and the LAWRP Fuel Facility) and the Deep Aquifer Treatment System (DATS) facility (which includes two wells and DATS plant). VI. Seismic Mitigation Actions Due to the inherent seismic risk associated with infrastructure based in Southern California the following mitigation actions have already been implemented or are currently being considered to alleviate potential risks: • Implement low-cost, easy to implement, earthquake mitigation measures in facilities (e.g., bracing items to walls, anchoring equipment to the slab, installing earthquake-activated shut-off valves, providing flexible connections to piping or conduit). • Monitor changes and updates to building codes and seismic regulations to determine if IRWD-owned critical facilities may need seismic retrofits as they age and building codes are updated. • Implementing earthquake mitigation measures for critical operations. • Include assessment and mitigation of potential liquefaction conditions in the scope of any new building or infrastructure project. • Perform monthly checks on permanent and portable backup generators. • Maintain WEROC membership for communication and collaboration opportunities with regional water districts, including identification and implementation of mitigation actions with shared benefits. • Consider implementing backup communication systems such as satellite phones and amateur radio. • Consider moving backup servers to locations that are not on the same earthquake fault lines as the primary servers or to cloud-based services. • Consider developing and seeking funding for an evaluation program to determine the seismic vulnerability of critical assets. • Evaluate dam improvements to increase resiliency in coordination with the Dam Safety Program and Implementation Plan • Regularly conduct earthquake and evacuation drills with all staff. 1.4 Multiple Dry Year Analysis and Drought Risk Assessment IRWD’s 2025 UWMP includes an assessment of IRWD’s reliability during normal, dry, and multiple dry water years as well as a Drought Risk Assessment (DRA). The DRA and WSCP share a similar purpose and are developed to jointly assess IRWD’s current and future water reliability, especially during extended periods of drought. The water reliability analyses indicate that IRWD is reliable throughout all conditions including single dry year, multiple dry year, as well as during an extended drought. Table 1-2 shows the results of the potable multiple dry year water reliability analysis. See IRWD 2025 UWMP Section 7 for the full normal, single-dry, and multiple dry year analysis and tables.
WSCP - 11
IRWD – 2025 Water Shortage Contingency Plan
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