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CCR1996078.- COMMON COUNCIL - CITY OF MUSKEG0 RESOLUTION #78-96 ACCEPTANCE OF PROPOSAL FOR SCOPE OF SERVICES GUIDE, AND ORDINANCE FOR STORMWATER MANAGEMENT PLANS WHEREAS, Rust Environment and Infrastructure submitted a revised proposal for an amount not to exceed $85,000 for Stormwater Management Plans, Guide and Ordinance; and WHEREAS, the Finance Committee has recommended that the proposal submitted by Rust Environment and Infrastructure be accepted for an amount not to exceed $85,000; and WHEREAS, 70% of the cost for the project will be contributed through a D.N.R. grant, and $1,500 from a Lake Planning Grant and $2,500 from Lake Denoon and City contribution ($1,250 each) with the City paying the remainder. NOW, THEREFORE, BE IT RESOLVED that the Common Council of the City of Muskego, upon the recommendation of the Finance Committee, does hereby accept the quote of Rust Environment & Infrastructure for Scope of Services for Stormwater Management Plans, Guide and Ordinance subject to approval of the DNR. BE IT FURTHER RESOLVED that the Mayor and Clerk are authorized to execute the documents in the name of the City upon review by the 0 City Attorney. DATED THIS 23rd DAY OF APRIL , 1996 SPONSORED BY: FINANCE COMMITTEE Ald. Domonic D'Acquisto Ald. Patrick A. Patterson Ald. David J. Sanders Deferred 3/26/96 Deferred 4/9/96 This is to certify that this is a true and accurate copy of Resolution #78-96 which was adopted by the Common Council of the City of Muskego. K. 2-/1d/Le7cce+v City lerk State of mlsconsin \ DEPARTMENT OF NATURAL RESOURCES Tommy 0. Thcmpnon. Qowernor George E. Meysr. Sscretary 2300 N. Dr, ML King, Jr. Drive. Box 12438 Southsasr Dlaf!lct Hsadqusrtlra Glorla L.-heon, Disrrlct Dirsclcr Mllwsukee. WI 63212.0438 TELEPHONE 414.283.8ECO TDO 414.263.8713 FAX 4i4-283-8483 OEPI. OF HAVJRAL RESOURCIS 4 March 21, 1996 c;I> Mark Paulat City Grants .4dministrator City of bluskqo \VIS2 S8200 Racine Avenue Muskego, u;I 53 150 Dear Mr. Paular: The Depamnent recommends thet 'IUST Envi:onr.cn: g? Infrzstructure be hired IO d:ve!op the srormwater managemelt plan fa rhe City bes:? 03 their March 14, 1996 pro~osal. This recommendation is condirioncd on an acccptable scope of :enices end rate adjustment by tk consultant. RUST E & I developed ik City's first srormw2t2: malagenmt plzn for the ares zroud Lic!c Muskego Lake. They are cmentl?. working to fixlize the construction plans for he Frecicm Square Project. T'ney alsc Five been awarded ~!e sronwarer management ph project for the Town of Yoway. All of tnex projecrs give RUST E PC I a very good knowlzdge of this ar2a ad this facr along wiiil qualified staff shodc lezC ta a high quality product for tht City X st.on3 group of consultants was given the op7ozunity to submit a proposal for this projec: and rzfused for various reasons. RUST'S strong praposal and ii's good past performam on projects in rhis area makc rhem a 5:ood choice to rxeivs this project. If you have any questions, please call ne at 263-8552. That you. 0 tVater Resources Engine:: e Quality Flaturzi Resoums Mmagernent Through Excellent Customer Service ce k; h.c LI. 0 Q ,- w 3 "--t 0 m NN 0 " i Page t 2 Mark Paulat Ciry of Muskego W162 55200 Racine Awntte Muskego, WI 53 Re: Revised Scope and Budget Phase 11 - Stormwater Manaycment Plan Dear hlr Paufat: James A, Bachhubsr Project Manager Rust Environment & Infrastrucrore CITY OF MUSKEGO PEUSE R STORVN’.4TER MAYAGEMENT PROJECT REVISED SCOPE OF WORS and BUDGET March 22, 1996 The scope of work and budget described below was d?veloped based on the Request for Proposal from the City of Muskego, and follow up discussions with the City staff. The scope describes in a; detailed a mer as possible, the tas’ks to be carried out under this projec:. Rust E&I recognizes tllat in projens of this nature, it is often advisable to corduct ”rrd-project” reviews to determine if changes to the scope are appropriate to more fully meer :ne city’s needs. Thesz reviews are built in to our projea approach, and we are prepared to make revisions :o the scope ciuork as the project progresses. The scope of work below and the attached budget hat been modified frol;; !he original proposzl submitral (March I?, 1996) in the following senera1 ar:as: The mral nonpoint source inventory will be limited to analyzing and revising a nl3xin~11n offifreen (IS) farm plans from within the project area The oricinal - proposal assumed a complete rLr3l analysis of all of the farms within the praject area. Culvert surveying and hydrologic/hydraulic analyses will be limited to a maximum of 30 key sites (to be selected by the City, Dm, and Rust). The orizinal proposal estimated of 55 culvenj to be surveyed. 0 The number of the sub-basins to be delineated and ar.?.ly;.ed within ;he project ha; been lirni;ed IO a maximum of 55 areas. Individual sub-basins fc: exh major ider to Lake Denoon or Big hluskego Lake will be included in the 55 areas. The original estimated level of &art for the urbar. nonpcint source analysis is not necessary Based on discussions wirh city staff and review of projected hrure land use maps. rhe urban development areas are not as extensive as originally assumed. SCOPE OF IVORK 1.1 Develop Project R’ork Plan Develop a Project Work Plan leading to a quality product through mutually agreed upon project objectives, procehres. and milestones. Quality, for Ruj;. means rneetiny our clients’ requirements Our project ream leaders will mea with the City. the Ad-Hoc Watershed Advisory Cammitree, and the WDNR to define projea success factors (goals) and orocedc1res which uil! incorporare these success factors Factors to consider when developing thehe goals may include. 