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Project No. 435.001.G Page No. 2 :3udng our site reconnaissance, we did not observe any s~gns or evidence of gross slope instability or landsliding although some minor surface erosion is present. Vegetation across the slope consists pfimadly of a light to moderate growth of grass and weeds as well as some brush and occasional trees. Conclusions and Recommendations Based on the results of our recent site reconnaissance, a review of available geologic maps and reports for the area of the subject site as well as our present undemtand of the project, we are of the ooinion that the site is suitable for the planned new building addition provided that the following recommendations are prepedy incorporated into the design and construction of the project. in general, we recommend that the now building addition be supported by ddven steel piles consisting of a W8x28 pile section or larger. Due to the anticipated rocky and/or bouldery nature of the existing subsurface soit materials located along the slope area. we envision that the pile tips will require tapered and/or beveled tips to allow for adequate pile penetrations and minimize damage to the pile tip. All piles shall ~e ddven to an ultimate pile capacity of at least 210 kips per pile. Additionally, all piles shall be driven to the specified ultimate capacity using ddving cdteria developed from the ODOT Gates Equation with a factor of safety of 3.0. However. we recommena a minimum ~)ile embedment of at least twenty (20) feel beneath existing site grades. Lateral loads may be resisted by passive earth pressures against the embedded portion of the driven steal piis sectio~ based on an equivalent fluid density of about 150 ~)ounds per cubic foot (pcf). Settlements of driven steel oiles placed and constructed in accordance with the above recommendations should generally be well within the tolerable limits for this type of wood-frame structure and generally tess than about 1/2-inch. In addition to the above, we recommend that all aspects of the pile driving and installation wo~ ~3e monitored by the Geotechnical Engineer. Closure The services performed by the Geotechnical Engineer for this project have been conducted with that level of care and skill ordinarily exercised by members of the profession currently practicing in the area under similar budget and time restraints. No warranty, either expressed or implied, is made. REDMOND & ASSOCIATES