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City of San Leandro Stormwater Fee Draft Report 3. Rate Structure Analysis HF&H Consultants, LLC Page 8 February 23, 2024 properties, the SFE for each land use category is calculated on a per-acre basis, so size of the parcel can be a variable. The SFE-per-acre is computed for each non-residential category using the formula below, taking into account the average Impervious Surface Area for each non-single family category as sampled and summarized in Table 5. 𝑆𝑆𝑆𝑆𝑆𝑆 𝑃𝑃𝑃𝑃𝑃𝑃 𝐴𝐴𝐴𝐴𝑃𝑃𝑃𝑃=(43,560 square feet per acres) 𝑥𝑥 𝐴𝐴𝐴𝐴𝑃𝑃𝑃𝑃𝐴𝐴𝐴𝐴𝑃𝑃 % 𝑜𝑜𝑜𝑜 𝐼𝐼𝐼𝐼𝐼𝐼𝑃𝑃𝑃𝑃𝐴𝐴𝐼𝐼𝑜𝑜𝐼𝐼𝐼𝐼 𝐴𝐴𝑃𝑃𝑃𝑃𝐴𝐴3,067 square feet of Impervious Areas per SFE (from Table 3) Table 4 shows a summary of resulting parcel SFEs for each non-Single Family land use category. Table 4. Summary of SFEs per Acre for Each Non-Single Family Land Use CALCULATION OF ESTIMATED IMPERVIOUS SURFACE AREAS – BY LAND USE For most land use categories, a sample of parcels was analyzed using the Alameda County’s Geographic Information System (GIS) to determine the average percentage Impervious Surface Area. Table 5 below shows the results of that analysis. Table 5. Impervious Area Sampling Results Land Use Category # of Parcels # of Parcels Sampled Total Acres Sampled Total Acres Impervious Area Single-Family Residential Small < 3,200 sq. ft.1,193 36 1.9 1.3 1,602 sq. ft. Medium 3,200 to 7,200 sq. ft.16,111 484 58.7 33.7 3,067 sq. ft. Large > 7,200 sq. ft.3,094 93 20.7 9.8 4,617 sq. ft. Non-Single-Family Residential Apartments/Condos 2,036 61 49.2 35.1 71.3% Commercial/Municipal 1,929 58 22.1 19.4 87.6% Schools 19 19 151.3 83.9 55.4% Parks 35 35 90.8 15.1 16.6% Golf Courses 6 6 239.5 4.2 1.8% Vacant - Developed Parcels 299 Not Sampled Undeveloped Parcels/Open Space 447 Not Sampled Impervious Area