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r <br /> M 0 . . :f <br /> 4 .u.. It ..r.,w <br /> P P. -- <br /> t <br /> N. �. - a ii <br /> . . <br /> ' �'-" !P..-fie''' <br /> _ 4^ •- <br /> ... <br /> View at the Southeast Corner — Two Piers at this Side <br /> The helical piers will be machine driven with a hydraulic head and will use the low profile 4036 <br /> brackets Or the 4040 flat tops depending on the depth of the foundation The piers should not <br /> be spaced more than 7-feet apart and the pier locations are shown in the attached repair plan. I <br /> have also shown the addition of steel angle placed on top of the brackets to spread the lifting <br /> force under the edge of the pad. <br /> I have calculated that the pressure used to drive the helical piers should be at least 5,000 <br /> pounds of equivalent torque capacity under the pad using generator load of about 10,000 <br /> pounds and dead loading consistent with the materials used. The pipe pier shafts will be <br /> supported for their full length against buckling. They will be installed in consolidated marine <br /> sediments or glacial till soil typical in this area. This soil has no acidic conditions that would <br /> deteriorate the steel piers. I anticipate that the hard bearing layer is present about 20 to 25 feet <br /> below the footings based on pier installation at other nearby locations. <br /> In addition to the helical piers and brackets, I have shown the addition of an expansive <br /> polyurethane fill to be injected under the pad after it is lifted to fill any voids created by the lift. <br /> This will ensure that the bearing capacity is maintained_ <br /> In conclusion, I found that the generator pad at the Amazon Facility at 607 Riverside Road in <br /> Everett, Washington has expel e ced up to 4%-inches of settlement at the south•end of the pad. <br /> Please refer to my attached repair plan for lifting and stabilization recommendations possible <br /> with a total of four hydraulically driven helical piers and support brackets with steel angle <br /> extensions two sides of the foundation. <br /> I have enjoyed working with you on this project. If you have any additional questions, <br /> comments, or concerns please feel free to call. <br /> cejoi."41.4414t4titt <br /> .II - - 1 tz, (-)4 (c)/2..u. <br /> Few ' I. _ .,. <br /> I %mofh ,1 de P w. <br /> . 1 `JO\':A1.\:;- <br /> EXFkL. 6 19 f.1.5 1 <br />