12728 19TH AVE SE BASE FILE Geotech Report 2025-07-29

I May 28, 2007 Proposed Office Building L&A Job No. 7A053 Page 5 GROUNDWATER CONDITIONS Groundwater seepage was not encountered by any of the test pits excavated on the site. The site Iis underlain at shallow depths by a very-dense, weakly-cemented, fresh till deposit of extremely low permeability. This fresh till deposit would perch stormwater infiltrating into the more permeable surficial soils. The perched near-surface groundwater may dry up completely during the dryer summer months and accumulate and rise during the wet winter months. The depth to and the amount of perched groundwater would fluctuate depending on the season, precipitation, ground vegetation cover,site use, etc. I DISCUSSIONS AND RECOMMENDATIONS IGENERAL Based on the soil conditions encountered in our subsurface explorations, it is our opinion that the site is suitable for the proposed development of the site from the geotechnical engineering viewpoint, provided that the recommendations in this report are fully implemented and observed during construction. The loose topsoil and medium-dense weathered soils should be completely stripped within the building pads of the proposed office building, the paved parking lot, the driveways, and in areas where structural fill is to be placed. The underlying fresh till soils are very dense, and are capable of providing adequate foundation support to the proposed building, parking lot and driveways. 111 Conventional footing foundations con structed on or into the underlying very-dense till soils or on 111 structural fill constructed over these competent basal soils may be used to support the proposed building. Structural fill,if required for site should beplaced on proof-r olled,p olled, unyielding, undisturbed, firm, fresh till soils following the stripping of the surficial unsuitable soils. I LIU & ASSOCIATES, INC. I