SCH Number 2023030023

Project Info

Title

Pedley Spreading Grounds Pond Enhancements

Description

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.

2 documents in project