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Page 3 of 19 21418818.2 •Base Period SFPUC Reliance: Each Wholesale Customer’s Base Period SFPUC Purchases divided by Base Period Total Potable Water Production, expressed as a percentage. •Base Period Percent Indoor Demand: The single lowest month’s total potable demand (a proxy for indoor use) divided by the average monthly total potable demand, expressed as a percentage. The resulting percentages are averaged for the two selected Base Period years. •Base Period Percent Non-Residential Demand: Each Wholesale Customer’s potable water consumption from the Base Period from all customer categories except residential, divided by the Wholesale Customer’s Base Period Total Potable Water Production, expressed as a percentage. The resulting percentages are averaged for the two selected Base Period years. •Individual Supply Guarantee (ISG): Each Wholesale Customer’s share of the Supply Assurance, as shown on Attachment C to the WSA, with proxies for Hayward, San Jose, and Santa Clara in order to provide inputs for the Tier 2 Allocation Formula There are three exceptions to the Base Period Calculations: (1) Coastside County Water District (“Coastside CWD”) Base Period SFPUC Purchases and Base Period SFPUC Reliance, (2) Stanford Base Period Percent Indoor Demand, and (3) Stanford Population Calculation. (1)Coastside CWD Base Period SFPUC Purchases will be calculated as 94% of its Base Period Total Potable Water Production. Base Period SFPUC Reliance will be fixed at 94%. More information is provided in Attachment B. (2)Stanford’s Base Period Percent Indoor Demand calculation will exclude demand from the month of December and/or January when the campus is closed and demand is abnormally low. (3)Stanford’s population is calculated as described in Attachment B. Furthermore, three Wholesale Customers do not have an ISG and a proxy is used in the Tier 2 Plan: (1) Hayward, (2) San Jose, and (3) Santa Clara. Background on ISG and each ISG proxy is described in Attachment B. Data sources, methodologies, and equations used to calculate each input are described further in Attachment B. Step 0: Establish SFPUC Minimum and Maximum Cutback The Minimum and Maximum Cutback establish the upper and lower bounds for each Wholesale Customer’s final allocation. No water is allocated in this step. Instead, allocations in subsequent steps are limited such that no Wholesale Customer’s final allocation is outside the upper and lower bounds (i.e., above the Minimum Cutback or below the Maximum Cutback) established in this step. Minimum Cutback: Each Wholesale Customer will contribute to meeting the Overall Average Wholesale Customer Reduction by taking a Minimum Cutback from its Base Period SFPUC ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A REV: 08-18-25 MI Page 5 of 21