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HomeMy WebLinkAboutPacket, DRC PLANNER 4/26/2011 CITY OF SPRINGFIELD - .LOPMENT REVIEW COMMITTEE DISTRIBUTION DATE May 2, 2011 TO: ~ ~ ~ ~ ~ ./ -1' ~ ~ -;7 ~ ~ L v ---;7 7 ~ v ~ -;;' -f . RECEIVED 'Current Planning Staff: G. Karp, J. Donovan, Liz Miller, M. Metz er, Lissa Davis, L. Pauly, Tara Jones, Andy Limbird, Dave Reesor Steve Hopkins Molly Markarian 'Matt Stouder, Engineering - Public Works Departmen Brian Barnett, Traffic EngineerlPE, Public Works Department (agenda only 2102) 'Michael Liebler, Transportation Planning Engineer, Public Works Department 'Gilbert Gordon, Deputy Fire Marshall, Fire & Life Safety Department Melissa Fechtel, Fire Agenda only 'Ronni Price, Planner, Willamalane Park and Recreation District (Greg Hyde) 'Sanjeev King, Springfield Utility Board (Electric) "Yan Seiner, Springfield Utility Board (Water) 'Bart McKee, Water Engineering Supervisor - Springfield Utility Board (Water) Jack Foster, Springfield Utility Board (Energy Conservation) Amy Chinitz, Springfield Utility Board (Drinking Water) . Jim Henry, Central Lane Communications 911 Leo Lambert, US Postal Service 'Billy Elder, Northwest Natural Gas (John Radosevich, alternate reviewer) 'Phil Fields, Lane County Transportation (Celia Barry, Steve Smith, Shashi Bajracharya and Lydia McKinney) Thomas Jeffreys, Emerald People's Utility District (EPUD) George Ehlers, Lane County Sanitarian [Urban Transition Zone] (if applicable) Jamie Porter, Rainbow Water District (Dean Hill alternate reviewer) (' only if in the North Spfld area) Ralph Johnston, Lane Regional Air Pollution Authority (if applicable) Tom Henerty, Comcast Cable (if applicable) Mark Oberle, EWEB (electric) (property) Dick HelgesonlMel Damewood, EWEB (water) ('If in Glenwood) Jeff Towery - AIC Development Services Director (agenda) John Tamulonis, Economic & Community Development Manager . Jackie Murdoch, Assistant Building Official 'Lisa Hopper, Building Services Representative . Greg Ferschweiler, Keith Miyata, Brian Conlon, PW Dept. 'Craig Fitzgerald, Maintenance PW Dept George Walker, Environmental Works Dept., (agenda only) Deanna Buckem, Engineering Assistant, Public Works Dept. Police Chief, Jerry Smith, Police Department (agenda) <Will Mueller, LTD Norm Palmer, Quest Corporation (agenda 'Scott Nelson, Planning & Development Manager, ODOT, State Highway Division Jeff DeFranco, Springfield School District .(agenda) William Lewis III, Financial Services, Springfield School District ( agenda) Joe Leahy, City Attorney Chris Moorhead, City Surveyor APR.26 2011 By: :DR-Co p~ I of 1.9 p~ (agenda) (agenda) A request for land use action, as described on the attached agenda, has been received by the Development Services Office. Specific concerns of your divisionldepartmenUagency should be addressed. If you have comments or requirements of this proposal, please send them in writing to the assigned planner @ Development Services Department, 225 Fifth Street, Springfield, OR 97477. Your comments may also be sent via e-mail or if you are a ORe internal user attach as document within the Accela Automation. If your written comments are not received by Friday, May 13, 2011 specific concerns of your division/departmenUagency will not be addressed unless you attend the meeting on May 17, 2011. The Development Review Committee holds staff review meetings on Tuesday@8:00-10:00a.m. You should also plan to attend the staff meeting on Tuesday if you have specific concerns so that the Planning representative can discuss them prior to meeting with the applicant. If the Planner