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VII.2. Central Avenues Improvements Scoping Study – City Project 2024-10; Klingbeil CITY OF HOPKINS City Council Report 2024-0103 To: Honorable Mayor and Council Members Mike Mornson, City Manager From: Eric Klingbeil, PE, City Engineer Date: September 3, 2024 Subject: Central Avenues Improvements Scoping Study, City Project 2024-10 _____________________________________________________________________ OVERVIEW At the April 16, 2024 City Council meeting, staff was directed to perform topographic survey and prepare a Project Scoping Study for Central Avenue Phase 2 Improvements, City Project 2024-10. This study is now complete, and staff is looking for Council direction. SUPPORTING INFORMATION Central Avenue Phase 2 Project Scoping Study Report o Portions attached, entire report available upon request ANALYSIS OF ISSUES Traditionally, a feasibility report is the first stage of an assessable street and utility improvement project, but with concerns of timing and project costs a topographic survey and a Project Scoping Study of all remaining areas in the Central Avenues needing reconstruction was completed at the direction of council to provide multiple scenarios of phasing, contracts, timing, and cost of completing the remaining work. This scoping study could be considered a preliminary feasibility report. After reviewing the infrastructure needs and analyzing multiple phasing, contract, and timing scenarios, three main options were considered in depth with multiple contract scenarios for each option. There are pros and cons of each option. Option A – Complete the improvements in two years. This option has the lowest total project cost, the lowest risk of catastrophic utility failure, and the lowest pavement maintenance needs. This option does have a higher cost per year than the other options due to the shorter time frame. This option could be completed with one contact covering both phases, similar to the 2020-2021 Street and Utility Improvement project completed in the Interlachen Park Neighborhood, or it could be done as two discrete projects each bid on their own in separate years. Public Works Dept. Option B – Complete the improvements in three years in two unequally sized phases. This option has a higher total project cost than Option A, but has a more budget friendly project in 2025 with larger sized projects in 2026 and 2027. There is an elevated risk of utility failure and increase interim pavement maintenance costs with this option due to the longer timeframe. This option does have a lower per year cost than Option A, but does have a higher overall project cost. This option could be completed under two separate construction contracts (one smaller one year single phase project, and one larger two year two phase project), or it could be completed as three discrete projects over three years. Option C – This option is like Option B, but it completes the work in three similar sized projects over three years. It was decided to not consider one-three year project after discussion with several contractors who indicated that a three year project introduces a level of risk that begins to negatively affect bid prices. Project Costs The construction work being performed in all options is equal, the variables affecting total project costs between options are project size, increased construction/material costs over time and the number of contracts/projects required. Larger quantities of work typically equate to more favorable unit prices. Construction and material costs continue to rise year over year, and this is anticipated to continue. The largest cost savings can be realized by minimizing the number of discrete construction contracts required to complete the work, it is anticipated that one-two year project in Option A will be more than $1,000,000 cheaper than three-one year projects as in Option C. Project Schedule If council directs staff to move forward, the anticipated schedule is as follows: Order Feasibility September 10, 2024 Mail Resident Questionnaire/Meeting Invite September 11, 2024 Neighborhood Meeting #1 October 2, 2024 Council Set Public Hearing Date/Present Feasibility October 15, 2024 Neighborhood Meeting #2 November 7, 2024 Public Hearing/Order Final Plans/Specifications November 12, 204 Approve final plans/order bids Late Jan/ Early Feb, 2025 Bid Opening Late Feb/Early Mar, 2025 Order Assessment Hearing March, 2024 Neighborhood Meeting #2 Late Mar/Early Apr, 2025 Conduct Public Assessment Hearing April, 2025 Adopt Assessment Roll/Award Contract April, 2025 Begin Construction Spring 2025 Staff Recommendation Staff is looking for council direction on how to proceed. With Council direction, staff will return at the September 10, 2024 City Council Meeting with an item for council to direct staff to prepare a Feasibility Report for the proposed improvements. Staff recommends Option A with one construction contract for a 2 year project, with construction starting in Spring 2025. This is the most cost effective option when the entire project area is considered. It also reduces the risks associated with utility failures and interim pavement maintenance needs. Submitted by: Nicholas J. Amatuccio, P.E. Senior Associate Project Manager nicholas.amatuccio@bolton-menk.com Bolton & Menk, Inc. 12224 Nicollet Avenue Burnsville, MN 55337 P: 952-890-0509 Central Avenues Phase 2 Project Scoping Study Report City of Hopkins Prepared by: Bolton & Menk, Inc. Certification Central Avenues Phase 2 ǀ BMI 24X.134763.000 Certification Project Scoping Study Report for Central Avenues Phase 2 City of Hopkins August 2024 PROFESSIONAL ENGINEER 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. Signature: Typed or Printed Name: Nicholas J. Amatuccio, PE Date: 8/20/2024 License Number: 53639 Prepared by: Bolton & Menk, Inc. Table of Contents Central Avenues Phase 2 ǀ BMI 24X.134763.000 Table of Contents I. Executive Summary .............................................................................................................................. 1 Background Information ............................................................................................................... 1 Proposed Improvements .............................................................................................................. 1 Estimated Costs and Proposed Funding ....................................................................................... 2 II. Scoping Study Introduction .................................................................................................................. 3 III. Background........................................................................................................................................... 3 IV. Existing Conditions ............................................................................................................................... 4 Streets ........................................................................................................................................... 4 Storm Sewer ................................................................................................................................. 6 Sanitary Sewer .............................................................................................................................. 7 Watermain .................................................................................................................................... 8 V. Proposed Improvements ...................................................................................................................... 8 Streets ........................................................................................................................................... 8 Storm Sewer ............................................................................................................................... 11 Stormwater Management .......................................................................................................... 12 Sanitary Sewer ............................................................................................................................ 13 Watermain .................................................................................................................................. 14 Pedestrian Facilities .................................................................................................................... 15 Boulevard Trees .......................................................................................................................... 16 VI. Estimated Costs and Funding ............................................................................................................. 17 VII. Right-of-Way/Easements/Permits ...................................................................................................... 19 VIII. Project Phasing ................................................................................................................................... 19 IX. Conclusion and Recommendations ..................................................................................................... 20 X. Project Schedule ................................................................................................................................. 21 Tables Table ES-1 – Estimated Cost of Proposed Central Avenues Phase 2 Improvements .................................... 2 Table 1: Summary of Existing Corridor Conditions ...................................................................................... 5 Table 2: Summary of Geotechnical Evaluation ............................................................................................ 6 Table 3: Proposed Sanitary Sewer Improvements ..................................................................................... 14 Table 4: Proposed Watermain Improvements ........................................................................................... 15 Table 5: Estimated Cost of Proposed Central Avenues Phase 2 Improvements ........................................ 