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Report
Jun. 27. 2011 10:44AM No. 1899 P. 1 c4 1 5 .5trC s Goof ` ` the fit/ Engineering, Inc. �, � 2ee�►Q�� C Pkiio SW 6957-;.Z6 r l O G �d Sherwood, O egon�97140 Tel (503) 626-4455 • Fax (503) 6254406 June 27, 2011 Project No. 03 -8449 Attention: Blake Agate Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 Fax 503 - 387 -7615 FOUNDATION EXCAVATION REVIEW LOT 75 — ARLINGTON HEIGHTS NO. 3 CITY OF TIGARD, OREGON GeoPacific Engineering Inc. visited the site last week to review the single family home foundation layout on Lot 75. We understand that the proposed building is a two -story home. In our opinion, the observed subgrade is generally adequate for support to an allowable bearing pressure of 1,500 psf. The expected maximum anticipated total and differential footing movements (generally from soil expansion and/or settlement) are 1 inch and 3 / inch, respectively, over a span of 20 feet. At the time of our first site visit, the upper portion of the excavation was benched 2 to 4 feet into the 3H:1 V fill slope. We requested about 4 feet of deepening at the back of the home to get down to a 2H:1V setback from the face of the soil filled Lock -n -Load retaining wall below the home in order not to surcharge it. Once the excavator deepened the back footing line he encountered straw and soft topsoil and had to remove an additional 3 feet at the southeast corner. After our second site visit, soils exposed in the bottom of the foundation excavation consisted of predominantly very stiff silt fill with some rock and a small area of stiff native silt at the SE corner. These soils are considered adequate to support the planned foundation loads. Due to silty clay soils encountered throughout the site, all foundations should incorporate appropriate drainage measures. Crawlspaces should be provided with a low -point drain and pass through pipes should be installed through footings which would otherwise restrict water flow to the low -point drain. Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after excavation. We observed some placement of crushed aggregate to protect the subgrade from wet weather. If footing bearing soils become saturated or disturbed, any softened soil or slough should be removed and replaced with crushed aggregate or additional concrete. In general, footing excavations should be cleaned such that no more than about'/ inch of loose soils is present prior to pouring concrete. :; . Jun. 27. 2011 10:44AM No. 1899 P. 2 o /� c� _GeoPacific Engineering, Inc. Job No. 03-8449 Lot 75 Arlington Heights No. 3 Our work scope pertains to a geotechnical engineer's foundation excavation review only and the conditions existing and exposed at the time of our site visit. Within the limitations of scope, schedule and budget, GeoPacific attempted to execute these services in accordance with generally accepted professional principles and practices in the fields of geotechnical engineering and engineering geology at the time the report was prepared. No warranty, express or implied, is made. If you have any questions, please call. Sincerely, GeoPacific Engineering, Inc. 8 ° PR Opes t��GIN%sf O, 4 4.1 47E •i 'e OREGON EXPIRES: 06/30/2043 James D. Imbrie, G.E. Geotechnical Engineer • 1 , i - ..... __,, I I 1 :" 595 CALC I X I I 598 X I CALC Lri 22 2110 � 2109 23.83' @BC 2111 LOT 75 .. 1 ®BC 2128 T W --�c ®INT WALL • 2112 0 U , 27.17' ® 2113 • 8 Q ABC o -�� .--�- �_ . ._ ° 2139 ° a. r' ®INT WALL 2129 , 2130 1 '`2123 ' = - - =--�- - . _ 138 o@INT WALL x x @INT WALL 21.00' W C�PORCli 2 -s W \\''i 2122 DINT WALL 2142 6.00' —~ Q 0, ©BC x ®INT WALL 2131 --x ®INT WALL o 2114 BC a_ 2124 ®BC x 21 l 2132 Z ®PORCH 5.00' ®INT 40 WALL '— @INT WALL "' W ,� Z �W 7--) 6.00 x 2115 0 2119 • ®BC M ' 0 2125 @BC 2120 r 2133 X >< 2 INT WALL ®PORCH 4.00' @BC 2137 -2141 2116 Q I / \ ,• C�INT WALL ®INT WALL 2134 @BC o ' ' O t 1 ; i @INT WALL o . „, _ . „,, - - 2126 -o Y o 5 k. @PORCH ° - Qo 5. 1 594 , k 2118 - ' ' I ; 7 , • I ` ., CALC 212 1 7, 1 x ®BC X 50.00' ; + ,^ 2117 @PORCH 21 ®INT WALL 21!35 ABC (. @INT WALL ° o ; ,= x , 599 �� _ , 59 3 1 >. I CALC CALC I Il :, „ . ,- , ' 2106.1 24.00' 2096 1 I !, �PORCfi, 2095 I 35.00 I ®BC ' �f { ' n ,,< .„ fT s e� ' .. - / , —, h-1- mac. s C' � -�--�k It • . - No L . • - 1J .. c.0 +.``t 4.'"Y6 2- 1'P 4.4-e. ,.. �- � _ °'?