Site & Civil Design

Wells, pipelines, structures, and site conditions

The facility includes two new groundwater wells, underground pipelines, a pump station, and a steel-framed treatment building, all designed for the site's geologic and seismic conditions in Jurupa Valley.

Production Wells

Two new deep groundwater wells will be constructed on the project site, one in each phase. Each well produces approximately 2.25 MGD under normal operations. The wells alternate pumping cycles to reduce wear and minimize cumulative drawdown on the aquifer.

Drawdown 22.9 ft
Standing Water Level 76.5 ft
Pumping Water Level 99.4 ft
Influence Radius 124–150 ft

Wells are spaced to prevent overlapping drawdown cones. Design is based on reference data from the nearby Well 6 at Anita B. Smith, which operates under similar groundwater conditions.

Site plan showing the locations of the two proposed production wells
Location of the two proposed production wells on the project site
Plan view drawing of a typical production well showing surface equipment and casing layout
Typical well plan view
Hydraulic grade line diagram showing pressure and elevation along the pipeline system
Hydraulic grade line for the pipeline system

Piping

Three pipeline segments connect the wells, RO facility, and existing distribution system. All pipelines are installed underground in existing rights-of-way or utility easements.

Segment Flow Diameter Material Velocity
Well to RO Facility 2.5 MGD 12" CML&C Steel ~3.87 ft/s
RO to Distribution 4.5 MGD 24" CML&C Steel ~3.48 ft/s
Brine Disposal 0.5 MGD 8" CML&C Steel ~1.16 ft/s

Velocities are within accepted industry guidance (~3 ft/s for production, up to 10 ft/s for flushing). All pipe is cement mortar lined and coated steel per AWWA C200.

Pump Station

The facility uses VFD-controlled (Variable Frequency Drive) horizontal split-case pumps. Pump speed adjusts dynamically to match system demand, providing precise flow and pressure regulation while improving energy efficiency compared to fixed-speed alternatives.

Treatment Building

The RO treatment process is housed in a steel-framed building designed to accommodate all six skids at full build-out, with a crane system overhead for maintenance access.

Type Steel butler building, enclosed
Dimensions 105 ft × 80 ft × 16 ft walls
Roof 1:12 slope, MR-32 system with solar allowance
Steel Girders W30×148 (A992 steel), 5 girders, 10 columns
Seismic Shear 24,787 lbs
Wind Load 28,575 lbs (100 MPH, Exposure C)
Features Crane system for maintenance, two garage doors
All structural members pass deflection, moment, and shear checks. The roof includes a 2 psf allowance for future rooftop solar panel installation.

Geotechnical Conditions

The project site is located at the southeastern base of the Jurupa Mountains, underlain by Pleistocene alluvial fan deposits. The soil consists primarily of sandy loam and fine sand with low expansion potential and good drainage.

Regional geologic map showing the project area and surrounding geological formations
Regional geologic mapSource: U.S. Geological Survey, 2003
Seismic hazard and fault map showing nearby fault lines relative to the project site
Seismic hazard and fault mapSource: U.S. Geological Survey, 2003

Seismic

No active faults cross the site. Nearest fault is the San Jacinto Fault. Liquefaction susceptibility is moderate.

Flood Risk

Outside the FEMA 100-year flood zone with low erosion risk.

Foundation

Shallow spread footings with estimated 2,000–3,000 psf bearing capacity. Subsurface exploration is required before final design.

Hydrology

The site has very low runoff conditions due to the dry climate and small site area. The 100-year design storm intensity is 0.2 in/hr. Soil is predominantly high-infiltration (71% Class A, 29% Class C).

Condition Peak Discharge Travel Time
Pre-development 0.018 CFS 12.5 min
Post-development 0.030 CFS 8.5 min

Peak flows are extremely low. The on-site rain garden is sufficient to accommodate all runoff, so no additional stormwater infrastructure is required.