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HomeMy WebLinkAbout03/12/2019 Study Session Summary MinutesA� -C---O MARANA AZ ESTABLISHED 1977 MARANA TOWN COUNCIL STUDY SESSION 11555 W. Civic Center Drive, Marana, Arizona 85653 Council Chambers, March 12, 2019, at or after 6:00 PM Ed Honea, Mayor Jon Post, Vice Mayor David Bowen, Council Member Patti Comerford, Council Member Herb Kai, Council Member John Officer, Council Member Roxanne Ziegler, Council Member SUMMARY MINUTES CALL TO ORDER AND ROLL CALL Mayor Honea called the meeting to order at 6:02 PM, and directed the Town Clerk to call the Roll. Mayor Honea, Vice Mayor Post, and Council Members Bowen, Comerford, Kai, Officer and Ziegler. A quorum of the Council was present. PLEDGE OF ALLEGIANCE/INVOCATION/MOMENT OF SILENCE Mayor Honea led the Pledge of Allegiance followed by a moment silence. APPROVAL OF AGENDA Council Member Ziegler moved to approve the agenda as presented, and Vice Mayor Post seconded the motion. Motion passed unanimously: 7-0. DISCUSSION/DIRECTION/POSSIBLE ACTION March 12, 2019 Study Session Meeting Summary Minutes 1 D1 Presentation: Relating to Floodplain Management; a presentation on the findings from the first phase of the Town's Northwest drainage study (Keith Brann) Keith Brann, Town Engineer presented the first phase of the study which was to research and builds a hydrologic and hydraulic floodplain model. The next phase of the study will take various proposed infrastructure improvements and determine how they impact the model and floodplain. Highlights of the PowerPoint Presentation is provided below and is available for viewing in the Clerk's Office. (CMG Drainage/Clint Glass in attendance). Purpose and Goals of the Study • FY19 CIP Project • Detailed hydraulic study of NW Marana o Better existing conditions of data o Better understanding of flow patterns • Verify effectiveness of contemplated major infrastructure • Determine if there are minor but effective projects Phase 1 - Existing Conditions • Early FY19 - Data gathering o Review history of drainage problems o Verify existing drainage infrastructure o Pickup surveys of key infrastructure o Review newer local drainage studies ■ "East" model starts with 2009 FEMA Mapping Model ■ Modified for non -regional storm event ■ 20ft Grid west of CAP canal and north of Moore Road • Time-lapse of flood event is shown. Looking for "low - hanging fruit" -- projects that can be done without substantial funding. • 1st Half FY19 - Building computer models o New "West" model o Non -regional storm event • 20ft Grid North of Twin Peaks Road • Original results from 2009 Tortolita Alluvial Fan Study o Review of the mapping area • Northwest Marana Drainage - East side o Review of mapping area • Northwest Marana Drainage - West side o Review of mapping area • 48 Hour Time Lapse March 12, 2019 Study Session Meeting Summary Minutes 2 o Marana Master Drainage Plan (East FLO-2D): Flow Depth o Review of mapping area "East" model is north of the river; "West" model is south of the river. West model is new; East model is an update of the earlier model done to fight with FEMA in 2009. Grids in the 2-dimensional model from 2009 was at 100 sf. New model uses 20 sf grids -- much more detailed. Phase 2 - Alternatives Analysis • Review and model major flood control infrastructure previously contemplated o Barnett Channel o Marana Road Channel o Hardin Road Channel o Pinal County Line Channel • Model CAP canal near airport for breach scenario/ potential LOMR • Review and model minor problem areas as directed, possible areas include: o Marana Main Street o Various dip crossings o Veteran's cemetery area Barnett Channel - modeled as previously designed • No significant improvements in regional flooding Barnett Channel - With CAP interception • Significant Regional Improvements • Floodplain reduced to Kirby Hughes Road Barnett Channel appears not to help us much unless we extend it to the CAP overshoots, in which case it dries up everything as far as Kirby Hughes Road. Marana Channel • No significant improvement in regional flooding • Significant benefit to localized flooding A Marana Road channel will only help in the immediate area of the Marana interchange. Harden Channel • Significant Regional Improvements • Floodplain reduced north of Hardin Road March 12, 2019 Study Session Meeting; Summary Minutes 3 A Hardin Road channel appears to help all the way to the Veteran's cemetery, but there's no river outlet for it, so it would end up sheeting back overland. Marana Airport - Without Embankments • CAP and Twin Peaks Road embankments removed from model Marana Airport - Breach Scenario 1 • Twin Peaks Road embankment in place • CAP embankment modeled with 100ft breach Marana Airport - Breach Scenario 2 • Twin Peaks Rd and CAP embankments modeled with 100ft breach For the west model, Avra Valley Road removes most flooding north of it. Happy with what the models have shown. Next Steps • Incorporate stakeholder input • Complete drainage model runs • Prepare 15%DCR level designs and cost estimates for certain projects • Finalize master study findings • Identify potential benefit areas • Explore funding alternatives • Supplemental Services to be considered o Detailed design o Letter of Map Revisions Mr. Brann stated a stakeholder meeting was held on February 26 with large land owners. The Town is still getting feedback from that meeting. Will eventually move to DCR and possible future CIP projects. Mayor Honea stated Barnett was going to be a linear park; costs make it not realistic. He asked whether the Town is now looking only at it as a drainage feature. Mr. Brann replied it would be more drainage -centric. Idea was for Barnett Road to be taken out of service and making the channel 200 feet wide. Now, with utility relocation expense considerations, we're looking to keep the road in service and just using the rest as a drainage conveyance. Council Member Kai stated the Town need to prioritize the projects. No projects at the airport -- leave projects over there on the back burner. Concentrate on Barnett channel and flooding in the north area. March 12, 2019 Study Session Meeting Summary Minutes 4 Council Member Bowen asked whether Barnett needs to be connected in order to work. Mr. Brann stated it does to the CAP overshoots. It does have secondary benefits, allowing adjacent development to drain to it. Vice Mayor Post commented there are a couple of CAP overshoots that are close together, asking whether that water can be routed to the Barnett channel. Mr. Brann stated it might not be enough elevation fall to accomplish that, but staff will look into it. D2 Presentation: Relating to Water; update on the status of Major Water Infrastructure Projects (John Kmiec) John Kmiec, Water Director provided a PowerPoint presentation on Critic Projects related to Water and Water Infrastructure Reclamation. He reported on the following efforts: prepare for growth; plan to have redundancy and water treatment campuses update. Highlights of the PowerPoint Presentation is provided below and is available for viewing in the Clerk's Office. Critical Projects • Picture Rocks and Airline/ Lambert Water Treatment Campuses • Northwest Recharge, Recovery and Delivery System (NWRRDS) • Twin Peaks -Continental Reserve Interconnect • W+ to X -Zone Booster Station and PRV • Future Water and Sewer Crossing Near Tangerine/ I-10 Airline/ Lambert and Picture Rocks Water Treatment Campuses • $15M loan approved by WIFA in December, closed on loan in January • Carollo Engineers started design in January • Bench scale media testing in progress • CMAR SOQs received March 7 • Website being updated with sample results and monthly progress reports Airline/Lambert and Picture Rocks Water Treatment Campuses • Review of timeline UV-H2O2 +GAC Simplified Process Flow Schematic • Review of the schematic Picture Rocks Water Treatment Layout • Review of Continental Reserve Site Conceptual Layout Anion Exchange + LPHO UV-H2O2 + GAC Quenching Airline/ Lambert Water Treatment Layout March 12, 2019.Study Session Meeting Summary Minutes 5 • Review of Saguaro Bloom Site Conceptual Layout Anion Exchange + LPHO UV- H2O2 + GAC Quenching Airline/ Lambert Picture Rocks Water Treatment Campuses • Ion Exchange + UV-H2O2 + GAC Quenching Capital Investment o Picture Rocks/ Continental Reserve $5.7M o Airline-Lambert/Saguaro Bloom $4.3M o Price escalation, future capacity sizing contingency, etc. $2.0-5.OM ■ Total $12.0-15M Mayor Honea asked whether the filtration plants designed