9509 7TH AVE SE 2025-07-28 - Laserfiche WebLink

2. EXISTING CONDITIONS SUMMARY The site covers approximately 0.40 acres. All of the proposed disturbance area of the existing site contains hard surfaces, grasses, and few trees. Therefore, all of the proposed impervious surfaces will be considered new or replaced NPGIS and PGIS. Approximately 0.08 acres of the site will be impacted by new impervious surfaces with approximately 0.16 acres of the site being disturbed as needed for the clearing/grubbing and restoration of the existing site. This site has been previously cleared and graded and contains an existing SFR, driveway and detached shop/shed. The proposed area of disturbance is in an area that drains to the northeast with no significant off-site areas found to be tributary to this parcel, based on site observations and the site topography available on-line. The existing roadways contain flows within the R.O.W. and the only area contributing any flows is form the SFR lot to the south and only a portion of the existing landscaping appears to contribute flows to this site. Therefore, it appears these flows will not affect this project. No erosion or capacity issues were observed on or around this site. All runoff from the proposed developed portion of this site leaves as sheet flow over the north property line as sheet flow and is collected offsite in the roadway that then directs runoff to the east. The soils have been reviewed and found to be Alderwood-Urban Land Complex type soils. The general site slopes in the area of disturbance are flat at approximately 2% or less. Based on the existing soil information and the setbacks of the proposed improvements from any of the property lines there is little potential for erosion or sedimentation during construction assuming the basic BMPs included in the SWPPP are installed and maintained properly. Refer to Figure 2 for an existing basin map. Fordham SFR 12-0906 Oct. 2012 Page 4