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and only o family residential parcels. The adjustments allowable in Section 31-4(6) will be made single and two family residential parcels. The City shall review parcels with adjustments once every five years. The review shall consist of an inspection to ensure that the site conditions still exist to meet the requirements of the fee adjustment. Property owners who refuse a site inspection or do not maintain the site conditions to mect the requirements of the fee adjustment shall have the fee adjustment removed. (1)10get. The estimated expenditures for the management of storm runoff will be revised at a freq ncy and procedure consistent with the sanitary sewer and water utilities. 11 (2) lange in Land Classification. Changes in land classification of existing parcels. (3) rcel Runoff. Parcel runoff is significantly different from the land classification standard. Whe the unit runoff generated by a parcel differs from the amount for that land classification by niore than twenty percent, the City may adjust the parcel's fee in accordance with the folio xing procedure: A. Property owner applies for reduction and supplies the City with the following information: 1. Site Plan. 2. Lot Size. i' 3 Total area of impervious surface. B. City determines the difference in parcel unit runoff to land classification standard unit runoff. I C. Percent credit = Difference from Step B Land classification standard unit runoff (4)rmwater Detention /Infiltration. An adjustment of up to 25 percent will be made for thos parcels with onsite measures that limit outflow peak events according to the conditions (5) of this Subsection. A. A ten percent credit for parcels that limit peak outflow rates during a five year rainfall event to rates comparable to the rates from an unimproved vacant property of the same size. B. An additional fifteen percent credit will be given to parcels that limit peak outflow rate during a 100 -year rainfall event to rates comparable to the rates from an unimproved vacant property of the same size. Vet Ponding Credit An adjustment of up to 25 percent will be made to the Stormwater fee of a parcel for onsite measures that are owned and maintained by the applicant that ively reduce the amount of sediments/nutrients that enter the system. It is the responsibility applicant to prove that the wet pond in question meets the following design criteria: A. The volume of the permanent pool ("dead storage") shall be greater than the runoff volume generated from a 2.5 inch rainfall event over the pond tributary area. B. To promote settling and provide space for sediment accumulation, the average depth