5105 CHINOOK DR 2016-01-01 MF Import

. ' . . 2. EXISTING CONDITIONS SUMMARY The site covers approximately 0.30 acres. All of the proposed disturbance area of the exisling site conlains exisfing trees, brush and ground cover. Therefore, all of the proposed impervious surfaces will be considered new NPGIS and PGIS. Approximately 0.09 acres of the site will be impacted by new impervious surfaces with approximately 0.19 acres of the total site being disfurbed as needed for the clearinglgrubbing and restoration o(the existing site. It appears this site has been previously cleared but still contains a few large irees with brush and ground cover. No existing impervious surfaces were found cr, the site. The proposed area of disturbance is in an area that drains to ihe north and east with no significant oN-site areas found to be lributary to this parcel, based on site observations and the site topography prepared by ASPI. The existing road in the Chinook Dr. R.O.W. appears to be graded to contain flows to the west side of the road away (rom this parcel. In addition, the property to the south o(this site is relatively flal and flows are directed more to the east. The flows lhat do flow onto this site from the south are located more to the east of ihe future SFR. Therefore, ihese (lows will not affed this project. No erosion or capacity issues were observed on or around thi�� site. All runoH irom the proposed developed poAion oi this site leaves as sheet flow over the north or east property lines as sheet flow and is collected oHsite in the low"draw" area thal then directs runoN to the north. The soils have been reviewed by Jamie Barierman, the geotechnical engineer for this project who found the soils onsite to be loamy sand with a water table at more iha� 6'. Reter to Ihe 5oil Analysis intormation contained in Appendix A oi this report. The general � site slopes in ihe area oi disturbance are steep with some areas over 33%. The flatter slopes on the site are in the area of non-disturbance along the north and northeastern portions of the property. Based on the existing soil in(ormation and Ihe setbacks of ihe proposed improvements irom any oF ihe property lines there is little potenlial for erosion or sedimentation during construdion assuming the basic BMPs included in the SWPPP are installed and maintained properly Refer to Figure 2 for an existing basin map. Chinook Sf R 12-013 / \�1 Jan 2012 Pagu 4 �•') � .. Y/ ^�i