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2. Grandview Road Improvements: Feasibility Report, Preparation of Plans & Specs.CITY OF CHANHASSEN 690 COULTER DRIVE • P.O. BOX 147 • CHANHASSEN, MINNESOTA 55317 (612) 937 -1900 • FAX (612) 937 -5739 MEMORANDUM TO: Don Ashworth, City Manager FROM: Charles Folch, Director of Public Works DATE: July 23, 1997 Action by C.yAity sttalor Admtnt� Endors " � Modifie Rejecte - q Date Submitted to Commisslort Date Submitted to Council SUBJ- Receive Feasibility Report for Grandview Road Utility Improvements; Authorize Preparation of Plans and Specifications - Project No. 97 -11 Attached is the feasibility study for the Grandview Road Utility Improvement Project No. 97 -11 as prepared by the project consultant engineer, William Engelhardt & Associates. The scope of the proposed improvements has been developed to meet the long -term utility needs of the five properties served by Grandview Road. A Notice of Public Hearing and a copy of this feasibility study have been sent to the five property owners along Grandview Road. If, following public testimony, there is a majority of support by the neighborhood to proceed with officially ordering this improvement project, a decision on weather or not the watermain system shall be looped for the neighborhood needs to be made. This report discusses the pros and cons associated with either looping or not looping the watermain system accordingly. Staff believes that looping the watermain system is the better option from an overall systems operations standpoint, however, staff would support either option chosen. At the close of the public hearing if there are no further relevant questions or concerns which cannot be answered and would require further study, it would be staffs' recommendation that the City Council approve the feasibility study for the Grandview Road utility improvements dated July 22, 1997 and authorize the preparation of plans and specifications, Project No. 97 -11. jms Attachment: Feasibility Study c: Dave Hempel, Assistant City Engineer Anita Benson, Project Engineer Jerry Boucher, Utility Superintendent Jeff Weyandt, Engelhardt & Associates \ Ws1\vo12 'engVub1ic \97- IN=ivefeas.doc FEASIBILITY STUDY for GRANDVIEW ROAD UTILITY EMpROVTMENTS CITY OF CHANHASSEN, MINNESOTA C.P. No. 97-11 S AO KCs s �n IJ � [1, z JUL �`�, "697 E GI ER19 DEPT. I hereby certify that this plan, specifications, 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 o�MinnAsota. William R. Engelhardt Date: July 22. 1997 Registration No. 12026 WILLIAM R. ENGELHARDT ASSOCIATES, INC. CosisuCtist� �nyineczs MD 52. 1107 HAZELTINE BOULEVARD CHASKA. MINNESOTA 55318 -1008 (612) 448 -8838 July 22 1997 City of Chanhassen c/o Mr. Charles Folch 690 Coulter Drive Chanhassen, MN. 55317 RE: Grandview Road Utility Improvements Honorable Mayor and City Council Members: Pursuant to your request we have prepared a feasibility study for sanitary sewer and watermain improvements for Grandview Road. We have included two options for watermain construction, maps, estimated cost and proposed method of financing for the improvements. We will be available at your convenience to address questions or concerns you may have regarding the study. Very truly yours, WILLIAM R. ENGELHARDT ASSOCIATES, INC. 0 , I '. /- William R. Engelhardt SUMMARY AND CONCLUSIONS SUM gARY AND CONCLUSIONS: 1) This project is feasible from an engineering point of view. 2) The improvements to be constructed as part of this project include sanitary sewer construction, watermain construction and restoration. 