Proposal for September 11, 2020 Downtown Flood Improvement Study

Contact: Timothy Olson, P.E., CFM 651-724-0404 [email protected] 12224 Nicollet Avenue | Burnsville, MN 55337-1649 Ph: (952) 890-0509 | Fax: (952) 890-8065 | Bolton-Menk.com 12224 Nicollet Avenue Burnsville, MN 55337-1649

Ph: (952) 890-0509 Fax: (952) 890-8065 Bolton-Menk.com

September 11, 2020

Dave Bennett, P.E. Public Works Director/City Engineer City of Northfield 801 Washington St. Northfield, MN 55057

RE: Proposal for Downtown Flood Improvement Study

Dear Mr. Bennett:

The City of Northfield has initiated the Downtown Flood Improvement Study to prepare for climate change impacts while also maintaining a safe community. Like you, Bolton & Menk, Inc. takes great pride in designing and managing projects that are sustainable and beautiful. Our approach to engineering services makes the City of Northfield’s priorities our priorities. We understand what needs to be accomplished for the successful completion of the Downtown Flood Improvement Study.

We Know Northfield – Our team has completed a wide variety of stormwater management work in the City of Northfield, including a regional assessment of your drainage systems, comprehensive hydraulic modeling, and various flooding assessments. We have also examined FEMA certified floodplain modeling for several important tributary creeks and the Cannon River. Our intense knowledge of your systems ensures we can provide a quick and accurate analysis of your downtown area.

Project Management – Reactive project management can create chaos, delays, and overruns. We will ensure that open lines of communication are maintained from project conception through closeout. Open communication will be implemented to clearly identify expectations of both Bolton & Menk and Northfield staff.Tim will lead reviews with the city to identify risks and ensure surprises don’t arise along the way.

An Experienced Team – We have successfully completed numerous flood plain assessment and mitigation projects. We are experts in FEMA approved riverine modeling using innovative software and geospatial techniques; two-dimensional modeling applications that focus on break out flows and streambank stability; and FEMA certified flood control measures including levees and dams and the required internal drainage assessments. Our project team includes certified floodplain managers with more than 50 years of experience helping communities understand their risk of flooding and prepare for safe and sustainable flood protection.

In continued service to the City of Northfield, we are excited at the opportunity to complete the Downtown Flood Improvement Study. I will personally serve as your lead client contact and project manager. Please contact me at 651-724-0404 or [email protected] if you have any questions regarding our proposal.

Respectfully submitted, Bolton & Menk, Inc.

Timothy Olson, P.E., CFM Project Manager

Bolton & Menk is an equal opportunity employer. TABLE OF Project Understanding and Approach 3 Previous Experience 12 CONTENTS Project Team 15 References 23 Cost Proposal 24 PROJECT UNDERSTANDING AND APPROACH Section 1 Project Understanding and Approach 3

PROJECT UNDERSTANDING AND APPROACH Northfield’s Identity History of Flooding The Cannon River, a designated Wild and Scenic River, Northfield is situated approximately halfway between is a critical component to the City of Northfield’s the headwaters in Waterville and the confluence of environmental identity and gives the community a sense the Mississippi near Red Wing. The watershed area of place. Northfield has developed around the Cannon at the downstream end of Northfield is approximately River for nearly 150 years, starting as primarily an 940 square miles. Flow accumulation and, in turn, the agricultural community. As the downtown area expanded, potential for flooding for a watershed of this size can be the river was its focal point. The city has worked substantial, especially considering the Cannon River’s tirelessly to ensure residents and business owners feel relatively steep slope (2.3 feet of fall-per-mile). connected to the river and that it is integrated into the community. The city has also committed to protecting the Most recently, flooding in the Cannon River impacted Cannon River as a defining natural feature and enhance Northfield in 2010, 2016, and 2019. In September 2019, it when possible as development and redevelopment KSTP interviewed Northfield’s police chief who observed projects occur. “… some pretty interesting examples where it’s gone up four or five feet in less than six or seven hours”. This Unfortunately, river systems like the Cannon bring with description of flash flooding in the Cannon River makes it them the potential to flood. While the river is the identity a particularly sensitive issue for Northfield’s public safety. of Northfield and direct connectivity is an important goal, public safety and protection of critical infrastructure The increase in frequency of shorter duration and higher must be considered. Bolton & Menk is currently helping intensity storms is evident in Northfield. According to the the city with its commitment to understanding its last 10 years of precipitation record, there have been stormwater management system by developing regional • Approximately 11 rainfall events approaching 2.8 hydraulic modeling and summarizing potential drainage inches (a 2-year event) improvements. The next step in understanding the city’s • Approximately 3 rainfall events exceeding 4.2 inches overall safety is to consider improvements in critical river (a 10-year event) flooding areas. • One rainfall event approaching 6.2 inches (a 50-year event)

According to FEMA’s Community Information System, Northfield has a total of 44 flood insurance policies totaling approximately $14,000,000 in coverage. Since 1978, the city had 29 insurance claims totaling approximately $2,700,000. Northfield is one of the most frequently impacted communities in Rice and Dakota Counties.

Downtown Flood Improvement Study | City of Northfield, Minnesota S pring Cr eek

Project Understanding and Approach 4

43

Legend St Olaf Ave Parcels Flood Prone Properties Zone AE Floodway 2nd St W 2nd St E Zone AE

.2 PCT Annual Chance 3rd St W

Ames Park 78 Union St 5th St W

6th St W Division St S Riverside Lions Park

8th St W Babcock Park Spring St S Poplar St

Woodley St W 28

Commitment to Climate Adaptation and Resiliency Climate change has rapidly affected weather patterns, resulting in shorter duration, higher intensity storms, and the potential for more extreme and sudden flooding. By assessing rainfall events larger than the 100-year and/or assessing the systems drainage capacity under recently recorded, real-world rainfall events, flooding assessments can inform decisions about drainage capacity, property protection, critical site access, and public safety. By including climate adaptation and resiliency as long-term goals, the city’s comprehensive plan can be strengthened.

