YEA 2021 – Mountain Avenue West Recharge Basin

Dudek

Project Location: San Jacinto, California

Category: Water + Stormwater + Wastewater

Started: May 1, 2017

Completed: October 10, 2021

Project Budget: $16,180,000

Project Cost: $13,895,059

Project Leadership Team:

• Dudek – Prime Engineering Consultant/Engineer of Record/Drilling Construction Management/Oversight
• H&H General Contractors, Inc. – Prime Contractor
• Cozad and Fox, Inc.– Surveying Services
• Moraes, Pham and Associates– Electrical Engineering
• C Below Surface Imaging– Potholing
• Todd Groundwater– Hydrogeology
• BC2 Environmental– Hydrogeological Drilling
• RF Yeager Engineering– Corrosion Engineer
• Converse Consultants – Geotechnical
• Helix Consulting – Environmental
• Water Systems Consulting – Hydrogeologic Support
• DHK Engineers – Noise and Vibration Monitoring
• Michael Baker International – Storm Inspections and Reporting
• Jacobs Engineering, Inc. – Hydrogeologic Support
• Environmental Science Associates – Environmental
• Casamar Group – Labor Compliance

Project Overview:  The Mountain Avenue West Recharge Basin is a 40-acre recharge facility that is part of the larger San Jacinto Valley Enhanced Recharge and Recovery Program (SJVERRP).  Located close to residential neighborhoods, a public park, and critical transportation and utility infrastructure, completion of this project was paramount to reducing the operational risk associated with the recharge facility.  This project features three separate basin facilities: one for de-sitting and flow distribution and the other two for recharge operations.  The two basins responsible for recharge operations are capable of recharging up to 30,000 acre-feet per year.  The project also features several mitigation and safety features such as rigid dust control measures, embankment slope lining with soil cement to reduce lateral transmission of recharge water and eliminate slope erosion, a perimeter berm to reduce traffic distractions, basin water monitors tied into a supervisory control and data acquisition system, and eleven groundwater monitoring wells around the site.  In addition, the project features perimeter and landscape trail improvements that utilize native, drought tolerant vegetation and a water-efficient dip irrigation system.

Impact(s): The Mountain Avenue West Recharge Basin will have a significant impact on the surrounding San Jacinto Valley.  In an environment where water usage is always a subject of discussion, this facility allows the community to plan for the future by allowing for conjunctive use of advanced purified water, surface, and groundwater resources.  During wet years, surplus water will be stored in the basin, which allows future access when the area is experiencing a drought.  In addition to providing more accessible, reliable, and sustainable resources for the community, it also allows for recreation with a 1-mile walking trail around the facility.

Highlights:

• Flow control and metering facilities for up to 42 cubic feet per second (cfs) of raw water
• Flow control and metering facilities for up to 21 cfs of future advanced purified recycled water supplies
• Basin inlet and hydraulic control structures featuring manually operated channel gates with a passive overflow emergency bypass system
• Grading plans and details for nearly 400,000 cubic yards of excavation and export