Loading...
Staff Report CC Page 1 of 21 Project: Chanhassen Civic Campus (#2024-02) Planning Commission Review Date: March 19, 2024 City Council Review Date: April 15, 2024 Drafted By: Eric Maass, Planning Director Rachel Arsenault, Associate Planner Rachel Jeske, Planner Erik Henricksen, Project Engineer Joe Seidl, Water Resources Engineer Staff Report Date: March 26, 2024 SUMMARY OF REQUEST: The applicant is requesting approval for the preliminary plat, site plan review, and rezoning from Office and Institutional to Planned Unit Development. This project will encompass the existing Chanhassen Public Library, city hall, parking ramp, fire station, and skate park. The development is proposing two development phases; the first phase includes the construction of the new city hall and senior center as well as the associated parking, and the second phase will include the demolition of the old city hall and the construction of the new park pavilion and its associated amenities. STAFF RECOMMENDATION: Staff recommends approval of the requested preliminary plat, site plan, and rezoning for the construction of the project as proposed subject to updating of plans based on staff review comments. OWNER: City of Chanhassen PO BOX 147 CHANHASSEN, MN 55317 LOCATION: 7610 Laredo Drive, 7700 Market Boulevard, and 7711 Kerber Boulevard. Schneider Park Second Addition, Block 1, Lot 2. Schneider Park Second PROPOSED MOTION: “The City Council approves the proposed ordinance rezoning from Office Institutional to Planned Unit Development, preliminary plat and site plan for the construction of two government services buildings subject to the conditions with the staff report.” Page 2 of 21 Addition, Block 1, Lot 1. S 204.98’ of E 424.72’ of E 990’ of SW ¼ SW ¼. CURRENT ZONING: Office and Institutional (OI) 2040 LAND USE PLAN: Public/ Semi Public PROPOSED ZONING: Planned Unit Development (PUD) – Central Business District ACREAGE: 9.407 acres LEVEL OF CITY DISCRETION IN DECSISION-MAKING: The city’s discretion in approving or denying a preliminary plat is limited to whether the proposed plat meets the standards outlined in the subdivision regulations and zoning ordinance. If it meets these standards, the city must approve the preliminary plat. This is a quasi-judicial decision. The city’s discretion in approving or denying a site plan is limited to whether the proposed project complies with zoning ordinance requirements. If it meets these standards, the city must then approve the site plan. This is a quasi-judicial decision. The city has a relatively high level of discretion in approving or denying a rezoning to a PUD because the city is acting in its legislative or policy-making capacity. A PUD must be consistent with the city’s comprehensive plan. City Code requires that notice of the public hearing be mailed to all property owners within 500 feet (highlighted in blue). Page 3 of 21 APPLICABLE REGULATIONS: Chapter 18, Subdivisions Chapter 20, Article II, Division 6, Site Plan Review Chapter 20, Article VIII Planned Unit Development District Chapter 20, Article XVIII “CBD” Central Business District ZONING OVERVIEW Existing Zoning Designation The property is currently zoned Office and Institutional (OI). Offices, libraries, and public parks/open space are all permitted uses in the OI zoning district. Environmental Protection Districts Bluff Creek Corridor – This project is not encumbered by the Bluff Creek Overlay District. Bluff Protection - The proposed project is located outside of the required bluff setback. Floodplain Overlay - The proposed project is located outside of the floodplain. Shoreland Management - The property is outside of the Shoreland Protection District. Wetland Protection - There are no wetlands on the site. Proposed Rezoning The project is located adjacent to the Central Business District and is proposing using the Central Business District as the underlying zoning district for the PUD. Surrounding Zoning Properties to the north, across Santa Vera Drive, are zoned Mixed Low Density Residential. The properties to the northeast and northwest are zoned Residential Planned Unit Development. The properties to the east, across Laredo Drive are zoned Residential Single Family. The properties to the southeast and southwest are zoned Central Business District. The properties to the south, across West 78th Street, are zoned Planned Unit Development. Justification for Rezoning to PUD: The applicant is requesting to rezone approximately 9.4 acres from Office Institutional District, IO, to Planned Unit Development – Chanhassen Civic Campus. The project proposes the new construction of a 59,509 square foot City Hall building, a 1,599 square foot park pavilion, and a park area. The review criteria are taken from the intent section of the PUD Ordinance. Sec 20-501 Intent Planned unit developments offer enhanced flexibility to develop a site through the relaxation of most normal zoning district standards. The use of the PUD zoning also allows for a greater Page 4 of 21 variety of uses, internal transfers of density, construction phasing and a potential for lower development costs. In exchange for this enhanced flexibility, the city has the expectation that the