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1a 2004 Street Improvements ProCITYOF CHANHASSEN 7700 '~arke! Bn'J evard PO Box 147 O~ar~hasser~ MN 55317 Administration Pgne 9522271100 Fax 9522271110 Building Inspections PI)n,~ 952 2271180 Fax 952 227 1190 Engineering Pr"~ne !}52 227 !!50 Fix 952227 !170 Finance P']oi:v 952227 !!40 Fax 952227!110 Park & Recreation Phc'it: 952227 1!20 F~x 952 227 1!10 Rocreaiion Oenter 23!0 Ccuit(}~ Bo~J!evard Phon~ 952227 1400 Fax: 9522271404 Planning & Natural Resources Phc' ~e 952 2271130 Faxz 9522271110 Public Works 1591 Park Road P~'one 952227 1300 Fax 952 2271310 Senior Center Phone: 952227 1125 Fax: 9522271110 Web Site ~w¢, c ',:nan%ssen mn MEMORANDUM TO: Todd Gerhardt, City Manager FROM: DATE: Teresa J. Burgess, Public Works Director/City August 19, 2003 SUB J: Receive Feasibility Studies and Call for Public Hearings for 2004 Street Improvements, Project 04-01 & 04-02 REQUESTED ACTION Receive the Draft Studies and Call the Public Hearings for the 2004 Street Improvements and call thc Public Hearings for September 22"d. DISCUSSION Attached are the draft feasibility studies for the 2004 Street Improvement Projects. Please note, these studies are considered in draft format until the Public Hearing, so revisions should be expected as Staff and Resident comments are incorporated. An Open House will be scheduled to allow the neighborhoods an opportunity to review the report, ask questions, and comment. The feasibility studies will also be posted on the City web-site and be available at City Hall during normal business hours roi' viewing in the two weeks prior to the Public Hearing. Staff will be available to answer questions and take comments. Staff is still working to finalize the preliminary assessment rolls. Preliminary assessments will be discussed on September 8th kit the City Council Worksession. FUNDING The Feasibility Studies include a section on funding of the projects. c: Matt Saam, Assistant City Engineer I:\ENG\TEP, ESA\staff reports\staff rClXXt feasibility reports 8-25-03.doc FEASIBILITY REPORT FOR Santa Fe Trail Neighborhood City Project 04-01 2004 Residential Street Improvements Chanhassen, Minnesota Seotember 2003 I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. Mark Statz, P.E. Date: September 8, 2003 Rcg. No. 42717 Table of Contents Table of Contents ............................................................................................................... l I. Introduction/Summary ................................................................................................ 2 Figure I - Location Map ...................................................................................... 3 II. Proposed Improvements .............................................................................................. 4 III. Cost Analysis / Financing ........................................................................................... '7 Table I - Estimated Project Costs Summary ...................................................... '7 Table 2 - Proposed Assessment Rates ................................................................. 8 Table 3 - Funding Summary ............................................................................... 8 IV. Project Schedule .......................................................................................................... 9 V. Easements and Permits ................................................................................................ 9 VI. Summary and Recommendations ............................................................................... 10 Figure 2 - Proposed Improvements Figure 3 -Typical Section Figure 4 - Map of Assessment Area Appendix A - Preliminary Cost Estimate Appendix B - Preliminary Assessment Roll Appendix C - Assessment Practice Summary I. Introduction/Summary This report presents information concerning the proposed 2004 Residential Street Improvement Project (City Project 04-01). The project is part of the City's ongoing annual street improvement program. Municipal improvements proposed herein include sanitary sewer replacement, water main replacement, drainage improvements, and street reconstruction. This report was initiated by the City Council on April 23, 2003. The costs of the proposed improvements are detailed in Appendix A. Cost allocation and a cost summary are presented in the Cost Analysis section. Financing for the project will come from assessments, the water fund, the sewer fund, the pavement management fund and the surface water management fund. Assessments proposed in this report are consistent with past projects and Council direction concerning assessment methodology. A copy of the current city assessment practice is attached as Appendix C. The proposed project assessment area consists of 33 lots and is shown on Figure 4. The proposed assessments are based on the preliminary cost estimates and may be revised at the time of the final assessment hearing. HALL LOCATION MAP CHANHASSEN, MINNESOTA 2004 RESIDENTIAL STREET Figure 1 DATE: 08/03 FIGURE 1 IMPROVEMENTS COMM: 395-03-141 Bonestroo Rosene ,~ Anderlik & Associates Engineers & Architects II. Proposed Improvements Sanitary Sewer Repairs in Kiowa, Iroquois, and Huron Area. In April of 2003 the Public Works Department engaged Infrastructure Technologies to complete a television inspection of the sanitary sewer in the neighborhood that includes West 76th St., Chan View, Kiowa, Iroquois, and Huron. Segments of the sewer in this neighborhood were previously lined in the early 1980's. The results of the 2003 television inspection indicate that the sewers in the neighborhood are in poor to fair condition. Specifically, 23 spot locations were identified that need to be repaired soon. The repairs required include repairing cracked pipe, repairing misaligned pipe, removing tree roots, and replacing service wyes. It is proposed to repair these 23 spot locations by excavating them and patching the street. The sewer repairs in this neighborhood are proposed to be included in the 2004 Residential Street Project because of their close proximity to the Santa Fe area and because including the sewer repairs with the larger project should result in better bids. Sanitary Sewer Replacement in Santa Fe and Del Rio Area. The sanitary sewer in the Santa Fe and Del Rio neighborhood has been inspected and been determined to be in unacceptable condition. It is proposed to replace all sanitary sewer in the project area as part of the overall street project. Sewer replacement will include replacing sewer pipe, manholes, and service wyes. Water Main. Existing water main in the Santa Fe and Del Rio area consists of cast iron pipe. street project it is proposed to replace all existing water main with PVC main. existing water main will include replacing all hydrants and valves. As part of the Replacing the Sanitary Sewer and Water Services. Individual sanitary sewer and water services for homes in the project area will be replaced to the right-of-way line as part of this project. Replacement of the sanitary sewer services will include new 4-inch pipe. Replacement of the water services will include new service pipe and new curb boxes. Drainage. Drainage improvements are proposed as part of the overall street project. Short storm sewer laterals will be extended at some intersections to provide better collection of surface drainage. In addition, subsurface draintile will be installed along each side of the reconstructed streets to improve the subsurface drainage and to provide outlets for residential sump pump drainage. Water quality improvements are also proposed as part of the project. Sediment trapping sump manholes and catch basins will be installed where necessary. In addition, water quality "rain gardens" are proposed to be constructed in the center or the two cul-de-sacs (Santa Fe Circle and Laramie Circle). Rain gardens are temporary ponding and sediment removal areas that are landscaped with plants that can withstand the conditions. It is proposed to construct the rain gardens on Santa Fe Circle and Laramie Circle in the middle of the cul-de-sacs as "center islands". Drainage from the rain gardens will be conveyed to the existing storm sewer through subsurface drains and through at surface overflow piping. Street. Street improvements proposed include total reconstruction of Del Rio (between Laredo and Santa Fe), Santa Fe Trail, Santa Fe Circle, and Laramie Circle. The reconstructed streets will be