feels it is necessary for you to participate in the public meetings he/she will let you know on Tuesday. . full packet . . AGENDA DEVELOPMENT REVIEW COMMITTEE DEVELOPMENT SERVICES DEPARTMENT 225 FIFTH STREET Conference Room 615 Staff Review: May 17, 2011 @ 8:00 - 9:00 a.m. 1. SITE PLAN REVIEW #TYP211-00007 (PRJ11-00007) HIATT 8:00 - 9:00 a.m. Assessor's Map: 17-03-26-13 TL 102 Address: Vacant _10th & Q Streets Existing Use: Vacant Applicant submitted plans to construct (4) duplexes, 8 dwelling units on vacant lot. (Hiatt Estates) Planner: Steve Hopkins The DRe informational packet for this meeting is available on-line for you to review or print out @ www.sprinQfield-oLQov/weblink7 1 ;City of Springfield Development Services Department 225 Fifth Street Springfield, OR 97477 . . Site Plan Review . .. . -. -...- A licant Name: Michael Hiatt Com an : ....'., ."""::'";,,-::,,,,",,-;,t. Phone: 514-915-3569 Fax: 541-342-8251 on 97405 Phone: 541-746-0637 Fax: 541-746-0389 on 97477 Phone: 541-726-1382 Fax: Address: 3283 Ja hawk Court, Eu A Iicant's Re .. Lane Branch Com an : , Inc. Address: 310 5th Street Owner: Bernard Hiatt Com an Address: TAX LOT NO S : 102 ASSESSOR'S MAP NO: 17-03-26-13 Located at the northwest corner of the intersection at 10th Street and Street. 0.58 Acres rgJ S uare Feet 0 Pro osed Name of Pro"ect: Hiatt Estates "'.,,'"," ~ - Description of If you are filling in this form by hand, please attach your proposal description to this application. Pro osal: 4 Du lexes totalin to 8 Dwellin Units Associated A lications:' yc:z",}Jv{.{,.. Pre-Sub Case No.: P eH-OOOO 8' - (:;J:::;i:::D' Date: 3-/1- ( Reviewed b Date: Reviewed b ~ TOTAL FEES: $ 4 .'21. 2- 2.1.11- Posta e Fee: $ 1(., PROJECT NUMBER: P 1\- oroo7 A Iication Fee: $ .. ";'w.i0ij(+;""i:'::~,,:.:rJ.i:t;;;::;::7bliii';(:<"'!';"",~::; ,;;;:f;;;;"'~f.'5'J[;;:!~: "_:"'""':j.2;:;U!M:mtff!:(I;l"""'~_;"S;-;fE;",,'H;;;Wif;'E"~;.z.'"w:-"'I- ,J'" . ~.;" Revised 11/19/09 Original Submittal 1 of 10 spr_map' . . Page 1 of 1 TYP211-00007 Sit~lan Tentative 17-03-26~ TL 102 Hiatt Vac-10th & Q Sts . Cl'I .RST., " ,~ " ", ,.' -< \,., ., .,;' I,.,,' FUCHSIA ST ~ II) I- .0 . ..-1 . ,.,,} .-' ~ c'i , " -,. ST 1.:, QST . ,,;-'-:~~~~":'ir3.;~:,:~~~~';;J'{~~i(l:_ ,,:',_ ,:: -:;:""';_ "'co.,.,-' , ';':. ,,:__,~_') ..,C;.- ','_:. l,_' -\jd~;,~..! ~~.q".,k'~.l!' ~~1'#at),::.1i.>.07'''~~,~~~--,~.1{h~J .~-l!~ "'!"i" - .,t:<;:, -'''- '''~~..,,''~~:'::6:,\f~',.;&.,,~%:-~t~~f~''''''k''') , ;, ...~ . ',. " c;'. - 1-105 " . ':..-:. '1-105 .,~<!~,;~~~tf" ~ _,~,,!::_,'j;/:0i~!R;:.~.:~,;,..ri:V ,-,~.,.t.~~.d;\;;~!"~~ .'^,_ ,,"co, "'" . :;: <~~. -: ' ,'" I II I I I . 'I': . 'I' .".',. . .." "':". .:- ...."'.. :".,;' r.:'~.'. . "....,.;,,-' . - ~" ' ~ A . ,,~. .., , -. - . ,::" '_: ..~:.,::'I'~t?~\: , 'N A Date Received: APR 2 2 2011 Original Submitlai http:// spifs020/mapguide2009/mapvi ewerphp/printablepage, php ?SES SI ON =bc625faa - fiIf- fiIf- 80", 4/26/2011 . ~ ~ ~ . , ;; , i II . .", ., ,- ;,;; '11' ,< . i '"I I ' .. ~ I !' j ~III , . ~ I ~ ;1 ,:J " 1 I I : 1 I 1 .. II !. I I I 1 ~ I I ~ : I I : " Aj , ! ~".""nn o ..... <ii :i" !!!. fJl c:: 0- 3 ~ !!!. o ~ CD :::0 CD g <' CD 0.. ,. )> " :;:0 "" "" "" c::> - - ~~~ i I ."ln~ i:l IIIH 11111111 qiHn In. ~II! II I I U I E n'l 1 II !:~ r III :::; ~!f . I'll ~ : i I lI'r _ ., J d. 5' :~ U' p . <--- ,. !/ . ,.- ~ ...1' ~'"T . ;~-t~";~Rfn ~ }.~ <:> I i~ III Ii'! I ~ II III I ~ . ~ [0 " i !. 111 n~:1: · 1111;:1 ~;;;i . ~ ~;. '~ll - lIlIili &1' ~ II "'" 1iI <l!. _ i mIll' I III IE , 'i: ;;! ~ " "'.. ;:l 0..... SE"':I Iool..1 ~?: !i: ~:""[!J """"",,; ~~~'to:J ~ ....