Loading...
1b. 2013 Street Rehabilitation: Accept Feasibility Study and Call PHMEMORANDUM CITY OF r TO: Paul Oehme, Director of Public Works /City Engineer C luu�luwSE FROM: Alyson Fauske, Assistant City Engineer all 7700 Market Boulevard PO Box 147 DATE: December 10, 2012 Chanhassen, MN 55317 Administration Phone: 952.227.1100 Fax: 952.227.1110 Building Inspections Phone: 952.227.1180 Fax: 952.227.1190 Engineering Phone: 952.227.1160 Fax: 952.227.1170 Finance Phone: 952.227.1140 Fax: 952.227.1110 Park & Recreation Phone: 952.227.1120 Fax: 952.227.1110 Recreation Center 2310 Coulter Boulevard Phone: 952.227.1400 Fax: 952.227.1404 Planning & Natural Resources Phone: 952.227.1130 Fax: 952.227.1110 Public Works 7901 Park Place Phone: 952.227.1300 Fax: 952.227.1310 Senior Center Phone: 952.227.1125 Fax: 952.227.1110 Web Site www.ci.chanhassen.mn.us SUBJECT: 2013 Street Rehabilitation Project No. 13 -01: Accept Feasibility Study; Call Public Hearing PROPOSED MOTION "The City Council adopts the attached resolution accepting the feasibility report for the 2013 Street Rehabilitation Project No. 13 -01 and calls the public hearings for January 14, January 28, and February 11, 2013. City Council approval requires a simple majority vote of the City Council present." BACKGROUND At the September 10, 2012 work session, staff reviewed with Council the proposed 2013 Street Improvement project areas. Staff also discussed with the Council the need to make improvements to more local streets then are currently budgeted for in the capital replacment plan. On September 24, 2012, the City Council authorized the preparation of the feasibility report. On November 7, 2012, staff held an Open House for the Greenwood Shores neighborhood; approximately 40 residents attended. On November 14, 2012, staff held an Open House for the Horseshoe /Indian Hill and Sandy Hook neighborhoods; approximately 40 residents attended. On November 15, 2012, staff held an Open House for the Melody Hill neighborhood; approximately 30 residents. Residents' comments regarding the proposal will be included in the appropriate public hearing packet. DISCUSSION Every year the City considers streets that are in poor condition to be rehabilitated or reconstructed. For the 2013 Street Rehabilitation Project, staff is proposing to rehabilitate approximately 4.6 miles of streets. The street segments within the proposed project were identified by the City's Pavement Management software in conjunction with site investigations and are shown below. Chanhassen is a Community for Life - Providing for Today and Planning for Tomorrow 2013 Street Rehabilitation Project December 10, 2012 Page 2 Melody Hill �. Horseshoe Curve & M Indian Hill Road .K L ¢ Greenwood Shores > s Sandy Hook A S.ts y R�Daretum 8otslcvarcl �-+� _ .r /,� Iy H The proposed improvements generally consist of milling and overlaying the pavement surface. Severe pavement and subgrade distresses will be removed and replaced. Minor drainage improvements are also proposed to be addressed in the project areas. The watermain in these areas is thought to be in relatively good condition since there are no major watermain breaks in the areas. The gate valves and hydrants in these areas are getting to the age were bolts have a tendency to fail so the watermain gate valve bolts are proposed for replacement in these areas. Some hydrants have also been identified as needing replacement because they have mechanical problems. These hydrants are also proposed for replacement. A feasibility report was prepared by the Engineering Dept. staff. It is estimated the City will save about $150,000 with feasibility report preparation, design and construction observation not being outsourced. A copy of the feasibility report is available in the Engineering Department. Below is a summary of the feasibility findings. Project Area #1: Greenwood Shores Approximately 1.8 miles of streets are proposed to be full depth milled and overlaid within the Greenwood Shores neighborhood located between Powers Boulevard and Lake Lucy. The streets in this area are 37 years old and were last sealcoated in 1992 and 1997. Redman Lane and Shawnee Lane had a thin overlay paved by the Street Department in 2000 to keep the street from completely deteriorating. Over the last several years, the Street Department has had to significantly patch this area due to the condition of the streets. gAeng \pub1ic \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 3 The street conditions in this area were last surveyed in 2010. The Pavement Condition Indices (PCIs) from the survey are shown on the map below. A PCI below 45 typically warrants reconstruction; however, the utilities in the area are in fair condition and therefore staff is recommending a full depth mill and overlay of the streets at this time. Subgrade corrections would be done as needed. L { i; -0• L.,...