close to the existing street widths. Street construction will include removing the existing street surface, excavation for a new street base, and construction of a new street. The street section will include: · · · 1.5-inch bituminous wear course (2005) 2-inch bituminous base course (2004) B618 concrete curb and gutter · 12-inch Class 5 aggregate base · 24-inch granular borrow · draintile · geotextile fabric (where necessary) Street construction will include driveway repair with in-kind surfaces. In general, driveways will be removed 5 to 10 feet behind the edge of the street to fit in with the new street grade. Concrete driveway aprons will be placed for all driveways, and the area beyond the concrete apron will match the existing driveway surface. Sidewalk. In accordance with city practice for new streets, a sidewalk is proposed for one side of Santa Fe Trail and Del Rio. The sidewalk will consist of a 5-foot wide concrete walk located directly behind the concrete curb. III. Cost Analysis / Financing Cost Estimate The estimated project cost to complete the improvements proposed herein are presented below in Table 1. These costs include construction costs, a 7% contingency cost and an estimated 30% indirect costs: financial (2%), legal (5%), administrative (5%), engineering (18%). The estimated indirect costs are reviewed at the time of the final assessment hearing. This estimate does not include easement acquisition costs. Table 1. Project 04-01 Estimated Project Cost Summary (See Appendix A for Detailed Cost Estimate) Item Sanitary Sewer Spot Repairs Streets and Storm (Rehab) Sanitary Sewer Water Main Streets and Storm (New) Sidewalk Rain Gardens Total Cost $ 117,000 $ 636,500 $ 122,400 $ 151,700 $ 76,000 $ 55,5oo $ 27,800 Total $ 1,186,900 Assessments Assessments are proposed for the benefited properties as shown on Figure 4. A Preliminary Assessment Roll is presented in Appendix B. The city's assessment practices are attached in Appendix C. The proposed assessments herein are consistent with past practice and previous City Council direction concerning assessment methodology. A summary of the proposed Assessment Rates is presented in Table 2 below. The assessment rates are based on 33 total parcels and the preliminary cost estimates. The table could be revised to reflect front foot based assessments. Item Sanitary Sewer Spot Repairs Streets and Storm (Rehab) Sanitary Sewer Water Main Streets and Storm (New) Sidewalk Rain Gardens Total Per Parcel Assessment Table 2. Project 04-01 Proposed Assessment Rates (per parcel) % Assessed Rate 0 $0 40 $ 7,715 40 $ 1,485 40 $ 1,840 100 $ 2,300 100 $ 1,680 0 $0 $15,o2o Funding Summary Item Sanitary Sewer Spot Repairs Streets and Storm (Rehab) Sanitary Sewer Water Main Streets and Storm (New) Sidewalk Rain Gardens Table 3. Project 04-01 Funding Summary Estimated Cost Assessments City Share $ 117,000 $0 $117,000 $ 636,500 $254,600 $381,900 $ 122,400 $48,960 $73,440 $ 151,700 $60,680 $91,020 $ 76,000 $76,000 $0 $ 55,500 $55,50o $0 $ 27,800 $0 $27,800 TOTAL $1,186,900 $495,740 $691,160 Fund Sewer PMF Sewer Water SWMF Area to be Included The area to be assessed for this project is listed in Appendix B and shown on Figure 4. IV. Project Schedule A tentative project schedule is shown below. The project schedule can delayed if the City or neighborhood residents request it. be modified and/or Council Authorize Feasibility Report Staff Review Draft Feasibility Report Council Receive Report & Call for Hearing Public Hearing Order Preparation of Plans and Specifications Approve Plans & Specs, Authorize Bids Open Bids Assessment Hearing Award Contract Begin Construction Substantial Compl.etion Final Bituminous Wear Paving April 23, 2003 July-August 2003 September 8, 2003 October 13, 2003 October 27, 2003 January 12, 2004 February 5, 2004 February 23, 2004 March 8, 2004 May 17, 2004 July 30, 2004 July 2005 V. Easements and Permits Easements for proposed construction will not be required from the adjacent property owner(s). Permits and approvals will be required from the following: Minnesota Pollution Control Agency (sewer and grading) Metropolitan Council Environmental Services Minnesota Department of Health Watershed District City of Chanhassen, Wetland Alteration Permit Preparation of an Environmental Assessment Worksheet (EAW) for the Public Improvements is not required. VI. Summary and Recommendations The total estimated cost for this project is $1,186,900 including both construction and indirect costs, The proposed work is necessary, cost effective, and feasible from an engineering standpoint. The following recommendations are presented for the Chanhassen City Council' l. The City should adopt the report as the criteria for installation of the improvements contained herein. 2. The City should review and adopt the proposed assessment and financing methods contained herein. A formal public hearing should be held to discuss the proposed improvements and assessments. All properties that are proposed to be assessed and all properties within 500 feet of the project area will be notified of the public hearing. UTILITY W~ORK - WATER~ MAIN iREPLACEMENT - SANITARY SEWER' R.EPLA'CEMENT - STORM ~S,E.,WE,~ REPLACEMENT ...... = ADDITIONAL STORM SEWER RAIN GARDENS IN CENTER OF C-D-S STEET WORK - NEW__B6.]..8 CURB AND GUTTER - STREET Wi[~'?H'S~'TOTREI~AiN"-THE' SAMF ~OR'~SLIGHTLY~'WlDER - STREET SECTION PER CITY STANDARD +1- FABRIC WHERE NEEDED SAN` ~TARY SEWI~R SP6T ' REPAilR$ .......... PROPOSED IMPROVEMENTS CHANHASSEN, MINNESOTA FIGURE 2 2004 RESIDENTIAL STREET IMPROVEMENTS Figure 2 DATE: 08/0.3 COMM: 593-05-141 Bonestroo Rosene jAnderlik & Associates Engineers & Architects PL 4" PPE --1 DRAIN'LE~ & . Surrneuntablc, _~ Concrete Curb 25' V~ABLE to Back mm. · -- Wear Course to be 1/2" Above Edge of Gutter CL 25' PL "' · VARt~BLE " ..1.E,'~' to Back ~2'0% ~' , ~1~~- 5 SIDEWALK - 1 ~/2"-Plant Mixed Bituminous Wearing Course Type #41WEA50055B T~ck Co~t - 2357 2"-Plant Mixed Bituminous B~se Course T~e ~31BBB50000B 12"-Cless 5 AggregQte Base, 100% Crushed 24" MNDOT 3149.2B Select Granular Borrow (See Note 7) GEO~X~LE FABRIC 1. Right-of-Way Required - ~0'. 2. Maximum street grade 7.0~ 3. Minimum street grade 0.75~ 4. 4.0" Topsoil placed in disturbed areas. 5. 2 Roll;3 ;3od behind curb. SOD ALL DISTURBED AREAS. 6. The bituminous wearing surface shall be placed the next construction season following placement of the bituminous base. 7. A test roll of the prepared subgrade shall be performed by the owner in the presence of a city inspector. The city has the authority to require additional subgrade correction or to reduce the requirement of 24" MNDOT Select Granular Borrow to 12" based on the test roll. CITY OF TYPICAL RESIDENTIAL STREET SECTION REVISED:2-97 , 2-01 DATE: FILE NAME: 39.3_5200 PLATE NO.: 52OO *ITALICS /ND/CA TE CHANGES TO CITY'S STANDARD DETAIL PLA TE TYPICAL SECTION CHANHASSEN, MINNESOTA FIGURE 5 2004 RESIDENTIAL STREET IMPROVEMENTS Figure 5 DATE: 8/03 COMM: 593-05-141 Bonestroo Rosene Anderlik & ~ Associates Engineers & Architects DEIJ RIO ~--AREA TO BE ASSESSED--..............~TA F~ TRAIL MAP OF ASSESSMENT AREA CHANHASSEN, MINNESOTA FIGURE 2004 RESIDENTIAL STREET IMPROVEMENTS Figure 4 DATE: 08/03 COMM: 393-03-141 Bonestroo Rosene ,~ Anderlik & Associates Engineers & Architects Appendix A Preliminary Cost Estimate 0['966'9~$ O0'£gg'~$ O0'OOI'~g$ O0'O00'Og$ 00'00U£$ 00'008'95 00'009'65 0()'0~£'~$ 00'0gUP$ 00'00~$ O0'O00T$ 800~/6~/Z 00'()00'i55 00'9£5 oo'ks$ 00'9[$ o~'~$ og'r$ 00'00~$ O0'00075 aa!ad l!ufI ~Dt 009 AD (AD) g SSVqD 'EISV~t Et£V©3HDDV $ $ OOg~ Hq ~LNHIN~tAVd gflONIINDJJ[t DNIASV5; $ $ OOLI AS £NEIIAI~AVd SflONIIA!£1£I[t zAAOIAI::A~t $ Sq qO~tJ. 