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Lysimeters to Assess Regulatory Compliance
Lysimeter head assemblies on the levee above the recharge basin
Inland Empire Utilities Agency
The Inland Empire Utilities Agency (IEUA) was formed to supply supplemental water to its region. The Nitrogen/TDS Task Force (Task Force) was formed in 1995-96 to conduct studies regarding the TDS and nitrate-nitrogen objectives and other components of the N/TDS management plan due to the concern of watershed stakeholders that were questioning the validity of the Basin Plan. The Santa Ana Watershed Project Authority coordinated the task force, which is comprised of 22 water supply and wastewater agencies throughout the region.
The Task Force recommendations for changes to the TDS and nitrate-nitrogen water quality objectives for groundwater within the region are based on consideration of factors specified in Water Code Section 13241 and the stateÕs antidegradation policy (SWRCB Resolution No. 68-16). The economic implications of all recommended changes to the N/TDS management plan were also considered. The Regional Board and the State Department of Health Services (DHS) provide oversight to the Chino Basin Recycled Water Groundwater Recharge Program. The DHS has been developing draft regulations for the recharge of recycled water. Early versions of these proposed regulations required the project proponent to drill and install monitoring wells in the recharge "mound" beneath the recharge basin to demonstrate reduction of total organic carbon and total nitrogen to concentrations specified in the permit.
WEI installed lysimeters in the bottom of the recharge basins to ensure that samples collected while the recharge basin is being operated are truly representative of the recharged water.
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