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HomeMy WebLinkAboutFeasibility Study liSt CONSULTING ENGINEERS 1326 Energy Park Drive St. Paul, MN 55108 612-644-4389 1-800-888- 2923 Fax: 612-644-9446 CIVIL ENGINEERIN~ ENVIRONMENTAL MUNICIPAL PlANNING SOLID WASTE STRUCTURAL SURVEYING TRAFFIC TRANSPORTATION ElECTRICAL/ MECHANICAL ENGINEERING: HVAC POWER DISTRIBUTION SCADA SYSTEM CONTROLS OFFICES IN: MINNEAPOLIS PRIOR LAKE ST. PAUL W ASECA September 12, 1995 File: 102-057-10 Mr. Larry Anderson Prior Lake City Engineer 16200 Eagle Creek Avenue S.E. PriorLake,~ 55372 RE: ~bASIBILITY REPORT MUSHTOWN ROAD Dear Mr. Anderson: Please find enclosed 5 copies of the Feasibility report for Mushtown Road. We have revised the report as discussed yesterday with John Wingard. The following items are issues discussed at our meeting with you on September 6th together with issues addressed at your meeting with the developer on September 8th: . Adjusted project length and appropriate items to 2,300 feet. Adjusted developer cost for 7-ton obligated versus 9-ton design road section. Reduced bituminous driveway construction to about 50 % of previous quantity. Deleted geotextile for subgrade use. Deleted retaining wall near wetland. Reduced silt fence to about 50 % of previous quantity. Reduced common excavation price downward due to adjacent property to place excess material. . . . . . . We have also provided copies of revised Engineer Cost Estimate sheets for your review, should there be any questions as to how the project costs have been developed. If you have any further questions, please give us a call. Sincerely, MSA, CONSULiiNG ENGINEERS ~:~ Paul Boettcher, P.E. PB:pd Enclosures 057-1114.sep f4bASffiILITY STUDY FOR S 1 MET Th'U"KOVEMENTS ON MUSHTOWN ROAD CITY OF PRIOR LAKE I hereby certify that this plan, specification, or report was prepared by me or under my direct supervision and that I am a duly registered Professional Engineer under the laws of the State of Minnesota. ~~ ~l~ Paul E. Boettcher, P .E. Reg. No. 13929 Prepared by: (~ ~~' Cindy ~anski, P .E. Reg. No. 24082 q- Z4S Date MSA, Consulting Engineers 1326 Energy Park Drive St. Paul, MN 55108 Phone: (612) 644-4389 Fax: (612) 644-9446 FEAS-I02.057 I!'. .1 KODUCTION The purpose of this report is to detennine the feasibility of upgrading the existing gravel surface portion of Mushtown Road to a bituminous surfaced roadway. This project is necessary to provide an extension of the existing paved surface to the Woodridge Estates development. A meeting with the Developer and City staff was held, and it was determined that the Developer will contribute a minimum of $50,000 or 50%, whichever is higher, of the project cost for the portion adjacent to the plat of Woodridge 3rd Addition. Soil borings were taken by Allied Test Drilling Company for the Developer. The soils report indicated that lean clay and sandy lean clay materials are present below the existing Class 5 aggregate base. An estimated R-value of 12 was determined and a 9-ton pavement design recommended providing a minimum of 16 for the Granular Equivalent (GE), which consisted of 7.5 inches of Class 5 aggregate base and 4 inches of bituminous. Although a soils investigation was performed, the moisture contents were not determined. Without the moisture content of the soil, it is not possible to ensure that the existing soil will be stable for the placement of the ~(;gate base; therefore, we A~~mmend that additional soils work be preformed during the final design. The developers engineer for the Woodridge Estates development, Hansen Thorp Pellinen Olson, Inc., y~vvided a }I~~liminary survey of the road alignment with cross sections at 200 foot intervals. This was used to determine proposed rural and urban road designs. EXIS.lli~G CONDl.l10NS Mushtown Road has a 24-foot wide bituminous surface from Panama Avenue (CSAH 23) south 1,250 feet to al!l!