~~C/)~ "., II o~ ~ ~ ~~$b~:fJ' - ~,.. "" I . ~ tzj ~~C/) ..' <>:a ~~ " '" . . WRITTEN NARRATIVE FOR HIATT ESTATES DEVELOPMENT 17-03-26-13 TL 102 This Site Plan Review Submittal application is a proposal to develop the vacant lot at the northwest corner of loth Street and Q Street (Map 17-03-26-13, Tax Lot 102) into multi-family dwellings. Currently, the lot is vacant with no existing structures on site. The total site area is 0.58 acres and is generally flat with vegetated ground cover consisting predominately of grass. There is a 60" filbert cluster in the southwest corner of the lot. According to the Soil Survev of Lane Countv, by the Natural Resource Conservation Service, the soils on site consist of Salem (I 19) and Coburg (32). Salem soil is moderately well draining (Hydrologic Group: B) with a depth to high water table greater than 6 feet. Coburg Soil has moderately slow permeability with a hazard of water erosion that is slight. The new development proposes the construction of 4 new duplexes or 8 dwellings along a private concrete access drive aisle. Each dwelling will have its own garage and driveway. All units will have individual utility services and meters. A 6" sanitary pipe is to be constructed along the private drive to be used as a service lateral for this development. S tormwater management will be met by installing pervious concrete pavers on half of the non- building rooftop impervious surfaces. The remaining non-building rooftop storm water runoff will be collected by a 2 chamber steel catch basin with an oil and grease filter. This catch basin will connect with the roof downspout lateral running through the project and convey to the 21" . storm water main on I Oth Street. Solar access will be met by having 10' setbacks from the north lot line for the northern two units. Per Table 3.2-1 from the Springfield Development Code, with a North-South dimension of 65', a Shade Point height maximum of20', the solar setback minimum is 8'. A North-South depth of 65' was taken from the center of the access driveway to the north property line because this dimension functions as a property line. Using a setback of 10' allows a conservative design regarding Solar Access Requirements. All additional Site Plan Review Submittal items are included with this packet. . Date Received: APR 2 2 '2011 Original Submittal . . .=:=",~,"., >-". . - STORMWATER MANAGEMENT PLAN AND DRAINAGE STUDY FOR Hiatt Estates 10th Street and Q Street Springfield, OR -,,"-"""'~- 'r.'~"""'c."'\" March 11, 2011 Prepared For: Michael. Hiatt 3283 Jayhawk Court Eugene, Oregon 97405 Branch Engineering, Inc. 310 5'h Street Springfield, OR 97477 Phone (541) 746-0637 Fax (541) 746-0389 Inc. Branch Project # 11-017 . Date Received: APR 2 2 2011 Original Submittal . . Storm Drainage Evaluation lO'h Street ohd Q Street --H jatt STORN1 DRAINAGE EVALUATION Hiatt Estates Springfield, OREGON This evaluation was prepared to summarize the drainage system proposed for the Hiatt Estates development. The site is located at the northwest comer of the intersection at lOth Street and Q Street in Springfield, Oregon. Half of the stormwater will be treated on site' by using pervious pavement. The other half of the stormwater will be graded to a catch basin and be filtered before entering the city's stormwater conveyance system. Existing Conditions The site currently has no existing structures. The total site area is 0.58 acres and is generally flat with vegetated ground cover consisting predominately of grass. For additional information on the utilities and services just off site, see the Existing Conditions Plan. According