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Page 12 of 19 <br />21418818.2 <br />Purchases (up to ISG or proxy) are multiplied by 1 minus the minimum cutback factor. An <br />example equation is provided below. π‘Šπ‘Šβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ πΆπΆπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆ π‘“π‘“π‘“π‘“π‘“π‘“π‘œπ‘œπ‘œπ‘œ π‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘Žπ‘Žπ‘œπ‘œπΆπΆπ‘“π‘“π‘œπ‘œπ‘“π‘“ π‘œπ‘œπ‘œπ‘œπ‘™π‘™π‘œπ‘œπΆπΆ π‘œπ‘œπ‘“π‘“πΆπΆπ‘“π‘“πΆπΆ = π΅π΅π‘œπ‘œπ‘œπ‘œπ‘œπ‘œ π‘ƒπ‘ƒπ‘œπ‘œπΆπΆπ‘“π‘“π‘œπ‘œπ‘ƒπ‘ƒ 𝑆𝑆𝑆𝑆𝑃𝑃𝑆𝑆𝐢𝐢 π‘ƒπ‘ƒπΆπΆπΆπΆπ‘Žπ‘Žβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ × οΏ½1 βˆ’(1.5 × π‘‚π‘‚π‘‚π‘‚π‘œπ‘œπΆπΆπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ π΄π΄π‘‚π‘‚π‘œπ‘œπΆπΆπ‘œπ‘œπ΄π΄π‘œπ‘œ π‘Šπ‘Šβ„Žπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œπ‘œ πΆπΆπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆπ‘œπ‘œπΆπΆ π‘…π‘…π‘œπ‘œπ‘ƒπ‘ƒπΆπΆπ‘Žπ‘ŽπΆπΆπ‘“π‘“π‘œπ‘œπ‘“π‘“)οΏ½ <br />Efficient Residential Volume <br />The Tier 2 Plan uses a per-capita volume, in gallons, to calculate each Wholesale Customer’s <br />Efficient Residential Allocation (Step 1 of the Allocation Model). The per-capita volume is 47 <br />gallons per capita per day through 2029 and 42 GPCD beginning in 2030, consistent with the <br />State of California Indoor Residential Water Use Standard for 2025 established by SB 1157. <br />SFPUC Reliance <br />For agencies with multiple potable water sources, the Tier 2 Plan calculates SFPUC Reliance <br />by dividing each agency’s Base Period SFPUC Purchases by Base Period Total Potable Water <br />Production, expressed as a percentage. SFPUC Reliance is used in Step 1 to calculate multi- <br />source agency’s Residential Efficient Allocation met by the RWS. <br />Population <br />The Tier 2 Plan uses population reported in the most recently published Annual Survey to <br />calculate each Wholesale Customer’s Efficient Residential Allocation in Step 1. <br />BAWSCA reviews data submitted for the Annual Survey and works with agencies to ensure the <br />information is correct before making it public. As part of this annual review, BAWSCA will flag <br />any agencies that have reported population increases greater than 5%. BAWSCA will first <br />confirm with the agency that there are no reporting errors. If the reported data are correct, <br />BAWSCA will include a note to all agencies during the annual review of the Tier 2 Plan. <br />Stanford University Population Calculation <br />Stanford has historically reported its population in the BAWSCA Annual Survey using data from <br />the Stanford Office of Institutional Research & Decision Support, which annually documents <br />population based on student enrollment and data from human resources. This number captures <br />all students (undergraduate and graduate), post-docs, faculty, and staff that are employed and <br />work on campus. The population report does not directly capture residential population that is <br />not enrolled or employed (significant others or dependents). However, it would include a <br />daytime population component. Stanford reviewed several population sources and calculation <br />methods including census data. Based on review of the available sources for population <br />information, Stanford proposed, and the BAWSCA agencies agreed, to utilize a formula that <br />captures student and faculty/staff residential population. This new approach would eliminate the <br />inclusion of daytime staff and faculty who do not live on campus. <br />The formula takes the Office of Institutional Research & Decision Support data and uses only <br />the "Total Students" and adds a multiplier of 2.57 people per residence (single and multi-family) <br />for the faculty/staff housing area. <br />ATTY/RESO.0092/CC RESO APPROVING TIER 2 DROUGHT RESPONSE IMPLEMENTATION PLAN (WATER SUPPLY AGREEMENT) - EXHIBIT A <br />REV: 08-18-25 MI <br /> <br />Page 14 of 21