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Home My WebLink About9.a. Authorize Development of Well 16, City Project 416 ROSEtv1OUNT EXECUTIVE SUMMARY CITY COUNCIL City Council Meeting: October 1, 2013 AGENDA ITEM: Authorize Development of Well 16, City AGENDA SECTION: Project 416 New Business PREPARED BY: Andrew J. Brotzler, PE, Director of Public AGENDA NO. I (I Works/City Engineer ATTACHMENTS: Location Map, Bella Vista Preliminary APPROVED BY: Plat VA) - RECOMMENDED ACTION: Motion to authorize the development of Well 16, City Project 416 ISSUE Staff is recommending Council authorization to begin the development of Well 16, City Project 416. With the increase in development over the past several years, the planning and development of Well 16 is necessary to support continued development. BACKGROUND At the Utility Commission meeting September 9, 2013, the Commission authorized the development of Well 16. • Following the completion of Well 15, a summary of available water supply capacity for growth and development was prepared. • Based on the additional units and development plans approved since Well 15, the water supply system can support an additional 400 to 600 units of development, based on peak demands. • The planned construction of the splash pad will utilize the equivalent of 250 to 300 units of the remaining capacity for the operation of the splash pad. • Based on a minimum lead time of 2 years to develop and construct a well and well house,it is recommended to consider the development of Well 16 at this time. • From preliminary discussions with the Minnesota Department of Natural Resources (permitting agency for groundwater appropriation), indications are that permits will continued to be considered at this time for improvements consistent with local water supply plans. With current regional discussions surrounding water supply challenges, the certainty of obtaining approval for well construction in the future is less clear. • Total estimated project cost is $1,450,000. • The project cost will be funded by the City's Water Core Fund. Based on the balance of the Water Core Fund, revenue bonds will likely need to be issued to fund the project cost. C:\Users\ddj\AppData\Local\Microsoft\windows\Temporary Internet Files\Content.Outlook\3N3RC8DD\20131001 CC Authorize Development of Well 16.docx Well 16 is planned to be located on property within the recently-approved Bella Vista development as shown on the attached map. This location is consistent with the city's water supply plan and well field study. The scope and schedule for the development of Well 16 is outlined below. Development of Well 16 will include the following phases: 1. Design and construct a monitoring well near the center of the city in accordance with the DNR's requirements identified in the city's appropriations permit. 2. Design and construct a test well at the well 16 site to confirm geology and water quality data that will aid in the design phase. 3. Design and Construct Well 16. a. Assumed that on-site contamination is not present. b. Assumed that geological conditions are consistent with previous well sites. c. Test pumping of the well for a maximum of 24 hours. 4. Design and Construct a pumping facility for Well 16. a. Well House 16 will replicate Well House 15. The DNR is requiring that the City install 3 monitoring wells in the Jordan formation. Two of the three monitoring wells in the Jordan formation requested by DNR in the appropriation permit have been installed. The City has been using Minnesota Department of Health (MDH) grants or combining the monitoring wells with other projects to fund the DNR's request and has therefore spread the work out over time to lessen the impact on the City's finances. The monitoring wells are as follows: 1. Test Well 14 at Well House 14 has been converted to a monitoring well. A data logger was installed and the city will be submitting data in the near future. 2. A monitoring well was installed at UMore Park along with the installation of an irrigation well project. That project was completed in spring 2013. A data logger has been installed and the City will be submitting data in the near future. 3. The 3`d monitoring well requested by the DNR will be installed this fall/winter near the center of the City as requested by the DNR. q Y The city has applied for a grant from the MDH to investigate the condition of abandoned wells 1 and 2. It is known that they were capped,but it is unclear whether they were ever sealed. If former wells 1 or 2 have not been sealed,the possibility of using one of the wells as the 3rd monitoring well will be assessed. Schedule and Estimated Fee The preliminary schedule for all phases is as follows: Phase 1 —Monitoring well (Estimated Fee of$8,000) • Assess the condition of Wells 1 &2 October 2013 3 • Prepare quote documents for converting well 1 or 2 or constructing a separate monitoring well October 2013 • Submit design to DNR for approval October-November 2013 • Obtain quotes and award contract November-December 2013 • Construct monitoring well January 2014 • Install data logger Spring 2014 • Obtain data and submit to the DNR Spring 2014 Phase 2—Test Well (Estimated Fee of$8,000) • Design test well October 2013 • Obtain quotes and award contract October-November 2013 • Construct test well November-December 2013 • Obtain geological and water quality data December 2013 Phase 3—Well 16 (Estimated Fee of$40,000) • Submit p �Y well application ll lication to the DNR October 2013 • Design well November 2013—January 2014 • MDH/DNR review of plans &specs February - March 2014 • Advertise for bids and award contract March—April 2014 • Construct well May—September 2014 Phase 4—Well House 16 (Estimated Fee of$150,000) • Preliminary Design well house April 2014 • Prepare plans and specifications May—June 2014 • MDH review of plans & specs July—August 2014 • Advertise for bids and award contract September 2014 • Construct well house October 2014—Spring 2015 SUMMARY Due to the lead time and permitting process associated with the development of a well,it is recommended that the City Council authorize the development of Well 16. As an option to proceeding with the development of Well 16 at this time, Staff can continue to monitor the rate of development and utilization of available capacity. At a point in time in the future,increased restrictions on water usage,particularly for watering and irrigation in the form of watering bans could be considered to address peak demand periods that exceed the capacity of the water supply system. Additionally,during the review and preparation of this item comparative information was obtained from the City of Inver Grove Heights. While Inver Grove Heights does have a larger population than Rosemount,based on a comparable number of service connections it appears that a larger percentage of Inver Grove Heights population is rural residential. 4 Inver Grove Heights Data • 7,377 water service connections • 7 wells (6 primarily used) • Production capacity of 12.5 MGD • 10 MG of storage Rosemount Data • 7,464 water service connections • 6 wells • Production capacity of 8.9 MGD • 3.0 MG of storage The rural wells and east side tower are not included in the above information as the east side system is not able to provide service to the western developing area of the city. From the above information,it appears that Inver Grove Heights is addressing its peak day demands with storage capacity. 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