101 E MARINE VIEW DR SEPA 018 - 011 Geotech Report 2025-04-15

NELSON GEOTECHNICAL NGA ASSOCIATES, INC. GEOTECHNICAL ENGINEERS Be GEOLOGISTS Main Office Engineering-Geology Branch 17311—135ih Ave NE,A-500 5526 Industry Lane,N2 Woodinville,WA 98072 East Wenatchee,WA 98802 (425)486.1669•FAX(425)481-2510 (509)665-7696•FAX(509)665-7692 Planning Dept Note: This May 19, 2017 report evaluates a new warehouse building. The SEPA (SEPA18-011) Mr.Adam Clark being reviewed by the 2812 Architecture City is only to remove 2812 Colby Avenue crushed concrete from Everett, Washington 98201 the site. Geotechnical Engineering Evaluation East Marine View Drive Warehouse Building 101 East Marine View Drive Everett,Washington NGA Job No. 988017 Dear Mr. Clark: We are pleased to submit the attached report titled "Geotechnical Engineering Evaluation— East Marine View Drive Warehouse Building — 101 East Marine View Drive — Everett, Washington." This report summarizes the existing surface and subsurface conditions within the site and provides recommendations for the proposed site development. Our services were completed in general accordance with the proposal signed by you on March 23,2017. We understand that a previous warehouse building located within the property was destroyed by a fire. We also understand that the proposed development plan is to construct a warehouse building in the same approximate location. We have been requested to evaluate the site subsurface soil conditions and provide recommendations for the proposed site development. The property consists of an existing commercial business site with paved parking areas surrounding the burnt down structure, located within the central portion of the site. The proposed development for this property will consist of construcing a new warehouse building along with associated pavement and utilities within roughly the same approximate location as the previous building. Stormwater will likely be directed to an existing system associated within the overall commercial development area. We monitored the drilling of two approximately 86.5 to 91.5 foot deep geotechnical borings, utilizing a track-mounted drill rig. Our explorations indicated that the site was generally underlain by very loose/soft to very dense/hard native alluvial soils. We have concluded that the site is generally compatible with the planned development from a geotechnical standpoint. Due to the significant amount of loose soils found to underlie the site, we have recommended that the new structure be founded on modified ground in the form of compacted rock aggregate piers for bearing capacity and settlement considerations. This type of ground modification includes augered or vibratory excavations filled with rock within the foundation and slab areas extending