to the Soil Survey of Lane County, by the Natural Resource Conservation Service, the soils on site consist of Salem (119) and Coburg (32). Salem soil is moderately well draining (Hydrologic Group: B) with a depth to high water table greater than 6 feet. Coburg Soil has moderately slow permeability where the hazard of water erosion is slight. Proposed Drainage System The proposed development will have 0.33 acres of impervious area and 0.06 acres of pervious concrete. The runoff from the roofs will connect with the stormwater lateral along the private drive and pipe to the 21" main along 1 Oth Street. Runoff from the driveways and the outside 2.5' of the private access street will be treated and infiltrated by using pervious pavers. All remaining storm water runoff from the street will be collected by a catch basin that will have removable oil and grease filter. This catch basin will connect into the storm water lateral along the private drive. Table 1 below shows all impervious and pervious pavement areas and how they will be treated and conveyed. Table 1: Pro Dosed Stormwater Svstem Impervious Surface Area Treated (yes/no) Infiltrated/Connect to City ,." '.' Connectto:Ctb; . . ' Ro'of,'Area 10464 No Private Drive (Impervious) 2570 Yes Infiltrate/Connect to City I".. . ... 990 Yes Infiltrate Private Drive (Pervious) Driveways (Pervious) 1880 Yes Infiltrate I Concrete Walks 744 Yes Infiltrate Concrete Patios 640 No - TOTAL 17288 IPate KeCelVea: APR 2 2 2011 Origir/lar'SbfmW!fflri"g, I"c. - Page I . . Storm Drainage Evaluation 10th Street ond Q Street ~-Hiatt Stormwater Quality Per City of Springfield Stormwater Design Standards section "3.03.6 Vegetative Treatment Requirements", a "minimum of 50% of the non-building rooftop impervious area on a site shall be treated for stormwater quality improvement using vegetative methods." For this reason stormwater quality will be met by using pervious pavement for half of the drivable surfaces and a 2-chamger steel catch basin with a removable oil and grease filter for the other half. Pervious pavers are an approved treatment option and will be used on all driveways and the outside 2.5' of the Private Access Road. Pervious pavers provide treatment in the removal of pollutants such as hydrocarbons, sediment, and metals and allow for the quick removal of stormwllter through void openings. Pervious pavement also helps promote groundwater recharge. Attached is the Design Model of the Pervious Pavers to be used. In order to detain additional runoff from the site, there will be a 5'x20' pervious pavement island around the 2-chamber steel catch. This will provide detention for some of the runoffbefore entering the 2-chamber steel catch basin which will provide pre- treatment for the remaining pavement areas as required by City of Springfield Stormwater Design Standards section "3.03.5 Parking LotslPaved Areas." The use of the 2-chamber Steel catch basin with an oil and grease filter for pretreatment is a common practice for the City of Springfield. Stormwater Runoff Analysis For a conservative analysis of the stormwater runoff from the site, we will assume no detention from the pervious pavement island in the Private Access Drive. Therefore the total impervious area will be 0.30 acres which includes the impervious roadway and the roofs from the site. The following Rational Method calculations show the approximate maximum runoff flow for the 25 year, 24-hour storm event. In order to use the Rational method an assumed method was used for finding an hourly flow. Date Received: APR 2 2 2011 Original Submittal Branch