The City of Northfield can rely on Bolton & Menk’s understanding of, and experience in, effective planning for a resilient community. The Metropolitan Council has also offered numerous strategies for developed areas to better integrate resiliency into comprehensive planning. The city can apply these concepts at the same or smaller scale because you already recognize that future development is contingent upon adaptation to changes in soil capacity, heat island effect, loss of watershed storage, increases in flooding, degradation of water quality, loss of wetland habitat, and many more. The downtown Cannon River corridor is certainly no exception. Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 5

Project Funding and Planning for for flood mitigation on the Cannon River and intend to leverage our knowledge of your system to help you work Future Phases through all three phases of this important project. The preliminary work completed in Phase 1 must consider constructability, which may require as much as a 30% design. Bolton & Menk is an extension of city Engaging and Informing the staff and we are ready to identify critical components of Community Phase 1 that can be leveraged into cost savings for Phases Bolton & Menk prides itself on successful public 2 and 3. We have helped numerous communities not only involvement processes. An engaged and informed develop lasting solutions to flooding, but apply for and public is the best way to garner project support and secure funding from the same source. We understand reduce conflict during implementation. We employ a what is needed during the planning phase to ensure consensus-building approach that blends the creativity positive outcomes in future phases. of project stakeholders with Bolton & Menk's professional expertise. This can be accomplished using Phase 2 involves preparing a benefit-cost analysis various tools, including that will require a maximized ratio of benefit to • Public information meetings/hearings, informal open cost. Therefore, a thorough cost assessment must be houses, and neighborhood gatherings—scheduled completed to ensure future projects are in a fundable for convenience to residents and neighborhood range. Phase 3 will include developing construction business owners and considering all applicable social plans and specifications. distancing policies • Brochures, newsletters, maps, and other graphics Our Partnership distributed by mail or email The City of Northfield and Bolton & Menk have a • Free-standing project website or content to be hosted rich history of project collaboration and a mutual on city’s website understanding of regional drainage and flooding on the • Social media posts including links and graphics to Cannon River. In 2010, Bolton & Menk performed a promote events through established city-managed or flood wall survey for the City which included extensive new accounts survey of the wall and some adjacent finished floor Sometimes, the voice of the majority can be overpowered elevations. Soon after, Bolton & Menk helped identify by the voice of the minority who have strong opinions some critical elevations at Basil’s Pizza including a about the project. By applying our understanding of your topographic survey of the site. In 2017, we completed goals, we can select the appropriate tools to effectively a study of the Spring Creek Watershed in response to develop community consensus for the Downtown Flood flooding along the creek, which included some options Improvement Study. We are adept at working with your for peak flow rate and flood elevation reduction. communications staff to solicit input using methods that have proven successful in the past; and providing the Bolton & Menk is currently finalizing a comprehensive appropriate level of creativity to garner public consensus. stormwater management plan and regional hydraulic model to identify critical infrastructure needs and potential pond flooding conditions. We are ready to continue to collaborate and develop innovative solutions

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 6

Other Important Considerations Bolton & Menk has received a copy of FEMA’s current effective floodplain model of the Cannon River through Northfield. We have verified this model includes some recent modifications made to ensure proper tie-in with other hydraulic models at the Rice/Dakota County border. However, that modeling effort did not include any updates to geometry. We have discovered the following important information, and the city should consider an update to the existing conditions hydraulic model so that the foundation is properly set for what could be a major flood improvement project. The existing conditions are critical, and without a solid foundation, the basis for which the city applies for funding could be flawed.

• The geometry in the current effective hydraulic model is from the original HEC-2 modeling from the 19070s; there are about 12 data points per cross section, and no additional detail like building obstructions. • The model shows about 35 cross sections, four bridges, and the dam; two additional pedestrian bridges are not included in the model • If we can confirm that no structures were replaced since the 1970s, then it may be adequate to simply georeference the model trough a complex GIS process, perform some limited updates to the areas outside the channel in the flood fringe, and assume the channel geometry is adequate • The city’s constructed floodwall is not included in the model • Bolton & Menk strongly suggests the city consider a major update to the existing conditions model; that would include updating cross sections to the most current LiDAR, consider updates to the channel geometry-based a more recent bathymetric assessment, add cross sections to increase detail through the downtown corridor and set up for future conditions, include proper flood plain obstructions and expansion and contraction areas, add the pedestrian bridges, update the other structures as needed, and other potential updates.

The following figure shows a Cannon River Cross Section between the nd2 Street West and Water Street bridges. A noticeable difference can be seen between the current effective model (pink line) and a cross section cut from LiDAR (black line). The LiDAR cross section is much more representative of the actual conveyance in the river bank and floodplain. Also, building structures have been added to show the potential for obstructions in the floodplain that could affect base flood elevation.

Final_Cannon_Rice_Dakota-edited Plan: 1) Modified_Lidar 2) dakota Geom: Modified_Lidar Our proposal RS = 215254 Corresponds to Cross-Section 112.1 (1981 FIS XS L) of the City o

930 Legend includes optional WS 100-yr - dakota WS 100-yr - Modified_Lidar tasks for updating Ground - dakota Ineff - dakota Bank Sta - dakota the hydraulic model - Modified_Lidar Ground - Modified_Lidar 920 Levee - Modified_Lidar and performing a Ineff - Modified_Lidar Bank Sta - Modified_Lidar bathymetric survey. The city may wish to

910 forgo these tasks, which we result

Elevation (ft) in an adjusted fee. Both options are 900 summarized in our proposed work plan. 890

880 2600 2800 3000 3200 3400 3600 3800 Station (ft)

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 7

Other Important Considerations The three phases described in the request for proposals may be limited relative to the city’s funding source. However, Bolton & Menk is ready to help the city establish a framework that addresses a holistic public safety approach to flood conditions: • Continue to develop and evolve the Surface Water Management Plan and regional hydraulic modeling to consider public safety under extreme conditions • Identify solutions in other areas where flood insurance policies and claims are prevalent • Include climate adaptation and resiliency in your planning efforts and leverage your investment in extensive stormwater drainage information to let regional management systems guide development, not the other way around • Consider participating in FEMA’s Community Rating System (CRS) program; by exceeding the minimum NFIP program requirements, Northfield could be eligible for reductions in insurance premiums, translating to savings for residents and business owners. Northfield is currently listed in Minnesota’s list of top 50 CRS eligible communities.