development plan will result in a significantly higher quality and more sensitive proposal than would have been the case with the use of other, more standard zoning districts. It will be the applicant's responsibility to demonstrate that the city's expectation is to be realized as evaluated against the following criteria. Planned unit developments are to encourage the following: Preservation of desirable site characteristics and open space and protection of sensitive environmental features, including steep slopes, mature trees, creeks, wetlands, lakes and scenic views. More efficient and effective use of land, open space and public facilities through mixing of land uses and assembly and development of land in larger parcels. High quality of design and design compatible with surrounding land uses, including both existing and planned. Site planning, landscaping and building architecture should reflect higher quality design than is found elsewhere in the community. Sensitive development in transitional areas located between different land uses and along significant corridors within the city. Development which is consistent with the comprehensive plan. Parks and open space. The creation of public open space may be required by the city. Such park and open space shall be consistent with the comprehensive park plan and overall trail plan. Energy conservation through the use of more efficient building designs and sightings and the clustering of buildings and land uses. Use of traffic management and design techniques including the provision of transit and pedestrian linkages to reduce the potential for traffic conflicts. Improvements to area roads and intersections may be required as appropriate. Where appropriate, the use of transportation demand management strategies may be required within a project. Land Use – Zoning Consistency The following zoning districts are consistent with government services land use: Office Institutional, Central Business District, and Planned Unit Development – Central Business District, PUD. The city uses PUD zoning to create dedicated public spaces, in this case, the Chanhassen Civic Campus. The proposed rezoning to Planned Unit Development – Chanhassen Civic Campus is consistent with the comprehensive plan land use designation of Public/Semi-Public use. The proposed rezoning assists in the furtherance of the following land use goals of the City of Chanhassen Comprehensive Plan: Page 5 of 21 · The city must strive for a balance of development that will both meet the needs of the residents and assure the city’s financial health. · The city will support the development of neighborhood and local service centers where appropriate. These uses may be developed as a part of a mixed-use or Planned Unit Development (PUD). · Transitions should be created between incompatible land uses with increased setbacks and landscaping. DEVELOPMENT DESIGN STANDARDS Chanhassen Civic Campus a) Intent The purpose of this zone is to create a PUD for the Chanhassen Civic Campus. The use of the PUD zone is to allow for more flexible design standards while creating a higher quality and more sensitive proposal. The PUD requires that the development demonstrate a higher quality of architectural standards and site design that provides a direct benefit to the community. Except modified by the Chanhassen Civic Campus PUD ordinance, the development shall comply with the requirements of the Central Business District, CBD. b) Permitted Uses Shall comply with the permitted uses outlined in the proposed PUD ordinance. c) Lot Requirements and Setbacks The PUD ordinance requires setbacks from roadways and exterior property lines. The lot requirements and setbacks required are outlined in the proposed PUD ordinance. d) Building Materials and Design Building Materials shall align with the architectural plans prepared by BKV Group and dated 2/16/2024. e) Signage Shall comply with the signage requirements outlined in the proposed PUD ordinance. f) Landscaping Landscaping shall comply with the landscaping plan prepared by HKGi and dated 2/16/2024 with the required staff revisions and approved by city council. PRELIMINARY PLAT REVIEW The preliminary plat as shown would maintain the two out of the three lots, as divided in the Schneider Park Second Addition plat. PID 257740020, the existing library lot, is planned to be subdivided vertically to maintain one primary structure per lot when the new City Hall is Page 6 of 21 constructed on the corner of West 78th Street and Market Boulevard. Lot One will include the existing Chanhassen Public Library and structured parking. Lot Two will include the new City Hall and public parking lot. The new city hall will maintain its existing address of 7700 Market Boulevard. Lot Three will consist of the existing city hall and the new park pavilion, performance stage, skate park, pickleball courts, and a combination of new and existing surface parking. The park pavilion will be addressed off Kerber Boulevard. Lot Four will include the existing Chanhassen Fire Station and its associated surface parking. All existing drainage and utility easements will be vacated with the replatting. The proposed preliminary plat provides for the