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J <br /> 1001 Main Street, Suite 305 <br /> aeNeSTARK Vancouver WA, 98663 <br /> FOUNDATIONS P: 360.566.7343 <br /> May 21, 2018 <br /> Mr. Cory Myron <br /> R&R Foundation Specialists <br /> 7704 176th Street SE <br /> Snohomish,WA 98296 <br /> Re: Special Inspection -3212 16th Street, Everett, Washington <br /> Permit No.: b1803-058 <br /> Dear Cory- <br /> I have performed the special inspection of the installation of the helical and push piers per ICC ESR-3969 for <br /> tha ahrnia-rafaranrarl nrniart <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. <br /> The installation was performed by R&R Foundation Solutions certified installers for PierTech Products using a <br /> RS-6 drive head. <br /> The maximum axial load requirement for this project is 26000 lbs ultimate load. The piers were driven to depths <br /> of 9 -18 feet with a minimum installation pressure of 1200 psi. This results in an ultimate axial capacity of <br /> 29160 lbs, exceeding the required ultimate load per the design documents. <br /> Push Pier Installation: The push pier used for installation was a 2 7/8 inch diameter pipe using a 3.5 inch Dual <br /> Bore Cylinder System with a working area of 16.27 square inches. The maximum axial load requirement for this <br /> project is 34000 lbs ultimate load. The piers were driven to depths of 3-18 feet with a minimum installation <br /> pressure of 10000 psi. This results in an ultimate axial capacity of 50000 lbs, exceeding the required ultimate <br /> load per the design documents. <br /> ri<i Summary: <br /> Based on my special inspection and structural observation,the helical and push piers were installed according <br /> to the engineering design load requirements and according to ESR-3969. <br /> Reaards. <br /> r ��1EL WAY <br /> Daniel Stark. P.E. of �'Aste <br /> Stark Foundations, Inc. <br /> ti <br /> Attachments: Drive Log p 2 ,y =• <br /> Helical Driver Torque Chart Driven Pile �C <br /> • r, <br /> 762, 4064_3,, <br /> -EGISTEWW'v <br /> `9sION .014(1 <br /> AL <br /> EXPIRES : JULY 13, 2018 <br /> fr <br /> i4 / <br />