For more information on CRS, please visit the following link. https://youtu.be/fj84x-dh6aE

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 8

Scope of Services Task A.3: Gather As-Built and GIS Data Task A: Data Gathering & Fortunately, Bolton & Menk has already collected much of the GIS information for other projects throughout the Communication city. We will also gather any applicable as-built plans for Task A.1: Conduct Kickoff Meeting critical infrastructure in the downtown corridor. Bolton & Menk will schedule and facilitate a project kickoff meeting to understand the project’s history, discuss Task A.4: Present to City Council city goals and project logistics, and develop a schedule. Bolton & Menk will present the results of the Downtown Flood Improvement Study to the Northfield City Task A.2: Complete Field Survey Council on three occasions—preliminary analysis and Bolton & Menk will coordinate with the eight property recommendations, final recommendations, and final report. owners to access their building and obtain the lowest floor elevation and lowest opening elevation for each Task A.5: Facilitate Public Meeting of the eight properties listed. We will also collect key As part of the public input meeting, we would seek input spot elevations along the Riverwalk to show openings from residents, business owners, and other stakeholders in the wall, top of wall elevations, and low points along on the draft flood mitigation layouts before developing the walk. We will also collect key spot elevations at low final concepts and cost estimates. This could be areas of the parks and along the bank of the river adjacent accomplished as a virtual open house with staff available to the Ames Park, Riverside Park, and Babcock Park to to discuss any of the designs or could also be more illustrate low points that contribute to flooding and will focused discussions with impacted business owners. Our incorporate Lidar data for the remainder of the parks. fee anticipates an open house salon format with an online This data will be tied into MnDOT control and the City of input component to broaden participation opportunities. Northfield benchmark system so it can be combined with The following tasks are included in our fee estimate other data in the area. • Develop informational graphics • Develop public handouts Optional Task A.2B: Bathymetric Survey • Coordinate the meeting Based on the Flood Insurance Study (FIS), the Cannon • Develop a meeting presentation River model through Northfield was revised by the • Setup, host, and attend the virtual meeting Minnesota Department of Natural Resources (MnDNR) • Summarize public input information and a partnering consultant in 2003. In 2012, a letter of map revision (LOMR) was performed to tie the Cannon We propose using Zoom for the virtual open house due River Model into portions of a Dakota County model. to its functional chat feature for submitting questions The original modeling for the Cannon River dates back and responses; the ability to solicit questions before the to 1977. The current effective modeling makes it difficult meeting; the ability to record audio, video, and chat logs; to tell whether the channel bottom was surveyed, and if and the ability to distribute the audience into breakout it was, when. It may be prudent for the city to consider rooms based on topic, interest, location in the floodplain, updating the bathymetric survey because the elevation of or other personal motivations. the channel bottom could result in a significant difference in the cost of a future flood wall. While not included in the city’s scope, we feel it would be a worthwhile investment to perform a bathymetric survey early on in Phase 1. This is included as an optional task and can be removed should the city wish to forgo the survey.

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 9

Task B: Evaluate Flood Mitigation We will specifically assess the critical properties identified by the city and compare the field survey data to Solutions the base flood elevations. Task B.1A: Review Cannon River Hydraulics Bolton & Menk will prepare a summary of the Bolton & Menk has obtained the current effective review and make recommendations for additional hydraulic model associated with the FEMA designated modeling, as needed. Additional cross sections may special flood hazard area along the Cannon River. be required to fully identify future improvements, We have verified this model includes some recent but we assume LiDAR surface topography is modifications made to ensure proper tie-in with other accurate enough for these determinations. If we find hydraulic models at the Rice/Dakota County border. other significant discrepancies, missing information, or bridge survey requirements, we will inform the The United States Geological Survey has a gage on the city of any potential changes in the direction of the Cannon River at Northfield that collects stage, discharge, scope and schedule. and precipitation from 2012 to present. This is a relatively small subset of data, but may include some important Optional Task B.1B: Update Existing information regarding recent rain events. Bolton & Menk Conditions Model will briefly assess the data and summarize its potential Based on our cursory review of the current effective use for this study. hydraulic model, numerous elements appear out of date. Establishing an accurate existing conditions model is critically important when determining the benefit of proposed flood mitigation solutions. Therefore, Bolton & Menk suggests the following updates to the existing conditions hydraulic model. • Update the current cross sections, and add new cross sections where detail is needed, with the most current LiDAR topography • Include building obstructions where necessary • Update and confirm expansion and contraction coefficients and ineffective flow areas • Update channel geometry using bathymetric survey information, should the city consider collecting the survey • Add pedestrian bridges and updated bridge geometry, should the city consider collecting the survey The most recent floodplain model does not include the • Ensure proper tie-in at the Rice/Dakota County line 50-year and 500-year rainfall events. These discharge • Verify modeling with the MnDNR, Rice County, and values may have been developed by the DNR or FEMA’s Dakota County for preliminary concurrence; this will mapping partner, so we will work with the agencies establish an initial review touchpoint for a future to develop these flow values. If they do not exist, we Letter of Map Revision (LOMR) will use regional regression equations to develop peak discharge values for the 50-year and 500-year events, understanding that these events should not be used for regulatory purposes until approved by FEMA.