dedication of new drainage and utility easements commensurate to the amended property lines and utility plans that will service the proposed buildings on site. The underlying zoning district of the Planned Unit Development, the Central Business District, does not have restrictions for the minimum lot area, lot frontage, or lot depth. In the proposed Chanhassen Civic Campus PUD, the PUD Ordinance is not proposed to modify any lot requirements from the base CBD zoning. SITE PLAN REVIEW Existing Conditions: The Chanhassen Public Library building will remain unchanged. A new book drop-off circle will be constructed to the north of the library building and will be accessed off Kerber Boulevard. No changes are planned for the veteran’s memorial. The existing city hall will remain in operation through construction of the new city hall. After construction of the new city hall is completed, the old city hall will be scheduled for demolition to make room for the new park amenities. The skate park equipment is planned to be relocated from the northern terminus of Market Boulevard to the northeast corner of the site abutting the rear parking lot of the Chanhassen Fire Station. No changes are planned for the fire station. Proposal The applicant is requesting approval for two government services buildings. Together the newly constructed buildings will consist of 61,108 square feet. The new city hall building at the corner of Market Boulevard and West 78th Street will include offices and meeting rooms for city staff, an updated senior center, council chambers, and underground parking for official city and sheriff vehicles. The new parks building off Kerber Boulevard will include event space, the concessions stand, public restrooms, and a large overhead canopy. Additional new amenities on the site will include an accessible playground and splash pad, a multi-purpose performance stage and lawn, a Page 7 of 21 skatepark, and four pickleball courts. The goal of these amenities is to increase the utilization of public land and to create a central gathering place within the city. The project proposes to increase the public park space and pedestrian network within the Civic Campus, which contributes towards the city’s goal of a walkable downtown. By bringing the city hall building from the inside of the site to the corner of Market Boulevard and West 78th Street, the government building will feel less secluded from the community. The site is encumbered by the existing infrastructure on the site. To maintain service during this transition, a phased construction approach is necessary. The demolition of the old city hall building cannot occur until staff are able to move into the new city hall building. Parking For public service buildings, the city code requires one parking space for every 500 square feet of floor areas in the principal structure, plus one parking space for every four seats within the public meeting rooms. Prior to reconstruction, this site contains 97 surface parking spaces and 24 covered spaces west of city hall and north of the library. East of city hall there are 64 surface parking spaces. The Chanhassen Fire Department currently has 30 parking spaces surrounding their building. There is a total of 215 parking spaces currently existing in the project area. According to the plans, the structured and surface parking west of city hall and north of the library will remain at the existing 97 surface parking spaces and 24 covered spaces. The surface parking lot east of city hall will be replaced with 51 surface parking spaces. Additionally, 37 surface parking spaces will be added north of Chan View for city staff. An additional 36 structured parking stalls will be provided below the new city hall for official city and Carver County Sheriff vehicles. The pickleball courts will have 10 additional parking spaces added to the east. The existing 30 spaces at the fire station will remain. This development proposes 285 total parking spaces after both phases of construction are complete. All parking spaces are within 400 feet of their intended use. For public service buildings, the city code requires one parking stall for every 500 square feet of floor area in the principal structure, plus one stall for every four seats within the public assembly area. In total, the city code would require 123 parking stalls based on floor area of the proposed city hall and parks building. 19 additional spots would be required for the number or seats in the council chambers, which would mean 142 parking stalls required total for the proposed buildings. Recreational facilities require 20 parking stalls plus one for every 500 square feet of the structure or two per court. For the park amenities, the skate park would require 41 parking stalls and the pickleball courts would require 8 parking stalls. With the request to rezone to a PUD, this development has more flexibility when it comes to total parking requirements. The total number of parking stalls required by the City Code for this development is 245 stalls, and the applicant is proposing a total of 285 parking stalls. This project will have a 40-stall excess of what the City Code requires. Page 8 of 21 City Code Required