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City of San Leandro Stormwater Fee Draft Report 3. Rate Structure Analysis HF&H Consultants, LLC Page 9 February 23, 2024 Each individual parcel’s SFE is then calculated by multiplying the parcel size (in acres) times the SFE per acre for that land use category, as shown in the following formula: Parcel Size (acres) x SFE per Acre = SFE DEVELOPED VACANT4 PARCELS Developed vacant parcels are devoid of obvious structures or improvements but are distinguished from undeveloped vacant land by one of several characteristics. Typically, a developed vacant parcel has been graded to be ready for building construction (possibly as part of the original subdivision or adjacent street grading). In some cases, the parcel previously contained a structure or improvement that has been removed, but its fundamental alteration from a natural state remains. Although developed vacant parcels may have significant vegetative cover, the underlying soil conditions resulting from grading work or previous improvements usually cause some rainfall to runoff into the storm drainage system. The average percentage of Impervious Area for developed vacant parcels is reasonably assumed to be 1.8%, which is also used as a minimum value of imperviousness for any land use type (excluding open space and agricultural land, which assumes to have no impervious surface area). Vacant parcels that have significant impervious paving remaining from prior improvements may be classified as Commercial/Municipal or some other classification best representing the average Impervious Surface Area of the parcel. STORMWATER FEE CALCULATION The primary metric in this analysis is the SFE as illustrated above. To arrive at the fee amount for the various land use categories, the total City-wide SFEs must be divided into the total revenue requirement to arrive at the rate per SFE. Using the analysis above, that calculation is represented by the following formula: 𝑆𝑆𝑆𝑆𝑆𝑆 𝑅𝑅𝐴𝐴𝑅𝑅𝑃𝑃=𝐴𝐴𝐴𝐴𝐴𝐴𝐼𝐼𝐴𝐴𝐴𝐴 𝑅𝑅𝑃𝑃𝐴𝐴𝑃𝑃𝐴𝐴𝐼𝐼𝑃𝑃 𝑅𝑅𝑃𝑃𝑅𝑅𝐼𝐼𝐼𝐼𝑃𝑃𝑃𝑃𝐼𝐼𝑃𝑃𝐴𝐴𝑅𝑅 Total SFEs Based on the numbers from our analysis, the rate per SFE is calculated as follows: 𝑆𝑆𝑆𝑆𝑆𝑆 𝑅𝑅𝐴𝐴𝑅𝑅𝑃𝑃=$4,769,780 63,931 = $74.61 The SFE rate amount is then multiplied by the SFEs per parcel or acre for the various land use categories to arrive at the updated Stormwater Fees shown in Table 6 (fund all capital projects) and Table 7 (fund high and very high priority projects only). 4 “Vacant” in this Report refers to land that is devoid of improvements. It does not refer to land with vacant buildings or improvements, which would continue to shed water as if they were occupied.