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 10

Task B.2: Review Flood Solutions Our team will use information gathered at the kickoff meeting to explore potential flood mitigation solutions, keeping in mind that the project benefit to cost ratio will be critical in future funding phases. Our fee assumes up to three flood mitigation solutions will be developed. The set of proposed solutions will focus on those most important to the city. The solutions may include, but are not be limited to, extending the Riverwalk walls, add new flood walls/levees, consider temporary walls, and property acquisition. We will also address solutions that require FEMA certification and whether these solutions are feasible in terms of elevation tie-in points. It is also assumed that all preliminary solutions will be reviewed and approved by the city before developing cost estimates.

The recommended solutions will factor in potential flooding in park property. The magnitude of flooding in parks will be tracked with each solution.

A summary of the preliminary flood solutions will be presented to the city for review. Modifications to the solutions will be complete and presented to city staff and city council.

Bolton & Menk has invested in an innovative software solution called GeoHEC-RAS, by CivilGEO. GeoHEC-RAS is essentially a GIS-based front loader for HEC-RAS projects that allows the user to easily add modeling elements and generate flood plain extents. This helps expedite the modeling and mapping process and allows for rapid model manipulation as the project team narrows in on feasible flood mitigation solutions.

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Understanding and Approach 11

Task B.3: Prepare Cost Estimates and Task B.4: Develop Operation and Summary Report Maintenance Costs Preliminary engineers’ estimates will be developed for up Each of the three proposed solutions will include to three approved preliminary solutions. Cost estimates operations and maintenance costs. This will include will be delivered to the city for review and approval. general physical maintenance, potential mechanical maintenance of pumped solutions, and life cycle and Bolton & Menk will also assemble a summary technical replacement estimates. memo describing project methodology, summary of modeling results, description of proposed improvements, The preliminary flood solutions summary will be and all assumptions that may factor to Phases 2 and 3. modified to include operation and maintenance planning and associated costs. Preliminary operation and maintenance plan will be presented to the city for review, and all modifications will be incorporated.

Task B.5: Map the Flooding Extents for the Proposed Solutions We will map the existing 50-, 100- and 500-year floodplains, including the ultimate extent of flooding and a digital elevation model of the flood depths. The recommended solutions will be built into the model to show the overall impact of flooding for each required discharge event.

A draft map of the flood extents will be presented to the city for review when the summary of preliminary flood solutions is developed.

Schedule 2020 2021 Month September October November December January February March Week of 7 14 21 28 5 12 19 26 2 9 16 23 30 7 14 21 28 4 11 18 25 1 8 15 22 1 8 15 22 29 A Data Gathering & Communication A.1 Conduct Kickoff Meeting A.2 Complete Field Survey A.3 Gather As‐Built and GIS Data A.4 Present to City Council A.5 Facilitate Public Meeting B Evaluate Flood Mitigation Solutions B.1 Review Cannon River Hydraulics B.2 Review Flood Solutions B.3 Prepare Cost Estimates and Summary Report B.4 Develop Operation and Maintenance Costs B.5 Map the Flood Extents for the Proposed Solutions

Downtown Flood Improvement Study | City of Northfield, Minnesota

11 PREVIOUS EXPERIENCE Section 2 Previous Experience 12

PREVIOUS EXPERIENCE

A sampling of recent projects with similar tasks and challenges to the Downtown Flood Improvement Study follows. Client satisfaction through quality deliverables, cost-effective rates, and timely project delivery are top priorities for Bolton & Menk. Please contact the references at the end of the proposal to evaluate our performance on similar projects. Additional references are available upon request. Turtle Creek Flood Mitigation, City of Austin, Minnesota Turtle Creek in Austin has a history of flooding. Historically, homes were constructed near the creek in the floodplain area. Therefore, Bolton & Menk began analyzing the Turtle Creek flood corridor to determine the feasibility of temporary flood protection versus permanent accredited levee construction. The city decided to construct a levee that would ultimately be accredited by FEMA and remove homes from the flood plain.

Along Turtle Creek, new levee construction protects homes from destructive flooding for current and future owners. Hydraulic analyses and internal drainage assessments were performed to ensure FEMA compliance and validate the protection of critical infrastructure. The City of Austin will rest assured that homeowners, business owners, and other recreationists remain safe while Turtle Creek is flooded.

A Conditional Letter of Map Revision (CLOMR) was submitted to ensure that the project, if constructed to plan, will comply with all FEMA accreditation requirements. The final flood mitigation project will include levees and pumping stations to ensure public safety for 1 percent chance of an annual flood.

Sand Creek Flood Analysis and Remapping, City of Jordan, Minnesota The City of Jordan, Scott County, and MnDNR have worked tirelessly for several years to develop hydrology and hydraulic models. FEMA released Draft Flood Insurance Rate Maps (FIRM) and errors in the mapping and flood elevations were discovered.

A review of the existing accepted models led to an update of the hydrologic modeling approach. A brief review of the results led the team to conclude that a significant split in the flow may occur near U.S. Highway 169 in Jordan and flow east into the adjacent wetland complex before it later rejoins the Sand Creek watershed south of the city. Further review also identified several areas that were likely affected by changes to the new edition of HEC-RAS and required further detail to balance the model. New cross-sections were incorporated into the model by using the Scott County one-meter DEM topographic maps. Final culvert and bridge details will need to be acquired by field survey before a final model can be submitted for review by the MnDNR and FEMA for incorporation into the new FIRMs.

