Thank you to those of you who submitted comments on the Initial Study/Mitigated Negative Declaration (IS/MND), for the Peck Water Conservation Improvement Project. The comment period ended on August 8, 2014. However, you may view the IS/MND by clicking the links in the Resources section below.
The Peck Road Spreading Basin (spreading basin) has low percolation rates and major sediment accumulation due to uncontrolled storm flows from Santa Anita Wash and Sawpit Wash. The spreading basin's percolation rate into the Main San Gabriel Groundwater Basin is reduced due to an underlying clay layer. The low percolation rate in the spreading basin limits the amount of water that can be captured for recharge and can cause the basin to fill up quickly, allowing the water to be wasted through the concrete-lined Rio Hondo Channel to the ocean. Additionally the sediment accumulation restricts water flows and causes a separation between the northern and southern portions of the spreading basin.
The proposed [Peck Water Conservation Improvement] project has been designed to address these adverse conditions. The proposed project involves construction of a pump station and a 7,000-foot pipeline to transfer water to the soft-bottom San Gabriel River. The San Gabriel River has much greater percolation rates and also percolates into the Main San Gabriel Groundwater Basin, which would improve water supply sustainability efforts. The proposed project also involves the excavation and removal of the accumulated sediment within the spreading basin, thereby removing water flow constrictions.