3) The total project cost is summarized as follows: OPTION NO. 1: Type of Work Sanitary Sewer Watermain Restoration Total Estimated Project Cost OPTION NO. 2: Type of Work Sanitary Sewer Watermain Restoration Total Estimated Project Cost 4) All project costs are considered assessable costs. Estimated Project Cost $ 15,541.55 $ 19,608.57 $ 9.977.75 $ 45,127.87 Estimated Project Cost $ 15,541.55 $ 33,444.21 $ 20.914.95 $ 69,900.71 5) The proposed method of assessment is on a residential equivalent unit (REU) basis. SC - 1 6) We recommend the cost associated with the project to be apportioned as follows: OPTION NO. 1: OPT ION NO. 2: Lateral Utility Pid No. Pro rt Assessment 25.0134100 Sinnen $15,144.98 25.0134200 Anderson $11,205.19 25.0134300 Bernier $15,144.98 25.0134000 Kokesh $ 3,632.72 25.0134400 Larsen $ 0 Total $45,127.87 OPT ION NO. 2: 7) Option No. 2 has a higher capital cost than Option No. 1 due to additional watermain installed to loop the system. Option No. 2 is better overall from a system standpoint in that two sources of water flow into the neighborhood should part of the line be temporarily shut down due to repairs and /or maintenance. Water quality issues such as rusty or odorous water are easier to mitigate with a looped watermain system. Option No. 1 will serve the neighborhood adequately but there may be some drawbacks as noted above from time to time. SC -2 Lateral Utility Pid No. PMe Assessment 25.0134100 Sinnen $21,013.04 25.0134200 Anderson $16,295.89 25.0134300 Bernier $21,013.04 25.0134000 Kokesh $ 5,789.37 25.0134400 Larsen $ 5.789.37 Total $69,900.71 7) Option No. 2 has a higher capital cost than Option No. 1 due to additional watermain installed to loop the system. Option No. 2 is better overall from a system standpoint in that two sources of water flow into the neighborhood should part of the line be temporarily shut down due to repairs and /or maintenance. Water quality issues such as rusty or odorous water are easier to mitigate with a looped watermain system. Option No. 1 will serve the neighborhood adequately but there may be some drawbacks as noted above from time to time. SC -2 8) Itemized cost estimates for the proposed improvements are included in Appendix A of this report. 9) A cost apportionment summary is included in Appendix B of this report. SC -3 REPORT GENERAL: The impetus for this study is a petition from residents owning property adjacent to Grandview Road to serve their lots with sanitary sewer and water. The construction is proposed to be financed through the Chapter 429 public improvements process. The Grandview Road Utility Improvements project includes extending sanitary sewer and watermain to serve the lots adjacent to Grandview Road. As part of this report we are presenting proposed improvements including estimated costs and a proposed method of financing the improvements. The location of Grandview Road and the adjacent properties is shown on Drawing No. 1. Grandview Road currently has an existing 33 foot right -of -way with a 15 foot () gravel surface. FIVE SCALE: 1 " =400' EAN�o MISOMIl MORE, P Gvs ��� �`,C KOM CITY OF CHANHASSEN MINNESOTA GRANDVIEW ROAD UTILITY IMPROVEMENTS FEASIBILITY STUDY PROJECT LOCATION PROJECT LOCATION WILLIAM R. ENGELHARDT ASSOCIATES CONSULTING ENGINEERS CHASKA, MINNESOTA 55318 JULY 1 1"=400' SANITARY SEWER: The proposed lateral sanitary sewer construction is shown on Drawing No. 2. The proposed lateral sanitary sewer construction for this project includes the extension of an existing 8 -inch diameter gravity line located on the eastern property line of the Villages On The Pond development at the northern end of the Anderson property. The line will be extended west along the northern end of the Anderson property and then north in the Grandview Road right -of -way. The size of the Anderson, Sinnen, Bernier and Kokesh properties allows for potential lot splits in the future. The existing home on the Anderson property has a sewer service stubbed from the Villages On The Pond development. The existing home on the Kokesh property is currently connected to sanitary sewer from the Hidden Valley development. It is anticipated the potential lot split of the Kokesh property will also be served from the existing sewer stubbed in the southeast corner of the property. The existing home on the Larsen property is currently served with