10632 7TH AVE SE Geotech Report 2025-07-28

I 1 June 6,2008 Serenity Meadows L&A Job No. 8A017 Page 5 mounted backhoe to depths from 5.5 to 13.0 feet. The approximate locations of the test pits are shown on Plate 2 - Site and Exploration Location Plan. The test pits were located with either a tape measure or by visual reference to existing topographic features in the field and on the topographic survey map, and their locations should be considered only accurate to the measuring method used. A geotechnical engineer from our office was present during subsurface exploration, who examined the soil and geologic conditions encountered and completed logs of test pits. Soil samples obtained from each soil unit in the test pits were visually classified in general accordance with United Soil Classification System, ,a copy of which is presented on Plate 3. Detailed descriptions of soils encountered during site exploration axe presented in test pit logs on Plates 4 through 7. A layer of loose organic topsoil,from 10 to 21 inches thick, was encountered by most of the test pits, except Test Pits 2,3 and 6 excavated in the backyard in which a layer of fill from about 1.3 to 9.0 feet thick was encountered. This layer of fill is consisted of gravelly,silty,fine to medium sand with occasional cobble. This layer of fill is medium-dense to dense,obviously bad received some degreeof compaction effort. The fill,however, was underlain by a discontinuous layer of relic topsoil, about 12 inches thick, with occasional to abundant roots, indicating the topsoil had not been completely strippedprior to the fillplacement. Underlying the fl1/relic topsoil is a layer P y PPe y� P of weathered soils of medium-dense,brown to light-brown, silty fine sand with a trace of gravel, about 1.4 to 2.5 feet thick. In Test Pits 1, 2, 5, 6 and 7 in the eastern portion of the to-be- developed area, this layer of weathered soils is underlain by a fresh till deposit of light-gray, very-dense,gravelly, silty, fine sand with occasional cobble. In Test Pits 3 and 4 in the western Iportion of the to-be-developed area, the layer of weathered soils is underlain by a fresh advance outwash soils of gray,medium-dense to dense, gravelly,fine to coarse sand. I 1 LEIU & ASSOCIATES, INC.