17 Prepared by: Bolton & Menk, Inc. Table of Contents Central Avenues Phase 2 ǀ BMI 24X.134763.000 Appendix Appendix A: Figures Appendix B: Preliminary Cost Estimates Appendix C: Geotechnical Evaluation Prepared by: Bolton & Menk, Inc. Executive Summary Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 1 I. Executive Summary Background Information The Hopkins City Council ordered the preparation of this project scoping study report at its May 7, 2024 meeting. The scoping study has been completed to better identify the infrastructure improvements that are still needed within the Central Avenues neighborhood after the completion of the 2024 Central Avenues Improvements project, to define costs associated with the improvements, and to evaluate different project phasing scenarios knowing that the remaining improvements will span over at least two constructions seasons. Proposed Improvements This report examines potential street and utility construction of several streets in the Central Avenues Neighborhood in the City of Hopkins. These areas are depicted in Figure 1 of Appendix A. The proposed improvements are described in the body of this report and are graphically illustrated in Appendix A. In brief, the proposed improvements consist of: • Full reconstruction of the following street sections in the Central Avenues Neighborhood with replacement of concrete curb and gutter and concrete sidewalk, and replacement or rehabilitation of watermain, sanitary sewer, and storm sewer utilities. o 9th Ave N from 1st St N to 3rd St N o 10th Ave N from 1st St N to 4th St N o 11th Ave N from 1st St N to Minnetonka Mills Rd o 12th Ave N from 1st St N to Highway 7 o 13th Ave N from the dead-end north of Maetzold Field to South Service Dr o 3rd St N from 9th Ave N to 11th Ave N o 4th St N from 9th Ave N to 10th Ave N and from 11th Ave N to 12th Ave N • Reclamation and resurfacing of 3rd St N from 11th Ave N to 15th Ave N. • Mill and overlay of 2nd St N from 8th Ave N to 12th Ave N. Prepared by: Bolton & Menk, Inc. Executive Summary Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 2 Estimated Costs and Proposed Funding Cost estimates have been prepared to address the varying needs of all areas reviewed. Detailed cost estimates are provided in Appendix B and summarized below in Table 1. Table ES-1 – Estimated Cost of Proposed Central Avenues Phase 2 Improvements Streets $5,013,000 Pedestrian Facilities $1,440,000 Sanitary Sewer $2,356,000 Watermain $2,785,000 Storm Sewer $2,062,000 Construction Cost with Contingencies (20%) $16,387,000 Engineering & Administration (20%) $3,277,000 Total Estimated Project Costs $19,664,000 These improvements would be funded with general obligation bonds, utility funds, and assessments to individual properties. The chart below illustrates proposed funding sources inclusive of contingencies, engineering, and administration. PIR (BONDS, GENERAL TAX LEVY), $7,549,906 , 38% SPECIAL ASSESSMENTS, $2,521,743 , 13% WATER FUND, $3,586,746 , 18% SANITARY SEWER FUND, $3,037,077 , 16% STORM SEWER FUND, $2,968,744 , 15% FUNDING SOURCES Prepared by: Bolton & Menk, Inc. Scoping Study Introduction Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 3 II. Scoping Study Introduction This scoping study report examines future street and utility improvements including storm sewer replacement, water main replacement, sanitary sewer replacement, and street reconstruction or resurfacing throughout the Central Avenues Neighborhood. The following streets that will be included in this study are shown on Figure 1 in Appendix A and listed below: • 9th Ave N from 1st St N to 3rd St N • 10th Ave N from 1st St N to 4th St N • 11th Ave N from 1st St N to Minnetonka Mills Rd • 12th Ave N from 1st St N to Highway 7 • 13th Ave N from the dead-end north of Maetzold Field to South Service Dr • 2nd St N from 8th Ave N to 12th Ave N • 3rd St N from 9th Ave N to 15th Ave N • 4th St N from 9th Ave N to 10th Ave N and from 11th Ave N to 12th Ave N The improvements on these streets will include some or all of the following proposed work: • Addition/replacement of storm sewer • Watermain replacement • Water service replacement • Sanitary sewer replacement • Sanitary sewer rehabilitation • Sanitary sewer service replacement • Concrete curb & gutter replacement • Bituminous street removal and reconstruction • Bituminous street resurfacing • Concrete sidewalk replacement III. Background The Central Avenues Neighborhood has been included in the City’s Capital Improvement Plan in some capacity for the several years. The Hopkins City Council ordered the preparation of this project scoping study report at its May 7, 2024 meeting. The scoping study has been completed to better identify the infrastructure improvements that are still needed within the Central Avenues neighborhood after the completion of the 2024 Central Avenues Improvements project, to define costs associated with the improvements, and to evaluate different project phasing scenarios knowing that the remaining improvements will span over at least two constructions seasons. This report will be used as the basis for City Staff recommendations to Council, which may include the request to order a feasibility report for a defined project area and scope to be constructed in 2025 or later. Prepared by: Bolton & Menk, Inc. Existing Conditions Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 4 IV. Existing Conditions Streets The bituminous streets within the project areas are aged and exhibit various levels of wear and distress. This is evident on the surface by transverse, block, and alligator cracking. There is evidence of previous additional street repairs and maintenance throughout the project area including numerous street patches. Examples of the existing pavement conditions are shown below (pictures were taken on 12th Ave N between 1st St N and 2nd St N). Consistent with observations of the existing pavements made during preparation of this report, the City of Hopkins’ Pavement Management System also indicates that the “Pavement Condition Index” (PCI) for several streets in the neighborhood are in fair or poor condition and beyond the pavement’s life cycle. The streets within the project area have varying widths (measured curb face to curb face). Table 1 below summarizes these and other existing conditions. Parking is typically allowed on both sides of the streets throughout the neighborhood. Large, mature trees can be found throughout the project within the City’s ROW and near the back of curb. Prepared by: Bolton & Menk, Inc. Existing Conditions Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 5 Table 1: Summary of Existing Corridor Conditions Roadway Existing Street Width Existing Curb Type Existing ROW Width 9th Ave N 35 feet Concrete B618 Curb & Gutter 66 feet 10th Ave N 36 feet Concrete B618 Curb & Gutter north of the regional trail; some Curb w/ no gutter south of the regional trail 66 feet 11th Ave N 31 feet – 35 feet Concrete B618 Curb & Gutter 66 feet 12th Ave N 36 feet Concrete B618 Curb & Gutter north of the regional trail; mostly Curb w/ no gutter south of the regional trail 66 feet 13th Ave N 36 feet Concrete B618 Curb & Gutter south of 4th St N; Curb w/ no gutter north of 4th St 66 feet 2nd St N 36 feet Concrete B618 Curb & Gutter 66 feet 3rd St N 30 feet Concrete B618 Curb & Gutter west of 11th Ave N; mixture of Concrete B618 Curb & Gutter and Curb w/ no gutter between 11th Ave N and 9th Ave N 60 feet 4th St N 36 feet Curb w/ no gutter 66 feet Subgrade soil sampling was completed throughout the neighborhood by Braun Intertec in the Summer of 2024. A copy of Braun Intertec’s Geotechnical Evaluation Report is included in Appendix C of this report. Twenty-two soil borings and five pavement cores were taken throughout the area and summarized in Table 2 below. Prepared by: Bolton & Menk, Inc. Existing Conditions Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 6 Table 2: Summary of Geotechnical Evaluation Street Bituminous Thickness Subgrade Material 9th Ave N 4 inches – 5.5 inches Mixture of silty and clayey sand 10th Ave N 4 inches – 9 inches Mixture of silty, clayey, and poorly graded sand 11th Ave N 4.5 inches – 8 inches Mixture of silty, clayey, and poorly graded sand; gravel with silt; sandy silt; and sandy lean clay 12th Ave N 4.5 inches – 6.5 inches Mixture of silty, clayey, and poorly graded sand; and sandy lean clay 13th Ave N 4 inches – 6.5 inches Mixture of silty, clayey, and poorly graded sand with silt; and lean and sandy lean clay 2nd St N 3.5 inches – 5.5 inches Aggregate base material 3rd St N 2 inches – 6.5 inches Mixture of silty, clayey, and poorly graded sand with silt; lean clay; sandy silt; and possible buried asphalt 4th St N 4.5 inches to 6.5 inches Mixture of silty, clayey, and poorly graded sand; and sandy lean clay The soils found just beneath pavements in the neighborhood were most commonly fill soils classified as poorly graded sand, silty sand, clayey sand, sandy silt, or lean clay. At least one of the borings in the neighborhood found slightly organic clay (buried topsoil). Buried topsoil is an undesirable material for roadway construction as it’s unable to adequately support heavy vehicles, leading to earlier failure of overlying pavements. Storm Sewer The existing storm sewer systems serving the neighborhood are mostly comprised of reinforced concrete pipe (RCP), varying in size from 12-inch diameter to 60-inch diameter, with some 12-inch diameter clay pipes as well. The storm sewer catch basins and manholes are a mixture of precast concrete and block structures. The neighborhood generally drains south through an existing 60-inch trunk storm sewer main along the alley between 11th Ave N and 10th Ave N, south of 3rd St N, then turns down 11th Ave N, west on Mainstreet over to 13th Ave S ultimately discharging to Nine Mile Creek near south of Excelsior Blvd. Some of the neighborhood drains to the east and south before turning west south of Mainstreet, but ultimately connects to the same trunk storm sewer system as the rest of the neighborhood that discharges to Nine Mile Creek south of Excelsior Blvd. Drainage issues have been identified throughout the neighborhood through evaluation of site grades and elevations by the project team and visual inspections from site visits. These drainage issues can be generalized as: 1. Due to the flat grades of some of the streets, especially from 2nd St N to 3rd St N on Prepared by: Bolton & Menk, Inc. Existing Conditions Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 7 9th Ave N, 10th Ave N, and 11th Ave N, localized drainage problems are prevalent. 