� , Staff has completed a storm sewer analysis of this area. It has been the City's practice to urbanize neighborhoods with adding concrete curb and gutter and include an engineered storm sewer system when major projects are proposed. In order to urbanize neighborhood streets, storm water treatment is a critical component. In this neighborhood very little opportunity is available to properly treat storm water runoff. There is no space available to treat the runoff in ponds that meet the City's storm water quality requirements therefore staff is proposing to replace the streets and not add concrete curb and gutter or additional storm sewer infrastructure. Staff is proposing to replace the existing bituminous curb in the area to help direct runoff. The storm sewer pipes in this neighborhood are gAeng \pub1ic \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 4 generally galvanized pipe. The pipes are generally in poor condition. The Street Department has inspected this storm sewer and determined that most sections of pipe under the streets need to be replaced. It is proposed to replace the galvanized pipe under the streets at this time with reinforced concrete pipe. Most of the catch basins in the streets are also proposed to be replaced. Drain tile is also proposed to be incorporated into the design to alleviate some groundwater problems. Environmental manholes are proposed to be added at discharge points along the lake and wetland to capture floatable debris and sediment. Four St. Anthony Falls Laboratory Baffles (or SAFL Baffles) are proposed to be installed for water quality purposes. Staff has reviewed the storm sewer and determined that some of the pipes should be resized to help with larger rain events. Staff is planning to meet with residents at the north end of Utica Circle to discuss the possibility of installing a rain garden on their property. A map showing the existing storm sewer and drainage boundaries is shown below. �3 Y ` : It Ni g: \eng \public \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx # 11 4 It Ni g: \eng \public \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 5 Staff had the sanitary sewer system televised in this area. The system is in fair condition with only minor repairs identified at this time. The repairs are recommended for inflow and infiltration issues. The main sanitary sewer improvements proposed are I/I barriers for sanitary manholes. The watermain in this area is ductile iron. City records do not show any watermain breaks in this area however, the soils are shown to be somewhat corrosive based on the soils information. It is recommended to replace the bolts on the valves and some hydrants at this time. Staff is planning to add a watermain anode bag that acts as sacrificial material to help prolong the life of the mains. Protect Area #2: Melody Hill Area This project area consists of 1.2 miles of streets southeast of the intersection of Trunk Highway 7 and Trunk Highway 41. Chaska Road was built in 1963, Melody Hill Road and Murray Hill Road in 1971, Crestview Drive and West 65th Street in 1979, and Whitetail Ridge Court in 1988. The streets were sealcoated in 1994, 1999 and 2007. The map below summarizes the pavement condition indices (PCIs) and the construction year for each street section. A PCI of 100 represents a new street. For a local street, a PCI between 45 and 65 typically warrants a mill and overlay. The streets are recommended to be full depth milled and overlaid. Subgrade corrections would be completed as needed. There is no concrete curb and gutter within this project area. The area is fully developed with little opportunity to construct conventional storm water management facilities. Staff is not proposing to add concrete curb and gutter. Staff has gather information on the existing storm sewer pipes and gAeng \public \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 6 draintile within the area. Additional draintile is recommended to be added along Melody Hill, Chaska Road, Melody Hill, 65 street. Culvert replacement is recommended on White Tail Ridge Court. The sanitary sewer material within the Melody Hill neighborhood is PVC and vitrified clay pipe (VCP). The sanitary sewer pipe has been televised. There are no known significant problems with the sanitary sewer. Cast iron watermain pipe is within Murray Hill Road, Melody Hill Road (TH 41 to Murray Hill Road) and in West 65th Street. The remaining watermain in the project area is ductile iron pipe. The only documented watermain break in the area is on West 65th Street, which occurred in 2003. Staff recommends that the gate valve bolts be replaced in conjunction with the project. Typically, gate valve bolts that are in the ground and exposed to soils for this length of time have a tendency to corrode and break. Anode bags should be added to all areas where the watermain is exposed. The types of hydrants in the area are not easy to maintain and can cause operational problems and most should be replaced. Project Area #3: Horseshoe /Indian Hill Area The streets within this project area were constructed in 1978 and were sealcoated in 1994, 1999 and 2007. Heavy patching of the roads took place in 2011. The estimated PCIs are shown on the map. A full depth mill and overlay is proposed. No major storm sewer improvements are proposed with this project area since the area is essentially fully developed. The watermain within this area is ductile iron pipe. There are no known watermain breaks within this area. It is recommended to replace the bolts on the valves and some hydrants at this time. Attaching anode bags to the watermain at every watermain excavation is also recommended. The sanitary sewer is ABS pipe. The sanitary sewer has been televised to determine if there are any structural deficiencies and/or inflow /infiltration issues with the pipe. Project Area #4: Sandy Hook Area Most of the streets in the Sandy Hook area were constructed in 1975. Sandy Hook Circle was constructed in 1981. Sandy Hook Drive and Sandy Hook Circle were sealcoated in 2001 and heavily gAeng \pub1ic \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 7 patched in 2000 and 2011. Dakota Avenue and Dakota Circle were sealcoated in 1995 and 2001 and heavily patched in 2011. Cheyenne Trail was sealcoated in 1995 and heavily patched in 2001 