1329 MADRONA AVE Geotech Report 2022-10-25

Subsurface Exploration,Geologic Hazard,and Janowicz Property Geotechnical Engineering Report Everett,Washington Preliminary Design Recommendations drilled piers because open-hole methods are not practical to this depth. A representative from AESI should be onsite to monitor the installation of the piles. We further recommend that pile placement should be accomplished by a contractor experienced in their installation. Because of the variable nature of the subsurface soils, it is inappropriate to give exact pile lengths. However, based upon the cross-sections developed from the borings,we estimate pile lengths to be on the order of 25 to 30 feet. Augercast piles with a minimum diameter of 16 inches will be capable of supporting loads on the order of 25 tons per pile when embedded a minimum distance of 5 feet into the lower,stiff bearing stratum. Allowable design loads may be increased by one-third for short-term wind or seismic loading. Anticipated settlements of pile-supported structures will generally be on the order of%Z inch. 12.2 Lateral Pile Capacity Although the majority of lateral resistance to wind and seismic loading will be generated by the grade beams,the piles will provide an additional capacity of 1.5 tons per pile(applied at the pile top). Piles within 10 feet of another pile along the direction of force should be considered to be in the zone of influence and the lateral capacity of only one of these piles should be used in design. 12.3 Pile/Pier Inspections The actual total length of each pile may be adjusted in the field based on required capacity and conditions encountered during drilling. Since completion of the pile takes place below ground, the judgment and experience of the geotechnical engineer or their field representative must be used as a basis for determining the required penetration and acceptability of each pile. Consequently, use of the presented pile capacities in the design requires that all piles be inspected by a qualified geotechnical engineer or engineering geologist from our firm who can interpret and collect the installation data and examine the contractor's operations. AESI,acting as the owner's field representative,would determine the required lengths of the piles and keep records of pertinent installation data. A final summary report would then be distributed, following completion of pile installation. 13.0 FLOOR SUPPORT Where crawl-space floors are used, a vapor retarder should be provided above the soil surface within the crawl space. if slab-on-grade floors are planned, they may be used over structural fill placed as recommended above or on structural pile and grade beam support. Where moisture migration through floor slabs is to be controlled, floors should be cast atop a minimum of 4 inches of May 10,2018 ASSOCIATED EARTH SCIENCES,INC. NS/Jd-170699E002-2-Projectsl2 01 70649 1KEIWP Page 18