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Subsurface Exploration,Geologic Hazard,and <br /> lanowicz Property Geotechnical Engineering Report <br /> Everett,Washington Project and Site Conditions <br /> 4.3 Hydrology <br /> Groundwater seepage was encountered in exploration boring EB-1 at a depth of approximately <br /> 7 feet and in exploration boring EB-2 at a depth of about 9 feet. The observed groundwater <br /> occurred in colluvium and landslide deposits. We interpret the encountered groundwater as <br /> being representative of a shallow groundwater condition known as interfiow. interflow <br /> generally occurs during the months of October through June when surface water infiltrates <br /> down through a relatively permeable topsoil layer and becomes trapped atop a very <br /> low-permeability deposit. Fall rains begin recharging the interflow zone, and once this zone is <br /> saturated, the shallow groundwater commonly flows laterally atop the low-permeability layer. <br /> The interflow will accumulate in topographic lows and form wetlands or surface <br /> channels/streams that may return to interfiow water farther downslope. Potential interflow <br /> . would likely follow the topography and flow in primarily a northwest direction. Groundwater <br /> conditions should be expected to vary over time and due to seasonal influences. <br /> • <br /> May 10,2018 ASSOCIATED EARTH SCIENCES,INC. <br /> NSAfd-170649E002.2-Profects1201706491KE1WP Page 5 <br />