to handle more capacity, or just these particular wells, as he is concerned about redundancy. Mr. Kmiec replied stating staff has been working with the engineers to come up with a maximum design criteria, to not only meet current customer demands, but also additional supply interconnections. The Town does not want to build them too big, but big enough to handle future needs. Council Member Ziegler commented on price escalation, future site capacity sizing asking what is likely to escalate price (referring to equipment purchase), as she views price escalation and contingency as one -in -the -same. Mr. Kmiec stated a lot of the numbers presented were completed in the 2017 study. Some of this is related to those numbers, and Marana is not alone in dealing with these advance treatment process issues. When the Town begins to select equipment for purchase, we may not know what the price escalation may be as it is a supply and demand scenario with UV lamps, in particular, with getting those vessels delivered to the Town of Marana that are also being purchased by other communities could increase these costs. Council Member Ziegler questioned the scope of work asking whether there is any risk in it as was explained earlier being vetted out. Mr. Kmiec replied stating the approach as outlined is tried and true, and is similar to the City of Tucson in how certain compounds are being handled. Northwest Recharge, Recovery and Delivery System (NWRRDS) • 2,400 AF per year (2.2 MGD) of recovered CAP water directly in to the system (wet water) for Marana • Expanded utilization of existing wells/ system • Creates system redundancy for current customers; provides water for growth areas of Hartman Vistas and Picture Rocks Water Systems, and the Twin Peaks corridor. Rt-nk-f1tA • Reduce groundwater pumping in eastern Marana • Cost sharing with Metro Water and Town of Oro Valley • Provides access to Arizona Water Bank water in times of CAP shortage March 12, 2019 Study Session Meeting Summary Minutes 6 Mr. Kmiec stated substantial CAP water resources have been banked in the town and around the airport at two facilities. This project puts that wet water to actual use. This project as a maximum design capacity of 10,000 sf. If other agencies use less, other agencies can take advantage of the available capacity. Helps remedy an area where the groundwater situation is poor. This would be cost -prohibitive on our own. Arizona Water Bank has also been storing significant water in this area. We can use that water in times of shortage. One of the reasons we got $550K from CAP/CAWCD was to allow us to use that water in times of shortage. Council Member Kai asked whether the Town can tap the Arizona Water Banking Authority (AWBA) to help with this NW Recovery project, or are they just providing the water resource. He asked whether AWBA would assist in paying for those cost. Mr. Kmiec replied stating the recovery plan has not been fully vetted. That is one of the reasons the reliability money was released to us. Mayor Honea asked whether the Arizona Water Bank water is being pumped from the canal into the recharge basin in this area. Mr. Kmiec affirmed. Mayor Honea asked whether they can send it the other way. Mr. Kmiec stated he has not heard of that happening. Mayor Honea asked whether OV recharging water is in those basins. Mr. Kmiec replied yes, 4000 sf/ yr. for the past 10+ years. They have over 25000 sf in the area. Metro has over 45000 sf in this area. This project will allow OV to reduce its reliance on wheeling with the City of Tucson. Still looking at design issues. Source water map shows separate Marana and CAP recovery pipelines, to be tied together at the east side of the airport just west of the CAP canal on the north side of Avra Valley road. Town will need to extend a line from the existing airport system to the connection point. Northwest Recharge, Recovery and Delivery System (NWRRDS) • Review of timeline schedule Northwest Recharge, Recovery and Delivery System (NWRRDS) • Marana Connection Booster Station Marana Water Systems • Review of mapping area Continental Reserve Interconnect • Review of proposed pipeline • Continental Reserve Reservoir and Booster Station • Design in Progress: 6,200 LF 24"Pipe, —$1.7M Mr. Kmiec