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Erosion Control Risk Assessment <br />Slope Soil Tvne and Relative Risk of Erosion: <br />The development area of the parcel slopes from W to E at a slope of <br />approximately 7%, piacing the parcel into the moderate-risk category 2-8%) for <br />erosion due to slope. Soil type for the development area is Alderwood, belonging <br />to hydrologic group "C". This soil type category places the site into the <br />moderate-risk category. The parcel itself is well vegetated with second-growth <br />forest and underbrush at this time, and there is no indication of erosion problems. <br />Location of Critical Areas 1 Resources to be Protected: <br />There is a Type IV stream running west-to-east through the center of the <br />property, and associated wetlands have been delineated along the stream. The <br />stream and wetland will be protected by buffer and NGPAE areas. <br />Location of Fish-Bearinq Streams or Lakes, and Risk: <br />There are no fish-bearing streams or lakes near the property. <br />Potential for Slides or Ground Movement: <br />There is no risk of slide potential within the proposed development area, since <br />the site is moderately sloped. If deep excavations are made, there is a risk of a <br />small-area localized cave-in into the excavation during construction due to sandy <br />soils. <br />Sources of Water for Erosion: <br />The existing source of water for erosion on the buildable portion of the site is only <br />from rainfall falling on the site. <br />Water Qualitv Measures and BMP's to Controi Erosion: <br />The main future risk for erosion will be during the time of construction when land <br />is disturbed to build driveways and homes. BMP's will include, but not be limited <br />to, the use of silt fences/interception trenches along construction cuts. <br />Vegetation wili be preserved wherever possible, but in areas where vegetation is <br />disturbed, the areas will be hydroseeded as soon as construction is completed. <br />Statement of Overall Risk: <br />The overall risk of erosion to this site is moderate due to the soil type (hydrologic <br />group "C") and to slopes 2-8%. The potential for water quality degradation is <br />aiso moderate. <br />( `� <br />