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BARTLE WELLS ASSOCIATES 15 | Pag e City of San Leandro Draft 2024 Wastewater Rate Study Table 6 – Wastewater Loadings 4.4 Functional Allocation The next step in the cost of service analysis is to assign wastewater system costs in each allocation category for revenue recovery via the functional cost components of customer service, flow, BOD (biochemical oxygen demand), and TSS (total suspended solids). While there is no single correct approach for cost allocation, BWA believes that costs should be allocated within a reasonable range that reflects both a) underlying cost causation, to the extent such causation can reasonably be determined or estimated, and b) the policy preferences of the agency in cases where a range of reasonable approaches can be justified. This process is intended to proportionately allocate costs to each functional component to determine the revenue requirement for each component. The allocations to each functional component were based on input from City staff. The functional cost components are described as follows: • Customer Service reflects costs associated with administration and serving the City’s customers. • Flow reflects costs associated with the volume of wastewater collected and treated. • BOD reflects costs associated with treating BOD. • TSS reflects costs associated with treating TSS. EDUs1 BOD1 TSS2 BOD TSS Annual Bills (mg/l) (mg/l)(lbs) (lbs) (#) Classification A (Residential) Single Family 14,191 300 300 1,919,598 1,919,598 170,292 Multi Family / ADU 4,398 300 300 526,577 526,577 5,472 Total Residential 18,589 2,446,176 2,446,176 175,764 Classification B (Commercial & Institutional) Low 225 225 25,966 25,966 240 Medium 300 300 533,579 533,579 13,440 High 825 825 245,571 245,571 1,582 Classification C (Industrial & Other Large Users) Industrial 3,844,392 881,093 108 Total Non-Residential 4,649,508 1,686,210 15,370 Total 7,095,684 4,132,386 191,134 1 "BOD" stands for biochemical oxygen demand. 2 "TSS" stands for total suspended solids. 3 State Water Resource Control Board (SWRCB) Guidelines for Wastewater Agencies. Strength (mg/l)3 Loadings (lbs)