Engineering, Ine. - Page 2 . . Storm Drainage Evaluation 10th Street and Q Street --Hiatt From Standard Type IA Hydrograph 25-Year, 24-Hr Storm 4.8 in *per: City of Springfield Standards 4.03.3 Water Quality Design Storm (ED5P April, 2006) In a Type IA storm event, the max Percent Rainfall in a 10 minute interval is 5.4% near the end of the 7th Hour. (0.054*4.8) = 0.2592 il1/lO min in/lO min 1.56 in/hr RATIONAL METHOD. Intensity= 1.56 in/hr Runoff Coefficients, C Pavement & Roofs Lawns 0.9 0.17 Areas . A (acres) Pavement 0.3 Lawns 0 Total 0.3 Composite C = SUM{Cindividual areas)xlAindividual areas) Atotal Area Composite C = 0.9 Q( cfs)=C( -) *i(in/hr) * A(acres) Comp C= Intensity= Area= Q= 0.9 1.56 in/hr 0.3 Acres 0.4212 cfs From this analysis, the maximum runoff flow from the site for the 25-year, 24 hour storm event is 0.42 cfs entering the 21" storm main on 10th Street. Date Received: APR 2 2 2011 Original Submittal Branch Engineering, Ine. - Page 3 ICPI./'~. J~ /"-\',' \. iXiTilIO:K~G{j~C.Jtt~il~?Y~ __~\'~lfi"'7I;O<~-J!l..!E.n::}~ Site Information Laver Information Paving Layer Base Material Subbase Material Subgrade Material Structural Desio" Information Hvdroloaical Desio" Information . . Permeable Interlocking Concrete Pavements Structural and Hydrological Design Inputs Design'Title: Unknown Pavement Length Pavement Width Pavement Area Catchment Area 179 It 15.5 It 2,775 It' 3518.5ft'(Avg CN=73.41) Structural Coefficient Structural Number Thickness ASTM No 57 Stone Structural Coefficient Structural Number Thickness Porosity Void Ratio Permeability ASTM No 2 Stone Structural Coefficient Structural Number Thickness Porosity Void Ratio Permeability .3 1.5 in 5.125 in 0.05 0.2 in 4.0 in 0.288 0.4 782.442 in/hr 0.05 0.6 in 120 in 0.318 0.47 31,050.889 in/hr Subgrade Strength Porosity Void Ratio Permeability 21000.0 psi 0.342 0.52 0.023 in/hr Average Annual Dairy Traffic Design ESALs Design Structural Number Pavement Structural Number Structurally Adequate 30,000 1.14 2.3 Yes Rainfall Location Storm Type Springfield, OR IA Storm Return PeriOd 24-hour Rainfall Satisfies Infiltration Satisfies Storage Satisfies Storage (Years) Intensity in Capacity Goal Capacity 2 3.3 Yes Yes Yes 25 4.8 Yes. Yes Yes Storage goal represents 85 percent of maximum water storage capacity Date Received: . APR 2 2 2011 Original Submittal Page 1/1 2/28/2011 12:40: 11 PM ICPI~.5&. f-wii;oj;;T~;Q~CRni 2~~-~!:.~:!!!l:..t.. . . Permeable Interlocking Concrete Pavements Structural and Hydrological Design Inputs Design Title: Unknown Hvdroloaical Desio" Results Equivalent Design Storm Storage Goal 25 year storm Storage Capacity 25 year storm Combined Site Hvdrolooical Characteristics for Permeable and Non-Permeable Areas Site Area 3518.5 ft' Average Curve Number 73.41 Average Rational C Value Eo~veJent Design St';;lf!T, ..'.-rt!' Run::'! 10 z;: " C. ~ "15 ~ ..;; s: 10" " , " " B 9 10 " i~ Stor~r, p~!"., i 712 i~' ;:~ ~. 22 2~ 24 25 ~: ,. , .,:.", I ...-.--.-----~.__.___'.J I I I I ~ ~ ~ =-' -:---\ " E 8 S ,..' 1 i ~ d .,'" L' i~ .~ 2: L' 2L L'; ::1 2:'- - 2'Yeel - 25.1''<::5.1 . ~._."____*_.u_,____._.._ ....________u.,....... _.. ___ ----- ---..-.- '~.-.. --_._-~-_.._..,..._-,- - ------......--.--.----...-........ Date Received: APR 2 2 2011 Original Submittal Page 1/3 2/28/2011 12:40:11 PM I CPI"~;;> .f';=riNI:;O'''i'~;(:r.')'fi3;~=n(~'j _P"'\'E.~.~~,y[.~:[~ . . '.'- Permeable Interlocking Concrete Pavements Structural and Hydrological Design Inputs Design Title: Unknown , ~ /--...~ t , I i I i I I J I I I I I j I I I I I' t I I . I . I I 1'1 I 13 14 i~ 1~ ': lE i5 2e' LI "-L ",~ 24 25 I . ..... __..