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The upstream site area consists of developed both multi-family and single-family homes. <br /> Considering the site and surrounding area topography and through field observation, <br /> there are nominal amount of tributary runoff entering the site if any.No identifiable <br /> watercourses were observed crossing the site. <br /> Erosion control for the site will consist of filter fabric fences situated on the perimeter <br /> boundary of the site and by the installation of a rock construction entrance. Catch basin <br /> sediment control will be installed for all existing catch basins within the project limits <br /> and downstream in the vicinity of the project.The stormwater runoff from paved <br /> surfaces will be directed to a detention tank by a catch basin conveyance system. The <br /> site will be graded to sheet flow the runoff to the catch basins that will discharge to the <br /> detention tank. Roof runoff will be tight lined to the storm drain system. The detention <br /> tank will discharge to an existing storm drain system installed along the east side of 19th <br /> Avenue SE. <br /> 2. Area of site (square feet): The project site covers 18,412 SQ.FT. (0.4227 of an acre) <br /> 3. Proposed area of land disturbance(square feet): 18,412 <br /> 4. Proposed quantity of excavation(cubic yards): 645 <br /> 5. Proposed quantity of fill (cubic yards): 0 <br /> 6. Total proposed impervious area to be constructed(square feet): 12,632 <br /> 7. Existing site conditions including descriptions of existing topography,existing vegetation,and <br /> existing drainage: <br /> The project site was developed with a single-family house and detached outbuilding. <br /> Existing vegetation consists of landscaping, low brush, grass and bushes. The site is <br /> accessed from 19th Avenue SE. <br /> The site generally flat with some local 2% slopes and contains no wetlands, creeks <br /> or streams. The site is within a neighborhood that consists of both multi-family and <br /> single-family homes. There might be a nominal amount of tributary runoff entering <br /> the site from the north. Existing storm sheet flow over the site toward an existing <br /> storm system on 19th Avenue SE. <br /> Review of all available information: Conducted site review and reviewed available <br /> information from the City of Everett and Snohomish County mapping system and <br /> found no critical areas, erosion or landslide hazard areas within quarter mile of the <br /> project site. Also, there are no streams, wetland or flood areas and no water quality <br /> issues has been identified. <br /> The soil hydrologic types for this site have been Also identified as Type C from the <br /> Snohomish County Soil Survey Map. This soil, Alderwood Urban Complex, this soil <br /> is moderately deep and moderately well drained over hardpan. More detailed soils <br /> information provided as part of the geotechnical engineering evaluation prepared by <br /> Nelson Geotechnical Associates, Inc. <br /> 2 <br />