Parking Proposed Parking City Hall + Senior Center 119 221 Council Chambers 19 - Parks Building 4 - Library 24 24 Fire Department 30 30 Skate Park 41 - Pickleball Courts 8 10 Total 245 285 Site Furnishing The project as proposed shows many site furnishings as the goal of this project is to create a Civic Campus that creates community interaction on the property. The largest scale furnishings in conjunction with the city hall are a park pavilion, covered stage, pickleball court, skate court, playground facilities, and a splash pad. The existing Veteran’s Memorial will remain in place on the redesigned Civic Campus, with some minor landscaping work to enhance the surrounding area. The plans currently include a heated sidewalk that will connect the Senior Center of city hall to the nearest parking areas. Bike racks are proposed by the North-West parking lot, skate park, library drop off, and the North end of city hall. Loading and Refuse Screening of service yards, refuse, and waste-removal areas, loading docks, truck parking areas, and other areas which tend to be unsightly shall be accomplished by use of walls, fencing, dense planting, or any combination of these elements. Screening shall block views from public right- of-way (pedestrian views) and shall be equally effective in winter and summer. The electrical transformer shall be located on the SE corner of city hall recessed into the ground and fully screened. The generator shall be located toward the middle of the East side of city hall, fully recessed into the ground. The refuse collection shall be constructed within the central parking lot on Market Boulevard and shall be screened. Lighting A site photometric plan was provided with the application that details the lighting to be installed on Civic Campus. All fixture heights do not exceed 30 feet, the heights are as follows 20 feet, 18 feet, and 3 feet. Wall-mounted lighting in commercial, industrial, and institutional districts shall be shielded with a total cutoff angle equal to or less than 90 degrees. Shop drawings shall be provided to show proposed fixtures. Lighting on the building faces shall also be restricted to having a total cutoff angle equal to or less than 90 degrees. Signage The renderings provided depict signage for city hall and the park pavilion. Signage for the project will require separate permits and signage will be reviewed for conformance with the City Code at the time of the sign permit application. Page 9 of 21 Required Architectural Standards The City Code stipulates qualitative standards, not qualitative measures. Important emphasis is placed on high-quality design, balance, variety, and articulation. The Civic Campus project has shown great detail in design to existing conditions on site and around, but simultaneously created a unique, new design that is of high architectural quality. Architectural Style The City Code states that architectural style shall not be restricted and that the evaluation of the appearance of a project shall be based on the quality of its design and in relationship to its surroundings, guided by the provisions of City Code. Site characteristics to be evaluated for this purpose include building and landscaping, colors, textures, shapes, massing of rhythms of building components and detail, height of roof line, setback, and orientation. Designs that are incompatible with their surroundings or intentionally bizarre or exotic are not acceptable. Monotony of design, both within the projects and between adjacent projects and their surroundings is prohibited. Variation in detail, form, and sitting shall provide visual interest. Site characteristics that may be used for this purpose include building and landscaping, colors, textures, shapes, massing of rhythms of building components and detail, height of roof line, setback, and orientation. All buildings shall have a minimum of 20 percent accent material. Accent material may include brick, stone cut face block, or shakes. The use of any EFIS shall not be on the first story of any building or one story in height. City Hall Massing & Placement The proposed city hall building will occupy the South-East corner of the parcel, on the intersection of W 78th Street and Market Boulevard. The placement of city hall on the SE corner of the parcel promotes walkability and connects the Civic Campus with the downtown. The building is two stories tall with an underground level for parking. The height of the second story varies with the tallest portion at 43 feet tall, facing W 78th Street where the interior function is the Council Chambers. There is a step down in height to 28 feet tall for the second story on the East portion of the building fronting Market Boulevard, as well as the interior of the parcel on the West side of the building. The variation in height of the second story breaks up the massing of the building effectively and reacts to the changes in topography. The height of the Council Chambers provides an architectural statement for the building on W 78th Street, this element contributes to the vision of Chanhassen’s main street. The design for city hall features a 35-foot-tall clock tower abutting Market Boulevard and facing W 78th