__~__J ~l -> -0 r~: j " , ~ . I I I' t . G 2 6 7 s 10 11 12 ',.-, - 2-Year - 25-Ye.ar ....." < ~ fl l \~ "'-- . Oil ,. .~ , , , ~ , r , , , , , r , , , , , , , , , , , t S ; 0 1 1 , , ;.:. , tf." " .c , L.: -, - lu o' .. . .. . ':"-./ - 2-Y..:.ar - 2S-Ye~r t j ... "-~----"'-'--"-"-"--------'--'--'-------'-'-"'--'-------..--..-.---__.______._._____.1 ---- 7-'r~d: - 2:,-Y~~1 j I I I I I , , ! --'---Oate'Received :-.----) i C.-.f l " ~. .. Cc j1 .'::. ".' -: \.:- :~ .:::. l'l ,;i :!~ c' 'j " , f , , , , , , I , I , r , , I , , , , , , , , , I , I , , . , 1 i 1.2 . i..: , ;~ '0 i? 2~1 21 L .' . .~ c .. - I< " - '" APR 2 2 2011 Page 2/3 Original Submittal 2/28/2011 12:40:11 PM ICI~I::~q,~ ' NJi.:il(OXIN;(()"(:Rn~~:;; ~~~I~':::~E.!~'f!.!!ljl1:.~~V- g[l.b ~ c['.4 c' Co. c:: '\ O.L o . . Permeable Interlocking Concrete Pavements Structural and Hydrological Design Inputs Design Title: Unknown c i I j I I I I ; ; I 'J o 2 3 ~ ~5 <jJ .;; Z'" -:hi (; o :... II 1:~ 13 i4 is 'it 17 18 19 2C 21 22 23 24 25 - ?Yez,: - is.Yea;:- - n! ~_ .~.. H" . ~, ~-... ' (Ii -~. l "'---___________~ ..! -----..------ --... /, ~ .,-/ ./' ---- - ~--<~ -------- .. -------=~-"""_.--- ------------... 2 " ,. i~ 18 is ?O :2 ~_ 23 ?~ 25 ;:' t! , L r.~;~; - 25.";',ei;' -~ Date Received: APR 2 2 2011 Original Submittal Page 3/3 2/28/2011 12:40:11 PM '0212512011 15: 28 FAX 541 . 1021 CITY OF SPRINGFIE~W I4J 001 PUBLIC WORKS DEPARTMENT ADMINISTRA TlON ENGINEERING DIVISION ENVIRONMENTAL SERVICES DIVISION MAINTENANCE DIVISION TRANSPORTATION DIVISION TECHNICAL SERVICES DIVISION 225 FIFTH STREE7 SPRINGFIELD, OR 97477 WW1JV.ci. springfield. Of. uSlcfept....pw. htrr, www.cl.springfield_ or. U~ STORMW ATER MANAGEMENT SYSTEM SCOPE OF WORK ________.___________________. (Area below this Ii/,efllled out by Applicant) ----------------------~----_ , (Please return 10 Malt Stouder @ City of Springfield Public Works Engineering; Fax #' i36-IOn, Phone # 736-1035) Project Name: Ii :..tf 6s~~c'" Consultant; J),'onLh E:-') ;f1n,-;,,,] Land Uses: ,a.e"n',,)cn h", i Project Size (Acres): Approx, Impervious Area: /,,'i<ct D~,ripri,., Drainage Proposal (public cOlli1ections, pipe sizes and layout, etc.): Date: Phone #: Fax#; Email: Approx. Pervious Area: ;}.-;z5-,?,oll 51"1- 7f(.-063 7 Proposed Stormwater Best Management Practices (EMP's): ------------------- (Area belvw this line filled out by the City and ReturnerJ to tf,e Applicant) -------------_,__ (At a minimum, all boxes checked by the City on the jrQnt and buck of this sheet shall be submiltedfar an application to be complele for'submitTal. although other requirements may be necessary.) . Drainage Study Tvpe (EDSP Section 4.03.2); (Note. UH lllay be substituted for Rational Method) I)'i. Small Site Study - (use Rational Method for calculations) o Mid-Level Development Study - (use Unit Hydrograph Method for calculations) o Full Drainage Development Study - (use Unit Hydrogrnph Method for calculations) Environmental Considerations: IT Wellhead Protection Zone: lu -2.u yV' 0 Hillside Development: VI A- o Setback Requirements (Wetland, Riparian): f'1 J ;+ 0 FloodwaylFloodplain: )U / A Downstream Analvsis: -tJo ('I(1,,1~5'-~ f'c'I/;,roJ rF P(,~;"v5 <;.otIM'j5 v-/;);L"d ",e Drev::"",~I/v ci!S(Jv55Cd tp V'cduce n...Yl(J{fD~teR~ce{\fe-a~.