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Home My WebLink AboutPermit Field Test & Inspection Report 2004-9-20 SIP-20-2004 a2:91pm Frcm-K & A En.lneerin.. Inc \2031 Oc~iCl-lI] +541-884-9358 T-735 r 002/007 F-952 a ,ngln'IHfng K I A Engineering, Inc. p ,0. BOI28624, Eugene. OR 87a 521 Mlrtret IL, Suite II. Eugene. OR 17. (&41) 18..... Voice (141) 184-_ FAX september 28, 2fJ04 Hayden Homes 2464 5W Glacter Place, suite 110 Redmond, OR gn58 Subject: Quality assurance - house foundallon pad construation Jasper Meadows Subdivision - ~ Addition Sprfngfl8ldj Oregon Pmject 74.04 PURPOSE AND SCOPE AsI'8qU88l8d. K & A Engineering, Inc, has complet8cl monitoring ltJe construction of IndMduaf foundation pads at the subject new residantlalS1Jb(!M8Ion, 39 indMdual foundation pads were cwtructsd at the she and prepared ready for forming new foundatfons. Prior to con&truotion, a Geotechnlcallnvmlgation' was made of the subdivision to develop specific racommsndatlons for developing the slt810r IIsldentI8I founpatlonsr~' anti UUlltl88. The purpose Of our IIlVices was to provide monftOr construcUon of foundallon padS to 8S&lJrU that corwtruution crlt8rla outlined In the g80t8chn1caJ Investigation was addre8aed. . ThIs report documents foundation pad construction and makes recommendationa for suitability for residential foundation constructIOn, FOUNDAllON PAD EXCAVAnoN Genn The foundlliOl'l pads developed for this project are to support conventionally framed residential atructuI'88 supported by conventional cast.Jn-place conCRltD SprBad footings. Due to 1he slope Dr tI18 SIt8 most or ttJ8 foundation pads were COIl$lJUCted In two or moJ1 benohes, separated In grade by approximately 1 to 2-feet. , Found8dOII saill 1l1e GaoteCtInlcaIlnVe8tlgaUon (Boh) had predicted that hIgh plasticity "Its or clays would underU! the site. Excavation for the pada conflnned 1hat ill most of Ihe foundation pads, 1I1ere was 1 to 3-feet of a gray, hlghfy plutlc, modllral8ly atIff. and moist sill In some loCations the gray 8I~ contained a slgnlftcant amount of sub- rounded Ign80UB cobbte$. ThIs silt was orten covered by O.6-to i.D-feet of damp, very 1ow..(Jens1ty peaty siltS. Weathered )'IIIOw-tan tuffaoeous siltstone or sandstone was encounterod underneath the plastic silts. 1 BOlte AsaOc_ Ine" G8CJIeChnlcal MsIgaIIon for lie Jasper Meadows Sec:ClIId Addititrl, Springfield. Oraoon. FtbIUary 16. 2003, 8 'd l8L9'oN S3~OH N30AVH ~dH:l 900l 'g 'uBf Sep-20-2D04 02:31pm From-K I A En,lnBerlni, Inc. +541-684-936& T-735 P 0091007 F-9S2 K & A Engineering, Inc. The gray plastic slits and gray plastlc tlllte with oobbles were deepest through the western portion 011118 subdivision. Isolated zen68 of gmy plastic silt Dr plastic siR with cobbles were also encountered throughout the central and ea.stern portions at the eubdMsJon. ' faunaliaB Pad GOIIdrllcllon Because Ute depth and lDd;8J1l of soDs varied significantly across the subdlv~lQn, .,aoh pad was evaluated IndlYlduaJly to determine the proper depth of excavation and the amount 01 select fin to be placed in the excavation. For many (If 1h~ foundaliQn pads, the depth to weathel'!d slRstone or sandstone was less than 2..feet and, In these casas. the fDundation pads were excavated to bedtOCk, and graded smooth, JeveI. and free from loose materfals. In owl cases the base or the excavation was in two benches separated in grade from 1 to 2.feet. Select aranular fiI WIS placed In tile prepared excavation and brought to footing grade. In those al!a of deeper gray plastic sl, the silts were removed to a mInimum depth of 1 &-inch88 billow fooUnu grade. The battolT1$ of the excavations were graded smooth, level, and free from loose materials. In most cases 1he base of the excavation was In two benches separated In grade from 1 to 2-fael Select granular fin was placed in tho ptttpat'Qd excavation and brwght 10 footing grade. In' aU ca5e$ wtm peaty slits were encountered, the peaty-sills were complelely remavad frOm th9 foundation anl8. .... 8I'InUIar FilII Select granular fills consisted of a sub-base matertaJ and a baSe material. The ~basD material was placed on the preparId subgrade in the foundatton pads and con9fst8d of a S-Inch minus Wlu.grad8d quany aool1OatB. 1be bQe mat8rIaI was placed ever the sub-l>ase rock and consl8tBd Df a 11klnph minus denae-oraded quany aggragate. Bo1h aggl1Q8te8 were produced at the Morse Bros. Quarry In Sprlngtleld. Tll& aub-baSG thIOICn8U generallY ranged from 610 12-inch88. Base rock ranged from 4 to 12-inches In 1htc1cn88a. In a fvw aues (IOt8 33 thrvugh 39) the sub-ba8e rock was elimInated and base rock was used exclUslv8Iy for1he u/ect granular flU. The select aranular fills were well compacted in 12-inch "\llu'~'IUm lifts (loose) using a ste8l-wheeled VIbratory roller. Water was applied 88 n8C1l8S8ry to maintain optImUm water content during compaction. DenIIIy If 811eCl8rlnu1ar filla SlJb.base The denstty of the sub-base was MIuatBd by InSpection CJf placement: metI10ds and fleld evaluatfon of water content. The denslly was considered adequate If passes by the large vibratory 8tael-drum roller dld not 11M vls1b1e markS In the SUb-ba&e BUll' ,,'.,c.lB at tI18 edges of the drum BJ1d if the soil walor cormmt appeared to be near optimum as d8termIned In the field. II Z SqUH2Ing a small amount of lie ftn8r aaDnlDatB in the hand did not produce sianfficant free water and WClIld r8I11iIIn In a rellliYeJy uniform ball wtJ1aut irnm8dIately failIng apart. ProjeCt 74.04 Jasper Meadows Subdivision Phase II, Spr1ngfield, OR Cliant Hayden Homes Page2of3 S8ptemb8l' 20, 2004 V 'd Z8L9'oN S3~OH N30AVH ~dgv:Z 900Z 'g 'uer