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S3/SO9 AI:JVNIIAII-I:::Ibtd 8~BUJ!I,S:q iSO~ 01-¥ sl×'V :qpupddv 00'006'98I'I$ O0'O0S'L~:$ O0'OOS'SS$ 00'000'9L$ O0'OOL'H;I$ O0'OOV~:i:I$ 00'00~;'9t;95 O0'O00'LII$ gOOg/6g/z aa!ad ;!u fl ~I~t o~!ad lelO& aa!ad ;!u fl KIO sl!ufl SINBIAI3AOEdlAII J_3:IEI.LS q¥11NqQISEbt ffOO8 EIIVIAIIIS3 1SOO AIBVNIIAII-lqHd · ] APPENDIX B Preliminary Assessment Roll APPENDIX C City of Chanhassen Assessment Practice CITY OF CHANHASSEN ASSESSMENT PRACTICE rlhis Assessment Practice is i~tended to provide direction to City Stq[f in preparation of assessment roles to e~*st,'e fitir a~d eonsistent treatme~t o fall properties withb~ the City of Chanhassen. MAINTENANCE: (Pothole.filling, Patching, crack sealing, seal coat) Maintenance costs are not assessed to abutting property owners. Maintenance costs are financed through the City's Annual Budget process. REHABILITATION: (Repair of problem areas to fidl depth, Milling ~f cdge or fidl width of existi~g pavement, Repair to existing catch basins a~M/or curb and gutter, Pave,tettt Overlay) Rehabilitation costs are assessed using the following formula: Total Project Cost = 60% Paid by City (City share may be MSA, General Fund, TIF, Federal or State Grants, etc.) 40% Assessed to abutting Property Owners Residential properties that abut collector or commercial streets shall be assessed using the same formula, however, the assessments shall be reduced to be equivalent to a typical 31' residential street section. RECONSTRUCTION: (Removal of existb~g street a~d co~strt~etio~ of new street,. May inch~de sa~itar3, sewer or watermain work, May recrcle the existi,g asphalt as gravel base) Reconstruction costs are assessed using the same formula as Rehabilitation. NEW CONSTRUCTION: (('onstr~ctio~ qf t~e~ street or utilities or a sigmifica~t upgrade.fi'om the previot~s facilities, i.e. a 4-lane street replaces an e¥istb~g 2-1a~e. ) New Construction will be assessed 100% to the benefiting properties. NOTE: If a feature (sanitary sewer, water, curb and gutter, etc.) that did not previously exist is added during a rehabilitation or reconstruction, the cost of that item is treated as new construction with the remaining project costs being treated as rehabilitation or reconstruction. WORK DONE BY CITY CREWS: Work done by City Crews may be maintenance, rehabilitation, or new construction. This work is not typically assessed. Exceptions would include work associated with an assessment agreement signed by the property owner and approved by the City Council and work specifically authorized by the City Council to be done by City Crews and assessed to the abutting properties. g:\cng\forms\asscssmcnts\asscssmcnt practices.doc Report on Feasibility 2004 MSA Street Improvements Chanhassen, Minnesota City Project No. 04-02 SEH No. A-CHANH0308.00 August8,2003 2004 MSA Street Improvements Report on Feasibility Chanhassen, Minnesota City Project No. 04-02 SEH No. A-CHANH0308.00 August 8, 2003 i hereby certify that this report was prepared by me or under my direct supervision, and that I am a duly Licensed Professional Engineer under the laws of the State of Minnesota. Signature Date Jason P. Sprague, P.E. Printed Name 25065 Registration No. Reviewed by: Mike Foertsch, P.E. Date: Short Elliott Hendrickson Inc. 100 North 6th Street, Suite 710C Minneapolis, MN 55403-1505 (612) 758-6700 August 8, 2003 RE: 2004 MSA Street Improvements Report on Feasibility Chanhassen, Minnesota City Project No. 04-02 SEH No. A-CHANH0308.00 Honorable Mayor and City Council City of Chanhassen 7700 Market Boulevard P.O. Box 147 Chanhassen, Minnesota 55317 Attn: Teresa Burgess, City Engineer: Short Elliott Hendrickson Inc? (SEH) is pleased to present the completed feasibility study for the 2004 MSA Street Improvement Project. The feasibility report has been based upon criteria identified by City stall; and the enclosed recommendations are based upon those criteria. We will be available at your convenience to discuss and present the contents of this report. Sincerely, Jason P. Sprague, P.E. Project Manager u ,civil'projects chanhassenX,0308 00\Fc.~ibility Repro1%26 03 doc Table of Contents Title Page Certification Page Letter of Transmittal Table o [' Contents Page 1.0 Conclusions and Recommendations ......................................................... 1 1.1 Conclusions ........................................................................................... 1.? Recommendations ................................................................................. 2 2.0 Introduction .................................................................................................. 3 2.1 Background information ......................................................................... 3 3.0 Existing Conditions ..................................................................................... 5 3.1 Pavement ............................................................................................... 5 3.2 Sidewalks ............................................................................................... 5 3.3 Right-of-Ways and Easements .............................................................. 6 3.4 Drainage ................................................................................................ 6 3.5 Utilities ................................................................................................... 7 3.6 Concrete Curb and Gutter ...................................................................... 8 4.0 Criteria for Investigation ............................................................................. 9 4.1 Criteria ................................................................................................... 9 4.2 Permits ................................................................................................... 9 5.0 Proposed Improvements ............................................................................. 10 5.1 Pavement ............................................................................................... 10 5.1,1 Market Boulevard ................................................................................... 11 5.1.2 5.1.3 5.1.4 Great Plains Boulevard ........................................................................... 11 West 78th Street ...................................................................................... 12 West 79th Street ...................................................................................... 12 5.1.5 South Shore Drive/South Shore Court ................................................... 13 5.2 Sidewalk ................................................................................................ 14 5.3 Rights-of-Ways and Easements ............................................................ 14 5.4 Drainage ................................................................................................ 14 5.4.! Market Boulevard ................................................................................... 15 5.4.2 Great Plains Boulevard ........................................................................... 15 5.4.3 West 78th Street ...................................................................................... 15 5.4.4 West 79th Street ...................................................................................... 16 5.4.5 South Shore Drive/South Shore Court ................................................... 16 5.5 Drain Tile ............................................................................................... 17 SEH is a registered trademark of Short Elliott Hendrickson lnc, Feasibility Report for Project No. 04-02 City of CrystalChanhassen SEH No. A-CHANH0308.00 Page Table of Contents (Continued) 5.6 Utilities ................................................................................................... 17 5.7 Concrete Curb and Gutter ...................................................................... 18 6.0 Implementation ............................................................................................ 19 6.1 Estimated Project Costs ......................................................................... 19 6.2 Proposed Financing ............................................................................... 20 6.3 Assessment Practice ............................................................................ 20 6.3.1 Maintenance ............................................................................... 20 6.3.2 Rehabilitation .............................................................................. 20 6.3.3 Reconstruction ............................................................................ 20 6.3.4 New Construction ........................................................................ 21 6.3.5 Work Performed by City Crews ................................................... 21 6.4 Proposed Assessments ......................................................................... 21 6.5 Future Maintenance ............................................................................... 21 7.0 Schedule ....................................................................................................... 22 7.1 Project Schedule .................................................................................... 