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Specifications -41Y lek G®oP Ingrnccmrg Inc Real-World Geotechnical Solutions Investigation • Design • Construction Support September 9, 2014 GeoPacific Project No. 12-2726 j,,0/9-6a, Brett Groves Riverside Homes 17933 NW Evergreen Parkway, Suite 370 Beaverton, Oregon 97006 Via email: BGroves @riversidehome.com SUBJECT: GEOTECHNICAL SUMMARY REPORT FERN HOLLOW COURT LOT 5 TIGARD, OREGON Reference: GeoPacific Engineering, Inc., Geotechnical Investigation, Fern Hollow Court Lot 5, Tigard, Oregon, October 4, 2012. GeoPacific Engineering, Inc. is please to submit this summary report of geotechnical compliance for the above-referenced project. We conducted on-call construction observation and testing services during the construction of the project. Our services were performed August of 2014. Field reports summarizing our observations and testing are attached. CONSTRUCTION OBSERVATION During construction, we provided periodic observation as the earthwork contractor, Endicott Woods (EW), installed the vertical pipe piles, in order to verify that adequate depths into competent soils were obtained. We observed that driving conditions in undisturbed native soils was relatively similar for piles in all portions of the site. Based on our observations, the size and spacing of the piles, and the depths of embedment into stiff soils were observed to be in general accordance with the recommendations presented in our report. We observed as EW performed compression testing on two of the piles in different areas of the site. At 150 percent of the design load, one pile deflected a total of 0.035 inches and the other pile deflected a total of 0.100 inches, which meets our recommendation of 0.3 inches of maximum deflection. CLOSING AND LIMITATIONS Based on our observations, the vertical piles have been installed in general accordance with the recommendations presented in our report, and with additional recommendations provided in the field during construction. Our conclusions and opinions as to whether the work essentially complies with the project specifications are based on our observations and experience. The conclusions contained herein represent conditions at the date of this report and apply only to our work with respect pile 14835 SW 72"d Avenue Tel (503) 598-8445 Portland, Oregon 97224 Fax (503) 941-9281 Field Soil Observation Summary Page 1 of 1 Field Soil Observation Summary Project: Fern Hollow Lot 5 /v _ %,C/ / 0 Job number: OR 12-2726 Project address: SW Fern Hollow Court Tigard, OR Daily Reports 8/22/14: GeoPacific Staff Engineer Ben Anderson on site to observe pile installation. Earthwork subcontractor Endicott Woods (EW) on site installing 6" diameter round steel piles 21 feet long. EW is starting the piles with a smaller hammer (about 250-500 lbs) and plans to finish them off with a larger hammer. After conversation with the geotechnical Engineer Jim Imbrie, Riverside Homes, and EW, GeoPacific will return to the site to observe the finishing of piles with the larger hammer. EW has installed several piles to 21 feet beneath the existing ground surface in the central portion of the site but plans to excavate to footing depth and drive the piles 3 to 4 feet further. 4 piles have currently been started. 8/25/14 : GeoPacific Staff Engineer Ben Anderson on site to observe pile installation. EW has installed all piles on the site to depths of approximately 20 feet below the footing depth, leaving 1 foot above the ground surface for the pile caps. I observed as EW applied driving force to the piles with a hammer weighing approximately 1000 lbs. I observed the driving of 5 piles in various areas of the site, at different elevations. The piles consistently moved approximately 3 inches in 10 to 15 seconds. The movement exceeds the anticipated refusal criteria recommended in the geotech report. However, the piles may exhibit adequate capacity. I recommended that two of the piles be compression tested before evaluating other options. 8/26/14: GeoPacific Staff Engineer Ben Anderson on site to observe pile installation. I observed as EW performed compression load testing on two piles. The first pile was located at the SE corner of the proposed residence and the second pile was located 9 feet east of the NW corner of the proposed residence. The piles were loaded in increments to 150 percent of the design load, which is 16 kips. At 150 percent of the design load (24 kips) , the first pile deflected 0.035 inches total and the second pile deflected 0.100 inches total, which meets our recommendations of 0.3 inches maximum deflection. Based on our observations of driving conditions and load testing, all piles on the site have been installed in general accordance with project specifications and our recommendations and are able to support 16 kips per pile. Go back to the task select page for Fern Hollow Lot 5 Go back to the project select page http://192.168.0.1/geopacific/office/view_soilfield_report.pl 9/9/2014 September 9, 2014% 21) GeoPacific Project No. 12-2726 foundations. Observations by GeoPacific were performed to determine, in general, if the work is being performed in accordance with applicable geotechnical recommendations. The fact that any particular work has been observed does not waive the contractor's responsibility for the means and methods of construction, job site safety, or to comply with the contract documents. Locations indicated in our field reports are generally based on construction staking placed by others, or information provided by the contractor at the time of our site visit. Surveying of test locations or locations of site improvements, and establishment/verification of line and grade, are beyond the scope of services provided by GeoPacific. Within the limitations of scope, schedule, and budget, GeoPacific executed the scope of services in accordance with generally accepted professional principals and practices in the field of geotechnical engineering at the time the report was prepared. No warranty, expressed or implied, is made. Sincerely, GEOPACIFIC ENGINEERING, INC. ���O pROFFSS> 1 G1NFE9 �,. ORE ON 414/ 149 23D. A EXPIRES:06/30/20/ Benjamin G. Anderson, E.I.T. James D. Imbrie, G.E., C.E.G. Geotechnical Staff Principal Geotechnical Engineer Attachments: Field Soil Observation Summary 12-2726-Fern Hollow Court Lot 5-Pile Final 2 GEOPACIFIC ENGINEERING, INC.