1 hlxruh 2, 1‘??6 . . 0 2. Project schedule and milestones, Lines oicommunicarions, and Deliverables PROJECT GOALS AND OBJECTIVES & PCBLIL‘I:VTERAC TIO% 2.1 Interact with Ad-HOC Watershed Comn~ittee The ciiy build on the Citizen Advisory Cornmitree deveioped to assis: ir. the P’czst. I S:Omt\aa:er manageme% project. This cornminee has proven IO be eifccrive in eschanging infoma:ion regardir.c local needs, perceptions. and goals, and in enhancing the “usability” of a 5nal prccuct. The a2jn objectives of public involvement are thrmgh this committee are: ‘Determine citizen concerns relevant to stonnwater managemenr isxes, Obtain information on local conditions, 4 Inform citizens about stormwarer management issues 2nd u’arer qdity impacts in the City 3; .. Muskezo, and obtain suppon for the srormwater man?gc.mer,: p1.x 2.2 Define Go;~ls, Objectives and Policies Build consensus to identify the goals, objectives, and policies of the cit)”s Stormuarer ?vllanigemec; Progam that meets rhe needs of the City ofMuskeZo; the 1,luskego - \.L‘inc Lakes Pcsrity V\’are:shed Procram, and the Wisconsin Lakes Manxynent Plannins Grant Program This prccess will include meetings with the Citizen Advisory Cornmittee and will build coon the resalts gene:xcd in the Phase 0 1 project, and from this inves:igztion The goals will be based on rhe Big htuskego L&e drawdown projecr, the rne \iaskezo - Wind Likes Priority Watershed Plan, and the wafer quality objectives ts be esablishzd far L2St: Dmoon 3. DEFIAX PROJECT AREA 3.1 Collect Available Data Collect, review, and evaluate available information relz\-ant 10 the dzr.clopmenr sf a S;snwate: Management Plan for the study area. Peninent information includes ilcoti maps, ae-al photoprepn~, hydrologic and hydraulic design criteria for existiug and proposed develzpments. cidinances. plar.s, topographic maps, stomwater system record drawings, s~neys and dtjign rep%. present ar.d projected land use information, soils information, geologic inhnarion. cperation and mainxnance records, practices and procedures. historical flooding informstion (both verbal 2nd urirren), and other such applicable information, This information will be obtained rhrough me$:ings wi:k sppropri~e ciry oflicids and other agency staff 3.2 Drainage System Inventory The system inventory will make use of exisKi7s available infommicr! juch as rhe ion\ eye.?c: system map, as-built dra-jngs, and field inspections (as a~propriarr: to mnfirm invenr.xy im3r;oz:icn). The objectives of the inspection are IO. Conrim as-built information, * Derennine the physical condition of facilities. Identiiy maintenance requirements. and Confirm drainage patterns and divides. 3.3 Delineate Drainage Patterns Delineate drainage basins and sub-drainage basins wirhin the study area using 3vzilabie ro?oSraphic maps, stom sewer maps. aerial photographs. Drainage bask m! sh-basins .,vi!.i!J be used io evait1zt.e and define “critical areas” based on water qualit:; i1npac:s and hvtlrolc~icihydrau!ic capacity needs. Inventory of natural and constructed drainage systm feelures. pojjibly usrfui for dexntion 5s quality/quanrity control measures, will be prepared in a nxrarive. rabcix, and grzphic fc:mj. The project area will be sob-dividzd into a maximum of 55 sub-basins. Each xajcr ider to BIg Muskego Lake and Lake Denoon will be defined by a disinct sub-basin. This will zxbie identification of runoff volumes, rates, and nonpoinr scurce lo?dinss far each lake id?:. 3.4 Survey Culvert Elevations 0 Using Run’s Global Positior. Sur.q (CPS) equipmen:. key cuI~wts \vi11 be surveyed. .A maximum of rhiny (30) culverts will be selected for stlrveying The culvrris selected wiil be dc:erxined by consensus the City, WDIUR, and Rust. The cuIve?s will be !waled. upstream arid dGuns:earn inverts elevations derennined. lengh and diameler messed. and ciFe rnar?rial now!. .&I1 ciihis daia will be enwed into a database sysrem to provide a comprehensive record far rhz Ciry Ges. .*so, each sire will be photographed to provide additional information on :ha condition of each CLIII~ZG. 3.5 Assess Land Use Map exisrin~ and future land use for the projec7 ze3. Em1ir.g and future land use \vi11 be dererrrjne4 based on available land use data from the city, counry acdio: Ssurl~easrem Wiscansin Regi;nal Planning Commission (SEM’RPC) and riom discussiors with the Ci:y. .krizl photogra?hs. zoning maps and field surveys will also be used IO refine and update esisring land use in the rve!ershed. Existing land use conditions will be determined baser! on I995 SELVFST aerial phorogap’ns. The existing land use delineations will be verified based upon meeting wirh the city w.3. 