22 8.0 Project Contacts .......................................................................................... 23 Figure 1 - Figure 2 - Figure 3 - Figure 4 - Figure 5- Figure 6 - List of Figures Street Summary Storm Sewer Summary Drain Tile Summary Curb Summary MSA Street Reconstruction - Typical Section Local Street Reconstruction - Typical Section Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page ii Table of Contents (Continued) List of Appendices Appendix A Estimated Project Costs Appendix B Mock Assessment Roll Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page iii Report on Feasibility 2004 MSA Street Improvements Chanhassen, Minnesota 1.0 Conclusions and Recommendations 1.1 Conclusions Based upon current investigation in the concluded that: study area, it has been The streets in the study area have/tot outlived their functional life and do not require full reconstruction. However, they do require a significant amount of maintenance to extend the serviceable life of the respective roadways. The present age of the roadway, proposed traffic volumes, and natural weathering factors indicate that a mill and overlay should be performed on Market Boulevard, Great Plains Boulevard, West 78th and 79th Streets, and a full-depth reclaim be performed on South Shore Drive/Court. Surface drainage and groundwater flow problems exist at several locations in the project area, and are addressed within the context of this report. Sporadic concrete curb and gutter replacement and catch basin reconstruction is necessary throughout the entire project area, while a drain tile system is only proposed in the South Shore area. There is adequate pedestrian access throughout a majority of the project area. However, 5-foot sidewalk connections are proposed on the east-side of Market Boulevard between Highway 5 and West 7 9th Street a nd o n t he w est-side o f Great Plains Boulevard between West 79th Street and the existing sidewalk to the north. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 1 1.2 4. Valley gutters are proposed to facilitate improved drainage at driveways and/or intersections with relatively flat grades. SEH has identified locations where the existing concrete curb and gutter has deteriorated to a condition that warrants removal and replacement due to frost heave, settlement, snow plow impacts, etc. 6. The improvements are necessary, cost-effective, and feasible. Recommendations It is recommended that: 1. The report be reviewed by the City Council, staff, and financial advisors. 2. Reconstruction of the streets in 2004 MSA Street Improvements project area proceed at an estimated cost of $1,274,685.78. 3. The project be financed with MSA funds, special assessments, and State Tumback funds. The City Council pledge MSAS funding of SIM and State Tumback funding of $250,000 to reduce the amount of special assessments to single family/duplex properties in the study area. Meet with adjacent residents and property owners to discuss the existing conditions, such as drainage issues, parking/no parking locations and/or pedestrian access, and identify the proposed improvements. 6. The City continue budgeting funds to finance future street maintenance costs. 7. Construct the improvements as proposed in this report. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 2 2.0 Introduction Background Information A report on feasibility for the 2004 MSA Street Improvements was ordered by the Chanhassen City Council in May 2003. The study area is shown on the following map. The streets included in this study are Market Boulevard (MSA), Great Plains Boulevard (MSA), West '78th Street (MSA and State Turnback), West 79th Street (local street) and South Shore Drive and Court (local street). This project is considered part of the City of Chanhassen's ongoing annual street improvement program. Before initiating this feasibility study, SEH coordinated a detailed work p lan t o outline t he s cope o f t he study. T he work components analyzed in this feasibility study are: 1. Examine the existing condition of the bituminous pavements in the project area. 2. Analyze the existing concrete curb and gutter for cracking and/or settlement and quantify locations where replacement is necessary. 3. Identify 'flat spots' or other locations in the roadway with inadequate drainage which lead to street ponding. 4. Identify catch basin structures that have heaved or settled. Propose reconstruction strategy for these locations. 5. Identify existing sidewalk locations, pedestrian accessibility, and system continuity, and suggest improvements where necessary. Determine locations where safety improvements may be made, such as the addition of surmountable medians, removal of unused access points, etc. 7. Examine the feasibility of installing a drain tile system to serve areas where deemed necessary. 8. Analyze the existing railroad crossings at Great Plains and Market Boulevard and determine if any improvements are necessary. The report figures are located at the end of this report. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 3 Insert Map Feasibility Report for Project No. 04~02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 4 3.0 3.2 Existing Conditions Pavement The streets in the project area were either originally constructed or reconstructed in a span of time beginning in the mid 1970s to the early 1990s. For this reason, the pavement conditions vary from street to street. However, there were no locations in the project area that necessitated complete reconstruction of the roadway. The present pavement surfaces show signs of only moderate deterioration. A site visit to the project area confirmed that a majority of the street pavements are in relatively good condition. SEH analyzed the streets in the project area and used the following conditions and criteria for evaluation: Bituminous pavement is designed to last 25 to 30 years, based upon t he 1 atest construction a nd maintenance procedures used i n the City of Chanhassen. Extensive cracking was not noted in any location within the study area. Such cracking, also identified as 'alligator cracking' is a sign of imminent structural failure and the last step prior to a pothole developing. The streets in the study area only showed signs of minor transverse and longitudinal cracking, a problem easily solved with a proactive maintenance policy. In specific locations, improperly bedded pipes beneath the roadway will result in unintentional 'speed bumps' in the road surface. In these locations, the pipes will need to be excavated and the road reconstructed to provide a suitable driving surface. In some locations, the streets have settled, resulting in 'bird baths' after rainfall or snow-melt events. In addition, the crown of the street has subsided in some locations, allowing surface water runol!T t o flow randomly down the street and not into the gutter. Both of these conditions contribute to more water soaking into the underlying soils through cracks in the surface. The water will subsequently weaken the soils, which will eventually lead to structural failure if not corrected by restoring positive drainage. o Progressively increasing traffic volumes and weathering were other factors that contribute to the ongoing deterioration of the pavement surface. Sidewalks A rather extensive sidewalk system presently exists in the project area. Pedestrian access is provided on at least one side, and in several cases, both sides of the streets. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 5 At present, there are some locations in the project area that are conducive to sidewalk connections and pedestrian flow, however, no sidewalk exists. These areas have been identified on the east side of Market Boulevard between Highway 5 and 79th Street, and on the west side of Great Plains Boulevard from 79th Street north to the existing sidewalk. In addition, there are no sidewalks in the South Shore Drive/Court area. Most sidewalk connections with the streets in the project area utilize ADA-compliant pedestrian ramps for handicapped access. However, the sidewalk on the north side of 79th Street, approximately 600 feet east of Market Boulevard does not presently have pedestrian ramps at the driveway intersections. 3.3 Right-of-Ways and Easements The streets ~vithin the study area are built approximately in the center of the right-of-ways (ROW). The majority of the ROW in the project area is between 70 and 100 feet wide. As a majority of the work proposed in this feasibility study will occur on the existing roadway surface, the ROW corridor will be sufficiently wide for all of the work proposed in this study. 