2. There is a lack of catch basin inlets at a few of the intersections in the project area, and these limited catch basins can be overloaded during heavier rain events which causes ponding in the street. 3. There is a lack of gutters along several of the streets to adequately direct water through areas of flat topography to drainage inlets. 4. Many of the sidewalks throughout the neighborhood have isolated low spots and do not drain well after rain events or during snow melt. Proposed storm sewer improvements are discussed later in this report. Sanitary Sewer The existing sanitary sewer system throughout the neighborhood primarily consists of 8-inch diameter clay pipe, except for the following blocks that differ in either material or size: • 11th Ave N from 2nd St N to 3rd St N and 2nd St N from 10th Ave N to 11th Ave N consists of 12-inch diameter clay sewer pipe. • 11th Ave N from 1st St N to 2nd St N consists of 15-inch diameter clay sewer pipe. o The sewer pipe on this block is also deeper than the rest of the sanitary sewer system in the neighborhood at over 20 feet in depth with tall risers off the main for each sanitary sewer service. • 2nd St N from 8th Ave N to 10th Ave N consists of 10-inch diameter clay sewer pipe. • An 8-inch PVC (plastic) sewer pipe runs up the alley between 9th Ave N and 10th Ave N from 2nd St N to 4th St N, which serves Alice Smith Elementary School and Eisenhower Elementary School across Highway 7. o While this pipe consists of newer material than the rest of the neighborhood, the pipe is in somewhat poor condition with sags, deflections, and dents in the interior of the pipe based on televising in the last 10 years. o It is also not ideal to have a sanitary sewer with a larger flow run down an alley with limited right-of-way for access, maintenance, and repairs. Clay pipe is susceptible to infiltration and root intrusion over time due to the large number of joints and the deterioration of the gasket material originally used to seal the joints. The project’s sanitary manholes are made of a mixture of brick, concrete block, and precast concrete structures. Brick and block structures were typically built around the 1950’s/1960’s or earlier, whereas precast structures indicate these structures were replaced at some point after initial construction of the other infrastructure, likely in response to some deficiency with the original structure while some were replaced as part of an adjacent reconstruction project in the past 15 years. Brick and block manholes are susceptible to infiltration over time due to cracks and deterioration of the mortared joints. Precast concrete manholes continue to be used in modern construction and are generally acceptable provided proper gaskets were provided with the initial construction and remain in good working order. Service lines in the neighborhood are typically 4-inch or 6-inch and their material may be clay, cast iron, orangeburg, transite, or PVC. Clay and orangeburg sanitary sewer pipes are highly susceptible to infiltration by groundwater, causing groundwater to be treated by the Met Council at its treatment facilities downstream at a cost to the public. The vast majority Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 8 of sanitary sewer mains and service lines in the neighborhood are made of clay material. Based on observations of sewer service replacements to individual properties performed recently in nearby neighborhoods, potential exists for encountering orangeburg sewer service pipes during construction of the project. Orangeburg pipe, which can generally be described as layered tar paper wrapped in a round manner to create a pipe, was commonly installed around the time several neighborhoods in Hopkins originally developed. Orangeburg pipe is widely known to ‘rot’ where exposed to water, generally on the bottom of the pipe, and ultimately collapse as it ages and is unable to support the surrounding soil. Proposed sanitary sewer improvements are discussed later in this report. Watermain The water main throughout the neighborhood is primarily 6-inch cast iron pipe (CIP). CIP is a common watermain material, however upon reaching its useful life tends to fail. Because it is so brittle, as the soils around the pipe move slowly over decades, CIP cannot support shearing forces and ultimately breaks. These portions of the watermain system were installed in the 1950s and 1960s. CIP installed around this time period was also occasionally installed with lead-packed fittings. Service lines for single family homes in the project area are typically ¾-inch or 1-inch and their material may be copper, galvanized steel, or lead. However, lead service material (outside of fittings) have not been found on recent reconstruction projects on adjacent streets in the Central Avenues neighborhood. Proposed watermain improvements are discussed later in this report. V. Proposed Improvements Streets Several of the streets within the neighborhood have reached a point where maintenance procedures such as seal coating or milling and overlaying are no longer cost-effective strategies. In addition, the age and material of the underground sewer and water throughout the neighborhood requires that most of the streets are fully reconstructed after the replacement of these utility mains and services nearing the end of their life expectancy. The streets that would be recommended for full reconstruction include: • 9th Ave N from 1st St N to 3rd St N • 10th Ave N from 1st St N to 4th St N • 11th Ave N from 1st St N to Minnetonka Mills Rd • 12th Ave N from 1st St N to Highway 7 • 13th Ave N from the dead-end north of Maetzold Field to South Service Dr • 3rd St N from 9th Ave N to 11th Ave N • 4th St N from 9th Ave N to 10th Ave N and from 11th Ave N to 12th Ave N Proposed reconstruction improvements include replacement of concrete curb and gutter and replacement of the full depth of the pavement section with underlying aggregate base. It is also recommended to install a sand section under the aggregate base for additional roadway stability and pavement longevity. Concrete curb will be replaced per City Policy 8.02 with B618 concrete curb and gutter, which will help extend the life of the pavement by keeping water out of the subgrade and will provide a solid edge for the asphalt pavement. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 9 Some of the streets within the neighborhood, including blocks of 10th Ave N, 12th Ave N, 13th Ave N, 3rd St N, and 4th St N, do not have an existing concrete gutter, just a curb back which does not convey stormwater effectively. Existing drainage patterns will be maintained and the elevation of the existing roadways at their edge is proposed to approximate the existing elevations. Attempts at lowering the road will be made (during final design) where appropriate to improve drainage within and toward the street where beneficial and practical. Proposed street widths from face of curb to face of curb will vary from street to street throughout the neighborhood but will generally be narrowed on reconstructed streets to the City’s standard width for residential streets (28 feet wide from curb face to face) where feasible. Using a proposed street width of 28 feet will provide a consistent street width along each roadway’s length, reduce impervious area to reduce costs and stormwater management needs, and create a wider turf boulevard for healthier trees, additional snow storage, and increased pedestrian safety. The following specific improvements are proposed for each unique roadway corridor: • 9th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 28 feet wide from curb face to face. This will narrow the road by approximately 7 feet. Parking regulations will remain consistent with existing conditions throughout this area. • 10th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 28 feet wide from curb face to face. This will narrow the road by approximately 8 feet. Parking regulations will remain consistent with existing conditions throughout this area. • 11th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 28 feet wide from curb face to face. This will narrow the road by approximately 3 feet on the north end of 11th Ave, and up to 7 feet near 1st St N. Parking regulations will remain consistent with existing conditions throughout this area. • 12th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 36 feet wide from curb face to face. This road is proposed to remain the same width at 36 feet due to it being a state aid route, truck route, and corridor that is used for additional parking, especially along Maetzold Field south of 2nd St N. Parking regulations will remain consistent with existing conditions throughout this area. • 13th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 28 feet wide from curb face to face. This will narrow the road by approximately 8 feet. Parking regulations will remain consistent with existing conditions throughout this area. • 3rd St N from 9th Ave N to 11th Ave N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 28 feet wide from curb face to face. This will narrow the road by approximately 2 feet. Parking regulations will be consistent with existing conditions throughout this area. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 10 • 4th St N is proposed to be reconstructed, including the replacement of concrete curb and gutter, at 36 feet wide from curb face to face. This road is proposed to remain the same width at 36 feet because the two blocks that are proposed for reconstruction are not adjacent to each other and this will maintain a consistent street width along the 4th St N corridor. Parking regulations will remain consistent with existing conditions throughout this area. The minimum proposed street grade is 0.50% consistent with City standards. Street grades flatter than 0.50% are undesirable for drainage. In some areas, new low-points with adequate storm sewer will need to be created to increase roadway longitudinal slope for proper drainage. These locations will be confirmed during the final design process, but a few locations have been identified based on a review of the existing topography and site conditions including 9th Ave N, 10th Ave N, and 11th Ave N between 2nd St N and 3rd St N. Overall drainage patterns/directions throughout the project area are not proposed to change. The preliminary proposed typical pavement section for all reconstructed streets consists of 2-inches wearing course bituminous pavement, 2-inches non-wear course bituminous pavement, 8-inches aggregate base class 5, 12-inches select granular, and spot subgrade soil corrections. The exception to this pavement section is on 12th Ave N, where a 3-inch non- wear course bituminous pavement section would be proposed due to the higher traffic levels, including truck traffic. Pavement maintenance is proposed for the following streets in the project area: • 2nd St N from 8th Ave N to 12th Ave N o A 2-inch mill and overlay is recommended based on the PCI rating and a geotechnical investigation of the existing pavement conditions, confirming this to be a feasible maintenance operation for the pavement. This will extend the life of the pavement at a significantly lower cost than full reconstruction. o The existing B618 curb and gutter is in relatively good condition, requiring minimal spot concrete repairs. o The original underground sanitary sewer from 8th Ave N to 11th Ave N can be rehabilitated without excavation using a CIPP (cured in place pipe) liner since there are no confirmed sewer services to replace along the corridor. This is discussed further in the proposed sanitary sewer improvements section later in this report. o There is no watermain along 2nd St N and the storm sewer is not in need of replacement except for the catch basin inlets at the intersections, which would be reconstructed with the improvements to 9th Ave N, 10th Ave N, 11th Ave N, and 12th Ave N. • 3rd St N from 11th Ave N to 15th Ave N o Reclamation and resurfacing with 2-inches wearing course and 2-inches non- wearing course bituminous pavement is recommended based on the PCI rating and a geotechnical investigation of the existing pavement conditions, confirming this to be a feasible maintenance operation for the pavement. While the Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 11 pavement is not in good enough condition for a cheaper mill and overlay operation, reclaiming the existing bituminous pavement and underlying aggregate base to pave a new bituminous pavement section overtop will extend the life of the pavement longer than a mill and overlay and still at a significantly lower cost than full reconstruction. o The existing B618 curb and gutter is in relatively good condition, requiring only spot concrete repairs. o The original underground sanitary sewer can be rehabilitated without excavation using a CIPP (cured in place pipe) liner since there are no confirmed sewer services to replace along the corridor. This is discussed further in the proposed sanitary sewer improvements section later in this report. o The original watermain from 11th Ave N and 13th Ave N has no confirmed services and is not needed for the water distribution system, so this watermain does not need to be replaced and can be abandoned without excavation. This is discussed further in the proposed watermain improvements section later in this report. o The storm sewer is not in need of replacement except for the catch basin inlets at some of the intersections, which would be reconstructed with the improvements to 13th Ave N, 12th Ave N, 11th Ave N, and 10th Ave N. Storm Sewer Most of the smaller 12-inch diameter storm sewer in the neighborhood would be reconstructed for constructability of other utilities, changing curb alignment, replacing aging materials, or increasing the storm water pipe capacities to meet City standards for a 10-year rainfall event. Storm sewer will generally be replaced in the same location as the existing system, other than some additional catch basin inlets and storm sewer pipe as needed for drainage. Most of the larger diameter storm sewer (27-inches and larger) is in good condition and would not be replaced as part of the proposed improvements. The following is a summary of the most significant improvements proposed to the storm sewer system, and proposed stormwater improvements are also shown on Figure 2 in Appendix A. • 12-inch diameter storm sewer along 12th Ave N (south of 3rd St N), 11th Ave N (north of 4th St N), and 4th St N would be replaced with 15-inch diameter storm sewer. • Storm sewer along 12th Ave N (north of 1st St N) would be replaced with a minimum pipe size of 24-inch diameter storm sewer. • Storm sewer would likely be extended down 9th Ave N, 10th Ave N, and 11th Ave N between 2nd St N and 3rd St N to mid-block, with additional catch basin inlets to create a new low point on this block with flat grades. This will improve drainage on this block by providing a location for the water to flow in the curb line. While other blocks in the project area are not as flat as these 3 blocks, they will also be evaluated further during final design to determine if additional storm sewer pipe and catch basins will be necessary for proper drainage. • Storm sewer catch basin inlets will be added and reconfigured at intersections to improve the efficiency of stormwater runoff collection during larger rain events, and to provide appropriate pedestrian ramp access. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 12 Stormwater Management The proposed improvements will result in more than 1 acre of land disturbance; therefore, stormwater management will be required by the Municipal Separate Storm Sewer System (MS4) General Permit and Nine Mile Creek Watershed District (NMCWD) with their updated rules to align with MS4 permit requirements. The water quality volume was calculated as one-half (0.5) inch times the sum of the new and fully reconstructed impervious surface (currently estimated to be 10.36 acres), equaling approximately 18,800 cubic feet of required water quality volume to be treated with the improvements for Central Avenues Phase 2. During preliminary and final design, the actual treatment volume will be verified, but feasible treatment options have been investigated to maximize the treatment of the water quality volume prior to discharge from the MS4: 1. Reduction in Impervious Surface o If determined to be an accepted treatment option by NMCWD, the reduction in impervious surface from narrowing the roads (a reduction of 1.23 acres) could provide up to 3,750 cubic feet of required water quality volume. o This would be at no additional cost to the project since it is already planned to be included in the improvements and is a cost savings due to the reduction in pavement area. 2. Perforated Infiltration Pipes along the west side of 12th Ave N by Maetzold Field o With no houses along this stretch of road and more boulevard space, underground large, perforated pipes could be installed to provide approximately 2,500 cubic feet of required water quality volume. o This treatment option is only viable if the soil types are favorable for infiltration which would be verified with preliminary design. o This treatment option would cost approximately $100,000. 3. Underground Chambers in the Parking Lot at 10th Ave N & 1st St N o A large City owned lot such as this parking lot is an ideal location for stormwater management. o Large chambers would be installed under the parking lot in a series of rows to provide up to 27,500 cubic feet of water quality volume, which would be in excess of the required treatment volume for the Central Avenues improvements area, but credits could be banked for future projects with the watershed. o This treatment option would cost approximately $800,000. ▪ This cost includes the removal and replacement of the parking lot (new paved and striped surface) and assumes a drain tile system which may not be needed if soil types are favorable for infiltration (to be verified with preliminary design). 4. Stormwater Wet Pond at Valley Park o This would be a backup treatment option if the above options become infeasible and would act as regional stormwater treatment downstream of the project area and within the Nine Mile Creek Watershed. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 13 o The pond would be about 10 to 12 feet deep to treat 2 feet of water that sits above the normal water level, and the pond could be located on the east edge of the park near the wooded area adjacent to Nine Mile Cove. o Additional site investigations, staff coordination, and community outreach would be necessary if this option is considered, but it could provide up to 34,000 cubic feet of water quality volume (nearly double the required treatment volume for the Central Avenues improvements area). o This treatment option would cost approximately $1,000,000 at the proposed size and assumed soil conditions/groundwater depths. A combination of the above treatment options will be proposed to meet the requirements of MS4 and NMCWD. Option 1 is already proposed as part of the improvements. Option 2 will be proposed as part of the improvements if soil conditions verify that infiltration is feasible. Option 3 will also be proposed as part of the improvements, pending direction from City Staff to allow an underground chamber system to be constructed under the public parking lot. Option 4 would only be considered as part of these improvements if the first three options are determined infeasible or do not provide enough water quality volume as required by MS4 and NMWCD. However, Option 4 or similar could be considered again in the future as part of the Parks Master Plan if not included with these improvements. Sanitary Sewer As summarized in the existing conditions section of this report discussing sanitary sewer, most of the existing system in the reconstruction area is relatively old, made of an outdated (clay) material, and in poor condition. Given these conditions, the opportunity to excavate to this utility given removal of overlying roadway pavement for street reconstruction, and the City of Hopkins policy to replace clay sewers during street projects, the existing clay gravity sanitary sewer system throughout the neighborhood is proposed to be replaced with PVC pipe or rehabilitated with a trenchless CIPP liner. An 8-inch PVC pipe was installed underneath the alley between 9th Ave N and 10th Ave N from 2nd St N to 4th St N to service the Alice Smith and Eisenhower