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Home My WebLink AboutPackets - Stormwater Utillity Commission (203) AGENDA STORMWATER UTILITY COMMISSION STUDY SESSION APRIL 18, 2025 FIELD LOCATIONS STUDY SESSION AT OR AFTER 7:30 AM CALL TO ORDER ROLL CALL STUDY SESSION AGENDA 1.DISCUSSION ON TOUR OF SEVERAL STORMWATER RELATED SITES THROUGHOUT THE TOWN The following locations and tentative times will be toured: 1. 7:30 am - Begin trip at 680 W Calle Concordia 2. 8:15 am - Sierra Wash @ Naranja Dr - Near Naranja Dr, 500’ E of La Cholla Blvd 3. 8:35 am - Sierra Wash @ Via Mandarina - Near Via Mandarina & N Via De La Verbenita 4. 9:00 am - Sierra Wash @ Glover Rd - Near Glover Rd & La Tanya Dr 5. 9:25 am - Naranja Park Drainage - Naranja Park 6. 10:00 am - Mutterers Wash - Near W Greenock Dr & N Oracle Rd 7. 10:30 am - Pusch View Golf Course Bridge Replacement - Pusch View Golf Course 8. 11:15 am - Lunch stop - At Overlook Restaurant 10555 N La Canada ADJOURNMENT There will be no public comment during this study session. POSTED: 4/16/25 at 5:00 pm by dt When possible, a packet of agenda materials as listed above is available for public inspection at least 24 hours prior to the Commission meeting in the Town Clerk's Office between the hours of 8:00 a.m. – 5:00 p.m. The Town of Oro Valley complies with the Americans with Disabilities Act (ADA). If any person with a disability needs any type of accommodation, please notify the Town Clerk’s Office at least five days prior to the Commission meeting at 229-4700. Stormwater Utility Commission Study Session 1. Meeting Date:04/18/2025 Requested by: Dennis Roberts, Public Works Submitted By:Yarina Hynd, Public Works SUBJECT: DISCUSSION ON TOUR OF SEVERAL STORMWATER RELATED SITES THROUGHOUT THE TOWN The following locations and tentative times will be toured: 1. 7:30 am - Begin trip at 680 W Calle Concordia 2. 8:15 am - Sierra Wash @ Naranja Dr - Near Naranja Dr, 500’ E of La Cholla Blvd 3. 8:35 am - Sierra Wash @ Via Mandarina - Near Via Mandarina & N Via De La Verbenita 4. 9:00 am - Sierra Wash @ Glover Rd - Near Glover Rd & La Tanya Dr 5. 9:25 am - Naranja Park Drainage - Naranja Park 6. 10:00 am - Mutterers Wash - Near W Greenock Dr & N Oracle Rd 7. 10:30 am - Pusch View Golf Course Bridge Replacement - Pusch View Golf Course 8. 11:15 am - Lunch stop - At Overlook Restaurant 10555 N La Canada RECOMMENDATION: N/A EXECUTIVE SUMMARY: N/A BACKGROUND OR DETAILED INFORMATION: N/A FISCAL IMPACT: N/A SUGGESTED MOTION: N/A Attachments Field Trip Sites ^_ LAMBERT TANGERINE OVERTON LINDA VISTA CALLE CONCORDIA HARDY 2025 Stormwater Utility Field Trip Stops Starting Location 680 W. Calle Concordia Legend ^_Starting Point (680 W. Calle Concordia) Field Trip Stops Location Sierra Wash at Naranja Dr. (Stop 1) Sierra Wash at Via Mandarina (Stop 2) Sierra Wash at Glover Rd. (Stop 3) Naranja Park Drainage (Stop 4) Mutterer's Wash (Stop 5) Pusch View Golf Course Bridge Replacement (Stop 6) Major Streets ¯Miles0 0.5 1 Town of Oro Valley Public Works Department Stormwater Utility Division Oro Valley, it’s in our nature. 11000 N. La Cañada Drive Oro Valley, Arizona 85737 www.orovalleyaz.gov ½ phone: (520) 229-4850 ½ fax: (520) 742-1022 Friday, April 18, 2025 Stormwater Utility Field Trip Overview Exploring Infrastructure Projects in Oro Valley Purpose of the Field Trip This year’s field trip provides an opportunity to explore various drainage facilities across the Town of Oro Valley, showcasing critical Stormwater Utility projects. These sites represent different stages of development—recently completed, under construction, and planned for future repairs. Through this visit, Commissioners will gain valuable insights into the Town’s infrastructure needs, enhancing their understanding of ongoing and upcoming stormwater projects. Site Visits Commissioners will visit several key locations throughout the Town, each demonstrating distinct stormwater management challenges and solutions. 