Street. The addition of the clock tower to the design balances and reacts to the Council Chambers extended height on the West side of the building, creating a harmonious design. Page 10 of 21 Elevations South Elevation North Elevation Page 11 of 21 West Elevation East Elevation The elevations proposed shall be reviewed and approved by the City Council. This shall include all exterior materials and the percentage of materials including but not limited to stone, brick, glazing, metal cladding, ACM panels, and cast-in-place concrete. Materials and Color The proposed city hall contains a variety of materials including three varieties of metal cladding, two varieties of ACM panels, stone veneer, two varieties of brick, and cast-in-place concrete. Two of the metal claddings are finished to look like wood in a light fir color. The color palette contains silver, black, off-white, grey, and light brown wood. Architectural Interest South Elevation - The elevation facing W 78th Street is the most public facing elevation on city hall. Details have been put into the architectural design to create interest through the modern clock tower and extended height of the second floor over the Council Chambers. Additionally, it is balanced through the metal clad articulation that separates the second and first floor, the strong pillar on the West side, and the angled accent columns underneath. Page 12 of 21 North Elevation - The elevation contains almost all the same characteristics, excluding the angles accent columns. The flat spaces on the face of the North elevation utilize material articulation and signage to create interest that compliments the rest of the design. West Elevation - The elevation grounds the building on the North end through use of dark colors, large, angled columns, and metal cladding separating floors to balance out the extended height of the Council Chamber on the South end. East Elevation - The elevation is sliced by the clock tower, its design sandwiches the dark metal cladding on the interior that is used for vertical circulation through the building. The dark brick on the bottom of the building grounds the design, adding weight to ensure the tall elements do not overtake the building design. Park Pavilion Massing and Placement The proposed park pavilion is located to the East of the existing parking lot on the West side of Civic Campus. This location is central to the outdoor amenities of Civic Campus such as the covered stage, lawn, splash pad, and playground. The building is one story at 11 feet tall, excluding the slanted roof articulation that creates a covered outdoor patio. Elevations South Elevation Page 13 of 21 North Elevation West Elevation Page 14 of 21 East Elevation The elevations proposed shall be reviewed and approved by the City Council. This shall include all exterior materials and the percentage of materials including but not limited to stone, brick, glazing, metal cladding, ACM panels, and cast-in-place concrete. Materials and Color The proposed park pavilion contains a variety of materials including three varieties of metal cladding, ACM paneling, stone veneer, brick, metal roofing, and cast-in-place concrete. One of the metal claddings is finished to look like wood in a light fir color. The color palette contains silver, off-white, black, light brown wood, and grey. Architectural Interest South Elevation - The elevation is simplistic in design but uses elements like extended overhangs of the roof on opposite ends to create interest that balances. North Elevation - The elevation is mainly compromised by the slanted roof accent that creates the covered patio below, on either side there are articulations in height to step down and bring the scale back to human interaction. West Elevation - The elevation faces the existing parking lot and contains a main entrance to the pavilion. The slanted roof accent is highlighted from this elevation and allows the community to pass under the outdoor covered patio. East Elevation - The elevation faces the interior of Civic Campus and addresses the outdoor amenities. There is a concession window and entrance to the pavilion. This is the other elevation that highlights the slanted roof and outdoor covered patio. Page 15 of 21 The main element of architectural interest in the design of the park pavilion is the slanted roof, not only is it a statement for the design but also the activation it will provide to the building in terms of community engagement. Outside of scheduled functions park buildings can become very quiet, creating a space that will offer more amenities to the community can boost the overall use and liveliness of the park pavilion. Easements The City of Chanhassen is proposing the preliminary plat “Chanhassen Civic Campus” which will re-plat Schneider Park Second Addition, as well as a city owned parcel to the east (PIN 250122100), into four (4) lots, Block 1 Lots 1-4, while also dedicating approximately 13,500 square feet of right-of-way along Kerber Boulevard and Laredo Drive. It is recommended that another parcel owned by the city abutting the preliminary plat to the east of Lot 2, PIN 250122010, be incorporated into the preliminary plat and be dedicated as public