provided an overview of disconnected water systems. Continental Reserve interconnect connects the Continental Reserve reservoir and booster station to connect March 12, 2019 Study Session Meeting Summary Minutes 7 to the Hartman Vistas area, allowing water to go both ways. Allows flexibility and redundancy in case of a loss of wells. This will allow NWRRDS to benefit the entire Hartman Vistas and Continental Reserve areas. W+ to X Zone Booster and PRV Station • Review of mapping area of existing water line • Design in Progress: $935,000 total budget W to X zone booster in Tangerine Farms Road. This has been on their radar for several years as the design in process. Ventana Medical Systems is barely able to meet its fire flow requirement. What is necessary for this area is to have a booster station and pressure reducing valve assembly to be able to add some relief to the corridor, the Tangerine Road Interchange, and to provide higher pressure to commercial development along Tangerine. If someone else comes in near Ventana, we will need this to be in place as the Town would not be able to serve them. The booster station is currently in design as the Town would like to have this completed so to be able to provide service in that area. Future Tangerine/I-10 Crossing • Review of mapping areas: Existing Sewer, Existing Water and Proposed Water Mr. Kmiec commented on growth on the east side Tangerine. They do not have a project as it was not projected in the Town's 10 Year Infrastructure Improvement Plan. However, there has been many conversations in determining how to get water up into the Tangerine Road area. A future project (not in our 10 -year plan) would interconnect from the Tangerine interchange to the Tangerine Business Park, which will allow gravity service of the Tangerine interchange area. With future ASLD development on Tangerine Road, an interconnection could occur with the Hartman Vistas system. Mayor Honea stated most redundancy lines will flow either way. Mr. Kmiec affirmed stating, ideally the Town will be able to move water up and down the zones, but most often you want it to be delivered by gravity from the higher elevation area to the lower. Mayor Honea stated water quality is also a concern; the Town will be able to move water around if we run into an issue. Mr. Kmiec stated yes, as that is exactly what we were missing last year --we did not have the ability to shut off wells and move water around. Mayor Honea asked whether the Town will have enough storage capacity. Mr. Kmiec stated developers will need to build more reservoirs throughout the system. Mr. Mehta stated absent in this presentation, but does need to be addressed are the likely costs. For drainage, it will be several months, but it will be in the many millions; March 12, 2019 Study Session Meeting Summary Minutes 8 not funded in current program. There will be additional financial needs for what Council determine is critical needs. EXECUTIVE SESSIONS Pursuant to A.R.S. § 38-431.03, the Town Council may vote to go into executive session, which will not be open to the public, to discuss certain matters. E1 Executive Session pursuant to A.R.S. §38-431.03 (A), Council may ask for discussion or consideration, or consultation with designated Town representatives, or consultation for legal advice with the Town Attorney, concerning any matter listed on this agenda for any of the reasons listed in A.R.S. §38-431.03 (A). FUTURE AGENDA ITEMS Notwithstanding the mayor's discretion regarding the items to be placed on the agenda, if three or more Council members request that an item be placed on the agenda, it must be placed on the agenda for the second regular Town Council meeting after the date of the request, pursuant to Marana Town Code Section 2-4-2(S). ADJOURNMENT Vice Mayor Post moved to adjourn the meeting, and Council Member Kai seconded the motion. Meeting adjourned at 7.02 PM. Motion passed unanimously, 7-0. CERTIFICATION I hereby certify that the foregoing are the true and correct minutes for the Study Session Meeting of the Marana Town Council meeting held on March 12, 2019. I further certify that a quorum -Was present. Cherry L. awson, Town Clerk March 12, 2019 Study Session Meeting Summary Minutes ARANA AZ F''l AB i_l SNigD 19'77