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Home My WebLink AboutPermit Geo-Tech Report 2007-5-15 ";;', {-.. -a ":. C ct /7---/! / K & A Engineering, Inc. 3327 Roanoke Ave".Eugene, OR 9.7408 (541) 684-9399 Voice (541) 684-9358 FAX E'nginE'E'ring May 15, 2007 Project: 151.06 Hayden Enterprises, Inc, 2464 SW Glacier Drive #110 Redmond, OR 97756 Subject: Jasper Meadows subdivision--Lot 213 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 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 in the new "Jasper Meadows" subdivision. The lot is mostly level and there are no apparent siope movement hazards. Foundation preparation involved construciing a level foundation pad on native undisturbed soils, This required excavating and removing approximately 12 to 24-inches of loose organic sill.and undocumented fill from the foundation pad area, After the excavation and removal of these soils, approximately 12-inches of 3;4-inch minus dense graded crushed aggregate was placed and compacted. over 3,0 to 5,0-feet of 8-inch minus "pit run" fill. This served to provide a uniform surface for footing construction, The fill materials were placed and then compacted using 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 Qetermined by ASTM 0698, The field test resuits 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 bearon undisturbed native silts a minimum depth of 36-inches beiow final grade around the perimeter foundation, The prepared foundation pad meets these recommendations, ' 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, HT. K & A Engineering, lnc, EXPIRES IOFr.' 3 0 D . Revised on 11/19/07 due to the platted lotnumbers being different than the design lot numbers, Ciient: Hayden Enterprises Jasper Meadows-Lot 213, Springfield, OR Project: 151.06 Page'2 of 2 June 21, 2007 -': ;' ':. Density of Soil and Soil-Aggregates In-Place ASTM D2922 and D3017 I Project: 151,06 I Site Address: Jasper Meadows--Lot 213 I Permit No: I Date: 5/16/2007 I lJensity TestType ': OT-6 I Operalor:ISS I Material Type:!3/4" (-) from Springfield Quarry I Maximum Dry Denstiy. pctl128,0 I Standardization and Reference Check/t. Density (Standard lJeviationsl (S,D.) 1.65 it. Moisture, I ' (S.D:) 1.49 Moist Dry lJensity, lJensity, Water Compaction, Test No, pet pct Content, % % Remarks 1 131,8 I 124.9 I 5.5 97.6% I I 2 1269 'I 119.4 I 6.3 93.3% I I 3 129.8 I 121.4 I 6.9 94,9% I I I I I I I I I I I 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 I J I I I j I I I I I I J I I I J I I I J i I I I Average: 95,2% Std, Dev,: 2.19% 1 Direct Transmission (OT) (specify depth, in.) or Air Gap Backscatter (AGB) (specifiY(T)ouchabJe 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