3.4 Drainage Two types of drainage have an impact in the study area. The first type - surface water runoff- results from rainfall or snow melt. The project area relies heavily upon the concrete curb and gutter section to transport water catch basins and on to the adjacent drainage ponds. Unexpected settlements in the curb and flattening of the road profile leads to the creation of 'bird baths' on the road surface where surface water runoff does not reach the intended catch basins. Consultation with City staff and a subsequent field investigation identified the following potential surface water runoff problems: Potential drainage problems due to heaved storm sewer pipe and catch basins near the existing low point on 79th Street, approximately 400 feet east of the intersection with Market Boulevard. 2. Indications of standing water at the intersection of Market Boulevard and Pauly Drive. 3. Several individual low spots in the outside and median gutters on 78th Street between Market Boulevard and Great Plains Boulevard. Feasibility Report for Project No. 04-02 Chanhassen, Minnesota Standing water at the east-side of the 78th Street and Highway 101 intersection. SEH No. A-CHANH0308.00 Page 6 5. Potential ponding in the gutter on South Shore Drive north of the western-most intersection of South Shore Drive and Highway 101. 6. Standing water in the intersection of South Shore Drive and South Shore Court. o Large tributary area draining to the Lotus Lake Park parking lot, in addition to erosion problems at the storm sewer inlet on the northeast comer of the parking lot. The second type of drainage affecting the study area is subsurface or groundwater flow. This is predominantly a problem in the South Shore Drive/Court area. A field investigation of this area in conjunction with interviews conducted with residents in the South Shore a rea h ave indicated t hat se veral homeowners utilize basement sump pumps to minimize ground water problems caused by the high water table and potential underground springs in the area. Upon completing a field investigation oft his area, at least four residences had visible sump pump outlets draining onto the existing roadway, where the water was conveyed by the existing curb and gutter to the nearest catch basin. Many gutters showed signs of water stains, indicating that the outlets are frequently discharging water. At present, we have no soil borings in this area to confirm the elevation of the water table, or the type of soils encountered in the area. 3.5 Utilities The sanitary sewer and water main systems have been in place since the mid 1970s to the late 1980s. Several utility improvement projects have been completed in the project area since the time of their original construction. The existing sanitary sewer throughout the project area is periodically televised, and initial discussions with City staff have indicated no significant issues at this time. There are no known problems with the water main system that needs to be corrected with the street reconstruction. The condition of sanitary sewer services from the main to the houses is not known at this time. Although there have been no issues identified by City staff or property owners at this time. Electric, telephone, and cable TV lines in the study area are mostly buried outside of the street pavement area. There are some overhead utilities in the project area, however, they should not create any problems with any of the proposed improvements identified in this study. Gas mains and services are buried under the street pavement and no significant problems have been identified with these lines. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 7 3.6 Concrete Curb and Gutter A large majority of the concrete curb and gutter on Market Boulevard, 78th Street (west of Great Plains Boulevard), and Great Plains Boulevard is a modified version of B612 (median) and B618 (outer curb). The modified version is different from the typical variety because it has a thicker section of concrete at the top of the curb. A normal B-type curb is six inches thick at the top and eight inches thick at the gutter line. The curb section on the aforementioned streets is approximately 10 inches thick at the top and 12 inches thick at the gutter. This thicker section has provided for additional structural strength as much of this curb section is in very good condition and shows very few mid-panel cracks. However, as found at several locations within the project area, the modified B612/B618 curb and gutter sections have settled/faulted adjacent to a few of the existing catch basin structures on Market Boulevard. The concrete curb and gutter on '78th Street, east of Great Plains Boulevard, and 79th Street, east of Great Plains Boulevard is a standard B612/B618. Although this curb is in relatively good condition, some sections have settled/heaved near the existing catch basins. In addition, a minimal amount of curb has shown signs of mid-panel cracking. The curb on 79th Street, between Market Boulevard and Great Plains Boulevard, and in the South Shore Drive/Court development is a surmountable D-type curb. The curb in both of these locations has shown some signs of minor deterioration and settlement near the existing catch basins. In addition, there is an incomplete valley gutter crossing 79th Street at Great Plains Boulevard. It should also be noted that on both Market Boulevard and Great Plains Boulevard approaching Highway 5, and on 78th Street approaching Highway 101, the concrete curb and gutter section transitions into a B624 type, as is typical on Mn/DOT projects. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 8 4.0 4.2 Criteria for Investigation Criteria The criteria for improvements proposed in this report include: 1. 2. Permits The improvements proposed in this report will pemfit approval from the following agencies: 1. Minnesota Pollution Control Agency District for grading and drainage. 2. Mn/DOT State Aid streets. 3. Twin City and Western Railroad City of Chanhassen standards for street and utility construction. Minnesota Department of Transportation (Mn/DOT) State Aid street standards. City of Chanhassen standard assessment policies. require review and (NPDES) and Watershed Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 9 5.0 Proposed Improvements Pavement The proposed improvements to the pavement sections vary by location for this project. A common preventative maintenance approach for roads with minor to moderate deterioration is a mill and overlay procedure. In this process, a specified depth of the existing pavement is removed, or milled off. Upon removal of the existing pavement surface, all of the remaining c racks are sealed t o prevent moisture penetration into t he roadway subgrade. A new bituminous asphalt overlay is then placed to seal the roadway and match existing grades. This maintenance process is used to provide a new driving surface for the roadway while improving d river ' rideability' and rebuilding t he c enterline crown t o facilitate better drainage. A 1V2-inch depth mill and bituminous overlay is proposed for the following segments: Market Boulewtrd -- between Highway 5 and 78th Street Great Plains Boulevard - between Highway 5 and 78th Street West 78'h Street - between Market Boulevard and Great Plains Boulevard West 79th Street - between Market Boulevard and Great Plains Boulevard West 79th Street - from Great Plains Boulevard to the cul-de- sac terminus In locations where the pavement has deteriorated to a more significant extent, the existing pavement and roadbed will be ground into a recycled base material that will be used under the proposed pavement structure. A full-depth reclaim of the existing pavement is proposed for the following segments. South Shore Drive/South Shore Court - from the west intersection with Highway 101 to the east intersection with Highway 101. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 10 5.1.1 Market Boulevard 5.1.2 In general, t he pavement surface i n t his se gment shows evidence o f moderate deterioration. This is characterized by minor transverse and longitudinal cracking. Based upon our field observations and our study of the existing and proposed traffic volumes, we recommend a full-width, 1V2-inch mill and bituminous overlay as the appropriate rehabilitation strategy. In addition, any cracks remaining upon completion of the milling operation ~vill be sealed to minimize any moisture penetration to the subgrade material. The traffic signal loop detectors at the intersections of Market Boulevard with Highway 5 and 78th Street are typically removed and/or significantly damaged during the milling operation. The loop detectors will be replaced in conjunction with the paving of the bituminous wear course. The existing pavement markings and traffic control have been documented during our field investigation. These markings will be further analyzed during the design phase of the project to determine if any revisions to the existing pavement markings are necessary. The existing pavement markings will be replicated and replaced with new epoxy pavement markings upon completion of the final wear course. An analysis of the Twin City and Western Railroad crossing with Market Boulevard has determined that the existing lighting and crossing signals are adequate for the intersection. However, the rubber-matted material between the railroad tracks is nearing the end of its functional life and should be replaced in conjunction with this project. An estimated cost for the removal and replacement of the rubber mat and related materials at the crossing, has been included in the overall cost estimate as found in the Appendix. Great Plains Boulevard The pavement surface in this segment also shows evidence of moderate deterioration. The transverse and longitudinal cracking is similar to that found on Market Boulevard. Based upon our field observations and our study of the existing and proposed traffic volumes, we recommend a full-width, 1 h-inch mill and bituminous overlay as the appropriate rehabilitation strategy. The remaining cracks will be sealed to minimize any moisture penetration to the subgrade material. The traffic signal loop detectors at the intersections of Great Plains Boulevard with Highway 5 and '78th Street will be removed and/or significantly damaged during the milling operation. The loop detectors will be replaced in conjunction with the paving of the bituminous wear course. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 11 5.1.3 The existing pavement markings and traffic control have been documented during our field investigation. These markings will be further analyzed during the design phase of the project to determine if any revisions to the existing pavement markings are necessary. The existing pavement markings will be replicated and replaced with new epoxy pavement markings upon completion of the final wear course. An analysis of the Twin City and Western Railroad crossing with Great Plains Boulevard has determined that the existing lighting and crossing signals are adequate for the intersection. However, the rubber-matted material between the railroad tracks is nearing the end of its functional life and should be replaced in conjunction with this project. An estimated cost for the removal and replacement of the rubber mat and related materials at the crossing, has been included in the overall cost estimate as found in the Appendix. West 78th Street 5.1.4 The bituminous surface in this location shows signs of deterioration, but the pavement appears to be structurally sound. We recommend a full-width, 1 V2-inch mill and bituminous overlay, with related crack repair, as an appropriate rehabilitation strategy in this location, in conjunction with slope and curb adjustments to improve storm drainage. This will be discussed in greater detail in Section 5.4 Drainage, of this report. Traffic signal loop detectors at the intersections of 78th Street with Market Boulevard, Laredo Drive, Great Plains Boulevard and Highway 101 will be removed and/or significantly damaged during the milling operation. The loop detectors will be replaced in conjunction with the paving of the bituminous wear course. On the segment of 78th Street, approximately 700 feet east of the intersection with Great Plains Boulevard, there are several unused driveway aprons on the south side of the roadway that were originally used to access the cemetery adjacent to 78th Street. These aprons will be removed in conjunction with this project, and replaced with B618 curb and gutter. The existing pavement markings and traffic control have been documented during our field investigation. These markings will be further analyzed during the design phase of the project to determine if any revisions to the existing pavement markings are necessary. The existing pavement markings will be replicated and replaced with new epoxy pavement markings upon completion of the final wear course. West 79th Street There are two segments of 79th Street studied within the context of this report. The first is bound by Market Boulevard on the west and Great Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 12 Plains Boulevard on the east. The other segment begins at Great Plains Boulevard and extends east and terminates in a cul-de-sac approximately 700 feet to the east. On the segment between Market Boulevard and Great Plains Boulevard, the most significant problem with the pavement exists approximately 450 feet east of Market Boulevard. A poorly bedded storm sewer pipe has heaved into the roadbed and created a 'hump' in the pavement surface. The pavement in this section will need to be removed and the storm sewer pipe and structures will need to be salvaged and replaced on appropriate bedding material to minimize any potential damage from frost heave. This entire procedure will necessitate the complete reconstruction of about 200 feet of roadway on 78th Street. The remainder of this segment has shown moderate signs of fatigue in the form of transverse and longitudinal cracking of the driving surface. We recommend a full-width, 1 V2-inch mill and bituminous overlay, with related crack repair, that matches into the reconstruction segment. The segment east of Great Plains Boulevard is in relatively good condition. According to the as-built plans on file with the City, this segment was widened and resurfaced in 1991. The low traffic volumes and recent improvements have contributed to the limited deterioration on this segment and have minimized the need for rehabilitation at this time. However, due to the adjacent construction proposed in this study and the timeline for future maintenance activities in this location, the City may elect to rehabilitate this segment of 79th Street at this time. If so, a 1V2-inch mill and overlay would preserve the existing pavement structure for up to ten years. Originally, there was some discussion about extending 5.1.5 South Shore Drive/South Shore Court The existing pavement in the South Shore Drive/Court area has shown signs of moderate to significant deterioration. Relatively flat grades and extensive cracking in some areas have allowed drainage from storm runoff and snow melt to penetrate the pavement and underlying subgrade. This penetration has attributed to the poor condition of the pavement structure. Since the existing D-type surmountable curb utilized in the South Shore area is in relatively good condition and does not require complete reconstruction, we recommend a full-depth reclamation of the existing pavement structure and underlying base material, between the existing curb and gutter. This reclaimed material is intended to be used as a base beneath the new bituminous pavement. FeasibiLity Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 13 5.2 However, to our knowledge, there have been no soil borings performed in the South Shore area at this time. If any existing/future soil borings indicate the presence of clay soils under the aggregate base material, it may contaminate the reclaimed aggregate base produced in this area. To minimize the potential for contamination, the streets could be reconstructed with conventional methods, which will require the contractor to excavate and haul off-site enough material to construct the local street section with imported aggregate base rather than reclaimed aggregate base. Quantities for this contingency have been included in the cost estimate, found in the Appendix of this document. Sidewalk Upon inspection of the existing sidewalks adjacent to the roadways in the study area, they have been found to be in relatively good condition. Therefore, a majority of the proposed improvements related to the sidewalks consist of the construction of new sidewalks and/or modifying access to an existing sidewalk. Sidewalks are not required by MSA standards, but are eligible for MSA funding if included. Thus, a 5-foot concrete sidewalk will be constructed on the east-side of Market Boulevard from Highway 5 to 79th Street. A sidewalk will also be constructed from the existing pedestrian ramp in the northwest quadrant of the intersection of Great Plains Boulevard and 79th Street, extending north to connect with the existing sidewalk. The proposed sidewalk sections will consist of 4 inches of aggregate base material and 4 inches of concrete pavement. On the north side of 79th Street, approximately 800 feet east of Market Boulevard, there is a relatively new sidewalk on the north side of the street. This sidewalk has been constructed to the back of the existing barrier curb, not allowing for handicapped access. The existing barrier curb will be removed, and a ADA-compliant pedestrian ramp will be constructed on the east and west end of the sidewalk. 