1. Sierra Wash @ Naranja Drive (Completed: June 2023) · Located on Naranja Drive, approximately 1,400 feet east of La Cholla Boulevard. · Failure discovered in December 2017 due to erosion at the reinforced concrete box culvert (RCBC). · High-volume runoff (1,625 cfs) led to severe scour at the apron’s downstream end. · Project scope included: o Design and construction of a reinforced concrete drop structure. o Installation of a gabion mattress to mitigate erosion and ensure public safety. · Funding: $169K from Stormwater Utility Fee funds. 2. Sierra Wash @ Via Mandarina (Currently Under Construction) · Construction started March 27, with substantial completion expected by June 10. · Located near Naranja Ranch I Subdivision, with private properties bordering the site. · Key Challenges: o Downcutting of the wash exposed infrastructure. o CenturyLink fiber optic lines were not identified in initial utility surveys but were resolved without project delays. · Project includes a new concrete drop structure and gabion apron to prevent further erosion. · Funding: $210K federal share via DEMA; $70K local match. 3. Sierra Wash @ Glover Road (Future Project - Currently in Design) · Site situated along Glover Road, adjacent to the Naranja Ranch I Subdivision. · Inspection in 2020 found significant erosion at the culvert apron. · A No Public Objection Letter has been submitted to DEMA, awaiting FEMA grant approval. · Proposed improvements mirror previous projects, including reinforced concrete structures and gabion mattresses for erosion control. · Funding: Expected to follow similar grant allocation as other projects, requesting $235K from FEMA with an $80K local match. 4. Naranja Park Drainage (Completed: 2024, Future Enhancements Planned) · While the initial project was completed, some drainage design components were deferred to prioritize key infrastructure. · Stormwater Utility is collaborating with Parks & Recreation to enhance drainage infrastructure and flood mitigation. · A west-side channel experienced significant erosion during a monsoon storm, prompting recent redesign efforts. · Additional improvements remain under evaluation to ensure long-term resilience. 5. Mutter’s Wash (E. El Conquistador Way to W. Greenock Drive) (Annual Maintenance & Future Improvements Planned) · Background: o Publicly owned and maintained since acquisition in 2001. o Reconstructed in 2007 via an agreement with Pima County Regional Flood Control District. o Severe flooding in 2014 damaged adjacent townhomes, exceeding 100-year flood levels in some accounts. · Why We’re Visiting: 1. Annual pre-monsoon inspections identify vegetation overgrowth and sediment accumulation to determine necessary maintenance. 2. Mutter’s Wash Capacity/Conveyance Improvement Project is under consideration, evaluating alternative channel geometries to improve floodwater and sediment management. 