11030 7TH AVE SE 2018-01-02 MF Import

,n�Zx aH� H ti tH" x H t7 O H HOil tT! O OY nC MHz HH O�H o U ra 19� ca rz-3 0 CO Mr. John McConaghy April 28, 1989 The western parcel of the property gently slopes down toward the North Creek with elevations ranging between 550 and 568. The site then rises up from the creek towards the eastern portion with elevations between 550 and 562. North Creek runs in a southerly direction in the central portion of the site. We did not observe any standing water on the site at the time of our study, except the creek area which will not be a part of this development and is on property dedicated to the City of Everett. The site features mentioned above along with the proposed building and parking locations are shrnvT.on the attached Exploration Location Plan, Figure 2. Subsurface Our subsurface exploration indicates that the property is generally underlairi'.)y rokt-'•+ely firm native sandy, glacial till soils. Some dense, relatively clean, outwash sar. s and gravels were also noted in some of our test pits below the till soils. Also, very dense sandstone like material was noted in Test Pit TP-10. However, natural soils on the site were p;edominantly firm glacial till soils corsisting of unsorted mixtures of gravel, silt and sands below the surficial topsoil and looser silty sands and weathered soils. The thickness of organic and unsuitable soils are estimated to be between 1 to 3 feet and are generally, thicker near the creek. Two test pits, TP-8 and TP-10, encountered four and two feet of localized loose fill soils, respectively. Some of the soils encountered in our test pits were generally moist. More detailed descriptions of the subsurface conditions are presented in the attached Test Pit Logs, Figures 4 through 11. Groundwater Groundwater was observed at relatively shallow depths in most of our test pits. We expect that the groundwater seepage will be encountered at relatively shallow depths below the entire site since the property is situated near the North Creek drainage area. Also, excavations made for the swimming pool will likely encounter water seepage. DISCUSSION AND RECOMMENDATIONS GenerTl Based on our subsurface exploration and geotechnical analyses, it is our opinion that the subject site may be developed with multifamily residential buildings as planned, provided the recommendations presented in this report are incorporated into the project design and construction. There are three main geotechnical features at the site. These are as follows: 1. Surface and Subsurface Water Control: Moderate to large amounts of surface and subsurface water are expected at the site and will need to be controlled both during construction and for long term project performance. Project No. T-1005 Page No. 4