5.3 5.4 Rights-of-Ways and Easements All proposed improvements identified in this feasibility study should be within the existing right-of-way (ROW) limits. No temporary or permanent easements are anticipated at this time. Drainage The reuse of the existing storm water collection system is a principle component of the proposed improvements identified in this study. However, some of the existing catch basins have heaved into the surrounding concrete curb and gutter, creating drainage problems and Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 14 5.4.1 5.4.2 5.4.3 allowing storm water to penetrate the subgrade soils, creating additional problems. Proposed correction of this problem will include adjusting the catch basin casting heights and/or curb and gutter replacement, where necessary. Other drainage improvements will be focused on alleviating areas with poor drainage, where existing ponding of runoff is evident. These improvements will include re-grading the roadway where necessary and the installation of concrete valley gutter at selected intersections to convey runoff to the existing catch basins. Market Boulevard Preliminary analysis has identified the intersection of Market Boulevard with Pauly Drive as a location that is relatively flat. Our field investigation and subsequent topographic survey has indicated that this location would benefit by the construction of an additional catch basin structure on the east and west side of the intersection to provide adequate drainage. These catch basins would be tied into the existing system, which ultimately drains into the storm water pond in the northwest quadrant of Market Boulevard and Highway 5. In addition, the existing valley gutter on both sides of the intersection should b e removed, t he s ubgrade adjusted t o d rain t o t he new catch basin structures, and replaced in order to facilitate the flow of the storm water. Great Plains Boulevard There were no significant drainage problems identified on Great Plains Boulevard. West 78th Street The two commercial driveways on the north side of 78th Street between Laredo Drive and the west intersection of 78th Street with Great Plains Boulevard would benefit by the addition of a valley gutter across the driveway. At present, there is evidence of ponding in the gutter line on both of these driveways. In addition, there are several low spots in the outer and median gutter OB 78th Street between Market Boulevard and Great Plains Boulevard. Most of these low spots appear to be caused by curb that has heaved and/or settled. These curbs can be repaired either by ' mud-jacking' the existing curb, or removing and re-pouring the unsuitable curb sections. Moving east from the intersection with Great Plains Boulevard, there are three driveway entrances to the cemetery on the south side of 78th Street that are presently unused. These driveway aprons will be removed and replaced with standard B618 curb and gutter. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 15 The most troubling drainage issue on 78th Street occurs immediately west of the intersection with Highway 101. Existing drainage in the north curb-line of 78th Street is conveyed to the existing catch basin approximately 150 west of the intersection. However, any storm water to the east of this catch basin drains to the northwest comer of the intersection. As it pools in this gutter, it eventually overflows across 78th Street to the south and pools in the north gutter of the intersection 'pork-chop' island. Drainage pools in this location until continuing on to the south, across the 'free-right' turn lane, and into an existing catch basin. Additional discussion with the City is necessary to determine the extent of the existing problem in this area. A field investigation has determined that ponding does occur in each of the areas identified above, however, the typical depth and duration are not known at this time. Additional as-built plans have presently been requested from Mn/DOT for this location in order to ascertain invert elevations on the existing catch basins. One proposed solution would add a catch basin structure in the northwest comer of the intersection and connect it to the catch basin 150 feet to the west. However, the as-built information will be necessary to determine if this is feasible. 5.4.4 Upon further discussion with City staff, SEH will evaluate if any improvements are necessary in this location and additional alternatives will be evaluated during the design phase of this project. West 79th Street The only significant drainage problem identified on 79th Street occurs at the low point approximately 400 feet east of the intersection with Market Boulevard. The existing storm sewer pipe crossing 79th Street and extending to the storm water pond to the south, has heaved into the existing pavement creating an 'unintentional' speed bump in the road. This pipe, subgrade, and related catch basins will need to be excavated and replaced with granular bedding material, compacted, and replaced. If possible, the profile will be adjusted to lower the low point in this location, which will necessitate the reconstruction of approximately 200 feet of roadway to accommodate the profile revision. 5.4.5 South Shore Drive/South Shore Court Original investigation of the westernmost intersection of South Shore Drive with Highway 101 indicated that the existing surmountable D- type curb was relatively flat and drained poorly. However, subsequent investigation by our survey crew has indicated that the grade on the curb in this location is adequate and drains appropriately. The standing water in the South Shore Drive/South Shore Court intersection will be easily remedied by the reconstruction of the Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 16 roadway and existing valley gutter. The intended crown of the roadway has settled over the last 15 years, leading to a large flat area in the intersection. The proposed pavement surface will utilize a 2% cross slope to the gutter and the reconstructed valley gutter will improve drainage across the intersection. The other major drainage issue in this area is in the Lotus Lake Park parking lot. Although the parking lot is not presently within the scope of work for this project, a large amount of runoff from the project area ends up in the parking lot, as it is the low point for a majority of the development. At present, the parking lot does not have curb and gutter. Runoff from the South Shore development approaches the park in the gutter on South Shore Drive and drains across the Lotus Lake Park driveway to a low point in the northeast comer of the parking lot. Significant erosion has occurred as the runoff drains over the edge of the parking lot pavement surface and onto the grass. Additional discussions with City staff are necessary to determine whether Lotus Lake drainage improvements will be constructed in conjunction with this project. 5.5 Drain Tile A proposed drain tile system would intercept groundwater entering under the pavement and provide a dependable outlet to which property owners could connect their sump pump discharge piping or footing drains. The drain tile system would consist of a 4-inch perforated polyethylene pipe with drainage sock that would be installed behind the existing D-type curb approximately three feet deep. Lateral services would be extended to adjoining properties as necessary with a sump box at the end. This type of system is proposed to flank both sides of the street in the South Shore Drive/Court area. At present, this is the only location in the project area where groundwater problems have been identified. Additional drain tile may be proposed at other locations in the project area if warranted and deemed feasible by City staff. 