Downtown Flood Improvement Study | City of Northfield, Minnesota Previous Experience 13

Preliminary results of the updated modeling showed a significant decrease in base flood elevation (BFE) in the lower reaches of the Sand Creek watershed and a likely increase in BFE in the upper reaches. A new, unsteady hydraulic model was developed to better estimate flooding depths along Sand Creek and to take into account a large storage area that was otherwise neglected in the original modeling. Bolton & Menk partnered with the MnDNR to accommodate FEMA’s requirements for flood plain model revisions to ultimately get the new mapping approved. The City of Jordan now has an accurate flood plain map and base flood elevations by which they can regulate flood plain development.

Bolton & Menk worked with the MnDNR and other funding agencies to secure a partnership to develop a flood mitigation plan and preliminary levee alignments and costs. Project engineer’s estimates ranged from $5.7M to $9.5M. The city is ultimately pursuing funding for approximately $5.7M in project costs.

Spring Creek Watershed Analysis, City of Northfield, Minnesota The City of Northfield developed critical information regarding their regional drainage system along Spring Creek. The comprehensive stormwater management system model identified locations for peak flow mitigation that have the largest overall reduction in peak flow along the main stem of Spring Creek.

Flood storage areas were analyzed to determine if a large storage area along the main channel would result in additional benefits to reduce flooding through town. Overall, the peak discharge in the main channel could be reduced from approximately 1,100 cfs to 800 cfs; flood elevations downstream along Spring Creek drop an average of 0.8 feet.

The City of Northfield received a feasibility report, which included several recommendations for peak flow mitigation to be implemented over time to support safe and effective development in the urban expansion area. The city also implemented a jurisdictional flow rate at the upstream city limits to maintain FEMA flood hazard zones as development continues.

Downtown Flood Improvement Study | City of Northfield, Minnesota Previous Experience 14

Mapes Creek Letter of Map Revision, City of Watertown, Minnesota New FEMA floodplain maps were issued for Carver County, effective December 2018. Following issuance of the new maps, the City of Watertown identified several properties impacted by the updated mapping. Bolton & Menk served as a consultant to the city and worked directly with the Minnesota DNR and FEMA to update the FIRM maps to reflect a revised floodplain and floodway delineation.

Bolton & Menk prepared a LOMR application for Mapes Creek and processed the application with the City of Watertown, Carver County, Minnesota DNR, and FEMA. By working directly with the Minnesota DNR on modeling and mapping efforts, we quickly resolved mapping discrepancies and updated the maps to reflect the correct floodplain and floodway delineations along Mapes Creek. FEMA Floodplain Mapping Projects, Various Communities, Minnesota, North Dakota, Iowa, and South Dakota Bolton & Menk has conducted numerous floodplain assessments, floodplain mapping, and flood management projects across Minnesota, North Dakota, Iowa, and South Dakota. The following summarizes some of these key projects: • Waterville, MN – modeling of Dams along Cannon River and remapping of floodplain from Waterville to Warsaw • Meeker County, MN – DFIRM Mapping, Cooperating Technical Partner to MnDNR and FEMA • Lake Crystal, MN – County Ditch 56 FEMA remapping; LOMR application and approval • Winsted, MN – LOMR based on added culverts and impacts to residents along a county ditch and Lake Winsted • Fargo, ND – Selkirk 1st Addition, LOMR-F, the City of Fargo called this an “excellent submittal” and asked to use the submittal as a learning tool for other consultants • Fargo, ND – Assessment of regional drain based on development proposal; design of internal drainage and impacts to adjacent 100-year floodplain • Cherokee, IA – HEC-RAS model for Railroad Creek, modeling and mapping used for the state’s MapMod project • Rapid City, SD – private development floodplain mapping and flood mitigation solutions; extensive modeling of Box Elder Creek and impacts to future floodplain fill; resulted in LOMR-F application

Downtown Flood Improvement Study | City of Northfield, Minnesota PROJECT TEAM Section 3 Project Team 15

PROJECT TEAM

The Bolton & Menk team serves as an extension of city staff, maintaining close coordination between the city and project team. The proposed team provides the optimum combination of accessibility, community knowledge, and specialized expertise. Our project manager, Tim Olson, will be supported by key individuals and support staff. Bolton & Menk can draw upon more than 550 other team members throughout our firm, as needed, to meet your needs. Project team member bios are included below and résumés are included at the end of this section.

Tim Olson, P.E., CFM administration from conception through construction. His Project Manager background as a project manager includes development and design of municipal reconstruction projects, with Tim will oversee the project an expertise in trenchless technology techniques. Over team, manage overall project the years, Brian has fostered strong relationships with schedule, scope and fee, and both his clients and employees. He is passionate about remain in close contact with the mentoring and helping train young EITs on proper city to address any project concerns. construction observation skills and career development. Tim has been a water resources engineer with Bolton & Menk since 2006. His experience includes project Roberta Cronquist, P.E., CFM management in both design and construction of Lead Floodplain Engineer complex water resources and environmentally sensitive projects. He specializes in comprehensive surface water Roberta will use her years management planning; innovative best management of expertise to lead the practice design; detailed hydraulic and hydrologic flood plain modeling effort modeling; drainage design and construction plan and develop recommended review; NPDES Phase I & II MS4 and construction solutions to flooding. stormwater permitting requirements; and coupling GIS Roberta loves solving problems, coming up with new techniques with water resources design and analysis. solutions, and finding ways to make projects more Tim has a passion for stormwater and water quality efficient and sustainable. Her role as a water resources education and participates in several stormwater-related project manager allows her to do just that. She began steering committees and stakeholder groups. He enjoys her career in 1998 and has experience in drainage facilitating partnerships, developing new relationships, design, floodplain management, river engineering, and collaborating with stakeholders to define a common bridge hydraulics, stream restoration, sediment transport vision and work toward shared goals. modeling, and stormwater treatment. Roberta is also experienced with hydrologic and hydraulic modeling Brian Hilgardner, P.E. and integrates GIS to develop regional comprehensive Principal-in-Charge drainage plans. She is proficient in the use of HEC-RAS and HECGeoRAS, Fluvial-12, MicroStation, GeoPak, Brian will oversee the quality XPSWMM, and Autodesk Storm and Sanitary Analysis. of services to ensure the city is completely satisfied. He will Roberta has extensive experience managing very large work closely with Tim to ensure scale flood mitigation projects. Her ability to utilize that project schedule, budget, and highly technical floodplain modeling, digest and progress is monitored, and critical communicate critical floodplain regulation, work with issues are addressed in a timely manner. FEMA to expedite approval, and work with city staff and When it comes to clients, Brian takes time to get to the public makes her a unique and critical member of the know them on a deeper level, building trust in him and project team. the Bolton & Menk team. Since beginning his career in 1998, he has gained a range of experience in project

