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REDMOND & ASSOCIATES <br /> <br />March 5, 1999 <br /> <br />Mr. Dennis Tower <br />K2 Design & Construction <br />1186 Dawn Ddve <br />Stayton, Oregon 97383 <br /> <br />FILE <br /> <br />Project No. 435.001 .G <br />Page No. ~ <br /> <br /> NAR 2 ~l 1999 j~ <br />MARION COUNTY <br />BUILDING INSPECTION <br /> <br />Dear Mr. Tower: <br /> <br />Re: Geotechnical Consultation Services, Evaluation of Driven Pile Support and Capacity, <br /> Proposed Addition to Detroit Lake Marina Building, 115 Breitenbush Road, Detroit <br /> (Marion County), Oregon <br /> <br />Introduction <br />In accordance with the request of Mr. Dennis Tower of K2 Design & Construction, we have <br />completed our Geotechnical Engineering evaluation of the use of driven steel piles for support of <br />a new building aedition to the above subject existing building, We understand that present p~ans <br />call for the construction of a new building addition to the existing marina building which will be <br />located to the northerly and/or easterly direction from the existing structure which is presently <br />sited adjacent to Breitenbush Road. Additionally, the new addition will be a single- and/or two- <br />story structure constructed of wood-framing and extending out over an existing moderately steep <br />slope area overlooking the reservoir. Structural loading of the building addition is expected to be <br />fairly typical and light for this type of wood-frame construction. The area planned for the new <br />building addition presently contains and existing wooden deck which is supported by shallow <br />concrete pier pads and wooden posts. <br /> <br />Site Conditions <br /> <br />Specifically. on February 24, 1999, we were present at the site and performed a detail~ site <br />reconnmssance of the existing slope area located directly below the existing woode~ structure. <br />The slope is characterized by moderate to steeply sloping terrain descending down towards the <br />reservoir and is estimated to be at a gradient of about 100 percent of more. The subsurface soils <br />and/or bedrock materials exposed along the face of the slope consist of undifferentiated <br />tuffaceous sedimentary recks, tuffs, and basalt materials of Miocene and Oitgocane age. A <br />geologic description of these materials includes heterogeneous assemblage of continental, <br />largely volcanogenic deposits of Basalt and basaltic andesite, including flows and braceia, <br />complexly interstratified with epilastic and volcaniciastic deposits of basaltic to rhyodatic <br />composition. <br /> <br />1155 13th Street, SE * Salem, OR97302 * Phone: 587-9741 * Fax: 364-1260 <br /> <br /> <br />