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Basin 8-1 Overview 3. SOUTH EAST MANAGEMENT AREA The South East Management Area contains portions of Irvine Ranch Water District (IRWD), El Toro Water District (ETWD), and the City of Orange. The area covered this management area is essentially an extension of the main basin and was formed to comply with the requirement that the entirety of Basin 8-1 be covered by a responsible agency. There is relatively little existing, or potential, groundwater development within the South East Management Area. What pumping does occur is less than 200 acre -feet -per -year (afy), which is much less than the total recharge to the area. Water levels and storage levels are steady. The Sustainability Goal for the South East Management Area is to recognize it is a small part of the larger groundwater basin that is managed by OCWD. Nevertheless, groundwater levels and water quality will be monitored to assure that conditions do not lead to significant and unreasonable (1) lowering of groundwater levels, (2) reduction in storage, (3) water quality degradation, (4) inelastic land subsidence, (5) unreasonable adverse effect on surface water resources, and (6) adverse impacts on hydrologically connected surface water. 4. SANTA ANA CANYON MANAGEMENT AREA The Santa Ana Canyon Management Area covers the easternmost extent of Basin 8-1. The water resources in the Santa Ana Canyon Management Area include the Santa Ana River and groundwater. Groundwater is primarily located in a thin alluvial aquifer that is 90 to 100 feet thick and is a combination of infiltrated surface water and groundwater inflow from the adjacent foothills. Groundwater pumping in this management area is primarily used for irrigation with a minimal amount used for potable purposes. The amount of groundwater pumping is small relative to the large volumes of flow in the canyon provided by the Santa Ana River and monitoring indicates there are no depletions of interconnected surface water that have significant and unreasonable adverse impacts on beneficial uses of the surface water. There are no groundwater withdrawals within the areas covered by the Cities of Anaheim, Chino Hills, and Yorba Linda; Riverside County; and Yorba Linda Water District. OCWD has water rights to all Santa Ana River flows released through Prado Dam. For the area within its boundary, OCWD has the legal authority through the OCWD Act to require reporting of groundwater production and to charge groundwater pumping assessments for groundwater production. OCWD also monitors surface water flow and quality as well as groundwater levels and quality throughout the Santa Ana Canyon Management Area. The Sustainability Goal for the Santa Ana Canyon Management Area is to continue monitoring sustainable conditions and monitor to ensure that no significant and unreasonable results occur in the future. 2017 BASIN 8-1 ALTERNATIVE Overview 7 55D-52