& o N/A I o Flow line for starting water sud'ace eievation: o Design HGL to use for starting water surface elevation: U Manhole/Junction to take analysis to: APR 2 2 2811 0, iyi"al Ol:ltlMittal AoMINISTRA TlON I TECHNICAL SERVICES I ENGINEERING: (541)726-3753 . FAX (541)736-1021 MAINTENANCE' (541)725-3761 . FAX (541)726-3621 TRANSPORTATION (541)726-3753 . FAX (541)726-3781 '02/25i2011 15:28 FAX 541 4Ia 1021 CITY OF SPRINGFIE~W @002 COMFLETE STUDY ITEMS * Based upon the information provided by the applicant on the front of this sheet, the following list represents a minimum of what is neededfor an application to be completefor submittal with respect to drainage; however, this list should not be used in lieu of the Springfield Dl?Velopmenr Code (SDC) or the City's Engineering Design Standards and Procedures (EDSP). Note that compliance with these requirements does not constitute site approval. Additional information may be required which 'Is slfe specific. General Study Requirements (EDSP Section 4.03) Req'd NIA o 0 -rhe drainage study shall be prepared by a Professional Civil Engineer licensed in the state of Oregon. ~ 0 A complete drainage study shall be submitted if the development is to be larger than one acre, create more than 5000 square feet of new impervious surface, generate peak flows in excess of 0.5 cfs, or modify an existing system with 0.5 cfs or greater. OS 0 Calculations showing sys!em capacity for a 2-year stonn event and overflow effects of a 25-year storm cvcut. " Interim Design Slandards/Water Quality (EDSP Chapter 3) , ,0 ~ g] ~ o EJ o o Submit supporting calculations for the method of stormwater treatment to be implemented. All non-building rooftop impervious surfaces shall be pre-treated for stormwater quality_ Howcver, a minimum of 50% of the ooo-building rooftop impervious surface shall be treated by vegetated methods_ , Where a stormwater treatmmt or infiltration swale will be used, specify which typo and submit calculations for siZing, velocity, and flow. Also show bottom and side slopes, distance from structures and lot lines, as well as specifYing the seed mixture to be used. For swales serving an area ofless than 15,000 square feet, a simplified design approach may be followed as specified by the Bwean of Environmental Services (BES). Calculations, sizing and the area the swale serves ,shall be included. . Swales which serve areas greater than IS,OOOsquare feet shall submit calculations aDd sizing requirements in accordance with Chapter 3 of/he City ofPortlnnd Stormwater Manual (BES). All building rooftop mounted equipment, or otl:ter fluid containing equipment located outside of the building, shall be provided with secondary containment or weather resistant enclosure. o o 2'\1 o Review of Dowostream System (EDSP Section 4_03.4.C) o 1!9 A downstream drainage ~alysis sball be submitted for developments proposnlg to construct more than 5000 square feet of new imperviousness slIIface. On-site drainage shall be governed by the Oregon Plumbing Specialty Code (OPSe). o !1;l The applicant shall include eleVlltions of tile HGL and flowlines for both city and ptivate systems where applicable. Design of Storm Systems (EDSP Section 4.04) I'J 0 Ensure flow lines, slopes, rim elevations, pipe type and sizes are clearly indicated on the plan set. IKI 0 Minimum pipe cover shall be 18 inches for reinforced pipe and 36 ,i/lches for plain concrete and plastic pipe materials, or ' proper engineering calculations ,ball be provided when less. The cover shall be sufficient to support an 80,000 lb load without failure oflbe pipe structure. ~ 0 MaJlDing's "n" values for pipes shall be consistent with Table 4-1 of the EDSP. All storm pipes shall be designed to achieve a minimum velocity of three feet per second at 0.5 part full based on Table 4~ I as well. ~ ,; t,~";" II. '." . . OtherlM.sc - rJ 0 If a detention facility is required, it shall be designed to capture nmoff