5.6 Utilities Due to the present condition of the sanitary sewer and water main in the project area, no improvements to the public utilities are proposed at this time. Private utilities such as electric, telephone, gas, and cable TV, will be notified of the impending potential improvement project and any proposed improvements to those facilities will be coordinated with the appropriate agency and constructed prior to the placement of the bituminous wear course and/or restoration of the sod. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 17 5.7 Concrete Curb and Gutter A detailed field review of the existing concrete curb and gutter conditions was performed to identify replacement areas with the objective of preserving as much existing concrete curb and gutter as possible. The criteria used to determine unacceptable curb was based on the following: 1. The curb needed to be removed if one major defect was found on a section, e.g., a faulted crack. 2. The curb needed to be removed if three minor defects were found on a section, e.g., several tight cracks and a scalloped curb face. Approximately five percent of the existing B-type curb was found to be in need of repair or replacement. The deteriorated curb was largely in the vicinity of the existing catch basins where the curb and gutter section has heaved/settled. A larger percentage of the D-type surmountable curb was found to be in poor condition. From our estimates, as much as 15% of the D-type curb in the South Shore Drive/Court area and on 79th Street between Market Boulevard and Great Plains Boulevard should be removed and replaced. The replacement curb a nd g utter w ill significantly improve drainage flow, maintain structural support to reduce edge deterioration, and continue to protect boulevards from traffic and snow plowing. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 18 6.0 Implementation Estimated Project Costs The estimated project costs are separated into categories for ease o f calculating proposed assessments. The project costs also include a 10% contingency. The total estimated project cost of the proposed improvements is $1,274,685178 as shown in the following table. Estimated Item MSA Roadway Portion 1. 2. 3. Proiect Costs Market Boulevard (Highway 5 to 78th Street) $174,884.33 Great Plains Boulevard (Highway 5 to 78th Street) $160,498.80 78th Street (Market Blvd. to Great Plains Blvd) $244,003.38 MSA Roadway Subtotal $506,786.50 MSA/State Turnback Portion 1. 78th Street (Great Plains Blvd. to Highway 101) MSA/State Turnback Subtotal Non-MSA Roadway Portion 1. 79th Street (east of Great Plains Boulevard) 2. 79th Street (Market Blvd to Great Plains Blvd.) Non-MSA Roadway Subtotal Local Street Portion $105,645.65 $105,645.65 $30,240.38 $133,822.43 $164,062.81 1. South Shore Drive $177,884.03 2. South Shore Court $54,822.08 3. West cul-de-sac $16,943.30 4. Lake Access cul-de-sac $26,271.03 Local Street Subtotal $275,920.43 A detailed estimated project cost is included in the Appendix A. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 19 6.2 6.3 Proposed Financing The cost of the proposed improvements is intended to be financed by a combination of MSA funds, State Tumback funds, and special assessments. Original allocated funds for this project are: MSA Street funds: $1,000,000 State Turnback funds: $250,000 Based u pon t he initial cost estimate, these amounts m ay be reduced and the remaining balance will be made up with special assessments levied against the existing abutting property owners. Assessment Practice The following Assessment Practice is intended to provide direction to City Staff in preparation of assessment roles to ensure fair and consistent treatment of all properties within the City of Chanhassen. 6.3.1 6.3.2 Maintenance Maintenance items are identified by such activities as pothole filling, patching, crack sealing, seal coating, etc. Maintenance costs are not assessed to abutting property owners, rather these costs are financed through the City's Annual Budget process. Rehabilitation The Assessment Practice identifies rehabilitation as the repair of problem areas to full depth, milling of the roadway edge or full width of the existing pavement, repair to existing catch basins and/or curb and gutter, and pavement overlays. Rehabilitation costs are assessed using the following formula: Total Cost = 60% Paid by City + 40% Paid by Property Owners The 60% portion paid for by the City may apply MSA funds, General funds, TIF, and/or other Federal and State financing. Residential properties that abut collector or commercial streets shall be assessed using the same formula, however, the assessments shall be reduced to be equivalent to a typical 31' residential street section. 6.3.3 Reconstruction Reconstruction is classified as the removal or recycling of an existing street and construction of a new street. This may include sanitary sewer and/or water main work. Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 20 6.3.4 Reconstruction costs will be assessed using the same formula as the Rehabilitation costs identified above. New Construction New Construction is identified as construction of a new street and/or utilities, or a significant upgrade from the previous facilities (i.e. a 4- lane street replaces an existing 2-lane street). This type of New Construction will be assessed at 100% to the adjacent benefiting properties. If a feature (sanitary sewer, water main, curb and gutter, etc.) that did not previously exist is added during a Rehabilitation or Reconstruction project, the cost of that item is treated as New Construction with the remaining project costs being treated as Rehabilitation or Reconstruction. 6.3.5 6.4 6.5 Work Performed by City Crews Work completed by City Crews may be maintenance, rehabilitation, or new construction. This work is not typically assessed. Exceptions would include work associated with an assessment agreement signed by the property owner and approved by the City Council and work specifically authorized by the City Council to be done by City Crews and assessed to the abutting properties. Proposed Assessments Based upon the Assessment Practice, the proposed improvements identified in this report may be classified under the Rehabilitation category. According to the cost assessment formula, 40% of the total project cost will be paid by special assessments levied against the abutting property owners. For this project, the total amount to be assessed has been computed as $509,874.31 for the proposed rehabilitation improvements. DISCUSS ASSESSMENT METhODoLOGY FoR ~DI~ID~AL PROPERTIES The mock assessment roll is included in the Appendix. Future Maintenance Text Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 21 7.0 Schedule 7.1 Project Schedule The following schedule has been developed to allow the construction of the improvements described herein to be completed during the summer of 2004. There is some flexibility built into the schedule. The schedule should b e reviewed a nd updated a t e ach o f t he future City Council authorizations. Item Council Accepts Report, Orders Public Imp. Hearing Neighborhood Meeting Public Improvement Hearing - order project Prepare Plans & Specifications Bidding Assessment Hearing - award contract Construction 2003 2004 Aug Sept Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Se Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 22 8.0 Project Contacts 1. Teresa Burgess, P.E. City Engineer City of Chanhassen P.O. Box 147 7700 Market Boulevard Chanhassen, Minnesota 55317 (952) 227-1169 tburgess~ci.chanhassen.mn.us Mike Foertsch, P.E. Project Manager Short Elliott Hendrickson Inc. 10901 Red Circle Drive, Suite 200 Minnetonka, MN 55343 (952) 912-2620 mfoertsch~sehinc.com Jason P. Sprague, P.E. Project Manager Short Elliott Hendrickson Inc. 100 North 6th Street, Suite 710C Minneapolis, MN 55403 (612) 758-6805 j sprague~sehinc.com Feasibility Report for Project No. 04-02 SEH No. A-CHANH0308.00 Chanhassen, Minnesota Page 23 List of Figures Figure 1 - Street Summary Figure 2 - Storm Sewer Summary Figure 3 - Drain Tile Summary Figure 4 - Curb Summary Figure 5 - MSA Street Reconstruction - Typical Section Figure (~ - Local Street Reconstruction - Typical Section Appendix A Estimated Project Costs Appendix B Mock Assessment Roll