9001 AIRPORT RD SNO ISLE SKILL CTR EXPANSION 2009 Geotech Report 2018-01-02 MF Import

I I Subsurjace Fxpbration. Ctolog(c Hozard. ad � Sra-Isk Ski1Ls Ctnter Addition Preliminary Geotechnita!Engineering Report �entt. Washington Projta and Site Condltions l 2.0 PROJECT AND SITti DESCRIPTION I The subject site consists of the existing Sno-Isle Skills Center campus located at 9001 Airport Way in Everett Washington. The site is relatively flat with the main buildings located within t6e central and southem portions of the property, with pazking lots and vehicle access azeas Igenerally being along the northern portion of the property. I The Mukilteo School District is considering additions and renovations to the existing campus that will affect two of the buildings. An approximately 7,050-squaze-foot addition is planned to Building 1, and an approximately 12,000-square-foot addition/new building is planned to � Building 3. The addition to Building 3 will requ've the removal of one building Building 4) and two portable classrooms (Buildings 5 and 6). The asphalt pazking lot will largely remain the same, but will feature new pazking azeas and pazking stall realignment. � 3.0 SUBSURFACE EXPLORATION IOur field study included drilling six exploradon borings at the site on May 14, 2008. The various types of sediments, as well as the depths where tt►e chazacteristics of the sediments I changed, aze indicated on the exploration logs presented in the Appendix. The depths indicated on the logs where conditions changed may represent gradational variations between � sediment types. If changes occurred between sample intervals in our exploration borings, they were interpreted. Our ex�,lorations were approximately located in the field by measuring from lrnown site features depicted on the previously referenced "Site and Exploration Plan.' IThe conclusions and recommendations presented in this report aze based on the exploration borings completed for this study and a review of existing geologic data for the azea. The I number, tocations, and depths of the explorations were completed within site, budgetary, and access constraints. Because of the nature of exploratory work below ground, extrapolation of subsurface conditions between field explorations is necessary. It should be nai�d that differing I subsurface conditions may someticnes be present due to the random nature of deposition and the alteration of topography by past grading and/or filling. 1'he nature and extent of any I variations between the field explora6ons may not become fully evident until construc6on. If variations aze observed at that time, it may be necessary to re-evaluate specific recommendations in this report and make appropriate changes. i I 3.1 Exploration Borinf;s � The exploration borings were completed by advancing a 4.75-inch, insidediameta, hollow- stem auger with a truck-mounted drill rig. During the drilling process, samples were generally obtained at either 2.5 or 5-foot-depth intervals. The borings were continuously observed and Ilogged by a geotechnical engineer from our firm. The exploration logs presenud in the June 11, 2008 ASSOCU7ED 6fR7N SCIENC6S.INC. � � EG/N-EE080I;3A5-Prolenri100B01131F�'iWP �G Z