Elementary schools. While this sewer is made from a current and acceptable pipe material, it has several significant defects and is located in an undesirable location (narrow alley right-of-way) for maintenance or future repairs. The proposed reconstruction of 10th Ave N and its sanitary sewer main provides an opportunity to replace and relocate the existing PVC sewer pipe beneath the alley. The 8-inch PVC pipe is proposed to be extended down 4th St N from 9th Ave N and connect to the existing sewer on 10th Ave N instead of turning down the alley between 9th Ave N and 10th Ave N. The sanitary sewer main along 10th Ave N between 4th St N and 2nd St N would be upsized to at least a 10-inch PVC sewer pipe to accommodate the additional flow from the elementary schools before connecting to the larger 12-inch sewer main along 2nd St N. After this sewer main in the alley is redirected to 10th Ave N, the deficient pipe in the alley can be abandoned in place with a grout or sand material without any excavation outside of the roadway. The clay sanitary sewer along 2nd St N and 3rd St N can be rehabilitated with a trenchless CIPP liner since there are no confirmed services that need to be replaced along these corridors and the sewer can remain its existing location. While most of the clay sewer mains along the avenues will be excavated and replaced with 8-inch to 12-inch diameter PVC pipe, the deep 15-inch diameter clay sewer main along 15th Ave N between 1st St N and 2nd St N would be proposed for rehabilitation using a CIPP liner. While this rehabilitation method is not typically used on streets designated for Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 14 reconstruction with many service laterals, the overly deep sewer main (20-feet below ground) makes open cut excavation costly and infeasible on a residential street. Not only would replacing a 20-foot-deep sanitary sewer main be expensive, but it would also be nearly impossible to maintain daily access to residents with slower progress and larger trenches. Due to the additional complexity and cost of full replacement of the sewer on this block, trenchless CIPP rehabilitation would be proposed. Existing sewer service wyes and laterals may also be lined from inside the main and/or from the right-of-way (ROW) line if found to be feasible and cost effective during the final design and bidding process. Where gravity mains are to be excavated and replaced, new service wyes will be provided to each home. Per City policy, sanitary services which are not PVC are proposed to be replaced with PVC pipe to the ROW line. New precast concrete manholes will be installed and will incorporate the City standard 27-inch diameter cover utilizing concealed pick-holes to minimize inflow and infiltration. The proposed sanitary sewer mainline improvements are summarized in Table 3 below and shown on Figure 3 in Appendix A. The exact age of the existing pipes listed in Table 3 could not be verified. Ages were reasonably estimated based on the existing pipe material and the known age of other utilities in the area. Table 3: Proposed Sanitary Sewer Improvements Roadway From/To Existing Pipe Proposed Improvements Dia. Matl. Age 9th Ave N 1st St N to 3rd St N 8” VCP (Clay) 1950 8” PVC 10th Ave N 1st St N to 2nd St N 8” VCP 1950 8” PVC 10th Ave N 2nd St N to 4th St N 8” VCP 1950 10” PVC 11th Ave N 1st St N to 2nd St N 15” VCP 1950 15” CIPP Liner 11th Ave N 2nd St N to 3rd St N 12” VCP 1950 12” PVC 11th Ave N 3rd St N to Minnetonka Mills Rd 8” VCP 1950 8” PVC 12th Ave N 1st St N to Highway 7 8” VCP 1950 8” PVC 13th Ave N Dead-End by Maetzold Field to South Service Dr 8” VCP 1950 8” PVC 2nd St N 8th Ave N to 10th Ave N 10” VCP 1950 10” CIPP Liner 2nd St N 10th Ave N to 11th Ave N 12” VCP 1950 12” CIPP Liner 2nd St N 11th Ave N to 12th Ave N N/A N/A N/A None/No Sewer 3rd St N 9th Ave N to 11th Ave N N/A N/A N/A None/No Sewer 3rd St N 11th Ave N to 15th Ave N 8” VCP 1950 8” CIPP Liner 4th St N 9th Ave N to 10th Ave N 8” PVC 1970 8” PVC Extension 4th St N 11th Ave N to 12th Ave N N/A N/A N/A None/No Sewer Alley b/w 9th Ave N & 10th Ave N 2nd St N to 4th St N 8” PVC 1970 Abandon Sewer Watermain All existing cast iron pipe (CIP) watermain along the Avenues in the neighborhood is proposed to be replaced with new ductile iron pipe (DIP). An 8-inch pipe is proposed on all the roadways to most cost effectively achieve adequate fire flows and water distribution. Fire Hydrants will also be replaced along the new watermain, and gate valves will be added at each intersection for more efficient operations and maintenance. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 15 The only east-west street with existing watermain is 3rd St N from 11th Ave N to 13th Ave N. This watermain has no confirmed services and is not necessary to achieve adequate fire flows and water distribution in the area. Due to the redundancy of this watermain, and to avoid additional costs from excavation and full street reconstruction on these two blocks of 3rd St N, it is recommended that this watermain along 3rd St N is abandoned in place with grout or sand material. The City’s standard flushing and sampling station would be installed at the dead-end of 13th Ave N to ensure water quality in the system. Per City policy all water service lines to single family homes are proposed to be replaced to the right-of-way with a new 1” diameter copper service line. A new curb stop valve and box will be provided on each service, approximately on the right-of-way line. Multi-family residential properties and commercial properties will receive a new 6” service line or a service line matching their existing service diameter, whichever is greater. The proposed watermain mainline improvements are summarized in Table 4 below and shown on Figure 4 in Appendix A. The exact age of the existing pipes listed in Table 4 could not be verified. Ages were reasonably estimated based on the existing pipe material and the known age of other utilities in the area. Table 4: Proposed Watermain Improvements Roadway From/To Existing Pipe Proposed Improvements Dia. Matl. Age 9th Ave N 1st St N to 3rd St N 6” CIP 1950 8” DIP 10th Ave N 1st St N to 4th St N 6” CIP 1950 8” DIP 11th Ave N 1st St N to Minnetonka Mills Rd 6” CIP 1950 8” DIP 12th Ave N 1st St N to Highway 7 6” CIP 1950 8” DIP 13th Ave N Dead-End to South Service Dr 6” CIP 1950 8” DIP 2nd St N 8th Ave N to 12th Ave N N/A N/A N/A None/No Watermain 3rd St N 9th Ave N to 11th Ave N N/A N/A N/A None/No Watermain 3rd St N 11th Ave N to 13th Ave N 6” CIP 1950 Abandon Watermain 3rd St N 13th Ave N to 15th Ave N N/A N/A N/A None/No Watermain 4th St N 9th Ave N to 10th Ave N N/A N/A N/A None/No Watermain 4th St N 11th Ave N to 12th Ave N N/A N/A N/A None/No Watermain Pedestrian Facilities Replacement of existing concrete sidewalks is proposed on all Avenues to be fully reconstructed. This will be necessary due to the proposed street and utility construction and because the existing sidewalks are in poor condition and/or do not drain properly. The sidewalks are proposed to be constructed at 6 feet width, and the proposed turf boulevard width will vary but will be somewhat consistent and generally wider than existing since most roadways are being narrowed. The preliminary proposed typical sidewalk section consists of 4” concrete, 4” aggregate base class 5, and spot subgrade soil corrections. The existing concrete sidewalk on 13th Ave N from 4th St N to South Service Dr will need to be removed due to the proposed street and utility construction. However, the sidewalk on both sides of this block does not connect to any existing pedestrian facilities to the north, south, east, or west. Due to the lack of existing pedestrian connectivity and lower pedestrian use, it could be considered to not replace this sidewalk and instead replace the area with additional turf (sod). Not replacing the sidewalk would be a cost saving measure if desired by Council and the residents/property owners on this block. Prepared by: Bolton & Menk, Inc. Proposed Improvements Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 16 There are no sidewalks along 13th Ave N south of 4th St N, and it would not be proposed to add sidewalks along these blocks unless desired by Council and the residents/property owners due to the lack of other pedestrian facilities to connect to in the area and the relatively lower pedestrian use with 13th Ave N being a dead-end to the south of 3rd St N. Spot sidewalk replacements are proposed along 2nd St N and 4th St N as determined by the engineer in the field for areas with poor drainage, cracked sidewalk, or settled sidewalk which could become a tripping hazard. There are no sidewalks along 3rd St N, and it would not be proposed to add sidewalks along these blocks unless desired by Council and the residents/property owners. There are no existing sidewalks along 3rd St to the east of the proposed street improvements (9th Ave N) or to the west of the proposed street improvements (15th Ave N), and there are existing east-west sidewalks along 1st St N, 2nd St N, 4th St N, and Minnetonka Mills Rd. There is also neighborhood access to the Lake Minnetonka Regional Trail at the intersection of 3rd St N & 15th Ave N and every other Avenue within the neighborhood. The proposed improvements to pedestrian facilities are shown on Figure 5 in Appendix A. Boulevard Trees As with all street and utility improvements being considered by the City of Hopkins, it is a goal of Staff and the project team to protect healthy boulevard trees and/or make improvements to the urban tree canopy where feasible. Design and construction of improvements, including appropriate selection of street widths and utility main placement, are proposed to be completed in a manner to achieve the City’s goals to save healthy trees. An evaluation of boulevard tree species and condition throughout the neighborhood will be completed with City Staff in consideration of the adjacent street and utility improvements to facilitate design and construction and meet these criteria. Due to their susceptibility to the emerald ash borer, green ash trees are generally considered undesirable trees. Similarly, silver maple trees are more susceptible to storm damage than other species, create more litter because of their soft wood and weak, brittle