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Sec. 31 ~4. Adjustment of Storm water Fees. Fees may be adjusted under the following circumstances. In the case of adjustment under paragraphs C through E, information required to justify an adjustment must be' provided by the resident. A. Revision of the storm water utility budget ~ The estimated expenditures for the management of storm runoff will be revised at a frequency and procedure consistent with the sanitary sewer and water utilities. B. Changes in land classification of existing parcels. C. Parcel runoff is significantly different from land classification standard - No adjustments will be made to single family and two family residential parcels. Where the unit runoff generated by a parcel differs from the amount for that land classification by more than twenty percent (20%), the Director of Public Works may adjust the parcel's storm water utility feejn accordance with the following procedure: 1 . Resident applies for reduction and supplies the City with the following information: a. . Site Plan. b. Lot Size. c. Total area of impervious surface. 2. Director .of Public Works determines the difference in parcel unit runoff to land classification standard unit runoff. 3. Percent credit = Difference from steD 2 Land classification standard unit runoff D. Stormwater detention ~ No adjustments will be made to single family and two family residential parcels. An adjustment of up to twenty~five (25%) will be made for those parcels with onsite measures that limit outflow peak events according to the following conditions: 1. Ten percent (10%) credit for parcels that limit peak outflow rates during a 5~year rainfall event to rates comparable to the rates from an unimproved vacant property of the same size. 2. An additional fifteen percent (15%) credit will be given to parcels that limit peak outflow rate during a 1 OO~year rainfall event to rates comparable to the rates from an unimproved vacant property of the same size. It should be noted by the applicant that no adjustment will be made to the existing stormwater utility fee without a skimming device being install with the onsite measures that limit peak outflow events. Skimming shall be considered adequate if a baffle structure extends at least 4 inches below the normal water surface and the velocity of water passing under the baffle does not exceed 0.5 feet per second for the one year rainfall event. E. Wet ponding credit ~ An adjustment of up to twenty~five percent (25%) will be made to the stormwatElr utility fee of a parcel for onsite measures which are owned and maintained by the applicant that effectively reduces the amount of sediments/nutrients 3 bf 5