1001 E MARINE VIEW DR SITE WORK AND UTILITIES 2018-01-01 MF Import

SteNen Jacobson JN 98313 Page 2 August 17, 1998 the soils encountered. "Grab" samples of selected subsuriace soils were collected from the trackhoe bucket. The Test Pit Logs are attached to this report as Plates 3 through 7. In the westernmost portion of the site, adjacent to East Marine View Drive, the test pits encountered 6 to 10 feet of fill consisting of loose, brown, silty sand with some organics, gravel, and concrete and asphalt debris. Beneath 6 to 12 inches of topsoil, found below the fill or mostly at the ground surface, the native soils consist of 3 to 5 feet of loose to medium-dense, brown, weathered, silty sand wilh gravel which then became gray and very dense. The silty sands have been giacially consolid�ted and are referred to as glacial till. In our exploretions, the dense to very dense glacial till was encountered to a maximum =xplored depth of 16.5 feet below existing surface grade. The finai logs represent our interpretations of the fieid logs and laboratory tests. The stratificalion lines on the logs represent the approximale bounclaries between soil types at the exploration locations. T�ie actuai transition between soil types rray be gradual, and subsurface conditions can vary between exploration locations. The logs provicle specific subsurface information only at the localions tested. The relative densities and moisture descriptions indicated on the test pit logs are interpretive descriptions based on the conditions observed during excavation. The compaction of backfill was not in the scope of our services. Loosa soil wiil therefore be found in the area of the test pits. If lhis pre:.ents a problem, the i:a�kfiit ��ill need to be removed and replaced with structural fill during construction. Groundwater No groundwater seepage was observed in any of the test pits, however, they were left open for oniy a short time period. It should be noled that oro�ndwater levels vary seasonally with rainfall and other factors. We anticipate that groundwater cc�lc: be found between lhe near-surface, weathered soil and the underlying giacial tiil and in more perm�ahie soil layers or pockets within the till soils, especially durin� the normally wet winter and spring months. CONCLUSIONS AND RECOMMENDATIONS General Based on the test pits and our observations made during our site visit, it is our opinion that the proposed multi-residential development is feasibie on this site from a geotechnical engineering standpoint. The proposed buildings should be supported on conventional foundalions bearing on the dense to very dense glacial till soils. Que to the large size of the buiidings and the deep cuts proposed on the western ends of the buildings, we recommend that no structurai fill be placed under any portion of the buildings due to the potential for differential settlement. Lean-mix concrete could be used beneath footings on the eastern sides of the buildings where the proposed finish floor levels are above the existing ground level. One oF the main geotechnical challenges for this project is the construction of the below-grade parking levels and the proximity of East Marine View Drive to the excavation. Because of the large cuts proposed for the two buildings near the western property line, temporary shoring would be needed unless construction easements can be acquired from the City of Everett. All cuts siopes in ci:�,n cn cu�sui:r,��rs.mc