branches, and thus are not desirable trees to Public Works staff and local residents. Silver maples are also known to have an intrusive root system that can damage sidewalks and curbs and penetrate sewer joints. Finally, American Elm are still susceptible to Dutch Elm disease. These three undesirable species, as well as other trees that are either dead or in poor health, should either be removed or otherwise not protected through the design/construction process. An inventory of the trees located in the right of way would be performed during the preliminary design process by City public works staff and the project design and construction team. Consistent with all City of Hopkins annual street and utility improvement projects, trees that are dead or in very poor condition, and “undesirable” species in fair or poor condition, would be proposed for removal and replacement. Trees may be identified for removal due to conflicts with utilities or street grading and will be further evaluated during preliminary and final design to see if reasonable measures can be taken to preserve them. Options to preserve highly desirable trees in harm’s way include small retaining walls or moving service lines around trees but these practices are not always feasible. Unfortunately, there is always the possibility that additional trees will need to be removed and replaced during the construction process that were not planned for removal during design due to various unforeseen circumstances. The project team and field representatives would communicate and coordinate tree replacement with the property owner for each of these occurrences. Prepared by: Bolton & Menk, Inc. Estimated Costs and Funding Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 17 This project provides an opportunity to increase the health of the neighborhood forest by replacing some of the undesirable species with trees better suited for boulevard areas. One tree is proposed to be installed per each tree removed. New 2-inch balled and burlapped trees are typically planted in replacement of those removed. The City will communicate with the property owners to replace trees as part of the project in the event tree removal is necessary. The species of trees to be planted will be a wide variety and coordinated with the City’s public works staff. Properties located adjacent to boulevard tree removals will be contacted and allowed to provide input on their desire for a particular tree species to be planted based on the list provided. VI. Estimated Costs and Funding Estimated construction costs presented in this report are based on anticipated 2025 unit bid prices and include a 20 percent contingency factor. Overhead costs, estimated at 20 percent, include legal, engineering, administrative and fiscal costs. Final costs and any assessments would be determined by using low-bid construction costs of the proposed work. Proposed construction costs for the Central Avenues Phase 2 improvements (including curb and gutter, bituminous street, pedestrian facilities, storm sewer, sanitary sewer, water main, and turf restoration) are itemized in Appendix B and are summarized in Table 5 below. These cost estimates are based upon public construction cost information. Because the consultant has no control over the cost of labor, materials, competitive bidding process, weather conditions and other factors affecting the cost of construction, all cost estimates are opinions for general information of the client and no warranty or guarantee as to the accuracy of construction cost estimates is made. It is recommended that costs for project financing should be based upon actual, competitive bid prices with reasonable contingencies. Table 5: Estimated Cost of Proposed Central Avenues Phase 2 Improvements Proposed Street Improvements $5,013,000 Proposed Pedestrian Facility Improvements $1,440,000 Proposed Sanitary Sewer Improvements $2,356,000 Proposed Watermain Improvements $2,785,000 Proposed Storm Sewer Improvements $2,062,000 Construction Cost Subtotal $13,656,000 Construction Cost with Contingencies (20%) $16,387,000 Engineering & Administration (20%) $3,277,000 Total Estimated Project Costs $19,664,000 Prepared by: Bolton & Menk, Inc. Estimated Costs and Funding Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 18 The improvements would be funded using the following sources: PIR (BONDS, GENERAL TAX LEVY) $ 7,549,906 SPECIAL ASSESSMENTS $ 2,521,743 WATER FUND $ 3,586,746 SANITARY SEWER FUND $ 3,037,077 STORM SEWER FUND $ 2,968,744 Total $ 19,664,216 Special assessment funding was estimated using the 2025 cap amount per front foot of each parcel and multiplying it by the sum of the parcel lengths along all Avenues to be reconstructed. The 2025 cap amount for residential properties was determined to be $109.32 per front foot by adding 3% to the 2024 assessment cap according to City policy. There is no cap amount for commercial properties but there is only one commercial property in the neighborhood, which an estimated additional $22,500 was accounted for in the assessment funds. Assessments for side street assessments are calculated on a unit basis for each parcel one block to the north and south of the reconstructed street, but this does not apply to parcels already hitting the cap amount for reconstruction on the Avenues. It was assumed that there would be minimal to zero assessments from side street reconstruction in this neighborhood due to the configuration of streets proposed for reconstruction. There are no assessments for maintenance work, including milling or reclaiming and street resurfacing, per City policy. There are no assessments for storm sewer mains, sanitary sewer mains, or watermain improvements, but there are assessments for utility service lines owned by the property owner for sewer and water. Per City policy, each residential property owner receiving a new utility service from the main to the property line as part of the improvements is assessed for 50% of the actual costs. These costs were estimated using unit prices for each item of work to construct the service and divided in half for the property owner’s share. The City would pay the remaining 50% of the costs through their water and sanitary sewer funds. PIR (BONDS, GENERAL TAX LEVY), $7,549,906 , 38% SPECIAL ASSESSMENTS, $2,521,743 , 13% WATER FUND, $3,586,746 , 18% SANITARY SEWER FUND, $3,037,077 , 16% STORM SEWER FUND, $2,968,744 , 15% FUNDING SOURCES Prepared by: Bolton & Menk, Inc. Right-of-Way/Easements/Permits Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 19 A preliminary assessment roll is not included in this report but would be included in a feasibility report if ordered by Council. Potential outside funding opportunities include MPCA grants for Stormwater Resilience Planning and Stormwater Resilience Implementation, both expected to be available for applications in Fall 2024. The City could consider applying for one or both grants to assist in funding some of the costs for planning and construction of the storm sewer improvements that will improve flood resiliency throughout the neighborhood. Available funds from the MPCA are expected to be about $750,000 for the planning grant and about $35,000,000 for the implementation grant to be awarded to approved applications throughout the State. VII. Right-of-Way/Easements/Permits The majority of the proposed improvements would be limited to the existing street ROW along all corridors. Temporary construction easements may be needed for work outside the street ROW such as driveway apron replacement, grading and turf restoration, but is not anticipated. It is also not anticipated that any permanent easements would be required for the proposed improvements. Therefore, there are no anticipated costs for easement acquisition. Permits would be required from the Minnesota Pollution Control Agency for grading (National Pollutant Discharge Elimination System permit), Minnesota Department of Health for Water Main Replacement, and the Nine Mile Creek Watershed District for Erosion Control and Stormwater Management. VIII. Project Phasing The Central Avenues Phase 2 improvements area includes too much work to be constructed during one construction season. Therefore, the proposed improvements need to be split into separate phases and constructed over multiple years. Construction sequencing and scope of work were considered when evaluating different project phasing options, and three phasing options were considered for the proposed improvements. Phasing Option A, shown on Figure 6 in Appendix A, divides the streets to be reconstructed or resurfaced into two equally sized phases to be constructed over two years. This option could be constructed under two separate construction contracts (one phase/project for each year) or one construction contract/project to be constructed over two years. There are several benefits to one construction contract versus two including one Contractor to complete all the work resulting in fewer chances for overlap of work and conflicts, one plan and specifications resulting more efficient engineering, and larger quantities of work which typically equates to cheaper unit prices and an ultimate cost savings. It was considered to delay the project by one year to start two years/phases in 2026, but this is not recommended due to anticipated inflation in construction costs, additional street maintenance costs to patch potholes and cracks, and increased risk of underground utility failure of the sanitary sewer or watermain. Phasing Option B, shown on Figure 7 in Appendix A, divides the streets to be reconstructed or resurfaced into two unequally sized phases to be constructed over three years. This option could be constructed under two separate construction contracts (one smaller one-year phase/project and one larger two-year phase/project) or three separate construction contracts (one smaller one- year phase/project and two medium sized one-year phases/projects). This option was evaluated to provide the City with an option for a more budget friendly project in 2025 before completing a larger project(s) in 2026 and 2027. However, while there would be cost savings in 2025, costs would increase in 2026 and 2027 due to inflation, additional contracts, and larger quantities of Prepared by: Bolton & Menk, Inc. Conclusion and