~vximately the south plat line of Maple Acres, and a 3Q-foot wide gravel surface from the bituminous terminus, approximately 2,300 feet south to the City limit line. The gravel road continues south to serve the Township. The locations of the proposed improvements are shown by Exhibit 1. Currently, Mushtown Road has shallow ditches and isolated wetlands adjacent to the road. During the spring, the road becomes soft and unstable due to frost action. There are at least three wetlands adjacent to the road that are shown on the National Wetlands Inventory map, and one man-made pond. Stormwater runoff is currently conveyed by ditches overland to the wetlands adjacent to the road. PROPOSED IMPRO\' ~S It is proposed that Mushtown Road be upgraded to a bituminous surface with a width approximately the same as what exists, and designed for 30 mph. A traffic count was done by the City in August 1995, and an ADT (average daily traffic) of 554 resulted. Mushtown Road is not expected to have a significant increase in traffic volume, since the City limit/Township line is at the end of the proposed improvements. Future development of the area outside the City limits is not planned at this time, except that there is a potential to annex the nine acres directly across the road from Woodridge Estates 3rd Addition to the southwest. In anticipation of future development, sanitary sewer at Toronto Avenue and wa~uuain at Toronto Avenue and Ridgewood FEAS-I02.0S7 -1- Court will be stubbed out under Mushtown Road by the Developer from Woodridge Estates 3rd Addition. Two options were explv~~ for the street section-a rural section with ditches, and an urban section with concrete curb and gutter. The urban section would require less disruption to adjacent Pro~4 Lf since ditches would not have to be constructed. The urban design would provide the best uy}lOrtunity to preserve any desired trees along the development side of the road and would create a street consistant with City development. Both options would be designed to a 9-ton pavement strength based on the existing traffic volume and MnDOT design standards. The street section will include a 12" granular borrow layer, 6" of ~c.gate base, 2.5" of bituminous base, and 1.5" of bituminous wear. The granular borrow will improve the sub grade drainage conditions, and could be eliminated during design if the additional soils investigation shows that the granular bouvN is not required. The existing Class 5 aggregate base may be salvageable for re-use on the project if not too contaminated from spring frost heaving. The street width will remain the same in order to minimize wetland disruption. The typical street sections for both options are shown by Exhibit 2. The developer indicated he has access to P4Vperty adjacent to the project site which can be utilized as a disposal area for any excess excavated material. This will help to keep the cost down for the earthwork construction item. The developer will provide a letter from the adjacent property owner confirming this agreement. Storm drainage improvements for a rural section will include culverts under existing driveways and under the proposed streets to Woodridge Estates 3rd Addition. If the urban section is constructed, storm sewer will be installed to convey runoff to the existing wetlands and the man- made pond. The storm sewer could alternately bypass Wetland No.3 and be routed to the City Park pond via storm sewer pipes within Woodridge &tates 3rd Addition. An outlet