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Everett Duplex Foundation Repair/20188 June 22, 2020 <br /> Comment Response Page 2 of 3 <br /> 4. A geotechnical evaluation has been prepared by Nelson Geotechnical Associates, Inc., dated <br /> February 28,2020. The"Conclusions and Recommendations"on page 5 state that pin piles should <br /> support the existing building, with the minimum extent being the western portion. The <br /> Foundation Plan on Sheet 3X only provides piles along the existing western wall. The pile <br /> improvements should extend past the point of settlement to where adequate soil bearing occurs <br /> (i.e., past point of settlement) to prevent draping of existing foundation and overloading of the <br /> piles at the termination of the improvements. See IBC Section 1603.1 and 1604.4. <br /> Piles have been added along the north and south return walls per the geotechnical engineer's <br /> recommendations.Refer sheet S2.1 and the revised geotechnical letter. <br /> 5. Page 7 of the geotechical report states that the piles shall have a maximum capacity of two tons <br /> (4,000 Ibs) when driven to refusal (less than one inch of movement under continuous driving). <br /> This installation criteria should be specified in the structural general notes. <br /> The geotechnical engineer approved the use of 6000 lbs capacity in their revised letter. This <br /> information has been added to the structural notes on 51.1. <br /> 6. Continuing with the previous comment, page 7 states that the piles should extend at least 5 feet <br /> into competent native soil. Page 5 indicates a fill layer of approximately 11 feet, resulting in a <br /> minimum pile length of 16 feet. The minimum pile length should be confirmed and specified in <br /> the structural drawings. <br /> This information has been added to the plans. <br /> 7. Page 67 of the geotechnical report states that the piles should be minimum 2-inch extra strong <br /> galvanized pipe. The structural notes and details on Sheet S-1.0 should be revised to address the <br /> following: <br /> a. The notes should specify Grade B pipe. <br /> b. Detail 1/S-1.0 specifies standard pipe. The detail should be revised to extra-strong pipe. <br /> c. The notes and details should specify galvanized pipe. <br /> A. Grade A or B pipe is acceptable.This has been added to S1.1. <br /> B. Detail no longer exists. <br /> C. Galvanized pipe is now specified on S1.1. <br /> 8. The pile-supported foundation at the garages includes a 4-inch slab-on-grade (SOG) that is <br /> presumed to overlap the concrete footings. Settlement of the slab will place increased dead and <br /> live loads on these foundations. Calculations substantiating the foundation design to support <br /> additional loads should be submitted for review. Alternatively,the foundations should be isolated <br /> from the SOG. See IBC Sections 107.2.1, 1604.1,and 1604.4. <br /> The garage has been removed from the design.There will be no slab-on-grade in this project <br /> anymore. <br /> 9. Details 1/S-1.0 and 2/S-1.0 should specify vertical reinforcement in the walls. See IBC Sections <br /> 1901.2 and 1901.5(3),and ACI 318-14 Section 13.3.5. <br /> 250 4th Avenue South,Suite 200 <br /> Edmonds,WA 98020 <br /> ®� ph.425.778.8500 I f.425.778.5536 <br /> ENGINEERING www.cgengineering.com <br />