and 2011. Despite the maintenance history in the project area, the pavement condition is still poor with the estimated PCIs between 13 and 34. The preliminary design that was discussed at the neighborhood meeting for Sandy Hook Circle was a full depth mill and overlay. Since the neighborhood meeting, the soils investigation report has been completed. Based on the soils report and onsite investigation, staff is now recommending Sandy Hook Circle be edge milled and a 2" overlay be paved. The other areas in this neighborhood are still recommended to have a full depth mill and overlay. This design change has also lowered the proposed assessment amount for Sandy Hook Circle. .. F }fig �£ # cv y '5 P Due to the fully- developed condition within this area, there is little opportunity to install stormwater management facilities within the area. Staff is planning to meet with the residents along the Sandy Hook Road cul -de -sac and Dakota Avenue to discuss opportunities to install rain gardens. A map of the existing storm sewer and drainage area boundaries is shown below. gAeng \public \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 8 The watermain within this area is ductile iron pipe. There are no documented watermain breaks. It is recommended to replace the bolts on the valves and some hydrants at this time. Attaching anode bags to the watermain at all excavated watermain areas is recommended. The sanitary sewer in this area is PVC pipe. There are no known issues with the sanitary sewer pipe. The sanitary sewer has been televised to determine if there are any structural deficiencies and/or inflow /infiltration issues with the pipe. PROJECT FUNDING Special assessments to the benefitting properties are proposed to pay for a portion of the proposed 2013 Street Improvement Project No. 13 -01 per the City's assessment practice. The remaining project costs are proposed to be paid from City funds. All the utility improvements are proposed to be paid for by the associated utility fund. The preliminary funding is shown below: Funding Source Estimated Amount Project Cost Budgeted Assessments/Revolving Assessment Fund Storm Water Management Fund Water Utility Fund Sanitary Sewer Utility Fund $1,689,900 $119,200 $174,870 $28,715 $1,695,000 $125,000 $175,000 $150,000 $2,012,685 $2,145,000 gAeng \public \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx 2013 Street Rehabilitation Project December 10, 2012 Page 9 The Rice Marsh Lake Trail Loop will also be funded with the revolving assessment funds. The amount budgeted is $200,000 and is not included in the budget amounts listed above. This trail loop will be bid separately and is not part of the proposed 2013 Street Rehabilitation project. Each project area would have its own proposed assessment, which is summarized below: Area #1: Area #2: Area #3: Area #4b: Greenwood Melody Horseshoe/ Area Ho Sandy Hook Shores Hill Indian Hil Sandy Hook Circle Total Estimated Street Cost* Assessed Amount (40% of the Total) No. of assessable units (as of 11 -30 -2012) Estimated unit assessment based on soils information $249,799 $187,546 85 65 $154,717 $61,887 46 $2 5 938.81 $2,885.32 $1,345.37 Estimated unit assessment presented at the $3,125.19 $3,025.90 $1,692.61 November, 2012 Open Houses *Cost estimates include 5% indirect costs and 8% contingency. SCHEDULE The proposed project schedule is as follows: Public Hearing, Greenwood Shores area Public Hearing, Melody Hill area Public Hearing, Horseshoe /Indian Hill & Sandy Hook areas Order Plans & Specifications Approve Plans & Specifications; Order Ad for Bids Assessment Hearing Project Begins Substantial Completion Attachment: Resolution $395,779 $158,312 55 $2,878.40 $2,972.10 $46,040 $18,416 18 $1,023.11 $2,972.10 January 14, 2012 January 28, 2012 February 11, 2013 February 11, 2013 February 25, 2013 April 22, 2013 June, 2013 August 30, 2013 gAeng \pub1ic \_2013 projects \13 -01 street rehab \12 -10 -2012 accept feasibility.docx CITY OF CHANHASSEN CARVER AND HENNEPIN COUNTIES, MINNESOTA DATE: December 10, 2012 RESOLUTION NO: 2012- MOTION BY: SECONDED BY: A RESOLUTION ACCEPTING FEASIBILITY STUDY AND CALLING THE PUBLIC HEARINGS FOR THE 2013 STREET REHABILITATION PROJECT NO. 13 -01 WHEREAS, pursuant to resolution of the Council adopted September 24, 2012, a report has been prepared by City staff with reference to the above - referenced project, and this report is being received by the Council on December 10, 2012, and WHEREAS, the report provides information regarding whether the proposed project is necessary, cost - effective, and feasible. NOW, THEREFORE, BE IT RESOLVED by the Chanhassen City Council: 1. The Council will consider the improvement of such project in accordance with the report and the assessment of abutting properties for a portion of the cost of the improvement pursuant to Minnesota Statutes, Chapter 429 at an estimated total cost of the street improvements of $1,689,900. 2. Public hearings for the proposed improvements within the 2013 Street Rehabilitation Project No. 13 -01 shall be held in the Council Chambers of City Hall at 7:00 PM as stated below: On the l4th day of January, 2013 for the Greenwood Shores neighborhood, and On the 28th day of January, 2013 for the Melody Hill area, and On the 11th day of February, 2013 for the Horseshoe /Indian Hill and Sandy Hook areas. The clerk shall give mailed and published notice of each hearing and improvement as required by law. Passed and adopted by the Chanhassen City Council this 10 day of December, 2012. ATTEST: Todd Gerhardt, City Manager Thomas A. Furlong, Mayor YES NO ABSENT