4800 DOGWOOD DR Geotech Report 2022-10-25

Subsurface Exploration, Geologic Hazards, View Ridge Community Church Addition and Geotechnical Engineering Report Everett, Washington Design Recommendations A representative from AESI should observe the stripped subgrade and be present during placement of structural fill to observe the work and perform a representative number of in -place density tests. In this way, the adequacy of the earthwork may be evaluated as filling progresses and problem areas may be corrected at that time. Our field technicians and engineers are available to aid the owner in developing a suitable monitoring and testing program, such that quality control is adequately provided. 11.0 FOUNDATIONS Spread footings may be used for building support when founded on properly prepared native soils or on approved structural fill placed as previously discussed. We recommend that an allowable bearing pressure of 2,000 pounds per square foot (psf) be utilized for design purposes, including both dead and live loads. An increase of one-third may be used for short-term wind or seismic loading. Perimeter footings should be buried at least 18 inches into the surrounding soil for frost protection. However, all footings must penetrate to the prescribed bearing strata and no footing should be founded in or above loose, organic, or existing fill soils. It should be noted that the area bound by lines extending downward at 1H:1V from any footing must not intersect another footing or a filled area that has not been compacted to at least 95 percent of ASTM D-1557. In addition, a 1.5H:1V line extending down from any footing must not daylight because sloughing or raveling may eventually undermine the footing. Thus, footings should not be placed near the edges of steps or cuts in the bearing soils. Anticipated settlement of footings founded on native soils or structural fill should be less than 1 inch. However, disturbed soil not removed from footing excavations prior to concrete placement could result in increased settlements. All footing areas should be observed by AESI prior to placing concrete to verify that the design bearing capacity of the soils has been attained and that construction conforms with the recommendations contained in this report. Foundations should be provided with perimeter footing drains. Drains should consist of rigid, perforated, polyvinyl chloride (PVC) pipe surrounded by washed pea gravel. The drains should be constructed with sufficient gradient to allow gravity discharge away from the proposed addition. Roof and surface runoff should not discharge into the footing drain system, but should be handled by a separate, rigid, tightline drain. In planning, exterior grades adjacent to walls should be sloped downward away from the proposed addition to achieve surface drainage. August 29, 2016 ASSOCIATED EARTH SCIENCES, INC. SKL11d - KE160351A2 -Projects 120160351 JKEJ WP Page 12