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21 the wholesale customers to achieve necessary water use reductions during drought periods. The allocations outlined in the Tier One Plan are provided in Table 6-1. Table 6-1. Tier One Water Shortage Allocation Plan System-Wide Reduction Share of Available Water SFPUC Wholesale Customers ≤ 5 % 35.5% 64.5% 6 – 10% 36.0% 64.0% 11 – 15% 37.0% 63.0% 16 – 20% 37.5% 62.5%  The Tier Two Plan allocates the collective wholesale customer share among the wholesale customers based on a formula that accounts for each wholesale customer’s ISG, seasonal use of all available water supplies, and residential per capita use. BAWSCA calculates each wholesale customer’s Allocation Factors annually in preparation for a potential water shortage emergency. BAWSCA recognizes that the Tier Two Plan was not designed for RWS shortages greater than 20 percent, and in a memorandum dated March 1, 2021, BAWSCA provided a refined methodology to allocate RWS supplies during projected future single dry and multiple dry years in the instance where supply shortfalls are greater than 20 percent for the purposes of the BAWSCA member agencies’ 2020 UWMPs. The revised methodology developed by BAWSCA allocates the wholesale supplies as follows: • When the average Wholesale Customers’ RWS shortages are 10 percent or less, an equal percent reduction will be applied across all agencies. This allocation is consistent with the existing Tier Two requirements in a Tier Two application scenario. • When average Wholesale Customers’ shortages are between 10 and 20 percent, the Tier Two Plan will be applied. • When the average Wholesale Customers’ RWS shortages are greater than 20 percent, an equal percent reduction will be applied across all agencies. In another memorandum dated February 18, 2021, BAWSCA explains that in actual RWS shortages greater than 20 percent, BAWSCA Member Agencies would have the opportunity to negotiate and agree upon a more nuanced and equitable approach. This would likely consider basic health and safety needs; the water needs to support critical institutions and minimizing economic impacts on individual communities and the region. As such, the allocation method described in the City’s 2020 UWMP is only intended to serve as the preliminary basis for the 2020 UWMP supply reliability analysis. The analysis provided in the SFPUC 2020 UWMP and the City’s 2020 UWMP does not in any way imply an agreement by BAWSCA member agencies as to the exact allocation methodology. BAWSCA member agencies are in discussions about jointly developing an allocation method that would consider additional equity factors in the event that SFPUC is not able to deliver its contractual supply volume, and its cutbacks to the RWS supply exceed 20 percent. ATTY/RESO.0027/CC RESO WATER SUPPLY ASSESSMENT (920 SHASTA) - EXHIBIT A REV: 04-22-25 VR Page 21 of 42