3.6 Inventory Soils Map hydrologic soil classification for each sub-basin using the U.S. Deynrnent at’ Agricuiture Soil Conservarion Service Soil Survey Repon for Racine anC WalIkejha Comtiej. Sped enlpkasis -will be placed on each soil's potential to impact srormwat?r management facilities such as detention basins, infiitration and exfiltration systems. a 3.7 Identify Environmentally Significant .4reas Map werlands. floodplains. and orhrr envircnmenrally significanr cormunities within the study area using existing sources (maps and digital files) from the city, county. WDNR and!cr SEWL'RPC 3.8 Summarize Water Quality Analyze and prepare a scmmary of exisring water quality data for Big Muskeg3 Lake and Lake Denoon. Both lakes have water qualiry informarion from one or more ofrhe follolbing sources' the United States Geological Survey [USGS), WDNR, SEL'RPCI and/or local monitoring pro;: c. arns. This information will be reviewed to analyze trends. currenr condirions. and potenrial %rure conditions of the lakes. The water quality data will a!w be used to help prcduce project ~~21s. 4 recommended monitoring plan for Lake Denom will be developed and included i!l the Lake Denoon final repon. 3.9 Create a Digital Data Sxsteln Provide a database which will form the foundarion for the stormwater quality and quantity n1od:lil:g. and anzlysis of the existing and proposed stormwarer mar.qement fac.!ities. 'ihe darabaje will contain infcrmation mch as drainaze area, land use, culven diameters. lezghs. marrridl. and sicpes, channel dimensions, slope, and contriburins drainage area. The data will be mainrained on a spreadsheet-based or database system to facilitate efficient data management. ana!yjis. and reporting of results. &tapping will be done in a digital fomsr and appropliate map: will be prcducsd for the repon alxl public presentation purposes. 0 3.10 Assess Municipal Ope~:ltion,~lainrenance Inventory procedures currently used to maintain. inspec:. clean and repair stormwzrZr managemnt facilizies. Evaluate need ro change or increase main!enance pracc:iccs based on existing level of mainlenzqce and inspection of starmwater rn;u;agmen! system. Rust finds, at times. that icexpxi1,c. changes in, or additions to, operationimainrenance tasks can produce significant improvmc-ts il? water quality or reductions in floadiny. 4. A IVA L YSES 4.1 Calculate Stormnater Flows and \'olunles Calculate the peak discharge and nlnoff vo1ume:S for exlning and Lture land use. Simuixe ;ke rainfdl-runoff process for esch drainage basin for not only the 2-, IO-. 25- and 100-yex stcrm ebenIs, to determine the capacity of the key stormwater conveyance facilities in terms of nor only cubic fez 4 per second (cfs), but also in terms ofrhe leve! of sewice being provided (i,?., frequency at \v!lich facility may be over topped). 0 4.7 Evaluate Bydraulic Capacity of the Stormwater System Compare computed runoff rares to the hydraulic capacity ci the existing primary sronnwate: conveyance sysrem. The information obtained in Task 3.4 will be instrumental I providing accuiate data to condun the required analysis. Determine drzinage and flood prorection level of service provided by the existins stormwater management system. 1denti;j. deficiescies in rSe capaciry ofrhe existing stormwater system. Identify deficiencies in the capacity of existins stor~nwvirter srrucrures (the 30 key culverts identified in Task 2.4). Recommend improvements 13 facilities rhar arc derermined to be unable IO handlt: exisring and future runorTconditions. 4.3 Compute Eristing/FtIture Urban Sonpoint Source Pollutnnt Loads Estimate nonpoint source pollutznr lodings for each basin acd sub-basin with urban jresiden[ial, commercial. or other developed land use) using SL.4blV (Source Loading and Mm:lgement h\ctlel). The polluranrs to be analyzed will be limited to sedimenr. 10121 phosphorus, and 2 heavy netai, Esrimared loadings will identify “crirical” areas (e.g., areas :hat are the highest sources ofilonpoint scurce pollution) that will be targeted for rhe use of st:ilcturi and non-srrucural Besi Management Practices (BWs) The SLAMM model wiil also verify the ertictivencss oi‘the proposed BMPs. 4.4 Compute Eristing.Tuture Rural Notlpoint Source Pollutant Loads SLAWil is nor an appropriate tool to model pollutan: loads from rural (~gricul~uri) lands. Since much of rhe runoffconrriburin~ lad to the prajecr area is in agicalrurd land use. other merhcds nxsI be employed Rust will work with the Waukesha County L3nd Consenation De;lannierit to obtain rural inventory results from the Uuskego-Wind Lakes priority watershed planning process. The priority watershed inventory process will develop pollutant lcads from upland erosion. aninzl wase runoff, and channel (or streambank) erosion. These sources will be included in the total “pollution FiClUIX” 10 conducr a COrnpre!lensive analysis of pollurion sources. Esrimate nonpoint source pollution loadings from rurd lands using WDLX’s nonpoint source field icventory compiled curing the preparation of the Muskego-Wind Lakes Prioricy Watershed Plan. Fihen (1 5) selected farm plans, from the Waukesha Count): files will be reviewed by Rust for the reed for additional apcultural best manJgemen: p:acti;cs. The farms to be amlyzed will be &:ermined rhrough consensus nirh the ciry. WDSR ad Kust. At least r\w oithese farms \bill bi: Lvithin the Lake Denoon watershed. 