from Wetland No. 3 to the storm sewer within the development is not feasible. The proposed storm sewer improvements for either option will include an outlet to the existing pond for high water that will be trapped within Wetland No.2 on the east side of the road. The proposed storm sewer improvements are shown by Exhibits 3 and 4. A permit from the Prior Lake/Spring Lake Watershed District will be required for the storm sewer improvements. If any filling of the wetlands are done, permits from the Minnesota Department of Natural Resources and the U.S. Corps of Engineers will be required. EASEMENTS A review of Scott County records shows no defined right-of-way for Mushtown Road except within platted areas adjacent to the road. The platted section adjacent to Woodridge Estates has a 50-foot right-of-way, but the remaining area must be acquired. The City can claim prescriptive rights since the road has been maintained by them; however, additional right-of-way will still be required outside of the traveled surface. It is recommended that the City acquire a 66-foot wide right-of-way over the entire length of the project. If an urban section was constructed, the right-of-way requirements may be able to be reduced, since the ditches would not be required. FEAS-I02.057 -2- COST OF IMPRO~ ~vuNrS The estimated costs for both Option 1, the urban section and Option 2, the rural section are provided in Table 1 and Table 2 below. These costs include 6~Clding of the existing roadway surface, placement of ag6~...gate base, bituminous surfacing, and storm sewer installation for Option 1; and grading of the existing roadway surface, placement of ag6l.(.,gate base, bituminous surfacing, ditch construction, and culvert placement for Option 2. These estimates include $20,000 for purchase of easements outside the prescriptive rights if they need to be purchased. If land owners will give the needed right-of-way, the project costs could be reduced. The estimated costs include 30 % for overhead and a 5 % contingency. FEAS-I02.057 -3- Table 1. OmON 1- URBAN FS .lJldA l.uJ PROJEL.l COST MUSHTOWN ROAD Project Cost $233,300 -D9.9OO $303,290 Estimated Construction Cost With Right-of-Way Overhead Table 2. OPTION 2 - RURAL FS.llidAIW PROJECT COST MUSBTOWN ROAD Estimated Construction Cost With Right-of-Way Overhead $178,200 53,460 Project Cost $231,660 .rll~ANCING It is proposed to finance the proposed improvements with both City funds and assessments to the adjacent i"J.v~rties. The J:lJ.uject will not be assessed to properties within Spring Lake Township. The proposed improvements have been discussed with the Developer of Woodridge Estates 3rd Addition. It is proposed to assess the plat for 50 % of the improvement costs which correspond to the frontage adjacent to Mushtown Road. The Developer's assessment will be $85,177 for the urban section and $63,786 for the rural section. PROJEL 1 SLJ:1JillULE The following project schedule outlines an approach to complete the project in 1996. Accept Feasibility Report October 2, 1995 Order Plans and Specifications October 2, 1995 Hold Public Informational Meeting December 1995 Approve Plans and Specifications December 1995 Begin Right-of-Way Acquisition January 1996 Advertise for Bids April 1996 FEAS-I02.0S7 -4- Hold Assessment Hearing May 1996 A ward Contract May 1996 Begin Construction June 1996 Complete Project July 1996 CONCLUSION The total estimated cost of the proposed improvements is $303,290 for Option 1, the urban section, and $231,660 for Option 2, the rural section. The project cost is proposed to be assessed to the benefitting property owners and paid for with City funds. The project is feasible from an engineering standpoint, and will benefit the properties proposed to be assessed. PEAS-I02.0S7 -5- \ \ ~ o 400 . I PROJECT Sfl t: PL057EX \fSA MUSHTOWN ROAD S I HEt: I IMPROVEMENTS LOCATION MAP ~l;{lXlU~U1r ~ SJLTIK EICIIIDS - ROW 50' ADJACENT TO PLAT 33' TO BE ACQUIRED ROW 28' FACE TO FACE 2' El618 CONCRETE CURB & GU IIc.R ~ ~ c.