sanitary sewer from the Hidden Valley development. If future subdivision occurs on the Larsen property, additional sewer service could be obtained from a line stubbed immediately to the northwest by the Villages On The Ponds development. The total estimated project cost for sanitary sewer improvements is $15,541.55. These costs are proposed to be assessed to the benefitting properties on a residential equivalent unit basis. An itemized cost estimate is provided in Appendix A. R -2 WATERMAIN: OPTION NO. 1: The proposed lateral watermain construction for Option No. 1 is shown on Drawing No. 2. The proposed lateral watermain construction for this project includes the extension of a 6-inch diameter watermain from an existing 8 -inch stub located on the eastern property line of the Villages On The Pond development at the northern end of the Anderson property. The watermain will be extended west along the northern end of the Anderson property and then north in the Grandview. Road right- of-way. The size of the Anderson, Sinnen, Bernier and Kokesh properties allows for potential lot splits in the future. It is anticipated the future split of the Kokesh property will access water service from the south. The existing home on the Kokesh property will be served with water by this project. The existing home on the Larsen property is currently being served with water from the Hidden Valley development. If future subdivision occurs on the Larsen property, additional water service could be obtained from a line stubbed immediately to the northwest by the Villages On The Ponds development. The total estimated project cost for the watermain improvements is $19,608.57. These costs are proposed to be assessed to the benefitting properties on a residential equivalent unit basis. An itemized cost estimate is provided in Appendix A. R -3 CITY OF CH AN H ASSEN MINNESOTA GRANDVIEW ROAD UTILITY IMPROVEMENTS FEASIBILITY STUDY OPTION NO. 1 i D Z 0 n w z 0 cn w O Q J J C) D z 0 m SINNEN ANDERSON EXISTING SANITARY SEWER EXISTING WATERMAIN PROPOSED SANITARY SEWER PROPOSED WATERMAIN WILLIAM R. ENGELHARDT ASSOCIATES CONSULTING ENGINEERS CHASKA, MINNESOTA 55318 1"=100' JULY. 1997 d BERNIER SCA KOKESH �Q N r� (,) 11• \f'l4AN \f:RAN11FQ7 LARSEN f'\r) A 1A /IAI/'\ nl/1 n r, OPTION NO. 2: The proposed lateral watermain construction for Option No. 2 is shown on Drawing No. 3. The proposed lateral watermain construction for Option No. 2 includes looping the proposed watermain described in Option No. 1 into an existing 8 -inch diameter watermain stub located in the northwestern end of the Grandview Road right -of -way. In addition to looping the watermain, a water service will be provided for the northern end of the Larsen property in the event of a future lot split. Option No. 2 increases the overall watermain cost, but provides a looped system which may reduce potential rusty or odorous water problems and also provides a secondary source for water should part of this line need, to temporarily shut down for repairs and /or maintenance. The total estimated project cost for the watermain improvements is $33,444.21. These costs are proposed to be assessed to the benefitting properties on a residential equivalent unit basis. An itemized cost estimate is provided in Appendix A. R -4 CITY OF CH AN H ASSEN MINNESOTA GRANDVIEW ROAD UTILITY IMPROVEMENTS FEASIBILITY STUDY OPTION NO. 2 EXISTING SANITARY SEWER D EXISTING WATERMAIN o L A R S E N PROPOSED SANITARY SEWER PROPOSED WATERMAIN s' f WILLIAM R. ENGELHARDT ASSOCIATES m CONSULTING ENGINEERS " CHASKA, MINNESOTA 55318 i �.. SCALE: 1 JULY 1997 x t o :,t z ; °- SNNEN BERNIER aA RA& S � � , t Q i SCALE: 1"=1 00 LLJ i � L 1 � I \O f ANDERSON KOKESH I H : 151 n•\m4AN\(.pANnCC9 nO n %Anr.ir Kin Z RESTORATION: The proposed restoration for this project includes Class 5 aggregate over a width of 15 feet in the Grandview Road right -of -way and restoring the driveway and lawn areas disturbed by construction to a condition