0 4.5 Critical Basin Loadings Identify xirical sources of nonpcint source pollution, A comparison will be made of the estimarea rural and urban nonpoint source pollution loadings to th? pollution reduction coals of Vv3XR’s ilfuskeco-Wind Lakes Priority Watershed Plan arid the gods established r‘cr Lake Denoon. Basins will be prioritized for the implemcntarion of non-stmctural and strucrure management prac!ices. 1 - 5. DEVELOPALTERVATWES 0 5.1 Solve Existing Flooding Problems - List existing system deficiencies and suggested repairs for. Flooded Structures and Intersections, Stream Bank and Channel Erosion. and 9 Undersized Primary Culverts and Starm Sewers. Alternatives will be evaluated IO reduce, miriga!e 0: e!iminare iden;iiled drzimge 2nd flooding prob!ems in the study area. dtemarives may inc!uae centralized versus decentralized srcrage, chamel enclosures, and enlargins storm sewers. channel cioss secrions, cul\,erts and bridg:: cZn\e)anc,- capacity. 5.2 Prevent Future Flood Problems Identify constricrions in the system and IOU' areas thx will be adverjely affx!d by :he ir.:;e?seS: runoif from new development. Kecomnend improvemenx to :he sysrsm tc accomrnodzte tI1c increased runoff. As an alternative to the ciry incurring ihe costs for nw d?\:?!cpmen:, recommendations will be made for facilities. such as derenricn. that cmld be constmc1-A -4 dfl-Slt$. ;it the developer's expense. IO decrease pollutant loads and floodicg problcns. 0 5.3 Emergencj Flood Water Corridor Preservation Develop recommendations to preserve valuable clrainase Ivays. green ~ays 2nd we!!ar.& 6r tr.r storage and conveyance ci flood U'mr to provics relief ;3 the collec:ion 2r.d c6nve:Jar.c: s:;jTcr,: constructed and maintained by the city. These arezs will aim be integrated into the devel,-?ment cf a comprehensive plan to improve stormwater qualiry and wi!dliie habitats. 5.4 Anrlye/Select Best .Management Prnctices (BRIPs) to Control Pollutants Develop and recormend BbPs in series to maximize the removal of pollutants ar the leist cost :o the city This is commonly referred to as the "Tre?rment Train" concept. EnFnasis c? miti?!e BMPs will be mzde in basins and subbasins identified as "critical". such as commercici :re35 .A rcreznin: process will select BbPs that most cost-effectively meet the water quality objec:i;,ej cf:k project. The analysis will include reconunendations for agriculiural BWs on the fif?etn farm anaiyze:! unde. Task 4.4. 5.5 Site BhIPs Review recommended BbPs for cost, cc?nstructaSility and compatibility with existing and proposed land uses. Criteria used by the landscape architect, engineers. 2nd other prqiecr staff (both CiLy. Districr, and WDNR) in this review include: Docs the BMP fit within rhe limits of available space?. Does the BMP perform its intended function?. Public safety, Aesthetic value, and * City/District;WDNR cost contributions. 5.6 Propose Local Ordinlrnces Suggest modifications to the current city ordinance based on a review of the information from the drat Waukesha County Stomwater Zllanagement ordinance, the State’s model ordinance and specific recommendations of this plan. Discuss in the Stormwater Management Plan existing regulations affecting stormwater management in the study area and the proposed local stormwater ordinance. Current city ordinances will be reviewed and proposed additions andior modificarions wili be developed Rust %obtain legal opinion for the prcposed ordinance ircm an attorney under contract with Rust. \ w;,\ -t‘ 5.7 Prepare Draft Stormwarer Ma~tagement Guide 0 prepare a municipal Stormwater Management Guide, The guide will outline to potential developers the steps to be followed in order to comply with tht proposed srmnwater ordinance and the recommendations of the stormwater management plan. Tools such as a checklidworksheet 10 be filled our by new developers in the city will also be proposed. (, r~q~jnrrs) 5.8 Recommend .Oper~tio~~/~llaintenanee Improvemellts Recommend changes and associated costs to the existing maintenance program of the city’s stormwater management system to: Improve water quality. 0 Extend the life of existing facilities. Maintain system capacity and performance. Schedde long-term capital improvemenrs. and Avoid construction of costly infrastrucrure. 6, CONCL LSIONS AND RECOIWIENDA TfON! 6.1 Develop Implementation Plan ,a Develop a multi-year Implementation Plan which incorporates the recommendations from previous tasks. The main objective of the Implementation Plar. is to tevelop a phased implemen1arion ofthe 0 plan elements, such as programs, jtzfins, projects, and ordinvlces as needed to provide rhe desired level of service. The Implementztion Plan shall: Octline 2 step-by-step scheduie for implementation ofplan e!e!nen:s, * Suggest a responsible agency that should take the lead to implement each pian e!ement, Identify legallreylatory hurdles which must be overcome. 8 Incorporate issues into a tbture public education program, Estimate the cost of implementatiodconstrction, and 0 Suggest potential sourcc(s) ofrevenue for funding plan elements. 6.2 Financing Strategy Development Develop a financing strategy to identify f2ir and equiteble methods of ailocating :he costs of administration, operation and maintmancr, and capital improvelrienrs ofthe src.mwarer manasement program. .4 description of alternrtive funding mechanisms for stormwa!er rnanzgement will be dwe!oped for the City of Muskego. Revenue sources currently being used by ;he :it? ro fund its stormwarer management program will be described. In addition, a dzscsption of revenue sources that could Dorentidv be used to finance portions of the city's stormwater nmayemcnt program will be included. Prioritize recommended improvements. A summary of the alternative financing mechznisms will Includ:: Available financing alternatives, 0 Purposes for which the revenues may be used, and Ranking cf each altemarive based on the financial capability ar,d hsibility Fundins alternatives which may be iiiscussed include: m Stormwater Utility, State Grants, Fee-in-Lieu of Charges, Special .4ssessments. Impact Fees. Taxing Districts. and Bonding. 