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1995 Water Supply Distribution Plan with notesCJ Y - i ►'l of n Cam. 5 F r "r) Se- 0-) a) O_r hi '�) U�r44t, to ills November 9, 2004 City of Cottage Grove Public Works Department 8635 Point Douglas Road Cottage Grove, MN 55016 Attn: Ms. Jennifer Levitt Re: Water Supply and Distribution Plan Update Dear Jennifer: c As requested, we have put together a work plan to update the 1995 Water Supply and Distribution Plan. This letter outlines the major issues and provides a work plan to update the plan; "Were appropriate, we have listed work that City staff could perform. ❑ Major Issues There are three major issues for the Water Supply and Distribution Plan to evaluate: growth, phasing, and financing of proposed improvements. Growth: The basic purpose of the Water Supply and Distribution Plan Update is to provide a guide to orderly expansion of the trunk water system to handle the projected growth of the City. Changes in the development patterns and land use have reduced the projected 2020 and ultimate population from the estimates in the P 1995 plan. The East Ravine Community Pre - design Study has looked at land use and development phasing for the east ravine area. We will build on that plan, and look at the impact of growth throughout the City limits. • Phasing: The East Ravine Community Pre - design Study is evaluating phasing of development for the East Ravine. We will use this phasing plan, as well as current City planning for the remainder of the City to prepare a water system capital improvement plan for the entire City. Additionally, we will identify key "trigge for implementing water system improvements, so that the City can better plan when to start each facility, and update the CIP based on actual growth. • Financing of Proposed Improvements: The study will update the cost recovery system based on the latest cost estimates for the ultimate water system, and the latest estimates for future connections and developable acres. City of Cottage Grove Deco_ nbcr ! ;_'004 Page 2 { Deleted: November 9, 3004 ❑ Basic Work Plan An outline of the tasks required to update the 1995 Water Supply and Distribution Plan is presented below. We anticipate the City will prepare Land Use and water distribution system maps on their GIS system. These maps will be delivered electronically for Bonestroo use during the study. �t City staff will use the Land Use Map and GIS to calculate_population projections and the developable acres of each land use for each analysis period (2025 and Ultimate). The City will also help collect data, perform hydrant testing, and attend meetings with Bonestroo staff. Basic Work Plan tasks are outlined below. Task 1: Project Initiation and Data Collection We will review data and information collected for the 1995 Water Supply and Distribution Plan and supplement that data with information and data for facilities constructed since the 1995 Plan publication. Additionally, we will meet with Cottage Grove staff to get input on any changes, modifications, or improvements that they would like to see in the water system. Task 2: Water Usage Review and Projections We will obtain and review water use data collected since the 1995 Plan in order to establish existing and estimate future water use patterns within the City. We will establish water use at points throughout the City based on the updated land use plan. Design average day and maximum day water demands will be established for the years 2020 and the ultimate build out of the City. Maximum Fire flow requirements will be reviewed based on Insurance Services Office and City requirements. We will meet with the City (at the Project Initiation Meeting) to review the projected water demands and fire flow requirements. For this task, we anticipate that the City will. summarize water use-.(a-verage ajid maximum day—use-for-the Grove, Estates and High Zone), provide a copy of the latest ISO Report, and provide a representative from the.Fire Department "af - the meetin�g. Task 3: Wellfield Review We will review the wellfield plan to ensure it meets the needs of the City's revised ultimate water demand. This analysis will consist of estimating the number of additional wells required (based on capacity of existing wells), and estimating the location of future wells (based on results of North Well Field Study done by us last year). City of Cottage Grove Task 4: Water Treatment Evaluation We will review the existing well water quality with respect to current and proposed drinking water standards. This evaluation will include both public health concerns and aesthetic issues, such as taste, odors, and "red" or "black" water complaints. The City will provide recent water quality tests for every well. Task 5: Hydraulic Modeling