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Page 10 of 19 21418818.2 Attachment B: Tier 2 Plan Data Sources and Calculations BAWSCA Annual Survey Each year, BAWSCA conducts an annual survey of its members in order to update key BAWSCA service area information including population, current and projected water use, and climatology. BAWSCA begins collecting data in October of each year. The Wholesale Customers submit data through BAWSCA’s Water Conservation Database. Between approximately January and March, BAWSCA reviews the Wholesale Customers’ submissions for potential errors and works with Wholesale Customers to confirm and finalize the data. The final report is published around March of each year for the fiscal year ending the previous June 30th. Base Period inputs will use data published in the Annual Surveys from the previous three non- Drought years. Depending on when the SFPUC declares a shortage emergency, the most recent non-Drought year’s Annual Survey may not be finalized and published. If the most recent non-Drought year’s Annual Survey is not available, the Base Period inputs will use data from the three most recent non-Drought year’s published in Annual Surveys. Base Period The Tier 2 Plan uses historical SFPUC purchases, total potable water production, monthly potable production, potable consumption by customer category, and population for Steps 0 through 5. These values are established using a historical base period with established water supply and delivery data. The Base Period for all inputs except population is defined as the average from the highest two years of SFPUC Purchases over the most recent three non-Drought years. The selection of Base Period is unique to each Wholesale Customer. Two example agencies are provided in the table below, where the data associated with the highest two years are highlighted. Previous Non- Drought Year Agency A Agency B SFPUC Purchases Percent Non- Residential SFPUC Purchases Percent Non- Residential Year 1 2.50 70% 5.90 58% Year 2 2.75 69% 6.20 56% Year 3 2.40 67% 6.10 55% Calculation (2.50 + 2.75)2 (0.70 + 0.69)2 (6.20 + 6.10)2 (0.56 + 0.55)2 Average of Highest Two Years 2.63 70% 6.15 55.5% Coastside CWD Special Provisions for Base Period Calculations 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%. ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A REV: 08-18-25 MI Page 12 of 21