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GEOTECHNICAL ENGINEERING STUDY <br /> PROPOSED COSTCO RETAIL GASOLINE FACILITY <br /> 10200 — 19TH AVENUE SOUTHEAST <br /> EVERETT, WASHINGTON <br /> E-8556 <br /> INTRODUCTION <br /> General <br /> This report presents the results of the Geotechnical Engineering Study completed by Earth <br /> Consultants, Inc. (ECI) for the proposed Costco Retail Gasoline Facility, 10200-19th Avenue <br /> Southeast, Everett, Washington. The purpose of this study was to explore the subsurface <br /> conditions at the site, and based on the conditions encountered, develop geotechnical <br /> recommendations for the proposed site development. The general location of the site is <br /> shown on the Vicinity Map, Plate 1 . <br /> Project Description <br /> A schematic representation of the facility at the time of our study, and our exploratory <br /> locations are approximately as shown on the Boring Location Plan, Plate 2. We understand <br /> =he proposed fueling facility will be located on the northeast corner of the property, in the <br /> existing asphalt paved parking lot. The existing pavement areas around the development will <br /> remain; however, there will be some modifications to the landscaping areas and vehicle access <br /> routes. <br /> Construction of a freestanding fueling canopy, six fueling stations, and installation of three <br /> 20,000-gallon underground storage tanks are planned as part of the development. Concrete <br /> pavements are also planned as part of the facility. Construction of a 6 foot by 12 foot <br /> controller enclosure is planned to the northeast of the fueling canopy. We understand <br /> excavation depths for the proposed underground storage tanks will be approximately twenty <br /> (20) to twenty-five (25) feet. <br /> A typical column dead load reaction is 4 kips and a typical live load reaction is 16 kips. <br /> Design overturning moments on the canopy will be based on recommended wind and seismic <br /> loading for the area, and should be addressed by the structural engineer. We estimate footing <br /> loads for the proposed controller enclosure will be less than 1 kip per lineal foot. <br /> If any of the above design criteria are incorrect or change, we should be consulted to review <br /> the recommendations contained in this report. In any case, ECI should be retained to perform <br /> a general review of the final design. <br /> Earth Consultants, Inc. <br />