6101 ASSOCIATED BLVD BASE FILE 2017-06-05

Underwood Gartland Everett, LLC ES-2232.02 February 6, 2015 Page 6 Modular Block Walls and Rockeries Modular block walls or rockeries may be utilized throughout the site, and at the location of the proposed stormwater ponds. In our opinion, the use of modular block walls or rockeries is feasible for this project and the proposed application. A formal wall design should be prepared by the geotechnical engineer based on the final wall type and heights during final engineering. Foundations Based on the results of our study, the proposed warehouse structures can be supported on conventional spread and continuous footings bearing on at least two feet of structural fill. As determined necessary by the geotechnical engineer during construction, re-compaction of existing structural fill soils or overexcavation and replacement with new structural fill may be recommended. Assuming the building foundations will be supported as described above, the following parameters can be used for design: • Allowable soil bearing capacity 2,500 psf • Structural Fill Depth 2 Feet Min. (below footings) • Structural Fill Zone Width 1 Foot Min. (additional) Beyond Ftg. Perimeter • Passive earth pressure 350 pcf (equivalent fluid) • Coefficient of friction 0.40 A one-third increase in the allowable soil bearing capacity can assumed for short-term wind and seismic loading conditions. The above passive pressure and friction values include a factor-of- safety of 1.5. With structural loading as expected, total settlement in the range of one inch is anticipated, with differential settlement of about one-half inch or less over a span of approximately 50 feet or one column bay spacing. Slab-On-Grade Floors Typical warehouse slab-on-grade loading of 350 psf is assumed for this project. Slab-on-grade floors for the proposed building should be supported on a suitable four-inch capillary break material underlain by compacted structural fill. Structural fill in slab-on-grade areas should be compacted to a minimum relative compaction of 95 percent throughout the upper one foot of subgrade. Unstable or yielding areas of the subgrade should be recompacted or overexcavated and replaced with suitable structural fill prior to construction of the slab. Cement treatment of the subgrade soil can also be considered for subgrade stabilization. The building slab-on-grade areas should be provided with a minimum four inch capillary break. Capillary break soils must consist of a granular free draining crushed rock or crushed gravel material that contains less than five percent fines (percent passing the #200 sieve, based on the minus three-quarter inch fraction). In areas where slab moisture is undesirable, installation of a vapor barrier placed below the slab should be considered. If a vapor barrier will be utilized it should be a material specifically designed for that use and should be installed in accordance with the manufacturer's specifications. Earth Solutions NW, LLC