so the discbarge from the sjte ailer development does not exceed pre-development conditions or available capacity, based on a 2- through 25-year, 24 hour stOIlD. (EDSP Seetion 4.10.1) - :.pav'..... p"",,,,,-t Chn he. u:>i"?J ;r, )"e<' of de+mtJon, )'S 0 ff a ctrywell (UIC) is proposed, it shan not receive runoff from aoy surface wlo being treated by one or more BMPs, with the exception of residential building roofs (EDSP Section 3.03.4 A). Additiona! provisions apply to tltis as required by the DEQ. Refer to the website: www.deQ.state.oLus/wq/groundwaluichomo.hcm for more information, lEi 0., Ule's may not be located within any easement, and must be no closer than 10 feet from ~elglil~~ or property, line (EDSP Section 3_03.4.8). APR 2 2 2011 *' This form shall be In,cluded as an aflachmenr, inside rhe front cover, of (he srormwaler study Oriainal Submittal . . Map Unit Description: Salem-Urban land complex-Lane County Area, Oregon Hiatt Estates Lane County Area, Oregon 119-Salem-Urban land complex Map Unit Setting Elevation: 300 to 800 feet Mean annual precipitation: 40 to 60 inches Mean annual air temperature: 52 to 54 degrees F Frost-free period: 165 to 210 days Map Unit Composition Urban land: 45 percent Salem and similar soils: 45 percent Description of Salem Setting Landform: Stream terraces Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Parent material: Gravelly mixed alluvium 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 to high (0.57 to 1.98 in/hr) Depth to water table: More than 80 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: Low (about 4.8 inches) Interpretive groups Land capability classification (irrigated): 2s Land capab#ity (non irrigated): 25 Typical profile o to 7 inches: 'Gravelly silt loam 7 to 26 inches: Gravelly clay loam 26 to 60 inches: Very gravelly sand Description of Urban land Interpretive groups Land capability (nonirrigated): 8 Date Received: Data Source Information APR 22'2011 Soil Survey Area: Survey Area Data: Lane County Area, Oregon Version 8, Feb 9, 2010 Original Submittal USDA ",-= Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3/23/2011 Page 1 of 1 . . . . Map Unit Description: Coburg-Urban land .complex-Lane County Area, Oregon Hiatt Estates Lane County Area, Oregon 32-Coburg-Urban land complex Map Unit Setting Elevation: 100 to 1,300 feet Mean annual precipitation: 30 to 60 inches Mean annual air temperature: 50 to 55 degrees F Frost-free period: 160 to 235 days Map Unit Composition .Coburg and similar soils: 55 percent Urban land: 30 percent Minor components: 4 percent Description of Coburg Setting Landform: Stream terraces Landform position (three-dimensional): Tread Down-slope shape: Linear Across-slope shape: Linear Parent material: Loamy alluvium over clayey alluvium Properties and qualities Slope: 0 to 3 percent Depth to restrictive feature: More than 80 inches Drainage class: Moderately well drained Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20 to 0.57 inlhr) Depth to water table: About 18 to 30 inches Frequency of flooding: None Frequency of ponding: None Available water capacity: High (about 11.0 inches) Interpretive groups Land capability classification (irrigated): 2w Land capability (nonirrigated): 2w Typical profile o to 18 inches: Silty clay loam 18 to 53 inches: Silty clay 53 to 65 inches: Fine sandy loam Description of Urban Land Interpretive groups Land capability (nonirrigated): 8 Date Received: Minor Components Conser Percent of map unit: 4 percent APR 2 2 2011 Original Submittal / USDA = Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 3/2312011 Page 1 of 2