11/28/2007 Env Bd Packet - Laserfiche WebLink

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Other Issues in Shoreland Overlay Districts for single family residential lots: • Impervious surface coverage cannot exceed 30% of the upland percentage of the lot area. • Only land above the Ordinary High Water (OHW) level of Public Waters and outside of existing watercoarses can be used to meet the lot area standards. • The lot shall provide for the collection and treatment of stormwater. • Measures to be taken for treatment include, but not limited to: 1. Sediment basins, debris basins, distilling basins, or silt traps 2. Debris guards and microsilt basins on stormsewer inlets. 3. Use of skimming devices, or sump catch basins. 4. Favor infiltration on the site through the use of a Storm Water Treatment Train. 5. Create drainage patterns favoring treatment trains including directing drainage away from the lake and into pervious grass yards as part of the treatment train through the use of downspouts and rain gutters. • Limited clearing of vegetation, and the clearing, trimming and pruning of trees is prohibited in the Shore Impact Zone. Natural vege „Ation must be restored where soil disturbance is allowed in the ova icily. Natural Resources Most of the property is classified as aspen forest and wet meadow. The presettlement vegetation inventory classified the entire area as wet meadow. Soils on the site are Dundas Loam. This is indicated as upland soil on the map (Attachment 2). Dundas soils are however, classified as hydric. Hydric soils are those soils that are sufficiently wet in the upper part to develop anerobic (no oxygen) conditions during the growing season. The definition of hydric soils is a soil that formed under conditions of saturation, flooding or ponding long enough during the growing season to develop these anerobic conditions in the upper part. Dundas are typically very deep, poorly drained soils that have a moderately slow infiltration rate. Analysis: Stormwater Pollution Prevention Plan Although the buildable area is less than an acre (threshold level for SWPPP), the following issues should be addressed on the site: • A concrete truck wash -out area must be indicated on the plan, and marked in the field with a sign. • A method of keeping lot sediments on the site must be indicated in the plan, through either daily street sweeping or 5/8 "- clear, rock entrances. (Detail on Sheet 5). • • •