7.0 DELIVERABI-ES 7.1 Draft an Final Report Chapters Prepare a Stormwater hlanagemenr Plan repon rhat summarizes red;s ofthe :e;hnical analysis and documents the overall planniny'evaluation process As phpses ofrhe Storxw~e: bianaEement Plan are completed, the city and citizen advisory c3mrnittee will receive draft re?crr chapters to review This keeps the city md committee informed throug!out the prcjezr and alloxs for a more relaxed and thorough review oithe report e The report will document the goals, objectives and policies ofthe stormwater management plzn. 11 \dl describe the structural, organizational 2nd hanckl procans and needs The report will describe recommended structural and r,onstmctural improve:r.ents that should bi: take2 to correct the deficiencies. Finally, it will explain how the ciry can inpienen1 the recommendations by identifvil1z a schedule, responsibilities of individuzls, and mecha~srn for fhding. Copies of the Draft Stormwater Management Plan will be provided to the Committee. Fifiy (X) copies of the final Stomwater Planning Repon will be provided wirhin ;O days of receipt of final written comments kom the city and WDNR. The ha! deliverable will be produced as two repons: Stormwater Management Plan for Big Muskegc Lake. and Srormwater Management Plan for Lake ,- Denoon. 7.2 Deliver Data Files The database containing the inventov of stonnwattr rnangemeni fxilitizs (pipes, culvens. etc ), land use, soils, and hydrologc parameters nd1 be given to the city in- I. 1 (tabular 4 @computer fils) Also the digiral mapping files will be provided 10 the city. 8.0 MEE TLVCiJ' 8.1 City, WDNR, and Citizen Advisory Cornnlittee Review Xleetings Up to six (6) review meetings will be ccnducted wi!h rhi: \I'D?% city. and citizen adviscn, committee An agenda will be distributed before each meering identifying topics to be discussed 2nd 0 decisions to be made. 8.2 Report Presenratio~~s Rust vdl make a fomal presentation regarding the final repon and recommendaticns of this planring process. One presentation will be made to ezch of the foliowing groups. the City of Muskegs Common Council, Big Muskego Lake Rehabilitation Disinct, and the Lake Denoon Association. 8.3 Stormwater Ordinance Public Hearings Attend two public hearings for the adoption of the stomwater ordinance. .hs\-er questions regarding the ordinance, irself and the need for the ordinanc:. ;iL xyo i It ............. I ,: .L ....... I I 6 I I I I I I I I I I I I I t I 1. 1.1 2. 2.1 2.2 Iniroduction Develop Project Work Plan Develop a Project Work Plan leading to a quality product through mutually agreed upon project objectives, procedures, and milestones. Quality, for Rust, meansrneeting our clients’ requirements. Our project team leaders will meet with the city, the Citizen Advisory Committee, and the WDNR to define project success factors (goals) and procedures which will incorporate these success factors. Factors to consider when developing these goals may include: + Project schedule and milestones, + Lines of communications, and + Deliverables. Project Goals and Objectives, and Public Interaction Interact witb Citizen Advisory Committee The city will build on the Citizen Advisory Committee developed in the Phase I stormwater management project. This committee has proven to be effective in exchanging information regarding local needs, perceptions, and goals, and in enhancing the “usability” of the final product. The main objectives of public involvement through this committee are: + Determine citizens’ concerns relevant to stormwater management issues, + Obtain information on local conditions, + Inform citizens about stormwater management issues and water quality impacts in the City of Muskego, and obtain support for the stormwater management plan. Define Goals, Objectives and Policies Build consensus to identlfy the goals, objectives, and policies of the city’s Stormwater Management Program that meets the needs of the City of Muskego, the Muskego- Wind Lakes Priority Watershed Program, and the Wisconsin Lake Management Planning Grant Program This process wiU include meetings with the Citizen Advisory Committee and will build upon the information and results generated in Phase I and from this investigation. The goals will be based on the Big Muskego Lake drawdown project; the Muskego- for Lake Denoon. WindLake Priority Watershed Plan, and the water quality objectives to beestablished Established goals, objectives, and policies will be further used to iden@ and prioritize stormwater management needs for the project area. C Page + 1 3. Define Project Area 3.1 Collect Available Data 3.2 Drainage System Inventory 3.3 Delineate Draiyage Basins 3.4 Survey Culvert Elevations Collect, review, and evaluate available information relevant to the development of a Stormwater Management Plan for the study area. Pertinent information includes flood maps, aerial photography, hydrologic and hydraulic design criteria for existing record drawings, surveys and design reports, present and projected land use and proposed developments. ordinances, plans, topographic maps, stormwater system records, practices and procedures, historical flooding information (both verbal and information, soils information, geologic information, operation and maintenance written), and other such applicable information. This information will be obtained through meetings with appropriate city officials and other agency staff. The system inventory will make use of existing available inlormation and lield inspections. The objectives of the inspection are to: 4 Confirm and identify necessary information, 4 Determine the physical condition of facilities. 