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, <br /> . <br /> 4001 Main Street,Suite 305 <br /> STARK Vancouver WA,98663 <br /> F O U N DATI O N S P: 360.566.7343 <br /> January 24,2018 <br /> Mara Wiltshire <br /> 823 Grand Avenue / <br /> Evere �/ � � <br /> !� <br /> Re: Special Inspection-823 Grand Avenue,Everett,Washington <br /> Permit No.: B1711-015 <br /> Dear Mara- <br /> I have performed the special inspection of the installation of the helical piers per ICC ESR-3969 for the above-referenced project. <br /> Helical Pier Installation: <br /> The helical pier used for installation was a 2 7/8 inch diameter pipe with a 10 inch diameter helix configuration. The installation <br /> was performed by R&R Foundation Solutions certified installers for PierTech Products using a RS-6 drive head. <br /> The maximum axial load requirement for this project is 24000 Ibs ultimate load. The piers were driven to depths of 2-3 feet with <br /> a minimum installation pressure of 1100 psi. This results in an ultimate axial capacity of 26730 Ibs,exceeding the required <br /> ultimate load per the design documents. <br /> Summary: <br /> Based on my special inspection and structural observation,the helical piers were installed according to the engineering design <br /> load requirements and according to ESR-3969. <br /> Please give our office a call if you have any questions or need further assistance. <br /> �Q'oF w�Lsr�,���, <br /> � c <br /> Regards, � �� ���r� <br /> �--� �--� <br /> Daniel Stark, P.E. r� �� <br /> Stark Foundations, Inc. � 4os43 <br /> Attachments: Drive Log �SSI�NAL�� <br /> RS-6 Torque Chart <br /> EXPIRES : NLY 13, 2018 <br /> � <br /> �-- <br />