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22 <br />Least susceptible wetland includes severely degraded wetlands. Examples of <br />this condition include cultivated hydric soils, dredge/fill disposal sites and some gravel <br />pits. <br />Exceptions. Rate control criteria of division (5) may be waived if the site <br />discharges directly to a water body with large storage capacity (such as a public water) <br />that has a time-to-peak elevation greater than that for an on-site pond and the volume <br />discharged from the on-site pond is negligible, relative to the volume of runoff entering <br />the water body. <br />(7)(8) Design criteria. Best Management Practices shall be designed in accordance <br />with the following standards: <br />(a) Infiltration BMPs. Infiltration BMPs must be designed to provide:The City <br />adopts by reference RCWD Rules C.9.(a) as amended. <br />1. Adequate pretreatment measures to remove sediment before runoff enters <br />the primary infiltration area; <br />2. Drawdown within 48-hours or 72-hours from the end of a storm event, for <br />surface or sub-surface features, respectively. Soil infiltration rates shall be based on the <br />appropriate HSG classification and associated infiltration rates (Table 5). Infiltration area <br />will be limited to the horizontal areas subject to prolonged wetting; <br />(8) <br />(9) Table 5. Soil Infiltration Rates. <br />(10) <br />SG <br />(11) S <br />oil Tecture* <br />(12) Corresponding <br />Unified Soil Classification** <br />(13) Infil <br />tration Rate <br />[in/hr] <br />(14) (15) G <br />ravel <br />(16) S <br />andy Gravel <br />(17) S <br />ilty Gravel <br />(18) <br />W <br />(19) Well- <br />graded gravels, sandy <br />gravels <br />(20) 1.6 <br />3 <br />(21) <br />P <br />(22) Gap- <br />graded or uniform <br />gravels, sandy gravels <br />(23) <br />M <br />(24) Silty <br />Gravels, silty sandy <br />gravels <br />(25) <br />W <br />(26) Well- <br />graded or uniform <br />sands, gravelly sands