Downtown Flood Improvement Study | City of Northfield, Minnesota Project Team 16

Dallas Jones, CFM, EIT Liz Forbes Design Engineer Project Communication Specialist Dallas will work closely Liz will oversee all public with Roberta to perform engagement on the project technical modeling and including public meetings develop preliminary flood and outreach. improvement concepts. Liz is a senior project communication Dallas is a water resources graduate engineer who specialist for the planning and urban began his career in 2019. He is involved in water design work group. She is responsible for developing resources design and construction, assisting in modeling, and leading public outreach efforts for planning, hydrologic analysis, storm sewer design, stormwater landscape architecture, and transportation projects. plans, and reviewing development plans. Dallas has Liz began her career in 2001 and is experienced in previous experience designing water and wastewater planning communication strategies, developing text and conveyance and collection systems. He enjoys working graphics for outreach materials, terrestrial and aquatic through designs and other project aspects to find the best invasive species management, and surface water quality possible solution for each scenario. Dallas utilizes his protection. She enjoys being involved in a variety of technical modeling expertise to develop effective flood projects where she can partake in outreach and education. solutions. His technical abilities include HEC-RAS floodplain modeling, assessment of FEMA floodplain regulation, and submittal of critical FEMA documents.

Eric Wilfahrt, L.S. Survey Manager Eric will provide survey oversight and guide field crews to collect all information necessary for preliminary design. Eric likes to complete projects that have complex and challenging right-of-way and boundary determinations. He is a project surveyor who manages survey operations for the firm’s south metro locations. He began his surveying career in 2004. He is responsible for researching, preparing, calculating, interpreting, and writing legal descriptions related to ALTA, topographic, plats, boundary, and engineering surveys. He has additional quality control and oversight duties. Eric is proficient in AutoCAD, AutoCAD Map, COGO, CG-Survey for AutoCAD, Eagle Point Software, Civil 3D, Trimble Business Center, Leica Cyclone 9, and Leica Topo II Software.

Downtown Flood Improvement Study | City of Northfield, Minnesota Timothy J. Olson, P.E., CFM Water Resources Engineer

Education Summary Master of Science - Civil Engineering, Water Resources Tim has been a water resources engineer with Bolton & Menk since 2006. South Dakota School of Mines & Technology His experience includes project management in both design and construction of complex water resources and environmentally sensitive projects. He Bachelor of Science - Civil Engineering, Water Resources specializes in comprehensive surface water management planning; innovative South Dakota School of Mines & Technology best management practice design; detailed hydraulic and hydrologic modeling; drainage design and construction plan review; NPDES Phase I & II MS4 and Registration construction stormwater permitting requirements; and coupling GIS techniques Professional Engineer, Minnesota, Iowa, North Dakota, with water resources design and analysis. Tim has a passion for stormwater Wisconsin and water quality education and participates in several stormwater-related steering committees and stakeholder groups. He enjoys facilitating partnerships, Certifications developing new relationships, and collaborating with stakeholders to define a FEMA Certified Floodplain Manager common vision and work toward shared goals. Organizations Experience Stormwater Managements Plans (SWMP) Minnesota Society of Professional Engineers • Regional Hydraulic Modeling and SWMP Report, City of Northfield, MN • Spring Creek Subwatershed Assessment, City of Northfield, MN • SWMP Update, Regional Hydraulic Modeling, City of Forest Lake, MN • SWMP Update, Watershed Coordination, City of Brooklyn Center, MN • SWMP Update, City of Scandia, MN • SWMP Update and Watershed Review, City of Marine on St. Croix, MN • SWMP, Shakopee Mdewakanton Sioux Community • Citywide Hydraulic and Hydrologic Modeling, Comprehensive Report Preparation, and Detailed ArcGIS Analysis, Cities of Paynesville, Mankato, Saint Francis, Wells, Jordan, and Ramsey, MN Floodplain Analysis, Mapping and FEMA Coordination • Sand Creek Flood Analysis and Remapping, City of Jordan, MN • Turtle Creek Flood Mitigation, City of Austin, MN • Meeker County DFIRM, Meeker County, MN • Count Ditch 12 Flood Mitigation, City of Worthington, MN • Sunset Pond Dam Safety Analysis, City of Burnsville, MN • FEMA DFIRM Study, Lake Crystal, MN • Iowa River Floodplain Assessment, Flood Mitigation and Interior Drainage Improvements, City of Belmond, IA • Winsted Lake Floodplain Assessment, LOMR and LOMAs, City of Winsted, IA • Major Streams, Floodplain Delineation, and ArcGIS Analysis, Flood Insurance Studies, Document Preparation, and Preparation of Technical Support Data Notebook (TSDN), Numerous Counties in Minnesota Brian J. Hilgardner, P.E. Principal Engineer

Education Summary Bachelor of Science - Civil Engineering When it comes to clients, Brian takes time to get to know them on a deeper University of Minnesota level, building trust in him and the Bolton & Menk team. Since beginning his career in 1998, he has gained a range of experience in project administration Registration from conception through construction. His background as a project manager Professional Engineer, Minnesota includes development and design of municipal reconstruction projects, with expertise in pedestrian facility construction and street construction. Over Certifications the years, Brian has fostered strong relationships with both his clients and MnDOT Certifications employees. He is passionate about mentoring and helping train young EIT’s on •• Aggregate Production proper construction observation skills and career development.

