The City of Pomona Water Resources Department is the lead agency under the California Environmental Quality Act (CEQA) and has prepared this Initial Study (IS) to address the impacts of implementing the Pedley Spreading Grounds (PSG) Pond Enhancements (proposed project). The PSG consists of three basins and is currently configured to receive flows from the adjacent (to the north) neighborhood through 42-inch and 18-inch storm drains, as well as process water from the adjacent Pedley Filtration Plant (PFP). Located in the City of Claremont, California, the PSG are owned and operated by the City of Pomona.
The proposed project is a collaborative effort between the Cities of Pomona and Claremont to capture, treat, and infiltrate local urban runoff into the existing PSG to increase water supply through stormwater recharge and to decrease non-point source pollutants. Funding to implement the project is being sought from the Safe Clean Water Program, which is funded by a parcel tax intended to increase Los Angeles County local water supply, improve water quality, and invest in making communities greener and more livable. The mission of the Pomona Water Resources Department is to protect and manage groundwater resources for the people of the City of Pomona and to provide the cleanest water possible to residents and businesses.
The project includes: grading of the existing PSG basins to enhance percolation, modifications to an existing stormwater junction diversion structure, construction of a new control vault to improve stormwater conveyance to the basins, new water quality pretreatment structure, inlet storm drain extensions, energy dissipater and riprap pads, stilling basin and equalizer structures, spillways, access ramps and roadway improvements, and PFP outlet interconnect piping and controls. Additionally, the project includes implementation of improvements (pathway, plantings, educational signage, viewing area with benches, fencing, and a bike rack) at the Chaparral Park north of the spreading grounds.
Chaparral Elem, Claremont Colleges, Pomona College
San Antonio Creek, Thompson Creek
Notice of Completion
State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Parks and Recreation, California Department of Transportation, Division of Aeronautics (DOT), California Department of Transportation, Division of Transportation Planning (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB), Department of Toxic Substances Control, Office of Historic Preservation, San Gabriel and Lower Los Angeles Rivers and Mountains Conservancy (RMC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance, California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Transportation, District 7 (DOT)
State Reviewing Agency Comments
California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Transportation, District 7 (DOT)
Recreational (Chaparral Park Improvements), Water Facilities (Pedley Filtration Plant)(Type Stormwater Mgmt, MGD 4)
Aesthetics, Air Quality, Biological Resources, Drainage/Absorption, Geology/Soils, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Noise, Public Services, Recreation, Solid Waste, Transportation, Vegetation, Wetland/Riparian, Archeological/Historical, Soil Erosion/Compaction/Grading, Water Supply/Groundwater
Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents.
To obtain an attachment in a different format, please contact the lead agency at the contact information listed above.
You may also contact the OPR via email at email@example.com or via phone at (916) 445-0613.
For more information, please visit OPR’s Accessibility Site.