equal to or better than conditions before construction. The total estimated project cost for restoration for Option No. 1 is $9,977.75. The total estimated project cost for restoration for Option No. 2 is $20,914.95. These costs are to be assessed to the benefitting properties on a residential equivalent unit basis. An itemized cost estimate is provided in Appendix A. EASEMENTS: A permanent utility easement will need to be acquired along the northern end of the Anderson property. R -5 FINANCING: The project is proposed to be financed through the sale of 429 Improvement Bonds. The estimated project costs for lateral utility improvements is as follows: OPTION NO. 1: Sanitary Sewer $ 15,541.55 Watermain $ 19, 608.57 Restoration $ 9,977.75 Total Estimated Project Cost $ 45,127.87 OPTION NO. 2: Sanitary Sewer $ 15,541.55 Watermain $ 33,444.21 Restoration $ 20,914.95 Total Estimated Project Cost $ 69,900.21 The total estimated project costs for lateral utility improvements includes 30 percent for indirect project costs. All of the cost is considered assessable. These lateral improvements are to be assessed on a residential equivalent unit basis to the benefitting properties. In addition to the lateral assessment, each owner will pay a trunk sanitary sewer hook up charge and a trunk watermain hook up charge. These hook up charges can be assessed with the project or paid at the time that connection is made to the city sewer and water system. The current trunk hook up charges are $1,190.00 per sewer REU and $1,550.00 per water REU. These rates are adjusted annually by the city based on construction cost indices. If the trunk hook up charges are not assessed with the project, it is likely the rates will be higher in the future when property connections are made. R -6 We recommend the project costs be apportioned as follows: OPTION NO. 1: OPT ION NO. 2: Lateral Utility Pid No. Pro Assessment 25.0134100 Sinnen $15,144.98 25.0134200 Anderson $11,205.19 25.0134300 Bernier $15,144.98 25.0134000 Kokesh $ 3,632.72 25.0134400 Larsen S- 0 - 00 Total $45,127.87 OPT ION NO. 2: An itemized summary of the assessments is provided in Appendix B. R -7 Lateral Utility Pid No. Pro Assessment 25.0134100 Sinnen $21,013.04 25.0134200 Anderson $16,295.89 25.0134300 Bernier $21,013.04 25.0134000 Kokesh $ 5,789.37 25.0134400 Larsen $ 5.789.37 Total $69,900.71 An itemized summary of the assessments is provided in Appendix B. R -7 APPENDIX A ESTIMATED COSTS r• GRANDVIEW ROAD UTILITY IMPROVEMENTS OPTION NO. 1 - DEAD END WATERMAIN ESTIMATED COSTS SANITARY SEWER: 8" PVC, SDR 35 390 L.F. @ $ 18.00 /L.F. _ $ 7,020.00 48" Standard Manhole (0' -10' Depth) 2 Each @ $1,200.00 /Each = $ 2,400.00 8" x 4" Wye 5 Each @ $ 50.00 /Each = $ 250.00 4" PVC, SVC Pipe 80 L.F. @ $ 10.00 /L.F. _ $ 800.00 2 Each @ $ 550.00 /Each Subtotal = $ 10,470.00 Hydrant Add: 5% Mobilization = L_523.50 3,000.00 Total Estimated Sanitary Sewer 265 LBS. @ $ 1.50 /LB. _ $ Construction Cost = $ 10,993.50 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 4,548.05 Total Estimated Sanitary Sewer Project Cost = $ 15,541.55 WATE RMAIN: 6" DIP, CL. 52 385 L.F. @ $ 18.00 /L.F. _ $ 6,930.00 Connect to Existing Watermain 1 Each @ $ 250.00 /Each = $ 250.00 6" Gate Valve 2 Each @ $ 550.00 /Each = $ 1,100.00 Hydrant 2 Each @ $1,500.00 /Each = $ 3,000.00 Fittings 265 LBS. @ $ 1.50 /LB. _ $ 397.50 A- 1 1 1" Copper Service Pipe, Type K 134 L.F. @ $ 8.00 /L.F. _ $ 1,072.00 Service Group 7 Each @ $ 100.00 /Each = $ 700.00 Subtotal = $ 13,449.50 Add: 5% Mobilization = $ 672.48 Total Estimated Watermain Construction Cost = $ 14 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 5.486.59 Total Estimated Watermain Project Cost = $ 19,608.57 RESTORATION: Common Excavation (Approximately 195 C.Y.) Lump Sum = $ 1,170.00 Sod 542 S.Y. @ $ 2.50 /S.Y. _ $ 1,355.00 Temporary Trench Restoration 539 S.Y. @ $ 3.00 /S.Y. _ $ 1,617.00 STREET RES TORATION: Subgrade Preparation 366 S.Y. @ $ '0.30 /S.Y. _ $ 