U of M Certifications Experience •• SWPPP Design City of Northfield, Minnesota •• Woodley Street Improvements Organizations •• Maple and Prairie Street Reclaim Minnesota Society of Professional Engineers •• 6th and 9th Street Reconstruction •• 2012 Street Reconstruction National Society of Professional Engineers •• Linden, 2nd, and Plum Street Reconstruction •• 4th Street Improvements North American Society for Trenchless Technology •• 1st Street Improvements •• Water Street Parking/5th Street Enhancements and Reconstruction Minnesota Public Works Association •• Municipal State Aid Improvements •• 5th Street Improvements City Engineers Association of Minnesota Roberta R. Cronquist, P.E., CFM Water Resources Project Manager

Education Summary Master of Science - Civil Engineering Roberta is a water resources project manager for Bolton & Menk, beginning her San Diego State University career in 1998. She is experienced in water resource engineering, stormwater management, and stormwater infrastructure design and construction. She is also Bachelor of Science - Civil Engineering experienced in project design, project management, and working with a team of San Diego State University design engineers, consultants, and resource agencies to develop comprehensive projects. Registration Professional Engineer, Minnesota, Iowa, North Dakota, Roberta is experienced with hydrologic and hydraulic modeling to support California, Colorado transportation projects, regional drainage improvement projects, and bridge hydraulic design, as well as river engineering, sediment transport modeling, and 2-dimensional Certifications flood modeling. She has processed numerous projects with the Federal Emergency FEMA Certified Floodplain Manager Management Agency (FEMA) as well as the Army Corps of Engineers.

Organizations Roberta has extensive experience in stormwater modeling using HEC-RAS and Association of State Floodplain Managers HECGeoRAS, Fluvial-12 sediment transport modeling, and integrating the use of GIS to develop regional comprehensive drainage plans. She has additional Minnesota Association of Floodplain Managers experience in the use of Microstation, GeoPack, XPSWMM, and Autodesk Storm and Sanitary Analysis. Experience Drainage Improvement Projects • Waterville Cannon River Flood Study, City of Waterville, MN • Cedar River Floodplain Study, CSAH 13, Anoka County, MN • Eagle Creek Culvert Improvements, City of Eagle Bend, MN • Sweetwater Road/CSAH 12 Drainage Improvements, Washington County, MN • Turtle Creek Flood Study & Levee Design, City of Austin, MN • Okabena Creek (CD 12) Flood Mitigation Study, City of Worthington, MN • Railroad Creek Hydraulic Analysis and Bridge Replacement, City of Cherokee, IA • Hawk Creek Bank Stabilization, Renville County, MN • Jordan Creek Restoration and Erosion Repair, City of West Des Moines, IA • Lake Waconia Outlet & Waconia Parkway Culvert Replacement, City of Waconia, MN • CSAH 75 Bridge Erosion Study, Washington County, MN • Minnesota River 169 Bendway Weir Design, Mankato to Saint Peter, MN • Looney Creek, Gilmer Bridge Replacement, Houston County, MN • MSU Mankato Regional Drainage Modeling, City of Mankato, MN • Mapes Creek LOMR, City of Watertown, MN • Zumbro Slough Hydraulic Study (CSAH 60), City of Wabasha, MN • Bear Creek, Chester Woods Trail Design, City of Rochester, MN • St. Clair WWTP Levee, Le Sueur River, City of St. Clair, MN • Center Creek, I-90 Trail Bridge Design, City of Fairmont, MN • Orno Storm Water Management Plan Regional Drainage Model, City of Orno, MN • 6th Street Regional Drainage Improvements, City of Wells MN Dallas M. Jones, CFM, EIT Water Resources Design Engineer

Education Summary Bachelor of Science - Environmental Engineering Dallas is a water resources graduate engineer who began his career in 2019. He University of Wisconsin - Platteville is involved in water resources design and construction, assisting in modeling, hydrologic analysis, storm sewer design, stormwater plans, and reviewing Registration development plans. Dallas has previous experience designing water and Engineer-in-Training wastewater conveyance and collection systems. He enjoys working through designs and other project aspects to find the best possible solution for each Certifications scenario. FEMA Certified Floodplain Manager Experience Erosion Stormwater Management Certifications • HCCRA Culvert BLUFF_25 Assessment and Design, Hennepin County, • Construction Site Management MN • Design of Construction SWPPP • Doyle Estes Elk Vale Creek Flood Assessment and FEMA Documentation, City of Rapid City, SD • Sand Creek Flood Assessment and Mitigation Design, City of Jordan, MN • Norway Lake Rock Dam Study and Design, City of Pine River, MN • Coon Rapids Dam Regional Park Stormwater Management, Three Rivers Park District, MN • Stormwater Master Plan, City of Hankinson, ND • Downtown Stormwater Assessment, City of Forest Lake, MN • County Road D and Greenbrier Stormwater Management Design, City of Little Canada, MN • Federal Path and Storm Sewer Improvements, City of Willmar, MN Eric R. Wilfahrt, L.S. Survey Manager