~.-...,m~ 2.00%_ ~.....fl j r'i:" _ ~.~.~-.- . . 1 /4. /fl.~,o/". ~ [~ , ROUND TRANSITION - ~EN CHANGING --- GRADE - 1 1/2" TYPE 41A BITUMINOUS WEAR COURSE 4" DRAINTILE TACK COAT 'M-fERE 2.5" TYPE 31 B BITIJMINOUS BASE COURSE NECESSARY 6" CLASS 5 AGGREGATE BASE 12. SUBCUT / SELECT GRANULAR BORROW ~. Q"fl' ~ (TYP) OPll0N 1 - URBAN MUSH TOWN ROAD ROW 50' ADJACENT TO PLAT 33' TO BE ACQUIRED ROW - -- J' SHOULDE~ .: 24' J' - SHOULDER ,,'-!: . '< t ~hr t ------- ,. ......'--- , . -~......~ . t , - 2.00%___ ":":"--~':"::",""" ''''''''~t..:.:........_-.. t ~~ t y , - 1 1/2" TYPE 41 A BITUMINOUS WEAR COURSE TACK COAT 2.5" TYPE 31 B BITUMINOUS BASE COURSE 6" CLASS 5 AGGREGATE BASE 12" SUBCUT /SELECT GRANULAR BORROW OPTION 2 - RURAL MUSH TOWN ROAD PL057EX MSIA MUSHTOWN ROAD PROPOSED S I HEt: I SECTIONS ~~[}=flU~Uij ~ COKSUL11I !ICIIDRS \ .CITY ~~RK ) CITY ~ONV' UMII :) Ls 15- R STO SEWER 15- RCP STORM SEWER MANMADE POND- lS- RCP STORM S&:Wt.t< I ~'?) <P 15- RCP STORM SEYft..1'< I ~ o 300 I PL057EX YSJ_ MUSHTOWN ROAD S I HEt: I IMPROVEMENTS STORM St:Wt:H OPTION 1 - URBAN ~~IHlU~U1f ~ ;oNSULTIIG DGImIS \ CITY P~RK ) CITY "---.PON~ LI M II ~ 15- CMP STORM SEWER- 4,~ ~ 1J ~ ~O ~a 15- CMP STORM SEWER ......- ~ o 300 . , PROPOSED WOODRIDGE ESTAIt.S 3RD ADDITION " ~ PL057EX MS}~ MUSHTOWN ROAD S I HEET 1M =>ROVEME ffS STOR \A SEWER Ot' liON TWO - RURAL ~~ XlU~UlJ ~ COKSULTIIC !KClKEIIS JUL- 7-95 FRI ~2:05 MSA ST PAUL I !'ISl L... fO.\SlI.Tm; t"alU}:RS 1326 Er,cI9r Pork Dri'l! St. Po"l, MJ~ 55108 612-64.i-.s389 1-800'8382923 FOe(: 612'6d4.901A6 OVll [NC;r-:fl~Ii'iv. ~o..; 'iRONMENT Al ;~IJ~IlCPAl tltA '~:'-jING SCUD WASTE ~a.lJC1'..iRAt S\;R....E'rI~JG Tl:.F ;1(. 1iV-NSrvA! A .ION ELECi~lCAl/ '''EC!1ANICAl !NGI~leEp.:1'1G HVAC ~WER OIS:R!8lJlION SC,),OA ST~1E~~ CO..TRClS OFFICES iN: MINNEMOllS RIOR LAKE ST. PAUL 'II ASECA P.02 July 7, 1995 File: 900-000-00 ~ 0D ~ ~fr. John Wingard Assistant City Engineer City HaIl 16200 Eagle Creek Avenue Southeast Prior Lake, MN 55372-1714 RE: ESl1MA'lbD LEVEL OF ENGINEERING SERVICES; t'.cASIBILITY STUDY PHASE, MUSHTOWN ROAD PROJECT Dear Mr. Wingard: Thank you very much for offering us the opportunity to provide you with this estimate of engineering services as may be required to prepare the Mushtown Road feasibility study. MSA has conducted some preliminary research and a windshield survey. Our understanding of the project is summarized below: Mnc;;htown-.Road .At present, Mushtown Road is paved from the intersection with Scott County Road 23 south to the a~.lc;gate surfaced section which is to be improved. It is MSA I S understanding that the improvement is to extend approximately 2,500 linear feet to the south past the Wood ridge Estates, Third Addition. Further, it is our understanding that the existing paved section of Mushtown Road is to remain as-is. The 2,500 linear foot section of Mushtown Road that is to be improved is currently an aggregate-surfaced, rural section roadway approximately 24 feet wide. Follo\ving improvement, the improved section will be an urban section with curb and gutter, storm sewer and bituminous pavement. Although the curb opening width is yet to be detennined, ~fSA anticipates a curb opening width compatible with a collector street. Eeasihili.ty ~~ ~lSA will meet with City staff to discuss the Mushtown Road project and further retl~le the scope of the project as outlined above. MSA will obtain and review the preliminary surveying information. ~lSA will also review the soil borings that have been taken .tvlSA will conduct additional field surveys for preliminary design purposes as necessary. 