4 Identify maintenance requirements, and 4 Confirm drainage patterns and divides. Additional field surveying is proposed under Task 3.4. Delineate drainage basins and sub-drainage basins within the study area using available topographic maps, storm sewer maps, and aerial photographs. Drainage basins and sub-basins will be used to evaluate and define “critical areas’’ based on water quality impacts and hydrologichydraulic capacity needs. Inventory of nalwal and constructed drainage system fealures. possibly useful for detention as quality/ quantity control measures, will be prepared in narrative tabular and graphic forms. Using Rust’s Global Position Survey (GPS) equipment. key culverts identified in Task 3.2 will be surveyed. Preliminary investigation of USGS maps and field observations indicate that approximately 55 culverts will be surveyed. Thc culverts will be located. upstream and downstream invert elevalions determined, length and diameter measured, and pipe material noted. All of this dala will be entered into a database system to provide a comprehensive record for the city files. provide additional information on the Also, each site will be photographed to condition of each culvert Page 2 3.5 Assess Land Use Map existing and future land use for the project area. Existing and future land use will be determined based on available land use data from the city, county and/or SEWRPC, and from discussions with the city. Aerial photographs, zoning maps and . .& field surveys will also be used to refine and update existing land use in the watershed. 3.6 Inventory Soils LEI Map hydrologic soil classification for each subbasin using the U.S. Department of Agriculture Soil Conservation Service Soil Survey Report for Racine and Waukesha Counties. Special emphasis will be placed on each soil’s potential to impact stormwater management facilities such as detention basins, infiltration and exliltration systems. Significant Areas .<” Map wetlands, floodplains, andother environmentally sigruficant communitieswithin the study area using existing sources (maps and digital files) from the city, county, WDNR andor SEWRPC. 4‘ 3.7 Identify Environmentally ’ 9 bW 3.8 Summarize Water Quality Data Analyze and prepare a summary of the existing water quality data for Big Muskego Lake and Lake Denoon. Both lakes have water quality information from one or more of the following sources: WDNR, U.S. Geologic Survey, SEWRPC, andlor local monitoring programs. This information will be reviewed to analyze trends, current conditions, and potential future conditions of the lakes. The water quality data will also be used to help produce project goals. The final reports will document the analysis. Also, a recommended monitoringplanfor Lake Denoon will be developed and included in the Lake Denoon final report. 3.9 Cmate GIS/Database System Create a Geographic Information System (CIS) utilizing the data obtainedfrom Task 3.5. The CIS will be used to manage and process the various levels of data obtained. The data is then used to generate graphics, and produce a database which will form the foundation for the stormwater quality and quantity modeling, and analysis of the existing and proposed stormwater management facilities. The database will contain information such as drainage area, land use, pipe diameter, pipe length, pipe material, channel dimensions, slope, and contributing drainage area. 3.10 Assess Municipal OperationlMaintenance Inventory procedures currentlyused to maintain, inspect, clean and repair stormwater based on existing level of maintenance and inspection of stormwater management management facilities. Evaluate need to change or increase maintenance practices maintenance tasks can produce significant improvements in water quality or reductions system. Rust finds, at times, that inexpensive changes in, or additions to, operation/ in flooding. 4. 4.1 4.2 4.3 4.4 Analyses Calculate Stormwater Flows and Volumes Evaluate Hydraulic Capacity of the Stormwater System Compute Fxisting/Future Urban Nonpoint Source Pollutant Loads Compute ExistinglFuture Rural Nonpoint Source Pollutant Loads Calculate the peak discharge and runoff volumes for existing and future land use. Simulate the rainfall-runoff process for each drainage basin for not only the IO-year and 100-year storm events. but also the 2- and 25-year storm events. The reason for conveyance facilities in terms of not only cubic feet per second (cfs), but also in terms simulating the additional storm events is to determine the capacity of stormwater of the level of service being provided (ie, frequency at which the facility may be over topped). Compare computed runoff rates to the hydraulic capacity of the existing primary stormwater conveyance system. The information obtained in Task 3.4 will be