Education Summary Bachelor of Science - Land Surveying Eric likes to complete projects that have complex and challenging right-of-way St. Cloud State University and boundary determinations. He is a project surveyor who manages survey operations for the firm’s south metro locations. He began his surveying career in Associate of Applied Science - Land Surveying Technology 2004. He is responsible for researching, preparing, calculating, interpreting, and South Central College writing legal descriptions related to ALTA, topographic, plats, boundary, and engineering surveys. He has additional quality control and oversight duties. Eric Associate of Applied Science - Civil Engineering Technology is proficient in AutoCAD, AutoCAD Map, COGO, CG-Survey for AutoCAD, South Central College Eagle Point Software, Civil 3D, Trimble Business Center, Leica Cyclone 9, and Leica Topo II Software. Registration Licensed Land Surveyor, Minnesota Experience City of Northfield, Minnesota Organizations • Spring Creek Road Drainage Study Minnesota Society of Professional Surveyors • Golf Course and Parmeadow Pond Dredging • Comprehensive Stormwater Modeling Low Elevations Survey National Society of Professional Surveyors • Floodwall Survey Elizabeth A. Forbes Senior Project Communication Specialist

Education Summary Master of Science - Natural Resources with an Liz began her communication career in 2001. Her public relations experience Emphasis in Communications spans multiple disciplines, working with many different teams. She is constantly University of Idaho, Moscow improving the effectiveness of communication while bringing a voice to all stakeholders on every project she touches. Liz creates right-sized, effective Bachelor of Science - Natural Resources outreach plans, crafts excellent materials that clearly communicate different Southern Illinois University, Carbondale topics or ideas, and organizes on-point engagement. She enjoys being involved in a variety of projects where she can partake in outreach and education. Certifications Certified Arborist - International Society of Experience Arboriculture Corridor Studies, Transportation Plans, and Comprehensive Plans • Arboretum Area Transportation Study, Carver County, MN • CSAH 10 Corridor Study, Carver County, MN • Warren Street Corridor Study, Mankato/North Mankato Area Planning Organization • Zoning Code Rewrite and Redevelopment, City of Brooklyn Center, MN

Construction Projects • Highway 10/169 Improvements, City of Anoka, MN • TH 10 Ramsey Gateway, City of Ramsey, MN • CSAH 33 at 140th Street Roundabout, Dakota County, MN • TH 47 St. Francis Boulevard Corridor Improvements, City of Anoka, MN • Lake Avenue Improvements, City of Fairmont, MN

Communication Specific Projects • Public Engagement Plan for Emerald Ash Borer Management, City of Burnsville, MN • Surface Water Quality Education Plan for ISD 191, City of Burnsville, MN • Citizen Science Water Quality Monitoring Program, City of Burnsville, MN • Communication Plan for Natural Resources, City of Burnsville, MN • Interpretive Exhibit Plan for Brown’s Creek State Trail, Minnesota Department of Natural Resources • Interpretive Sign Project for Beaver Dam, Arkansas, U.S. Army Corps of Engineers • Exhibit Plan for Burr Oak Woods Nature Center, Missouri Department of Conservation • Exhibit Plan for Powder Valley Nature Center, Missouri Department of Conservation REFERENCES Section 4 References 23

REFERENCES

Past performance serves as a great indicator of future performance. Our clients tell us we are doing a great job, and they will tell you, too!

Suzanne Jiwani Tom Nikunen Steven Lang, P.E. Floodplain Mapping Hydrologist, MnDNR City Administrator, City of Jordan Public Works Director, City of Austin 500 Lafayette Road 210 East First Street 500 4th Avenue NE St. Paul, MN 55155 Jordan, MN 55352 Austin, MN 55912 651-259-5681 952-492-2535 507-437-9950 [email protected] [email protected] [email protected]

Downtown Flood Improvement Study | City of Northfield, Minnesota COST PROPOSAL Section 5 Cost Proposal 24

COST PROPOSAL The following tables summarize the hours and cost breakdown for each major work task item. The estimated fee includes labor, general business, and other normal and customary expenses associated with operating a professional business. Unless otherwise noted, the fees include vehicle and personal expenses, mileage, telephone, survey stakes, and routine expendable supplies; no separate charges will be made for these activities and materials. Expenses beyond the agreed scope of services and non-routine expenses, such as large quantities of prints, extra report copies, out-sourced graphics and photographic reproductions, document recording fees, outside professional and technical assistance, and other items of this general nature will be invoiced separately. Estimated Hours

Client: City of Northfield Bolton & Menk, Inc. Project: Downtown Flood Improvement Study

Totals Engineer Specialist Lead Floodplain Floodplain Lead Communication Design Engineer Survey Manager Survey Project Manager Project

Task No. Work Task Description Principal-in-Charge A Data Gathering A.1 Conduct Kickoff Meeting 2 2 2 6 A.2A Complete Field Survey 80 80 A.2B Optional Bathymetric and Bridge Survey 70 70 A.3 Gather As-Built and GIS Data 2 2 A.4 Present to City Council 4 4 2 10 A.5 Facilitate Public Meeting 6 6 2 30 44 Subtotal Hours - Task 1 12 2 12 6 150 30 212 B Evaluate Flood Mitigation Solutions B.1A Review Cannon River Hydraulics 2 6 8 B.1B Update Existing Conditions Model 10 40 50 B.2 Review Flood Solutions 8 40 120 168 B.3 Prepare Cost Estimates and Summary Report 8 34 64 106 B.4 Develop Operation and Maintenance Costs 4 16 12 32 B.5 Map the Flood Extents for the Proposed Solutions 4 8 40 52 Subtotal Hours - Task 2 24 0 110 282 0 0 416

Total Hours 36 2 122 288 150 30 628 Average Hourly Rate $149.00 $177.00 $165.00 $114.00 $164.00 $85.00 Subtotal $5,364 $354 $20,130 $32,832 $24,600 $2,550

Total Fee $85,830 Total Fee Without Optional Task A.2B and B.1B $68,140

Project Name Downtown Flood Improvement Study | City of Northfield, Minnesota City of XXX, Minnesota Section X - Page X