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Storm Water Management Billing Procedure Formula for Determining Storm Water Charges: Residential Equivalency Factor(REF)X Acreage X Rate ($8.00) STORM=WATERRATES; Vacant ..annual.-..... REF (.2)x $ 8.00= $1.60 x 12/months=$19.20 Vacant formula monthly.....REF (.2)x acreage x $8.00 Residential monthly....REF (1.0)x.33 acres x$ 8.00 = $2.64/month Residential annual $ 2.64 x 12 months= $31.68 /year Commercial X-Light...monthly REF (1.0)x Acreage x $ 8.00 Commercial Light...... monthlyREF (1.6)x Acreage x $8.00 Commercial Medium...monthlyREF (2.3)x Acreage x$8.00 Commercial Heavy.....monthly REF (4.0)x Acreage x $8.00 Land use Classifications REF IMPREVIOUS COVERAGE 1. Vacant .2 0 % 2. Vacant Formula(golf courses, cemeteries etc.) .2 0 % 3. Residential 1.0 25% -30% 4. X-Light Density, Commercial, Industrial, Institutional 1.0 25% - 30% 5. Light Density, Commercial, Industrial, Institutional 1.6 40% - 50% 6. Medium Density, Commercial, Industrial, Institutional 2.3 55% - 60% 7. Heavy Density Commercial, Industrial, Institutional 4.0 70% - 75% When the Storm Sewer utility was originally set up in 1998,the City was set up with 4 property categories: Vacant,Residential, Commercial-Medium & Commercial- Hard. The Commercial-Light category was added May 6,2008. These categories are based on the amount of impervious coverage a property has (NOT the zoning or land use classification). The `standard of practice' in Minnesota uses the average impervious coverage amounts as: Vacant 0% Residential 25% -30% Commercial Light 40% -50% Commercial Med 55% -60% Commercial-Hard 70% - 75% Commercial X-Light 25% -30% Impervious coverage is any area covered by; driveways (any type of pavement and/or dirt),sidewalks,pavers, structures,roofs,awnings, etc, as they do not allow storm water to be absorbed like natural grass,plants, brush, etc. allows) All Residential properties in the City were reviewed and to save the City enormous costs to calculate out every parcel,it was determined that the average residential parcel size was 1/3 (.33) acres in size. �+.. All other parcels are calculated on actual parcel acreage.