900iOOO~70 I.jut JUL- 7-95 FRI 12:06 MSA ST PAUL P.03 Mr. John Wingard July 7, 1995 Page Two Following review of the soil borings and preliminary field surveys, MSA will complete preliminary design of the street improvements, as well as required storm sewc:.r. The preliminary designs will then be used to prepare cost estimates for the projxt. MSA understands that the City of Prior Lake wishes to have cost estimates that are accurate to :t: 10% of the actual final project costs. Following completion of the preliminary cost estimate, ~fSA will prepare a detailed draft final report. The draft fmal report will be submitted to City staff for review. Following a review meeting with City staff, comments received will be incorporated into the draft report) and a final feasibility report will be issued. The final feasihility report will be complete with cost estimates, exhibits, and sketches. ~{SA will present the feasibility study report to the City Council and at public hearing(s). Presentation graphics will be prepared for the presentations. A.ss~.....pnt 'Rnle~ It is MSA' s understanding that City staff will research property records and take the lead in preparing preliminary assessment roles. MSA will assist City staff in this effort by providing construction and engineering cost estimates. A.l!ail~'blp Inrn. ...atinn MSA anticipates that record drawings are available for the existing paved portion of Mushtown Road. The record drawings will be used to minimize the field surveying necessary for preliminary design. It is anticipated that little record drawing information will be avai1able for the aggregate- surfaced portion of Mushtown Road. SOil Rnrings ~ISA has obtained the logs of auger borings that have been taken. However, there is no geotechnical interpretation of the soil borings. Our proposal includes a $500 allowance for geotechnical interpretation of the auger borings. Geotechnical interpretation will be billed at ~1SA' s cost with no mark-up. 900;000-0701.jul JUL- 7-95 FRI 12:07 MSA ST PAUL P_04 Mr. John Wingard July 7, 1995 Page Three Right-n'.. Way F_'Icempotc MSA anticipates that only prescriptive rights exist for Mushtown Road and not dedicated right-or-way or roadway easement. Prescriptive rights are limited to only the existing traveled surface. Therefore, additional right-of-way will be rr.quired. In addition, easements for storm sewer may be required. We have included 8 hours of land surveyor time to research the existing right-of-way and to define additional rlght-of..way/easement needs. ~fa;ling"" MSA anticipates that the City of Prior Lake will undertake the development of the 429 notices, mailings, and public hearing notices. Cost Fq;m~te To develop a detailed feasibility report for the ~rushtown Road project and presentation to City staff and the City Council, MSA anticipates the level of effort as indicc.te.d on the attached exhibit. We would be pleased to review our work scope and cost estimates with you and discuss allY concerns you might have at your convenience. Sincerely I ~ISAJ CONSUL liNG ENGINEERS ~~~ Thomas A. Roushar, P.E. TAR:pd 900/000-070 l.j ul JUL- 7-95 FRI ~2:0a MSA ST PAUL F. _ &.35 EXHmrr CITY OF PRIOR LAKE .MUSHTOWN ROAD r .t..ASIBILITY STUDY COST ES 1 u\iIA l.t.. Stafr Errort Hours Project Manager 2 Design Engineer 8 Staff Engineer 32 Technician 16 Secretary 4 Land Surveyor 8 Survey Crew 8 Total Hours 74 Estimated Labor Cost $5,200.00 Geotechnical $500.00 Estimated Total Cost $5,700.00 9COiOOO~101.jul