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Home My WebLink AboutPermit Geo-Tech Report 2007-4-3 . . .a ,~ o It tC6' \ !j " 0- !rJ 0 .f K & A Engineering, Inc, 3327 Roanoke Ave., Eugene, OR 97408 (541) 68479399 Voice (541) 684-9358 FAX engineering April 3, 2007 Project: 151.06 Hayden Enterprises, Inc, 2464 SW Glacier Drive #110 Redmond, OR 97756 \ Subject: Jasper Meadows subdivision--Lot 222 Springfield, OR Foulidation Soils PURPOSE AND SCOPE At your request, 'K & A Engineering, Inc. has completed a geotechnical investigation of the existing soils on the subject property. Our understanding is that a wood-framed single-family residence supported by a cast-in- place concrete spread footing foundation is proposed for construction on this site, The purpose of our investigation was to determine the suitability of the soils for construction of the proposed structure, and provide recommendations for construction of the foundation, The scope of our services is limited to general suitability with respect to bearing capacity and expansive soils. FOUNDATION PAD PREPARATION The project site is located on a residential lot on the east side of 58th St. in the new "Jasper Meadows" subdivision. The lot is mostly level and there are no apparent slope movement hazards. Based on the foundation pad excavation, soils cpnsist of approximately 12-inches of dark brown, loose, organic silt, over 17 -inches of gray, saturated, plastic silts and black decomposing organic silt, over saturated, tan, moderately stiff, weathered and decomposed sandstone. Foundation preparation involved constructing a level foundation pad on native undisturbed soils, This required excavating and removing approximately 29-inches of loose sUt, plastic silt, and decomposing organic silt from. the foundation pad area, After the excavation and removal of these soils, approximately 30-inches of 'I.-inch minus dense graded crushed aggregate was placed and compacted, This served to provide a uniform surface for footing construction. The fill materials were placed in maximum lifts of 12-inches and cOmpacted USing a vibratory steel drum roller. We inspected the foundation pad excavation, prior to placement of the granular fills, We tested the in-place density of the crushed aggregate fill and have determined that the average dry density exceeds 95% of maximum as determined by ASTM 0698, The field test results are attached to this report. K & A Engineering, Inc. SUMMARY AND RECOMMENDATIONS The project site, as prepared, is suitable to support the proposed foundations, We recommend a design allowable bearing capacity of 2,500"pounds per square foot. The soils present a moderate shrink/swell hazard. Foundation loads should bear on undisturbed native silts a minimum depth of 3D-inches below final grade around the perimeter foundation, The prepared foundation pad meets these requirements, Final grading around the foundation pad should raise the grade above the foundation using native or imported. silts and should slope away from the foundation, . We recommend approval of the foundation pad, as constructed, by the building official, Thank you for the opportunity to be of service, Please call us if you have questions or need furtherassistance, Respectfully, . Steve Schultz, EJT. K & A Engineering, Inc, EXPIRES . E}E~:~' :0 u lfJUtl . Revised on 11/19/07 due to the platted lot numbers being different than the design lot numbers, Client: Hayden Enterprises Jasper Meadows-Lot 222, Springfield, OR Project: 151,06 Page 2 of 2 April 3, 2007 . " Density 01 Soil and Soil-Aggregates In-Place ASTM D2922 and D3017 Project I 151.06 1 Site Address: IJasper Meadows"'Lot 222 1 Permit No: I 1 Date: 14/3/2007 Density Test Type': IpT-6 1 1 Dperator:,SS Material Type:,3/4" (-J trom Springfield Quarry .Maximum Dry Denstiy, pcfl128,0 1 I Standardization and Reference Chec~t. Density I t. Moisture, I' (Standard Deviations) (S,D,) 0,93 (S,D:) 0,94 Moisl Dry Density, Density, Water Compaction; Test No, pcl pcf Content, % % Remarks I 1 134.3 I 129.1 I 4.0 I 100.9% I j I 2 138.4 I 131,6 I 5,1 I 102,8% -I j I 3 134.9 I 129.0 I 4.6 I 100.8% I j I I I I I j I 1 I I I j I I I I I I J I I I I I I I I I I I I I ... I I I I I I I I I I I I j I I I I j I I I I I I I I I j I I I I 1 I I I I j I I I I I I I I ! I I I I j I I I I J I I I I Average: . 101.5% Std, Dev,: 1,15% , Direct Transmission (DT) (specify depth, in.) or Air Gap Backscatter (AGB) (specifiy(T)ouchable or (U)ntouchable mode Test performed using Seaman Nuclear Corp model C-300, SN 21113 Client: Hayden Enterprises, Inc, Project: '151.06 . K & A Engineering, Inc. 11/19/2007' .