109.80 9" Class 5 Aggregate Base (100% Crushed Quarry Stone) 187 Tons @ $ 8.00 /Ton = $ 1,496.00 DRIVEWAY RESTORATION: Subgrade Preparation 173 S.Y. @ $ 0.30 /S.Y. _ $ 51.90 A -2 r 6" Class 5 Aggregate Base (100% Crushed Quarry Stone) 3" Bituminous Wearing Course (MnDOT 2331, Type 413) 59 Tons Q $ 8.00 /Ton = $ 472.00 173 S.Y. Qa $ 6.00 /S.Y. _ $ 1.038.00 Subtotal = $ 7,309.70 Add: 5% Mobilization = $ 365.49 Total Estimated Restoration Construction Cost = $ 7,675.19 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 2.302.56 Total Estimated Restoration Project Cost = $ 9,977.75 Total Estimated Project Cost _ $ 45,127.87 A -3 GRANDVIEW ROAD UTILITY IMPROVEMENTS OPTION NO. 2 - LOOPED WATERMAIN ESTIMATED COSTS SANITARY SEWER: 8" PVC, SDR 35 48" Standard Manhole (0' -10' Depth) 8" x 4" Wye 4" PVC, SVC Pipe WATERMAIN: 6" DIP, CL. 52 Connect to Existing Watermain 6" Gate Valve Hydrant Fittings 390 L.F. @ $ 18.00 /L.F. _ $ 7,020.00 2 Each @ $1,200.00 /Each = $ 2,400.00 5 Each @ $ 50.00 /Each = $ 250.00 80 L.F. @ $ 10.00 /L.F. _ $ 800.00 Subtotal = $ 10,470.00 Add: 5% Mobilization = $ 523.00 Total Estimated Sanitary Sewer Construction Cost = $ 10,993.50 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 4.548.05 Total Estimated Sanitary Sewer Project Cost = $ 15,541.55 862 L.F. @ $ 18.00 /L.F. _ $ 15,516.00 2 Each @ $ 250.00 /Each = $ 500.00 3 Each @ $ 550.00 /Each = $ 1,650.00 2 Each @ $1,500.00 /Each = $ 3,000.00 645 LBS. @ $ 1.50 /LB. _ $ 967.50 A -4 r 1" Copper Service Pipe, Type K Service Group RESTORATION: Common Excavation (Approximately 370 C.Y.) Sod Temporary Trench Restoration STREET RESTORATION: Subgrade Preparation 9" Class 5 Aggregate Base (100% Crushed Quarry Stone) DRIVEWAY RESTORATION: Subgrade Preparation 144 L.F. @ $ 8.00 /L.F. = $ 1,152.00 8 Each @ $ 100.00 /Each = $ 800.00 Subtotal = $ 23,585.50 Add: 5% Mobilization = I_1.172.28 Total Estimated Watermain Construction Cost = $ 24,764.78 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 8.679.43 Total Estimated Watermain Project Cost = $ 33,444.21 Lump Sum = $ 2,220.00 927 S.Y. @ $ 2.50 /S.Y. _ $ 2,317.50 1,356 S.Y. @ $ 3.00 /S.Y. = $ 4,068.00 1,183 S.Y. @ $ 0.30 /S.Y. = $ 354.90 600 Tons @ $ 8.00 /Ton 173 S.Y. @ $ 0.30 /S.Y. = $ 4, 800.00 = $ 51.90 6" Class 5 Aggregate Base (100% Crushed Quarry Stone) 3" Bituminous Wearing Course (MnDOT 2331, Type 41B) 59 Tons @ $ 8.00 /Ton = $ 472.00 173 S.Y. @ $ 6.00 /S.Y. _ $ 1.038.00 Subtotal = $ 15,322.30 Add: 5% Mobilization = $ 766.12 Total Estimated Restoration Construction Cost = $ 16,088.42 Add: 30% for Engineering, Legal, Administration and Miscellaneous = $ 4,826.53 Total Estimated Restoration Project Cost = $ 20,914.95 Total Estimated Project Cost _ $ 69,900.71 A -6 APPENDIX B COST APPORTIONMENT SUMMARY Appendix B Cost Apportionment Summary OPTION NO.1 PID # Property Residential Equivalent Units Sewer I Water Lateral Sanitary Sewer Lateral Watermain Restoration Total 25.0134100 SINNEN 2 2 $6,216.62 $5,602.44 $3,325.92 $15,144.98 25.D134200 ANDERSON 1 2 $3,108.31 $5,602.44 $2,494.44 $11,205.19 25.0134300 BERNIER 2 2 $6,216.62 $5,602.44 $3,325.92 $15,144.98 25.0134000 KOKESH 0 1 0 $2,801.25 $831.47 $3,632.72 25.0134400 LARSEN 0 0 0 0 0 0 TOTAL $45,127.87 OPTION NO. 2 PID # Property Residential Equivalent Units Sewer Water Lateral Sanitary Sewer Lateral Watermain Restoration Total 25.0134100 SINNEN 2 2 $6,216.62 $8,361.05 $6,435.37 $21,013.04 25.0134200 ANDERSON 1 2 $3,108.31 $8,361.05 $4,826.53 $16,295.89 25.0134300 BERNIER 2 2 $6,216.62 $8,361.05 $6,435.37 $21,013.04 25.0134000 KOKESH 0 1 0 $4,180.53 $1,608.84 $5,789.37 25.0134400 LARSEN 0 1 0 $4,180.53 $1,608.84 $5,789.37 TOTAL $69,900.71 B -1 NOTE: Each property is required to pay trunk hook up charges before connection to sanitary sewer and water can be made. The 1997 trunk hoop up rates are $1,190.00 /REU trunk sanitary sewer and $1,550.00 /REU trunk watermain. These rates are adjusted annually by the city based on construction cost indices.