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City of San Leandro Stormwater Fee Report <br />Final Report 3. Rate Structure Analysis <br /> <br />HF&H Consultants, LLC Page 8 March 12, 2024 <br />according to their Impervious Surface Area characteristics. To account for various sizes of non-residential <br />properties, the SFE for each land use category is calculated on a per-acre basis, so size of the parcel can <br />be a variable. The SFE-per-acre is computed for each non-residential category using the formula below, <br />taking into account the average Impervious Surface Area for each non-single family category as sampled <br />and summarized in Table 5. <br /> <br />𝑅𝐸𝐸 𝑃𝑒𝑙 𝐴𝑐𝑙𝑒=(43,560 square feet per acre) π‘₯ π΄π‘™π‘’π‘™π‘Žπ‘’π‘’ % 𝑙𝑒 𝐼𝑙𝑙𝑒𝑙𝑙𝑖𝑙𝑙𝑙 π΄π‘™π‘’π‘Ž <br />3,067 square feet of Impervious Areas per SFE (from Table 3) <br /> <br />Table 4 shows a summary of resulting parcel SFEs for each non-Single Family land use category. <br /> <br />Table 4. Summary of SFEs per Acre for Each Non-Single Family Land Use <br /> <br /> <br /> <br />CALCULATION OF ESTIMATED IMPERVIOUS SURFACE AREAS – BY <br />LAND USE <br />For most land use categories, a sample of parcels was analyzed using the Alameda County’s Geographic <br />Information System (GIS) to determine the average percentage Impervious Surface Area. Table 5 below <br />shows the results of that analysis. <br /> <br />Table 5. Impervious Area Sampling Results <br /> <br />Non-Single Family <br />Land Use Cateogry Acres % Impervious <br />SFE per <br />Acre <br />Apartments/Condos 1,288 71.3%10.13 <br />Commercial/Municipal 2,258 87.6%12.44 <br />Schools 150 55.4%7.87 <br />Parks 72 16.6%2.36 <br />Golf Courses 240 1.8%0.25 <br />Vacant - Developed Parcels 176 1.8%0.25 <br />Land Use <br />Category # of Parcels <br /># of Parcels <br />Sampled <br />Total Acres <br />Sampled <br />Total Acres <br />Impervious <br />Area <br />Single-Family Residential <br />Small < 3,200 sq. ft.1,193 36 1.9 1.3 1,602 sq. ft. <br />Medium 3,200 to 7,200 sq. ft.16,111 484 58.7 33.7 3,067 sq. ft. <br />Large > 7,200 sq. ft.3,094 93 20.7 9.8 4,617 sq. ft. <br />Non-Single-Family Residential <br />Apartments/Condos 2,036 61 49.2 35.1 71.3% <br />Commercial/Municipal 1,929 58 22.1 19.4 87.6% <br />Schools 19 19 151.3 83.9 55.4% <br />Parks 35 35 90.8 15.1 16.6% <br />Golf Courses 6 6 239.5 4.2 1.8% <br />Vacant - Developed Parcels 299 Not Sampled <br />Undeveloped Parcels/Open Space 447 Not Sampled <br />Impervious Area