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<br />I <br />I <br />~ <br />I <br />~ <br />~ <br />~ <br />.. <br />~ <br />, <br />I <br />~ <br />~ <br />~ <br />I <br />~ <br />I <br /> <br />: .] <br /> <br />~ <br />I <br />I <br /> <br />Simons, Li and Associates, Inc. <br />Job. No. 6143J002 <br />Project: Portland Flume Reconstruction <br /> <br />Structure No. 9P -( Sta. 2 + 65): This structure is a wood <br />frame, two story addition to the church building covered with <br />wood siding. The sructure is in good condition and no evidenc2 <br />of structural distress was noted. The addition rests upon a <br />shallow concrete spread footing with concrete stem walls. The <br />building does not have a basement, and appears to have a sus- <br />pended wood floor. The north wall footing is approximately 13 <br />feet from the existing flume wall. <br /> <br />Structure No. lOP - (Sta. I + 95) ~nd Structure No. lIP - (Sta. <br />I + 50): Both of these structures are two story wood frame <br />buildings presently being utilized for building materials stor- <br />age. Both structures are resting on isolated concrete pads <br />setting on or just below the ground surface. Both buildings <br />have suspended wooden floors with the floor joists supported by <br />unmortered masonry block column stem walls. Structure No. lOP <br />is apsproximately 7 feet from the existing flume, and Structure <br />No. lIP is approximately 3 feet from the existing flume. <br /> <br />Temporary Support: It appears that several structures on both <br />the Cascade and Portland Flumes will require some temporary <br />support during construction. Due to the age and condition of <br />some of the structures, it may be necessary to provide perma- <br />nent underpinning systems in some cases. Both temporary and <br />permanent shoring/underpinning can be provided in numerous <br />ways. Some of the more common methods for vertical support <br />are: isolated concrete pads placed in pits hand dug under the <br />existing foundation; pretest piles placed in the same manner <br />and jacked against the existing foundation; inclined vertical <br />bracing notched into the existing footing and bearing outside <br />of the structure; needle (carrier) beams extending through the <br />structure and supported on both ends by wood cribbing, drilled <br />elements, or concrete pads; battered, concrete filled drilled <br /> <br />-9- <br />