Aspan Well Rehabilitation and Treatment Project

Aspan Well Rehabilitation and Treatment Project

The proposed project consists of the rehabilitation of the Aspan Well which is currently inactive and has experienced deterioration of the well casing. As part of the rehabilitation, the City of Azusa will install a new well casing liner to preserve the well's integrity and will remove the existing welded steel tank and booster pump station from the site. The current water quality issue for the Aspan Well is the presence of 1,1-DCE in excess of the maximum contaminant level (MCL), the concentration allowed in drinking water by the California State Water Resources Control Board – Division of drinking Water, which requires the installation of a Liquid Phase Granular Activated Carbon (LGAC) treatment system. The proposed LGAC treatment system will be designed for a flow of approximately 1,800 gallons per minute (gpm) and will include two pairs of 12-foot diameter filtration vessels. In addition, Nitrate has been detected in the past in the Aspan Well, although Nitrate concentrations were recently shown to be below the MCL. If treatment for nitrates is needed, the IX treatment system will be installed downstream of the LGAC system and will feature three vessels working in parallel. A new 34,000 gallon brine waste tank will be constructed to temporarily hold the brine waste, which will be discharged from the tank to a Los Angeles County Sanitation Districts’ (LACSD) sewer line. A new 8-inch diameter PVC brine discharge pipeline will convey brine waste to the LACSD sewer line. Well waste water, well test water, and waste water for testing operations will be discharged through a new drain pipeline that will connect to the existing Los Angeles County Flood Control District (LACFCD) 51-inch diameter storm drain.

Azusa

Los Angeles

Citywide

California Air Resources Board (ARB), California Department of Fish and Wildlife, South Coast Region 5 (CDFW), California Department of Parks and Recreation, California Department of Toxic Substances Control (DTSC), 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), 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 Drinking Water, District 15, State Water Resources Control Board, Division of Drinking Water, District 16, State Water Resources Control Board, Division of Drinking Water, District 22, State Water Resources Control Board, Division of Drinking Water, District 7, State Water Resources Control Board, Division of Water Rights, State Water Resources Control Board, Divison of Financial Assistance, California Department of Transportation, District 7 (DOT)

California Department of Transportation, District 7 (DOT)

Water Facilities (Water Treatment Facility)(Type LGAC Treatment, MGD 1.63)

Water Treatment

Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Septic System, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Wetland/Riparian, Wildfire