exfltration Controls 0.01 cis) Pond 74P: Soakage Trench Hydrograph 0.012 0.01 cfs 0.011 - - Inflow 0.01- Inflow Area=0.070 ac - Discarded 0.009 Peak -Elev=480.67' 0.008- Storage=0.000-af- 0.007 : 3 0.006 0.01 cfs LL 0.005 0.001 0 2 4 6 '8 10 12 14 16 18 20 22 24 26 28 30 32 Time (hours) s r3 an �� 8 K 3 l Lb e 8 3 _ E fE Pr F E 3 a oj2 E o33s s NFNo - oo m S i'l i3s a( � 03 I i