The existing hydraulic model of the Cottage Grove Water System will be upgraded to a WaterCAD model. WaterCAD is a powerful analytical tool that operates in a totally integrated AutoCAD and GIS environment. The computer model can be viewed with City base maps, land use maps, or integrated into the City GIS system. By simulating operation of the water system, the computer model: • Reveals system problems, • Predicts the effects of alternative solutions, and • Predicts the effects of system expansions. Pipes constructed since the 1995 plan will be added to the model, and the model will be used to size future trunk water mains to serve development as well as address these near - term concerns: m > a v ►') �{ fN c A-0\ Q C�� ✓ Determine the need for and location of Industrial Park storage, ✓ Drive -In Theater site treatment and storage,- ✓ Determine need for water tower in the Grove area, and ✓ Size and location for connection between Pinehill Tower and the Grove Area. Task 6: Capital Improvement Planc.���� A water utility must have a sound basis for planning the expansion of its water system. This is especially true now, with increasing regulations regarding property acquisition, public notification and construction. A sound Capital Improvement Plan (CIP) will enable Cottage Grove to have the required facilities in -place by the time they are needed. The CIP will be prepared for the trunk water system. The CIP will be in one -year increments through 2010, in five -year increments through 2025, and will consider remaining improvements to be post -2025. December 1 2 004 Deleted: November 9, 2004 1 Page 3 / W If The CIP will be based on the best available projections from the City for population, land use, and water use. Additionally, the CIP will be linked to benchmark events to allow Cottage Grove to update the CIP easily. For example, wells and water towers will be tied to water use thresholds. Distribution system improvements will be linked to future development or to coincide with street reconstruction projects. Cite of Cottage Grove Task 7: Economic Analysis !>ncanih<:r17 -- -{ Deleted: November 9, 200 Page 4 The operation of a water utility must have a sound financial basis. Detailed cost estimates for all of the proposed trunk water system facilities will be prepared and presented in the report. An estimate of the land required for wells and water towers will be provided so that an estimated cost for land acquisition can be included in the cost of each facility. The City will provide land costs. These costs will be included in the CIP described above. Based on the overall cost of the ultimate water system, a fair and equitable manner of revenue generation will be developed using area and connection charges to pay for the trunk water system. We will review the City's existing charge system and make recommendation for improvements. Task 8: Report and Presentation The Bonestroo report will include graphics and figures to clarify items discussed in the report. The information in the report will be organized for ease of access by various audiences. A clear, concise Executive Summary and Recommendations section will assist the City Council and the city staff to review this document. Technical information will generally be placed in an appendix. This work consists of the following subtasks: • Draft Report for Staff Review: For several of the major tasks described above, technical memoranda will be prepared and submitted to Cottage Grove for review. Because the results of one task can affect others, technical memoranda on each task will be prepared as the task is completed. We will attend one review meeting with City staff. g A draft report for the entire study, including all applicable maps, figures, and appendices will be compiled and presented to city staff for review. Final Report: Following review by city staff, a final report will be prepared and 25 copies submitted to Cottage Grove. oe'Orc , fNe � C r, J-A c f P l a `, wl Ci 1 L,Uk- C -`e, City of Cottage Grove Deee»iher_I ?_?0Q _ D eleted: Novembe 9, 3004 1 Page S H Costs We propose to complete the Water Supply and Distribution Plan Update for a lump sum of $10,200. This cost is broken down by task in the following table. Task Cost 1. Project Initiation $500 2. Water Use Review $400 3. Well Field Review $200 4. Water Treatment Evaluation $800 5. Hydraulic Modeling $6,500 6. Capital Improvement Plan $400 7. Report $1,400 Total Water Plan Update $10,200 We look forward to discussing this proposal with you. Please call me at (651) 604 -4842 after you have had a chance to review this information. Sincerely, BONESTROO, ROSENE, ANDERLIK & ASSOCIATES, INC. Mark D. Wallis Cc: Harry Taylor, City of Cottage Grove Les Burshten, City of Cottage Grove Tom Thompson, Bonestroo