6. Pusch View Golf Course Bridge Replacement (Upcoming Project) · Project Scope: o Replacement of the existing golf course bridge. o Designed to improve stormwater resilience and prevent structural degradation. · A vital infrastructure upgrade, ensuring long-term durability against storm events. Looking Ahead These projects highlight the Town’s commitment to proactive stormwater management, preserving infrastructure integrity and public safety. As Commissioners tour these sites, they will observe firsthand the impact of erosion, the necessity for robust mitigation measures, and the importance of securing funding for long-term maintenance. This field trip serves as an essential platform for understanding the evolving challenges of stormwater infrastructure and ensuring the Town of Oro Valley remains resilient in managing these environmental factors. Project Location Legend Project Location 32.4096572223, -111.00835 Sierra Wash Major Streets Oro Valley Town Limits ¯Feet0250500 2020 Sierra Wash at Naranja Drive Drainage Improvements Location M ap Project Location SIERRA WASH AT NARANJA DRIVE CHANNEL DEGRADATION & ULTIMATE REPAIR December 2018 – View upstream (north) at result of channel downcung and local scour at rock embedded concrete apron. December 2018 – View downstream (south) from exis"ng box culvert at rock embedded concrete apron and channel vegeta"on. Note the channel degrada"on at end of apron is 5+/- feet exposing and causing a par"al failure of the exis"ng 3’ apron toe-down. Note that a sand bar/island that has formed, bifurca"ng the channel into an east and west branch with the east branch crea"ng erosion along the exis"ng east bank of the wash. SIERRA WASH AT NARANJA DRIVE CHANNEL DEGRADATION & ULTIMATE REPAIR June 2023 – View upstream (north) at new concrete drop structure and gabion apron w/gabion dissipa"on end sill. June 2018 – View downstream (south) from exis"ng box culvert at crest of drop structure and gabion apron and gabion dissipa"on Note: the drop structure addresses the threat of undermining the exis"ng box culvert from downcung of the channel. end sill. Addi"onally, the gabion apron will deflect to mi"gate future channel downcung, ac"ng as an extension o f the drop structure. Note the channel downstream of the gabion sill has been graded to remove the sand bar/island and significant vegeta"ve growth. The desert broom outcrop along the east bank was not removed so as to act as a deterrent to further erosion along the east bank. FIGURE 1 - LOCATION MAP AND PROJECT OVERVIEW LOCATION MAP SCALE: 3"= 1mi. A PORTION OF SECTION 12 T.12S., R.13E., G&S.R.M. PIMA COUNTY, ARIZONA PROJECT LOCATION W GLOVER RD N LA CHOLLA BLVDN LA CAÑADA DRBK/PG: 45023 BK/PG: 47089BK/PG: 48052 20132670162 SEQ. # W TANGERINE RD W NARANJA DR NARANJA RANCH 1 BK/PG: 52018 BK/PG: 52017 BK/PG: 54002 BK/PG: 50012 SUBDIVISION BOUNDARY Pima Associations of Government Naranja Park 2021 Mutterer Wash Alternatives Analysis Report 2 Figure 1 – Study Area Map 25102515252025252530253525402545255025552560256525702510251525202525253025352540254525502555256025652570-0+200+001+002+003+004+005+006+007+007+40-0+200+000+200+400+600+801+001+201+401+601+802+002+202+402+602+803+003+203+403+603+804+004+204+404+604+805+005+205+405+605+806+006+206+406+606+807+007+207+40NGREENOCK DRVALLE DEL ORO DRMUTTERER WASHGR E E N O C K D R 30%Pre l im ina ryNot Fo rConst ruc t ion 2510251525202525253025352540254525502510251525202525253025352540254525500+002+004+006+008+0010+0012+0014+0016+0018+0020+0022+0024+0026+0028+0030+0031+63NP U S C H V I E W L N DES E R T G O L F P LORACLE RDVALLE DEL ORO DRGREENOCK DRORO VALLEY DRLOCH L O M O N D P L LAMBERT LNLA M B E R T L N MUTTERER WASHPUSCH WASHROONEY WASHROONEY/CDO WASH30%Pre l im ina ryNot Fo rConst ruc t ion PLAN VIEW TYPICAL CONTROL JOINTTYPICAL WALL SECTION H= 4' AND TALLERTYPICAL FOOTING STEP WHERE REQUIREDFLOOD WALL DETAILTYPICAL LOW FLOW CHANNEL GRADING SECTION30%Pre l im ina ryNot Fo rConst ruc t ion