right-of-way (Market Boulevard). The lots are configured to accommodate the build-out of the Chanhassen Civic Campus project which includes a new City Hall, park pavilion, pickleball court and performance stage. Existing structures to remain include the Chanhassen Fire Station and the Chanhassen Library. The configuration of the preliminary plat meets Chanhassen City Code; adequate public drainage and utility easements are provided, and each lot will accommodate one primary structure. Grading & Drainage The Chanhassen Civic Campus is located in the northeast intersection of West 78th Street and Kerber Boulevard. The site is bound by Market Blvd to the east and City Center Park to the North. The existing site is developed with several buildings and associated parking lots. The site contains a significant amount of green spaces including the ball fields located north of City Hall. Drainage from the existing Civic Campus area is picked up in storm sewer throughout the site and routed to trunk storm sewer systems within Kerber Boulevard, West 78th Street and Market Boulevard. Trunk lines from the three adjacent roadways all combine into one trunk storm sewer line which continues south down Market Boulevard until it discharges into a large existing stormwater wet pond located just west of Market Boulevard and north of the Trunk Highway 5. In the proposed condition the site will be mass graded to facilitate the construction of the Civic Campus build out. The Library will remain unchanged but the rest of the site will be reconfigured. During Phase 1 of the construction the new City Hall Building will be built at the southeast corner of the site to allow the current City Hall to remain during construction. In Phase 2 the old City Hall building will be removed to allow the construction of the park gathering spaces. In the proposed condition drainage from the Civic Campus site will continue to be picked up in storm sewer and will connect into the same trunk storm sewer lines as it does under existing conditions. Drainage will continue to be routed to the existing stormwater pond west of Market Boulevard and north of Trunk Highway 5. Overall proposed drainage patterns onsite remain relatively consistent with existing conditions. The proposed design shows a small net increase in impervious area (0.07 acre). The existing storm sewer is anticipated to have capacity for the connections currently proposed. Page 16 of 21 The majority of the stormwater runoff generated by the site will be treated by a large regional Best Management Practice (BMP) facility that is being designed to treat stormwater generated by the Civic Campus Project, 24-01 Pavement Rehabilitation Project, and Market Boulevard Reconstruction Project. See the Storm Water Management section of the report for more information. While the stormwater treatment needs are anticipated to be met with the Regional BMP approach, staff is working with the Civic Campus designers to implement smaller BMP’s onsite such as rain gardens and filtration swales. The regional BMP facility is currently being designed by the engineering firm Kimley-Horn who was hired by the City to design the Market Boulevard Reconstruction Project. City Staff has collaborated with the engineers at Kimley-Horn and the Riley Purgatory Bluff Creek Watershed District (RPBCWD) to plan the regional BMP approach. A concept plan was presented to the RPBCWD board on January 25th and received support from the district’s board of managers during the meeting. Page 17 of 21 Erosion Control The proposed development will impact one (1) acre of disturbance and will, therefore, be subject to the General Permit Authorization to Discharge Stormwater Associated with Construction Activity Under the National Pollution Discharge Elimination/State Disposal System (NPDES Construction Permit). The applicant has prepared and submitted a Surface Water Pollution Prevention Plan (SWPPP) which was submitted as part of the preliminary plat application. The SWPPP is a required submittal element for final site plan review along with the Erosion and Sediment Control Plan (ESCP) in accordance with Section 19-145 of City Ordinance. No earth disturbing activities may occur until an approved SWPPP is developed. This SWPPP shall be a standalone document consistent with the NPDES Construction Permit and shall contain all required elements of the permit. The SWPPP will need to be updated as the plans are finalized, when the contractor and their sub-contractors are identified, and as other conditions change. All erosion control shall be installed and inspected prior to initiation of site grading activities. Streets The Chanhassen Civic Campus project does not propose the addition or extension of any public or private streets. However, the dedication of public right-of-way along Kerber Boulevard is necessary to accommodate the proposed improvements associated with the project. Along Kerber Boulevard, the project is proposing additional street parking, relocation of the existing sidewalk, and the addition of a crosswalk enhancement at the intersection of Kerber Boulevard and West Village Heights shopping center entrance. Additionally, there are relatively minor street impacts