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Home My WebLink AboutPermit Geo-Tech Report 2007-2-23 c..B-OO 18'L v" ~~ ,. ~..,!, .a K & A Engineering, Inc. 3327 Roanoke Ave" Eugene, OR 97408 (541) 684-9399 Voice (541) 684-9358 FAX , f'nginf'f'ring February 23, 2007 Project:'151.06 Hayden Enterprises, Inc, 2464 SW Glacier Drive #110 Redmond, OR 97756 SUbject: Jasper Meadows subdivision--Lot 208 Springfield, OR Foundation 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 oUhe 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 corner of Ginder S1. and 58th S1. on the south side of Ginder St. in the new "Jasper Meadows" subdivision. The lot is level and there are no apparent slope movement hazards, The site is in a traditionally low-lying area that is being raised to an elevation even with the surrounding subdivision, Based on the foundation pad excavation, soils consist of approximately 21-inches of wet, dark brown loose silts, over saturated, dense, decomposed sandstone, . Foundation preparation involved constructing a ievel foundation pad on native undisturbed soils. This required stripping and removing approximately 18 to 35-inches of loose silts and undocumented fill in the foundation pad area. After the excavation and removal of the unsuitable soils, approximately 48 to 50-inches of 8-inch minus crushed quany "pit run" was placed and compacted on the foundation pad area, followed by 12-inches of%- inch minus dense graded crushed aggregate, 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 granuiar fills. We witnessed placement of the a-inch minus crushed quarry "pit-run" and the %-inch minus dense-graded crushed aggregate, The "pit-run" was too large to test for maximum dry density and optimum water content by conventional laboratory testing, therefore, 'adequate compaction was determined in the field by visual inspection 'i~.t~~', ..._". ,0> K & A Engineering, Inc. of the compaction effort, The "piHun" was placed in 12-inch maximum lifts and compacted with a vibratory steel drum roller, 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 D698, The field test results are attached to this report. 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 36-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 further assistance. Respectfully, Steve Schultz, E.Ll K & A Engineering, Inc, EXPIRES DEe' 3 (} 200e . Revised on 11/19/07 due to the'platted lot numbers being different than the design lot numbers. Client: Hayden Enterprises Jasper Meadows-Lot 208, Springfield, OR Project: 15106 Page 2 of 2 February 23, 2007 a.' to .... Density of Soil and Soil-Aggregates In-Place ASTM 02922 and 03017 I I Project: 151.06 I I Site Address: Jasper Meadows--Lot 208 . I I Permit No: I ' I Date: 2/9/2007 I I Density TeslType':IOT-6 I I Operator:ISS I I Material Type:13/4" (-) from SpringfieldOuarry I Maximum Dry Denstiy, pC11128,0 1 Standardizationland Reference Checkl6 D.e. nsity (Standard Deviations) (S.D,) 1,6 I 16 Moisture, I (S,D:) 0,15 Moisl' Dry' Density, . Density, Water Compaction, Tes! No. pel pel Content, % % Remarks 1, 1138.5 134,1 I 3,3 104,8% 2 1134,5 128,7 I 4,5 100.5% 3 I 1129,5 125,3 I 3.4 97.9% I I I I I I I I I I I I I I J I I I' I ) I I I I j I I I I I , , J I i I J I I I I I J I I I I I I I I I I I I I I I I Average: 101,1% Std. Oev.: 3.47% 1 Direct Transmission (OT) (specify depth, in) or Air Gap Backscatter (AGB) (specifiy(T)ouchable'or (U)ntouchable mode Test pertormed lusing Seaman Nuclear Corp model C-300, SN 21113 I Client: Hayden EnterpriJes, Inc. Project: 151,06 K & A Engineering, Inc, 11/19/2007