insmmental in providing accurate data to conduct the required analyses. Determine thedrainage and flood protecuon level ofservice provided by theexisting stormwater management system. Identify deficiencies in the capacity of the existing stormwater system. Recommend improvements to tacilities that are determined to be unable to handle existing and future runoff conditions. Estimate nonpoint source pollulanl loadings for each basin and sub-basin with urban (residential, commercial, or other developed land use) using SLAMM (Source Loading and Management Model). The pollutants to be analyzed will include sediment, phosphorous and heavy melals. Estimated loadings will identify "critical" areas (e.g., areas that are the highest sources of nonpoint source polluuon) that will be targeted for the use of structural and non-smctural BMPs. The SLA" model will also verify the effectiveness of he proposed BMPs. SLA" is not an appropriate tool to model pollutant loads from rural (agricultural) lands. Since much ofthe runoffconlribuling land to the project area is in agricultural land use, other methods must be employed. Rust will work with the WaukeshaCounty Land Division 10 obtain rural inventory results from the Muskego-Wind Lakes priority watershed planning process. The data will be updated based on county records. The updated data will be used to develop pollutant loads from upland erosion, animal waste runoff. and channel (or streambank) , i, ,, erosion. These I:.,''.' 4.5 Critical Basin Loadings Identlfy critical sources of nonpoint source pollution. A comparison will be made of the estimated ~al and urban nonpoint source pollution loadings to the pollution reduction goals of the Muskego-Wind Lakes River Priority Watershed Plan. Basins will be prioritized for the implementation of non-structural and structure management practices. 5. Develop Alternatives 5.1 Solve Existing Flooding Problems List existing system deficiencies and suggested repairs for: + Flooded structures and intersections, + Streambank and channel erosion, and + Undersized primary culverts and storm sewers. and flooding problems in the study area. Alternatives will include centralized versus Alternatives will be evaluated to reduce, mitigate or eliminate identified drainage decentralized storage, channel modifications, and enlarging storm sewers, channel cross sections, culverts and bridge conveyance capacity. 5.2 Prevent Future Flooding Problems Identify constrictions in the system and low areas that will be adversely affected by the increased runoff from new development. Recommend improvements to the system to accommodate the increased runoff. As an alternative to the city incurring the costs for new development, recommendations will be made for facilities, such as detention, that could be constructedon-site, at the developer’s expense, to decrease pollutant loads and flooding problems. 5.3 Emergency Flood Water Corridor Pmservation c Develop recommendations to preserve valuable drainage ways, greenways and wetlandsfor the storage and conveyance offlocd water to provide reliefto thecollection and conveyance system constructed and maintained by the city. These areas will also be integrated into the development of a comprehensive plan to improve stormwater quality and wildlife habitats. 5.4 AnalyzelSelect BMF’s to Control Pollutants Develop and recommend BMPs in series to maximize the removal of pollutants at the least cost to the city. This is commonly referred to as the “Treatment Train” concept (see figure next page). Emphasis on multiple BMPs will be made in basins will select BMPs that most cost-effectively meet the water quality objectives of the and subbasins identified as “critical”, such as commercial areas. A screening process project. The analysis will include agricultural BMPs that may be applicable to the project area. Also critical land acquisition will be evaluated as a potential management I Stormwater Management "Treatment Train" Implementation Technique Staff Training Housekeeping PesticidesIFertilizer Control and Education/ Information Minimize Impervious Area Filter Strips Building Requirements Swales Subdivision/ Infiltration Basins - ~~ ~~ Development Stormwater Management Ordinance Wet Detention Regional Capital Improvement Program IMuskego-Wind Lakes IMI ".- Page + 6 I Proposal for Stormwater Management Plan, Management Guide and Ordinanc 5.5 Site BMPs I I I 5.6 Propose hcal Ordinances I I b 5.7 Prepare Draft Stormwater Management Guide 1 5.8 Recommend Operation! Maintenance ImDrovements I I Review recommended BMPs for cost, constructability and compatibility with existing and proposed land uses. Criteria used by the landscape architect, engineers, and other project staff (both city, District and WDNR) in this review include: 4 Does the BMP fit within the limits of available space?, 4 Does the BMP perform its intended function?, 4 Public safety, 4 Aesthetic value, and 4 City/District/wDNR cost contributions. Urban and agricultural recommendations will be presented in the final report and graphically displayed in a project map. Suggest information from the draft Waukesha County Stormwater Management ordinance and the State’s model ordinance that co,uldpe integrated with specific recommendations of this plan. Prepare a chapter in theXtormwater Management Plandiscussing existingand proposedregulations affecting stormwater management in the