along W 78th, Market Boulevard, and Chan View to accommodate the build-out of the new City Hall as the site improvements are directly abutting the streets, as well as the relocation of a trunk water main. No impacts to Laredo are proposed as part of this project. Lastly, the city initiated a Downtown Chanhassen Traffic Study in 2023 in conjunction with on- going city projects (e.g., the Market Boulevard Reconstruction Project #25-02). The study evaluated existing conditions, conducted traffic forecasts, and reviewed multiple build conditions and future improvements for the Chanhassen’s downtown. The study included the Chanhassen Civic Campus project in its traffic forecasting and analysis. Due to the intensification of the redevelopment, which includes additional public amenities and public spaces, the study increased the existing volume counts at the entry points to the Chanhassen Civic Campus project by 10% (the north leg of W 78th Street and Market Boulevard, and the west leg of Kerber Boulevard and the North City Center Drive). If there are significant changes to the uses or redevelopment of the campus based on City Council direction, such as the addition or intensification of public amenities that would drive higher traffic volumes, it is strongly recommended that the city update the traffic study to accurately account for such changes. Sanitary Sewer & Watermain Due to the eventual total redevelopment of the Civic Campus area, a majority of the utilities abutting and internal to the development are proposed to be removed and/or relocated. The utility plans account for the required sanitary sewer and water services necessary to facilitate the build- out. These plans have already been reviewed by staff and were let for bidding as “Bid Pack 1”. Page 18 of 21 The city received competitive and favorable bid pricing as bids were lower than the engineer’s estimate by over one million dollars. Construction activities associated with the underground utilities, including sanitary sewer and watermains, are scheduled to begin in the summer of 2024. Permits from the appropriate regulatory agencies will have to be obtained, including but not limited to the MPCA, NPDES, Minnesota Department of Health, Riley Purgatory Bluff Creek Watershed District. Storm Water Management Article VII, Chapter 19 of City Code describes the required storm water management development standards. Section 19-141 states that “these development standards shall be reflected in plans prepared by developers and/or project proposers in the design and layout of site plans, subdivisions and water management features.” These standards include abstraction of runoff and water quality treatment resulting in the removal of 90% total suspended solids (TSS) and 60% total phosphorous (TP). The proposed project is located within the Riley Purgatory Bluff Creek (RPBCWD) and is therefore subject to the watershed’s rules and regulations. A RPBCWD permit will be required for final plat approval. A Stormwater Management Report is required to be submitted for review to confirm all applicable stormwater management requirements are being met. This includes rate control, volume abstraction and water quality requirements among others. The site is proposing to meet stormwater management requirements through the use of a proposed regional BMP facility which will be used to irrigate the green spaces proposed as part of the Civic Campus reconstruction including the existing ball fields located within City Center Park. The regional water reuse system will draw stormwater from the large existing stormwater pond that the Civic Campus Site discharges to west of Market Boulevard and north of Trunk Highway 5. Stormwater will be treated with a UV system and pumped by a lift station back to the Civic Campus Site for irrigation through a force main that will run south to north along the Market Boulevard corridor. The regional stormwater reuse system is proposed to provide treatment for other public improvement projects in addition to the Civic Campus including the 24-01 Pavement Rehabilitation Project, and the Market Boulevard Reconstruction Project. A permit application for the regional BMP’s design will be submitted as part of the 24-01 Pavement Rehabilitation Project which is anticipated to be submitted by March 15th, 2024. All comments from RPBCWD will need to be addressed. The applicant shall provide final versions of all modeling (HydroCAD and MIDS) and Stormwater Management Report to address remaining comments and confirm rate, volume and water quality requirements are met as part of the final plat approval. The concept of the regional BMP design is that larger more regional treatment strategies can provide better treatment at lower capital and maintenance costs than smaller individual practices. Regional BMP designs are encouraged by the City of Chanhassen’s Local Surface Water Management Plan. This specific design is especially encouraging as it will provide water quality benefits that exceed what the individual projects could accomplish while also reducing the water consumption from the City’s irrigation system. The regional BMP system is anticipated to be completed and brought online in 2025 when