1822 CHESTNUT ST 2017-01-13 - Laserfiche WebLink

2. EXISTING CONDITIONS SUMMARY The site covers approximately 0.28 acres. The existing site contains an SFR, carport, concrete patio, walkway (ail to be removed or replaced), and a landscaped lawn. Access to the site will be from the existing roadway to the east (Chestnut St). Approximately 2,402 sf (0.06 acres) of the parcel will be impacted by new impervious surfaces, with the entire site, approximately 12,197 sf (0.28 acres) being disturbed as needed for the clearing/grubbing and restoration of the existing combined site. The proposed area of disturbance is the entire site. The proposed area of disturbance drains to the north/northeast. Neither the existing roadway to the east nor the existing alleyway to the west drain toward either property. This project will not affect any off-site flows from passing through the combined site as in the existing condition. All of the proposed impervious surfaces for this project will be dispersed on-site and leave the project parcels as sheet flow or naturally infiltrate on-site via shallow swales. Since the parcel has been cleared previously and appear to have been graded the USDA Web-Soil Survey was used to determine the existing soil conditions for the parcel. Refer to Figure 4. The soils are mapped as Alderwood-Urban land complex. The general combined site slopes, in the area of disturbance, are moderate and do not exceed 10 percent. Based on the existing soil information and the setbacks of the proposed improvements from any of the property lines or critical areas 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. Haack Chestnut SFR 15-0118 October 2015 Page 4