2320 106TH ST SW 2022-08-29 - Laserfiche WebLink

2.0 SITE ASSESSMENT The site elevations range from elevation 560 down to elevation 548 along the eastern property line of the project site. Site grades are such that the site tends to slope at approximately 7 percent from the west to the east and drains into a wetland area along its entire frontage of the eastern property line. Please refer to the site topographic map on the following pages of this report that shows the land cover condition as well as the contour elevations and existing grades on the project site. The site is currently densely covered with trees with several hundred square feet of impervious surface in the southwest corner of the project site, which is minor in nature and will be removed with this development. There are a couple existing outbuildings on the property located to the east of the project site which almost abut the eastern property line of the site but will remain intact with this development. The lot lying to the west of the site is currently developed and drains to the northeast corner of that lot after being detained and treated in a wet pond and wet/detention vault prior to discharge from the site. That site drains to a separate basin and does not drain onto this project site. As mentioned previously, there are large wetlands with 60-foot and 75-foot buffers located immediately east of the project site. These areas will be mitigated for or protected in perpetuity by this project site by not developing on the top of them. The on-site soils are classified as Alderwood urban land complex with 2 to 8 percent slopes. This is a'C'type soil and not conducive for infiltration or stormwater management. 17576.002.doc