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GEOTECHNICAL INVESTIGATION <br /> EVERETT,WASHINGTON <br /> March 2,2018 <br /> sands with variable amounts of silt and gravel. Esperance Sand tends to have more gravel than Vashon <br /> Advance Outwash,which is a typical differentiating characteristic. <br /> Whidbey Formation includes glacial and non-glacial silts,clays,till-like materials and older sediments <br /> that underlie Vashon-age deposits. These materials are typically exposed in bluffs along Puget Sound or <br /> in deeper ravines slightly inland. The sandy facies of Whidbey Formation can resemble Vashon outwash <br /> deposits. <br /> Soil Conditions <br /> Brief descriptions of the soils encountered in the test pits can be found below. Please refer to the test pit <br /> logs for more detailed information. <br /> Test Pits TP-1,TP-5 through TP-7 <br /> TP-i and TP-5 through TP-7 encountered approximately 6 to 18 inches of forest duff underlain by <br /> approximately 2.5 to 4 feet of very loose to medium dense,silty-fine to medium grained sand with gravel, <br /> roots,and local debris(Fill). This layer was underlain by medium dense,fine to medium grained sand <br /> with variable amounts of silt,coarse sand,and gravel(Outwash),which continued to the termination <br /> depths of these test pits. <br /> Test Pits TP-2,TP-9 through TP-13 <br /> TP-2 and TP-9 through TP-13 encountered approximately 2 to 18 inches of forest duff underlain by o to <br /> 3.5 feet of loose to medium dense,silty-fine to medium grained sand with gravel(Weathered Glacial Till). <br /> This layer was underlain by dense to very dense,silty-fine to medium grained sand with gravel(Glacial <br /> Till),which continued to the termination depths of these test pits. <br /> Test Pits TP-3,TP-8, and TP-14 <br /> TP-3,TP-8,and TP-14 encountered approximately 6 to 18 inches of forest duff underlain by <br /> approximately 2.5 to 7.5 feet of loose,silty-fine to medium grained sand with gravel and debris(Fill). This <br /> layer was underlain by medium dense to dense,silty-fine to medium grained sand with variable amounts <br /> of gravel(Glacial Till),which continued to the termination depths of these test pits. <br /> Test Pit TP-4 <br /> TP-4 encountered approximately io inches of forest duff underlain by approximately 5 feet of loose to <br /> medium dense,fine to medium grained sand with gravel(Outwash). This layer was underlain by medium <br /> dense to dense,fine to medium grained sand trace gravel(Outwash),which continued to the termination <br /> depth of the test pit. <br /> Test Pit TP-15 <br /> TP-15 encountered approximately 12 inches of forest duff underlain by approximately 5 feet of loose to <br /> medium dense,fine to medium grained sand trace gravel(Outwash). This layer was underlain by medium <br /> dense to dense,silty-fine to medium grained sand with gravel(Glacial Till),which continued to the <br /> termination depth of the test pit. <br /> 3 <br />