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Home My WebLink AboutPermit Field Test & Inspection Report 2004-9-20 S,p-2D-20D4 a2:Slpm Frgm-K & A Enfineerlni. Ine \QCJl3 ~ero L (!k +541-884-9350 T-795 P 002/007 F-952 .a fngln.erlng K I A ERfineerlng, Inc. P.O. B11128G24, E.....' OR 87402 621 MIrbI IL, Suite B. Eagen. OR 17. (&41) ....... VoIc. (141) 184-8368 FAX 8eptember 21, 2804 Hayden Homes 2464 SWGlacler Place, SuIte 110 Redmond, OR 97758 Subject Duality assurance - house foundatlon pad construotion Jasper Meadows Subdivision - ~ Addition Springfl8ld. Oregon PmjlIcI: 74.04 PURPOSE AND SCOPE As 1'8qU98t8d, K & A Engineering. Inc, has completsd monitoring the coostrucUon of Individual foundation pads at the subject new residantlalsUbdMalon. 39 indMdual foundation pads were construct8d at 1he site and prepared ready for forming new foundaUon$. Prior to construotion, a Geotechnlcallnvmlgation' was made of the subdivision to develop specific recommsnclatlons for developlng the 6lt8 for rllkJtntlal fou~atIons,~, and UUlJtJas. The purpose Of our III1'Vice8 was to provkle monitor construcUon of foundation padS to assure that c:onmmtion crbrla outlined In the g80f8c1m1caJ Investigation was addresaed. . 11118 report documents foundatlan pad construction and makes reoammen4ati0n8 for suitability for residential foundaUon constructIOn. FOUNDAllON PAD EXCAVAnGN GIJJIII'II The foundation pads d6vefoped for this project are to support convenUonally framed residllntial atnJctur88 supported by conventlonal cast-ln-pl8ce cencrum Spr1!ad footings. Due to 1he slope or tI18 SIt8 most of the foundation pads were constructed In two or mort benches, 88par1ted In grade by appraxil't1ltely 1 to 2-feet. FoundIdon hill 11Ie aeotechnlcallnv8atlgatlon (BoIre) had predicted that high plasticity silts or clays would underlie the site. Fxcavatlon for the pad8 confirmed that in most of the foundation pads, tftere was 1 to 3-feet of a gray. highly pladc, modllral8ly stiff. and moist sill In some locations the gray 81~ contained a significant amount of sub- rounded Ign8OU8 cabbte$. 111Is silt was artsn covered by O.&.to 1.Q.feet of damp, very low..f1ens1ty peaty siltS. Wea!hered )'Blow-tan tuffaceous siltstone or sandstone was encounl8t'OO underneath the plastic silts. 1 BOIre AsaOcIafBs, Inc.. Gt.,;,;.;' .nIcaI MsIgaIIon for lie Jasper Meadows Second AdditiCl'l, Springfield, Oregon, rtbnJary 16. 2003. ' 8 'd l8L9'oN S3~OH N30AVH ~dH:l 900l 'g 'uer Sep-ZO-2004 02:31pm Frgm-K & A EnSlneerlni. Inc. +541-694-0368 T-735 P OD9/007 F-952 K & A Elglneering, Inc. The gray plastic slits and gray plastic llllte with oobblea were deepest through Ihe western porlfon al1he subdivision. IsoIat8d ames of gmy plastlo sltt or plastic silt with cobbles wtI/1 also encountered throughout the central and eastern portions or the wbdMslon. fDlDluliall hd GOIIdrucllon Because !he depth and ment of solis varied significantly across the subdlvlel(m, ~Dh pad was ~a1uat8d IndIVIduallY to d8term1ne the proper depth of excavation and the amount 01 &elect 1In to be placed in the excavation. For many {If ~ foundatiOn pad8, the depth to weathered slRstone or sandstone was less than 2..feet and, fn these cases, the foundatiOn pads were excavated to bedtOCk, and gl'1did smooth, level. and free from loose materfals. In ~ casas the base or the excavation was in two benches separated in grade from 1 to 2.feet. select granular fill WIS placed In the prepared excavation and brought 10 footing grade. In those at!aS of deeper gray plastic sBt, the sifts ware removed to a minimum depth of 1 &-inch08 below footing grade. The battoms of the excavations were grBded smooth, level, and free from loose materials. In most cases the base of tho excavatfon was In two benches separated In grade from 1 to 2-f8et Select granular no was placed in the ptttparQd 8lmaVItIon and brcwght to footing grade. In aU cases where peaty sllta were encountered, the peaty-sills were completely remavad frOm the fDundatlon area. IlItot 8rInUIar FilII Select granular fills consisted of a sub-base mater1al and a Dase matertaI. The SIJb.obue material was placed on 1he prepared subgrade in the foundatton pads and con9IstDd 01' a S-lnch minus waU.grad8d quany aQOraoatB. The bQ8 mater1al was plaCed over the stJb-l>ase rock and consl8t8d at a 1 *lnpt! minus densellraded quarry aggregate. Bo1h aggreoatea wert produced at the Morse Bros. Quarry In Sprlngfteld. ThO stJb.base ttioItnIU generally ranged 1rom 6 to 12-inch88, Base rock ranged from 4 to 12..tnches In 1hfckne88, In a fvw aues (late 33 through 39) the sub-ba8e rock was elimInated and base rock was used excluslv8ly forthe uIect granular flU. The select granular filla were well compacted in 12.inch mmdmum lifts (loose) using a steel-Whe8led vlb. ~t I roller. Water was applied 88 necessary to maintain optlmUm water content during compaction. DInIIty If 811eclBrHular fills SUb-base The denstty of the sub-base was evaIUatBd by InSpection of placement methods and fleld evaluaUon of water contmt. The denslly was considered adequate If passes by the large vibratory 8ts8kIrum roller did not IBM Visible marIeS In the sub-base agg~ at th8 edges of the drmn Bnd if the soil water cormmt appeared to be near optimum 88 d8termIned In the field. a 2 Squee2Ina a smaIJ amount of lie nner lIOIJJ8lJlIl8 in the hand did not produce silJRffi1:ant free watllr and would remain In a , L,ll~;'I;'Jy uniform ~ witIout immediately falling apart. PrOject 74.04 Jasper Meadows Subdivision PhI8e II, Springfield, OR alent Hayden Homes Page20fS september 20, 2004 t 'd lU9'oN S3~OH N30AVH ~dSt:l SOO,l 'S 'uer