the Marketplace Boulevard Project is constructed. Page 19 of 21 As outlined in the City’s Surface Water Management Plan adopted in December 2018, the City requires at least 3 feet of freeboard between a building elevation and adjacent ponding features’ high water levels. Currently there are no onsite BMPs identified on the plans with high water levels noted to confirm freeboard requirements against. If onsite BMPs are added to the plans, freeboard requirements will need to be confirmed to be met. The proposed BMPs are to be publicly owned and maintained. A maintenance plan for all proposed BMPs will be required and should include the maintenance schedule, responsible party, and include information on how the system will be cleaned out as necessary. A maintenance declaration with the RPBCWD will be required to ensure that the City property maintains the site’s stormwater infrastructure. Assessments As the project will be conducted by the city, no assessment or fees will be charged. Staff Plan Comments Forestry Department: 1. Applicant shall confirm the extent of the grading associated with the trail extension on the Northwest side of the parking lot so impacts to surrounding trees can be assessed. 2. Applicant shall adjust the planting list to include quantities that follow the city’s species diversity requirements where no more than ten percent of the trees may be from any one tree species, no more than 20 percent of the trees may be from any one genus, and no more than 30 percent of trees from any one family. 3. Applicant shall adjust the silt fencing on the plans to show that it is outside of the tree protection fencing in all areas. 4. Applicant shall adjust the landscape plans to include the removals discussed during the meeting with the City Forestry Consultant and Environmental Specialist. Engineering Department: 1. All sanitary sewer and watermains will be publicly owned and maintained after acceptance of the public improvements by the City Council. 2. The city shall ensure that permits are received from all other agencies with jurisdiction over the project (i.e. Army Corps of Engineers, DNR, MnDOT, Carver County, Riley Purgatory Bluff Creek Watershed District, Board of Water and Soil Resources, MPCA, etc.). Page 20 of 21 Water Resources Department: 1. The applicant shall secure a signed permit from the RPBCWD prior to the start of construction activities. 2. The applicant shall update the models (HydroCAD and MIDS) per City and any watershed district comments and submit updated computations and models in their native forms with the final plat submittal. 3. Prior to the final plat submittal, the applicant shall work with staff to revise and optimize the design of any onsite BMPs and/or stormwater infrastructure. 4. An Operations and Maintenance plan for all proposed BMPs including the inspection frequency, maintenance schedule, and responsible party shall be submitted for review with the final plat application. 5. The applicant shall enter into an Operations and Maintenance Declaration with the RPBCWD for all proposed stormwater facilities which shall be completed concurrently with the final plat. 6. A Stormwater Management Plan is required noting how all stormwater management requirements are proposed to be met. These requirements include volume abstraction, water quality and rate control among others shall be included in the final plat application. References to the Regional BMP design and permit application are anticipated. 7. If onsite BMPs are added to the plans, information on the proposed HWLs shall be noted on the plans and documentation provided to confirm the City’s freeboard requirements are being met. Building Department: 1. A building permit must be obtained before beginning any construction. 2. Building plans must be prepared and signed by design professionals licensed in the State of Minnesota. 3. Building plans must provide sufficient information to verify that the proposed building meets all requirements of the Minnesota State Building Code, additional comments or requirements may be required after plan review. 4. The building is required to have automatic fire extinguishing systems. 5. Structure proximity to property lines (and other buildings) will have an impact on the code requirements for the proposed buildings, including but not limited to; allowable Page 21 of 21 size, protected openings, and fire-resistive construction. These requirements will be addressed when the complete building and site plans are submitted. 6. Building plans must include a code analysis that contains the following information: Key Plan, Occupancy group, Type of construction, Allowable height and area, Fire sprinklers, Separated or non-separated, fire resistive elements (Ext walls, bearing walls - exterior or interior, Shaft, Incidental use), Occupant load, Exits required (Common path, Travel distance), Minimum plumbing fixture count 7. Retaining walls (if present) more than four feet high, measured from the bottom of the footing to the top of the wall, must be designed by a professional engineer and a building permit must be obtained prior to construction. Retaining walls (if present) under four feet in height requires a zoning permit.