Recommendations Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 20 work that are pushed back by at least one year, making this less desirable than Option A. Phasing Option C, shown on Figure 8 in Appendix A, divides the streets to be reconstructed or resurfaced into three equally sized phases to be constructed over three years. This option could be constructed under three separate construction contracts (one phase/project for each year) or one construction contract/project to be constructed over three years. This option is similar to Option A but would spread the costs out over three years instead of two years. While the cost per year would be lower, the total cost would be anticipated to be higher due to inflation of construction costs and more risks with either splitting this up into three sperate projects or constructing one project over three years. Three separate projects could cause complications and additional overlap of efforts at the project limits. One project over three years is a risk to the Contractor when bidding due to the unknowns of material and labor costs two to three years out, resulting in Contractors inflating their bid to compensate for these unknown cost increases regardless of the quantity of work. There is also no reason from a constructability standpoint to split the improvements into three phases/years when the improvements can feasibly be constructed in two phases/years, making this option less desirable than Option A The estimated costs for the proposed improvements were evaluated for each phasing option and each contract/project scenario (one, two, or three contracts/projects). It was determined that the phasing option did not affect the total cost of the improvements as much as the number of contracts/projects did. The fewer contracts/projects, the lower total costs for the proposed improvements. One contract/project is anticipated to be about $1 million and up to $2.5 million cheaper in total project costs than three separate contracts/projects for the same improvements throughout the Central Avenues Neighborhood. One construction contract for a two-year project (Phasing Option A) is recommended with construction starting in Spring 2025 and concluding in Fall 2026. Construction in 2025 would be completed in Fall 2025, work would be suspended during the winter of 2025 to 2026, and construction would begin again in Spring 2026 to be completed later that year. IX. Conclusion and Recommendations From an engineering standpoint, these improvements are feasible, cost effective, and necessary and can best be accomplished by letting competitive bids for the work. It is recommended that a feasibility report is ordered for a project to start the Minnesota Statutes Chapter 429 assessment process since special assessments would be proposed for the streets to be fully reconstructed. A feasibility report should be ordered and completed in Fall 2024 if it is desired to order final plans and specifications for contractors to bid and start construction on the proposed improvements in 2025. It is also recommended that the work be done under one contract, for all street and utility improvements described in this report, to complete the work in an orderly and efficient manner over two construction seasons. This is anticipated to provide the City with the best quality product at the lowest cost, but the City, its financial consultant, and any persons assessed will have to determine the economic feasibility of the proposed improvements. Prepared by: Bolton & Menk, Inc. Project Schedule Central Avenues Phase 2 ǀ BMI 24X.134763.000 Page 21 X. Project Schedule If a Feasibility Report is ordered by the City Council for a project to start construction in 2025, the following tentative schedule is proposed: Present Project Scoping Report and Staff Recommendations / Order Feasibility Report ............................................................... September 3, 2024 Mail Questionnaires & Neighborhood Meeting Invites ....................... September 4 – 6, 2024 Neighborhood Meeting 1 .............................................................................. October 2, 2024 Council Set Public Hearing Date / Present Feasibility Report ..................... October 15, 2024 Neighborhood Meeting 2 .......................................................................... November 6, 2024 Present Feasibility Report / Conduct Public Hearing / Order Final Plans/Specifications ................................................. November 12, 2024 Approve Final Plans & Specifications / Authorize Advertisement for Bids ........................ Late January/Early February 2025 Bid Opening ......................................................................... Late February/Early March 2025 Council Sets Public Assessment Hearing Date ..................................................... March 2025 Neighborhood Meeting 3 ............................................................ Late March/Early April 2025 Council Accepts Bids / Conduct Public Assessment Hearing / Adopt Assessment Roll / Award Bid ...........................................................April 2025 Start of Construction ............................................................................................... May 2025 Appendix A: Figures 35' F-F 28' F-F 36' F-F 28' F-F 32' F-F 28' F-F 36' F-F 36' F-F 36' F-F 28' F-F 36' F-F36' F-F36' F-F36' F-F36' F-F36' F-F30' F-F30' F-F30' F-F30' F-F35' F-F 28' F-F 32' F-F 28' F-F 31' F-F 28' F-F30' F-F30' F-F36' F-F36' F-F36' F-F36' F-F36' F-F36' F-F35' F-F 28' F-F 36' F-F 28' F-F 36' F-F 36' F-F 36' F-F 28' F-F 36' F-F 28' F-F 36' F-F 36' F-F 36' F-F 36' F-F 30' F-F30' F-F30' F-F28' F-F30' F-F28' F-F36' F-F 28' F-F H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_LAYOUT1_.dwg 8/20/2024 10:56:05 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 1: PROJECT SCOPE & STREET WIDTHSAUGUST 2024LEGENDPROPOSED RECONSTRUCTIONPROPOSED STREET RESURFACINGEXISTING STREET WIDTH(FACE OF CURB TO FACE OF CURB)PROPOSED STREET WIDTH(FACE OF CURB TO FACE OF CURB)12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETXX' F-FXX' F-FMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NRFEETSCALE0125250HORZ. H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_STORM_.dwg 8/20/2024 10:56:07 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 2: STORM SEWERAUGUST 2024LEGEND12TH AVE N MINNETONKA MILLS RDHWY 7RFEETSCALE0125250HORZ.1ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE NMAINSTREET MAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NLARGE STORM SEWER (27" - 36")MEDIUM STORM SEWER (18" - 24")SMALL STORM SEWER (12" - 15")EXISTING STORM SEWERREPLACE 24" PIPEEXTEND 15" PIPEREPLACE 12" PIPE WITH 15" PIPEPROPOSED STORM SEWEREXISTING CATCH BASIN INLETSPROPOSED CATCH BASIN INLETS42" STORM SEWER42" STORM SEWER60" STORM SEWER60" STORM SEWER8" STORM SEWER60" STORM SEWERTRUNK STORM SEWER (42"+)POTENTIAL STORMWATER MANAGEMENTUNDERGROUND CHAMBERSPOTENTIAL STORMWATERMANAGEMENT INFILTRATION PIPE H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_SANITARY_.dwg 8/20/2024 10:56:09 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 3: SANITARY SEWERAUGUST 2024RLEGENDEXISTING 8" VCP SANITARY SEWER(REPLACE WITH 8" PVC AND NEW SERVICES)EXISTING 8" VCP SANITARY SEWER(CIPP LINING)EXISTING 8" PVC SANITARY SEWER(REPLACE & RELOCATE WITH 8" PVC)EXISTING 8" PVC SANITARY SEWER(ABANDON IN PLACE)12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NFEETSCALE0125250HORZ.(CIPP LINING AND LATERAL LINING)EXISTING 15" VCP SANITARY SEWER(CIPP LINING)EXISTING 12" VCP SANITARY SEWER(REPLACE WITH 12" PVC AND NEW SERVICES)EXISTING 12" VCP SANITARY SEWER(CIPP LINING)EXISTING 10" VCP SANITARY SEWER(REPLACE WITH 10" PVC AND NEW SERVICES)EXISTING 8" VCP SANITARY SEWER H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_WATERMAIN_.dwg 8/20/2024 10:56:11 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 4: WATERMAINAUGUST 2024LEGENDEXISTING 6" CIP WATERMAINREPLACE WITH 8" DIP & NEW SERVICESABANDON EXISTING 6"CIP WATERMAINEXISTING 6" CIP WATERMAINEXISTING 8" DIP/HDPE WATERMAINEXISTING 12" DIP/HDPE WATERMAINEXISTING 16" TRUNK WATERMAIN12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NRFEETSCALE0125250HORZ.8" CIPINSTALL FLUSHING ANDSAMPLING STATION H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_SIDEWALK_.dwg 8/20/2024 10:56:13 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 5: PEDESTRIAN FACILITIESAUGUST 2024LEGEND12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NLAKE MINNETONKAREGIONAL TRAILRFEETSCALE0125250HORZ.LAKE MINNETONKA REGIONAL TRAILSPOT SIDEWALK REPAIRSOF PROJECT AREAEXISTING SIDEWALK OUTSIDE(COST SAVING MEASURE)OPTION TO NOT REPLACE SIDEWALKPROPOSED SIDEWALK REPLACEMENT H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_LAYOUT2_.dwg 8/20/2024 10:56:14 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 6: PROJECT PHASING OPTION AAUGUST 2024LEGEND2025 RECONSTRUCTION2025 STREET RESURFACING2026 RECONSTRUCTION2026 STREET RESURFACING12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NRFEETSCALE0125250HORZ. H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_LAYOUT3_.dwg 8/20/2024 10:56:16 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 7: PROJECT PHASING OPTION BAUGUST 2024LEGEND2025 RECONSTRUCTION2025 STREET RESURFACING2026/2027 RECONSTRUCTION2026/2027 STREET RESURFACING12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NRFEETSCALE0125250HORZ. H:\HOPK\24X134763000\2_Preliminary\B_Layouts\134763_C_LAYOUT4_.dwg 8/20/2024 10:56:18 AM RCENTRAL AVENUES IMPROVEMENTS PHASE 2CITY OF HOPKINSFIGURE 8: PROJECT PHASING OPTION CAUGUST 2024LEGEND2025 RECONSTRUCTION2025 STREET RESURFACING2026 RECONSTRUCTION2027 RECONSTRUCTION2027 STREET RESURFACING12TH AVE N MINNETONKA MILLS RDHWY 71ST ST N11TH AVE N 10TH AVE N 9TH AVE N 8TH AVE N 14TH AVE N 15TH AVE N 1ST ST N13TH AVE N 12TH AVE N 11TH AVE N 10TH AVE N 9TH AVE N 14TH AVE N 15TH AVE N MAINSTREETMAINSTREETMAETZOLD FIELD4TH ST NSOUTH SERVICE DR3RD ST N2ND ST NRFEETSCALE0125250HORZ. Appendix B: Preliminary Cost Estimates PRELIMINARY ENGINEER'S ESTIMATECENTRAL AVENUES PHASE 2ESTIMATED UNIT PRICES FOR 2025 CONSTRUCTIONCITY OF HOPKINS, MN1MOBILIZATIONLUMP SUM$750,000.000.100.400.200.100.20$75,000.00$300,000.00$150,000.00$75,000.00$150,000.001.00$750,000.002CLEARINGTREE$450.00161$72,450.00161$72,450.003GRUBBINGTREE$250.00161$40,250.00161$40,250.004DECIDUOUS