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Home My WebLink AboutPermit Geo-Tech Report 2007-3-1 v , IV ....-: ~i ""j~;::;" '. IJ. . ",?@--/;,.~/ ~ 1Jf\ "iJ""';:-';':'/~" L 4/ rCI "i ,} /"-\" ~ , ''ii:f'"'' , . , ' ~ .; ~ K & A Engineering, Inc. 3327 Roanoke Ave., Eugene, OR 97408 (541) 684-9399 Voice (541) 684-9358 FAX ,'~;'" .~--, .~ .r. -i- -'............ '. I":"~ :-":"'+~'P"~; March 1, 2007 - - "" Project: 151.06 Hayden' Enterprises, Inc, 2464 SIN Glacier Drive #110 Redmond, OR 97756 j .1i .. ' ~ Subjecl:';Jasper Meadows subdivision--Lot 202 ..... Sp[.iifYjiel,d, OR Foun'dation Soils PURPOSE AND SCOPE , At your request, K & A Engineering, Inc. has completed a geotechnical investigation of the existing soils on the subject p'r'operly. 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 ....', ,'siructure, 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 residentiai lot on the north side of Cinder S1. in the new "Jasper Meadows" subdivision, The lot is level and there are no apparent slope movement hazards. , . Bas'ed,on the foundation pad excavation; soils consist of approXimately 25-inches of dark brown, loose, organic silts, over moist, tan, decomposed sandstone, Foundation preparation involved constructing a ievel foundation pad on native undisturbed soils. This required stripping and removing approximately 25-inches of loose silts in the foundation pad area, After the excavation and removal of the unsuitable soils, approximately 12 to 18-inches of 8-inch minus crushed quariy "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 surtace for footing construction, The fill materials were piaced 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 inspected the placement of the 8-inch minus crushed quarry "piHun" and the 3j.,-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 of the compaction effort, .,. .:!' \ K & A Engineering, Inc, We tested the in-place density of the crushed aggregate .fili 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 RECOMMENDATlON~ 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 01 theloimdatirin pad, as constructed, by the building ollicial, Thank you for the opportunity to be of service, Please call us if you have questions or need further assistance. Respectfully, ~y Steve Schultz, EJ T. K & A Engineering, Inc, EXPiRES -D1=r.' :-\ 0 2000 . Revised on 11/19/07 due to the platted iot numbers being different than the design lot numbers, : Client: Hayden Enterprises .' Jasper Meadows~Lot 202, Springfield, OR Project: 151,06 Page 2 of 2 March 1, 2007 Density of Soil and Soil-Aggregates In-Place ASTM 02922 and 03017 Project: 151.06 Site Address: Jasper Meadows--Lot 202 Permit No: Date:, 12/23/2007 Density Test Type':IDT-6 Operator:ISS Material Type:13/4" (-) from Springfield Quarry I Maximum Dry Denstiy, pCf1128,0 I Standardization and Reference Checkl~ Density I (Standard Deviations) (S:D,) 1,66 I~ Moisture, I (S.D:) .. 0,9 Moist Dry' Density, Density, Waler Compaction, TestNo, pct pct Content, % % Remarks I 1 134,0 I 127,3 1 5.3 99,5% I J I 2 133,6 I 125,0 I 6,8 97.7% I I I 3 136.9 I 127,7 ! 7,1 I 99,8% 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 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 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 Average: 99.0% Std, Dev,: 1,14% 1 DirectTransmission (DT) (specify depth, in,) or Air Gap Backscatter (AG?) (specifiy(T)ouchableor (U)ntouchable mo~ ' Testperformed using Seaman Nuclear Corp model C-300, SN,21113 Client: Hayden Enterprises, Inc, Project: 151.06 K & A-Engineering, Inc, 11/19/2007