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Geotechnical Engineering Report <br /> lierracon <br /> Merrill Creek Operations Base Expansion • Everett, Washington <br /> ' December 14, 2020 ■ Terracon Project No. 81205012 GeoReport. <br /> to another building to the south of the MCOB main building. We also note that KPFF <br /> encountered and documented numerous areas where overexcavation of poor subgrade <br /> ' was necessary during recent concrete pavement construction; these overexcavated areas <br /> are located throughout the bus storage area to the south of the main building and proposed <br /> expansion. <br /> PROJECT DESCRIPTION <br /> ' Item Description <br /> Approx. 16,550 square foot addition to west end of existing operations and <br /> transit coach maintenance building; existing building has a footprint of <br /> approximately 57,500 square feet. <br /> • Building addition will occupy area currently covered with concrete <br /> ' Project Description pavement■ Building addition floor slab will be situated at approximately the <br /> existing grade <br /> ' • Existing building is supported by conventional spread footings. <br /> ■ Existing building ground-floor is an on-grade concrete slab. <br /> Free-Standing Retaining None <br /> Walls <br /> Below-Grade Areas One or more under-coach inspection pits may be constructed. <br /> Pavements Expected to match existing PCC pavements surrounding the expansion <br /> ' area <br /> Applicable Building 2015 International Building Code (2015 IBC) <br /> Code and Minimum Design Load Standard 2010 ASCE Standard ASCE/SEI 7-10 (ASCE 7-10) <br /> Estimated Start of Summer 2021 <br /> Construction <br /> GEOTECHNICAL CHARACTERIZATION <br /> We have developed a general characterization of the subsurface conditions based upon our <br /> review of the subsurface exploration, laboratory data, geologic setting and our understanding of <br /> ' the project. This characterization, termed GeoModel, forms the basis of our geotechnical <br /> calculations and evaluation of site preparation and foundation options. Conditions encountered at <br /> each exploration point are indicated on the individual logs. The individual logs can be found in the <br /> Exploration Results section and the GeoModel layers are presented on the individual logs. As <br /> noted in General Comments, the characterization is based upon widely spaced exploration <br /> points across the site, and variations are likely. <br /> The generalized GeoModel layers consist of the following: <br /> Responsive • Resourceful • Reliable 4 <br />