TREE 2" CAL B&BEACH$550.00161$88,550.00161$88,550.005REMOVE SIGN POSTEACH$75.00200$15,000.00200$15,000.006REMOVE SIGN PANELEACH$50.00200$10,000.00200$10,000.007REMOVE CURB AND GUTTERLIN FT$5.0020700$103,500.0020700$103,500.008REMOVE CURB AND GUTTER (SPOT)LIN FT$10.001183$11,830.001183$11,830.009REMOVE BITUMINOUS DRIVEWAY PAVEMENTSQ YD$9.00520$4,680.00520$4,680.0010REMOVE BITUMINOUS STREET PAVEMENTSQ YD$4.5036945$166,252.5036945$166,252.5011REMOVE CONCRETE WALKSQ FT$1.25105630$132,037.50105630$132,037.5012REMOVE CONCRETE WALK (SPOT)SQ FT$3.001765$5,295.001765$5,295.0013REMOVE CONCRETE STEPEACH$110.00360$39,600.00360$39,600.0014REMOVE CONCRETE ALLEY/DRIVEWAY PAVEMENTSQ YD$12.002795$33,540.002795$33,540.0015SALVAGE & REINSTALL SIGN PANELEACH$225.0040$9,000.0040$9,000.0016SALVAGE & REINSTALL PAVERSSQ FT$25.00120$3,000.00120$3,000.0017REMOVE RAILINGLIN FT$35.00240$8,400.00240$8,400.0018SAWING CONCRETE PAVEMENT (FULL DEPTH)LIN FT$5.501007$5,538.501007$5,538.5019SAWING BITUMINOUS PAVEMENT (FULL DEPTH)LIN FT$3.501150$4,025.001150$4,025.0020SALVAGE & REINSTALL FENCELIN FT$120.00275$33,000.00275$33,000.0021REMOVE RETAINING WALLLIN FT$22.00950$20,900.00950$20,900.0022SALVAGE & REINSTALL BLOCK RETAINING WALLLIN FT$100.00150$15,000.00150$15,000.0023REMOVE HYDRANTEACH$500.0016$8,000.0016$8,000.0024REMOVE WATERMAINLIN FT$6.009860$59,160.009860$59,160.0025REMOVE DRAINAGE STRUCTURE (STORM)EACH$600.0063$37,800.0063$37,800.0026REMOVE STORM SEWER PIPELIN FT$16.002450$39,200.002450$39,200.0027REMOVE SANITARY SEWER PIPELIN FT$5.0010285$51,425.0010285$51,425.0028REMOVE SANITARY MANHOLEEACH$725.0032$23,200.0032$23,200.0029EXPLORATORY EXCAVATIONHOUR$1,000.00151515$15,000.00$15,000.00$15,000.0045$45,000.0030COMMON EXCAVATIONCU YD$30.0034656$1,039,680.0034656$1,039,680.0031SUBGRADE EXCAVATIONCU YD$30.001517$45,510.001517$45,510.0032RECLAIM BITUMINOUS SURFACE (IN PLACE)SQ YD$3.503585$12,547.503585$12,547.5033SUBGRADE PREPARATIONSQ YD$3.003585$10,755.003585$10,755.0034GEOTEXTILE FABRIC TYPE VSQ YD$2.0041576$83,152.0041576$83,152.0035STABILIZING AGGREGATECU YD$45.001395$62,775.001395$62,775.0036SELECT GRANULAR BORROW TON$18.0025269$454,842.0025269$454,842.0037CLASS 5 AGGREGATE BASETON$20.0017155$343,100.0017155$343,100.0038CLASS 2 AGGREGATE SURFACING (GRAVEL DRIVEWAY)TON$60.005$300.005$300.0039BITUMINOUS WEARING COURSE (SPWEA240C)TON$95.003714$352,830.003714$352,830.0040BITUMINOUS -NON-WEARING COURSE (SPNWB230C)TON$90.003203$288,270.003203$288,270.0041BITUMINOUS WEARING COURSE (SPWEA340C)TON$100.001034$103,400.001034$103,400.0042BITUMINOUS -NON-WEARING COURSE (SPNWB330C)TON$95.001553$147,535.001553$147,535.0043BITUMINOUS MATERIAL FOR TACK COATGAL$3.502297$8,039.502297$8,039.50442" BITUMINOUS STREET PATCHSQ YD$30.00633$18,990.00633$18,990.0045MILL BITUMINOUS SURFACE (2")SQ YD$3.254217$13,705.254217$13,705.25463" BITUMINOUS DRIVEWAYSQ YD$55.00520$28,600.00520$28,600.0047JOINT ADHESIVE (MASTIC)LIN FT$0.7520700$15,525.0020700$15,525.0048MODULAR BLOCK RETAINING WALLSQ FT$55.001500$82,500.001500$82,500.0049TIMBER RETAINING WALLLIN FT$120.00350$42,000.00350$42,000.00506" PERF PVC UNDERDRAINLIN FT$22.505179$116,527.505179$116,527.50516" PERF PVC UNDERDRAIN CLEANOUTEACH$375.0076$28,500.0076$28,500.005215" RC STORM PIPELIN FT$72.003075$221,400.003075$221,400.005324" RC STORM PIPELIN FT$110.00250$27,500.00250$27,500.0054STORM MANHOLE (48-4020)EACH$3,000.006$18,000.006$18,000.0055STORM MANHOLE (60-4020)EACH$6,000.002$12,000.002$12,000.0056STORM MANHOLE (72-4020)EACH$8,000.001$8,000.001$8,000.0057STORM MANHOLE (84-4022)EACH$10,000.001$10,000.001$10,000.0058STORM CATCH BASINEACH$2,250.0060$135,000.0060$135,000.0059SAFL BAFFLESQ FT$530.0030$15,900.0030$15,900.0060INSTALL CASTING (R-3067)(STORM)EACH$1,000.0055$55,000.0055$55,000.0061INSTALL CASTING (R-3067-C)(STORM)EACH$1,050.005$5,250.005$5,250.00ITEM NO. ITEM UNIT UNIT PRICEESTIMATED QUANTITIESSANITARY TOTAL STORM TOTAL WATER TOTAL STREET TOTALTOTAL COSTESTIMATED COSTSTOTAL QUANTITYWATER TOTALSTORM TOTALSIDEWALK TOTAL SANITARY TOTALSIDEWALK TOTAL STREET TOTAL8/20/2024Page 1 of 3 PRELIMINARY ENGINEER'S ESTIMATECENTRAL AVENUES PHASE 2ESTIMATED UNIT PRICES FOR 2025 CONSTRUCTIONCITY OF HOPKINS, MNITEM NO. ITEM UNIT UNIT PRICEESTIMATED QUANTITIESSANITARY TOTAL STORM TOTAL WATER TOTAL STREET TOTALTOTAL COSTESTIMATED COSTSTOTAL QUANTITYWATER TOTALSTORM TOTALSIDEWALK TOTAL SANITARY TOTALSIDEWALK TOTAL STREET TOTAL62INSTALL CASTING (R-1733)(STORM)EACH$1,200.008$9,600.008$9,600.0063INSTALL CASTING (R-1733 - SLOTTED GRATE)(STORM)EACH$1,250.002$2,500.002$2,500.0064ADJUST FRAME & RING CASTINGS (STORM)EACH$875.0014$12,250.0014$12,250.0065CONNECT TO EXISTING STORM PIPEEACH$1,600.0020$32,000.0020$32,000.0066CONNECT TO EXISTING STORM STRUCTUREEACH$2,100.0027$56,700.0027$56,700.0067STORMWATER MANAGEMENT - PERFORATED PIPESLIN FT$350.00200$70,000.00200$70,000.0068STORMWATER MANAGEMENT - UNDERGROUND CHAMBERSLUMP SUM$325,000.001$325,000.001$325,000.0069STORMWATER MANAGEMENT - PARKING LOTLUMP SUM$275,000.001$275,000.001$275,000.00708" PVC SDR 35 SANITARY SEWER PIPELIN FT$65.007075$459,875.007075$459,875.007110" PVC SDR 35 SANITARY SEWER PIPELIN FT$75.001305$97,875.001305$97,875.007212" PVC SDR 35 SANITARY SEWER PIPELIN FT$85.00650$55,250.00650$55,250.0073 COARSE AGGREGATE BEDDING (TYPE B) LIN FT $10.00775$7,750.00 775$7,750.00748" CIPP LINING LIN FT$55.001195$65,725.001195$65,725.007510" CIPP LINING LIN FT$65.00675$43,875.00675$43,875.007612" CIPP LINING LIN FT$75.00320$24,000.00320$24,000.007715" CIPP LININGLIN FT$90.00650$58,500.00650$58,500.0078CIPP LATERAL LININGLIN FT$25.00216$5,400.00216$5,400.0079CIPP TAP LINEREACH$5,000.0018$90,000.0018$90,000.0080SEAL SANITARY MANHOLEEACH$4,500.009$40,500.009$40,500.0081TRIM PROTRUDING TAPEACH$550.004$2,200.004$2,200.00826" PVC SDR 26 SANITARY SEWER SERVICE PIPELIN FT$45.009372$421,740.009372$421,740.00838" X 6" SDR 26 PVC SERVICE WYEEACH$675.00203$137,025.00203$137,025.008410" X 6" SDR 26 PVC SERVICE WYEEACH$750.0041$30,750.0041$30,750.008512" X 6" SDR 26 PVC SERVICE WYEEACH$850.0022$18,700.0022$18,700.0086INSTALL CASTING (R-1733)(SANITARY)EACH$1,250.0039$48,750.0039$48,750.0087SANITARY MANHOLEEACH$6,000.0035$210,000.0035$210,000.0088RECONNECT SANITARY SEWER SERVICEEACH$450.00284$127,800.00284$127,800.0089SANITARY SERVICE REPAIREACH$3,000.0012$36,000.0012$36,000.0090CONNECT TO EXISTING SANITARY SEWER PIPEEACH$3,500.0010$35,000.0010$35,000.0091CONNECT TO EXISTING SANITARY MANHOLEEACH$4,500.0011$49,500.0011$49,500.0092HYDRANTEACH$7,500.0016$120,000.0016$120,000.0093DUCTILE IRON FITTINGSPOUND$15.004950$74,250.004950$74,250.00946" GATE VALVE & BOXEACH$2,750.0017$46,750.0017$46,750.00958" GATE VALVE & BOXEACH$3,750.0080$300,000.0080$300,000.00966" DIP WATERMAINLIN FT$80.00240$19,200.00240$19,200.00978" DIP WATERMAINLIN FT$85.009280$788,800.009280$788,800.00981" TYPE K COPPER SERVICE PIPELIN FT$45.009372$421,740.009372$421,740.00991" CURB STOP & BOXEACH$650.00284$184,600.00284$184,600.001001" CORPORATION STOPEACH$425.00284$120,700.00284$120,700.00101INSTALL FLUSHING STATIONEACH$5,000.001$5,000.001$5,000.00102INSTALL SAMPLING STATIONEACH$5,000.001$5,000.001$5,000.00103GROUNDING ANODEEACH$150.00309$46,350.00309$46,350.00104TRACER WIRE ACCESS BOX (NON ROADWAY)EACH$150.00284$42,600.00284$42,600.00105TRACER WIRE TEST STATION (HYDRANT)EACH$175.0016$2,800.0016$2,800.00106HYDRANT EXTENSIONLIN FT$1,800.006$10,800.006$10,800.00107RECONNECT WATER SERVICEEACH$425.00284$120,700.00284$120,700.00108CONNECT TO EXISTING WATERMAINEACH$2,500.009$22,500.009$22,500.001094" POLYSTYRENE INSULATIONSQ YD$50.00320$16,000.00320$16,000.00110FORD TYPE A-1 CURB BOX COVEREACH$300.0044$13,200.0044$13,200.00111TEMPORARY WATER SERVICEEACH$500.00284$142,000.00284$142,000.001124" CONCRETE WALKSQ FT$7.25105630$765,817.50105630$765,817.501134" CONCRETE WALK (SPOT)SQ FT$10.501765$18,532.501765$18,532.50114CONCRETE STEPEACH$320.00360$115,200.00360$115,200.00115CONCRETE CURB & GUTTER DESIGN B618LIN FT$20.0020700$414,000.0020700$414,000.00116CONCRETE CURB & GUTTER DESIGN B618 (SPOT)LIN FT$37.501183$44,362.501183$44,362.501176" CONCRETE WALKS (PED RAMPS)SQ YD$140.00790$110,600.00790$110,600.001186" CONCRETE DRIVEWAYSQ YD$90.001370$123,300.001370$123,300.001198" CONCRETE DRIVEWAY/ALLEYSQ YD$115.001275$146,625.001275$146,625.00120TRUNCATED DOMESSQ FT$60.00309$18,540.00309$18,540.00121TRAFFIC CONTROL LUMP SUM$100,000.000.100.400.200.100.20$10,000.00$40,000.00$20,000.00$10,000.00$20,000.001.00$100,000.00122SIGN POST U CHANNELEACH$160.00180$28,800.00180$28,800.008/20/2024Page 2 of 3 PRELIMINARY ENGINEER'S ESTIMATECENTRAL AVENUES PHASE 2ESTIMATED UNIT PRICES FOR 2025 CONSTRUCTIONCITY OF HOPKINS, MNITEM NO. ITEM UNIT UNIT PRICEESTIMATED QUANTITIESSANITARY TOTAL STORM TOTAL WATER TOTAL STREET TOTALTOTAL COSTESTIMATED COSTSTOTAL QUANTITYWATER TOTALSTORM TOTALSIDEWALK TOTAL SANITARY TOTALSIDEWALK TOTAL STREET TOTAL123SIGN POST W/ FOUNDATIONEACH$450.0020$9,000.0020$9,000.00124SIGN PANELS TYPE CSQ FT$35.00160$5,600.00160$5,600.00125SIGN PANELS TYPE DSQ FT$45.0040$1,800.0040$1,800.00126STREET SWEEPER WITH OPERATORHOUR$175.00120$21,000.00120$21,000.00127STABILIZED CONSTRUCTION EXITEACH$2,000.008$16,000.008$16,000.00128STORM DRAIN INLET PROTECTIONEACH$250.0078$19,500.0078$19,500.00129TOPSOIL BORROW (SPECIAL)CU YD$40.004340$173,600.004340$173,600.00130HYDROSEEDINGSQ YD$4.00405$1,620.00405$1,620.00131SODDING, TYPE LAWNSQ YD$11.0024919$274,109.0024919$274,109.00132SILT FENCELIN FT$4.50987$4,441.50987$4,441.50133BIOROLLLIN FT$4.00498$1,992.00498$1,992.00134FABRICATED RAILINGLIN FT$300.00240$72,000.00240$72,000.00135LANDSCAPE ALLOWANCELUMP SUM$150,000.000.100.400.200.100.20$15,000.00$60,000.00$30,000.00$15,000.00$30,000.001.00$150,000.001364" SKIP YELLOW STRIPING - MULTI COMPONENT LIQUIDLIN FT$1.50699$1,048.50699$1,048.5013724" SOLID WHITE STOP BAR - THERMOPLASTICLIN FT$27.5058$1,595.0058$1,595.00138CROSSWALK WHITE - THERMOPLASTICSQ FT$13.501600$21,600.001600$21,600.001,439,633.50$ 5,013,454.75$ 2,355,840.00$ 2,061,627.50$ 2,785,150.00$ $13,655,705.75287,926.70$ 1,002,690.95$ 471,168.00$ 412,325.50$ 557,030.00$ 2,731,141.15$ 345,512.04$ 1,203,229.14$ 565,401.60$ 494,790.60$ 668,436.00$ 3,277,369.38$ 2,073,072.24$ 7,219,374.84$ 3,392,409.60$ 2,968,743.60$ 4,010,616.00$ 19,664,216.28$ TOTAL ESTIMATED PROJECT COSTCONTINGENCIES (20%)ENGINEERING AND ADMINISTRATION (20%)SUBTOTAL8/20/2024Page 3 of 3