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T1.888.251.5276 <br /> Bellingham l Arlington I Oak Harbor <br /> www.geotest-inc.com <br /> - 111111111111111111111 <br /> July 24,2019 <br /> Project No.19-0194 <br /> Mukilteo School District <br /> 8925 Airport Road <br /> Everett, Washington 98204 <br /> Attention: Keith Stefanson <br /> Director of Facilities <br /> Regarding: Limited Geotechnical Report Addendum <br /> Horizon Elementary New Portable <br /> Soil Classification and Settlement <br /> 222 W. Casino Road <br /> Everett, Washington <br /> • <br /> Dear Mr. Stefanson: <br /> As requested, GeoTest Services, Inc. (GTS) is pleased to submit this addendum for the <br /> proposed Horizon Elementary School Portable building located at 222 W.Casino Road <br /> in Everett, Washington. As requested, GTS returned to the site to on July 16, 2019 to <br /> conduct Dynamic Cone Penetration (DCP) testing in order to classify the site soils in <br /> accordance with the Minute Man Anchors® Installation Guide. All tests were <br /> conducted to approximately 10 feet beneath the existing site grade. Please see the <br /> attachments for the exploration locations and results. Based upon the blow counts, <br /> the site soils would be classified as 4A for soils down to 10 feet from the existing surface <br /> and 2 for soils greater than 10 feet in depth. <br /> It should be noted that the approximately 1 to 2 inches of settlement that GTS had <br /> referenced in our geotechnical report dated May 3, 2019 was due to the organic <br /> content and wood debris encountered in the test pits during our investigation. In the <br /> mostly anaerobic environment,the settlement due to the decaying material will take <br /> place over decades and is not the typical settlement experienced in months with <br /> loads on compressible soils. This should allow time for periodic inspections and the <br /> tightening of the anchor straps, if necessary. <br />