study area and the proposed local stormwater ordinance. Current city ordinances will be reviewed and proposed additions andor modifications will be developed. Rust will solicit legal opinion for input to the stormwater ordinance. Prepare a chapter in the Stormwater Management Plan describing the items to be outline to potential developers the steps to be followed in order to comply with the included in the development of a Stormwater Management Guide. The guide will proposed stormwater ordinance and the recommendations of the stormwater management plan. Tools such as a checklidworksheet to be filled out by new developers for the city will be proposed. Recommend changes and associated costs to the existing maintenance program of the city’s stormwater management system to: 4 Improve water quality, 4 Extend the life of existing facilities, 4 Maintain system capacity and performance, 4 Schedule long-term capital improvements, and 4 Avoid construction of costly infrastructure. Page 7 6. Conclusions and Recommendations 6.1 Develop Implementation Plan Develop a multi-year Implementation Plan which incorporates the recommendations from previous tasks. The main objective of the Implementation Plan is to develop a phased implementation of the plan elements, such as programs, staffing, projects, and ordinances as needed to provide the desired level of service. The Implementation Plan shall: t Outline a step-by-step schedule for implementation of plan elements, t Prioritize recommended improvements, t Suggest a responsible agency that should take the lead to implement each plan 4 Identify IegaVregulatory hurdles which must be overcome, t Incorporate issues into a future public education program, t Estimate the cost of implementatiodconstmction, and t Suggest potential source(s) of revenue for funding plan elements. element, 6.2 Financing Strategy Development Develop afinancing strategy to idenufy fair and equitable methods of allocating the costs of administration, operation and maintenance, and capital improvements of the stormwater management program. be developed for the City of Muskego. Revenue sources currently being used by the A description of alternative funding mechanisms for stormwater management will city to fund its stormwater management program will be described. In addition, a description of revenue sources that could potentially be used to finance portions of the city's stormwater management program will be included. A summary of the alternative financing mechanisms will include: + Available financing alternatives, t Purposes for which the revenues may be used, and t Ranking of each alternative based on the financial capability and feasibility Funding alternatives which will be discussed include, but are not limited to: t State grants, t Stormwater utility, t Fee-in-lieu of charges, t Special assessments, t Impact fees, t Taxing districts, and t Bonding. 7.0 Deliverables 7.1 Draft and Final Report Chapters Prepare a StormwaterManagementPlan report that summarizesresultsof the technical analysis and documents the overall planning/evaluation process. Rust proposes to smcture the Stormwater Management Plan to satisfy the requirements of the "needs analysis" to establish either an impact fee or special assessment for the construction of stormwater facilities. As phases of the Stormwater Management Plan are completed, the city and Citizen and Committee informed throughout the project and allows for a more relaxed and Advisory Committee will receive draft report chapters to review. This keeps the city thorough review of the report. The report will document the goals, objectives and policies of the stormwater programs and needs. The report will describe recommended structural and management plan. It will describe the structural, organizational and financial nonstructural improvements that should be taken to correct the deficiencies. Finally, it will explain how the city can implement the recommendations by identifying a schedule, responsibilities of individuals, and mechanism for funding. CopiesoftheDrafl StormwaterManagement Plan will beprovidedto the Committee. Fifty (50) copies of the final Stormwater Planning Report will be provided within 2(! days of receipt of final written commenk from the city. The final deliverable will be Stormwater Management Plan for Lake Denoon. produced as two reports: StormwaterManagement Plan for Big Lake Muskego and 7.2 Deliver Data Files The database containing the inventory of stormwater management facilities (pipes, a format which they choose (tabular or computer file). manholes, etc.), land use, soils, and hydrologic parameters will be given to the city in 8.0 Meetings 8.1 City, WDNR and Citizen Advisory Committee Review Meetings Up to 6 review meetings will be conducted with the WDNR, city, and Citizen Advisory Committee. An agenda will be distributed before each meeting idenbfying topics to be discussed and decisions to be made. 8.2 Report Presentations Rust will make two formal presentations regarding the final report and recommendations of this planning process. These meetings will be made to the Muskego Common Council, Big MuskegoLakeRehabilitationDistrict, and theLake Denoon Lake Association. 8.3 Stormwater Ordinance , Public Hearings Attend two public heanngs regarding the stormwater ordinance. Answer questions x. regarding the ordinance, itself and the need for the ordinance.