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Page 5 of 19 21418818.2 Step 3: SFPUC Maximum Cutback Reserve The Maximum Cutback establishes the lower limit for each Wholesale Customer’s final allocation. See Step 0 for more information. No water is allocated in this step. Instead, this step calculates the gap between each Wholesale Customer’s allocation after Step 2 and the lower limit of its potential final allocation. This step then reserves the sum of the gap for all Wholesale Customers from the Overall Wholesale Customer Allocation for Step 5. This Maximum Cutback Reserve ensures, after other steps are applied, that sufficient water is available in the final step to provide that each Wholesale Customer’s final allocation is equal to, or greater than, the lower limit of its potential allocation established by the Maximum Cutback. Step 4: Seasonal Allocation Step 4 allocates water based on estimated seasonal purchases from the RWS. The inverse of each Wholesale Customer’s Base Period Percent Indoor Demand (1 - % Indoor Demand) is used to estimate percent seasonal demand, which is then multiplied by Base Period SFPUC Purchases to estimate each Wholesale Customers’ SFPUC seasonal purchases. Each Wholesale Customer’s estimated SFPUC seasonal purchases are multiplied by the Seasonal Cutback Factor to establish each Wholesale Customer’s Seasonal Allocation. The Seasonal Cutback Factor is calculated based upon the Overall Wholesale Customer Allocation remaining to be allocated after Step 2. Of the remaining Overall Wholesale Customer Allocation after Step 2 (less the Maximum Cutback Reserve), 50% is allocated through the Seasonal Minimum Allocation Step. The detailed methodology for calculating the Seasonal Cutback Factor is described in Attachment B. Step 5: SFPUC Purchases and ISG-Based Allocation Step 5 allocates the water remaining after Step 4 to get agencies as close to the “Target Allocation” as possible. Each Wholesale Customer’s Target Allocation is based on a weighted share of two-thirds Base Period SFPUC Purchases and one-third ISG (or proxy) while ensuring each agency’s final allocation is between the Minimum and Maximum Cutback limits. The detailed methodology for calculating the Base Period SFPUC Purchases and ISG weighted allocation is described in Attachment B. 6.Plan Implementation The Tier 2 Plan applies when, and only when, the SFPUC declares a Drought that has is a system-wide water shortage of 20 percent or less. The Tier 2 Plan applies only to water acquired and distributed by the SFPUC to the Wholesale Customers through the WSA and has no effect on water obtained by a Wholesale Customer from any source other than the SFPUC. Shortages Greater than 20 Percent In no way should it be construed that the Wholesale Customers relieve the SFPUC of its obligations established in the Level of Service goals adopted in the Water System Improvement ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A REV: 08-18-25 MI Page 7 of 21